EP3680368A1 - Method for preparing hollow fiber composite - Google Patents
Method for preparing hollow fiber composite Download PDFInfo
- Publication number
- EP3680368A1 EP3680368A1 EP18854486.0A EP18854486A EP3680368A1 EP 3680368 A1 EP3680368 A1 EP 3680368A1 EP 18854486 A EP18854486 A EP 18854486A EP 3680368 A1 EP3680368 A1 EP 3680368A1
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- European Patent Office
- Prior art keywords
- polymer fiber
- catalyst
- polymer
- fiber
- precursor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002131 composite material Substances 0.000 title claims abstract description 103
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 49
- 229920005594 polymer fiber Polymers 0.000 claims abstract description 139
- 239000003054 catalyst Substances 0.000 claims abstract description 60
- 239000002243 precursor Substances 0.000 claims abstract description 54
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 48
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 42
- 239000000835 fiber Substances 0.000 claims description 37
- 239000004202 carbamide Substances 0.000 claims description 24
- 229920000642 polymer Polymers 0.000 claims description 16
- 239000000853 adhesive Substances 0.000 claims description 14
- 230000001070 adhesive effect Effects 0.000 claims description 13
- 230000008602 contraction Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000002121 nanofiber Substances 0.000 description 33
- 230000000052 comparative effect Effects 0.000 description 13
- 238000001523 electrospinning Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 239000011941 photocatalyst Substances 0.000 description 3
- 230000000243 photosynthetic effect Effects 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- 230000000181 anti-adherent effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002134 carbon nanofiber Substances 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002649 leather substitute Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F11/00—Chemical after-treatment of artificial filaments or the like during manufacture
- D01F11/04—Chemical after-treatment of artificial filaments or the like during manufacture of synthetic polymers
- D01F11/06—Chemical after-treatment of artificial filaments or the like during manufacture of synthetic polymers of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
- D06M13/402—Amides imides, sulfamic acids
- D06M13/432—Urea, thiourea or derivatives thereof, e.g. biurets; Urea-inclusion compounds; Dicyanamides; Carbodiimides; Guanidines, e.g. dicyandiamides
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
- D01D5/247—Discontinuous hollow structure or microporous structure
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/28—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F6/38—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising unsaturated nitriles as the major constituent
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/26—Polymers or copolymers of unsaturated carboxylic acids or derivatives thereof
- D06M2101/28—Acrylonitrile; Methacrylonitrile
Definitions
- the present invention relates to a method for preparing a hollow fiber composite, and more particularly to a method for preparing a hollow fiber composite including heat-treating a polymer fiber provided with a precursor.
- a nanofiber may be defined as a fibrous material having a diameter of less than 1 ⁇ m and may be prepared by various methods such as phase separation, self-assembly, chemical vapor disposition (CVD), electrospinning or the like.
- CVD chemical vapor disposition
- electrospinning is most effective in terms of convenient preparation or mass production and applicability of final products.
- the electrospinning is a method for preparing a fibrous material having a diameter of less than 1 ⁇ m into a web or three-dimensional non-woven fabric by applying a high-voltage electric field to a polymer solution.
- the nanofiber prepared as above may be used for purposes such as a filter material for air or water purification, a medical anti-adhesive agent, a dressing material, a wiping cloth, a carbon nanofiber for artificial leather and energy storage, an inorganic nanofiber by organic/inorganic mixed spinning, etc., and thus various nanofiber-related technologies have been developed.
- Korean Unexamined Patent Publication No. 10-2011-0110643 (Application No.: 10-2010-0030090 and applicant: University-Industry Cooperation Group of Kyung Hee University) discloses a method for preparing a metal-coated nanofiber, including a) preparing an electrospinning solution containing a polymer with a fiber forming ability and an electroless plating catalyst, b) preparing a nanofiber having a diameter of 10 nm to 5 ⁇ m by electrospinning the electrospinning solution, and c) electrolessly plating the nanofiber.
- various nanofiber-related technologies have been developed now.
- One technical object of the present invention is to provide a method for preparing a hollow fiber composite with an improved surface area.
- Another technical object of the present invention is to provide a method for preparing a hollow fiber composite with an improved content of a catalyst.
- Still another technical object of the present invention is to provide a method for preparing a hollow fiber composite, which may be applied to various applications.
- the present invention provides a method for preparing a hollow fiber composite.
- the method for preparing a hollow fiber composite includes preparing a polymer fiber, providing a precursor containing nitrogen onto the polymer fiber, and heat-treating the polymer fiber provided with the precursor, in which the precursor is heat-treated to be converted into a catalyst and the polymer fiber is heat-treated to have cavities formed therein.
- an adhesive strength between the catalyst and the polymer fiber may be enhanced so that the catalyst may be allowed to fix an outer wall of the polymer fiber, and the polymer fiber may be contracted toward the outer wall from a center of diameter of the polymer fiber so that cavities are formed within the polymer fiber, in which the adhesive strength between the catalyst and the polymer fiber may be stronger than a contraction force of the polymer fiber.
- the providing of the precursor containing nitrogen onto the polymer fiber may be performed by a method of immersing the polymer fiber into a solution containing the precursor, and the catalyst may be provided onto the polymer fiber in a form of particle or layer depending on a ratio of a weight of the precursor to a weight of the polymer fiber.
- the polymer fiber provided with the precursor may be heat-treated at a temperature of 580 °C or above and less than a temperature at which the polymer is carbonized.
- an amount of the precursor permeating into the polymer fiber may be increased as a thickness of the polymer fiber is decreased.
- the polymer may include polyacrylo nitrile (PAN).
- PAN polyacrylo nitrile
- the precursor may include urea.
- the catalyst may include g-C 3 N 4 .
- the method for preparing a hollow fiber composite includes preparing a fiber composite including a precursor containing nitrogen and provided onto a surface of a polymer fiber, and heat-treating the fiber composite, in which, as the fiber composite is heat-treated, the precursor is converted into a catalyst, an adhesive strength between the catalyst and the polymer fiber is enhanced so that the catalyst is allowed to fix an outer wall of the polymer fiber, and the polymer fiber is contracted toward the outer wall from a center of diameter of the polymer fiber so that cavities are formed within the polymer fiber.
- the adhesive strength between the polymer fiber and the catalyst may be stronger than a contraction force of the polymer fiber.
- the catalyst may be provided onto the surface of the polymer fiber in a form of particle or layer.
- the polymer may include polyacrylo nitrile (PAN) and the catalyst may include g-C 3 N 4 .
- PAN polyacrylo nitrile
- the catalyst may include g-C 3 N 4 .
- the catalyst may be formed prior to the cavities within the polymer fiber.
- the method for preparing a hollow fiber composite according to an embodiment of the present invention may include preparing a polymer fiber, providing a precursor containing nitrogen onto the polymer fiber, and heat-treating the polymer fiber provided with the precursor.
- the precursor may be converted into a catalyst, and an adhesive strength between the catalyst and the polymer fiber may be enhanced, so that the catalyst may be allowed to fix an outer wall of the polymer fiber.
- the polymer fiber may be contracted toward the outer wall from a center of diameter of the polymer fiber, so that cavities may be formed within the polymer fiber.
- the hollow fiber composite may be used as an artificial photosynthetic material, a photocatalyst responding to light, etc., depending on a type of the catalyst, and may be also used as a material which carries out reduction of contaminants such as carbon dioxide.
- the hollow fiber composite may be also used as a composite material, a conductive polymer composite material, a photoelectrochemical water-splitting material, etc., which are used in an electrode material with an improved rate of ionic adsorption, a gas sensor with an improved rate of gas adsorption, an energy storage, and a radiator panel of aircrafts, cars, etc.
- first element When it is mentioned in the specification that one element is on another element, it means that the first element may be directly formed on the second element or a third element may be interposed between the first element and the second element. Further, in the drawings, the thicknesses of the membrane and areas are exaggerated for efficient description of the technical contents.
- first, second, and third are used to describe various elements, but the elements are not limited to the terms. The terms are used only to distinguish one element from another element. Accordingly, an element mentioned as a first element in one embodiment may be mentioned as a second element in another embodiment.
- the embodiments illustrated here include their complementary embodiments. Further, the term "and/or" in the specification is used to include at least one of the elements enumerated in the specification.
- FIG. 1 is a flowchart for explaining a method for preparing a hollow fiber composite according to an embodiment of the present invention
- FIGS. 2 to 4 are views showing a process of preparing a hollow fiber composite according to an embodiment of the present invention.
- a polymer fiber 100 may be prepared (S110).
- the polymer fiber 100 may be prepared by electrospinning a polymer solution.
- the polymer may include polyacrylo nitrile (PAN).
- PAN polyacrylo nitrile
- the electrospinning process may be performed through a single nozzle.
- the polymer fiber 100 may include a PAN nanofiber.
- the precursor 200a may be provided onto the polymer fiber 100 to prepare a fiber composite 300 (S120).
- the precursor 200a may contain nitrogen.
- the precursor 200a may include urea.
- the fiber composite 300 may be prepared by a method of immersing the polymer fiber 100 into a solution containing the precursor 200a.
- the fiber composite 300 may be prepared by a method of immersing a PAN fiber having a weight of 50 mg into a solution containing urea having a weight of 3 g.
- an amount of the precursor 200a permeating into the polymer 100 may be increased. Specifically, if the polymer fiber 100 is immersed into the solution containing the precursor 200a, the precursor 200a may permeate into the polymer fiber 100. In this case, an amount of the precursor 200a permeating into the polymer fiber 100 having a small thickness may be more than an amount of the precursor 200a permeating into the polymer fiber 100 having a large thickness.
- the polymer fiber 100 provided with the precursor 200a may be heat-treated (S130).
- the fiber composite 300 may be heat-treated.
- the fiber composite 300 may be disposed within a sintering device 400 and heat-treated. Accordingly, the fiber composite 300 may be subject to sintering.
- FIG. 5 is a view specifically showing a fiber composite formed in a process of preparing a hollow fiber composite according to an embodiment of the present invention
- FIG. 6 is a view for explaining that cavities are formed within a polymer fiber in a process of preparing a hollow fiber composite according to an embodiment of the present invention.
- the precursor 200a may be converted into a catalyst 200b (S140).
- the precursor 200a provided onto the polymer fiber 100 may be converted into the catalyst 200b.
- the catalyst 200b may be provided onto the polymer fiber 100.
- the catalyst 200b may include g-C 3 N 4 .
- the catalyst 200b may be provided onto the polymer fiber 100 in a form of particle.
- the catalyst 200b may be provided onto the polymer fiber 100 in a form of layer.
- the catalyst 200b may be provided onto the polymer fiber 100 in a form of particle or layer depending on a ratio of a weight of the precursor 200a to a weight of the polymer fiber 100 in the preparing of the fiber composite 300.
- the catalyst 200b may be provided onto the polymer fiber 100 in the form of layer, if the polymer fiber 100 includes a PAN fiber and the precursor 200a includes urea, and if a weight ratio between the PAN fiber and the urea exceeds 50 mg : 3 g.
- a surface of the polymer fiber 100 may have a concavo-convex shape including concave and convex portions.
- the catalyst 200b may be provided onto the plurality of concave and convex portions in a form of particle, or may be provided in a form of layer, which conformally covers the surface of the concave and convex portions.
- the fiber composite 300 may be heat-treated at a temperature of 580 °C or above and less than a temperature at which the polymer is carbonized.
- the temperature at which the polymer is carbonized may vary depending on a type of the polymer. For example, if the polymer includes PAN, the fiber composite 300 may be heat-treated at a temperature of 580 °C.
- the fiber composite 300 is heat-treated at a temperature of less than 580 °C, a contraction of the polymer fiber 100, which will be described below, may not occur, so that cavities may not be easily formed within the polymer fiber 100. Further, if the fiber composite 300 is heat-treated at a temperature, at which the polymer is carbonized, or above, the precursor 200a may not be easily converted into the catalyst 200b, so that cavities may not be easily formed within the polymer fiber 100, which will be described below.
- the catalyst 200b may fix an outer wall 100b of the polymer fiber 100 (S150). Specifically, if the fiber composite 300 is heat-treated, adhesion between the catalyst 200b and the polymer fiber 100 may be enhanced, and thus the catalyst 200b may fix the outer wall 100b of the polymer fiber 100.
- the polymer fiber 100 may be contracted to form cavities 100h within the polymer fiber 100.
- the polymer fiber 100 may be contracted toward the outer wall 100b of the polymer fiber 100 from a center 100a of diameter of the polymer fiber 100.
- the adhesive strength between the polymer fiber 100 and the catalyst 200b may be stronger than a contraction force of the polymer fiber 100. Accordingly, the cavities 100h may be formed within the polymer fiber 100.
- the precursor 200a provided onto the polymer fiber 100 may be converted into the catalyst 200b and the adhesive strength between the catalyst 200b and the polymer fiber 100 may become strong. Further, as the polymer fiber 100 is heat-treated, a contraction phenomenon of the polymer fiber 100 may occur.
- the polymer fiber 100 may be contracted while the outer wall 100b of the polymer fiber 100 is fixed by the catalyst 200b. Accordingly, the polymer fiber 100 may be contracted toward the outer wall 100b of the polymer fiber 100 from a center 100a of diameter of the polymer fiber, and the cavities 100h may be formed within the polymer fiber 100.
- the catalyst 200b may be provided not only onto a surface of the polymer fiber 100, but also within the cavities 100h of the polymer fiber 100. However, an amount of the catalyst 200b provided onto the surface of the polymer fiber 100 may be more than an amount of the catalyst 200b provided within the cavities 100h of the polymer fiber 100.
- the method for preparing a hollow fiber composite according to an embodiment of the present invention as described above may include preparing the polymer fiber 100, providing the precursor 200a containing nitrogen onto the polymer fiber 100, and heat-treating the polymer fiber 100 provided with the precursor 200a.
- the precursor 200a may be converted into the catalyst 200b, and the adhesive strength between the catalyst 200b and the polymer fiber 100 may be enhanced, so that the catalyst 200b may fix the outer wall 100b of the polymer fiber 100.
- the polymer fiber 100 may be contracted toward the outer wall 100b from a center 100a of diameter of the polymer fiber 100, so that the cavities 100h may be formed within the polymer fiber 100.
- the hollow fiber composite may be used as an artificial photosynthetic material, a photocatalyst responding to light, etc., depending on a type of the catalyst 200b, and may be also used as a material which carries out reduction of contaminants such as carbon dioxide.
- the hollow fiber composite may be also used as a composite material, a conductive polymer composite material, a photoelectrochemical water-splitting material, etc., which are used in an electrode material with an improved rate of ionic adsorption, a gas sensor with an improved rate of gas adsorption, an energy storage, and a radiator panel of aircrafts, cars, etc.
- a PAN nanofiber was prepared by electrospinning a polyacrylonitrile (PAN) solution through a single nozzle. After that, a fiber composite was prepared by immersing the PAN nanofiber having a weight of 50 mg into a solution containing urea having a weight of 3 g, after which the fiber composite was heat-treated at a temperature of 580 °C under an atmosphere of argon (Ar) gas, so as to prepare a hollow fiber composite according to an embodiment, in which g-C 3 N 4 was provided onto the PAN nanofiber.
- PAN polyacrylonitrile
- a PAN nanofiber was prepared by electrospinning a PAN solution.
- a carbonized PAN nanofiber was prepared by carbonizing a PAN nanofiber which was prepared by electrospinning a PAN solution through a single nozzle. After that, a fiber composite was prepared by immersing the carbonized PAN nanofiber into a solution containing urea and thiourea, after which the fiber composite was heat-treated at a temperature of 580 °C under an atmosphere of argon (Ar) gas, so as to prepare a hollow fiber composite according to an embodiment, in which g-C 3 N 4 was provided onto the carbonized PAN nanofiber.
- Ar argon
- the hollow fiber composite according to the embodiment, the nanofiber according to Comparative Example 1, and the hollow fiber composite according to Comparative Example 2 are summarized in the following Table 1.
- Table 1 Classification Structure Example PAN/g-C 3 N 4 hollow fiber composite Comparative Example 1 PAN nanofiber Comparative Example 2 Carbonized PAN/g-C 3 N 4 nanofiber composite
- FIG. 7 is a view showing pictures of a hollow fiber composite according to an embodiment of the present invention.
- the hollow fiber composite according to the embodiment was photographed through a scanning electron microscope (SEM) with magnification power of 500 nm and 5.00 um. As can be understood from (a) and (b) of FIG. 7 , it might be confirmed that the hollow fiber composite according to the embodiment has cavities formed within the fiber composite. Further, the surface area (m 2 /g) and total pore volume (cm 3 /g) properties of the hollow fiber composite, which was photographed through the SEM with reference to (a) and (b) of FIG. 7 , and the PAN nanofiber according to Comparative Example 1 are summarized in the following Table 2.
- the hollow fiber composite according to the embodiment has a surface area value about seven times more than that of the PAN nanofiber, and has a total pore volume value about 12 times more than that of the PAN nanofiber.
- the hollow fiber composite according to the embodiment, in which g-C 3 N 4 is provided onto the PAN nanofiber has excellent surface area and total pore volume properties.
- FIG. 8 is a view showing pictures of a nanofiber composite according to Comparative Example 2 of the present invention.
- a side and a surface of the nanofiber composite according to above Comparative Example 2 were photographed through a transmission electron microscope (TEM) with magnification power of 50 nm.
- TEM transmission electron microscope
- the nanofiber composite according to above Comparative Example 2 does not have cavities formed therein.
- the nanofiber composite according to above Comparative Example 2 has a carbonized PAN surface coated with g-C 3 N 4 .
- FIGS. 9 to 11 are views showing pictures of hollow fiber composites according to embodiments of the present invention, which are prepared at mutually different temperatures.
- the PAN nanofiber according to the embodiment which was immersed in urea, was heat-treated at temperatures of 300 °C, 400 °C and 580 °C to prepare hollow fiber composites, which were then photographed through the SEM respectively.
- the hollow fiber composites prepared by being heat-treated at temperatures of 300 °C and 400 °C do not have cavities formed in a part thereof.
- the hollow fiber composite prepared by being heat-treated at a temperature of 580 °C has cavities easily formed therein. Accordingly, in case of preparing the hollow fiber composite according to the embodiment, it may be seen that it is easy to heat-treat the PAN nanofiber immersed in urea at a temperature of 580 °C or above.
- FIG. 12 is a graph showing a change in properties of a hollow fiber composite according to an embodiment of the present invention depending on a concentration of urea.
- a concentration of urea was adjusted in a step of immersing a PAN fiber into a solution containing urea.
- the hollow fiber composite was prepared when there is no urea (PAN@580) and when there are 2.4 g, 3 g, 4 g and 5 g of urea, after which a transmittance (%)depending on wavenumbers (cm -1 ) was measured, and the results were shown in a graph of FT-IR (Fourier transform infrared spectroscopy).
- the hollow fiber composite (PAN@580) without urea does not show any peak and the hollow fiber composite prepared through immersion into the solution containing 2.4 g of urea shows one peak at 1200-1640 cm -1 .
- the hollow fiber composites prepared through immersion into the solutions containing 3 g, 4 g and 5 g of urea show two peaks at 1200-1640 cm -1 and 800-880 cm -1 .
- a peak related to g-C 3 N 4 may be confirmed at 1200-1640 cm -1 and 800-880 cm -1 .
- a peak is shown in the range described above.
- the hollow fiber composite prepared through immersion into the solutions containing 3 g, 4 g and 5 g of urea have g-C 3 N 4 easily formed therein.
- g-C 3 N 4 is easily formed by immersing the PAN fiber into the solution containing at least 3 g of urea.
- a hollow fiber composite according to an embodiment of the present invention and a method for preparing the same may be utilized in various fields of industry such as a photocatalyst, an artificial photosynthetic material, an electrode material, a gas sensor, an energy storage, a radiator panel, etc.
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- Artificial Filaments (AREA)
Abstract
Description
- The present invention relates to a method for preparing a hollow fiber composite, and more particularly to a method for preparing a hollow fiber composite including heat-treating a polymer fiber provided with a precursor.
- In general, a nanofiber may be defined as a fibrous material having a diameter of less than 1 µm and may be prepared by various methods such as phase separation, self-assembly, chemical vapor disposition (CVD), electrospinning or the like. However, it is known that the electrospinning is most effective in terms of convenient preparation or mass production and applicability of final products.
- The electrospinning is a method for preparing a fibrous material having a diameter of less than 1 µm into a web or three-dimensional non-woven fabric by applying a high-voltage electric field to a polymer solution. The nanofiber prepared as above may be used for purposes such as a filter material for air or water purification, a medical anti-adhesive agent, a dressing material, a wiping cloth, a carbon nanofiber for artificial leather and energy storage, an inorganic nanofiber by organic/inorganic mixed spinning, etc., and thus various nanofiber-related technologies have been developed.
- For example, Korean Unexamined Patent Publication No.
10-2011-0110643 10-2010-0030090 - One technical object of the present invention is to provide a method for preparing a hollow fiber composite with an improved surface area.
- Another technical object of the present invention is to provide a method for preparing a hollow fiber composite with an improved content of a catalyst.
- Still another technical object of the present invention is to provide a method for preparing a hollow fiber composite, which may be applied to various applications.
- The technical objects of the present invention are not limited to the above.
- To solve the above technical objects, the present invention provides a method for preparing a hollow fiber composite.
- According to one embodiment, the method for preparing a hollow fiber composite includes preparing a polymer fiber, providing a precursor containing nitrogen onto the polymer fiber, and heat-treating the polymer fiber provided with the precursor, in which the precursor is heat-treated to be converted into a catalyst and the polymer fiber is heat-treated to have cavities formed therein.
- According to one embodiment, in the method for preparing a hollow fiber composite, as the polymer fiber provided with the precursor is heat-treated, an adhesive strength between the catalyst and the polymer fiber may be enhanced so that the catalyst may be allowed to fix an outer wall of the polymer fiber, and the polymer fiber may be contracted toward the outer wall from a center of diameter of the polymer fiber so that cavities are formed within the polymer fiber, in which the adhesive strength between the catalyst and the polymer fiber may be stronger than a contraction force of the polymer fiber.
- According to one embodiment, the providing of the precursor containing nitrogen onto the polymer fiber may be performed by a method of immersing the polymer fiber into a solution containing the precursor, and the catalyst may be provided onto the polymer fiber in a form of particle or layer depending on a ratio of a weight of the precursor to a weight of the polymer fiber.
- According to one embodiment, the polymer fiber provided with the precursor may be heat-treated at a temperature of 580 °C or above and less than a temperature at which the polymer is carbonized. According to one embodiment, in the method for preparing a hollow fiber composite, an amount of the precursor permeating into the polymer fiber may be increased as a thickness of the polymer fiber is decreased.
- According to one embodiment, the polymer may include polyacrylo nitrile (PAN).
- According to one embodiment, the precursor may include urea.
- According to one embodiment, the catalyst may include g-C3N4.
- According to another embodiment, the method for preparing a hollow fiber composite includes preparing a fiber composite including a precursor containing nitrogen and provided onto a surface of a polymer fiber, and heat-treating the fiber composite, in which, as the fiber composite is heat-treated, the precursor is converted into a catalyst, an adhesive strength between the catalyst and the polymer fiber is enhanced so that the catalyst is allowed to fix an outer wall of the polymer fiber, and the polymer fiber is contracted toward the outer wall from a center of diameter of the polymer fiber so that cavities are formed within the polymer fiber.
- According to another embodiment, the adhesive strength between the polymer fiber and the catalyst may be stronger than a contraction force of the polymer fiber.
- According to another embodiment, the catalyst may be provided onto the surface of the polymer fiber in a form of particle or layer.
- According to another embodiment, the polymer may include polyacrylo nitrile (PAN) and the catalyst may include g-C3N4.
- According to another embodiment, the catalyst may be formed prior to the cavities within the polymer fiber.
- The method for preparing a hollow fiber composite according to an embodiment of the present invention may include preparing a polymer fiber, providing a precursor containing nitrogen onto the polymer fiber, and heat-treating the polymer fiber provided with the precursor.
- Further, as the polymer fiber provided with the precursor is heat-treated, the precursor may be converted into a catalyst, and an adhesive strength between the catalyst and the polymer fiber may be enhanced, so that the catalyst may be allowed to fix an outer wall of the polymer fiber. In this case, the polymer fiber may be contracted toward the outer wall from a center of diameter of the polymer fiber, so that cavities may be formed within the polymer fiber.
- Accordingly, a surface area of the polymer fiber may be increased to enhance a content of the catalyst. Further, the hollow fiber composite may be used as an artificial photosynthetic material, a photocatalyst responding to light, etc., depending on a type of the catalyst, and may be also used as a material which carries out reduction of contaminants such as carbon dioxide. Furthermore, the hollow fiber composite may be also used as a composite material, a conductive polymer composite material, a photoelectrochemical water-splitting material, etc., which are used in an electrode material with an improved rate of ionic adsorption, a gas sensor with an improved rate of gas adsorption, an energy storage, and a radiator panel of aircrafts, cars, etc.
-
-
FIG. 1 is a flowchart for explaining a method for preparing a hollow fiber composite according to an embodiment of the present invention. -
FIGS. 2 to 4 are views showing a process of preparing a hollow fiber composite according to an embodiment of the present invention. -
FIG. 5 is a view specifically showing a fiber composite formed in a process of preparing a hollow fiber composite according to an embodiment of the present invention. -
FIG. 6 is a view for explaining that cavities are formed within a polymer fiber in a process of preparing a hollow fiber composite according to an embodiment of the present invention. -
FIG. 7 is a view showing pictures of a hollow fiber composite according to an embodiment of the present invention. -
FIG. 8 is a view showing pictures of a nanofiber composite according to Comparative Example 2 of the present invention. -
FIGS. 9 to 11 are views showing pictures of hollow fiber composites according to embodiments of the present invention, which are prepared at mutually different temperatures. -
FIG. 12 is a graph showing a change in properties of a hollow fiber composite according to an embodiment of the present invention depending on a concentration of urea. - Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments, but may be realized in different forms. The embodiments introduced herein are provided to sufficiently deliver the spirit of the present invention to those skilled in the art so that the disclosed contents may become thorough and complete.
- When it is mentioned in the specification that one element is on another element, it means that the first element may be directly formed on the second element or a third element may be interposed between the first element and the second element. Further, in the drawings, the thicknesses of the membrane and areas are exaggerated for efficient description of the technical contents.
- Further, in the various embodiments of the present invention, the terms such as first, second, and third are used to describe various elements, but the elements are not limited to the terms. The terms are used only to distinguish one element from another element. Accordingly, an element mentioned as a first element in one embodiment may be mentioned as a second element in another embodiment. The embodiments illustrated here include their complementary embodiments. Further, the term "and/or" in the specification is used to include at least one of the elements enumerated in the specification.
- In the specification, the terms of a singular form may include plural forms unless otherwise specified. Further, the terms "including" and "having" are used to designate that the features, the numbers, the steps, the elements, or combination thereof described in the specification are present, and may be understood that one or more other features, numbers, step, elements, or combinations thereof may be added.
- Further, in the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unnecessarily unclear.
-
FIG. 1 is a flowchart for explaining a method for preparing a hollow fiber composite according to an embodiment of the present invention, andFIGS. 2 to 4 are views showing a process of preparing a hollow fiber composite according to an embodiment of the present invention. - Referring to
FIGS. 1 and2 , apolymer fiber 100 may be prepared (S110). According to one embodiment, thepolymer fiber 100 may be prepared by electrospinning a polymer solution. For example, the polymer may include polyacrylo nitrile (PAN). For example, the electrospinning process may be performed through a single nozzle. For example, thepolymer fiber 100 may include a PAN nanofiber. - Referring to
FIGS. 1 and3 , theprecursor 200a may be provided onto thepolymer fiber 100 to prepare a fiber composite 300 (S120). According to one embodiment, theprecursor 200a may contain nitrogen. For example, theprecursor 200a may include urea. - According to one embodiment, the
fiber composite 300 may be prepared by a method of immersing thepolymer fiber 100 into a solution containing theprecursor 200a. For example, if thepolymer fiber 100 includes PAN and theprecursor 200a includes urea, thefiber composite 300 may be prepared by a method of immersing a PAN fiber having a weight of 50 mg into a solution containing urea having a weight of 3 g. - According to one embodiment, as a thickness of the
polymer fiber 100 is decreased, an amount of theprecursor 200a permeating into thepolymer 100 may be increased. Specifically, if thepolymer fiber 100 is immersed into the solution containing theprecursor 200a, theprecursor 200a may permeate into thepolymer fiber 100. In this case, an amount of theprecursor 200a permeating into thepolymer fiber 100 having a small thickness may be more than an amount of theprecursor 200a permeating into thepolymer fiber 100 having a large thickness. - Referring to
FIGS. 1 and4 , thepolymer fiber 100 provided with theprecursor 200a may be heat-treated (S130). In other words, thefiber composite 300 may be heat-treated. According to one embodiment, thefiber composite 300 may be disposed within asintering device 400 and heat-treated. Accordingly, thefiber composite 300 may be subject to sintering. - Hereinafter, as the
fiber composite 300 is heat-treated, a process of forming cavities within thepolymer fiber 100 will be described with reference toFIGS. 1 ,5 and6 . -
FIG. 5 is a view specifically showing a fiber composite formed in a process of preparing a hollow fiber composite according to an embodiment of the present invention, andFIG. 6 is a view for explaining that cavities are formed within a polymer fiber in a process of preparing a hollow fiber composite according to an embodiment of the present invention. - Referring to
FIGS. 1 and5 , as thefiber composite 300 is heat-treated, theprecursor 200a may be converted into acatalyst 200b (S140). In other words, if thefiber composite 300 is heat-treated, theprecursor 200a provided onto thepolymer fiber 100 may be converted into thecatalyst 200b. Accordingly, thecatalyst 200b may be provided onto thepolymer fiber 100. For example, as described above, if theprecursor 200a includes urea, thecatalyst 200b may include g-C3N4. - According to one embodiment, as shown in (a) of
FIG. 5 , thecatalyst 200b may be provided onto thepolymer fiber 100 in a form of particle. According to another embodiment, as shown in (b) ofFIG. 5 , thecatalyst 200b may be provided onto thepolymer fiber 100 in a form of layer. Specifically, thecatalyst 200b may be provided onto thepolymer fiber 100 in a form of particle or layer depending on a ratio of a weight of theprecursor 200a to a weight of thepolymer fiber 100 in the preparing of thefiber composite 300. For example, thecatalyst 200b may be provided onto thepolymer fiber 100 in the form of layer, if thepolymer fiber 100 includes a PAN fiber and theprecursor 200a includes urea, and if a weight ratio between the PAN fiber and the urea exceeds 50 mg : 3 g. - Although (a) and (b) of
FIG. 5 show thepolymer fiber 100 in a form of cylinder for convenience of explanation, a surface of thepolymer fiber 100 may have a concavo-convex shape including concave and convex portions. Accordingly, thecatalyst 200b may be provided onto the plurality of concave and convex portions in a form of particle, or may be provided in a form of layer, which conformally covers the surface of the concave and convex portions. - According to one embodiment, the
fiber composite 300 may be heat-treated at a temperature of 580 °C or above and less than a temperature at which the polymer is carbonized. The temperature at which the polymer is carbonized may vary depending on a type of the polymer. For example, if the polymer includes PAN, thefiber composite 300 may be heat-treated at a temperature of 580 °C. - In contrast, if the
fiber composite 300 is heat-treated at a temperature of less than 580 °C, a contraction of thepolymer fiber 100, which will be described below, may not occur, so that cavities may not be easily formed within thepolymer fiber 100. Further, if thefiber composite 300 is heat-treated at a temperature, at which the polymer is carbonized, or above, theprecursor 200a may not be easily converted into thecatalyst 200b, so that cavities may not be easily formed within thepolymer fiber 100, which will be described below. - Referring to
FIGS. 1 and6 , as thefiber composite 300 is heat-treated, thecatalyst 200b may fix anouter wall 100b of the polymer fiber 100 (S150). Specifically, if thefiber composite 300 is heat-treated, adhesion between thecatalyst 200b and thepolymer fiber 100 may be enhanced, and thus thecatalyst 200b may fix theouter wall 100b of thepolymer fiber 100. - Further, as the
fiber composite 300 is heat-treated, thepolymer fiber 100 may be contracted to formcavities 100h within thepolymer fiber 100. Specifically, thepolymer fiber 100 may be contracted toward theouter wall 100b of thepolymer fiber 100 from acenter 100a of diameter of thepolymer fiber 100. In this case, the adhesive strength between thepolymer fiber 100 and thecatalyst 200b may be stronger than a contraction force of thepolymer fiber 100. Accordingly, thecavities 100h may be formed within thepolymer fiber 100. - In other words, if the
fiber composite 300 is heat-treated, theprecursor 200a provided onto thepolymer fiber 100 may be converted into thecatalyst 200b and the adhesive strength between thecatalyst 200b and thepolymer fiber 100 may become strong. Further, as thepolymer fiber 100 is heat-treated, a contraction phenomenon of thepolymer fiber 100 may occur. - In this case, as the adhesive strength between the
polymer fiber 100 and thecatalyst 200b is stronger than the contraction force of thepolymer fiber 100, thepolymer fiber 100 may be contracted while theouter wall 100b of thepolymer fiber 100 is fixed by thecatalyst 200b. Accordingly, thepolymer fiber 100 may be contracted toward theouter wall 100b of thepolymer fiber 100 from acenter 100a of diameter of the polymer fiber, and thecavities 100h may be formed within thepolymer fiber 100. - If the
cavities 100h are formed within thepolymer fiber 100, thecatalyst 200b may be provided not only onto a surface of thepolymer fiber 100, but also within thecavities 100h of thepolymer fiber 100. However, an amount of thecatalyst 200b provided onto the surface of thepolymer fiber 100 may be more than an amount of thecatalyst 200b provided within thecavities 100h of thepolymer fiber 100. - The method for preparing a hollow fiber composite according to an embodiment of the present invention as described above may include preparing the
polymer fiber 100, providing theprecursor 200a containing nitrogen onto thepolymer fiber 100, and heat-treating thepolymer fiber 100 provided with theprecursor 200a. - Further, as the
polymer fiber 100 provided with theprecursor 200a is heat-treated, theprecursor 200a may be converted into thecatalyst 200b, and the adhesive strength between thecatalyst 200b and thepolymer fiber 100 may be enhanced, so that thecatalyst 200b may fix theouter wall 100b of thepolymer fiber 100. In this case, thepolymer fiber 100 may be contracted toward theouter wall 100b from acenter 100a of diameter of thepolymer fiber 100, so that thecavities 100h may be formed within thepolymer fiber 100. - Accordingly, a surface area of the
polymer fiber 100 may be increased to enhance a content of thecatalyst 200b. Further, the hollow fiber composite may be used as an artificial photosynthetic material, a photocatalyst responding to light, etc., depending on a type of thecatalyst 200b, and may be also used as a material which carries out reduction of contaminants such as carbon dioxide. Furthermore, the hollow fiber composite may be also used as a composite material, a conductive polymer composite material, a photoelectrochemical water-splitting material, etc., which are used in an electrode material with an improved rate of ionic adsorption, a gas sensor with an improved rate of gas adsorption, an energy storage, and a radiator panel of aircrafts, cars, etc. - Hereinafter, specific experimental examples and the results of property evaluation will be described with regard to the hollow fiber composite prepared in accordance with the method for preparing the hollow fiber composite according to an embodiment of the present invention.
- A PAN nanofiber was prepared by electrospinning a polyacrylonitrile (PAN) solution through a single nozzle. After that, a fiber composite was prepared by immersing the PAN nanofiber having a weight of 50 mg into a solution containing urea having a weight of 3 g, after which the fiber composite was heat-treated at a temperature of 580 °C under an atmosphere of argon (Ar) gas, so as to prepare a hollow fiber composite according to an embodiment, in which g-C3N4 was provided onto the PAN nanofiber.
- A PAN nanofiber was prepared by electrospinning a PAN solution.
- A carbonized PAN nanofiber was prepared by carbonizing a PAN nanofiber which was prepared by electrospinning a PAN solution through a single nozzle. After that, a fiber composite was prepared by immersing the carbonized PAN nanofiber into a solution containing urea and thiourea, after which the fiber composite was heat-treated at a temperature of 580 °C under an atmosphere of argon (Ar) gas, so as to prepare a hollow fiber composite according to an embodiment, in which g-C3N4 was provided onto the carbonized PAN nanofiber.
- The hollow fiber composite according to the embodiment, the nanofiber according to Comparative Example 1, and the hollow fiber composite according to Comparative Example 2 are summarized in the following Table 1.
[Table 1] Classification Structure Example PAN/g-C3N4 hollow fiber composite Comparative Example 1 PAN nanofiber Comparative Example 2 Carbonized PAN/g-C3N4 nanofiber composite -
FIG. 7 is a view showing pictures of a hollow fiber composite according to an embodiment of the present invention. - Referring to (a) and (b) of
FIG. 7 , the hollow fiber composite according to the embodiment was photographed through a scanning electron microscope (SEM) with magnification power of 500 nm and 5.00 um. As can be understood from (a) and (b) ofFIG. 7 , it might be confirmed that the hollow fiber composite according to the embodiment has cavities formed within the fiber composite. Further, the surface area (m2/g) and total pore volume (cm3/g) properties of the hollow fiber composite, which was photographed through the SEM with reference to (a) and (b) ofFIG. 7 , and the PAN nanofiber according to Comparative Example 1 are summarized in the following Table 2.[Table 2] Classification Surface area (m2/g) (R=coeffiecient) Total pore volume (cm3/g) (p/po=0.990) as,BET as,Lang Experimental Example 65.9 (R=0.9999) No. Lang fit 0.181 Comparative Example 19.1 (R=0.9965) No. Lang fit 0.015 - As can be understood from Table 2, it may be seen that the hollow fiber composite according to the embodiment has a surface area value about seven times more than that of the PAN nanofiber, and has a total pore volume value about 12 times more than that of the PAN nanofiber. In other words, it may be seen that the hollow fiber composite according to the embodiment, in which g-C3N4 is provided onto the PAN nanofiber, has excellent surface area and total pore volume properties.
-
FIG. 8 is a view showing pictures of a nanofiber composite according to Comparative Example 2 of the present invention. - Referring to (a) and (b) of
FIG. 8 , a side and a surface of the nanofiber composite according to above Comparative Example 2 were photographed through a transmission electron microscope (TEM) with magnification power of 50 nm. As can be understood from (a) and (b) ofFIG. 8 , it may be confirmed that the nanofiber composite according to above Comparative Example 2 does not have cavities formed therein. Further, it may be confirmed that the nanofiber composite according to above Comparative Example 2 has a carbonized PAN surface coated with g-C3N4. -
FIGS. 9 to 11 are views showing pictures of hollow fiber composites according to embodiments of the present invention, which are prepared at mutually different temperatures. - Referring to
FIGS. 9 to 11 , the PAN nanofiber according to the embodiment, which was immersed in urea, was heat-treated at temperatures of 300 °C, 400 °C and 580 °C to prepare hollow fiber composites, which were then photographed through the SEM respectively. - As can be confirmed from
FIGS. 9 and 10 , the hollow fiber composites prepared by being heat-treated at temperatures of 300 °C and 400 °C do not have cavities formed in a part thereof. On the other hand, as can be confirmed fromFIG. 11 , it might be confirmed that the hollow fiber composite prepared by being heat-treated at a temperature of 580 °C has cavities easily formed therein. Accordingly, in case of preparing the hollow fiber composite according to the embodiment, it may be seen that it is easy to heat-treat the PAN nanofiber immersed in urea at a temperature of 580 °C or above. -
FIG. 12 is a graph showing a change in properties of a hollow fiber composite according to an embodiment of the present invention depending on a concentration of urea. - Referring to
FIG. 12 , in a process of preparing a hollow fiber composite according to the embodiment, a concentration of urea was adjusted in a step of immersing a PAN fiber into a solution containing urea. Next, the hollow fiber composite was prepared when there is no urea (PAN@580) and when there are 2.4 g, 3 g, 4 g and 5 g of urea, after which a transmittance (%)depending on wavenumbers (cm-1) was measured, and the results were shown in a graph of FT-IR (Fourier transform infrared spectroscopy). - As can be understood from
FIG. 12 , it might be confirmed that the hollow fiber composite (PAN@580) without urea does not show any peak and the hollow fiber composite prepared through immersion into the solution containing 2.4 g of urea shows one peak at 1200-1640 cm-1. On the other hand, it might be confirmed that the hollow fiber composites prepared through immersion into the solutions containing 3 g, 4 g and 5 g of urea show two peaks at 1200-1640 cm-1 and 800-880 cm-1. - In other words, in case of generally measuring FT-IR, a peak related to g-C3N4 may be confirmed at 1200-1640 cm-1 and 800-880 cm-1. However, in case of the hollow fiber composites prepared through immersion into the solutions containing 3 g, 4 g and 5 g of urea, it is confirmed that a peak is shown in the range described above. Thus, it may be seen that the hollow fiber composite prepared through immersion into the solutions containing 3 g, 4 g and 5 g of urea have g-C3N4 easily formed therein. Accordingly, in case of preparing the hollow fiber composite according to the embodiment, it may be seen that g-C3N4 is easily formed by immersing the PAN fiber into the solution containing at least 3 g of urea.
- Although the present invention has been described in detail with reference to exemplary embodiments, the scope of the present invention is not limited to a specific embodiment and should be interpreted by the attached claims. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.
- A hollow fiber composite according to an embodiment of the present invention and a method for preparing the same may be utilized in various fields of industry such as a photocatalyst, an artificial photosynthetic material, an electrode material, a gas sensor, an energy storage, a radiator panel, etc.
Claims (13)
- A method for preparing a hollow fiber composite, the method comprising:preparing a polymer fiber;providing a precursor containing nitrogen onto the polymer fiber; andheat-treating the polymer fiber provided with the precursor,wherein the precursor is heat-treated to be converted into a catalyst and the polymer fiber is heat-treated to have cavities formed therein.
- The method of claim 1, wherein, as the polymer fiber provided with the precursor is heat-treated, an adhesive strength between the catalyst and the polymer fiber is enhanced so that the catalyst is allowed to fix an outer wall of the polymer fiber, and the polymer fiber is contracted toward the outer wall from a center of diameter of the polymer fiber so that cavities are formed within the polymer fiber, and wherein the adhesive strength between the catalyst and the polymer fiber is stronger than a contraction force of the polymer fiber.
- The method of claim 1, wherein the providing of the precursor containing nitrogen onto the polymer fiber is performed by immersing the polymer fiber into a solution containing the precursor, and the catalyst is provided onto the polymer fiber in a form of particle or layer depending on a ratio of a weight of the precursor to a weight of the polymer fiber.
- The method of claim 1, wherein the polymer fiber provided with the precursor is heat-treated at a temperature of 580°C or above and less than a temperature at which the polymer is carbonized.
- The method of claim 1, wherein an amount of the precursor permeating into the polymer fiber is increased as a thickness of the polymer fiber is decreased.
- The method of claim 1, wherein the polymer includes polyacrylo nitrile (PAN).
- The method of claim 1, wherein the precursor includes urea.
- The method of claim 1, wherein the catalyst includes g-C3N4.
- A method for preparing a hollow fiber composite, the method comprising:preparing a fiber composite including a precursor containing nitrogen and provided onto a surface of a polymer fiber; andheat-treating the fiber composite,wherein, as the fiber composite is heat-treated, the precursor is converted into a catalyst, an adhesive strength between the catalyst and the polymer fiber is enhanced so that the catalyst is allowed to fix an outer wall of the polymer fiber, and
the polymer fiber is contracted toward the outer wall from a center of diameter of the polymer fiber so that cavities are formed within the polymer fiber. - The method of claim 9, wherein the adhesive strength between the polymer fiber and the catalyst is stronger than a contraction force of the polymer fiber.
- The method of claim 9, wherein the catalyst is provided onto the surface of the polymer fiber in a form of particle or layer.
- The method of claim 9, wherein the polymer includes polyacrylo nitrile (PAN), and the catalyst includes g-C3N4.
- The method of claim 9, wherein the catalyst is formed prior to the cavities within the polymer fiber.
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