KR20150102514A - silica nanotube with metal complex particles in tube walls and manufacturing method thereof - Google Patents
silica nanotube with metal complex particles in tube walls and manufacturing method thereof Download PDFInfo
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- KR20150102514A KR20150102514A KR1020140024487A KR20140024487A KR20150102514A KR 20150102514 A KR20150102514 A KR 20150102514A KR 1020140024487 A KR1020140024487 A KR 1020140024487A KR 20140024487 A KR20140024487 A KR 20140024487A KR 20150102514 A KR20150102514 A KR 20150102514A
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Abstract
Description
The present invention relates to a silica nanotube in which alloy particles are enclosed in a tube wall, a manufacturing method thereof, and the like.
Nanometer-sized inorganic compound tubes have been extensively studied in nanotechnology due to their potential applications. Silica nanotubes can be used as a matrix for the synthesis of environmental materials such as sensors, electronic materials, harmful substances removal, and energy conversion catalyst carriers, and various materials. In fact, dispersing nanometer-sized silica particles in a polymer material makes it possible to manufacture a bumper having a light weight and a high strength. Further, when the nano device is dispersed in a tire or the like, wear of the polymer material can be reduced. .
On the other hand, silver (Ag) nanoparticles are known to have characteristics such as sterilizing power, antibacterial power, deodorizing power, electromagnetic wave shielding effect and the like. Conventional methods for producing silver nanoparticles are generally known to be produced on a colloid or by using plasma, but it is necessary to newly implement the conditions for nanogenization from the synthesis, and there is a problem of high cost, There is a problem that cohesion phenomenon is strong and difficult to handle, and it is difficult to secure optical properties such as transparency.
On the other hand, in the stability part, silver metal is generally known to be harmless to the human body. However, in recent data, it has been reported that silver is eluted or absorbed into the human body and silver poisoning occurs and affect skin tissue to gray, Stability problems have been frequently mentioned. As a method for solving this, J, -X. Wang et al. Prepared HSNTs by adsorbing HSNT in an aqueous solution of silver ion compounds ( Materials chemistry and Physics , 96, 2006, 90-97 ), and silver (Ag) is still located outside the HSNT, and thus there is a high possibility of desorption and oxidation, and nanoparticle stability and harmfulness exist.
Various embodiments of the present invention are directed to any one or more of the following problems.
That is, it aims to prevent the separation of the alloy metal by using the technique of covering the alloy metal inside the silica nanotube, to make the dispersion of the alloy metal excellent, and to prevent the aggregation of the alloy metal.
It is also an object of the present invention to prevent the oxidation of the nano metal through a metal alloy to maintain the metal performance, and to mass-produce the nano metal at a low cost as compared with the use of a single metal.
Further, the present invention aims to utilize various metals by combining them to be used in various application fields.
As means for solving the above problem,
One means of the present invention provides a silica nanotube in which alloy particles are enclosed in a tube wall.
In addition, all or a part of the alloy particles include a core-shell structure, and the metal of the core is more ionized than the metal of the shell, and the silica nanotube encapsulated with the alloy particle is provided do.
The metal of the core may include at least one of lithium, magnesium, aluminum, manganese, zinc, chromium, iron, cobalt, nickel and tin. The metal of the shell may be at least one of copper, silver, platinum, gold, The present invention provides a silica nanotube encapsulated with alloy particles.
The present invention also provides a method for producing a metal-silica nanotube, comprising: obtaining a first metal-silica nanotube in which a first metal is enclosed in a silica nanotube; And introducing ions of a second metal having a lower ionization tendency than the first metal into the first metal-silica nanotubes to replace a part of the first metal with a second metal to form an alloy, A method for producing encapsulated silica nanotubes is provided.
The step of obtaining the first metal-silica nanotube may include the steps of: preparing a nanotube template; Preparing a complex in which the ions of the first metal are bonded to the nanotube template; Preparing a silica nanotube by subjecting the complex to a silica precursor; And reducing the ions of the first metal.
The silica nanotubes encapsulated with the alloy particles according to the present invention and the production method thereof provide at least one or more of the following effects.
That is, by enclosing alloy particles inside the tube wall, it is possible to prevent the separation of the alloy metal, thereby solving the problem of stability and harmfulness.
In addition, by dispersing the silica nanotubes having excellent dispersibility in another medium, dispersion of the alloy particles can be made excellent and aggregation of the alloy metal can be prevented.
In addition, the metal alloy prevents metal oxidation and discoloration, thereby maintaining the performance of the metal particles, and enabling mass production at a lower cost than using a single metal.
In addition, various metals can be combined and alloyed for various applications.
1 is a schematic view for explaining a silica nanotube encapsulated with alloy particles according to an embodiment of the present invention and a method of manufacturing the same.
Hereinafter, the present invention will be described in detail with reference to examples. It should be understood, however, that there is no intention to limit the scope of protection of the present invention, even if there are definite and definitive expressions, since the following examples are merely intended to illustrate the present invention more clearly.
The silica nanotubes according to an embodiment of the present invention are characterized in that alloy particles are enclosed within a tube wall. As an example of the method for producing the same, there is provided a method for producing a metal-silica nanotube, comprising the steps of: obtaining a first metal-silica nanotube containing a first metal in a silica nanotube; And a step of alloying by substituting a part of the first metal with the second metal to prepare the silica nanotubes encapsulating the alloy particles.
1 is a schematic view of a silica nanotube in which alloy particles are enclosed in a tube wall and a method of manufacturing the same according to an embodiment of the present invention.
First, as shown in FIG. 1, a step (S100) of obtaining a first metal-silica nanotube encapsulating a first metal in a silica nanotube (in FIG. 1, the first metal is represented by M 1 , The metal ion is represented by M 1 n + ). The step (S100) of obtaining the first metal-silica nanotubes will be described later in more detail.
Thereafter, the second metal is introduced into the first metal-silica nanotube with ions of a second metal having a lower ionization tendency than that of the first metal, and a part of the first metal is substituted with a second metal to be alloyed (S200) The encapsulated silica nanotubes can be prepared (in FIG. 1, the second metal is represented by M 2 ).
All or a portion of the alloy particles may comprise a core-shell structure. Further metal may be alloyed or additional coating layers may be present and are all included in the present invention. The method of embodying alloy particles in a coherent-shell structure can be varied and can be realized through a redox reaction in which a part of the metal of the core is replaced with a metal of the shell. That is, by introducing ions of a second metal having a lower ionization tendency than a first metal enclosed in the silica nanotube, a part of the first metal is oxidized and the second metal is reduced and substituted to form alloy particles, Shell alloy particles in which the first metal becomes a core and the second metal becomes a shell.
The first metal of the core may include, but is not limited to, one or more of lithium, magnesium, aluminum, manganese, zinc, chromium, iron, cobalt, nickel and tin, , Platinum, gold, and palladium, and the core-shell metal combination may be variously obtained. The metal of the exemplified shell is a relatively expensive metal. It is possible to realize cost reduction by using a low-cost metal in parallel as in the embodiment of the present invention, rather than using it as a single particle. Further, since the portion substantially exposed to the outside is the metal of the shell, it is possible to provide an effect similar to or equivalent to that of using the expensive metal particles alone. As an example of the core-shell alloy particle, the metal of the core may be zinc and the metal of the shell may be silver.
In order to alloy the first metal of the first metal-silica nanotube with the ions of the second metal, the first metal-silica nanotube is dispersed in water, and ions of the second metal are introduced to perform oxidation-reduction reaction . (NO 3 - ), sulfuric acid (SO 4 2 - ), chloride ion (Cl - ), or the like can be used as an anion of the second metal compound. And is not limited.
Hereinafter, the step (S100) of obtaining the first metal-silica nanotubes will be described in detail.
That is, the step of obtaining the first metal-silica nanotube (S100) includes a step (S110) of producing a nanotube template (S110), a step (S120) of producing a complex in which the ions of the first metal are bound to the nanotube template, (S130) of producing the silica nanotubes by subjecting the complex to a silica precursor, and reducing the ions of the first metal (S140).
The mold agent used in the step of fabricating the nanotube mold (S110) is not limited as long as it is a master mold capable of forming a nanotube shape, and preferably a peptide-based master mold can be used. For example, Lt; RTI ID = 0.0 > alkyl < / RTI > Preferably, at least one of glycidyldecylamide (GDA), 2-amino-N-dodecylacetamide, 2-amino-N-decyl acetamide and 2-amino-N-tetradecyl acetamide is selected It is good to use.
In order to prepare a nanotube template, a core agent is added to an alcohol aqueous solution to dissolve the aqueous alcohol solution until it becomes transparent, and then cooled to room temperature to obtain a nanotube template. The casting agent is preferably stirred at a temperature of 60 ± 1 ° C so that it can be easily dissolved in an alcohol aqueous solution. It is then preferable to control the size of the nanotube template by stirring it at 2 DEG C for about 1 hour.
It is preferable that the alcohol aqueous solution is mixed with 5 to 10% by weight of alcohol and 90 to 95% by weight of purified water. When the amount of the alcohol is less than 5% by weight, the amount of the alcohol is insufficient and the mold may not be sufficiently dissolved. When the amount of the alcohol is more than 10% by weight, the casting agent is diluted with alcohol, There is a fear that it takes a long time to recover the mold and to recover the mold. The alcohol is preferably selected from one or more of ethanol, methanol, propanol, and butanol pentanol.
It is advisable to add 15 ~ 25 ml of water and 1 ~ 5 ml of alcohol to 1 mmol of primary broth. If the amount of the alcohol aqueous solution added is less than the above range, the mold may not be dissolved sufficiently and the reaction may not be performed smoothly. If the amount exceeds the above-defined range, self-assembly may be difficult and the yield of the cast product may decrease have.
The step (S120) of preparing a complex in which the ions of the first metal are bound to the nanotube template (S120) is a step of binding the ions of the first metal to the peptide nanotube template to obtain a complex.
The ions of the first metal may be added to the nanotube template solution, followed by stirring to obtain a complex. Although it is not limited, it is preferable to add 4 to 8 ml of the first metal ion aqueous solution with a concentration of 0.1 mmol based on 1 mmol of the primary syringe.
Ions of the first metal is first may be obtained from the first metal compound, a nitrate but not an anion of the first metal compound is restricted (NO 3 -), sulfate (SO 4 2 -), chloride ion (Cl -), oxygen Ion (O 2 - ) and the like. Since the examples of the first metal have been described above, the description is omitted.
The step (S130) of fabricating the silica nanotubes by imaging the complex with the silica precursor is a step of encapsulating the first metal ions in the tube wall while forming the silica nanotubes. Silica precursor is added and stirred vigorously for about 1 hour and stored at room temperature and static condition for 3 days to complete the silica nanotubes as the silica precursor gels through self-assembly of the surfactant molecules.
The precursors include, but are not limited to, tetraethoxyorthosilicate (TEOS), tetramethoxyorthosilicate (TMOS), tetra (methylhexylketoximo) silane, vinyloxymosilane (VOS), phenyltris ) Silane (POS), and methyloximo (MOS) can be selected and used. The precursor is preferably added in an amount of 4 to 10 mmol based on 1.0 mmol of the predominant agent. When the addition amount of the precursor is less than 4 mmol, the stability of the structure in which the film thickness of the silica becomes too thin may be impaired. When the addition amount exceeds 10 mmol, the silica outer wall thickness is too thick, But other structures such as a multiwall may occur, which may hinder the function of the metal particles.
The step of reducing the ions of the first metal (S140) is a process of reducing the ion-bonded complex of the first metal obtained. The reducing agent is not limited, but at least one of NaBH 4 , LiAlH 4 , and N 2 H 4 can be selected. The reducing agent is preferably added in an amount of 0.2 to 0.6 mol based on 1.0 mol of the main agent. When the addition amount of the reducing agent is less than 0.2 mol, the conversion to the first metal particles may be lowered. When the addition amount of the reducing agent is more than 0.6 mol, the conversion to the first metal particles is not significantly increased, There is a possibility that an excessive amount of the reducing agent remains in the solution.
In one example, by stirring by the addition of NaBH 4 solution it can be reduced to the first metal ion. The NaBH 4 aqueous solution is preferably a solution prepared by dissolving 10 to 15 mmol of NaBH 4 in 50 ml of distilled water. The first metal ion may be reduced by stirring using a Markethic bar for about 1 hour.
Thereafter, post-processing can be performed. Filtering with a pressure reducing device, removing the reducing agent remaining in distilled water, removing the casting agent present in the silica nanotubes with heated alcohol, and drying. Specifically, the first metal-silica nanotubes were filtered under reduced pressure of 10 to 50 mmHg and then washed with distilled
In yet another embodiment of the present invention, in the step (S100) of obtaining the first metal-silica nanotubes described above, the step (S130) of producing the silica nanotubes by subjecting the complex to a silica precursor, The order of reducing the ions of the metal (S140) may be changed. In other words, the application can proceed after the reduction.
That is, the process of fabricating the nanotube template (S110) and the process of fabricating the nanotube template with a complex of ions of the first metal (S120) are the same, The step of reducing the ions (S140) may be performed first, followed by the step of fabricating the silica nanotubes by employing the silica precursor in the form of a silica precursor (S130). The detailed description of each step is omitted because it has been described above.
Hereinafter, the present invention will be described in more detail with reference to Production Examples and Experimental Examples. However, the following Preparation Examples and Experimental Examples are given for the purpose of helping understanding of the present invention, and thus the scope of the present invention is not limited thereto.
Preparation Example 1: Preparation of silica nanotubes containing a first metal by a post-reduction method
1 mmol of glycidyldecylamide (GDA) as a gel-forming agent was added to 20 mL of a 10% aqueous solution of ethyl alcohol, and the mixture was stirred at a temperature of 60 ± 1 ° C for 1 hour until the aqueous solution of ethyl alcohol became transparent. Lt; 0 > C for 1 hour. Then, 5 ml of an aqueous solution containing the first metal ion was added as shown in Table 1, and then the magnet was stirred for about 1 hour to obtain a gel solution in which the first metal ion complex aqueous solution was formed. Thereafter, 4 mmol of tetraethoxyorthosilicate (TEOS), which is a silica precursor, was added and stirred vigorously at room temperature for 1 hour to obtain silica nanotubes containing the first metal ions in the tube wall. Thereafter, 0.2 mmol of reducing agent NaBH 4 was added to reduce the first metal ion, followed by filtration under reduced pressure of 30 mmHg, followed by washing three times with 200 ml of distilled water. Then, 100 ml of ethyl alcohol at 60 ° C was used Washed three times and dried at a temperature of 80 +/- 2 DEG C for 24 hours to prepare a first metal-silica nanotube containing a first metal in the tube wall.
(Molar concentration)
Preparation Example 2: Preparation of silica nanotubes containing a first metal by a conversion source system
As in Preparation Example 1, the first metal ion complex aqueous solution was formed to obtain a gel solution, and then 0.2 mmol of NaBH 4 as a reducing agent was added to reduce the first metal ion. Thereafter, 4 mmol of silica precursor, tetraethoxyorthosilicate (TEOS) was added and stirred vigorously at room temperature for 1 hour to obtain silica nanotubes, which were then vacuum filtered at a pressure of 30 mmHg and washed three times with 200 ml of distilled water Then, the resultant was washed three times with 100 ml of ethyl alcohol at 60 ° C and dried at 80 ± 2 ° C for 24 hours to prepare a first metal-silica nanotube containing a first metal in the tube wall.
PREPARATION EXAMPLE 3 Preparation of Silica Nanotube Containing Alloy Particles in a Tube Wall
To the aqueous solution of the first metal-silica nanotubes prepared in Preparation Example 1 (Preparation Example 3-5 and Preparation Example 3-6 were separately prepared by the method of Preparation Example 1) in water was added the second metal The compound was stirred at room temperature for from 0 to 1 hour, and a part of the first metal was substituted with the second metal through oxidation-reduction reaction with the first metal to be alloyed. After completion of the reaction, the reaction mixture was filtered under reduced pressure of 30 mmHg, washed three times with 200 ml of distilled water, washed three times with 100 ml of ethyl alcohol at 60 ° C, and dried at 80 ± 2 ° C for 24 hours A silica nanotube containing alloy particles of a first metal and a second metal in a tube wall was prepared.
Content (molar concentration)
The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.
Claims (14)
Wherein all or a part of the alloy particles include a core-shell structure, and the metal of the core is more ionized than the metal of the shell.
The metal of the core includes at least one of lithium, magnesium, aluminum, manganese, zinc, chromium, iron, cobalt, nickel,
Wherein the metal of the shell comprises at least one of copper, silver, platinum, gold, and palladium.
Wherein the metal of the core is zinc and the metal of the shell is silver.
Introducing an ion of a second metal having a lower ionization tendency than the first metal into the first metal-silica nanotube to replace the first metal with a second metal to form an alloy; Wherein the method comprises the steps of:
The step of obtaining the first metal-silica nanotube may include:
Preparing a nanotube template;
Preparing a complex in which the ions of the first metal are bonded to the nanotube template;
Reducing the ions of the first metal; And
Silica nanotubes in the presence of a silica precursor to produce silica nanotubes.
The step of obtaining the first metal-silica nanotube may include:
Preparing a nanotube template;
Preparing a complex in which the ions of the first metal are bonded to the nanotube template;
Preparing a silica nanotube by subjecting the complex to a silica precursor; And
And reducing the ions of the first metal, wherein the alloy particles are encapsulated.
Wherein the peptide nanotube template is used as the nanotube template and the peptide is selected from among glycyl alkylamides having an alkyl group having 8 to 18 carbon atoms, ≪ / RTI >
Wherein the first metal is zinc and the zinc ion is derived from a compound selected from Zn (NO 3 ) 2 , ZnCl 2 , ZnSO 4 and ZnO. .
The silica precursor may be selected from the group consisting of tetraethoxyorthosilicate (TEOS), tetramethoxyorthosilicate (TMOS), tetra (methylhexylketoximo) silane, vinyloxymosilane (VOS), phenyltris (butanone oxime) POS, and Methyloxymium (MOS) is selected and used.
The method of the step for the reduction of the ions of the first metal is NaBH 4, LiAlH 4, N2H 4 in the a, alloy particles, comprising a step of reduction with a reducing agent selected at least one inclusion silica nanotubes.
Wherein all or a part of the alloy particles have a core-shell structure, and the metal of the core tends to be ionized more than the metal of the shell.
The metal of the core includes at least one of lithium, magnesium, aluminum, manganese, zinc, chromium, iron, cobalt, nickel,
Wherein the metal of the shell comprises at least one of copper, silver, platinum, gold, and palladium.
Wherein the metal of the core is zinc and the metal of the shell is silver.
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| PCT/KR2014/012075 WO2015129998A1 (en) | 2014-02-28 | 2014-12-09 | Silica nanotube encapsulating alloy particles within wall of tube, and manufacturing method therefor |
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| KR102094903B1 (en) * | 2019-06-12 | 2020-03-30 | 이상호 | Zinc phthalocyanine-silica nanotube with high dispersibility and method for producing the same |
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| CN114405502B (en) * | 2020-10-28 | 2023-05-26 | 中国科学院大连化学物理研究所 | Preparation and application of catalyst with metal supported on inner wall of silica nanotube |
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| KR102094903B1 (en) * | 2019-06-12 | 2020-03-30 | 이상호 | Zinc phthalocyanine-silica nanotube with high dispersibility and method for producing the same |
| WO2020251202A1 (en) * | 2019-06-12 | 2020-12-17 | 이상호 | Highly dispersible zinc phthalocyanine-silica nanotubes and preparation method therefor |
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