CN115678188B - Xanthan gum hydrogel and preparation method and application thereof - Google Patents
Xanthan gum hydrogel and preparation method and application thereof Download PDFInfo
- Publication number
- CN115678188B CN115678188B CN202211329768.4A CN202211329768A CN115678188B CN 115678188 B CN115678188 B CN 115678188B CN 202211329768 A CN202211329768 A CN 202211329768A CN 115678188 B CN115678188 B CN 115678188B
- Authority
- CN
- China
- Prior art keywords
- xanthan gum
- parts
- hydrogel
- polyvinyl alcohol
- gum hydrogel
- 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.)
- Active
Links
- 229920001285 xanthan gum Polymers 0.000 title claims abstract description 184
- 239000000230 xanthan gum Substances 0.000 title claims abstract description 171
- 235000010493 xanthan gum Nutrition 0.000 title claims abstract description 171
- 229940082509 xanthan gum Drugs 0.000 title claims abstract description 171
- 239000000017 hydrogel Substances 0.000 title claims abstract description 129
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 105
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 75
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 75
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 44
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 230000008014 freezing Effects 0.000 claims abstract description 15
- 238000007710 freezing Methods 0.000 claims abstract description 15
- 235000011187 glycerol Nutrition 0.000 claims description 38
- 229910052799 carbon Inorganic materials 0.000 claims description 28
- 239000004744 fabric Substances 0.000 claims description 28
- 239000011259 mixed solution Substances 0.000 claims description 18
- GJCOSYZMQJWQCA-UHFFFAOYSA-N 9H-xanthene Chemical compound C1=CC=C2CC3=CC=CC=C3OC2=C1 GJCOSYZMQJWQCA-UHFFFAOYSA-N 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 238000004090 dissolution Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000011889 copper foil Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 29
- 239000004020 conductor Substances 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 41
- 229920000128 polypyrrole Polymers 0.000 description 9
- 239000002131 composite material Substances 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 229920002907 Guar gum Polymers 0.000 description 6
- 239000000665 guar gum Substances 0.000 description 6
- 235000010417 guar gum Nutrition 0.000 description 6
- 229960002154 guar gum Drugs 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 5
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- QBUKAFSEUHGMMX-MTJSOVHGSA-N (5z)-5-[[3-(1-hydroxyethyl)thiophen-2-yl]methylidene]-10-methoxy-2,2,4-trimethyl-1h-chromeno[3,4-f]quinolin-9-ol Chemical group C1=CC=2NC(C)(C)C=C(C)C=2C2=C1C=1C(OC)=C(O)C=CC=1O\C2=C/C=1SC=CC=1C(C)O QBUKAFSEUHGMMX-MTJSOVHGSA-N 0.000 description 1
- OHVLMTFVQDZYHP-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CN1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O OHVLMTFVQDZYHP-UHFFFAOYSA-N 0.000 description 1
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- 238000006136 alcoholysis reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- CLOMYZFHNHFSIQ-UHFFFAOYSA-N clonixin Chemical compound CC1=C(Cl)C=CC=C1NC1=NC=CC=C1C(O)=O CLOMYZFHNHFSIQ-UHFFFAOYSA-N 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention discloses a xanthan gum hydrogel, a preparation method and application thereof, wherein the xanthan gum hydrogel comprises the following components in parts by weight: 10-150 parts of xanthan gum, 150-250 parts of polyvinyl alcohol, 10-20 parts of carbon nano tubes, 500-2000 parts of glycerol and 500-1500 parts of water; and further preparing the piezoresistive sensor by matching with the electrode. According to the invention, the three-dimensional network structure of the xanthan gum hydrogel is utilized to disperse and fix the conductive material carbon nanotubes, so that the conductivity of the xanthan gum hydrogel is improved, and the sensitivity of the piezoresistive sensor of the xanthan gum hydrogel is further improved. Moreover, the sensitivity of the piezoresistive sensor can be better improved by the polyvinyl alcohol and the xanthan gum with proper mass ratio. In addition, the xanthan gum hydrogel has good elasticity and freezing resistance under low temperature conditions.
Description
Technical Field
The invention relates to the technical field of hydrogel sensors, in particular to xanthan gum hydrogel, and a preparation method and application thereof.
Background
The piezoresistive sensor is a flexible pressure sensor, mostly comprising conductive materials and electrodes, and the working principle of the piezoresistive sensor is that the external pressure or stimulus is converted into a readable electric signal and recorded, and the piezoresistive sensor is characterized in that when pressure is applied to the piezoresistive sensor, the sensor deforms, so that the resistance of a device changes, and the change of corresponding current is recorded by applying voltage to the sensor. The conductive material of the piezoresistive sensor is also a pressure sensitive material, and most of the materials are carbon nanotubes, reduced graphene oxide, metal nanomaterials, conductive polymers and the like. The conductive material is typically combined with a flexible substrate to form a flexible pressure sensitive film, which is then used to make a piezoresistive sensor that is comfortable to wear, durable, and flexible. Chinese patent CN112113498B uses polyvinyl alcohol hydrogel as a flexible substrate, and combines conductive polymer polypyrrole to prepare polypyrrole/polyvinyl alcohol composite film, and uses the polypyrrole/polyvinyl alcohol composite film to prepare the piezoresistive sensor, but the sensor has poor sensitivity, which is not beneficial to popularization and practical application of the piezoresistive sensor. Therefore, it is important to develop a new hydrogel in order to increase the sensitivity of the sensor.
Disclosure of Invention
The primary purpose of the invention is to solve the defects in the prior art and provide a xanthan gum hydrogel.
Another object of the present invention is to provide a method for preparing a xanthan hydrogel.
It is another object of the present invention to provide a xanthan hydrogel piezoresistive sensor.
It is still another object of the present invention to provide a method for manufacturing a xanthan gum hydrogel piezoresistive sensor.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a xanthan hydrogel comprising, in parts by weight: 10-150 parts of xanthan gum, 150-250 parts of polyvinyl alcohol, 10-20 parts of carbon nano tubes, 500-2000 parts of glycerol and 500-1500 parts of water.
According to the invention, the xanthan gum hydrogel with a three-dimensional network structure is formed through hydrogen bond crosslinking between the polyvinyl alcohol and the xanthan gum, and the three-dimensional network structure is utilized to disperse and fix the carbon nanotubes of the conductive material, so that the carbon nanotubes are uniformly distributed in the xanthan gum hydrogel and on the surface of the xanthan gum hydrogel, the conductivity of the xanthan gum hydrogel is improved, and the sensitivity of the piezoresistive sensor prepared from the xanthan gum hydrogel is further improved.
From this, it is known that the sensitivity of the piezoresistive sensor can be improved by forming a xanthan hydrogel from polyvinyl alcohol and xanthan.
In addition, the xanthan gum hydrogel provided by the invention has good elasticity at the low temperature of-60 to-35 ℃ and also has strong freezing resistance. Meanwhile, the xanthan gum hydrogel can still be stressed to deform at the low temperature of-60 to-35 ℃, so that the carbon nano tube contact site and the conductive channel inside the hydrogel can be changed, the resistance is further changed, and the piezoresistive sensor prepared by using the xanthan gum hydrogel can still continue to work normally at the low temperature.
Preferably, the xanthan gum hydrogel comprises the following components in parts by weight: 20-100 parts of xanthan gum, 180-200 parts of polyvinyl alcohol, 10-20 parts of carbon nano tubes, 500-2000 parts of glycerol and 500-1500 parts of water.
Further preferably, the xanthan gum hydrogel comprises, in parts by weight: 20-100 parts of xanthan gum, 180-200 parts of polyvinyl alcohol, 15 parts of carbon nano tubes, 1000 parts of glycerol and 1000 parts of water.
Preferably, the xanthan gum has a molecular weight of 200×10 4 ～2000×10 4 。
Further preferably, the xanthan gum has a molecular weight of 200×10 4 ～600×10 4 。
Preferably, the polyvinyl alcohol is 1799, i.e. PVA-1799, having a degree of polymerization of 1700 and an alcoholysis degree of 99%.
The PVA-1799 is selected in the invention, because compared with other types of polyvinyl alcohol (such as PVA-2499), the PVA-1799 has good water solubility, can be rapidly dissolved, has smaller viscosity, is favorable for uniformly dispersing the carbon nano tube, and is further favorable for improving the sensitivity of the piezoresistive sensor.
Preferably, the length of the carbon nanotubes is 50nm to 10 μm.
When the length of the carbon nano tube is within the range of 50 nm-10 mu m, the piezoresistance sensor prepared from the obtained xanthan gum hydrogel has higher sensitivity.
Further preferably, the carbon nanotubes have a length of 0.5 to 2. Mu.m.
Preferably, the mass ratio of the polyvinyl alcohol to the xanthan gum is (1-25): 1.
Further preferably, the mass ratio of the polyvinyl alcohol to the xanthan gum is (2-10): 1.
In addition, experiments show that the mass ratio of the polyvinyl alcohol to the xanthan gum has a great influence on the sensitivity of the piezoresistive sensor. The mass ratio of the polyvinyl alcohol to the xanthan gum is too large or too small, so that the stability of the three-dimensional network structure of the formed xanthan gum hydrogel is reduced, the dispersibility of the conductive material carbon nano tube in the xanthan gum hydrogel is reduced, and the conductivity of the xanthan gum hydrogel and the sensitivity of the piezoresistive sensor are further reduced.
From this, it can be seen that the sensitivity of the piezoresistive sensor can be better improved by the polyvinyl alcohol and the xanthan gum with a proper mass ratio.
A method for preparing xanthan gum hydrogel, comprising the following steps:
s1, mixing and dispersing xanthan gum, carbon nanotubes and glycerin to obtain a xanthan gum mixed solution;
s2, mixing polyvinyl alcohol and water, heating for dissolution, then adding a xanthan gum mixed solution, and performing freeze molding to obtain the xanthan gum hydrogel.
Preferably, the temperature of the heating dissolution in step S2 is 90 to 120 ℃.
Preferably, the temperature of the freeze molding in the step S2 is-60 to-35 ℃.
Freezing is a necessary condition for polyvinyl alcohol to form hydrogels. In general, polyvinyl alcohol is frozen at a low temperature of-20℃for 6 to 12 hours to form a hydrogel. However, after the addition of xanthan gum, carbon nanotubes and glycerol, the temperature at which polyvinyl alcohol freezes into gel becomes more severe, and only below-35 ℃ can hydrogels be formed. The motion state of xanthan gum molecular chain and polyvinyl alcohol molecular chain in the solution is frozen at a certain moment by freezing at a low temperature below minus 35 ℃, the contacted molecular chains can be interacted and entangled, the contacted molecular chains are tightly combined through physical actions such as hydrogen bonds and the like, and are not separated in a micro-area, and the micro-areas are called as physical crosslinking points to form a double-network structure which is beneficial to charge transmission, so that the sensitivity of the piezoresistive sensor prepared by utilizing the xanthan gum hydrogel can be improved.
Preferably, the time of the freeze-molding in step S2 is 10 to 14 hours.
A xanthan gum hydrogel piezoresistive sensor sequentially comprises an electrode, xanthan gum hydrogel and an electrode.
Preferably, the electrode is one or more of carbon cloth, copper foil or nickel electrode.
A preparation method of a xanthan gum hydrogel piezoresistive sensor comprises the following steps:
and assembling the electrode, the xanthan gum hydrogel and the electrode in sequence to obtain the xanthan gum hydrogel piezoresistive sensor.
The invention discloses a piezoresistive sensor of xanthan gum hydrogel, which is a piezoresistive sensor of a sandwich structure with xanthan gum hydrogel as a piezoresistive material.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the three-dimensional network structure of the xanthan gum hydrogel is utilized to disperse and fix the conductive material carbon nanotubes, so that the conductivity of the xanthan gum hydrogel is improved, and the sensitivity of the piezoresistive sensor of the xanthan gum hydrogel is further improved. Moreover, the sensitivity of the piezoresistive sensor can be better improved by the polyvinyl alcohol and the xanthan gum with proper mass ratio. In addition, the xanthan gum hydrogel provided by the invention has good elasticity at the low temperature of-60 to-35 ℃ and also has strong freezing resistance, and the piezoresistive sensor prepared by the xanthan gum hydrogel can still work normally in a low-temperature environment.
Drawings
FIG. 1 is a graph of resistance versus pressure for the xanthan gum hydrogel piezoresistive sensors of examples 1-4.
FIG. 2 is a graph of electrical resistance versus pressure for the comparative example 1 polyvinyl alcohol membrane piezoresistive sensor and the comparative examples 2-3 xanthan gum hydrogel piezoresistive sensors.
Fig. 3 is a final image of a xanthan hydrogel of example 1 at-40 ℃.
Fig. 4 is a graph of the final glycerin-free xanthan gum hydrogel of comparative example 5 at-40 ℃.
Fig. 5 is a diagram of a final product of the xanthan gum hydrogel with a small amount of glycerin of comparative example 6 at-40 ℃.
Detailed Description
The invention is further illustrated below with reference to examples. These examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. The experimental procedures in the examples below, without specific details, are generally performed under conditions conventional in the art or recommended by the manufacturer; the raw materials, reagents and the like used, unless otherwise specified, are those commercially available from conventional markets and the like. Any insubstantial changes and substitutions made by those skilled in the art in light of the above teachings are intended to be within the scope of the invention as claimed.
The reagents used in the examples and comparative examples of the present invention were as follows:
using a molecular weight of 200X 10 4 ～2000×10 4 Xanthan gum of (a);
polyvinyl alcohol of type 1799, namely PVA-1799, was used;
carbon nanotubes having a length of 0.5 to 2 μm are used.
Example 1
The embodiment provides a xanthan gum hydrogel, which comprises the following components in parts by weight: 20 parts of xanthan gum, 200 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 1000 parts of glycerol and 1000 parts of water; wherein, the mass ratio of the polyvinyl alcohol to the xanthan gum is 10:1, and the preparation method comprises the following steps:
s1, mixing and dispersing xanthan gum, carbon nanotubes and glycerin to obtain a xanthan gum mixed solution;
s2, mixing polyvinyl alcohol and water, heating to dissolve at 100 ℃, then adding the xanthan gum mixed solution, uniformly stirring, pouring into a culture dish, freezing at-40 ℃ for 12h for molding, and demoulding to obtain the xanthan gum hydrogel.
The xanthan gum hydrogel piezoresistive sensor sequentially comprises carbon cloth, xanthan gum hydrogel and carbon cloth, and the preparation method comprises the following steps:
and assembling the carbon cloth, the xanthan gum hydrogel and the carbon cloth in sequence to obtain the xanthan gum hydrogel piezoresistive sensor.
Example 2
The embodiment provides a xanthan gum hydrogel, which comprises the following components in parts by weight: 20 parts of xanthan gum, 180 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 1000 parts of glycerol and 1000 parts of water; wherein the mass ratio of polyvinyl alcohol to xanthan gum is 9:1, and the preparation method is the same as in example 1.
A xanthan gum hydrogel piezoresistive sensor sequentially comprises a carbon cloth, xanthan gum hydrogel and the carbon cloth, and the preparation method is the same as that of example 1.
Example 3
The embodiment provides a xanthan gum hydrogel, which comprises the following components in parts by weight: 70 parts of xanthan gum, 200 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 1000 parts of glycerol and 1000 parts of water; wherein the mass ratio of polyvinyl alcohol to xanthan gum is 20:7, and the preparation method is the same as in example 1.
A xanthan gum hydrogel piezoresistive sensor sequentially comprises a carbon cloth, xanthan gum hydrogel and the carbon cloth, and the preparation method is the same as that of example 1.
Example 4
The embodiment provides a xanthan gum hydrogel, which comprises the following components in parts by weight: 100 parts of xanthan gum, 200 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 1000 parts of glycerol and 1000 parts of water; wherein the mass ratio of polyvinyl alcohol to xanthan gum is 2:1, and the preparation method is the same as in example 1.
A xanthan gum hydrogel piezoresistive sensor sequentially comprises a carbon cloth, xanthan gum hydrogel and the carbon cloth, and the preparation method is the same as that of example 1.
Example 5
The embodiment provides a xanthan gum hydrogel, which comprises the following components in parts by weight: 10 parts of xanthan gum, 250 parts of polyvinyl alcohol, 10 parts of carbon nanotubes, 500 parts of glycerol and 500 parts of water; wherein the mass ratio of polyvinyl alcohol to xanthan gum is 25:1, and the preparation method is the same as in example 1.
A xanthan gum hydrogel piezoresistive sensor sequentially comprises a carbon cloth, xanthan gum hydrogel and the carbon cloth, and the preparation method is the same as that of example 1.
Example 6
The embodiment provides a xanthan gum hydrogel, which comprises the following components in parts by weight: 150 parts of xanthan gum, 150 parts of polyvinyl alcohol, 20 parts of carbon nanotubes, 2000 parts of glycerol and 1500 parts of water; wherein the mass ratio of polyvinyl alcohol to xanthan gum is 1:1, and the preparation method is the same as in example 1.
A xanthan gum hydrogel piezoresistive sensor sequentially comprises a carbon cloth, xanthan gum hydrogel and the carbon cloth, and the preparation method is the same as that of example 1.
Comparative example 1
This comparative example provides a polyvinyl alcohol film differing from example 1 in that it does not contain xanthan gum, comprising, in parts by weight: 200 parts of polyvinyl alcohol, 15 parts of carbon nano tubes, 1000 parts of glycerol and 1000 parts of water; the preparation method comprises the following steps:
s1, mixing and dispersing carbon nanotubes and glycerol to obtain a glycerol mixed solution;
s2, mixing polyvinyl alcohol and water, heating and dissolving at 100 ℃, then adding the glycerol mixed solution, uniformly stirring, pouring into a culture dish, freezing at-40 ℃ for 12h for molding, and demoulding to obtain the polyvinyl alcohol film.
The piezoresistive polyvinyl alcohol film sensor sequentially comprises carbon cloth, a polyvinyl alcohol film and the carbon cloth, and the preparation method comprises the following steps:
and assembling the carbon cloth, the polyvinyl alcohol film and the carbon cloth in sequence to obtain the polyvinyl alcohol film piezoresistive sensor.
Comparative example 2
The comparative example provides a xanthan gum hydrogel which differs from example 1 in that the mass ratio of polyvinyl alcohol to xanthan gum is 100:1, comprising, in parts by weight: 2 parts of xanthan gum, 200 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 1000 parts of glycerol and 1000 parts of water; the preparation method comprises the following steps:
s1, mixing and dispersing xanthan gum, carbon nanotubes and glycerin to obtain a xanthan gum mixed solution;
s2, mixing polyvinyl alcohol and water, heating to dissolve at 100 ℃, then adding the xanthan gum mixed solution, uniformly stirring, pouring into a culture dish, freezing at-40 ℃ for 12h for molding, and demoulding to obtain the xanthan gum hydrogel.
A xanthan gum hydrogel piezoresistive sensor sequentially comprises a carbon cloth, xanthan gum hydrogel and the carbon cloth, and the preparation method is the same as that of example 1.
Comparative example 3
The comparative example provides a xanthan gum hydrogel which differs from example 1 in that the mass ratio of polyvinyl alcohol to xanthan gum is 2:3, comprising, in parts by weight: 300 parts of xanthan gum, 200 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 1000 parts of glycerol and 1000 parts of water; the preparation method comprises the following steps:
s1, mixing and dispersing xanthan gum, carbon nanotubes and glycerin to obtain a xanthan gum mixed solution;
s2, mixing polyvinyl alcohol and water, heating to dissolve at 100 ℃, then adding the xanthan gum mixed solution, uniformly stirring, pouring into a culture dish, freezing at-40 ℃ for 12h for molding, and demoulding to obtain the xanthan gum hydrogel.
A xanthan gum hydrogel piezoresistive sensor sequentially comprises a carbon cloth, xanthan gum hydrogel and the carbon cloth, and the preparation method is the same as that of example 1.
Comparative example 4
The comparative example provides a polypyrrole/polyvinyl alcohol composite film, which is prepared according to the preparation method described in the example 5 of the Chinese patent CN 112113498B.
The polypyrrole/polyvinyl alcohol composite film piezoresistive sensor sequentially comprises carbon cloth, a polypyrrole/polyvinyl alcohol composite film and the carbon cloth, and the preparation method comprises the following steps:
and assembling the carbon cloth, the polypyrrole/polyvinyl alcohol composite film and the carbon cloth in sequence to obtain the polypyrrole/polyvinyl alcohol composite film piezoresistive sensor.
Comparative example 5
This comparative example provides a glycerin-free xanthan gum hydrogel which differs from example 1 in that it does not contain glycerin, comprising, in parts by weight: 20 parts of xanthan gum, 200 parts of polyvinyl alcohol, 15 parts of carbon nano tubes and 1000 parts of water; the preparation method comprises the following steps:
mixing polyvinyl alcohol and water, heating to 100deg.C for dissolving, adding xanthan gum and carbon nanotube, stirring, pouring into culture dish, freezing at-40deg.C for 12 hr for molding, and demolding to obtain hydrogel containing no glycerol.
Comparative example 6
This comparative example provides a xanthan gum hydrogel with a small amount of glycerol, which differs from example 1 in that the glycerol is small in amount, comprising, in parts by weight: 20 parts of xanthan gum, 200 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 200 parts of glycerol and 1000 parts of water; the preparation method comprises the following steps:
s1, mixing and dispersing xanthan gum, carbon nanotubes and glycerin to obtain a xanthan gum mixed solution;
s2, mixing polyvinyl alcohol and water, heating to dissolve at 100 ℃, then adding the xanthan gum mixed solution, stirring uniformly, pouring into a culture dish, freezing at-40 ℃ for 12h for molding, and demolding to obtain the xanthan gum hydrogel with a small amount of glycerin.
Comparative example 7
This comparative example provides a guar hydrogel which differs from example 4 in that guar is used instead of xanthan, comprising, in parts by weight: 100 parts of guar gum, 200 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 1000 parts of glycerol and 1000 parts of water; wherein, the mass ratio of the polyvinyl alcohol to the guar gum is 2:1, and the preparation method comprises the following steps:
s1, mixing and dispersing guar gum, carbon nanotubes and glycerol to obtain a guar gum mixed solution;
s2, mixing polyvinyl alcohol and water, heating to dissolve at 100 ℃, then adding the guar gum mixed solution, stirring uniformly, pouring into a culture dish, freezing at-40 ℃ for 12h for molding, and demoulding to obtain the guar gum hydrogel.
Comparative example 8
The comparative example provides a xanthan gum hydrogel comprising, in parts by weight: 20 parts of xanthan gum, 200 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 1000 parts of glycerol and 1000 parts of water; the mass ratio of the polyvinyl alcohol to the xanthan gum is 10:1, and the preparation method is different from that of the embodiment 1 in the temperature of freezing molding, and specifically comprises the following steps:
s1, mixing and dispersing xanthan gum, carbon nanotubes and glycerin to obtain a xanthan gum mixed solution;
s2, mixing polyvinyl alcohol and water, heating to dissolve at 100 ℃, then adding the xanthan gum mixed solution, uniformly stirring, pouring into a culture dish, freezing at-20 ℃ for 12 hours, and demoulding to obtain the xanthan gum hydrogel.
The xanthan gum hydrogel is not completely gelled, has a solid colloid surface, is easy to attach, cannot recover after being deformed under stress, and cannot form a sensor with an electrode.
Performance testing
The piezoresistive sensors of the examples and comparative examples were subjected to a sensitivity test, wherein the sensitivity S is defined as:
wherein DeltaR is the relative variation of resistance, R 0 For initial resistance, ΔP is the relative amount of change in pressure.
Table 1 sensitivity test results of piezoresistive sensors of examples and comparative examples
| Sample of | Mass ratio of polyvinyl alcohol to xanthan gum | Sensitivity S (kPa) -1 ) |
| Example 1 | 10:1 | 0.443 |
| Example 2 | 9:1 | 0.507 |
| Example 3 | 20:7 | 0.456 |
| Example 4 | 2:1 | 0.411 |
| Comparative example 1 | Does not contain xanthan gum | 0.0089 |
| Comparative example 2 | 100:1 | 0.0356 |
| Comparative example 3 | 2:3 | 0.0906 |
Note that: the sensitivity in the table is the sensitivity of the piezoresistive sensors of the examples and the comparative examples in the pressure range of 0 to 1kPa at normal temperature.
FIG. 1 is a graph of resistance versus pressure for the xanthan gum hydrogel piezoresistive sensors of examples 1-4. FIG. 2 is a graph of electrical resistance versus pressure for the comparative example 1 polyvinyl alcohol membrane piezoresistive sensor and the comparative examples 2-3 xanthan gum hydrogel piezoresistive sensors.
As can be seen from table 1 and fig. 1:
(1) The sensitivities of examples 1 to 4 and comparative examples 2 to 3 are both greater than that of comparative example 1, which means that the sensitivity of the piezoresistive sensor using the carbon nanotubes as the conductive material can be effectively improved after xanthan gum is added, because the xanthan gum hydrogel formed by polyvinyl alcohol and xanthan gum disperses and fixes the conductive material carbon nanotubes through its own three-dimensional network structure, so that the carbon nanotubes are uniformly distributed in and on the inner and outer surfaces of the xanthan gum hydrogel, the conductivity of the xanthan gum hydrogel is improved, and the sensitivity of the piezoresistive sensor is further improved. Furthermore, the present invention found through experiments that both examples 5 and 6 were inferior in sensitivity to example 4.
(2) The sensitivity of examples 1-4 is greater than that of comparative examples 2-3, indicating that polyvinyl alcohol and xanthan gum in the appropriate mass ratio can better improve the sensitivity of the piezoresistive sensor.
In addition, in the sensitivity test, the sensitivity of the piezoresistive sensor of the polypyrrole/polyvinyl alcohol composite film of comparative example 4 is far lower than that of the piezoresistive sensor of the xanthan gum hydrogel of each embodiment of the invention, namely the sensitivity of the piezoresistive sensor is improved by using the xanthan gum hydrogel.
In addition, the xanthan hydrogels of examples 1 to 6, the non-glycerol xanthan hydrogel of comparative example 5, the xanthan hydrogel of comparative example 6 with a small amount of glycerol, and the guar hydrogel of comparative example 7 were subjected to a low temperature icing test at-40 ℃, and compression and tensile elasticity tests, and as a result, found that:
(1) Fig. 3 is a final image of a xanthan hydrogel of example 1 at-40 ℃. As can be seen from fig. 3, the xanthan gum hydrogel of example 1 does not freeze at a low temperature of-40 ℃, is deformed under pressure, has good compression and stretching elasticity, and meanwhile, the piezoresistive sensor of the xanthan gum hydrogel prepared by using the hydrogel can continue to work normally at a low temperature of 0 ℃ to-40 ℃. Examples 2 to 6 also correspond to example 1 at a low temperature of-40 ℃.
(2) Fig. 4 is a graph of the final glycerin-free xanthan gum hydrogel of comparative example 5 at-40 ℃. As can be seen from fig. 4, the glycerin-free xanthan gum hydrogel of comparative example 5 was frozen at a low temperature of-40 ℃ and was not deformed by pressure, losing compression and tensile elasticity, and the piezoresistive sensor prepared by using the hydrogel could not work normally at a low temperature of 0 ℃ to-40 ℃.
(3) Fig. 5 is a diagram of a final product of the xanthan gum hydrogel with a small amount of glycerin of comparative example 6 at-40 ℃. As can be seen from fig. 5, the comparative example 6, in which glycerin is a small amount of xanthan gum hydrogel, is frozen at a low temperature of-40 ℃ and is not deformed by pressure, compression and stretching elasticity are lost, and the piezoresistive sensor prepared by using the hydrogel cannot work normally at a low temperature of 0 ℃ to-40 ℃.
(4) Comparative example 7 guar hydrogel in which guar was used instead of xanthan gum was not frozen at low temperatures of 0 to-40 ℃, but had inferior compression and tensile elasticity to the xanthan hydrogels of examples 1 to 4 of the present invention.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. A xanthan hydrogel, comprising, in parts by weight: 20-100 parts of xanthan gum, 180-200 parts of polyvinyl alcohol, 15 parts of carbon nanotubes, 1000 parts of glycerol and 1000 parts of water;
the preparation method of the xanthan gum hydrogel comprises the following steps:
s1, mixing and dispersing xanthan gum, carbon nanotubes and glycerin to obtain a xanthan gum mixed solution;
s2, mixing polyvinyl alcohol and water, heating for dissolution, then adding a xanthan gum mixed solution, and performing freeze molding to obtain xanthan gum hydrogel;
the temperature of the freezing molding in the step S2 is minus 60 to minus 35 ℃.
2. The xanthan gum hydrogel of claim 1, wherein the mass ratio of polyvinyl alcohol to xanthan gum is (2-10): 1.
3. The xanthan gum hydrogel of claim 1, wherein the temperature of the dissolution by heating in step S2 is 90-120 ℃.
4. The xanthan gum hydrogel of claim 1, wherein the time of freeze-forming in step S2 is 10-14 h.
5. The piezoresistive sensor for xanthan gum hydrogel is characterized by sequentially comprising an electrode, the xanthan gum hydrogel according to any one of claims 1-4 and the electrode.
6. The xanthan gum hydrogel piezoresistive sensor according to claim 5, wherein said electrode is one or more of carbon cloth, copper foil or nickel electrode.
7. A method of making a xanthan gum hydrogel piezoresistive sensor according to claim 5 or 6, comprising the steps of:
and assembling the electrode, the xanthan gum hydrogel and the electrode according to the sequence of any one of claims 1-4 to obtain the xanthan gum hydrogel piezoresistive sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211329768.4A CN115678188B (en) | 2022-10-27 | 2022-10-27 | Xanthan gum hydrogel and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211329768.4A CN115678188B (en) | 2022-10-27 | 2022-10-27 | Xanthan gum hydrogel and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115678188A CN115678188A (en) | 2023-02-03 |
| CN115678188B true CN115678188B (en) | 2023-12-12 |
Family
ID=85045489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211329768.4A Active CN115678188B (en) | 2022-10-27 | 2022-10-27 | Xanthan gum hydrogel and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115678188B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109251451A (en) * | 2018-08-30 | 2019-01-22 | 太原理工大学 | A kind of preparation method of pH responsive type xanthan gum/polyvinyl alcohol hydrogel |
| CN111053925A (en) * | 2019-12-02 | 2020-04-24 | 侯槿瑄 | Conductive hydrogel and exercise rehabilitation sensor manufacturing method based on conductive hydrogel |
| CN112210114A (en) * | 2020-10-27 | 2021-01-12 | 福州大学 | Preparation method of ultrahigh-strength multifunctional polyvinyl alcohol-based oil gel elastomer |
| CN114015111A (en) * | 2021-11-30 | 2022-02-08 | 中国科学院兰州化学物理研究所 | Flexible eutectic gel, preparation method and application thereof, and strain sensor |
| CN115219078A (en) * | 2022-06-08 | 2022-10-21 | 中山大学 | Piezoresistive sensor based on locust bean gum hydrogel and preparation method and application thereof |
-
2022
- 2022-10-27 CN CN202211329768.4A patent/CN115678188B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109251451A (en) * | 2018-08-30 | 2019-01-22 | 太原理工大学 | A kind of preparation method of pH responsive type xanthan gum/polyvinyl alcohol hydrogel |
| CN111053925A (en) * | 2019-12-02 | 2020-04-24 | 侯槿瑄 | Conductive hydrogel and exercise rehabilitation sensor manufacturing method based on conductive hydrogel |
| CN112210114A (en) * | 2020-10-27 | 2021-01-12 | 福州大学 | Preparation method of ultrahigh-strength multifunctional polyvinyl alcohol-based oil gel elastomer |
| CN114015111A (en) * | 2021-11-30 | 2022-02-08 | 中国科学院兰州化学物理研究所 | Flexible eutectic gel, preparation method and application thereof, and strain sensor |
| CN115219078A (en) * | 2022-06-08 | 2022-10-21 | 中山大学 | Piezoresistive sensor based on locust bean gum hydrogel and preparation method and application thereof |
Non-Patent Citations (2)
| Title |
|---|
| Synthesis and performance characterization of poly(vinyl alcohol)-xanthan gum composite hydrogel;Q. Zhang，et al.;《Reactive and Functional Polymers》;第34-43页 * |
| 张倩.《药用高分子材料学》.四川大学出版社,2021,(第第1版版),第111-112页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115678188A (en) | 2023-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Huang et al. | A double-layer carbon nanotubes/polyvinyl alcohol hydrogel with high stretchability and compressibility for human motion detection | |
| Yang et al. | Highly stretchable and sensitive conductive rubber composites with tunable piezoresistivity for motion detection and flexible electrodes | |
| Yu et al. | Carbon Dots‐Based Ultrastretchable and Conductive Hydrogels for High‐Performance Tactile Sensors and Self‐Powered Electronic Skin | |
| CN106971862B (en) | Polyelectrolyte in energy storage devices, products, and uses thereof | |
| Li et al. | Carboxymethyl cellulose assisted polyaniline in conductive hydrogels for high-performance self-powered strain sensors | |
| Wang et al. | An all-in-one supercapacitor with high stretchability via a facile strategy | |
| CN112229317A (en) | Flexible sensing film with large deformation performance and monitoring function and preparation method thereof | |
| CN111944167B (en) | Conductive hydrogel and preparation method and application thereof | |
| Hu et al. | Fabrication of stretchable multi-element composite for flexible solid-state electrochemical capacitor application | |
| Xue et al. | Wearable and visual pressure sensors based on Zn 2 GeO 4@ polypyrrole nanowire aerogels | |
| WO2023019676A1 (en) | Stretchable, compressible and antifreezing organic hydrogel electrolyte, preparation method and application | |
| Li et al. | A stretchable and self-healable conductive hydrogels based on gelation/polyacrylamide/polypyrrole for all-in-one flexible supercapacitors with high capacitance | |
| CN113861538A (en) | Self-repairing conductive ring oxidized natural rubber composite material and preparation method thereof | |
| CN115219078A (en) | Piezoresistive sensor based on locust bean gum hydrogel and preparation method and application thereof | |
| CN111073302B (en) | Preparation method of full-flexible stretching sensor suitable for 3D printing | |
| CN115678188B (en) | Xanthan gum hydrogel and preparation method and application thereof | |
| Wang et al. | Stretchable and compressible conductive foam based on Cu nanowire/MWCNT/ethylene-vinyl acetate composites for high-mass-loading supercapacitor electrode | |
| CN109378110B (en) | Preparation method of cellulose/graphene nanosheet flexible conductive composite material with piezoresistive sensing performance | |
| Wang et al. | Fabrication of an ion-enhanced low-temperature tolerant graphene/PAA/KCl hydrogel and its application for skin sensors | |
| Ma et al. | Preparation of a multifunctional organogel and its electrochemical properties | |
| CN110863352B (en) | High-tensile flexible strain sensor based on double-component polyurethane wire and preparation method thereof | |
| CN112210114A (en) | Preparation method of ultrahigh-strength multifunctional polyvinyl alcohol-based oil gel elastomer | |
| JP2022517258A (en) | Dynamically bound supramolecular polymer for stretchable batteries | |
| CN114438617B (en) | ANF/CNT/PPy aerogel fiber sensor and preparation method and application thereof | |
| CN113336971B (en) | Nano-structure polyaniline composite hydrogel and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |