CN107343505B - Carbon nanotube composite structure with silicon dioxide nano-particles and silver nano-particles - Google Patents

Carbon nanotube composite structure with silicon dioxide nano-particles and silver nano-particles Download PDF

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CN107343505B
CN107343505B CN201610296576.6A CN201610296576A CN107343505B CN 107343505 B CN107343505 B CN 107343505B CN 201610296576 A CN201610296576 A CN 201610296576A CN 107343505 B CN107343505 B CN 107343505B
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nano
carbon nanotube
walled carbon
edas
sio
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CN107343505A (en
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赖鸿政
黄俐恬
李依霖
林正崧
张曾隆
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Hon Hai Precision Industry Co Ltd
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Shih Hua Technology Ltd
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16Heavy metals; Compounds thereof
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00Nanotechnology for materials or surface science, e.g. nanocomposites

Abstract

A carbon nanotube composite structure with silica nanoparticles and silver nanoparticles, having high moisture retention and high bactericidal properties, comprising: a modified multi-wall carbon nanotube (MWCNT), wherein the carbon radical of the benzene ring is combined with functional groups of COOH, OH and SO, SO that the modified multi-wall carbon nanotube becomes a nano structure with negative charges on the surface; an adhesion layer with polarity, which adheres to the modified multi-walled carbon nanotube with its surface charge, comprising: multiple SiO2The surface potential of the @ EDAS nano-particles has positive charges, and can be attracted with the modified multi-walled carbon nanotube to form a composite structure. A plurality of Ag @ Citrate nano molecules, the surfaces of which are negatively charged and the volume of which is far less than that of the SiO2@ EDAS nano-particles, and the electrical property is opposite, the Ag @ Citrate nano-molecules form a multi-layer composite structure along with the attachment on the surface of the modified multi-wall carbon nano-tube. Because silver ions have high sterilization effect, the modified multi-walled carbon nanotube adhered with the adhesive layer also has sterilization effect.

Description

Carbon nanotube composite structure with silicon dioxide nano-particles and silver nano-particles
Technical Field
The present invention relates to a carbon nanotube composite structure, and more particularly, to a carbon nanotube composite structure having silica nanoparticles and silver nanoparticles with high moisture retention and high bactericidal properties.
Background
A Carbon Nanotube (abbreviated CNT) is a tubular Carbon molecule, in which each Carbon atom takes the form of sp2And mixing the two materials, and combining the two materials by carbon-carbon sigma bonds to form a honeycomb structure consisting of hexagons as a framework of the carbon nanotube. Wherein a pair of p electrons not participating in mixing on each carbon atom of the carbon nanotube form a conjugated pi electron cloud between each other across the entire carbon nanotube. Carbon nanotubes can be classified into single-walled carbon nanotubes and modified multi-walled carbon nanotubes according to the number of layers of the tubes. The carbon nanotubes are very thin in the radial direction, only in the nanometer scale, and can be as long as tens of microns to hundreds of microns in the axial direction.
By utilizing the properties of the carbon nanotubes, a plurality of composite materials with excellent performance can be prepared. Biologically, the carbon nanotube can generate cell regeneration effect and absorb infrared ray, so that it has high potential in thermotherapy. Therefore, the inventor of the present invention hopes to apply the carbon nanotubes in the biomedical field, especially the application of the wound sterilization material as the priority, but the biomedical material is often required to have the functions of effectively moisturizing and sterilizing. The moisture retention is realized by adsorbing and maintaining the moisture through the modified amino group on the silicon material, and the sterilization can be realized by the silver nano particles. The unmodified carbon nanotube itself has no effective moisture and no bactericidal property, and the silver bactericidal material sold in the market is mostly attached to the carbon nanotube by coating, and cannot be effectively, stably and properly combined on the carbon nanotube, and the shedding phenomenon is also obvious.
Therefore, the present invention is to provide a carbon nanotube composite structure using carbon nanotubes as a substrate, and combining silicon materials with high moisture retention and silver nanoparticles with bactericidal properties, so as to solve the defects of the current industrial technology.
Disclosure of Invention
Therefore, the present invention is directed to solving the above-mentioned problems of the prior art, and the present invention provides a carbon nanotube composite structure with silica nanoparticles and silver nanoparticles having high moisture retention and high bactericidal properties, wherein a plurality of SiO with positive charges on the surface are used2@ EDAS nanoparticles adsorbed to COOH, OH, SO bound to the carbon group of the benzene ring of a modified multi-walled carbon nanotube (MWCNT)3H and other functional groups, and a plurality of Ag @ Citrate nano molecules with negative charges on the surface are adsorbed and surrounded on the SiO2@ EDAS nanoparticles. Because of the SiO2The @ EDAS nano-particles are attached to the modified multi-walled carbon nanotube, so the Ag @ Citrate nano-molecules are also attached to the surface of the modified multi-walled carbon nanotube. Wherein the SiO2The application of surface amino group to the @ EDAS nano particle can make water have firmer adsorption effect so as to achieve the purpose of moisturizing. And the silver ions have high sterilization effect, so that the modified multi-walled carbon nanotube adhered with the adhesive layer also has sterilization effect. Thus, in the case of biotherapy, the nanoparticles of the present invention are usedThe carbon tube composite structure can achieve the functions of moisture retention and sterilization at the same time.
In order to achieve the above object, the present invention provides a carbon nanotube composite structure with silica nanoparticles and silver nanoparticles, which has high moisture retention and high bactericidal properties, comprising: a modified multi-wall carbon nanotube (MWCNT), wherein COOH, OH and SO are bonded on the carbon group of the benzene ring of the modified multi-wall carbon nanotube3A functional group of H; the method is that the original longer multi-wall carbon nano-tube passes through H2SO4And HNO3After soaking the mixed solution of (A) and (B), the HNO is made to be3Oxidizing the longer multi-walled carbon nanotubes with H2SO4The dehydration property is applied, so that the longer multi-walled carbon nanotube generates the functional group; and the surface of the longer multi-walled carbon nanotube is defective due to chemical reaction in the oxidation process to generate new functional groups, thereby generating chemical bond changes and fractures to influence the structure of the longer multi-walled carbon nanotube and shorten the whole length to form the modified multi-walled carbon nanotube, wherein COOH, OH, SO3H and other functional groups can make the surface of the modified multi-walled carbon nanotube have negative charges, so that the whole modified multi-walled carbon nanotube becomes a nano structure with negative charges on the surface; the negative surface charge caused by these functional groups can be utilized to generate the mutual adsorption effect of the particles with the polarity opposite to that of the rest charges, so as to increase the adsorption capacity of the modified multi-walled carbon nanotube.
The invention also comprises a polar adhesive layer, which is adhered on the modified multi-wall carbon nano-tube modified by acid group by using the surface charge, the adhesive layer mainly comprises: multiple SiO2@ EDAS nanoparticles in SiO2N- [3- (2-aminoethyllamino) propyl L on surface modification of nanoparticle]trimethoxysilane (EDAS) to form SiO2@ EDAS nanoparticles; the SiO2The surface of the @ EDAS nano particle has positive charges, so the nano particle can attract the modified multi-walled carbon nano tube with the negative charges on the surface to form a composite structure; SiO22@ EDAS nanoparticles having NH2Surface functional group, use of the NH2Can be mixed with water (H)2In O)Hydrogen ions form hydrogen bonds, so that water can be adsorbed more firmly; therefore, the structure can effectively adsorb water molecules to achieve the purpose of moisture preservation.
The adhesive layer also comprises a plurality of Ag @ Citrate nano molecules, and the Ag @ Citrate nano molecules are formed by reducing silver ions by using sodium Citrate as a reducing agent and generating bonds to enable a plurality of citric acid molecules to be coated around silver atomic groups; the surface of the nano molecule with the structure is in negative charge; the volume of the Ag @ Citrate nano molecule is far less than that of the SiO2The nano particles of @ EDAS and the electric properties are opposite, so the Ag @ Citrate nano molecules can be circularly adsorbed on the SiO by applying a method of heteropotential attraction2@ EDAS nanoparticles; because of the SiO2The @ EDAS nano-particles are attached to the modified multi-walled carbon nanotube, so the Ag @ Citrate nano-molecules are also attached to the surface of the modified multi-walled carbon nanotube; the Ag @ Citrate nano molecule can slowly release silver ions under the environment, and the silver ions have excellent sterilization effect, so that the modified multi-wall carbon nano tube attached with the adhesive layer also has sterilization effect.
A further understanding of the nature and advantages of the present invention will become apparent from the following description when read in conjunction with the accompanying drawings.
Drawings
FIG. 1 shows a schematic diagram of the combination of the main components of the present invention.
FIG. 2 shows a schematic diagram of the combination of elements of the present invention.
Fig. 3 shows a particle size distribution diagram of hydrated particles of SiO2 in the present invention.
FIG. 4 shows the particle size distribution of the hydrated SiO2@ EDAS particles of the present invention.
[ description of reference ]
10 modified multi-wall nano carbon tube
20 adhesive layer
21 SiO2@ EDAS nanoparticles
22 Ag @ Citrate nano-molecules.
Detailed Description
The present invention will now be described in detail with reference to the drawings, wherein the same reference numerals are used to designate the same elements, components, and advantages.
Referring to fig. 1 to 4, a carbon nanotube composite structure with silica nanoparticles and silver nanoparticles with high moisture retention and high bactericidal performance of the present invention is shown, which comprises the following components:
a modified multi-walled carbon nanotube (MWCNT)10, the modified multi-walled carbon nanotube 10 having a length of about 35 μm to about 60 μm. COOH, OH and SO are bonded on the carbon radical of the benzene ring of the modified multi-walled carbon nanotube 103H, a functional group. The method is that the original longer multi-wall carbon nano-tube (the length is about 300 mu m) passes through H2SO4And HNO3After soaking the mixed solution of (A) and (B), the HNO is made to be3Oxidizing the longer multi-walled carbon nanotubes, and the H2SO4The dehydration properties are applied, thus allowing the longer multi-walled carbon nanotubes to develop the above-mentioned functional groups. In the oxidation process, the surface of the long multi-walled carbon nanotube has defects due to chemical reaction to generate new functional groups, thereby causing chemical bond changes and fractures to affect the structure of the long multi-walled carbon nanotube and shorten the overall length to form the modified multi-walled carbon nanotube 10, wherein COOH, OH, SO3The functional groups such as H can make the surface of the modified multi-walled carbon nanotube 10 have negative charges, so that the whole modified multi-walled carbon nanotube 10 becomes a nano structure with negative charges on the surface. The negative surface charges caused by these functional groups can be utilized to generate the mutual adsorption effect of the particles with the polarity opposite to that of the rest charges, so as to increase the adsorption capacity of the modified multi-walled carbon nanotube 10.
An adhesion layer 20 with polarity, which is adhered to the modified multi-walled carbon nanotube 10 modified by acid group by applying the surface charge, wherein the adhesion layer 20 mainly comprises:
multiple SiO2@ EDAS nanoparticle 21 in SiO2N- [3- (2-aminoethyllamino) propyl L on surface modification of nanoparticle]trimethoxysilane (EDAS) to form SiO2@ EDAS nanoparticle 21. Wherein the SiO2The size of the @ EDAS nanoparticles 21 is approximately 200nm in size. The SiO2@EThe surface potential of the DAS nanoparticles 21 is shown to have positive charges, so it can attract the modified multi-walled carbon nanotubes 10 with negative charges on the surface to form a composite structure.
SiO2@ EDAS nanoparticle 21 surface having NH2Bond, use of the NH2Can be mixed with water (H)2O), so that water can be adsorbed more stably, and the moisture can be preserved by the more stable adsorption of the hydrophilic silicon material and water molecules. Therefore, the structure can effectively adsorb water molecules to achieve the purpose of moisture preservation.
The adhesion layer 20 further includes a plurality of Ag @ Citrate nano-molecules 22, and the Ag @ Citrate nano-molecules 22 are formed by reducing silver ions with sodium Citrate as a reducing agent and generating bonds to coat a plurality of citric acid molecules around silver atomic groups. The surface of the nano molecule with the structure is negatively charged. As shown in FIG. 1, the size of the Ag @ Citrate nano-molecules 22 is generally about 10 to 20 nm, and their volume is much smaller than that of the SiO2The @ EDAS nano-particles 21 and the opposite electric properties, therefore, the Ag @ Citrate nano-molecules 22 will be adsorbed around the SiO by using the method of anisotropic attraction2@ EDAS nanoparticle 21. Because of the SiO2The @ EDAS nano-particles 21 are attached to the modified multi-walled carbon nanotube 10, so the Ag @ Citrate nano-molecules 22 are also attached to the surface of the modified multi-walled carbon nanotube 10 to form a multi-layer composite structure.
The Ag @ Citrate nano-molecule can slowly release silver ions under the environment, and the silver ions have excellent sterilization effect, so that the modified multi-walled carbon nanotube 10 attached with the adhesive layer 20 also has sterilization effect.
With the above structure, as shown in FIG. 2, the Ag @ Citrate nano-molecule 22 is adsorbed on the SiO2Around the @ EDAS nano-particles 21, and the effect of electric attraction makes the SiO2The @ EDAS nano-particles 21 are attached to the modified multi-walled carbon nanotube 10, so that the Ag @ Citrate nano-molecules 22 are also attached to the modified multi-walled carbon nanotube 10. If the SiO is not used2@ EDAS nanoparticle 21, it is impossible to nanosome Ag @ CitrateThe molecules 22 are adsorbed onto the modified multi-walled carbon nanotubes 10. Therefore, in the present invention, the modified multi-walled carbon nanotube 10 contains the SiO2The @ EDAS nano particles 21 and the Ag @ Citrate nano molecules 22 have the effects of moisturizing and sterilizing at the same time.
The efficacy measured by the experiment is shown in fig. 3 and 4. SiO is shown in FIG. 32Wherein the mean value of the particle diameter is 126nm, and in FIG. 4, SiO is shown2The hydrated particle size of @ EDAS is about 400nm, and the SiO synthesized by the invention2About 120 to 160nm in size, and modifying SiO generated by EDAS2The particle size of @ EDAS is about 110-200 nm, and SiO is visible2Poor adsorption capacity for water molecules and reaction at its smaller hydration radius, whereas SiO2@ EDAS has a particle size of about 400nm after hydration, and it can be seen that its peripheral functional groups readily adsorb and react with water molecules at its significantly increased hydration radius, so that the present invention can indeed effectively adsorb water molecules and improve moisture retention. In addition, the inventors also made experiments to clearly show that the upper and lower surfaces of the MWCNT do exhibit negative potentials.
In conclusion, the humanized body-paste design of the invention is quite in line with the actual requirements. The method has the advantages of obvious breakthrough and improvement on the existing defects compared with the prior art, really has the improvement on the efficiency and is not easy to achieve. The invention is not disclosed or disclosed in domestic and foreign literature and markets, and conforms to the patent law.
The above detailed description is specific to one possible embodiment of the present invention, but the embodiment is not intended to limit the scope of the present invention, and equivalent implementations or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (4)

1. A carbon nanotube composite structure with silica nanoparticles and silver nanoparticles, having high moisture retention and high bactericidal properties, comprising:
a modified multi-wall carbon nanotube, wherein C is bonded to the carbon group of the benzene ringOOH,OH,SO3A functional group of H; the method is that the original longer multi-wall carbon nano-tube passes through H2SO4And HNO3After soaking the mixed solution of (A) and (B), the HNO is made to be3Oxidizing the longer multi-walled carbon nanotubes with H2SO4The dehydration property is applied, so that the longer multi-walled carbon nanotube generates the functional group; and the surface of the longer multi-walled carbon nanotube is defective due to chemical reaction in the oxidation process to generate new functional groups, thereby generating chemical bond changes and fractures to influence the structure of the longer multi-walled carbon nanotube and shorten the whole length to form the modified multi-walled carbon nanotube, wherein COOH, OH, SO3H and other functional groups can make the surface of the modified multi-walled carbon nanotube have negative charges, so that the whole modified multi-walled carbon nanotube becomes a nano structure with negative charges on the surface; the negative surface charge caused by the functional groups can be utilized, and the particles with the polarity opposite to that of the rest charges can generate the mutual adsorption effect, so as to increase the adsorption capacity of the modified multi-walled carbon nanotube;
also includes a polar adhesive layer, which is adhered on the modified multi-wall carbon nano-tube modified by acid group by using the surface charge, the adhesive layer includes:
multiple SiO2@ EDAS nano-particles in SiO2N- [3- (2-aminoethyllamino) propyl on surface modification of nano-fluid]trimethoxysilane (EDAS) to form SiO2@ EDAS nanofluidics; the SiO2The surface of the @ EDAS nano fluid has positive charges, so the fluid can attract the modified multi-walled carbon nano tube with the negative charges on the surface to form a composite structure;
SiO2@ EDAS nanofluid surface with NH2Bond, use of the NH2Can be mixed with water (H)2The hydrogen ions in O) form hydrogen bonds, so that water can be adsorbed more stably, and the moisture can be preserved by the more stable adsorption of the hydrophilic silicon material and water molecules; therefore, the structure can effectively adsorb water molecules to achieve the purpose of moisture preservation;
the adhesive layer further comprises a plurality ofThe Ag @ Citrate nano molecule is formed by reducing silver ions by using sodium Citrate as a reducing agent and generating bonds so that a plurality of citric acid molecules are coated around silver atomic groups; the surface of the nano molecule with the structure is in negative charge; the volume of the Ag @ Citrate nano molecule is far less than that of the SiO2The nano-particles of @ EDAS and the electric properties are opposite, so the nano-particles of Ag @ Citrate are adsorbed around the SiO by means of the heteropotential attraction2@ EDAS nanofluidics; because of the SiO2The @ EDAS nano-fluidic is attached to the modified multi-walled carbon nanotube, so the Ag @ Citrate nano-molecule is also attached to the surface of the modified multi-walled carbon nanotube;
the Ag @ Citrate nano molecule can slowly release silver ions under the environment, and the silver ions have strong sterilization effect, so that the modified multi-wall carbon nano tube attached with the adhesive layer also has the sterilization effect.
2. The carbon nanotube composite structure with silica nanoparticles and silver nanoparticles according to claim 1, wherein the modified multi-walled carbon nanotubes have a length of 35 μm to 60 μm.
3. The carbon nanotube composite structure with silica nanoparticles and silver nanoparticles according to claim 1, wherein the SiO has high moisture retention and high bactericidal activity2The size of the @ EDAS nanofluidier is 200 nm.
4. The carbon nanotube composite structure with silica nanoparticles and silver nanoparticles according to claim 1, wherein the size of the Ag @ Citrate nano-molecule is 10 to 20 nm.
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