A graphene/clay composite elastic airgel with adjustable hydrophilicity and hydrophobicity and its preparation method
A technology of graphene airgel and composite hydrogel, which is applied in the field of airgel, can solve the problems of high cost and long time for solvent removal, and achieve the effect of green environmental protection, low cost and good rebound performance in the preparation process
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example 1
[0045] Preparation Example 1 Graphene Oxide Dispersion Liquid
[0046] The graphene oxide dispersion used in the following examples can be prepared according to the improved Hummers method, and the specific steps are as follows: natural graphite, phosphorus pentoxide, potassium persulfate and concentrated sulfuric acid are according to the mass ratio of 2:1:1:10 After mixing evenly, react at 80°C for 6 hours; after the reaction, wash and dry in sequence to obtain pre-oxidized graphite; mix pre-oxidized graphite, potassium permanganate and concentrated sulfuric acid according to the mass ratio of 1:5:30 and then dry at 35 React at ℃ for 2 hours, add 700ml of water to dilute after the reaction is over, and terminate the reaction; add 30ml, 30wt% hydrogen peroxide aqueous solution to the diluted dispersion, then wash with water, dialysis and ultrasonic stripping at 150W for 120min to obtain graphite oxide ene dispersion; the concentration of the graphene oxide dispersion is 8mg m...
Embodiment 1
[0048] Graphene / attapulgite composite elastic airgel, which is prepared by the following method:
[0049] 1) Add 0.5g of attapulgite to 100g of deionized water, sonicate for 20min and then centrifuge at 1000rpm for 10min, take the upper dispersion, then sonicate for 20min, then centrifuge at 2000rpm for 10min, take the upper dispersion to obtain a concentration of 4mgml -1 Attapulgite dispersion liquid;
[0050] 2) Mix 5ml, 4mg ml -1 Attapulgite dispersion, 2.5ml of deionized water and 2.5ml, 8mg ml -1 The graphene oxide dispersion prepared in Preparation Example 1 was mixed uniformly, then 40 mg of ascorbic acid was added, and stirred and dissolved at room temperature to obtain a mixed dispersion;
[0051] 3) Heat the mixed dispersion in an oil bath at 90°C for 7 minutes, then pre-freeze at -75°C for 30 minutes, take it out, thaw it at room temperature and heat it in an oil bath at 70°C for 20 hours to obtain graphene / attapulgite Soil composite hydrogel;
[0052] 4) The g...
Embodiment 2
[0065] Graphene / sodium montmorillonite composite elastic airgel, which is prepared by the following method:
[0066] 1) Add 2.0g of sodium-based montmorillonite to 100g of deionized water, sonicate at 300W for 30min, then centrifuge at 1000rpm for 10min, take the upper dispersion, then sonicate at 300W for 30min, then centrifuge at 2000rpm for 10min, take the upper layer Dispersion to obtain a concentration of 12 mg ml -1 The sodium-based montmorillonite dispersion;
[0067] 2) Mix 1.5ml, 12mg ml -1 The sodium-based montmorillonite dispersion, 6.0ml of deionized water and 2.5ml, 8mg ml -1 The graphene oxide dispersion of Preparation Example 1 was mixed uniformly, then 40 mg of ascorbic acid was added, and stirred and dissolved at room temperature to obtain a mixed dispersion;
[0068] 3) Heat the mixed dispersion in a 90°C oil bath for 7 minutes, then pre-freeze at -75°C for 30 minutes, take it out, thaw it at room temperature and heat it in a 70°C oil bath for 20 hours to ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| pore size | aaaaa | aaaaa |
| contact angle | aaaaa | aaaaa |
| contact angle | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More