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Pickering emulsion gel based on mutual attraction of liquid drops and preparation method of Pickering emulsion gel

A technology of mutual attraction and emulsion gel, which is applied in the field of new materials, can solve problems such as the inability to form a three-dimensional cross-linked network and the instability of the oil-gel system, and achieve the effects of strong versatility, strong stability, and good stability

Active Publication Date: 2020-05-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of electrostatic attraction and other interactions in the oil phase, materials such as polymers and colloidal particles cannot form a three-dimensional crosslinked network, and the prepared oil-gel system containing dispersed water droplets is usually unstable.

Method used

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  • Pickering emulsion gel based on mutual attraction of liquid drops and preparation method of Pickering emulsion gel
  • Pickering emulsion gel based on mutual attraction of liquid drops and preparation method of Pickering emulsion gel
  • Pickering emulsion gel based on mutual attraction of liquid drops and preparation method of Pickering emulsion gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: Preparation of Pickering emulsion gel based on mutual attraction of droplets (shellac nanoparticles-diamine-terminated silicone oil / silk oil system) and gel property test

[0062] (1) Disperse shellac nanoparticles in water to prepare a dispersion of shellac nanoparticles with a concentration of 0.8 mg / ml; dissolve diamino-terminal silicone oil in silk oil to prepare 10 mg / ml of diamino-terminal silicone oil / silk oil , then shake well.

[0063] (2) Draw 1.6ml of the water phase and 0.4ml of the oil phase into the glass bottle, then shake until the mixture turns into a viscous emulsion. After standing for 1 hour, the emulsion forms a gel. Turn the glass bottle upside down, and the emulsion gel will not flow, as attached figure 1 And attached figure 2 (a) shown.

[0064] (3) According to the method in steps (1) and (2), add a small amount of Nile Red to the oil phase to prepare a Pickering gel based on the mutual attraction of droplets, and use a confocal m...

Embodiment 2

[0066] Example 2: Properties of Pickering emulsion gels based on mutual attraction of droplets

[0067] (1) Rheological properties: According to the method in Example 1, the Pickering emulsion gel based on the mutual attraction of droplets is prepared by using an oil-water ratio of 1:4, and the obtained emulsion gel based on the flat plate system of a rotational rheometer is used to measure rheological properties. The results of the temperature scan are attached image 3 As shown in (a), the storage modulus, dissipation modulus, and viscosity of the gel are basically unchanged with the increase of temperature, indicating that the obtained Pickering based on the mutual attraction of droplets is as good as that of the gel at 20°C-50°C in one day. Good stability. The results of the strain scan are attached image 3 As shown in (b), the storage modulus of the gel decreases exponentially at a strain of 10%, the dissipation modulus rises at 8%, then falls and intersects the stora...

Embodiment 3

[0078] Example 3: Underwater 3D printing of gel

[0079] (1) According to the method in Example 1, the Pickering emulsion gel based on the mutual attraction of droplets was prepared using an oil-water ratio of 1:4.

[0080] (2) Pour the gel into the syringe, push the syringe through the syringe pump to extrude the gel, then use a plastic tube to connect the syringe and the needle of the 3D printer, and extend the needle of the 3D printer into a container filled with water in, as attached Figure 10 (a) shown.

[0081] (3) Design the model through software modeling and slice it to obtain the printing path.

[0082] (4) Use a syringe pump to control the extrusion speed of the gel, and a 3D printer to control the path of the needle, which can print out the required 2D patterns and 3D models underwater, as shown in the attached Figure 10 (b) and (c) shown.

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Abstract

The invention discloses a Pickering emulsion gel based on mutual attraction of liquid drops and a preparation method of the Pickering emulsion gel. According to the method, nanoparticles with negativeelectricity are dispersed in water to serve as a water phase, a double-ammonia-terminal polymer with positive electricity is dissolved in oil to serve as an oil phase, and the water phase is emulsified in the oil phase through methods such as shaking, oscillating or homogenizing. In the emulsification process, the nanoparticles are adsorbed to a water-oil interface to form a Pickering emulsion; meanwhile, the double-ammonia-terminal polymer is also adsorbed to a water-oil interface; amino groups at the two ends of part of the polymer can be adsorbed to water-oil interfaces of two adjacent liquid drops respectively and attract nano-particles with negative electricity through electrostatic interaction, so that the two adjacent liquid drops are connected together, and the Pickering emulsiongel with the cross-linked liquid drops is formed. The novel emulsion gel is good in stability and high in universality, can be used as a template for developing novel materials such as porous materials and 3D printing materials, and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a Pickering emulsion gel based on mutual attraction of droplets and a preparation method thereof. Background technique [0002] Gel is usually composed of polymer or colloidal particles in the medium connected to each other under certain conditions to form a three-dimensional space network structure, so that the system cannot flow freely and becomes a semi-solid state, so it has certain viscoelasticity and mechanical strength. The emulsion gel is a special gel system, and the gel medium usually contains dispersed water droplets or dispersed oil droplets. Because of its special structure and properties, emulsion gel has a wide range of applications in biomedicine, new materials and other fields. [0003] Existing emulsion gels are mainly hydrogel systems containing dispersed oil droplets. For example, cosmetic creams use emulsification methods such as ultrasound and homogenization t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/24C08J3/075C08L51/00C08L51/08C08L93/02
CPCC08J3/075C08J3/24C08J9/28C08J2201/0504C08J2205/052C08J2351/00C08J2351/08C08J2493/02
Inventor 陈东孔琳琳吴柏衡杨晨静王行政孙竹
Owner ZHEJIANG UNIV
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