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Anion responsive Pickering emulsion as well as preparation method and application thereof

An anion-responsive technology, applied in the field of anion-responsive Pickering emulsion and its preparation, can solve the problems of inability to impart functionality to materials and inapplicability of temperature-sensitive materials

Active Publication Date: 2016-09-21
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently known responsive materials mainly include temperature-sensitive materials, pH-sensitive materials, etc., but their limitations are that temperature-sensitive materials are not suitable for some emulsion systems that require a constant temperature, and common pH-sensitive materials can only be simply have to adjust the surface wettability, but cannot give new functionalities to the material

Method used

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  • Anion responsive Pickering emulsion as well as preparation method and application thereof
  • Anion responsive Pickering emulsion as well as preparation method and application thereof
  • Anion responsive Pickering emulsion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 An anion responsive Pickering emulsion (Cl - base)

[0038] The preparation method is as follows:

[0039] 1) Synthesis of hydrolyzed styrene-maleic anhydride copolymer

[0040] Add 150ml of toluene to a 250ml three-necked flask, deoxidize with nitrogen for 30min, then add 5.0g (0.051mol) of maleic anhydride (also known as maleic anhydride), stir until dissolved, then add 5.8ml (0.051mol) of styrene , Azobisisobutyronitrile 0.01g, react at 85℃ for 2h. After the completion of the reaction, it was rinsed with toluene for 3 times, filtered and dried by suction to obtain a white powder as a styrene-maleic anhydride copolymer. Take 10 g of the prepared styrene maleic anhydride copolymer, dissolve it in 90 g of 3 wt% NaOH solution, and stir at 80° C. for 3 hours to obtain a transparent solution that is an aqueous solution (10 wt%) of the styrene-maleic anhydride copolymer after hydrolysis.

[0041] 2) Preparation of phenyl-imidazolinyl Janus hollow sphere

[0042] To 15 mL...

Embodiment 2

[0051] Example 2 Anion responsiveness

[0052] Take 50mg Cl from step 4) in Example 1 - The Janus nanosheet modified with ionic liquid was ultrasonically dispersed in 25ml of water, and 1mmol of phosphomolybdic acid was added and stirred at room temperature for 2h. The precipitate obtained by centrifugation was washed three times with water, separated by centrifugation and vacuum-dried for 12 hours to obtain a white powder that is a phosphomolybdic acid-based ionic liquid functionalized Janus nanosheet. Take 21 aliquots, each is to ultrasonically disperse 2mg phosphomolybdic acid-based ionic liquid Janus nanosheets in water phase or toluene (total volume is 2ml), and adjust different oil and water ratios to form emulsions. The specific ratio relationship As shown in table 2. After the emulsion is left for 24 hours, the image acquisition results are as follows Figure 2a with Figure 2b Shown.

[0053] Table 1 Types of emulsions formed under different oil-water ratios (Cl - (Janus...

Embodiment 3B

[0065] Example 3Br - , I - , NO 3 - Or HSO 4 - -Based ionic liquid functionalized Janus nanosheet stable anion responsive emulsion

[0066] Take 50mg Cl prepared in step 4) of Example 1 - The Janus nanosheets modified with ionic liquid were dispersed in 25ml water by ultrasonic, and 1mmol NaBr was added to prepare Br - Janus nanosheet modified with ionic liquid; Br - The Janus nanosheets modified with ionic liquids are ultrasonically dispersed in the water or oil phase, and the ratio of oil to water is adjusted to form an anion-responsive Pickering emulsion.

[0067] Take 50mg Cl prepared in step 4) of Example 1 - The Janus nanosheet modified with ionic liquid was dispersed in 25ml of water by ultrasonic, and 1mmol NaI was added to prepare I - Janus nanosheets modified by ionic liquid; I - The Janus nanosheets modified with ionic liquids are ultrasonically dispersed in the water or oil phase, and the ratio of oil to water is adjusted to form an anion-responsive Pickering emulsion.

[...

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Abstract

The invention discloses an anion responsive Pickering emulsion. The emulsion is prepared from ionic liquid modified sheet materials which are taken as a particle emulsifier, have different front and back surface properties and are dispersed on an interface of a water phase and an oil phase; one side of the particle emulsifier is a lipophilic group, and the other side is an ionic liquid functional group. According to the emulsion, the ionic liquid functional group has an anion exchangeable characteristic and can adjust the surface wettability while being endowed with functionalization after the anion exchange, and accordingly, the sheet materials have adjustable emulsifying performance; anion control functionalization and phase inversion are performed according to the characteristic that types of the stabilized emulsion are different due to different physicochemical properties of ionic liquid base materials containing different anions in the specific oil-water proportion, and the emulsion has broader application potentiality.

Description

Technical field [0001] The invention relates to an anion responsive Pickering emulsion and a preparation method thereof. Background technique [0002] Pickering emulsion refers to an emulsion stabilized by fine particles. Traditional Pickering particles usually use materials with a three-phase contact angle of 90 degrees, that is, extremely hydrophilic or extremely lipophilic materials are not suitable for preparing Pickering emulsions. In recent years, the emergence of anisotropic Janus tablets has allowed people to conduct further research in this field, that is, one side of the tablet can be made hydrophilic and the other side is lipophilic. When emulsified, these Janus tablets are hydrophilic to the water side. The lipophilic base is arranged to the oil side. [0003] Reversal is a relatively common feature in Pickering emulsions. It refers to the phenomenon that the continuous and dispersed phases of the emulsion change when some conditions or experimental parameters change....

Claims

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Application Information

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IPC IPC(8): B01F3/08C08F212/08C08F222/08C08F8/12C08J3/07C08K3/36C08L35/06
CPCC08F8/12C08J3/07C08K3/36C08J2491/06C08J2335/06B01F23/4146B01F23/4105B01F23/41C08F212/08C08F222/08
Inventor 孟庆博王真真杨鹏冯天阳梁福鑫杨振忠宋溪明
Owner LIAONING UNIVERSITY
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