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A pH-responsive emulsion

An emulsion and reaction technology, applied in the field of emulsion, can solve the problems of difficult emulsion breaking and low surfactant concentration

Active Publication Date: 2021-05-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pickering emulsion has the advantages of low surfactant concentration (0.1cmc), super long stability (stable for more than 3 months), etc., but its demulsification is more difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: the preparation of tensio-active agent (N-C 16 -N + )

[0052]

[0053] (1) Acid chlorination reaction: Add hexadecanedioic acid solid (25g, 0.087mol) into a three-necked flask equipped with a device for absorbing tail gas and a reflux condenser, and add three drops of N,N-dimethylformamide as Catalyst, slowly dropwise add thionyl chloride (26g, 0.22mol). The reaction temperature was 60°C, and the reaction was carried out for 1 hour. Excess thionyl chloride was removed by rotary evaporation to obtain product 1.

[0054] (2) Amidation reaction: Place dimethylamine aqueous solution (154g, 1.37mol) in an ice-water bath, add dropwise a dichloromethane solution of product 1 (25g, 0.077mol), react for 2 hours after completion, and then use Dichloromethane was extracted 5 times, the combined extracts were washed with anhydrous Na 2 SO 4 The excess water was removed, the filtrate was obtained by suction filtration, the filtrate was rotary evaporated, and r...

Embodiment 2

[0058] Embodiment 2: Nano Al 2 o 3 Surface Activity Detection of

[0059] Weigh 0.01g commercial nano-Al 2 o 3 Particles (primary particle size is about 13nm ( image 3 The shown SEM and TEM)) were placed in a 200mL bottle, 100g of ultrapure water was added, and dispersed in water with an ultrasonic disperser. The concentration of the particles is 0.01% by mass fraction (relative to the water phase). Pipette 7g of the particle solution into a 25mL bottle, add 7mL of n-decane, and emulsify with a high-shear homogenizer at a speed of 11000r / s for 2min, but no stable emulsion, indicating that the commercial nano-Al 2 o 3 Not surface active.

Embodiment 3

[0060] Embodiment 3: the preparation of novel emulsion

[0061] Weigh 0.0007g of nano-Al 2 o 3 Particles were ultrasonically dispersed in 7g of N-C with different concentrations 16 -N + (from left to right, 0.003mM, 0.006mM, 0.01mM, 0.03mM, 0.06mM, 0.1mM) solution, add 7mL of n-decane, emulsify with a high shear homogenizer for 2min, get Stable novel emulsions, such as Figure 4 As shown, this emulsion is still a stable emulsion after being placed for one month, and the appearance has no obvious change, indicating that the new emulsion obtained has better stability.

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Abstract

The invention discloses a novel emulsion with pH responsiveness, which belongs to the field of colloid and interface chemistry. The present invention utilizes cationic surfactant N-C with amphiphilic-strong polarity conversion 16 -N + with positively charged Al 2 o 3 The new type of emulsion formed by the joint action of the particles, through the pH trigger mechanism, makes the emulsion circulate in the process of emulsion formation and demulsification. Compared with conventional emulsions and Pickering emulsions, the emulsion of the present invention has a lower particle concentration and a lower surfactant concentration, and is cost-saving and economically beneficial; in the circulation process, the surfactant is all in the water , to realize the recovery and reuse of surfactants, which plays an important role in oil emulsification transportation, emulsion polymerization, nanomaterial synthesis and heterogeneous catalysis.

Description

technical field [0001] The invention belongs to the field of colloid and interface chemistry, and in particular relates to a pH-responsive emulsion. Background technique [0002] Emulsion is a heterogeneous mixture of two or more immiscible liquids, one of which (internal phase or dispersed phase) is dispersed in the other (external or continuous phase) in the form of droplets, mainly including Water-in-oil (W / O), oil-in-water (O / W) and multiple emulsions. Emulsions are widely used in food, cosmetics, pesticide preparations, medicine and emulsion synthesis and other fields. At the same time, emulsification and demulsification in emulsions are very important in the field of daily life and in the field of industry and technology. For example, some products such as food, cosmetics, pesticide preparations, etc. are themselves emulsions and require long-term stability. On the other hand, some emulsions such as crude oil emulsions do not want to be stable and require rapid demul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C209/08C07C211/63B01F17/00B01F17/18C09K23/00C09K23/18
CPCC07C209/08C09K23/017
Inventor 裴晓梅张盛庞淑敬宋冰蕾崔正刚
Owner JIANGNAN UNIV
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