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On-off surface active particle utilizing temperature as trigger mechanism

A technology of surface activity and trigger mechanism, applied in dissolution, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of complex preparation of switchable surfactants, inconvenient application, harsh trigger conditions of switchable surface active particles, etc.

Active Publication Date: 2016-05-04
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However CO 2 / N 2 The preparation of switching surfactants is still relatively complicated, and this CO 2 / N 2 The trigger conditions for switching surface active particles are relatively harsh
Usually, it is necessary to pass CO at a lower temperature (0-5°C) to open its surface activity. 2 , while turning off its surface activity requires passing N at a higher temperature (65°C) 2 , and it takes a long time (50-80min), which brings inconvenience to related applications

Method used

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  • On-off surface active particle utilizing temperature as trigger mechanism
  • On-off surface active particle utilizing temperature as trigger mechanism
  • On-off surface active particle utilizing temperature as trigger mechanism

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Surface Activity Test of Nano-Silicon Dioxide Particles. Weigh 0.035g commercial nano silicon dioxide particles (HL-220, the primary particle diameter is about 20nm (see figure 1 ), BET specific surface area 200m 2 / g, produced by Wuxi Jinding Longhua Chemical Co., Ltd.), put it into a 25mL vial, add 7mL of pure water, and disperse the particles in water with an ultrasonic disperser (JYD-650, Shanghai) (50W, 1min). The concentration of particles is 0.5% by mass (relative to the aqueous phase). Add 7 mL of toluene (98%, Sinopharm Reagent) to the vial, and emulsify with a high-shear emulsifier (IKA, rotor diameter 1 cm) at 11,000 rpm for 2 min (the same below), but a stable emulsion cannot be obtained, such as figure 2 (A) shown. It shows that the commercial nano-silica particles used do not have surface activity.

Embodiment 2

[0023] Example 2: In-situ hydrophobization (surface activation) of nano-silica particles by nonionic surfactants containing short EO chains. With lauryl alcohol polyoxyethylene (5) ether (C 12 E. 5 , each molecule contains 5 polyoxyethylene units, Singma company product) prepare a series of aqueous solutions with different concentrations, take 7mL respectively and put them into 25mL vials, add 7mL toluene, and emulsify with a high-shear emulsifier for 2min, it can be seen that when C 12 E. 5 Concentration at 1.0×10 -5 to 1.0×10 -3 mol / L range (cmc=5.6×10 -5 mol / L), neither can form a stable emulsion, such as figure 2 (B) shown. However, if 0.035g of nano-silica particles are ultrasonically dispersed in the above C 12 E. 5 Add 7 mL of dodecane to the dilute aqueous solution, and emulsify with a high-shear emulsifier for 2 minutes to obtain a stable O / W Pickering emulsion, which has basically no change in appearance after standing for a week, as shown in figure 2 As ...

Embodiment 3

[0024] Example 3: In-situ hydrophobization (surface activation) of nano-silica particles by nonionic surfactants containing short EO chains. Polyoxyethylene lauryl alcohol (3) ether (C 12 E. 3 , each molecule contains 3 polyoxyethylene units, synthesized in the laboratory) Prepare a series of aqueous solutions with different concentrations, take 7mL and put them into 25mL vials, add 7mL toluene, emulsify with a high-shear emulsifier for 2min, it can be seen that when C 12 E. 3 Concentration at 1.0×10 -4 to 6.0×10 -2 mol / L range, can not form a stable emulsion, such as Figure 4 (A) shown. However, if 0.035g of nano-silica particles are ultrasonically dispersed in the above C 12 E. 3 Add 7 mL of dodecane to the dilute aqueous solution, and emulsify with a high-shear emulsifier for 2 minutes, then when C 12 E. 3 Concentration greater than 1.0×10 -3 mol / L, a stable O / W Pickering emulsion can be obtained, which remains stable after being placed for a week, and its appea...

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Abstract

The invention provides an on-off surface active particle utilizing temperature as a trigger mechanism and belongs to the field of colloid and interface chemistry. The on-off surface active particle consists of non-modified nanosilicon dioxide particles and nonionic amphiphilic products containing short polyoxyethylene chains, wherein the native grain size of each particle is 10-200nm, the use concentration is 0.1-2.0 in mass fraction (the water phase is taken as reference), the polyoxyethylene element number of the nonionic amphiphilic products is 2-6, and the use concentration is 0.01-1.0 times that of critical micelle concentration (the water phase is taken as reference). Nonionic amphiphilic products are absorbed to the surfaces of particles by virtue of hydrogen-bond interaction between ether oxygen atoms of the nonionic amphiphilic products and silicon hydroxyls on the surfaces of the particles in a water medium at a room temperature, so that the surfaces of the particles are subjected to in-situ hydrophobization, and thus the particles have surface activity; when temperature raises to be above the turbidity point temperature of nonionic, hydrogen bonds are broken, the nonionic is desorbed from the surfaces of the particles, the particles lose surface activity; when the temperature returns to the room temperature, the hydrogen-bond interaction recovers, and the particles have surface activity again.

Description

technical field [0001] The invention relates to a switchable surface active particle with temperature as a trigger mechanism, which belongs to the field of colloid and interface chemistry. Background technique [0002] Emulsification and demulsification are important in everyday life as well as in industry and technology. For example, some products such as food, cosmetics, pesticide preparations, etc. are themselves emulsions and require to be stable, while on the other hand, some emulsions such as crude oil emulsions are not expected to be stable and require rapid demulsification. There are also occasions where it is desirable for the emulsion to remain temporarily stable, that is, to remain stable for a certain period of time, and then require breaking. For example, in emulsion polymerization, the emulsion is required to be stable during the polymerization stage, but after the polymerization reaction is completed, the emulsion is required to break quickly so that the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/00C09K23/00
CPCC09K23/002C09K23/00C09K23/017
Inventor 崔正刚朱玥付婷蒋建中裴晓梅宋冰蕾
Owner JIANGNAN UNIV
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