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Composite emulsifier having magnetic-responsive performance

A composite emulsifier, magnetic response technology, applied in chemical instruments and methods, chemical/physical processes, dissolution and other directions, can solve the problems of high cost, cumbersome preparation, unsuitable for industrial production, etc., achieves simple and convenient construction, and expands the preparation method. , the effect of broadening the application prospects

Active Publication Date: 2018-10-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has problems such as complicated preparation, high cost, and unsuitability for industrial production.

Method used

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  • Composite emulsifier having magnetic-responsive performance
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  • Composite emulsifier having magnetic-responsive performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Performance test of lipase stable emulsion.

[0030]Prepare a series of lipase solutions with ultrapure water. In a 25mL cylindrical vial, add 7mL lipase solution and 7mL isooctane (>99%), and emulsify with a high-shear emulsifier (IKA, rotor diameter 1cm) at 11,000rpm for 2min (the same below), Since lipase has certain interface activity, a stable emulsion can be obtained with the increase of lipase concentration. But when the concentration of lipase is low (less than 1mg·mL -1 ), the emulsion droplet size is larger and the stability is poor.

Embodiment 2

[0031] Example 2: Hydrophobic effect of lipase on the surface of nano-Fe3O4 particles.

[0032] Add 0.021g commercial nano-Fe to 7mL water 3 o 4 Particles (primary particle size about 20-200nm), disperse the particles with an ultrasonic disperser (JYD-650, Shanghai) (50W, 1min), after the nanoparticles are uniformly dispersed, add a certain concentration of lipase solution and 7mL of isooctane, Use a high-shear emulsifier to emulsify for 2 minutes to obtain an O / W Pickering emulsion. After standing for 24 hours, the appearance photos and micrographs of the emulsion are taken.

[0033] figure 2 It is the appearance of the emulsion. The upper picture is taken immediately after the emulsion is prepared, and the lower picture is taken after 24 hours. It can be seen from the picture that when the lipase concentration is not less than 0.4mg·mL -1 Emulsions co-stabilized by lipase and nanoparticles can be stabilized when .

[0034] Compare image 3 and Figure 4 It can be seen...

Embodiment 3

[0035] Example 3: Magnetic Response Verification of Pickering Emulsion

[0036] 0.021g nanometer Fe 3 o 4 Particles were ultrasonically dispersed in 7mL of water, and a certain amount of enzyme solution was added to a concentration of 1mg·mL -1 , add 7mL of isooctane, and emulsify homogeneously for 2min with a high-shear emulsifier to obtain a stable O / W Pickering emulsion. At room temperature, introduce the emulsion into Figure 6 In the device shown, after two cycles (the emulsion passes through a region with a certain magnetic field strength), the emulsion breaks after 10 minutes, and the oil and water are separated. The relevant mechanism is: nano Fe 3 o 4 The particles have super-strong paramagnetism. Under the magnetic field of the magnetic rod, the composite emulsifier originally on the oil-water interface is adsorbed to the inner wall of the device (that is, it is detached from the Pickering emulsion interface and aggregated), without the stability of the emulsifi...

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Abstract

The invention discloses a composite emulsifier having magnetic-responsive performance and belongs to the technical field of colloid and interface chemistry. The emulsifier includes commercial nano Fe3O4 particles, which are not subjected to any modification, and enzyme; original particle size of the nano Fe3O4 particles is 20-200 nm, and application concentration, on the basis of a water phase, is0.05-5.0%; the lipases are protein enzymes and nucleic acid enzymes, and application concentration, on the basis of the water phase, is 0-20 mg / ml. An emulsion stabilized by the composite emulsifierbelongs to Pickering emulsion, wherein the composite emulsifier and the emulsion stabilized thereby have magnetic-responsive performance; at room temperature, as the emulsion passes through an area having certain magnetic field intensity, the composite emulsifier can leave from the interface of the Pickering emulsion and can be gathered, thus demulsifying the emulsion, but the composite emulsifierstill has interface activity; by homogenizing the separated system, the stable Pickering emulsion can be produced again.

Description

technical field [0001] The invention relates to a composite emulsifier with magnetic response performance, which belongs to the technical field of colloid and interface chemistry. Background technique [0002] Emulsions are widely used in daily life and industry. Conventional emulsions are stabilized by surfactants or polymers, which are thermodynamically unstable systems. The stability of emulsions is poor, and the concentration of surfactants is relatively high, generally significantly greater than its critical micelle concentration cmc. The Pickering emulsion is a type of emulsion stabilized by surface active particles. Generally, the amount of emulsifier is small and has super stability, but this also makes the demulsification of the Pickering emulsion relatively difficult. In order to meet the application needs, a series of colloidal particles with on-off or stimuli-responsiveness have been developed, and the trigger mechanisms include magnetic, pH, temperature, oxidat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/00C09K23/00
CPCC09K23/017
Inventor 蒋建中张杜炎徐丽丽刘琳吕淼王龄刘运加
Owner JIANGNAN UNIV
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