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Composite emulsifier with double stimulus-response performance

A dual-stimuli-response, compound emulsifier technology, applied in chemical instruments and methods, chemical/physical processes, dissolution, etc., to achieve high efficiency

Active Publication Date: 2016-05-04
无锡颐景丰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this use of a single CO 2 / N 2 The Pickering emulsion prepared by the trigger mechanism can only control its emulsification or demulsification performance accordingly, but fails to achieve more precise control of emulsion morphology and droplet size in the new high-tech field

Method used

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  • Composite emulsifier with double stimulus-response performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: CO 2 / N 2 - Performance test of light dual stimulus-responsive surfactant stable emulsion. Disperse the surfactant intermediate in ultrapure water (resistance = 18.2Ω), pass CO 2 Gas, when the solution is clear, dilute to a series of concentrations. In a 25mL cylindrical vial, add 7mL of aqueous surfactant solution (concentration99%), and emulsify with a high-shear emulsifier (IKA, rotor diameter 1cm) at 11,000rpm 2min (the same below), a stable emulsion cannot be obtained, as shown in the figure. It shows that the surfactant cannot stabilize the emulsion when the concentration is less than the CMC.

Embodiment 2

[0019] Example 2: CO 2 / N 2 -Surface activation of nano-silica particles by light dual stimulus-responsive surfactants. Take 7mL of surfactant aqueous solutions with a series of concentrations and put them into 25mL columnar vials, add 0.035g of commercial nano-silica particles (HL-220, the primary particle size is about 20nm, and the BET specific surface area is 200m 2 / g, produced by Wuxi Jinding Longhua Chemical Co., Ltd.), disperse the particles (50W, 1min) with an ultrasonic disperser (JYD-650, Shanghai), add 7mL of n-decane, emulsify with a high-shear emulsifier for 2min, and obtain stable O / W type Pickering emulsion, the appearance photos and micrographs of the emulsion were taken after standing for one week. image 3 The micrographs show that, with separate CO 2 / N 2 -Compared with photoactive dual-stimuli-responsive surfactants, nanoparticles and very low concentrations of surfactants can stabilize emulsions, and the diameter of emulsion beads is 100-500 μm, which...

Embodiment 3

[0020] Example 3: CO of Pickering Emulsions 2 / N 2Responsive validation. Ultrasonically disperse 0.035g of nano-silica particles in 7mL of surfactant aqueous solution (concentration: 0.01mM), add 7mL of n-decane, and homogeneously emulsify with a high-shear emulsifier for 2min to obtain a stable O / W Pickering emulsion liquid. Place the emulsion in a water bath at 70 °C and bubble N into it 2 After one hour, the emulsion breaks and the oil and water separate. The relevant mechanism is: heating and bubbling N 2 The surfactant in the bicarbonate state decomposes and becomes a surface-free intermediate state, which desorbs from the surface of the silica particles, so the particles become too hydrophilic, lose surface activity, and desorb from the oil / water interface back to the surface. to the water phase, the emulsion breaks. When the solution was bubbled with CO at room temperature 2 , the surfactant intermediate is reprotonated, and then adsorbed to the surface of the si...

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PUM

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Abstract

A composite emulsifier with double stimulus-response performance belongs to the field of colloid and interface chemistry. The emulsifier comprises the non-modified commercial nano-silica particles and a double stimulus-response surfactant. The nano-silica particles have primary particle diameter of 20-200nm, usage concentration of 0.1%-3.0% (with water phase as the reference). An emulsion stabilized by the emulsifier belongs to a Pickering emulsion; introduction of N2 or air into the emulsion at 50-70 DEG C leads to inactivation of the emulsifier and demulsification of the emulsion; but introduction of CO2 into the system at room temperature restores activity of the emulsifier, and the stable Pickering emulsion can be obtained after homogenization of the system; and under irradiation of UV of higher than 300nm, the emulsion droplets have larger diameter, so that the composite emulsifier has a double stimulus-response performance.

Description

technical field [0001] The invention relates to a composite emulsifier with double stimulus response performance, which belongs to the technical field of colloid and interface chemistry. Background technique [0002] Switching emulsions are widely used in daily life, industry and technology. Its formation depends on the research and development of switch emulsifiers. Usually, 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, which is generally significantly greater than its critical micelle concentration cmc. Therefore, efforts have been made to develop emulsions stabilized with surface-active particles. This type of emulsion is called Pickering emulsion, which is generally ultra-stable and can maintain long-term stability, because these surface-active particles are adsorbed at the oil / water interface to form a tight particle film, w...

Claims

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Application Information

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IPC IPC(8): B01F17/16B01F17/32C09K23/16C09K23/32
CPCC09K23/00C09K23/017
Inventor 蒋建中郑饶君马宇萱崔正刚
Owner 无锡颐景丰科技有限公司
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