Preparation method of dumbbell-shaped Janus colloid particles

Abstract

The invention discloses a preparation method of dumbbell-shaped Janus colloid particles. The method comprises the steps of stirring and dispersing a surfactant in deionized water; adding vinyl siloxane and a reaction monomer mixture containing double bonds subjected to ultrasonic treatment for 5-30 minutes into a four-neck flask under nitrogen protection, stirring uniformly, heating until the reaction temperature is 40-75 DEG C, dropwise adding an initiator aqueous solution into a system, continuously performing reaction for 5-10 hours under the reaction temperature, then stopping stirring, cooling to the room temperature to obtain a stable white emulsion, and centrifugally washing to obtain the dumbbell-shaped Janus colloid particles. The preparation method has the characteristics that the production can be easily controlled, obtained latex can be directly used, and residual monomers can be easily removed; moreover, the reaction is performed in an aqueous medium without containing any organic solvent, so that the whole reaction process is safe and non-toxic; and the preparation method is simple in operation, and can be used for realizing the mass production of mono-dispersed Janus particles.

Description

[0001] technical field [0002] The invention belongs to the field of material chemistry, in particular to a method for preparing colloidal particles with a dumbbell-shaped Janus structure. [0003] Background technique [0004] In 1991, P. G. de Gennes used the word Janus (two-faced god) for the first time to describe the same particle with different chemical composition or properties in his Nobel Prize Lecture. The term was later used figuratively to refer to non-centrosymmetric particles with different properties, known as Janus particles. Due to its asymmetry in nature, Janus particles will inevitably cause differences in physical and chemical properties. This difference makes them useful in functional surfactants, self-assembly and molecular recognition, electronic paper, photoelectric biosensors, and multifunctional magnetic asymmetric materials. , anti-reflection film and electronic devices, photonic crystals, catalysts and other fields have shown broad application ...

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Problems solved by technology

However, there are some problems in so many preparation methods, which limit the preparation and application of Janus particles. For example, the Pickering emulsion method uses the distribution state that part of the surface of the inorganic solid particle is immersed in the oil phase and the other part of the surface is immersed in the water phase. Prepare Janus particles, but the biggest problem is that the rotation of solid particles at the interface cannot be prevented. The rotation will modify the surface of the entire particle and Janus particles cannot be obtained; the phase separation method mainly uses the different compatibility between substances, by controlling the conditions Phase separation occurs between substances to form Janus particles. This method is simple in process and large in output, but the particle size distribution obtained is relatively wide. In the case of relatively strict particle size requirements, multiple particle size classifications are required; microfluidic method The prepared Janus particles have a large particle size, and it is difficult to obtain submicron or nanometer Janus particles

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