Nano colloidal motor and preparation method thereof

Abstract

The invention discloses a nano colloidal motor and a preparation method thereof. The motor comprises an open spherical platinum shell, wherein the diameter of the shell is smaller than or equal to 500nm, the thickness of the shell is 5-30 nm, and the shell is coated with a silver shell or gold shell with thickness of 5-20 nm. The method comprises the following steps: firstly, placing a colloidalsphere on a substrate to form a single-layer close-packed colloidal crystal template, and heating the colloidal crystal template so as to obtain the single-layer close-packed colloidal crystal template, wherein the colloidal sphere is fixedly connected with the substrate; and then carrying out plasma etching on the single-layer close-packed colloidal crystal template so as to obtain a single-layernon-close-packed colloidal crystal template, wherein the colloidal sphere is fixedly connected with the substrate, then sequentially evaporating a platinum layer and a silver layer (or a gold layer)on the single-layer non-close-packed colloidal crystal template, then separating the colloidal sphere sequentially coated with the platinum layer and the silver layer (or the gold layer) on the surface on the single-layer non-close-packed colloidal crystal template from the substrate by using a physical method, putting the mixture into a solvent or subjecting the mixture to calcining to remove thecolloid ball to prepare a target product. The product is small in size, single in movement direction and hollow, and can be easily, widely and commercially applied to the technical fields of drug targeting motion, material transportation, ion detection, sewage treatment and the like.

Description

technical field [0001] The invention relates to a colloid motor and a preparation method thereof, in particular to a nano colloid motor and a preparation method thereof. Background technique [0002] Colloidal motors are a type of active colloidal particles that can convert the energy in the surrounding environment - chemical energy, electromagnetic energy, thermal energy, sound energy, etc. There are two types of driving energy sources: chemical driving and non-chemical driving. After nearly a decade of exploration, colloidal motors have been applied in drug-targeted movement, material transport, ion detection, and sewage treatment. Recently, people have made some useful attempts and efforts to obtain colloidal motors, such as the title "Non-Gaussian statistics for the motion of self-propelled Janus particles: experiment versus theory", Physical Review ES Statistical Nonlinear & Soft Matter Physics, 2013, 88(3 ):032304. ("Non-Gaussian Statistical Experimental and Theoreti...

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Problems solved by technology

Although this product can be used as a colloidal motor, there are deficiencies in its preparation method. First of all, due to SiO 2 The diameter of the microspheres is as high as 2 μm, resulting in a larger size of the product, which restricts the application occasions; secondly, the platinum film exposed on the outer surface makes the bubbles generated by catalytic hydrogen peroxide more dispersed, resulting in uneven force on the motor and making it move faster. complex; again, SiO 2 The existence of microspheres limits the application of motors; finally, the preparation method cannot obtain products with small size, single direction of motion and hollow structure

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