Composite colloidal material based on inorganic nanowires and its preparation method and 3D printing application

Abstract

The invention relates to an inorganic nanowire-based composite gel material, a preparation method thereof, and application thereof to 3D printing. The inorganic nanowire-based composite gel material is composed of 1) one-dimensional nanowires or nanotubes, 2) two-dimensional nanosheets, 3) surfactant and 4) solvents, wherein, calculated according to the formula of phi=(pi / 4)ar-1, the volume concentration of the nanowires is greater than or equal to phi, and ar is the length-diameter ratio of the nanowires or nanotubes; the content of the two-dimensional nanosheets is one fifth or one fifteenthof the mass fraction of the nanowires; the weight percentage of the surfactant in the inorganic nanowire-based composite gel material is 0-2%; the solvents are composed of water, N, N-dimethyl formamide and the like. The inorganic nanowires form a stable three-dimensional cross-linked network in high-concentrate aqueous dispersion liquid to prepare the one-dimensional nanowire / nanotube and two-dimensional nanosheet composite gel material with excellent rheological properties. The inorganic nanowire-based composite gel material is high in viscosity and rheological property and can be applied to 3D printing, thereby having a broad application prospect in the fields such as anti-static, energy source, electronic elements, sensors and electromagnetic shielding.

Description

technical field [0001] The invention relates to a composite colloidal material based on inorganic nanowires, its preparation method and 3D printing application. The inorganic nano-sheet material acts as a cross-linking agent and a dispersant for the nano-wires at the same time, so that the inorganic nano-wires form a stable three-dimensional cross-linked network in a high-concentration solvent dispersion, thereby preparing a nano-wire composite colloid. Preparation of microelectronic device electrodes by 3D printing technology and further construction of microelectronic and energy storage devices such as field effect transistors, supercapacitors, photoelectric sensors, etc., have broad applications in antistatic, energy, electronic components, sensors, electromagnetic shielding and other fields prospect. Background technique [0002] 3D printing technology is one of the methods of additive manufacturing. It does not require processing or molds. The parts can be printed dire...

AI Technical Summary

Problems solved by technology

However, due to the introduction of a large number of non-functional materials, functional inks will have two insurmountable problems: (1) The existence of non-functional materials will greatly affect the functionality of 3D printing materials and reduce the performance of target devices ; If non-functional materials are removed after printing by post-processing technology, it is easy to destroy the mechanical properties of the printed structure and reduce the mechanical stability of the target device

(2) Micro-nano functional materials are prone to agglomeration or coagulation in non-functional host materials, which greatly reduces the printability and functionality of functional inks, and also limits the types of available micro-nano functional materials

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