Method for preparing nanofluid diode responsive to pH and temperature based on gelatin-modified solid nanopores

Abstract

The invention relates to a method for preparing a nanofluid diode responsive to pH and temperature based on gelatin-modified solid nanopores. The inner surfaces of the nanopores are modified by adopting an electrostatic adsorption method. Firstly, chemical etching is carried out on a PET film to obtain a single conical nanopore, at the moment, the inner surface of the nanopore has a plurality of carboxyl groups, and gelatin molecules have a large amount of amino groups, so that gelatin can be modified to the inner surface of the nanopore through an electrostatic adsorption method to obtain thegelatin-modified nanopore. Under the action of pH, the gelatin molecule modified nanopore is used for obtaining a nanofluid diode with cation selectivity, and the on / off state of the nanopore is adjusted through temperature. A covalent modification method is prevented from being used for modification, so that the problem that a nanofluid diode with pH and temperature response on a solid nanoporecannot be obtained due to insufficient modification density of gelatin molecules on the solid nanopore is avoided.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanofluid devices, and relates to a method for preparing a nanofluid diode responsive to pH and temperature based on a gelatin-modified solid nanopore. The method is realized by modifying gelatin molecules on the inner surface of the nanopore. Background technique [0002] Gelatin is partially degraded by collagen in connective tissues such as animal skin, bone, and sarcolemma to become white or light yellow, translucent, and slightly shiny flakes or powders. It has no fixed structure and relative molecular weight, and has good biological phase. Capacitance. Gelatin is one of the very important natural biopolymer materials and has been widely used in food, medicine and chemical industries. There are a large number of amino groups and carboxyl groups on the surface of gelatin molecules, which provides the possibility for the modification of the inner surface of nanopores. And gelatin has t...

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Problems solved by technology

At present, there are still many difficulties in the preparation of artificial nanofluidic diodes by modifying functional molecules on the inner surface of nanopores, as follows: (i) the size of the nanopores is small, and the modified substances are difficult to enter, so that the modified substances on the nanopores The density is not enough or the nanopore is blocked; (ii) the covalent modification operation is complicated, and the cost of synthesizing molecules with a specific structure is high; (iii) the surface of the nanopore is unstable after modification, and the modification is easy to fall off, which makes the repeatability of the nanofluidic diode poor

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