Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing nano-fibers or nano-microspheres through ultrasonic induction and thin film formed by nano-materials

A technology of nanomaterials and nanospheres, which is applied in the preparation of nanofibers or nanospheres, and in the field of thin films formed by nanofibers or nanospheres, which can solve the problems of difficult and efficient preparation of nanofibers and nanospheres, difficult material structure regulation, Problems such as large impact of raw materials, to achieve the effect of green and renewable cost, simple method and low cost

Active Publication Date: 2022-03-18
SOUTH CHINA UNIV OF TECH
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite some progress in recent years, the synthesis of kinetically controlled supramolecular nanofibers from biomacromolecules remains a great challenge due to the complexity of natural macromolecules
Most of the current natural polymer nanofibers are prepared by top-down and electrospinning methods for natural polymers. The preparation process is complex and greatly affected by raw materials, and it is difficult to control the structure of the material.
[0003] Invention patent CN201610856609.8 prepares nanofibers of chitosan and sodium alginate by static method, but the time to form nanofibers by static method is long (6-120 hours), and the shape is difficult to control
Due to the strong electrostatic force, it is easy to form a random three-dimensional network structure, and it is difficult to efficiently prepare nanofibers and nanospheres using chitosan and sodium alginate as raw materials by standing still.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing nano-fibers or nano-microspheres through ultrasonic induction and thin film formed by nano-materials
  • Method for preparing nano-fibers or nano-microspheres through ultrasonic induction and thin film formed by nano-materials
  • Method for preparing nano-fibers or nano-microspheres through ultrasonic induction and thin film formed by nano-materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Sodium alginate (50kDa) was dissolved in water to obtain a sodium alginate solution with a mass fraction of 5%; chitosan (50kDa, deacetylation degree 90%) was dissolved in an acetic acid solution with a mass fraction of 1wt% , to obtain a mass fraction of 5% chitosan solution;

[0060] (2) Mix the sodium alginate solution and the chitosan solution in the step (1) in a mass ratio of 1:1, and process ultrasonic treatment for 2 hours (500W, 20kHz) to obtain the dispersion of chitosan / sodium alginate nanofibers liquid;

[0061] (3) The dispersion liquid of chitosan / sodium alginate nanofibers obtained in step (2) is formed into a film (suction filtration or air-drying treatment) to obtain a chitosan / sodium alginate film.

[0062] figure 1 The aqueous solution of sodium alginate (left), the acetic acid solution of chitosan (middle) and the dispersion of sodium alginate / chitosan nanofibers (right) prepared for Example 1. figure 2 For the AFM figure of (10 seconds, 0.5 ...

Embodiment 2

[0064] (1) Sodium alginate (50kDa) is dissolved in water to obtain a mass fraction of 2% sodium alginate solution; chitosan (50kDa, deacetylation degree 95%) is dissolved in 1wt% acetic acid to obtain a mass fraction 2% chitosan solution;

[0065] (2) The sodium alginate and the chitosan solution in the step (1) are mixed in a mass ratio of 1: 1, and subjected to ultrasonic treatment for 10 minutes (500W, 20kHz), to obtain a dispersed spherical microgel dispersion;

[0066] (3) The dispersion liquid of the chitosan / sodium alginate spherical microgel obtained in the step (2) is subjected to suction filtration or air-dried to obtain a chitosan / sodium alginate film.

[0067] image 3 Electron micrograph (a) and atomic force micrograph (b) of the spherical microgel obtained in Example 2, the spherical microgel obtained is different from the supramolecular fibers in Example 1, and the formation of spherical micelles is controlled by thermodynamics Spontaneous process, sonication ...

Embodiment 3

[0070] (1) Sodium alginate (75kDa) is dissolved in water to obtain a 2% sodium alginate aqueous solution; chitosan (100kDa, deacetylation degree 85%) is dissolved in 1wt% acetic acid to obtain chitosan sugar solution;

[0071] (2) the chitosan solution in the step (1) and the sodium alginate solution are mixed by the mass ratio of 2: 1 and 1: 2 respectively, and through ultrasonic field orientation 1 hour process (750W, 20kHz), the mass fraction obtained is Dispersion of chitosan / sodium alginate nanospheres;

[0072] (3) Place the dispersion of chitosan / sodium alginate nano-microspheres obtained in step (2) in a plastic box (45mm×60mm×18mm) to dry to obtain a chitosan / sodium alginate film.

[0073] Figure 4 It is the atomic force micrograph of the supramolecular ellipsoid obtained in Example 3 (the microsphere is an ellipsoid in step (2), the obtained ellipsoid microgel is different from the microsphere gel in Example 3, and its molecules are flowed Field stretching showed...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
molecular weightaaaaaaaaaa
molecular weightaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of self-assembled nano materials, and discloses a method for preparing nano fibers or nano microspheres through ultrasonic induction and a film formed by the nano materials. The method comprises the following steps: in a solvent, mixing sodium alginate and chitosan, and carrying out ultrasonic treatment to obtain a nano-material which is nano-fibers or nano-microspheres. Self-assembly is driven through interaction among the raw materials, and supermolecular nanofibers or nanospheres are prepared through an ultrasonic flow field. The nano material disclosed by the invention is stable in structure. The method is simple. The nano material disclosed by the invention forms a film with high mechanical strength, good water resistance and humidity stimulation response through film formation. The film of the invention is used in the field of humidity response, in particular in the field of intelligent sensing and actuation. The films may also be used as flexible substrates or plastic substitutes.

Description

technical field [0001] The invention belongs to the technical field of self-assembled nanometer materials, and in particular relates to a method for preparing ultrasonically induced nanofibers or nanospheres and a film formed by nanofibers or nanospheres. Background technique [0002] Supramolecules in biological systems have attracted much attention due to their unique structures and functions. Natural supramolecules always work in a non-equilibrium state. Researchers strive to seek kinetically controlled self-assembly that cannot be achieved through spontaneous thermodynamic processes. Despite some progress in recent years, the synthesis of kinetically controlled supramolecular nanofibers from biomacromolecules remains a great challenge due to the complexity of natural macromolecules. Most of the current natural polymer nanofibers are prepared by top-down and electrospinning methods of natural polymers. The preparation process is complex and greatly affected by raw mater...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/18C08J5/18C08L5/08C08L5/04B82Y40/00G01N19/10
CPCD01F8/18C08J5/18B82Y40/00G01N19/10C08J2305/08C08J2405/08C08J2305/04C08J2405/04
Inventor 钟林新彭新文卓浩
Owner SOUTH CHINA UNIV OF TECH