Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for measuring carboxyl content of nanocellulose by using multi-wavelength spectrum technology

A technology of nanocellulose and spectroscopic technology, which is applied in the field of multi-wavelength spectroscopic technology to determine the carboxyl content of nanocellulose, and can solve the problems of impossible component content and other problems

Active Publication Date: 2020-10-20
SOUTH CHINA UNIV OF TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unlike the above samples, nanocellulose is completely water-soluble, and its complex of carboxylic acid groups and methylene blue (R-COOMB) is also water-soluble, while the spectrum of methylene blue itself and the carboxylic acid groups on nanocellulose The spectrum of the methylene blue complex is largely overlapping, so it is not possible to quantify the absorbing individual components to determine the amount of the components in the actual mixture

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 measuring carboxyl content of nanocellulose by using multi-wavelength spectrum technology
  • Method for measuring carboxyl content of nanocellulose by using multi-wavelength spectrum technology
  • Method for measuring carboxyl content of nanocellulose by using multi-wavelength spectrum technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment measures the carboxyl content of nanocellulose prepared under different oxidation processes, and the specific determination steps are as follows:

[0042](1) Using deionized water as a blank, scan the full spectrum with an ultraviolet-visible spectrophotometer (UV-Vis), and correct the absorbance at 0 point.

[0043] (2) After mixing 5 mL of MB aqueous solution with a concentration of 31.3 μmol / L and 5 mL of deionized water, the pure spectrum of methylene blue was obtained by UV-Vis scanning①.

[0044] (3) After mixing the nanocellulose aqueous solution with a concentration of 3 mg / L and an equal volume of deionized water, scan its full spectrum with UV-Vis to obtain the spectrogram of the nanocellulose aqueous solution ②;

[0045] (4) After mixing the MB aqueous solution with a volume of 5mL and a concentration of 31.3μmol / L and the aqueous solution of nanocellulose with a volume of 5mL and a concentration of 168mg / L, after UV-Vis scanning, the carboxyl...

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

No PUM Login to View More

Abstract

The invention discloses a method for determining the carboxyl content of nanocellulose by a multi-wavelength spectrum technology. Methylene blue is adopted as a color developing agent to form an R-COOMB associate with carboxyl of nano-cellulose through an ion exchange reaction, and the problem that the spectrum of methylene blue and the spectrum of the generated associate RCOOMB are completely overlapped within the wavelength range of 500-750 nm is solved in combination with a multivariable numerical analysis technology. Results show that compared with a reference method, the method provided by the invention has better measurement precision and accuracy. Therefore, the method disclosed by the invention is simple, convenient and rapid, and is suitable for measuring the carboxyl content in the nanocellulose.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a method for measuring the carboxyl content of nanocellulose by multi-wavelength spectroscopy. Background technique [0002] Nanocellulose (nanocelluloses) refers to cellulose functional materials with a size of 1-100 nm in at least one dimension. In addition to having a wide range of natural cellulose sources, degradable regeneration and environmental friendliness, nanocellulose also has unique advantages such as high specific surface area, high strength, high Young's modulus and high transparency. Therefore, it is widely used in cosmetics, coatings, biological It has broad application prospects in medicine, energy electronics and other industries. In the preparation process of nanocellulose, chemical methods are used, such as: TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-NaBr-NaClO oxidation, persulfate oxidative degradation, high The iodate...

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): G01N21/31G01N21/33
CPCG01N21/31G01N21/33G01N2021/3129
Inventor 闫宁柴欣生
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com