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Rapid detection method for fibrillation degree of nanocellulose

A technology of nanocellulose and a detection method, which is applied in the field of rapid detection of the degree of fibrillation of nanocellulose, can solve the problems of easy damage, expensive instruments, cumbersome detection steps, etc., and achieves strong operability, convenient use, and reduced energy consumption. Effect

Active Publication Date: 2020-05-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods generally have some limitations in measurement, including: cumbersome detection steps, long detection time, expensive and easily damaged instruments, limited samples for single measurement, etc., so they are only suitable for relevant experiments in laboratories. Research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Measure the concentration of the nanocellulose standard sample (11-18nm in diameter, 445-887 in aspect ratio), and the concentration is 0.5%; take 8g of the standard sample in 2 test tubes (the test tubes are the same), add pure water to each The volume of liquid in the centrifuge tube is 40mL, the standard sample is diluted to a concentration of 0.1%, and then the centrifuge tube is symmetrically placed in a small electric centrifuge. In addition, the coniferous wood pulp is pretreated with 5% citric acid buffer solution (buffer solution concentration is 5% of dry fiber), and then processed through ultrafine particle pulverizer (masukosangyo company provides) (grinding 20 times with -10 disc gap), And through a high-pressure micro-fluidic machine (Siemens) with a model Z8 spray nozzle, 20000Pa pressure homogenization treatment 10 times, to obtain nanocellulose suspension, its concentration was determined to be 0.76wt%. Take 1.75g ​​of test samples respectively in 2 cen...

Embodiment 2

[0032] The nanocellulose standard sample (with a diameter of 11-18nm and an aspect ratio of 445-887) was used for concentration measurement, and the concentration was 0.5%. Take 8g of the standard sample in two test tubes, add pure water to make the liquid volume in each centrifuge tube 40mL, dilute the standard sample to a concentration of 0.1%, and then put the centrifuge tubes symmetrically into a small electric centrifuge. In addition, the coniferous wood pulp was pretreated with 5% citric acid buffer solution (the buffer solution concentration was 5% of the dry fiber), and then processed through an ultrafine pulverizer (provided by masuko sangyo company) (grinding 20 times with a -10 disc gap) , and through a high-pressure micro-fluidic machine (provided by Siemens) with a model Z8 nozzle, 20000Pa pressure homogeneous treatment 5 times to obtain a nanocellulose suspension, and measure its concentration, which is 0.48%. Take 8.33g of test samples in 2 centrifuge tubes, add...

Embodiment 3

[0034]Compared with the natural sedimentation method: measure the concentration of the nanocellulose standard sample (11-18nm in diameter, 445-887 in aspect ratio), the concentration is 0.5%, take 20g of the standard sample in a 100mL graduated cylinder, add pure water to the volume of the graduated cylinder For the maximum range, the standard sample was diluted to a concentration of 0.1%. At the same time, the coniferous wood pulp was pretreated with 5% citric acid buffer solution (buffer concentration was 5% dry fiber), and then passed through an ultrafine pulverizer (masuko sangyo Provided by the company) treatment (grinding 20 times with -10 disc gaps), and through a high-pressure micro-jet machine (Siemens provided) with a model of D8 nozzle, 10000Pa pressure homogeneous treatment 8 times, to obtain nanocellulose suspension, measure Its concentration is 0.8%. Take 12.5g of the test sample in a 100mL graduated cylinder, add pure water to the maximum capacity of the graduat...

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Abstract

The invention belongs to the technical field of nanocellulose, and discloses a rapid detection method for the fibrillation degree of nanocellulose. The rapid detection method comprises the following steps: 1) preparing a suspension from known nano cellulose by using water as a standard sample; then, preparing to-be-detected nanocellulose into a to-be-detected suspension by adopting water, using the to-be-detected suspension as a to-be-detected sample, and the concentration of the to-be-detected sample being the same as that of the standard sample; 2) respectively filling a sample to be detected and a standard sample into two semitransparent or transparent containers with the same volume, placing the container in a centrifugal device for centrifugal sedimentation, after centrifugation, collecting the standard sample and the supernatant of the to-be-detected sample in a transparent container, comparing the time required for secondary sedimentation of the to-be-detected sample and the standard sample, and under the condition of the same sedimentation distance, the shorter the sedimentation time is, the smaller the fibrillation degree of the to-be-detected nanocellulose is. The methodis simple, rapid and low in cost.

Description

technical field [0001] The invention belongs to the technical field of nanocellulose, and in particular relates to a rapid detection method for the degree of fibrillation of nanocellulose. Background technique [0002] Nanocellulose refers to cellulose whose diameter is at the nanometer level, generally tens of nanometers, usually including nanofibril cellulose and cellulose nanocrystals, which have a large aspect ratio, high specific surface area, small mass, mechanical strength and Excellent optical properties and other advantages are widely used in the fields of paper performance enhancement and preparation of emerging materials such as aerogels. It is the focus and hotspot of current research researchers. At present, many studies focus on mechanical or chemical methods for the preparation of nanocellulose. The nanocellulose with excellent preparation effect has uniform size distribution and good homogeneity, and the formed suspension is stable and does not easily floccul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00G01N23/00G01Q60/24
CPCG01N19/00G01N23/00G01Q60/24
Inventor 曾劲松曾展霆
Owner SOUTH CHINA UNIV OF TECH
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