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Method for characterization of plant micro-nanocellulose suspensions based on atomic force microscopy

A micro-nano cellulose, atomic force microscope technology, applied in scanning probe microscopy, measuring devices, instruments, etc., to achieve the effects of good stability, real imaging, and simple preparation methods

Inactive Publication Date: 2018-04-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for characterization of plant micro-nanocellulose suspensions based on atomic force microscopy
  • Method for characterization of plant micro-nanocellulose suspensions based on atomic force microscopy

Examples

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Embodiment 1

[0029] Measure 0.11 mL of 3-aminopropyltriethoxysilane, drop it into a watch glass, then add 9.9 mL of absolute ethanol, stir to mix evenly, and adjust the pH to 5 with phosphate buffer. Soak the newly peeled 5×5mm mica sheet in the solution for 4 hours, then take it out and rinse it with absolute ethanol for 5 times, and put it in an oven to dry. Use ultrapure water to adjust the concentration of plant micronanocellulose that has been pretreated and homogenized by enzymatic method to 0.4wt%, drop a drop in the center of the modified mica sheet, and rinse off unadsorbed plants with ultrapure water after 10 minutes Micro-nano cellulose, and then drop a drop of ultra-pure water in the center of the mica sheet. Finally, the prepared sample was placed on the detection table and imaged in AFM liquid mode. Imaging of plant micro-nanocellulose in suspension figure 1 As shown, the length ranges from 1 to 3 μm, and the width ranges from 10 to 40 nm.

Embodiment 2

[0031] Measure 0.3mL of γ-aminopropyltriethoxysilane and drop it into a watch glass, then add 9.7mL of acetone, stir to mix evenly, and adjust the pH to 5.5 with phosphate buffer. Soak the newly peeled 5×5mm mica sheet in the solution for 10 h, then take it out and wash it with acetone for 5 times, and put it in an oven to dry. Use ultrapure water to adjust the concentration of the plant micronanocellulose that has been pretreated and homogenized by chemical methods to 0.8wt%, drop a drop in the center of the modified mica sheet, and rinse off unadsorbed plants with ultrapure water after 20 minutes Micro-nano cellulose, and then drop a drop of ultra-pure water in the center of the mica sheet. Finally, the prepared sample was placed on the detection table and imaged in AFM liquid mode. The plant micro-nano cellulose is imaged under the suspension, with a length ranging from 0.5 to 1 μm and a width ranging from 5 to 30 nm.

Embodiment 3

[0033] Measure 0.2 mL of diethylaminomethyltriethoxysilane, drop it into a watch glass, then add 9.8 mL of acetone, stir to mix evenly, and adjust the pH to 5.5 with phosphate buffer. Soak the newly peeled 5×5mm mica sheet in the solution for 6h, then take it out, wash it with acetone for 5 times, and put it in an oven to dry. Use ultrapure water to adjust the concentration of the plant micronanocellulose that has been pretreated and homogenized by chemical methods to 0.5%, drop a drop in the center of the modified mica sheet, and rinse off the unadsorbed plant micronose with ultrapure water after 30 minutes. nanocellulose, and then drop a drop of ultrapure water in the center of the mica sheet. Finally, the prepared sample was placed on the detection table and imaged in AFM liquid mode. Imaging of plant micro-nanocellulose in suspension figure 2 As shown, the length ranges from 0.5 to 1 μm, and the width ranges from 5 to 30 nm.

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Abstract

The invention belongs to the technical field of nano-material detection and discloses a method for the characterization of plant micro-nanocellulose suspensions based on an atomic force microscopy. The method comprises the following steps: (1), enabling a substrate to be immersed in silane modifying agent solution with the pH of 4-6, taking out the substrate, and cleaning and drying the substrate;(2), enabling the plant micro-nanocellulose suspensions to be dripped on the substrate for absorption and flushing, dripping water onto the substrate, and obtaining a to-be-tested sample; (3), placing the to-be-tested sample on a detection bench, and carrying out the detection in an imaging mode of AFM suspensions. The method is simple, saves time and labor, enables the operation to be easy to control, avoids the impact from sample keratinization through the measurement of the suspension mode, enables the imaging to be more real, and is good in repeatability and stability. The higher-qualityAFM images can be obtained at each time under the solution through the method. Meanwhile, the repeated left-right scanning of the same sample region for 20-30 times cannot cause the drift and damagesof micro-nanocellulose.

Description

technical field [0001] The invention belongs to the technical field of nanometer material detection, in particular to a method for characterizing plant micronano cellulose suspension based on an atomic force microscope. Background technique [0002] Currently, an emerging field is the development of light-weight and high-strength nanocomposites, and the application of plant micronanocellulose in nanocomposites has broad scientific and commercial value. Micro-nanocellulose is a renewable natural material with high mechanical strength, large specific surface area and high aspect ratio, good barrier and dimensional stability, good biodegradation and biocompatibility. At present, plant micro-nano cellulose has been applied to various fields such as food, cosmetics, paint, petroleum, paper, medical products, hygiene products, automobiles, aerospace and construction. [0003] The plant micro-nano cellulose has a nano-scale width and a micro-nano-scale length, and has a relatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01Q60/24
CPCG01Q60/24
Inventor 曾劲松丁其军陈克复高文花王斌
Owner SOUTH CHINA UNIV OF TECH
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