Device and method for preparing PVDF (polyvinylidene fluoride) micro-particle probe by physical adhesion method

A technology of microparticle and adhesion method, applied in the field of atomic force microscope (AFM) probe preparation, can solve the problems of affecting microscopic force measurement, complex preparation method, narrow source range, etc. Simple and fast effects

Active Publication Date: 2013-04-03
陕西省膜分离技术研究院有限公司
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  • Description
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  • Application Information

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Problems solved by technology

However, -COOH, -OH and BSA microparticles are not only expensive, single in type, narrow in source range, and complicated in preparation methods, but also easily denatured, low in yield, and have very strict requirements on storage conditions, preparation conditions, and testing environments; in addition, The above-mentioned probes only represent a single pollutant among the pollutants in the separation membrane, and they are easy to interact with other pollutants in the water under complex water quality conditions, affecting the determination of microscopic force

Method used

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  • Device and method for preparing PVDF (polyvinylidene fluoride) micro-particle probe by physical adhesion method
  • Device and method for preparing PVDF (polyvinylidene fluoride) micro-particle probe by physical adhesion method
  • Device and method for preparing PVDF (polyvinylidene fluoride) micro-particle probe by physical adhesion method

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Experimental program
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Embodiment 1

[0037] 1) Place the commercially purchased PVDF microparticles in an aqueous solution with a N,N-dimethylacetamide content of 20wt%, stir and dissolve at 60°C for 1.5h, stop heating the aqueous solution, continue stirring and pour into the aqueous solution continuously Add ice cubes until the temperature of the mixture reaches 0°C;

[0038] The main mechanism of this method is that the organic solvent is a PVDF solvent, and water is a PVDF non-solvent. During the process of stirring and dissolving PVDF at high temperature, the organic solvent is continuously volatilized while the PVDF particles are continuously dissolving, and the particle size is also continuously decreasing. When the organic solvent is completely volatilized, the temperature is rapidly lowered and cooled, so that the PVDF microparticles are quickly gelled and solidified in the aqueous solution, and PVDF microparticles with small particle sizes are obtained.

[0039] 2) Ultrasonic disperse the aqueous solutio...

Embodiment 2、 Embodiment 3、 Embodiment 4

[0048] Embodiment 2,3,4 preparation steps and equipment technological process are the same as embodiment 1, and concrete preparation conditions are as follows:

[0049]

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Abstract

The invention discloses a device and a method for preparing a PVDF (polyvinylidene fluoride) micro-particle probe by a physical adhesion method. The device comprises a micro-operator and a microscope which are arranged on a foundation table, wherein an L-shaped probe clamp is arranged at the end of the micro-operator, and the lens of the microscope and the L-shaped probe clamp are oppositely arranged. The method comprises the following steps of: preparing PVDF microparticles having the particle size of 5-20 mum; and adhering the obtained PVDF microparticles at the free end of the micro-suspension arm of an AFM (atomic force microscope) tipless probe by virtue of an adhesive, drying and curing, and then obtaining the PVDF micro-particle probe. The device and the method disclosed by the invention are suitable for preparation for various micro-particle probes, simple and practicable, and strong in practicability; and the obtained PVDF microparticle probe is low in cost, wide in source, and capable of being used for the quantitative measurement for a micro-force between membrane-pollutants and pollutants under different water quality conditions, so as to analyse a membrane pollution mechanism.

Description

technical field [0001] The invention belongs to the field of atomic force microscope (AFM) probe preparation, and in particular relates to a device and method for preparing PVDF microparticle probes by a physical adhesion method. Background technique [0002] Atomic force microscopy (AFM) has been developed for decades since its inception in 1986. With its atomic-level resolution, no sample pretreatment is required, and it can effectively measure AFM probes and The characteristics of the interaction force between samples have been widely used in the measurement and analysis of microscopic forces in the fields of biology, chemistry, colloid, and environment. However, the ordinary AFM probe is made of silicide, so the microscopic force measured by the ordinary AFM probe is the force between the silicide and the sample, which cannot meet the application requirements of the majority of researchers. Therefore, the probe Modification technology came into being. Among them, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01Q60/38
Inventor 苗瑞王磊吕永涛王旭东黄丹曦孟小荣鞠恺冯玲刘紫文
Owner 陕西省膜分离技术研究院有限公司
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