Membrane mechanical strength characterization method and device based on membrane pressure test

A technology of mechanical strength and thin film, which is applied in the field of mechanical strength detection of thin film, can solve the problems that the mechanical strength of thin film cannot be tested effectively, and achieve the effect of reliable and stable test method

Active Publication Date: 2022-05-03
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art that the mechanical strength of films with low mechanical strength cannot be directly and effectively tested, and to provide a method and device for characterization of the mechanical strength of thin films based on the pressure test through the membrane

Method used

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  • Membrane mechanical strength characterization method and device based on membrane pressure test
  • Membrane mechanical strength characterization method and device based on membrane pressure test
  • Membrane mechanical strength characterization method and device based on membrane pressure test

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Embodiment 1

[0034] This embodiment provides a method for detecting the mechanical strength of a thin film placed on a porous membrane through a membrane pressure testing device. The film has the characteristics of low mechanical strength and it is difficult to effectively test and characterize its mechanical strength. refer to figure 1 , with porous material (for example porous film) as carrier 1, described carrier 1 has relative upper surface and lower surface; placed in a closed channel. Specifically, the carrier 1 carrying the film to be tested 2 can be placed between the upper fixture 3 and the lower fixture 4 to seal, the upper cavity 5 communicates with the film to be tested 2 through the upper fixture 3, and the lower channel 6 communicates with the carrier 1 through the lower fixture 4 The upper cavity 5 and the lower channel 6 are connected by the upper clamp 3 and the lower clamp 4 to form the aforementioned airtight channel whose conduction is determined by the carrier 1 and ...

Embodiment 2

[0036] refer to figure 2, a thin film mechanical strength characterization device based on the membrane pressure test, comprising a first phase cavity 5, a second phase channel 6, a carrier porous membrane 1 and a syringe pump or a peristaltic pump 8; the first phase cavity 5 and the second phase The phase channel 6 is sealed and connected up and down to form a closed channel, and the porous membrane 1 is arranged at the junction of the first phase cavity 5 and the second phase channel 6 and separates the closed channel. Specifically, the porous membrane 1 can be sealed between the upper clamp 3 and the lower clamp 4, the first phase cavity 5 communicates with the upper surface of the porous membrane 1 through the upper clamp 3, and the second phase channel 6 communicates with the porous membrane 1 through the lower clamp 4. The lower surface of the membrane 1 communicates, and the pressure sensor is connected to the second phase channel 6 . The first phase cavity 5 is used ...

Embodiment 3

[0045] This embodiment utilizes the host-guest interaction between cyclodextrin and alkane, in figure 2 Films were grown in the setup shown and their mechanical strength was examined. The aqueous solution system in this embodiment can be α-cyclodextrin, β-cyclodextrin or γ-cyclodextrin, and the oil phase system can be dodecane, tetradecane or hexadecane, etc. The concentration of cyclodextrin can be 0.001 mol / L to 0.005 mol / L. The alkane is poured into the cavity 5 of the first phase, and the alkane contacts and diffuses with the upper surface of the porous membrane 1 . The aqueous solution of cyclodextrin is injected into the entire second phase channel 6 . In the second phase channel 6 , the cyclodextrin aqueous solution in the second phase channel 6 has a certain flow through the peristaltic pump, and the dextrin aqueous solution contacts and diffuses with the lower surface of the porous membrane 1 . The porous membrane 1 of this embodiment is made of hydrophilic, such ...

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Abstract

The invention discloses a method for characterizing the mechanical strength of a thin film based on a pressure test through a membrane. The porous material is used as a carrier, the thin film to be tested is carried on the first surface of the carrier, and the carrier carrying the thin film to be tested is placed in a closed channel. , the fluid is passed into the side of the closed channel close to the second surface, and the transmembrane pressure when the fluid passes through the carrier and destroys the membrane to be tested is detected. The invention also provides an in-situ film mechanical strength characterization method and device. The invention aims at the problem that it is difficult to detect films with low mechanical strength by conventional methods, and can realize the detection of films with low mechanical strength by means of confined space pressure test, the test method is reliable, the stability is strong, and the obtained values ​​are comparable .

Description

technical field [0001] The invention specifically relates to the mechanical strength detection of thin films, and belongs to the technical field of new system device design and film detection. Background technique [0002] The common methods to characterize the mechanical strength of the film are: scanning electron microscope, which directly observes the thickness of the film; the load-bearing method, which tests the load-bearing capacity of the film by placing a weight on top of the film; modulus etc. However, for films with low mechanical strength, it is very likely that the film will be destroyed during the test operation using the above method, and it is difficult to detect and compare the mechanical strength of the film. [0003] In particular, for some skin-like films that have received widespread attention in recent years, these films are mostly biological films, usually less than 10 μm in thickness, and the main components are proteins, phospholipids, polymers, surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12G01N3/02
CPCG01N3/12G01N3/02G01N2203/0019G01N2203/0048G01N2203/0298
Inventor 侯旭雷津美樊漪
Owner XIAMEN UNIV
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