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Porosity measuring method and device of porous material

A technology for porous materials and porosity, which is applied in measuring devices, suspension and porous material analysis, permeability/surface area analysis, etc. It can solve the problem that there is no method for determining the porosity of hydrophilic porous materials, and the inability to accurately measure hydrophilic porous materials Porosity and other issues, to achieve the effect of cost reduction, simple, fast and convenient measurement method, and low test cost

Inactive Publication Date: 2014-02-19
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the above description, because hydrophilic porous materials are easy to absorb water and swell, the porosity of hydrophilic porous materials cannot be accurately measured by conventional methods
There is currently no method for determining the porosity of hydrophilic porous materials

Method used

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  • Porosity measuring method and device of porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 - Bacterial cellulose film porosity measurement

[0042] Bacterial cellulose treated with deionized water: 2.5cm 2 Bacterial cellulose film pieces were soaked in 50mL deionized water for 12h.

[0043] 1% acetic acid treated bacterial cellulose: 2.5cm 2 Bacterial cellulose film blocks were soaked in 50mL of 1% acetic acid solution for 12h.

[0044] Freeze-drying the bacterial cellulose: Take out the soaked bacterial cellulose, pre-freeze it at -80°C for 4 hours, and then dry it in a freeze dryer at -76°C with a vacuum pressure of 10 Pa for 48 hours to obtain a dried bacterial cellulose film.

[0045] Porosity measurement: Firstly, 50 mL of ethanol was loaded into the graduated cylinder in the vacuum pressure vessel, and the bacterial cellulose film blocks treated with deionized water and 1% acetic acid were respectively immersed in ethanol. Start the vacuum compression cycle, wherein the vacuum pressure is 50 Pa for 10 seconds, and the pressurization press...

Embodiment 2

[0048] Example 2 - Regenerated silk protein porosity measurement

[0049] Fabrication of three-dimensional scaffolds from regenerated silk protein: first, PTFE cylinders were soaked in 5.8% (w / v) regenerated silk protein aqueous solution for 5 to 6 minutes, and 15% methanol solution was added to form a regenerated silk protein gel. The silk protein gel was pre-frozen at -80°C for 4 hours, and then dried at -76°C in a freeze dryer with a vacuum pressure of 10 Pa for 48 hours, and freeze-dried to obtain a three-dimensional scaffold of regenerated silk protein.

[0050] Porosity measurement: Firstly, 50 mL of n-hexane was filled into the graduated cylinder in the vacuum pressure vessel, and the three-dimensional scaffold of regenerated silk protein was immersed in n-hexane. Start the vacuum compression cycle, wherein the vacuum pressure is 50 Pa for 10 seconds, and the pressurization pressure is 0.10 MPa for 10 seconds, and the cycle is about 5 minutes to make n-hexane squeeze ...

Embodiment 3

[0053] Example 3 - Porosity measurement of hydroxyapatite-polylactic acid composites

[0054] Fabrication of the composite material: Take 10 mL of the polylactic acid-hydroxyapatite-dioxane mixture and add it into a 30 mL beaker, and preheat it to 50°C. Quickly transfer the beaker containing the mixed solution to the refrigerator to solidify the solvent in the mixed solution for 2 hours to induce solid-liquid phase separation. Then liquid nitrogen was used to promote deep freezing of the solidified sample, and the frozen sample was freeze-dried for 4 days under the condition of 0.5 mmHg to obtain a hydroxyapatite-polylactic acid composite material.

[0055] Porosity measurement: Firstly, 50 mL of ethanol was filled into the graduated cylinder in the vacuum pressure vessel, and the hydroxyapatite-polylactic acid composite material was immersed in the ethanol. Start the vacuum compression cycle, wherein the vacuum pressure is 50 Pa for 10 seconds, and the pressurization press...

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Abstract

The invention relates to the field of porous material characterization, and particularly discloses a porosity measuring method and a device of a porous material. The porosity measuring method comprises the steps of immersing the porous material in a nonwetting solvent in a vacuum pressure vessel, recording the volume V1 of the nonwetting solvent before immersion, performing vacuum compression cycle to allow the nonwetting solvent to be squeezed into pores of the porous material and fully fill in the open pores of the porous material, recording the total volume V2 of the nonwetting solvent and the immersed porous material, removing the porous material immersed with the nonwetting solvent, recording the volume V3 of the residual nonwetting solvent, and calculating the porosity of the porous material according to a formula: the porosity (%) =[(V1-V3) / (V2-V3)]*100. According to the method and the device, a liquid displacement method is employed to measure the porosity of the porous material, the measuring method is simple, quick and convenient, the test cost and pollution are low, and the safety performance is high.

Description

technical field [0001] The invention relates to the field of porous material characterization, in particular to a method and device for measuring the porosity of porous materials. Background technique [0002] Porosity is the ratio of the total volume of the interconnected tiny voids in the porous medium to the external volume of the porous medium (the porosity mentioned in this application refers to the effective porosity). Porosity is an important physical characteristic of the material itself. It is used to characterize the porosity and density of the material. It directly affects the physical and mechanical properties of the material, such as strength and toughness, air permeability and water absorption. [0003] Traditional and novel methods for determining the porosity of materials include density measurement and drainage method, mercury porosimetry method, scanning electron microscope SEM imaging analysis, micro-computed tomography technology Micro-CT, etc. [0004] ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 周新胡阳潘浩波王金慧朱勇军
Owner SHENZHEN INST OF ADVANCED TECH
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