Characterization of Pore Structure in Textiles (Part-2)

Characterization of Pore Structure in Textiles (Part-2)

Arpita Kothari
M. Tech. Scholar
Department of Textile Technology,
NIT Jalandhar, India
Cell: +91- 7837-696041
Email: geniousarpita@gmail.com

-----Previous Part                                                       Next Part----


3. Pore characteristics and their application in various industries:
Different pore characteristics have their own utility in different applications which are listed below in table no. 2: [7]

Table 2: Importance of pore characteristics in various fields


Application
Required pore characteristics
Arterial support
Pore diameter
Pore distribution
Pore volume
Burst pressure
Apparel
Pore size
Break through volume
Vapour permeability
Tissue growth and culture
Pore diameter
Pore distribution
Liquid permeability
Household and clothing
Pore size
Pore volume
Pore distribution
Break through pore
Vapour transmission
Gas transmission
Filtration
Pore size
Pore distribution
Liquid permeability
Gas permeability
Pore surface area
Temperature effect
Environment effect

4. Characterization techniques:
The techniques used for characterizing the pore structure are described below in table no. 3: [5]

Table 3: Techniques used for measurement of characterization of pore

Measurement techniques Instrument
Porometry
Capillary flow porometer
Compression porometer
Integrity analyser
Bubble point tester
Filtration media analyser
Complete filter cartridge analyser
Capillary condensation flow porometer
Liquid-liquid porometer
Porosimetry(intrusion)
Mercury/nonmercury porosimeter
Porosimetry(extrusion)
Liquid extrusion porosimeter
Gas adsorption
BET sorptometer
BET liqisorb sorptometer
Pycnometry
Gas pycnometer
Mercury pycnometer
 

4.1.Brief study of different techniques:
Different techniques used in textiles for characterization of pore are listed below in table no.4. [5]

Table 4: different techniques with their capabilities:

Technique
Principle
Capabilities
Capillary flow porometer
Displacement of wetting liquid from pore by gas under pressure.
Mean pore size, pore size distribution, largest pore, integrity, gas permeability, envelope surface area
Compression flow porometer
Compressive stress is applied. The flow rate and pressure is measured using dry and wet samples. These data are used to calculate the effect of compressive stress on pore size and its distribution.
Pore throat diameter, Pore size distribution, Gas permeability
Integrity analyser
Gas is allowed to flow with increasing pressure and then detect the gas flow through the sample before any pore is being emptied of liquid , thus integrity is determined.
Pore size, Largest pore, Liquid permeability
Bubble point tester
Gas pressure is applied to wetting liquid.The pressure at which gas starts flow is know as bubble point.
Largest pore size
Liquid extrusion porosimeter
Measures volume of wetting liquid displaced from pores under gas pressure.
Mean pore size, Total pore volume, Liquid permeability, Pore size distribution
Gas permeameter
It is used to determine the permeability of porous solids. A gas such as air is forced to flow through the test sample.
Gas permeability
Liquid permeameter
The flow of liquid through sample is measured by the distance a column of liquid drops in relation to time and pressure.
Liquid permeability
 

4.2. Capabilities and limitations of techniques:
There are two techniques which are most widely accepted for measurement of pores; one is Porosimetry which can measure only porosity(pore volume and pore size distribution), another is porometry which can measure largest pore, smallest pore as well as pore size distribution. [6]

Characterization technique in table 5and 6 showing different capabilities and limitations of different pore with their pore diameter range.

Table 5: Capabilities of different technique [7]

Capability
Measurement technique
Extrusion flow porometry
Capillary condensation flow porometry
Extrusion porosimetry
Mercury intrusion porosimetry
Vacuapore
Gas adsorption
Through pore
All diameter
Pore distribution
Surface area
Gas/liquid permeability
Largest diameter
Mean flow diameter
Gas permeability
Volume
Volume distribution
Surface area
Gas permeability
Through and blind pore
All diameter
Volume
Volume distribution
Surface area
All diameter
Volume
Volume distribution
Surface area
All diameter
Volume
Volume distribution
Surface area
 

Table 6: Limitations and pore diameter range of techniques [7]
Measurement technique

Extrusion flow porometry
Capillary condensation flow porometry
Extrusion porosimetry
Mercury intrusion porosimetry
Vacuapore
Gas adsorption
Limitations
Use of toxic material, fixed fluid, high pressure, time consuming
Use of toxic material, fixed fluid, high pressure, time consuming
Use of toxic material, fixed fluid, high pressure,
Use of toxic material, fixed fluid, high pressure, time consuming
Use of toxic material, fixed fluid, high pressure,
Pore diameter range(micron)
.013-500
.0005-.02
.05-2000
.003-500
.0003-.2





1   2   3   4  

0 comments:

Comment here

Textile Learner is the largest Textile Blog over the net. It is an ultimate reference for textile students. It describes textile articles in comprehensive. It also supplies news on latest textile technology, educational institute news of the world.