A light transmission technique for pore size measurement in track-etched membranes

Field observations of downslope bentonite erosion from a geosynthetic clay liner (GCL) covered by only a black geomembrane are reported for a composite liner left exposed without a protective soil cover for much longer than recommended by the GCL manufacturer. A new nondestructive, light-transmission technique developed to investigate bentonite erosion features in the field is presented. A classification system is developed to describe the type of erosion features observed. Results from five field investigations at the Queen’s University Environmental Liner Test Site (QUELTS II) are reported to quantify the onset, progression, and severity of downslope erosion for one particular geotextile-encased, needle-punched GCL for exposure periods of between 7 weeks and 1.3 years. The first significant erosion feature (type “E”with bentonite loss narrower than 2.5 cm) was observed after 6 months of exposure. Irrecoverable erosion features (type “EE” with bentonite loss wider than 2.5 cm) were observed after 12 months of exposure. These findings highlight the need to follow the manufacturer’s recommendations for timely covering of a composite liner with soil following liner installation.

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SELECTIVE LIGHT TRANSMISSION THROUGH 3D SKELETAL POLYMERIC COMPLEXES WITH CONTROLLABLE PORE SIZE

Acta Polymerica Sinica ◽

10.3724/sp.j.1105.2010.00033 ◽

2010 ◽

Vol 010 (1) ◽

pp. 33-38

Author(s):

Ruifeng ZHANG ◽

Nengbing LONG

Keyword(s):

Pore Size ◽

Light Transmission ◽

Polymeric Complexes

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Analysis and monitoring: how to improve precision pore size measurement

Filtration + Separation ◽

10.1016/s0015-1882(06)70812-6 ◽

2006 ◽

Vol 43 (3) ◽

pp. 28-29 ◽

Cited By ~ 2

Author(s):

Graham Rideal

Keyword(s):

Pore Size ◽

Size Measurement

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Effect of Different Types of Pore-Forming Agent on the Macro Pore Size of Ceramic

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.761.380 ◽

2015 ◽

Vol 761 ◽

pp. 380-384 ◽

Cited By ~ 1

Author(s):

Nurulfazielah Nasir ◽

Ridhwan Jumaidin ◽

Mohd Zulkefli Selamat ◽

Suhaila Salleh ◽

Kok Tee Lau

Keyword(s):

Ethylene Glycol ◽

Pore Size ◽

Calcium Oxide ◽

Sintering Temperature ◽

Porous Ceramic ◽

Microstructural Analysis ◽

Insulation Material ◽

Size Measurement ◽

Aluminium Powder ◽

Different Types

The aim of this study is to determine the effect of different types of pore-forming agent and sintering temperature on the pore size of ceramics. The porous ceramic material was developed by mixing of alumina, zeolite and calcium oxide (CaO) as the main materials and ethylene glycol as the binder. Meanwhile, two types of pore-forming agent were used, i.e., yeast and a mixture of aluminium powder and expandable polymeric spheres (EPS). The content of pore-forming agent was at 10 wt% of the mixture and the samples were shaped by using plaster of paris mould. After being dried, the samples were sintered at temperature range of 1000 up to 1500 °C for two hours. Microstructural analysis and pores size measurement were performed to determine the effect of pore-forming agent and sintering temperature on the ceramic. The result showed that yeast yielded larger pore sizes in the porous ceramic upon being sintered at 1400 °C for two hours, which were up to 402 μm. Therefore, yeast has the potential to be utilized as pore-forming agent in development of filter and wall insulation material.

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Solute transport by suspended buoyant particles

EPJ Web of Conferences ◽

10.1051/epjconf/202124909002 ◽

2021 ◽

Vol 249 ◽

pp. 09002

Author(s):

Iván Colecchio ◽

Natalia Arze ◽

Georgina Flores ◽

Ana Quijandria ◽

Alejandro Boschan

Keyword(s):

Solute Transport ◽

Solid Fraction ◽

Light Transmission ◽

Solute Concentration ◽

Suspended Particles ◽

Sharp Interface ◽

Transmission Technique ◽

Fingering Instability ◽

Mass Discharge ◽

Hele Shaw Cell

The transport of a colouring solute, driven by the buoyant displacement of microscopic suspended particles, and in the absence of net flow, is studied experimentally in a Hele Shaw cell. Initially, a sharp interface between a transparent fluid without particles and an underlying coloured suspension is obtained. From this situation, the suspended particles rise, carrying the solute in the form of a fingering instability across the interface, where a light transmission technique is used to measure the local solute concentration. This one attains an asymptotic value that increases with the solid fraction ϕ of suspended particles, and decreases with the distance to the interface. The solute mass discharge also increases with ϕ, always being relatively small (< 3%). The onset and development of the instability as the mechanism driving the transport of the solute is discussed.

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