Determination of transport characteristics of granulated sorbents in adsorber

Kazanin, I. V.; Zinovyev, V. N.; Lebiga, V. A.; Pak, A. Yu.; Фомин, В. М.; Vereshchagin, A. S.; Tsibulsky, N. G.

doi:10.1063/1.5027341

Cited by 5 publications

(1 citation statement)

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“…Apart from the aforementioned imaging and spectroscopic techniques, other methods include nitrogen adsorption and BET analysis, mercury intrusion porosimetry, dynamic vapor sorption, pycnometry and envelope density analysis. The later (non-imaging) techniques require the flow of a fluid through the materials to evaluate their porosity [24,31,[35][36][37][38][39][40]. However, in some cases, such flows are usually done under the influence of applied pressure that may affect the fine grains of some coatings, leading to inconsistent or false results [41].…”

Section: Introductionmentioning

confidence: 99%

Capillary Rise: A Simple Tool for Simultaneous Determination of Porosity and Thickness of Thin Silica Coatings

Ubuo,

Udoetok,

Tyouwa

et al. 2023

J. Compos. Sci.

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Coating porosity is an important property that supports solid-gas and solid-liquid exchange that can either enhance various science and technological applications or promote damage if not properly controlled. However, non-destructive instrumental techniques for the measurement of porosity on coated walls or surfaces can be quite challenging. Here, a seamless capillary rise technique has been used to determine both the thickness and porosity of a thin silica coating. Uniform coatings were prepared from 5 wt% hydrophobic fumed silica in absolute ethanol and spin-coated at 500–8000 rpm on glass slides. Capillary imbibition of squalane was then controlled into known areas of the resulted hydrophobic nano-porous coatings. The mass of the solid (silica) and the infiltrated oil (squalane) were gravimetrically measured. The porosity of the material was calculated as the percentage fraction of the pore volume while the film thickness was determined as the ratio of the total volume to the area of coverage. Mean values of the porosity and coating thickness calculated from capillary impregnation technique were 86 ± 2% and 3.7 ± 0.2 μm, respectively. The coating thickness obtained was comparable with those revealed by SEM and Dektak profiler measurements. This study highlights the effectiveness of capillary rise as a simple and cost-effective non-destructive technique for assessment of coating thickness and porosity.

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