Silica Gel
Silica Gel - Related Videos
01:10
Silica Gel Column Chromatography: Overview
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2024
Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column. Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
06:30
Gel Purification
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2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
09:11
Porosimetry of a Silica Alumina Powder
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Surface area and pore size distribution are attributes used by adsorbent and catalyst manufacturers and users to ensure quality control and to determine when products are at the end of their useful lives. The surface area of a porous solid is directly related to its adsorption capacity or catalytic activity. The pore size distribution of an adsorbent or catalyst is...
06:54
Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method
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Cited by 26 •
2014
This article describes a rapid supercritical extraction method for fabricating silica aerogels. By utilizing a confined mold and hydraulic hot press, monolithic aerogels can be made in eight hours or less.
07:51
Fabrication of Silica Ultra High Quality Factor Microresonators
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Cited by 22 •
2012
We describe the use of a carbon dioxide laser reflow technique to fabricate silica resonant cavities, including free-standing microspheres and on-chip microtoroids. The reflow method removes surface imperfections, allowing long photon lifetimes within both devices. The resulting devices have ultra high quality factors, enabling applications ranging from telecommunications to biodetection.
FAQs
Water molecules adhere to the internal pore surfaces through surface interactions. Because the pores are interconnected, moisture can reach a large effective surface area rather than remaining only on the exterior. This structure allows silica gel to accumulate water by adsorption, making pore accessibility and available surface area central to its moisture-control performance.
Heating removes water retained on the pore surfaces, allowing the material to recover much of its ability to adsorb moisture. The process reverses the accumulation of water without requiring the silica gel to be replaced after every use. In environmental workflows, this regeneration can support repeated humidity-control or sample-preparation cycles.
Chemical modification changes the surface so the gel can selectively capture particular contaminants from air or water. Unmodified material is primarily used for broad moisture adsorption, whereas modified forms support more targeted separations and pollutant treatment. This distinction allows researchers to choose the material according to whether humidity control or contaminant selectivity is the main objective.
During environmental sample storage and preparation, silica gel can help control humidity around materials whose water content may affect handling or analysis. Its adsorption capacity supports drier conditions and can help concentrate substances before measurement. The specific value depends on maintaining appropriate contact between the gel and the sample environment without confusing moisture control with direct contaminant analysis.
Silica gel is useful when moisture must be controlled during preparation for water-content measurements. By adsorbing water from the surrounding environment, it helps reduce uncontrolled humidity changes that could influence a sample before analysis. This makes it relevant to workflows involving environmental materials, particularly when storage and preparation conditions need to remain consistent.
Chemically modified silica gels can selectively capture contaminants from air or water, enabling separations and pollutant-treatment workflows. They may also support analytical procedures by concentrating target substances before measurement. Their role is therefore broader than passive drying: surface modification connects adsorption with contaminant removal and with preparation of environmental samples for analysis.