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Updated: Feb 7, 2026

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Published on: October 18, 2017

Adsorption at Confined Interfaces.

Prudhvidhar Gaddam¹, Robert Grayson¹, William Ducker¹

¹Department of Chemical Engineering and Center for Soft Matter and Biological Physics , Virginia Tech , Blacksburg , Virginia 24061 , United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 7, 2018

Summary

This summary is machine-generated.

Adsorption in thin films changes with confinement. Dye depletion decreases as plate separation lessens, consistent with Poisson-Boltzmann calculations.

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Fabrication of Spatially Confined Complex Oxides

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Published on: July 1, 2013

Area of Science:

Physical Chemistry
Surface Science
Colloid Science

Background:

Adsorption phenomena are crucial in thin films, influencing properties like stability.
Confinement effects, such as charge regulation, alter ion adsorption with film thickness.
Direct measurement of adsorption under confinement is challenging.

Purpose of the Study:

To directly measure adsorption between flat plates as a function of confinement in nanometer-scale separations.
To investigate the impact of film thickness on the depletion of a fluorescent dye.
To validate experimental findings with theoretical models like the Poisson-Boltzmann equation.

Main Methods:

Utilized visible-light interference in a wedge-shaped gap between silicon and glass wafers to measure separations from 0-65 nm.
Quantified adsorbed amounts by measuring fluorescence emission of fluorescein dye, correcting for optical interference.
Studied the depletion of a divalent anion (fluorescein) between anionic solid surfaces.

Main Results:

Observed a decrease in dye depletion with decreasing plate separation (confinement).
Found that the range and magnitude of depletion diminished with shorter Debye lengths.
Experimental results align with predictions from the Poisson-Boltzmann equation.

Conclusions:

Adsorption behavior is significantly modified by confinement in very thin films.
The study provides a direct method for measuring adsorption under confinement, applicable to various fluorescent probes.
Understanding these effects is vital for applications involving thin films, such as colloidal particle stabilization.