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Adsorption of Gases on Solids

Adsorption of Gases on Solids

Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...

Adsorption Isotherms II

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...

Surface Tension, Capillary Action, and Viscosity

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...

Noncovalent Attractions in Biomolecules

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...

Noncovalent Attractions in Biomolecules

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...

Adhesion

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...

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Updated: Jun 10, 2026

Monitoring Protein Adsorption with Solid-state Nanopores

Monitoring Protein Adsorption with Solid-state Nanopores

Published on: December 2, 2011

Water structure at solid surfaces and its implications for biomolecule adsorption.

Kailash C Jena¹, Dennis K Hore

¹Department of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada.

Physical Chemistry Chemical Physics : PCCP

|August 18, 2010

Summary

This summary is machine-generated.

Understanding water

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Monitoring Protein Adsorption with Solid-state Nanopores

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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

Area of Science:

Surface Science
Physical Chemistry
Biophysics

Background:

Water molecules exhibit ordered arrangements at solid surfaces due to various interactions.
Interfacial water structure is crucial for understanding surface phenomena and biomolecular interactions.

Purpose of the Study:

To review recent advancements in understanding water structure at the solid-liquid interface.
To highlight the role of interfacial water organization in biomolecular adsorption.

Main Methods:

Experimental techniques: attenuated total internal reflection infrared spectroscopy, second harmonic generation spectroscopy, and vibrationally-resonant sum-frequency generation spectroscopy.
Computational approaches: molecular dynamics and Monte Carlo simulations.

Main Results:

Recent studies provide detailed insights into the organization of water molecules at solid-liquid interfaces.
Specific interfacial water structures are revealed by the discussed experimental and simulation methods.

Conclusions:

Interfacial water organization significantly influences the structure and behavior of adsorbed biomolecules.
Advanced spectroscopic and simulation techniques are essential for elucidating these interfacial phenomena.