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Facts At Your Fingertips: Adsorption bonding

By Scott Jenkins |

Physical adsorption phenomena play a critical role in many separation and purification processes, including separations of industrial gases, purification of gases, moisture removal from fluids, water purification and others. Adsorption is a surface phenomenon in which a fluid (gas or liquid) molecule attaches to the surface of a material by physical forces known as Van der Waals interactions. This one-page reference discusses the nature of Van der Waals forces, and their role in adsorption processes, with a focus on London dispersion forces. Van der Waals forces Van der Waals forces is a general term that describes the relatively weak (compared to typical covalent bond strengths) intermolecular forces that result from individual electrostatic attractions between otherwise non-attracting atoms and molecules. Van der Waals interactions can be classified into three categories, as follows: Hydrogen bonds. Hydrogen bonds form between H atoms — that acquire significant positive charge from being bound to electronegative elements — and negatively charged lone electron pairs on adjacent molecules. The most important H-bonds form with hydroxide and amide groups. Hydrogen bonds have strengths ranging from 5 to 50 kJ/mol. Dipole-dipole…
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