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  2. Chemisorption - Wikipedia

    en.wikipedia.org/wiki/Chemisorption

    Chemisorption is a kind of adsorption which involves a chemical reaction between the surface and the adsorbate. New chemical bonds are generated at the adsorbent surface. Examples include macroscopic phenomena that can be very obvious, like corrosion [clarification needed], and subtler effects associated with heterogeneous catalysis, where the catalyst and reactants are in different pha

  3. Langmuir adsorption model - Wikipedia

    en.wikipedia.org/wiki/Langmuir_adsorption_model

    The following hypotheses are made here: All the sites are equivalent. Each site can hold at most one molecule of A, or one molecule of B, but not both simultaneously. There are no interactions between adsorbate molecules on adjacent sites. As derived using kinetic considerations, the equilibrium constants for both A and B are given by

  4. BET theory - Wikipedia

    en.wikipedia.org/wiki/BET_theory

    gas molecules only interact with adjacent layers; and; the Langmuir theory can be applied to each layer. the enthalpy of adsorption for the first layer is constant and greater than the second (and higher). the enthalpy of adsorption for the second (and higher) layers is the same as the enthalpy of liquefaction. The resulting BET equation is

  5. Adsorption - Wikipedia

    en.wikipedia.org/wiki/Adsorption

    The presence of the metal serves as a lower-energy pathway for gaseous species to first adsorb to the metal and then diffuse on the support surface. This is possible because the adsorbed species attains a lower energy state once it has adsorbed to the metal, thus lowering the activation barrier between the gas phase species and the support ...

  6. Physisorption - Wikipedia

    en.wikipedia.org/wiki/Physisorption

    In chemisorption, molecules are adsorbed on the surface by valence bonds and only form monolayer adsorption. A direct transition from physisorption to chemisorption has been observed by attaching a CO molecule to the tip of an atomic force microscope and measuring its interaction with a single iron atom. [12]

  7. Photodissociation - Wikipedia

    en.wikipedia.org/wiki/Photodissociation

    There are strong indications that long gamma-ray bursts preferentially or exclusively occur in regions of low metallicity. Because the Milky Way has been metal-rich since before the Earth formed, this effect may diminish or even eliminate the possibility that a long gamma-ray burst has occurred within the Milky Way within the past billion years ...

  8. Heterogeneous catalysis - Wikipedia

    en.wikipedia.org/wiki/Heterogeneous_catalysis

    Vapor-solid reactions: formation of an inactive surface layer and/or formation of a volatile compound that exits the reactor. [22] This results in a loss of surface area and/or catalyst material. Solid-state transformation : solid-state diffusion of catalyst support atoms to the surface followed by a reaction that forms an inactive phase.

  9. Self-assembled monolayer - Wikipedia

    en.wikipedia.org/wiki/Self-assembled_monolayer

    Metal substrates for use in SAMs can be produced through physical vapor deposition techniques, electrodeposition or electroless deposition. [1] Thiol or selenium SAMs produced by adsorption from solution are typically made by immersing a substrate into a dilute solution of alkane thiol in ethanol, though many different solvents can be used [1] besides use of pure liquids. [16]

  1. Related searches chemisorption results in unimolecular layer called the wall made of metal

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