(4) process by which atoms, molecules or ions are retained on the surfaces of solids by chemical or physical binding. Not to be confused with absorption, which is the uptake of a gas by a solid or liquid, or a liquid by a solid.
The process of removing natural gas liquids from a stream of natural gas by passing the natural gas through granular solids which have a natural attraction to the liquids to be removed from the stream.
The extraction from a mixture of gases or liquids of one or more components, by surface adhesion to that material with which the gases or liquids come in contact. The adsorption or extraction process does not cause and is not accompanied by either a physical or chemical change in the sorbent material. Compare ABSORPTION.
The natural phenomenon of a gas, vapour, or liquid being attracted to, and held on, the surface of a solid. To some extent, adsorption takes place on any solid surface, but certain materials have sufficient adsorbent capacity because of the finely divided material to make them useful in such industrial applications as the purification and separation of gases and liquids.
Molecules of gas, liquid, or dissolved solids that adhere or "stick" to the surfaces they come in contact with. Some chemicals adsorb strongly to soil particles. This differs from absorb: "to take up or make part of the existing whole," like a sponge absorbs (sucks up) water.
Adsorption (or sorption) is the transfer of solute from the fluid onto the solid. Solute adsorbed onto the solid is called adsorbate. SUTRA offers a choice of three equilibrium adsorption models: linear, Freundlich, and Langmuir. See Section 2.4 of the SUTRA documentation for details.
Adsorption, which is often confused with absorption, refers to the adhering of molecules of gases and liquids to the surfaces of porous solids. Adsorption is a surface phenomenon; absorption is an intermingling or interpenetration of two substances.
The attachment, through physical or chemical bonding, of gas molecules to the coal surface. The adsorbed gas molecules are trapped within the coal, the stability of which is strongly affected by changes in temperature and pressure.
The adherence of atoms, ions or molecules of a gas or liquid to the surface of another substance. Finely divided or microporous materials having a large active surface area are strong adsorbents. Examples include activated carbon, activated alumina and silica gel.
Process in which a substance (gas or liquid) is held in the surface of a solid. In the adsorption process it is verified the formation of a layer of gas or liquid on the surface of a solid. The adsorption can be chemical or physic. In the chemical adsorption, the adsorbed substance reacts with the adsorbent surface having the formation of chemical bounds. On the other hand, in physical adsorption there isn't the formation of chemical bounds. The molecules are adsorbed through Van der Walls forces.
If any compound, solid, liquid or gas, is loosely held by weak attraction to the surface of a solid it is said to have undergone adsorption. This process is much weaker and less permanent than absorption.
The adhesion, in an extremely thin layer of molecules, of one material to the surface of another. Engelhard adsorbents and absorbents selectively attract materials that our customers want isolated - for example, impurities in vegetable and motor oils.
The process whereby vapor phase compounds in the gas stream pass through a bed or layer of highly porous material (adsorbent). The vapor phase compounds diffuse to the surface of the adsorbent and are retained due to weak attractive forces.
The surface retention of solid, liquid or gas molecules, atoms or ions by a solid or liquid. The adsorbed material is held in place by Van der Waals and other weak inter-molecular forces and is not readily displaced.
the accumulation or concentration of a substance on a surface. There are two types; physical adsorption where molecules are attracted and become physically attached to a surface by intermolecular forces of attraction and chemical adsorption in which molecules, atoms or ions are attached to a surface by chemical bonds. Flocculant adsorption to mineral particles is a combination of both types.
The retention of gas molecules on a solid surface known as the adsorbent. Adsorption is used either to separate gases (e.g., nitrogen from oxygen) or purify them. For example, water, CO2 or hydrocarbons may be removed from air gas before separation by a cryogenic air separation unit.
Not to be confused with absorption, adsorption is the build up of a molecule at a surface. Adsorption generally occurs because different parts of a molecule have an affinity for the two different phases on either side of the interface. Syn. Physical adsorption
Physical adhesion of vapor or dissolved matter to the surface of a solid. The term also refers to a method of treating wastes in which activated carbon removes organic matter from wastewater. Unless it is certain that adsorption is occurring, as opposed to absorption, the term sorption should be used.
adsorb; adsorbed. Compare with absorption and sorption. Adsorption is collection of a substance on the surface of a solid or a liquid. For example, gases that make water taste bad are strongly adsorbed on charcoal granules in water filters.
migration of a material onto the surface of a solid so that part or all of the surface is covered with a layer of the material that is intimately joined to it and will resist removalaging oven - an air oven, usually laboratory scale, that is used to expose rubber test specimens to elevated temperatures in an accelerated test of the compound's resistance to normal aging
Build up of a molecule at a surface. Not to be confused with absorption. Adsorption generally occurs because different parts of a molecule have an affinity for the two different phases on either side of the interface.
The process of interaction between the solute and the surface of an adsorbent. The forces involved can be strong such as hydrogen bonds, or weak such as van der Waals forces. For silica gel, the silanol group is the driving force for adsorption, and any solute functional group that can interact with this group can be retained by liquid-solid chromatography on silica.
The formation of a layer of gas, liquid or solid onto the surface of another solid. The layer is held in place by either chemical attraction (Chemisorption) or by weak van der Waal forces (Physisorption). Less commonly a phase may be adsorbed onto a liquid.
Adsorption: an atom or Molecule of a gas or liquid adds on inner surface of the adsorbent. “Absorption”, by contrast, means the bedding of an atom or molecule into the free volume of a solid body of fluid. The opposite, the delivery of atoms/molecules, is called “desorption”.
A process in which molecules are attracted to and retained on a surface (compare with absorption). In water treatment, the large surface area of activated carbon is used to remove low concentrations of contaminants.
Adhesion of the molecules of gases, liquids, or dissolved substances to a solid surface, resulting in relatively high concentration of the molecules at the place of contact; e.g. the plating out of an anti-wear additive on metal surfaces.
A type of adhesion that occurs at the surface of a solid or liquid in contact with another medium, thus allowing an increased number of molecules of the gas or liquid to become attached to the surface of the solid at the point of contact.
Adhesion of molecules of gases, liquids, or dissolved substances to the surface of a solid or liquid, forming a molecular or atomic film. In biomed applications, this undesired affect is also called "fouling." It is different from absorption, where a substance diffuses into a liquid or solid to form a "solution."
The concentration of molecules of one or more specific elements or compounds at a phase boundary, usually at a solid surface bounding a liquid or gaseous medium containing the specific element or compound.
The process by which filter media attracts unwanted molecules to its surface via a chemical charge. Adventitious root A root which develops from the node of a stem or similar organ, such as a Rhizome, Stolan or runner.
Retention of gas, liquid, solid or a dissolved substance on a surface due to positive interaction (attraction) between the surface and the molecules of the adsorbed material. The interactive forces can be electrostatic (coulombic) or nonelectrostatic (dipole-dipole and hydrophobic). Adsorption to a membrane or filter device can occur in a specific manner (affinity) or nonspecifically.
The action, associated with the surface adherence, of a material in extracting one or more substances present in an atmosphere or mixture of gases and liquids, unaccompanied by physical or chemical change. Commercial adsorbent materials have enormous internal surfaces.
The bonding, usually temporary, of ions or compounds to the surfaces of a solid, such as a calcium ion held on the surface of a clay crystal or a humus particle, where it may be absorbed by a plant root. See Absorption
Removal of a pollutant from air or water by collecting the pollutant on the surface of a solid material; e.g., an advanced method of treating waste in which activated carbon removes organic matter from waste-water.
Adsorption is a process that occurs when a gas or liquid solute accumulates on the surface of a solid or, more rarely, a liquid (adsorbent), forming a molecular or atomic film (the adsorbate). It is different from absorption, in which a substance diffuses into a liquid or solid to form a solution. The term sorption encompasses both processes, while desorption is the reverse process.
Storage products. When a hard disk drive is left unused for a long period of time, the head may stick to the disk so the spindle motor does not start. This state is called adsorption. Adsorption is likely to occur when the HDD is exposed to humidity in excess of the limit specified in the device specifications for a long time.