surface-active agent


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surface-active agent

[′sər·fəs ¦ak·tiv ′ā·jənt]
(materials)
A soluble compound that reduces the surface tension of liquids, or reduces interfacial tension between two liquids or a liquid and a solid. Also known as surfactant.

surface-active agent

1. In unhardened mixtures of concrete, an additive which has the ability to modify the surface tension of the mixing water, thereby facilitating the wetting and penetrating action of the water, and/or assisting the emulsifying, dispersing, solubilizing, foaming, or frothing of other additives.
2. Same as surfactant.
References in periodicals archive ?
To this end, we used two different surface-active agents, the detergent Tween 20 and ethanol, to decrease the surface tension of the water.
For the more surface-active agents, large deviations between the surface tension-bubble life time isotherms are observed, which is an indicator that the frothing agents accumulated in the foam.
The cleansing composition has an improved average foam stability ranging between 35-60mm according to the foam stability test, wherein the ratio of surface-active agent to oil is in the range of 1:0.6-1:0.8.
Platinum DD: An aqueous blend of surface-active agents, Platinum DD is designed to reduce the surface tension of all water-base mud systems and reduce the sticking tendency of water-sensitive shale cuttings.
The surfactants, such as nonoxynol-9 (1) and SAVVY, (2,3) are membrane surface-active agents. Although surfactants kill HIV in vitro, their limited activity in humans probably reflects their impact on human cells: Anything that is membrane active will also probably affect human cells as well as HIV.

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