The dynamic spreading of nanofluids on solid surfaces – Role of the nanofilm structural disjoining pressure

2016 ◽  
Vol 470 ◽  
pp. 22-30 ◽  
Author(s):  
Sangwook Lim ◽  
Hua Zhang ◽  
Pingkeng Wu ◽  
Alex Nikolov ◽  
Darsh Wasan
Keyword(s):  
Disjoining Pressure ◽  
Solid Surfaces ◽  
Structural Disjoining Pressure

Wetting and Spreading of Nanofluids on Solid Surfaces Driven by the Structural Disjoining Pressure: Statics Analysis and Experiments

Langmuir ◽  
2011 ◽  
Vol 27 (7) ◽  
pp. 3324-3335 ◽  
Author(s):  
Kirti Kondiparty ◽  
Alex Nikolov ◽  
Stanley Wu ◽  
Darsh Wasan
Keyword(s):  
Disjoining Pressure ◽  
Solid Surfaces ◽  
Structural Disjoining Pressure

Multiple interactions in riverine biofilms - surfactant adsorption, bacterial attachment and biodegradation

1995 ◽  
Vol 31 (1) ◽  
pp. 61-70 ◽  
Author(s):  
Graham F. White
Keyword(s):  
Organic Pollutants ◽  
Bacterial Attachment ◽  
Solid Surfaces ◽  
Sediment Surface ◽  
Liquid Interfaces ◽  
Polluted Soils ◽  
Biofilm Bacteria ◽  
The Impact ◽  
Multiple Interactions

Many organic pollutants, especially synthetic surfactants, adsorb onto solid surfaces in natural and engineered aquatic environments. Biofilm bacteria on such surfaces make major contributions to microbial heterotrophic activity and biodegradation of organic pollutants. This paper reviews evidence for multiple interactions between surfactants, biodegradative bacteria, and sediment-liquid interfaces. Biodegradable surfactants e.g. SDS, added to a river-water microcosm were rapidly adsorb to sediment surface and stimulated the indigenous bacteria to attach to the sediment particles. Recalcitrant surfactants and non-surfactant organic nutrients did not stimulate attachment Attachment of bacteria was maximal when biodegradation was fastest, and was reversed when biodegradation was complete. Dodecanol, the primary product of SDS-biodegradation, markedly stimulated attachment. When SDS was added to suspensions containing sediment and either known degraders or known non-degraders, only the degraders became attached, and attachment accelerated surfactant biodegradation to dodecanol. These cyclical cooperative interactions have implications for the design of biodegradability-tests, the impact of surfactant adjuvants on biodegradability of herbicides/pesticides formulated with surfactants, and the role of surfactants used to accelerate bioremediation of hydrocarbon-polluted soils.

Sign in / Sign up

Export Citation Format

Share Document