The stability of hydrophobic sols in the presence of surface active agents

1969 ◽  
Vol 232 (2) ◽  
pp. 804-811 ◽  
Author(s):  
M. C. Rastogi ◽  
O. N. Srivastava
Keyword(s):  
Surface Active Agents ◽  
Surface Active ◽  
The Stability

The stability of hydrophobic sols in the presence of surface active agents

1970 ◽  
Vol 239 (2) ◽  
pp. 701-706 ◽  
Author(s):  
M. C. Rastogi ◽  
O. N. Srivastava
Keyword(s):  
Surface Active Agents ◽  
Surface Active ◽  
The Stability

Bloat investigations

1955 ◽  
Vol 46 (2) ◽  
pp. 257-266 ◽  
Author(s):  
W. S. Ferguson ◽  
R. A. Terry
Keyword(s):  
Dairy Cows ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Single Test ◽  
Stable Foam ◽  
Egg Albumin ◽  
Surface Active Agents ◽  
Surface Active ◽  
Household Detergents ◽  
The Stability

An account is given of experimental work carried out at Jealott's Hill on bloat.Bloat was produced in dairy cows and sheep by dosing with lucerne juice. Sheep proved convenient test animals and were used in most of the tests described.Parenteral and intravenous administration of the flavone quercetin, which inhibits the activity of smooth muscle, did not cause bloat even in the presence of cyanide. It is unlikely that flavones are concerned in bloat.Fractionation of bloat-provoking lucerne juice showed that activity was retained after (a) precipitation of chloroplastic material, and (b) passage of clear juice through an anion or cation exchange resin. This suggests that the bloat-provoking factor is non-ionic and not adsorbed on resins—properties shown by saponinis.Dosing sheep with lucerne saponins, four other saponins, egg albumin and a synthetic foaming compound failed to produce bloat.Two household detergents and a number of surface-active agents did not relieve bloat, but foam-breaking compounds were very effective.A synthetic inorganic saliva and cow's saliva did not prevent bloat in sheep and from the single test made with cow's saliva it is not possible to say if it increased the severity of bloat.It is concluded that the formation of a stable foam is a major factor in lucerne bloat and that food constituents, other than saponins, and the physical condition of the rumen ingesta probably influence the stability of the foam.

scholarly journals Effect of organic and aqueous dispersion medium on the development of polystyrene nanoparticles in nanoprecipitation method

2014 ◽  
Vol 10 (1) ◽  
Author(s):  
Attaullah Bukhari ◽  
Ani Idris ◽  
Madiha Atta
Keyword(s):  
Aqueous Dispersion ◽  
Polymer Phase ◽  
Polystyrene Nanoparticles ◽  
Dispersion Phase ◽  
Surface Active Agents ◽  
Nanoprecipitation Method ◽  
Tween 40 ◽  
Surface Active ◽  
The Stability ◽  
Selection Of

The purpose of this study is to develop polystyrene nanoparticles using nanoprecipitation method. Formation of nanoparticles from pre-polymer by nanoprecipitation is a beneficial technique involving the diffusion of polymer phase into dispersion phase. However, selection of solvent /non-solvent couple has intensive influence on nanoprecipitation of specific polymer. In this study the potential of chloroform (CHCl3) and tetrahydrofuran (THF) is explored as the solvent for polystyrene. Effect of dispersion phase; methanol, chloroform, acetone and water have been investigated on nanoprecipitation of polystyrene. It was found that the addition of surfactants enhanced the stability of nanoparticles.Tween-40 has a more pronounced stabilizing effect than Pluronic F-68 on polystyrene nanoparticles in aqueous phase. More stable nanoparticles of polystyrene were obtained in the aqueous medium containing 2-g/L of Tween-40. Interface interaction of mixing phases and surface active agents affect the size and stability of nanoparticles in nanoprecipitation.

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