Surface active complexes formed between keratin polypeptides and ionic surfactants

2016 ◽  
Vol 484 ◽  
pp. 125-134 ◽  
Author(s):  
Fang Pan ◽  
Zhiming Lu ◽  
Ian Tucker ◽  
Sarah Hosking ◽  
Jordan Petkov ◽  
...  
Keyword(s):  
Ionic Surfactants ◽  
Keratin Polypeptides ◽  
Surface Active

scholarly journals Segregation versus Interdigitation in Highly Dynamic Polymer/Surfactant Layers

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 109 ◽  
Author(s):  
Omar Mansour ◽  
Beatrice Cattoz ◽  
Manon Beaube ◽  
Richard Heenan ◽  
Ralf Schweins ◽  
...  
Keyword(s):  
Weak Solution ◽  
Sodium Dodecylsulfate ◽  
Bulk Solution ◽  
Ionic Surfactants ◽  
Dodecyltrimethylammonium Bromide ◽  
Nanoscale Structures ◽  
Interfacial Structures ◽  
Surface Active ◽  
Polymer Surfactant ◽  
Active Block

Many polymer/surfactant formulations involve a trapped kinetic state that provides some beneficial character to the formulation. However, the vast majority of studies on formulations focus on equilibrium states. Here, nanoscale structures present at dynamic interfaces in the form of air-in-water foams are explored, stabilised by mixtures of commonly used non-ionic, surface active block copolymers (Pluronic®) and small molecule ionic surfactants (sodium dodecylsulfate, SDS, and dodecyltrimethylammonium bromide, C12TAB). Transient foams formed from binary mixtures of these surfactants shows considerable changes in stability which correlate with the strength of the solution interaction which delineate the interfacial structures. Weak solution interactions reflective of distinct coexisting micellar structures in solution lead to segregated layers at the foam interface, whereas strong solution interactions lead to mixed structures both in bulk solution, forming interdigitated layers at the interface.

scholarly journals Surface active properties of composite systems based on synthetic polyelectrolytes and non-ionic surfactants in saline medium

2014 ◽  
pp. 46-52
Author(s):  
Kainzhamal Omarova ◽  
Akbota Adilbekova ◽  
Sholpan Zhailaubaeva ◽  
Gulbahyt Ibragimova ◽  
Ainamkoz Karakulova
Keyword(s):  
Ionic Surfactants ◽  
Composite Systems ◽  
Surface Active Properties ◽  
Surface Active ◽  
Saline Medium

Effects of surfactants on the twitch tension of frog sartorius muscle

1964 ◽  
Vol 207 (2) ◽  
pp. 397-401 ◽  
Author(s):  
George D. Webb
Keyword(s):  
Nonionic Surfactants ◽  
Anionic Surfactants ◽  
Ionic Surfactants ◽  
Sartorius Muscle ◽  
Aerosol Ot ◽  
Surface Active Agents ◽  
Low Concentrations ◽  
Surface Active ◽  
Isometric Twitch ◽  
Frog Sartorius

Many types of cells show permeability increases to ions and to various uncharged molecules when exposed to surface-active agents (surfactants). Nonionic surfactants are less effective than ionic surfactants in increasing permeability and in depolarizing nerve and muscle cells. In the present experiments the strength of isometric twitch responses of directly stimulated frog sartorius muscles was measured. Ionic surfactants generally produced an irreversible decrease in the twitch response, whereas nonionic surfactants (at equimolar concentrations) had little effect. Aerosol OT conditioned muscles so that curare or neostigmine appeared to produce a decrease in the twitch tension of directly stimulated fibers. Possibly the Aerosol OT treatment increased the permeability of the conducting membrane, allowing curare and neostigmine to interact with the acetylcholine system proposed by Nachmansohn. The above observations could be accounted for by increases in permeability caused by the ionic surfactants. Two observations suggested additional actions of ionic surfactants: low concentrations of cetyltrimethylammonium produced a reversible decrease in twitch tension; low concentrations of anionic surfactants caused an increase in contractile tension.

Morphological behavior of compatibilized ternary blends prepared by mechanical mixing

1993 ◽  
Vol 51 ◽  
pp. 1200-1201
Author(s):  
S.D. Smith ◽  
R.J. Spontak ◽  
D.H. Melik ◽  
S.M. Buehler ◽  
K.M. Kerr ◽  
...  
Keyword(s):  
Interfacial Adhesion ◽  
Diblock Copolymers ◽  
Ternary Blends ◽  
Mechanical Mixing ◽  
Design Considerations ◽  
Covalently Bonded ◽  
Homopolymer Blends ◽  
Emulsifying Agent ◽  
Surface Active ◽  
Low Entropy

When blended together, homopolymers A and B will normally macrophase-separate into relatively large (≫1 μm) A-rich and B-rich phases, between which exists poor interfacial adhesion, due to a low entropy of mixing. The size scale of phase separation in such a blend can be reduced, and the extent of interfacial A-B contact and entanglement enhanced, via addition of an emulsifying agent such as an AB diblock copolymer. Diblock copolymers consist of a long sequence of A monomers covalently bonded to a long sequence of B monomers. These materials are surface-active and decrease interfacial tension between immiscible phases much in the same way as do small-molecule surfactants. Previous studies have clearly demonstrated the utility of block copolymers in compatibilizing homopolymer blends and enhancing blend properties such as fracture toughness. It is now recognized that optimization of emulsified ternary blends relies upon design considerations such as sufficient block penetration into a macrophase (to avoid block slip) and prevention of a copolymer multilayer at the A-B interface (to avoid intralayer failure).

Adsorption of ionic and non-ionic surfactants by wool charring waste

1981 ◽  
Vol 31 (1) ◽  
pp. 395-400 ◽  
Author(s):  
Francis Perineau ◽  
Antoine Gaset
Keyword(s):  
Ionic Surfactants
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