Characterization of diblock copolymer monolayers at the liquid-air interface by neutron reflectivity and surface tension measurements

1992 ◽  
Vol 25 (23) ◽  
pp. 6240-6247 ◽  
Author(s):  
Michael S. Kent ◽  
Lay Theng Lee ◽  
Bernard Farnoux ◽  
Francis Rondelez
Keyword(s):  
Surface Tension ◽  
Diblock Copolymer ◽  
Neutron Reflectivity ◽  
Air Interface

scholarly journals Neutron reflectivity and surface tension measurements of a diblock copolymer monolayer on a selective solvent

1993 ◽  
Vol 03 (C8) ◽  
pp. C8-49-C8-52 ◽  
Author(s):  
M. S. KENT ◽  
L. T. LEE ◽  
B. J. FACTOR ◽  
F. RONDELEZ ◽  
G. SMITH
Keyword(s):  
Surface Tension ◽  
Diblock Copolymer ◽  
Neutron Reflectivity ◽  
Selective Solvent

scholarly journals Adsorption Properties of Hydrocarbon and Fluorocarbon Surfactants Ternary Mixture at the Water-Air Interface

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4313
Author(s):  
Bronisław Jańczuk ◽  
Katarzyna Szymczyk ◽  
Anna Zdziennicka
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Standard Free Energy ◽  
Ternary Mixtures ◽  
Free Energy Of Adsorption ◽  
Interface Tension ◽  
Air Interface ◽  
Surface Excess Concentration ◽  
Tail Water ◽  
Triton X

Measurements were made of the surface tension of the aqueous solutions of p-(1,1,3,3-tetramethylbutyl) phenoxypoly(ethylene glycols) having 10 oxyethylene groups in the molecule (Triton X-100, TX100) and cetyltrimethylammonium bromide (CTAB) with Zonyl FSN-100 (FC6EO14, FC1) as well as with Zonyl FSO-100 (FC5EO10, FC2) ternary mixtures. The obtained results were compared to those provided by the Fainerman and Miller equation and to the values of the solution surface tension calculated, based on the contribution of a particular surfactant in the mixture to the reduction of water surface tension. The changes of the aqueous solution ternary surfactants mixture surface tension at the constant concentration of TX100 and CTAB mixture at which the water surface tension was reduced to 60 and 50 mN/m as a function of fluorocarbon surfactant concentration, were considered with regard to the composition of the mixed monolayer at the water-air interface. Next, this composition was applied for the calculation of the concentration of the particular surfactants in the monolayer using the Frumkin equation. On the other hand, the Gibbs surface excess concentration was determined only for the fluorocarbon surfactants. The tendency of the particular surfactants to adsorb at the water-air interface was discussed, based on the Gibbs standard free energy of adsorption which was determined using different methods. This energy was also deduced, based on the surfactant tail surface tension and tail-water interface tension.

Synthesis and characterization of thermoresponsive diblock copolymer bearing amino acid moieties via click reaction

2011 ◽  
Vol 68 (5) ◽  
pp. 1315-1325 ◽  
Author(s):  
Zhilei Liu ◽  
Jianping Zhou ◽  
Hongbo Liang ◽  
Jianping Sun
Keyword(s):  
Amino Acid ◽  
Diblock Copolymer ◽  
Click Reaction ◽  
Synthesis And Characterization

scholarly journals Characterization of Alkanolamine Blends for Carbon Dioxide Absorption. Corrosion and Regeneration Studies

2021 ◽  
Vol 13 (7) ◽  
pp. 4011
Author(s):  
Alfredo Sánchez-Bautista ◽  
Ester M. Palmero ◽  
Alberto J. Moya ◽  
Diego Gómez-Díaz ◽  
M. Dolores La Rubia
Keyword(s):  
Carbon Dioxide ◽  
Surface Tension ◽  
Energy Consumption ◽  
Absorption Rate ◽  
Carbon Dioxide Capture ◽  
Regeneration Capacity ◽  
Carbon Dioxide Absorption ◽  
Research Programs ◽  
A Priority

There are a lot of research programs focusing on the development of new solvents for carbon dioxide capture. The most important priority should be reducing the energy consumption needed at the regeneration step, but minimizing solvent degradation and its corrosivity is also considered as a priority. In this research, the aqueous blends of 2-amino-2-methyl-1-propanol (AMP: 1 kmol·m−3) and 1-amino-2-propanol (MIPA: 0.1–0.5 kmol·m−3) are characterized in terms of density, viscosity, and surface tension. The carbon dioxide absorption rate and capacity, the regeneration capacity, and the corrosivity of these solvents are also evaluated.

The Chorionic Plastron and its Role in the Eggs of the Muscinae (Diptera)

1960 ◽  
Vol s3-101 (55) ◽  
pp. 313-332
Author(s):  
H. E. HINTON
Keyword(s):  
Surface Tension ◽  
High Pressures ◽  
Middle Layer ◽  
Clean Water ◽  
Active Materials ◽  
Great Resistance ◽  
Plane Normal ◽  
Air Interface ◽  
Surface Active ◽  
Egg Shell

In flies of the subfamily Muscinae the egg-shell has both an outer and an inner meshwork layer, each of which holds a continuous film of air. Between these two meshwork layers there is a more or less thick middle layer to which the shell chiefly owes its mechanical strength. Holes or aeropyles through the middle layer effect the continuity of the outer and inner films of air. Both meshwork layers consist of struts that arise perpendicularly from the middle layer. In both layers the struts are branched at their apices in a plane normal to their long axes. These horizontal branches form a fine and open hydrofuge network that provides a large water-air interface when the egg is immersed. When it rains or when the egg is otherwise immersed in water, the film of air held in the outer meshwork layer of the shell funtions as a plastron. To be an efficient respiratory structure a plastron must resist wetting by both the hydrostatic pressures and the surface active materials to which it is normally exposed. The plastrons of all the Muscinae tested resist wetting in clean water by pressures far in excess of any they are likely to encounter in nature. The resistance of a plastron to hydrostatic pressures varies directly as the surface tension of the water, and the surface tension of water in contact with the decomposing materials in which the Muscinae lay their eggs is much lowered by surface active materials. These considerations seem to provide an explanation for the great resistance of the plastron of the Muscinae to wetting by excess pressures and for the paradox that the plastrons of these terrestrial eggs are more resistant to high pressures than are the plastrons of some aquatic insects that live in clean water.

scholarly journals Properties of the seawater-air interface. Dynamic surface tension studies1

1979 ◽  
Vol 24 (6) ◽  
pp. 1022-1030 ◽  
Author(s):  
Dj. Dragcevic ◽  
M. Vukovic ◽  
D. Cukman ◽  
V. Pravdic
Keyword(s):  
Surface Tension ◽  
Dynamic Surface Tension ◽  
Dynamic Surface ◽  
Air Interface ◽  
Interface Dynamic

scholarly journals Production and characterization of sophorolipids produced by Candida bombicola from coconut oil

2016 ◽  
Vol 19 (4) ◽  
pp. 15-25
Author(s):  
Loan Quynh Le ◽  
Huy Duc Ngo ◽  
Khanh Quoc Hoang ◽  
Dung Hoang Nguyen ◽  
Dung Hoang Nguyen ◽  
...  
Keyword(s):  
Surface Tension ◽  
Coconut Oil ◽  
Environmentally Friendly ◽  
Candida Bombicola ◽  
Lower Toxicity ◽  
E Coli ◽  
Microbial Origin

The biosurfactants from microbial origin increasingly gained interests because of their application in many field and excellent properties compared to surfactants from chemical origin, such as the higher biodegradability, lower toxicity and environmentally friendly. Sophorolipids, biosurfactants of glycolipid groups are produced through the fermentation by nonpathogenic yeasts such as Candida bombicola. In this study, we investigated the production, surveyed properties of sophorolipids through fermentation by C. bombicola from coconut oil. The results showed that the yield of sophorolipid obtained after 7 days of culture was 14.6 g/L, the surface tension was 40 mN/m. The obtained sophorolipid showed ability to be resistant to some bacteria such as E. coli, B. subtilis, P. aeruginosa, and S. aureus. Through DPPH experiment, sophorolipids showed the scavenging acitivity with IC50 = 1.4063 mg/mL. These results showed that sophorolipids could be applied in cosmetics.

In situ neutron reflectivity studies of the adsorption of DNA by charged diblock copolymer monolayers at the air–water interface

Soft Matter ◽  
2012 ◽  
Vol 8 (27) ◽  
pp. 7161 ◽  
Author(s):  
Po-Wei Yang ◽  
Tsang-Lang Lin ◽  
I-Ting Liu ◽  
Yuan Hu ◽  
Michael James
Keyword(s):  
Diblock Copolymer ◽  
Neutron Reflectivity ◽  
Water Interface ◽  
Air Water Interface
Sign in / Sign up

Export Citation Format

Share Document