Conformational Changes of Poly(N-isopropylacrylamide) Chains at Air/Water Interface:  Effects of Temperature, Compression Rate, and Packing Density

2007 ◽  
Vol 111 (14) ◽  
pp. 3633-3639 ◽  
Author(s):  
Guangming Liu ◽  
Shihe Yang ◽  
Guangzhao Zhang
Keyword(s):  
Conformational Changes ◽  
Packing Density ◽  
Compression Rate ◽  
Water Interface ◽  
Air Water Interface ◽  
Effects Of Temperature ◽  
Interface Effects

Adsorption of Nonionic Mixtures at the Air–Water Interface: Effects of Temperature and Electrolyte

2002 ◽  
Vol 247 (2) ◽  
pp. 404-411 ◽  
Author(s):  
J. Penfold ◽  
E. Staples ◽  
I. Tucker ◽  
L. Thompson ◽  
R.K. Thomas
Keyword(s):  
Water Interface ◽  
Air Water Interface ◽  
Effects Of Temperature ◽  
Interface Effects

Metastability in Monolayer Films Transferred onto Solid Substrates by the Langmuir-Blodgett Method: IR Evidence for Transfer-Induced Phase Transitions

1994 ◽  
Vol 48 (10) ◽  
pp. 1196-1203 ◽  
Author(s):  
Fazale R. Rana ◽  
Suci Widayati ◽  
Brian W. Gregory ◽  
Richard A. Dluhy
Keyword(s):  
Fatty Acid ◽  
Conformational Changes ◽  
Structural Changes ◽  
High Surface ◽  
Solid Substrate ◽  
Water Interface ◽  
Monolayer Films ◽  
Langmuir Blodgett ◽  
Monomolecular Film ◽  
Air Water Interface

The rate at which a monomolecular film is deposited onto a solid substrate in the Langmuir-Blodgett process of preparing supported monolayer films influences the final structure of the transferred film. Attenuated total reflectance infrared spectroscopic studies of monolayers transferred to germanium substrates show that the speed at which the substrate is drawn through the air/water interface influences the final conformation in the hydrocarbon chains of amphiphilic film molecules. This transfer-induced effect is especially evident when the monolayer is transferred from the expanded region of surface-pressure-molecular-area isotherms at low surface pressures; the effect is minimized when the film molecules are transferred from condensed phases at high surface pressures. This phenomenon has been observed for both a fatty acid and a phospholipid, which suggests that these conformational changes may occur in a variety of hydrocarbon amphiphiles transferred from the air/water interface. This conformational ordering may be due to a kinetically limited phase transition taking place in the meniscus formed between the solid substrate and aqueous subphase. In addition, the results obtained for both the phospholipid and fatty acid suggest that the structure of the amphiphile may help determine the extent and nature of the transfer-speed-induced structural changes taking place in the monomolecular film.

Conformational changes of ovalbumin adsorbed at the air-water interface and properties of the interfacial film

2007 ◽  
pp. 152-159
Author(s):  
Stéphane Pezennec ◽  
Emmanuel Terriac ◽  
Bernard Desbat ◽  
Thomas Croguennec ◽  
Sylvie Beaufils ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Water Interface ◽  
Interfacial Film ◽  
Air Water Interface

scholarly journals Simulation of Air–Water Interface Effects for High-speed Planing Hull

2020 ◽  
Vol 19 (3) ◽  
pp. 398-414
Author(s):  
Naga Venkata Rakesh Nimmagadda ◽  
Lokeswara Rao Polisetty ◽  
Anantha Subramanian Vaidyanatha Iyer
Keyword(s):  
High Speed ◽  
Water Interface ◽  
Fluid Forces ◽  
Transition Speed ◽  
High Speeds ◽  
Air Water Interface ◽  
Practical Design ◽  
Actual Flow ◽  
Wetted Surface Area ◽  
Interface Effects

Abstract High-speed planing crafts have successfully evolved through developments in the last several decades. Classical approaches such as inviscid potential flow–based methods and the empirically based Savitsky method provide general understanding for practical design. However, sometimes such analyses suffer inaccuracies since the air–water interface effects, especially in the transition phase, are not fully accounted for. Hence, understanding the behaviour at the transition speed is of fundamental importance for the designer. The fluid forces in planing hulls are dominated by phenomena such as flow separation at various discontinuities viz., knuckles, chines and transom, with resultant spray generation. In such cases, the application of potential theory at high speeds introduces limitations. This paper investigates the simulation of modelling of the pre-planing behaviour with a view to capturing the air–water interface effects, with validations through experiments to compare the drag, dynamic trim and wetted surface area. The paper also brings out the merits of gridding strategies to obtain reliable results especially with regard to spray generation due to the air–water interface effects. The verification and validation studies serve to authenticate the use of the multi-gridding strategies on the basis of comparisons with simulations using model tests. It emerges from the study that overset/chimera grids give better results compared with single unstructured hexahedral grids. Two overset methods are investigated to obtain reliable estimation of the dynamic trim and drag, and their ability to capture the spray resulting from the air–water interaction. The results demonstrate very close simulation of the actual flow kinematics at steady-speed conditions in terms of spray at the air–water interface, drag at the pre-planing and full planing range and dynamic trim angles.

Adsorption behavior and conformational changes of acrylpimaric acid polyglycol esters at the air-water interface

Polymer ◽  
2017 ◽  
Vol 132 ◽  
pp. 235-242 ◽  
Author(s):  
Juying Zhou ◽  
Xia Zhang ◽  
Yanjiao Lan ◽  
Yanzhi Zhao ◽  
Fuhou Lei ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Adsorption Behavior ◽  
Water Interface ◽  
Air Water Interface

Calcium phosphate growth beneath a polycationic monolayer at the air–water interface: effects of oscillating surface pressure on mineralization

Nanoscale ◽  
2010 ◽  
Vol 2 (11) ◽  
pp. 2440 ◽  
Author(s):  
Mathias Junginger ◽  
Katrin Bleek ◽  
Katarzyna Kita-Tokarczyk ◽  
Jürgen Reiche ◽  
Andriy Shkilnyy ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Surface Pressure ◽  
Water Interface ◽  
Air Water Interface ◽  
Interface Effects
Sign in / Sign up

Export Citation Format

Share Document