Interfacial properties of polyelectrolyte complexes incorporating kraft lignin 10th EWLP, Stockholm, Sweden, August 25–28, 2008

Holzforschung ◽  
2009 ◽  
Vol 63 (6) ◽  
Author(s):  
Galia Shulga ◽  
Vadims Shakels ◽  
Olga Aniskevicha ◽  
Julia Zakharova ◽  
Sanita Skudra
Keyword(s):  
Surface Activity ◽  
Polyelectrolyte Complex ◽  
Synergetic Effect ◽  
Kraft Lignin ◽  
Water Interface ◽  
Polyelectrolyte Complexes ◽  
Dimethylaminoethyl Methacrylate ◽  
Air Water Interface ◽  
Decreasing Ph ◽  
Increasing Temperature

Abstract Surface tension of kraft lignin (KL) and KL/poly(N,N-dimethylaminoethyl methacrylate) mixtures, with different composition at the air-water interface depending on pH and temperature, was measured. It was found that the surface activity of both KL and the reaction mixtures grows with decreasing pH and increasing temperature. At the same time, the surface activity of the KL/poly(N,N-dimethylaminoethyl methacrylate) reaction mixture, irrespective of its composition under the same environment conditions, considerably exceeds the surface activity of KL, indicating the synergetic effect governed by the peculiarities of the polymeric structure of the formed soluble particles of the polyelectrolyte complex.

Surface activity of perfluorodecanoyl end-capped poly(ethylene oxide) and associated adsorption behavior to the air–water interface

Polymer ◽  
1998 ◽  
Vol 39 (19) ◽  
pp. 4655-4664 ◽  
Author(s):  
Zhaohui Su ◽  
Thomas J McCarthy ◽  
Shaw ling Hsu ◽  
Howard D Stidham ◽  
Zhongyong Fan ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Surface Activity ◽  
Adsorption Behavior ◽  
Water Interface ◽  
Air Water Interface ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Surface activity and collective behaviour of colloidally stable Janus-like particles at the air–water interface

Soft Matter ◽  
2014 ◽  
Vol 10 (19) ◽  
pp. 3471 ◽  
Author(s):  
M. A. Fernández-Rodríguez ◽  
M. A. Rodríguez-Valverde ◽  
M. Cabrerizo-Vílchez ◽  
R. Hidalgo-Alvarez
Keyword(s):  
Surface Activity ◽  
Collective Behaviour ◽  
Water Interface ◽  
Air Water Interface

scholarly journals Surface characteristics of phosphatidylglycerol phosphate from the extreme halophile Halobacterium cutirubrum compared with those of its deoxy analogue, at the air/water interface

1989 ◽  
Vol 261 (2) ◽  
pp. 377-381 ◽  
Author(s):  
P J Quinn ◽  
M Kates ◽  
J F Tocanne ◽  
M Tomoaia-Cotişel
Keyword(s):  
Surface Characteristics ◽  
Water Interface ◽  
Extreme Halophile ◽  
Molecular Area ◽  
Counter Ions ◽  
Nacl Concentration ◽  
Air Water Interface ◽  
Decreasing Ph ◽  
Compression Isotherms ◽  
The Relationship

The relationship between area per molecule and surface pressure of monolayers of phosphatidylglycerol phosphate from extreme halophile Halobacterium cutrirubrum and its deoxy analogue, deoxyphosphatidylglycerol phosphate, spread at an air/water interface was examined. The effect of ionization of the primary and secondary acidic functions of the phosphate groups of the two lipids on surface characteristics of compression isotherms was determined by spreading monolayers on subphases with pH values ranging from below the apparent pKa of the primary ionization (pH 0) to greater than that of secondary ionization (pH 10.9). The limiting molecular area increases with decreasing pH below 2. Ionization of the primary phosphate functions of both phospholipids (with bulk pK1 values close to 4) is associated with a marked expansion of the films, as judged by values of limiting molecular area. Ionization of the secondary phosphate functions causes further expansion of the films, with the apparent pK2 of deoxyphosphatidylglycerol phosphate slightly less than that indicated for phosphatidylglycerol phosphate. Values of surface-compressibility modulus calculated from the surface characteristics of the phosphatidylglcerol phosphate monolayers showed that films spread on subphases with a pH of about the apparent pK1 of the primary phosphate functions were the least compressible. Increasing or decreasing subphase pH caused an increase in compressibility; this effect on compressibility was much less with monolayers of deoxyphosphatidylglycerol phosphate at high pH. The effect of inorganic counter-ions on monolayer characteristics of phosphatidylglycerol phosphate was examined by using subphases of NaCl concentrations varying from 0.01 to 1 M. The limiting molecular area was found to increase exponentially with respect to the subphase NaCl concentration.

Surface Activity and Molecular Organization of Metallacarboranes at the Air–Water Interface Revealed by Nonlinear Optics

Langmuir ◽  
2015 ◽  
Vol 31 (8) ◽  
pp. 2297-2303 ◽  
Author(s):  
Pierre-Marie Gassin ◽  
Luc Girard ◽  
Gaelle Martin-Gassin ◽  
Damien Brusselle ◽  
Alban Jonchère ◽  
...  
Keyword(s):  
Nonlinear Optics ◽  
Surface Activity ◽  
Molecular Organization ◽  
Water Interface ◽  
Air Water Interface

scholarly journals Interaction Energy Analysis of Monovalent Inorganic Anions in Bulk Water Versus Air/Water Interface

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6719
Author(s):  
John M. Herbert ◽  
Suranjan K. Paul
Keyword(s):  
Surface Activity ◽  
Mechanical Energy ◽  
Decomposition Analysis ◽  
Bulk Water ◽  
Active Species ◽  
Energy Decomposition Analysis ◽  
Water Interface ◽  
Surface Activities ◽  
Air Water Interface ◽  
Surface Active

Soft anions exhibit surface activity at the air/water interface that can be probed using surface-sensitive vibrational spectroscopy, but the structural implications of this surface activity remain a matter of debate. Here, we examine the nature of anion–water interactions at the air/water interface using a combination of molecular dynamics simulations and quantum-mechanical energy decomposition analysis based on symmetry-adapted perturbation theory. Results are presented for a set of monovalent anions, including Cl−, Br−, I−, CN−, OCN−, SCN−, NO2−, NO3−, and ClOn− (n=1,2,3,4), several of which are archetypal examples of surface-active species. In all cases, we find that average anion–water interaction energies are systematically larger in bulk water although the difference (with respect to the same quantity computed in the interfacial environment) is well within the magnitude of the instantaneous fluctuations. Specifically for the surface-active species Br−(aq), I−(aq), ClO4−(aq), and SCN−(aq), and also for ClO−(aq), the charge-transfer (CT) energy is found to be larger at the interface than it is in bulk water, by an amount that is greater than the standard deviation of the fluctuations. The Cl−(aq) ion has a slightly larger CT energy at the interface, but NO3−(aq) does not; these two species are borderline cases where consensus is lacking regarding their surface activity. However, CT stabilization amounts to <20% of the total induction energy for each of the ions considered here, and CT-free polarization energies are systematically larger in bulk water in all cases. As such, the role of these effects in the surface activity of soft anions remains unclear. This analysis complements our recent work suggesting that the short-range solvation structure around these ions is scarcely different at the air/water interface from what it is in bulk water. Together, these observations suggest that changes in first-shell hydration structure around soft anions cannot explain observed surface activities.

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