scholarly journals Charge regulation and local dielectric function in planar polyelectrolyte brushes

2012 ◽  
Vol 136 (23) ◽  
pp. 234901 ◽  
Author(s):  
Rajeev Kumar ◽  
Bobby G. Sumpter ◽  
S. Michael Kilbey
Keyword(s):  
Dielectric Function ◽  
Charge Regulation ◽  
Polyelectrolyte Brushes

Charge regulation in polyelectrolyte brushes studied by FTIR spectroscopy

2000 ◽  
Vol 169 (1-3) ◽  
pp. 351-356 ◽  
Author(s):  
Takashi Abe ◽  
Shujiro Hayashi ◽  
Nobuyuki Higashi ◽  
Masazo Niwa ◽  
Kazue Kurihara
Keyword(s):  
Ftir Spectroscopy ◽  
Charge Regulation ◽  
Polyelectrolyte Brushes

Field Theoretical Analysis of Driving Forces for the Uptake of Proteins by Like-Charged Polyelectrolyte Brushes: Effects of Charge Regulation and Patchiness

Langmuir ◽  
2010 ◽  
Vol 26 (1) ◽  
pp. 249-259 ◽  
Author(s):  
Wiebe M. de Vos ◽  
Frans A. M. Leermakers ◽  
Arie de Keizer ◽  
Martien A. Cohen Stuart ◽  
J. Mieke Kleijn
Keyword(s):  
Theoretical Analysis ◽  
Driving Forces ◽  
Charge Regulation ◽  
Polyelectrolyte Brushes

Optical properties of the Vanadium dioxide

2015 ◽  
Vol 8 (2) ◽  
pp. 2148-2155 ◽  
Author(s):  
Abderrahim Benchaib ◽  
Abdesselam Mdaa ◽  
Izeddine Zorkani ◽  
Anouar Jorio
Keyword(s):  
Energy Efficiency ◽  
Optical Properties ◽  
Critical Temperature ◽  
Thin Layer ◽  
Dielectric Function ◽  
Vanadium Dioxide ◽  
Ultra Violet ◽  
Index Of Refraction ◽  
Practical Utility ◽  
Infra Red

The vanadium dioxide is a material thermo chromium which sees its optical properties changing at the time of the transition from the phase of semiconductor state ↔ metal, at a critical temperature of 68°C. The study of the optical properties of a thin layer of VO₂ thickness 82 nm, such as the dielectric function, the index of refraction, the coefficient ofextinction, the absorption’s coefficient, the reflectivity, the transmittivity, in the photonic spectrum of energy ω located inthe interval: 0.001242 ≤ ω (ev) ≤ 6, enables us to control well its practical utility in various applications, like the intelligentpanes, the photovoltaic, paintings for increasing energy efficiency in buildings, detectors of infra-red (I.R) or ultra-violet(U.V). We will make simulations with Maple and compare our results with those of the literature

From Semiconductor to Metal in a Flash: Observing Ultrafast Laser-Induced Phase Transformations

1997 ◽  
Vol 481 ◽  
Author(s):  
J. P. Callan ◽  
A. M.-T. Kim ◽  
L. Huangt ◽  
E. N. Glezer ◽  
E. Mazur
Keyword(s):  
Phase Transformations ◽  
Dielectric Function ◽  
Spectral Range ◽  
Laser Excitation ◽  
Spectroscopic Technique ◽  
Ultrafast Laser ◽  
Lattice Heating ◽  
Fs Laser

ABSTRACTWe use a new broadband spectroscopic technique to measure ultrafast changes in the dielectric function of a material over the spectral range 1.5–3.5 eV following intense 70-fs laser excitation. The results reveal the nature of the phase transformations which occur in the material following excitation. We studied the response of GaAs and Si. For GaAs, there are three distinct regimes of behavior as the pump fluence is increased — lattice heating, lattice disordering, and a semiconductor-to-metal transition.

scholarly journals Interlayer dielectric function of a type-II van der Waals semiconductor: The HfS2/PtS2 heterobilayer

2019 ◽  
Vol 3 (12) ◽  
Author(s):  
Stefana Anais Colibaba ◽  
Sabine Körbel ◽  
Carlo Motta ◽  
Fedwa El-Mellouhi ◽  
Stefano Sanvito
Keyword(s):  
Dielectric Function ◽  
Van Der Waals ◽  
Type Ii ◽  
Interlayer Dielectric

scholarly journals Charge Regulation at a Nanoporous Two-Dimensional Interface

ACS Omega ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 2487-2493
Author(s):  
Mandakranta Ghosh ◽  
Moritz A. Junker ◽  
Robert T. M. van Lent ◽  
Lukas Madauß ◽  
Marika Schleberger ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Charge Regulation

scholarly journals Effects of Amino Acid Side-Chain Length and Chemical Structure on Anionic Polyglutamic and Polyaspartic Acid Cellulose-Based Polyelectrolyte Brushes

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1789
Author(s):  
Dmitry Tolmachev ◽  
George Mamistvalov ◽  
Natalia Lukasheva ◽  
Sergey Larin ◽  
Mikko Karttunen
Keyword(s):  
Glutamic Acid ◽  
Chain Length ◽  
Chemical Structure ◽  
Side Chain ◽  
Side Chains ◽  
Side Chain Length ◽  
Polyelectrolyte Brushes ◽  
Grafting Density ◽  
The Difference ◽  
Cellulose Surface

We used atomistic molecular dynamics (MD) simulations to study polyelectrolyte brushes based on anionic α,L-glutamic acid and α,L-aspartic acid grafted on cellulose in the presence of divalent CaCl2 salt at different concentrations. The motivation is to search for ways to control properties such as sorption capacity and the structural response of the brush to multivalent salts. For this detailed understanding of the role of side-chain length, the chemical structure and their interplay are required. It was found that in the case of glutamic acid oligomers, the longer side chains facilitate attractive interactions with the cellulose surface, which forces the grafted chains to lie down on the surface. The additional methylene group in the side chain enables side-chain rotation, enhancing this effect. On the other hand, the shorter and more restricted side chains of aspartic acid oligomers prevent attractive interactions to a large degree and push the grafted chains away from the surface. The difference in side-chain length also leads to differences in other properties of the brush in divalent salt solutions. At a low grafting density, the longer side chains of glutamic acid allow the adsorbed cations to be spatially distributed inside the brush resulting in a charge inversion. With an increase in grafting density, the difference in the total charge of the aspartic and glutamine brushes disappears, but new structural features appear. The longer sides allow for ion bridging between the grafted chains and the cellulose surface without a significant change in main-chain conformation. This leads to the brush structure being less sensitive to changes in salt concentration.

Low-Concentration Salt Solution Changes the Interfacial Molecular Behavior of Polyelectrolyte Brushes

2021 ◽  
Author(s):  
Yongsheng Luo ◽  
Chu Wang ◽  
Ai-Ping Pang ◽  
Xiang Zhang ◽  
Dayang Wang ◽  
...  
Keyword(s):  
Salt Solution ◽  
Low Concentration ◽  
Polyelectrolyte Brushes ◽  
Molecular Behavior ◽  
Solution Changes

scholarly journals Charge Regulation during Amyloid Formation of α-Synuclein

2021 ◽  
Author(s):  
Tinna Pálmadóttir ◽  
Anders Malmendal ◽  
Thom Leiding ◽  
Mikael Lund ◽  
Sara Linse
Keyword(s):  
Amyloid Formation ◽  
Charge Regulation
Sign in / Sign up

Export Citation Format

Share Document