Directing Alkyl Chain Ordering of Functional Phosphorus Coupling Agents on ZrO2

Langmuir ◽  
2011 ◽  
Vol 27 (7) ◽  
pp. 3534-3540 ◽  
Author(s):  
Christoph J. Lomoschitz ◽  
Bernhard Feichtenschlager ◽  
Norbert Moszner ◽  
Michael Puchberger ◽  
Klaus Müller ◽  
...  
Keyword(s):  
Alkyl Chain ◽  
Coupling Agents ◽  
Chain Ordering

scholarly journals Layered‐Herringbone Polymorphs and Alkyl‐Chain Ordering in Molecular Bilayer Organic Semiconductors

2019 ◽  
Vol 30 (4) ◽  
pp. 1906406 ◽  
Author(s):  
Shunto Arai ◽  
Kaede Morita ◽  
Jun'ya Tsutsumi ◽  
Satoru Inoue ◽  
Mutsuo Tanaka ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Alkyl Chain ◽  
Chain Ordering

scholarly journals Effects of Cholesterol on Water Permittivity of Biomimetic Ion Pair Amphiphile Bilayers: Interplay between Membrane Bending and Molecular Packing

2019 ◽  
Vol 20 (13) ◽  
pp. 3252
Author(s):  
Wu-jhao Tien ◽  
Kun-you Chen ◽  
Fong-yin Huang ◽  
Chi-cheng Chiu
Keyword(s):  
Alkyl Chain ◽  
Synergistic Effects ◽  
Deformation Energy ◽  
Ion Pair ◽  
Molecular Packing ◽  
Energy Penalty ◽  
Membrane Bending ◽  
Dynamics Simulations ◽  
Chain Ordering ◽  
Ion Pair Amphiphile

Ion pair amphiphile (IPA), a molecular complex composed of a pair of cationic and anionic amphiphiles, is an inexpensive phospholipid substitute to fabricate vesicles with various pharmaceutical applications. Modulating the physicochemical and permeation properties of IPA vesicles are important for carrier designs. Here, we applied molecular dynamics simulations to examine the cholesterol effects on the structures, mechanics, and water permittivity of hexadecyltrimethylammonium-dodecylsulfate (HTMA-DS) and dodecyltrimethylammonium- hexadecylsulfate (DTMA-HS) IPA bilayers. Structural and mechanical analyses indicate that both IPA systems are in gel phase at 298 K. Adding cholesterol induces alkyl chain ordering around the rigid sterol ring and increases the cavity density within the hydrophilic region of both IPA bilayers. Furthermore, the enhanced alkyl chain ordering and the membrane deformation energy induced by cholesterol increase the permeation free energy penalty. In contrast, cholesterol has minor effects on the water local diffusivities within IPA membranes. Overall, the cholesterol reduces the water permittivity of rigid IPA membranes due to the synergistic effects of increased alkyl chain ordering and enhanced membrane mechanical modulus. The results provide molecular insights into the effects of molecular packing and mechanical deformations on the water permittivity of biomimetic IPA membranes, which is critical for designing IPA vesicular carriers.

scholarly journals Solvent-Free Synthesis of Amidated Carboxymethyl Cellulose Derivatives: Effect on the Thermal Properties

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1227 ◽  
Author(s):  
Asja Pettignano ◽  
Aurélia Charlot ◽  
Etienne Fleury
Keyword(s):  
Thermal Properties ◽  
Carboxymethyl Cellulose ◽  
Chemical Structure ◽  
Alkyl Chain ◽  
Coupling Agents ◽  
Cellulose Ether ◽  
Cellulose Derivatives ◽  
Alkyl Amines ◽  
Solvent Free Synthesis ◽  
Aliphatic Spacer

The present work explores the possibility of chemically modifying carboxymethyl cellulose (CMC), a widely diffused commercial cellulose ether, by grafting of hydrophobic moieties. Amidation of CMC, at high temperature and in heterogeneous conditions, was selected as synthetic tool for grafting on CMC a panel of commercially available amines (bearing long aliphatic chains, alkyl aromatic and heteroaromatic groups, more or less spaced from the cellulose backbone). The reaction was successfully carried out in absence of solvents, catalysts and coupling agents, providing a promising and more sustainable alternative to conventional amidation procedures. Relationships between the chemical structure of the obtained CMC derivatives and their thermal properties were carefully studied, with a particular attention to the thermal behavior. Grafting of aromatic and heteroaromatic alkyl amines, presenting a linear alkyl chain between CMC backbone and a terminal bulky moiety, allowed for efficiently separating the polysaccharide chains, improving their mobility and resulting in a consequent lowering of the glass transition temperature (Tg). The Tg values obtained (90–147 °C) were found to be closely dependent on both the size of the aliphatic spacer, the structure of the aromatic ring and the extent of amidation.

Spectroscopic Metrics for Alkyl Chain Ordering in Lying-Down Noncovalent Monolayers of Diynoic Acids on Graphene

2018 ◽  
Vol 30 (8) ◽  
pp. 2506-2514 ◽  
Author(s):  
Shane R. Russell ◽  
Tyson C. Davis ◽  
Jae Jin Bang ◽  
Shelley A. Claridge
Keyword(s):  
Alkyl Chain ◽  
Chain Ordering ◽  
Lying Down

Interplay between H-Bonding and Alkyl-Chain Ordering in Self-Assembly of Monodendritic L-Alanine Derivatives

ChemPhysChem ◽  
2012 ◽  
Vol 13 (6) ◽  
pp. 1470-1478 ◽  
Author(s):  
Denis V. Anokhin ◽  
Jānis Lejnieks ◽  
Ahmed Mourran ◽  
Xiaomin Zhu ◽  
Helmut Keul ◽  
...  
Keyword(s):  
Self Assembly ◽  
Alkyl Chain ◽  
Chain Ordering

Oblate hexaalkoxytriphenylene solutes in a prolate nematic solvent: a deuterium NMR study of alkyl chain ordering

1993 ◽  
Vol 115 (23) ◽  
pp. 10895-10900 ◽  
Author(s):  
D. J. Photinos ◽  
Z. Luz ◽  
H. Zimmermann ◽  
E. T. Samulski
Keyword(s):  
Alkyl Chain ◽  
Deuterium Nmr ◽  
Nmr Study ◽  
Nematic Solvent ◽  
Chain Ordering
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