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

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.

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

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

A study of oxygen and vacancy ordering in YBa2Cu3O7−x

1989 ◽  
Vol 47 ◽  
pp. 164-165
Author(s):  
Y. P. Lin ◽  
A. H. O’Reilly ◽  
J. E. Greedan ◽  
M. Post
Keyword(s):  
Electron Microscopy ◽  
Neutron Diffraction ◽  
Oxygen Content ◽  
Carbon Film ◽  
Nitrogen Atmosphere ◽  
Vacancy Ordering ◽  
Powder Samples ◽  
Vacancy Chains ◽  
Chain Ordering

In the basal planes of the orthorhombic YBa2Cu3O7-X compound with x=0.07, which has a Tc of around 90K, chains of copper-oxygen are formed along the [010] direction. Previous investigations on the variation of Tc with oxygen content have shown the existence of a plateau at Tc = 60K for x=0.3 to 0.4, suggesting the presence of a separate phase. This phase has also been identified to be orthorhombic, but with a 2x superlattice along [100] of the parent structure, and the superlattice has been attributed to the formation of alternating copper-oxygen and copper-vacancy chains. In our work, we have studied the chain ordering phenomenon by electron microscopy and neutron diffraction on samples with different oxygen contents. We report here some of our electron microscopy findings for samples with x=0.4.Powder samples of YBa2Cu3O7-X were prepared by controlled re-oxidation of previously reduced material. For electron microscopy, the sample was dry ground using a mortar and pestle in a dry nitrogen atmosphere without the use of any solvent and transferred dry onto holey carbon film for examination in a Philips CM12 microscope.

Template mediated crystal engineering

1994 ◽  
Vol 52 ◽  
pp. 480-481
Author(s):  
Brigid R. Heywood ◽  
S. Champ
Keyword(s):  
Crystal Engineering ◽  
Electrostatic Interactions ◽  
Alkyl Chain ◽  
Crystallographic Axis ◽  
Two Dimensional ◽  
Engineering Process ◽  
Solution Interface ◽  
Extensive Program ◽  
Geometric Homology ◽  
Long Alkyl Chain

Recent work on the crystallisation of inorganic crystals under compressed monomolecular surfactant films has shown that two dimensional templates can be used to promote the oriented nucleation of solids. When a suitable long alkyl chain surfactant is cast on the crystallisation media a monodispersied population of crystals forms exclusively at the monolayer/solution interface. Each crystal is aligned with a specific crystallographic axis perpendicular to the plane of the monolayer suggesting that nucleation is facilitated by recognition events between the nascent inorganic solid and the organic template.For example, monolayers of the long alkyl chain surfactant, stearic acid will promote the oriented nucleation of the calcium carbonate polymorph, calcite, on the (100) face, whereas compressed monolayers of n-eicosyl sulphate will induce calcite nucleation on the (001) face, (Figure 1 & 2). An extensive program of research has confirmed the general principle that molecular recognition events at the interface (including electrostatic interactions, geometric homology, stereochemical complementarity) can be used to promote the crystal engineering process.

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