Alkyl Chain Ordering of Asymmetric Phosphatidylcholines Adsorbed at a Liquid−Liquid Interface

1999 ◽  
Vol 103 (4) ◽  
pp. 653-659 ◽  
Author(s):  
B. L. Smiley ◽  
G. L. Richmond
Keyword(s):  
Alkyl Chain ◽  
Liquid Interface ◽  
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

Bicomponent blend-directed amplification of the alkyl chain effect on the 2D structures

2014 ◽  
Vol 50 (86) ◽  
pp. 13146-13149 ◽  
Author(s):  
Yoshihiro Kikkawa ◽  
Manami Ishitsuka ◽  
Ayumi Kashiwada ◽  
Seiji Tsuzuki ◽  
Kazuhisa Hiratani
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Alkyl Chain ◽  
Liquid Interface ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Solid Liquid Interface ◽  
Solid Liquid

The 2D structures of bicomponent blends in isobutenyl compounds were observed by using scanning tunneling microscopy at the solid/liquid interface. Amplification of the alkyl chain effect was found on the 2D structures.

LIQUID–LIQUID INTERFACE STUDY OF HYDROCARBONS, ALCOHOLS, AND CATIONIC SURFACTANTS WITH WATER

2009 ◽  
Vol 16 (04) ◽  
pp. 599-608 ◽  
Author(s):  
MAN SINGH ◽  
HIDEKI MATSUOKA
Keyword(s):  
Cationic Surfactants ◽  
Nonionic Surfactants ◽  
Alkyl Chain ◽  
Hydrophobic Interactions ◽  
Liquid Interface ◽  
Saturated Hydrocarbons ◽  
Inductive Effects ◽  
Interface Study ◽  
Similar Decrease ◽  
Sigma Bond

Molecular interaction dynamics at liquid–liquid interface (LLI), involved nondispersive solution as compared with the interaction in bulk phase. Thereby, interfacial tension (IFT, mN/m) of LLI for four saturated hydrocarbons, six alcohols, and three cationic surfactants are reported at 298.15 K. The pentane, hexane, heptane, octane hydrocarbons and pentanol, hexanol, heptanol, 1-octanol, 2-octanol, and 1-decanol alcohols were used and IFT data were compared with 4 mm kg-1 dodecyltrimethylammoniumbromide (DTAB), trimethylsulfoxoniumiodide (TMSOI), methyltrioctylammoniumchloride (MTOAC) surfactants studied in benzene–water LLI. The IFT data are noted as hydrocarbons > DTAB > TMSOI > alcohols > MTOAC. The hydrocarbons and alcohols decreased IFT within 16 to 49% and 87 to 92%, respectively, whereas the surfactants within 78.3 to 95.9%. The alcohols developed interaction similar to surfactants and are denoted as nonionic surfactants for making mixtures of low IFT with hydrophilic and hydrophobic interactions to the level of the surfactants. The pentanol and MTOAC caused similar decrease in IFT so the pentanol developed the hydrophilic and hydrophobic interactions of the strength of MTOAC. Comparatively, the hydrocarbons showed lower decrease but the octane showed 49% decrease in IFT. Thus, the hydrocarbon with longer alkyl chain and the alcohol with shorter behave as good surfactants. The hydrocarbons with inductive effect on sigma bond between carbon atoms in alkyl chain also weakened the IFT and influenced the hydrophobic interactions. The MTOAC with four octyl units reduced 96% IFT so inductive effects monitor LLI dynamics.

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

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

Orientational ordering of alkyl chain at the air/liquid interface of ionic liquids studied by sum frequency vibrational spectroscopy

2004 ◽  
Vol 389 (4-6) ◽  
pp. 321-326 ◽  
Author(s):  
Toshifumi Iimori ◽  
Takashi Iwahashi ◽  
Hisao Ishii ◽  
Kazuhiko Seki ◽  
Yukio Ouchi ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Vibrational Spectroscopy ◽  
Alkyl Chain ◽  
Liquid Interface ◽  
Sum Frequency ◽  
Orientational Ordering ◽  
Air Liquid Interface
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