Dielectric relaxation of alkyl chains in graphite oxide and n-alkylammonium halides

Xiaoqian Ai; Yuchen Tian; Min Gu; Ji Yu; Tong B. Tang

doi:10.1063/1.4952402

Dielectric relaxation of alkyl chains in graphite oxide and n-alkylammonium halides

AIP Advances ◽

10.1063/1.4952402 ◽

2016 ◽

Vol 6 (5) ◽

pp. 055317 ◽

Cited By ~ 2

Author(s):

Xiaoqian Ai ◽

Yuchen Tian ◽

Min Gu ◽

Ji Yu ◽

Tong B. Tang

Keyword(s):

Dielectric Relaxation ◽

Graphite Oxide ◽

Alkyl Chains ◽

Alkylammonium Halides

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Anomalous dielectric relaxation of water confined in graphite oxide

Journal of Applied Physics ◽

10.1063/1.4931664 ◽

2015 ◽

Vol 118 (12) ◽

pp. 124104 ◽

Cited By ~ 5

Author(s):

Ji Yu ◽

Yuchen Tian ◽

Min Gu ◽

Tong B. Tang

Keyword(s):

Dielectric Relaxation ◽

Graphite Oxide

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Dielectric relaxation and hopping conduction in reduced graphite oxide

Journal of Applied Physics ◽

10.1063/1.4953357 ◽

2016 ◽

Vol 119 (22) ◽

pp. 224102 ◽

Cited By ~ 3

Author(s):

Guidan Wei ◽

Ji Yu ◽

Min Gu ◽

Tong B. Tang

Keyword(s):

Dielectric Relaxation ◽

Graphite Oxide ◽

Hopping Conduction ◽

Reduced Graphite Oxide

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Proton conductance and dielectric relaxation in hydrated graphite oxide, studied with impedance spectroscopy

Applied Physics Letters ◽

10.1063/1.5023187 ◽

2018 ◽

Vol 112 (17) ◽

pp. 171603 ◽

Cited By ~ 3

Author(s):

Ji Yu ◽

Yadong Lian ◽

Wei Xu ◽

Chenglong Wang ◽

Xueling Chang ◽

...

Keyword(s):

Impedance Spectroscopy ◽

Dielectric Relaxation ◽

Graphite Oxide ◽

Proton Conductance

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Dielectric relaxation processes of some dialkyl disulfides

Canadian Journal of Chemistry ◽

10.1139/v83-366 ◽

1983 ◽

Vol 61 (9) ◽

pp. 2107-2111 ◽

Cited By ~ 2

Author(s):

H. A. Khwaja ◽

S. Walker

Keyword(s):

Dielectric Relaxation ◽

Relaxation Processes ◽

Alkyl Chains ◽

Polystyrene Matrix ◽

Segmental Relaxation ◽

Higher Temperature ◽

Dialkyl Disulfides ◽

Intramolecular Rotation ◽

Two Temperature ◽

Low Temperature Process

Dielectric relaxation studies have been performed for dimethyl, diethyl, di-isopropyl, di-n-butyl, di-tert-butyl, and di-n-octyl disulfides in a polystyrene matrix. For the last five compounds the absorption appears in two temperature regions. The relaxation data for the higher temperature regions are consistent with intramolecular rotation around the S—S bond with accompanying flexibility in the alkyl chains. The enthalpy barrier to this relaxation process is ~29 kJ mol−1 and is the trans (lower) barrier. This value is typical for all six dialkyl disulfides. The most likely interpretation of the low temperature process is that there is segmental relaxation of the alkyl chains which also involves movement of the main dipoles (S—S and S—C).

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Hygroscopic Growth of Self-Assembled Layered Surfactant Molecules at the Interface between Air and Organic salts

MRS Proceedings ◽

10.1557/proc-775-p6.14 ◽

2003 ◽

Vol 775 ◽

Author(s):

Yongsoon Shin ◽

Li-Qiong Wang ◽

Glen E. Fryxell ◽

Greg J. Exarhos

Keyword(s):

Self Assembly ◽

Tetrabutylammonium Bromide ◽

Hygroscopic Growth ◽

X Ray Diffraction ◽

Organic Salts ◽

Alkyl Chains ◽

Lamellar Phases ◽

Tetrabutylammonium Nitrate ◽

Diffraction Patterns ◽

Alkylammonium Halides

AbstractIn this paper, we report a self-assembly of surfactant molecules at the interface of air/hygroscopic quaternary ammonium salts such as tetrabutylammonium acetate (TBAAc), tetrabutylammonium bromide (TBAB), and tetrabutylammonium nitrate (TBAN), where they show different hygroscopicity, TBAAc > TBAB > TBAN. Homogeneously dissolved surfactants rearrange themselves when they contact air due to high moisture adsorption behavior of such organic salts. Highly ordered lamellar phases with different lattice spacings have been observed when surfactants with long alkyl chains were used. Alkylammonium halides form monolayers, while neutral alkylamines forms bilayers based upon basal spacings of their X-ray diffraction patterns. The change in basal spacings in lamellar patterns, the alkyl chain conformation of surfactants, and Hbonding property of neutral amine surfactants are discussed in detail.

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