Ronald Y. Dong

Southwest Minzu University

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E. Tomchuk

V. N. Karazin Kharkiv National University

E. Bock

University of Manitoba

E. Elliott Burnell

University of British Columbia

Carl A. Michal

University of British Columbia

G. M. Richards

Brandon University

Michael Giese

University of Duisburg-Essen

J. S. Lewis

University of Manitoba

Jiadi Xu

Kennedy Krieger Institute

Valentina Domenici

University of Pisa

Adrian C. J. Weber

University of British Columbia

Cooperative Institutions

Steklov Mathematical Institute

288

Centre National de la Recherche Scientifique

University of British Columbia

University of Manitoba

University of Oxford

Kent State University

University of Pisa

University of Duisburg-Essen

Brandon University

National Research Council Canada

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Director Fluctuations and Spin Relaxation

Partially ordered systems (1997)

Ronald Y. Dong

Larmor precession

10.1007/978-1-4612-1954-5_6

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Citations (0)

Interlayer Self-Diffusion and Structure of Chiral Smectic Phases Studied by ²H NMR Exchange Experiment

The Journal of Physical Chemistry B (2006)

Jiadi Xu Ronald Y. Dong

A deuterium two-dimensional exchange NMR technique is used to study the chiral smectic C (SmC*) and chiral subphases (Sm , Sm ) of a smectogen (s)-1-methylheptyl 4'-(4-n-decyloxy-benzoyloxy)biphenyl-4-carboxylate (10B1M7). The aim is to demonstrate how this technique can be combined with sample rotation in the magnetic field to obtain the fast translational self-diffusion constant along the helical pitch in the SmC* phase and to shed light on the structure of helicoidal superlattice in the three-layer Sm and four-layer Sm phases. The cross-peak intensities in the 2D exchange spectrum are sensitive to the disposition of molecules in the three- and four-layer base unit. The results support the "asymmetric Clock model" as an appropriate description of the ferrielectric phases in this compound.

Self-diffusion

10.1021/jp055868w

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Citations (14)

Deuterium NMR study of molecular order and conformation in the nematic phase of p-azoxyanisole

The Journal of Chemical Physics (1981)

Ronald Y. Dong J. S. Lewis E. Tomchuk Chas. G. Wade E. Bock

A single orientation order parameter tensor is shown to be sufficient for the entire molecule in the nematic phase of perdeuterated p-azoxyanisole by examining all the deuteron line splittings in the manner suggested by Bos and Doane. Two order parameters describing the molecular orientation order and the time averaged conformation of the molecule are measured. The relative conformation parameters are shown to be temperature independent within experimental error.

Deuterium NMR

Biaxial nematic

10.1063/1.440820

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Citations (14)

Proton spin-lattice relaxation in some amino acids in the solid phase

Journal of Magnetic Resonance (1969) (1971)

R.G.C. McElroy Ronald Y. Dong M. M. Pintar W. F. Forbes

Proton spin crisis

Lattice (music)

10.1016/0022-2364(71)90011-4

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Observation of an Anomalous Frequency Dependence of Proton Spin-Lattice Relaxation in Cysteine Hydrochloride Monohydrate

The Journal of Chemical Physics (1971)

Ronald Y. Dong M. M. Pintar W. F. Forbes

First Page

Lattice (music)

Proton spin crisis

Hydrochloride

10.1063/1.1675690

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Citations (4)

Proton Spin Relaxation Study of the Cholesteric-to-Nematic Phase Transition

The Journal of Chemical Physics (1971)

Ronald Y. Dong M. M. Pintar W. F. Forbes

The magnetic field in which a NMR experiment is performed can serve as the critical field for the cholesteric-to-nematic phase transition. The proton spin—lattice relaxation times, T1 and T1ρ, were measured in two cholesteric mixtures (p-azoxyanisole containing small amounts of cholesteryl chloride) to study the orientational order fluctuations in the cholesteric phase and at the thermally-induced cholesteric-to-nematic phase transition.

Proton NMR

10.1063/1.1676432

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Citations (10)

Structure and order of a homologous series of bent-core molecules: AC13NMRstudy

Physical Review E (2004)

Ronald Y. Dong Jiadi Xu Gyula Bényei Katalin Fodor‐Csorba

A carbon-13 NMR study in a series of bent-core (banana-shaped) molecules is reported. In 1, 3- phenylene bis[4'-alkenyloxy biphenyl]-4-carboxylate derivatives the position of the chlorine substituent(s) connected to the central phenyl ring and/or the terminal chain length of the compounds were varied. By analyzing the observed chemical shift anisotropies, the order parameters S and bending angles in their nematic phase are compared. The biphenyl moiety on each arm of the molecular core is found to form a nonzero twist angle.

Homologous series

Moiety

Center (category theory)

10.1103/physreve.70.011708

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Citations (17)

¹⁴N spin relaxation study in the hexagonal phase of a lyotropic liquid crystal

Molecular Physics (2001)

Ronald Y. Dong

14N quadrupolar splitting and spin-lattice relaxation times T IZ and T IQ were measured in the hexagonal phase of a binary mixture of dodecyltrimethylammonium chloride and water. The derived spectral densities of motion at seven temperatures together with their corresponding quadrupolar splittings were analysed based on a simple model of ‘classical’ aggregates. Both fast local motion and slower surface self-diffusion about the cylindrical aggregate axis were required to account for the 14N spin relaxation in this phase. The azimuthal correlation time was found to be tens of nanoseconds.

Lyotropic

Hexagonal phase

10.1080/002689700l0022896

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Citations (8)

Deuteron and proton NMR study of D2, p-dichlorobenzene and 1,3,5-trichlorobenzene in bimesogenic liquid crystals with two nematic phases

Chemical Physics Letters (2016)

E. Elliott Burnell Z. Ahmed Chris Welch Georg H. Mehl Ronald Y. Dong

Dichlorobenzene

Electric field gradient

Deuterium NMR

Quadrupole splitting

10.1016/j.cplett.2016.07.005

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Citations (8)

Two‐pulse frequency‐hopped excitation

Concepts in Magnetic Resonance Part A (2016)

Carl A. Michal Ronald Y. Dong

Abstract The use of frequency‐hopped pulse pairs and pulse pair trains for exciting NMR signals is introduced. Pairs of pulses, each pair lasting one nutation period about the effective field in the rotating frame, can be used to efficiently tip nuclear spin magnetization. In the limit where the frequency difference between the partners in a pair is large, the magnetization dynamics mimic those of an ordinary rectangular rf pulse with rf amplitude scaled down by a factor of π/2. When the amplitude of the applied rf begins to approach the offset frequency however, the excitation bandwidth broadens dramatically in a manner reminiscent of a composite pulse. The effects of the frequency‐hopped pulse pairs is described with analytical calculations and numerical simulations, and are shown to agree well with experiment.

Nutation

10.1002/cmr.a.21416

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Citations (3)