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Search Publications by: Madhusudan Tyagi (Assoc)

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Displaying 51 - 66 of 66

Space-Dependent Dynamics in 1,4-Polybutadiene Nanocomposite

August 16, 2013
Author(s)
J.H. Roh, Madhu Sudan Tyagi, T. E. Hogan, C. M. Roland
Neutron backscattering measurements were carried out on 1,4-polybutadiene, neat and bound to carbon nanoparticles. At large length scales (> 6Å), the Gaussian approximation holds: τ Β α ∝Q -2 where τ α is the segmental relaxation time, β the Kohlrausch

Microscopic Insights into Ion Gel Dynamics using Neutron Spectroscopy

August 1, 2012
Author(s)
Maiko Kofu, Takenori Someya, Soichi Tatsumi, Kazuhide Ueno, Takeshi Ueki, Masayoshi Watanabe, Takuro Matsunaga, Mitsuhiro Shibayama, Victoria Garcia Sakai, Madhu Sudan Tyagi, Osamu Yamamuro
We have investigated the microscopic dynamics of ion gels consisting of a PMMA [poly(methyl methacrylate)] network and EMITSFI [1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide] as the ionic liquid, by means of quasi-elastic neutron

Proton Hopping and Long-Range Transport in the Protic Liquid [Im][TFSI], Probed by Pulsed-Field Gradient NMR and Quasi-Elastic Neutron Scattering

July 1, 2012
Author(s)
Megan L. Hoarfrost, Madhu Sudan Tyagi, Rachel A. Segalman, Jeffrey A. Reimer
Protic ionic liquids are promising candidates for a wide variety of electrochemical applications owing to their high proton conductivity, good thermal and electrochemical stability, and negligible volatility. Proton hopping leads to enhanced conductivity

Inelastic Neutron Scattering on Polymer Electrolytes for Lithium-Ion Batteries

May 7, 2012
Author(s)
Huagen H. Peng, Madhu Sudan Tyagi, Kirt A. Page, Christopher Soles
The relationship between ion transport and polymer dynamics is central to the pursuit of solid polymer electrolytes for lithium batteries. This understanding is critical to achieve solid polymer electrolyte systems of sufficiently high ion conductivities

Hydrogen Species Motion in Piezoelectrics: A Quasi-Elastic Neutron Scattering Study

March 5, 2012
Author(s)
K. J. Alvine, Madhu Sudan Tyagi, Craig Brown, Terrence J. Udovic, T. Jenkins, S. G. Pitman
Hydrogen is known to damage or degrade piezoelectric materials, at low pressure for ferroelectric random access memory applications, and at high pressure for hydrogen powered vehicle applications. The piezoelectric degradation is in part governed by the

Hydration Water Freezing in Single Supported Lipid Bilayers

March 1, 2012
Author(s)
Laura Toppozini, Clare L. Armstrong, Martin D. Kaye, Madhu Sudan Tyagi, Timothy Jenkins, Maikel C. Rheinstadter
We present a high temperature and high energy resolution neturon scattering investigation of hydration water freezing in single supported lipid bilayers. Single supported lipid bilayers provide a well defined biological interface to study hydroation water

Dynamics of Hydration Water in Portland Cement with and without a Superplasticizer Studied by High-Resolution Quasi-Elastic Neutron Scattering

January 25, 2012
Author(s)
Hua Li, Emiliano Fratini, Francesca Ridi, Francesco Bausi, Piero Baglioni, Madhu Sudan Tyagi, Sow-Hsin Chen
The influence of a new comb-shaped polycarboxylate-based superplasticizer (CSSP) on the hydration kinetics and transport properties of aged cement pastes has been investigated by high-resolution Quasi-Elastic Neutron Scattering (QENS) and low temperature

Quasi-elastic Neutron Scattering Studies on Dynamics of Water Confined in Nanoporous Copper Rubeanate Hydrates

October 14, 2011
Author(s)
Takeshi Yamada, Ryo Yonaimine, Teppei Yamada, Hiroshi Kitagawa, Madhu Sudan Tyagi, Michihiro Nagao, Osamu Yamamuro
We have investigated the mechanism of the first order transition and proton conductivity in copper rubeanate hydrates from microscopic and dynamical points of view. Three different types of neutron spectrometer, time of flight, back scattering and neutron

The Dynamics of Unfolded Versus Folded tRNA: The Role of Electrostatic Interactions

September 21, 2011
Author(s)
Joon Ho Roh, Madhu Sudan Tyagi, Robert M. Briber, Sarah A. Woodson, Alexei P. Sokolov
We have used quasielastic neutron scattering spectroscopy to study the dynamics of unfolded tRNA under low ionic strength and tRNA folded through the addition of Mg 2+ in order to examine the role of electrostatic interactions in the dynamics of biological

Localized Diffusive Motion on Two Different Time Scales in Solid Alkane Nanoparticles

October 11, 2010
Author(s)
Siao-Kwan Wang, E. Mamontov, Mengjun Bai, F.Y. Hansen, Haskell Taub, John R. Copley, Victoria Garcia Sakai, Goran Gasparovic, Timothy Jenkins, Madhu Sudan Tyagi, Kenneth W. Herwig, David B. Neumann, Wouter Montfrooij, U.G. Volkmann
High-energy-resolution quasielastic neutron scattering on three complementary spectrometers has been used to investigate molecular diffusive motion in solid nanoparticles of the alkane n-C 32H^66^. Nontranslational molecular diffusive motion in the plastic

Diffusion in Single Solid Supported Lipid Bilayers Studied by Quasi-Elastic Neutron Scattering

October 1, 2010
Author(s)
Clare L. Armstrong, Martin D. Kaye, Michaela Zamponi, E. Mamontov, Madhu Sudan Tyagi, Timothy Jenkins, Maikel C. Rheinstadter
It seems to be increasingly accepted that the diversity and composition of lipids play an important role in the function of biological membranes. A prime example of this are lipid rafts; regions enriched with certain types of lipids which are speculated to