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Search Publications by: Madhusudan Tyagi (Assoc)

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Displaying 26 - 50 of 66

Dynamic Odd-Even Effect in Liquid n-Alkanes Near Their Melting Points

November 1, 2016
Author(s)
Ke Yang, Zhikun Cai, Abhishek Jaiswal, Madhu Sudan Tyagi, Jeffrey S. Moore, Yang Zhang
n-Alkanes are the textbook examples of the odd-even effect. The difference in the packing pattern of odd- and even-numbered n-alkanes results in the odd-even variation of their melting points. In the liquid state, where the packing effects do not hold, it

Hydrogen Diffusion in Bulk and Nanocrystalline Palladium: A Quasielastic Neutron Scattering Study

August 29, 2016
Author(s)
Maiko Kofu, Naoki Hashimoto, Hiroshi Akiba, Hirokazu Kobayashi, Hiroshi Kitagawa, Hiroshi Kitagawa, Madhu Sudan Tyagi, Antonio Faraone, John R. Copley, Wiebke Lohstroh, Osamu Yamamuro
The diffusion dynamics of hydrogen in bulk and Nanocrystalline palladium has been examined using quasielastic neutron scattering (QENS). With respect to bulk PdH 0.73, two relaxation processes were found. For both processes, the variation of the relaxation

Quasi-Elastic Neutron Scattering Studies of Hydrogen Dynamics for Nanoconfined NaAlH 4

July 14, 2016
Author(s)
Shathabish NaraseGowda, Craig Brown, Madhu Sudan Tyagi, Tabbetha A. Dobbins
The hydrogen dynamics of nano-confined sodium alanate (NaAlH 4) has been studied using quasi-elastic neutron scattering (QENS). Results indicate thermodynamic destabilization is responsible for reduced desorption temperatures of NaAlH 4 upon confinement

Neutron Scattering Studies of Lithium-Ion Diffusion in Ternary Phosphate Glasses

June 30, 2016
Author(s)
Gavin Hester, Tom Heitmann, Madhu Sudan Tyagi, Munesh Rathore, Anshuman Dalvi, Saibal Mitra
We have studied the diffusion mechanism of lithium ions in glassy oxide-based solid sate electrolytes using elastic and electrolytes using elastic and quasielastic neutron scattering. Samples of xLi 2SO 4-(1-x)(Lid2^O-P 2O 5) were prepared using

Supramolecular Hydrophobic Aggregates in Hydrogels Partially Inhibit Ice Formation

June 23, 2016
Author(s)
Clinton G. Wiener, Madhu Sudan Tyagi, Yun Liu, R. A. Weiss, Bryan D. Vogt
Prevention of ice crystallization is a challenging problem with implications in diverse applications, including the ability to examine the fundamental low temperature physics of water. Here, we demonstrate a simple route, inspired by water confinement in

Odd-Even Structural Sensitivity on Dynamics in Network-Forming Ionic Liquids

February 10, 2016
Author(s)
Ke Yang, Zhikun Cai, Madhu Sudan Tyagi, Mikhail Feygenson, Joerg Neuefeind, Jeffrey S. Moore, Yang Zhang
As a compelling case of sensitive-property relationship, an odd-even effect refers to the alternating trend of physical or chemical properties on odd/even number of repeating structural units. In crystalline or semi-crystalline materials, such odd-even

Rotational Dynamics of Organic Cations in the CH 3 NH 3 Pbl 3 Perovskite

December 14, 2015
Author(s)
Tianran Chen, Benjamin J. Foley, Bahar NMN Ipek, Madhu Sudan Tyagi, John R. Copley, Craig Brown, Joshua J. Choi, Seunghun Lee Lee
All semiconductors can generate free charges by absorbing light. However, not all semiconductors are high performance photovoltaic materials, because the charge carriers with opposite signs, electrons and holes, quickly annihilate each other. High

Charge Screening in RNA: An Integral Route for Dynamical Enhancements

December 7, 2015
Author(s)
Joon Ho Roh, Madhu Sudan Tyagi, Pulakesh Aich, R. M. Briber, Sarah A. Woodson, Kimoon Kim
Electrostatic interactions of RNA are in the center of determining the dynamical flexibility and structural stability. By Analysing neutron scattering spectroscopy, we show that fast dynamics of hydrated tRNA on ps to ns timescales increases with stronger

Effects of Pressure on the Dynamics of an Oligomeric Protein from Deep-Sea Hyperthermophile

November 10, 2015
Author(s)
Utsab R. Shrestha, Debsindhu Bhowmik, John R. Copley, Madhu Sudan Tyagi, Juscelino Leao, Xiang-Qiang Chu
Inorganic Pyrophosphatase (IPPase) from Thermococcus thioreducens is a large oligomeric protein derived from a hyperthermophilic microorganism that is found near hydrothermal vents deep under the sea, where the pressure is up to 100 MPa (1 kbar). It has

Understanding the Decreased Segmental Dynamics of Supported Thin Polymer Films Reported by Incoherent Neutron Scattering

February 10, 2015
Author(s)
Changhuai Ye, Clinton G. Wiener, Madhu Sudan Tyagi, David Uhrig, Sara Orski, Christopher Soles, Bryan D. Vogt, David S. Simmons
Incoherent neutron scattering (INS) has commonly reported a suppression of segmental dynamics for supported thin polymer films as thickness is decreased, which is counter to expectations based on other measurement techniques such as ellipsometry and

Quasielastic Neutron Scattering Study of POSS Ligand Dynamics

January 23, 2015
Author(s)
Niina Jalarvo, Madhu Sudan Tyagi, Michael K. Crawford
Polyoligosilsesquioxanes are molecules having cage-like structures composed of silicon and oxygen. These molecules can have a wide variety of functional ligands attached to them. Depending on the nature of the ligand, interesting properties and application

Kinetic Polymer Arrest in Percolated SWNT Networks

December 3, 2014
Author(s)
Rana NMN Ashkar, Mansour Abdul Baki, Madhu Sudan Tyagi, Antonio Faraone, Paul Butler, Ramanan Krishnamoorti
The inclusion of single-wall carbon nanotubes (SWNT) in a polymer, with interchain distances comparable to the SWNT diameter, can significantly perturb the structural and dynamical properties of interfacial polymeric units. For SWNT concentrations above

Proton Dynamics of Two-Dimensional Oxalate-Bridged Coordination Polymers

August 28, 2014
Author(s)
Satoshi Miyatsu, Maiko Kofu, Atsushi Nagoe, Takeshi Yamada, Masaaki Sadakiyo, Teppei Yamada, Hiroshi Kitagawa, Madhu Sudan Tyagi, Victoria Garcia Sakai, Osamu Yamamuro
A two-dimensional porous coordination polymer (NH 4) 2HOOC(CH 2) 4COOH}[ZN 2(Co 2O 4) 3] (abbreviated to ZnADP), which accommodates water molecules between the [Zn 2(C 2O 4) 3] layers, is highly remarked as a new-type crystalline proton conductor. In order

On the Freezing Behavior and Diffusion of Water in Proximity to Single-supported Zwitterionic and Anionic Bilayer Lipid Membranes

July 22, 2014
Author(s)
A. Miskowiec, Z. N. Buck, M. C. Brown, H. Kaiser, F.Y. Hansen, G. M. King, H. Taub, R. Jiji, J.W. Cooley, Madhu Sudan Tyagi, S. O. Diallo, E. Mamontov, K. W. Herwig
We compare the freezing/melting behavior of water hydrating single-supported bilayers of a zwitterionic lipid DMPC with that of an anionic lipid DMPG. For both membranes, the temperature dependence of the elastically scattered neutron intensity indicates

Direct Measurement of Hydrogen Dislocation Pipe Diffusion in Deformed Polycrystalline Pd using Quasielastic Neutron Scattering

July 10, 2014
Author(s)
Brent J. Heuser, Dallas R. Trinkle, Niina Jalarvo, Joseph Serio, Eugene Mamontov, Madhu Sudan Tyagi
The temperature-dependent diffusivity D(T) of hydorgen solute atoms trapped at dislocations - dislocation pipe diffusion of hydorgen - in deformed polycrystalline PdH x(x'0 -3[H]/[Pd] has been quantified with quasi-elastic neutron scattering (QENS) between

Interrelationship between Number of Mobile Protons, Diffusion Coefficient, and AC Conductivity in Superprotonic Conductors, CsHSO 4 and Rb 3 H(SeO 4 ) 2

June 25, 2014
Author(s)
Kazuya Kamazawa, Masashi Harada, Toru Araki, Yasumitsu Matsuo, Madhu Sudan Tyagi, Jun Sugiyama
Using quasielastic neutron scattering (QENS), we investigated proton dynamics for two superprotonic conductors, CsHSO 4 and Rb 2H(SeO 4) 2. In the superprotonic conducting phase, two translational proton motions were observed for the both compounds. Making

Incoherent Quasielastic Neutron Scattering Study of the Relaxation Dynamics in Molybdenum-Oxide Based Keplerate Type Nanocages

June 19, 2014
Author(s)
Antonio Faraone, Emiliano Fratini, Somenath Garai, Achim Muller, Madhu Sudan Tyagi, Timothy Jenkins, Eugene Mamontov, Rick L. Paul, John R. Copley, Piero Baglioni
The single particle relaxation dynamics of hydrogen atoms in different oxomolybdate Keplerate type nanocages characterized by a (metal) 30 icosidodecahedron and a size of {approximately equal}25 A were studied using Incoherent Quasielastic Neutron

Boson Peak in Deeply Cooled Confined Water: A Possible Way to Explore the Existence of the Liquid-to-Liquid Transition in Water

June 13, 2014
Author(s)
Zhe Wang, Kao-Hsiang Liu, Peisi Le, Mingda Li, Wei-Shan Chiang, Juscelino Leao, John R. Copley, Madhu Sudan Tyagi, Andrey Podlesnyak, Alexander I. Kolesnikov, Chung-Yuan Mou, Sow-Hsin Chen
The Boson peak in deeply-cooled water confined in nanopores is studied with inelastic neutron scattering. We show that the emergence of the Boson peak is correlated to the Widom line below 1600 bar. Above 1600 bar, the situation is different and from this

Effect of Binding to Carbon Black on the Dynamics of 1,4-Polybutadiene

October 7, 2013
Author(s)
J.H. Roh, Madhu Sudan Tyagi, T. E. Hogan, C. M. Roland
The nature of the interactions of polymers at the surface of nanoparticles is crucial to understanding the dynamics and their effect on the mechanical properties. The effect of binding (both chemical attachment and physical adsorption) on the local and