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Neutron research

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Displaying 751 - 775 of 1582

Natural Alteration of 6Li Neutron Shielding Glass

September 21, 2018
Author(s)
Jamie L. Weaver, Danyal J. Turkoglu
Li-6 alumino-silicate glass, a neutron shielding material, has been studied to determine if and to what extent it alters under natural conditions. Analyses included neutron depth profiling, prompt gamma activation analysis, x-ray diffraction, and scanning

Spin Waves in Detwinned BaFe 2 As 2

August 8, 2018
Author(s)
Xingye Lu, Daniel D. Scherer, David W. Tam, Wenliang Zhang, Rui Zhang, Huiqian Luo, Leland Harriger, H. C. Walker, D.T. Adroja, Brian M. Andersen, Pengcheng Dai

Highly Contrasting Static Charging and Bias Stress Effects in Pentacene Transistors with Polystyrene Heterostructures Incorporating Oxidizable N,N'-Bis(4-Methoxyphenyl)aniline Side Chains as Gate Dielectrics

August 1, 2018
Author(s)
Qingyang Zhang, Tejaswini S. Kale, Evan Plunkett, Wei Shi, Brian Kirby, Daniel H. Reich, Howard E. Katz
Charge trapping and storage in polymer dielectrics can be harnessed for the control of semiconductor device behavior, including organic transistors. For example, gate insulators chosen for organic transistors have an important effect on both bias stress

Aggregation and Solubility of a Model Conjugated Donor-Acceptor Polymer

July 31, 2018
Author(s)
Daniel R. Reid, Nicholas E. Jackson, Alexander J. Bourque, Chad R. Snyder, Ronald L. Jones, Juan de Pablo
In organic semiconductors, solution-phase polymer structure and aggregation have a strong influence on device morphology and performance. Thus, understanding solubility of conjugated polymers is crucial for their rational design. Using a combination of

Do Very Small POSS Nanoparticles Perturb s-PMMA Chain Conformations?

July 21, 2018
Author(s)
Nicolas Jouault, Sanat K. Kumar, Robert J. Smalley, Changzai Chi, Robert Moneta, Barbara Wood, Holly Salerno, Yuri B. Melnichenko, Lilin He, William E. Guise, Boualem Hammouda, Michael K. Crawford
Small-Angle Neutron Scattering (SANS) measurements of polymers mixed with weakly attractive 1.0 nm diameter polyhedral oligomeric silsesquioxane (POSS) nanoparticles (NPs) show no observable changes in the chain radius of gyration R g, regardless of the

Effect of temperature on the structure and dynamics of triblock copolymer coacervate hydrogels

July 16, 2018
Author(s)
Vivek M. Prabhu, Ryan C. Nieuwendaal, Anand Rahalkar, Juan J. DePablo, Samanvaya Srivastava, Matthew Tirrell
Triblock copolymer coacervate gels were characterized by small-angle neutron scattering (SANS) and dynamic light scattering. The oppositely charged polyelectrolyte complex core size does not change with temperature. However, the neutral middle block that

Nature of Decahydro-Closo-Decaborate Anion Reorientations in an Ordered Alkali-Metal Salt: Rb 2 B 10 H 10

July 12, 2018
Author(s)
Mirjana NMN Dimitrievska, Vitalie Stavila, Alexei V. Soloninin, Roman V. Skoryunov, Olga A. Babanova, Hui Wu, Wei Zhou, Wan Si Tang, Antonio Faraone, Jacob Daniel Tarver, Benjamin Trump, Alexander V. Skripov, Terrence J. Udovic
The ordered monoclinic phase of the alkali-metal decahydro-closodecaborate salt Rb 2B 10H 10 was found to be stable from about 250 K all the way up to an order-disorder phase transition temperature of approximately equal} 762 K. The broad temperature range
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