A5045962178- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Quantum, superfluid, helium dynamics
- Physics of Superconductivity and Magnetism
- Nuclear reactor physics and engineering
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Radiation Detection and Scintillator Technologies
- Neurofibromatosis and Schwannoma Cases
- Cold Atom Physics and Bose-Einstein Condensates
- NMR spectroscopy and applications
- Quantum Mechanics and Applications
- Planetary Science and Exploration
- Mesoporous Materials and Catalysis
- Superconducting Materials and Applications
- Thermal and Kinetic Analysis
- Proteoglycans and glycosaminoglycans research
- Fullerene Chemistry and Applications
- Radiation Therapy and Dosimetry
- Protein Tyrosine Phosphatases
- Radioactive Decay and Measurement Techniques
- Methane Hydrates and Related Phenomena
- X-ray Diffraction in Crystallography
- High Entropy Alloys Studies
Oak Ridge National Laboratory
2017-2025
IIT@MIT
2024
Indiana University Bloomington
2013-2020
Oak Ridge Associated Universities
2020
University of Missouri
2020
Perinatal Institute
2012
Indiana University School of Medicine
2004-2007
Indiana University – Purdue University Indianapolis
2004-2007
The development of synthetic and naturally occurring scaffolds for tissue engineering applications has included strategies to promote attachment specific cell types, control the rate scaffold degradation, encourage angiogenesis, or otherwise modulate host response. We have reported that bioscaffolds developed from porcine small intestinal submucosa (SIS) facilitate constructive remodeling tissues recruit marrow-derived cells persist long after acute inflammatory stages resolved. not yet...
Spontaneous symmetry breaking—the phenomenon in which an infinitesimal perturbation can cause the system to break underlying symmetry—is a cornerstone concept understanding of interacting solid-state systems. In typical series temperature-driven phase transitions, higher-temperature phases are more symmetric due stabilizing effect entropy that becomes dominant as temperature is increased. However, opposite rare but possible when there multiple degrees freedom system. Here, we present such...
A scintillator-based Timepix3 (TPX3) detector was developed to resolve the high-frequency modulation of a neutron beam in both spatial and temporal domains, as required for spin-echo experiments. In this system, light from scintillator is manipulated with an optical lens intensified using image intensifier, making it detectable TPX3 chip. Two different scintillators, namely, 6LiF:ZnS(Ag) 6LiI:Eu, were investigated achieve high resolution needed modulated small-angle scattering (SEMSANS)...
Stöber silica particles are used in a diverse range of applications. Despite their widespread industrial and scientific uses, information on the internal structure is non-trivial to obtain not often reported. In this work we have spin-echo small angle neutron scattering (SESANS) conjunction with ultra X-ray (USAXS) pycnometry study an aqueous dispersion particles. Our results agreement models which propose that porous core, significant fraction pores inaccessible solvent. For samples...
The study of high-entropy materials has attracted enormous interest since they could show new functional properties that are not observed in their related parent phases. Here, we report single crystal growth, structure, thermal transport, and magnetic property studies on a novel oxide with the spinel structure (MgMnFeCoNi)Al2O4. We have successfully grown high-quality crystals this using optical floating zone growth technique for first time. sample was confirmed to be phase pure x-ray...
Neurofibromatosis type I (NF1) is a genetic disorder caused by mutations in the NF1 tumor suppressor gene. Neurofibromin encoded and functions as negative regulator of Ras activity. Somatic residual normal allele within cancers patients consistent with functioning tumor-suppressor. However, prevalent non-malignant manifestations NF1, including learning bone disorders emphasize importance dissecting cellular biochemical effects haploinsufficiency multiple cell lineages. One least studied...
A magnetic Wollaston prism can spatially split a polarized neutron beam into two beams with different spin states, in manner analogous to an optical prism. Such be used encode the trajectory of neutrons Larmor phase associated their degree freedom. This encoding for phase-contrast radiography and echo scattering angle measurement (SESAME). In this paper, we show that prisms highly uniform fields low aberration constructed preserve polarization using high temperature superconducting (HTS)...
We present a new instrument for spin echo small angle neutron scattering (SESANS) developed at the Low Energy Neutron Source Indiana University. A description of various components is given along with performance these components. At heart are series resistive coils to encode trajectory into polarisation. These shown work well over broad range wavelengths. polarisation analysis accomplished using continuously operating filter polarised by Rb spin-exchange optical pumping (3)He. describe...
The spin echo modulated small-angle neutron scattering technique has been implemented using two superconducting magnetic Wollaston prisms at a reactor source. density autocorrelation function measured for test sample of colloidal silica in suspension agrees with that obtained previously by other methods on an identically prepared sample. reported apparatus number advantages over competing technologies: it should allow larger length scales (up to several micrometres) be probed; very small...
The initial formation stages of surfactant-templated silica thin films which grow at the air–water interface were studied using combined spin–echo modulated small-angle neutron scattering (SEMSANS) and (SANS). are formed from either a cationic surfactant or nonionic (C16EO8) in dilute acidic solution by addition tetramethoxysilane. Previous work has suggested two stage mechanism with mesostructured particle bulk driving film surface. From SEMSANS data, it is possible to pinpoint accurately...
Fullerene derivatives are used in a wide range of applications including as electron acceptors solution-processable organic photovoltaics. We report agglomeration fullerene optically opaque solutions PC61BM and PC71BM, with concentrations ranging from 30 mg mL-1 up to 90 mL-1, different solvents relevance photovoltaics, using novel neutron scattering technique, Spin-Echo Small Angle Neutron Scattering (SESANS). From SESANS, agglomerates correlation lengths larger than 1 μm found some...
The development of direct probes entanglement is integral to the rapidly expanding field complex quantum materials. Here we test robustness entangled neutrons as a probe by measuring Clauser-Horne-Shimony-Holt contextuality witness while varying beam properties. Specifically, show that mode spin and path subsystems individual prepared in two different experiments using apparatuses persists even after length, coherence neutron energy difference paths. independent acting entangler-disentangler...
We show the implementation of superconducting magnetic Wollaston prisms for spin echo small-angle neutron scattering. Two calibration methods length are presented: one utilizing modulated scattering and other based on refraction by quartz wedge crystals. Our experimental results with polystyrene nano-particle colloids showcase system's efficacy in measuring both dilute concentrated colloidal systems. Additionally, investigations into pore diameter pitch a nano-porous alumina membrane...
Abstract The neutron Larmor diffraction technique has been implemented using superconducting magnetic Wollaston prisms in both single-arm and double-arm configurations. Successful measurements of the coefficient thermal expansion a single-crystal copper sample demonstrates that method works as expected. experiment involves new tuning by varying field configurations device results agree well with previous measurements. difference between investigated experimentally. We conclude this...
Despite the challenges, neutron resonance spin echo still holds promise to improve upon for measurement of slow dynamics in materials. We present a bootstrap, radio frequency flipper using high temperature superconducting technology capable flipping with either nonadiabatic or adiabatic modes. A 2 MHz has been achieved, which would achieve an effective field integral 0.35 T m meter separation spectrometer at current device specifications. In bootstrap mode, self-cancellation Larmor phase...
Mutations in the NF1 tumor suppressor gene cause Neurofibromatosis type 1 (NF1). Neurofibromin, protein product of NF1, functions as a negative regulator Ras activity. Some patients develop cardiovascular disease, which represents an underrecognized disease complication and contributes to excess morbidity mortality. Specifically, arterial occlusion resulting tissue ischemia sudden death. Murine studies demonstrate that heterozygous inactivation Nf1 (Nf1+/−) bone marrow cells enhances...
Abstract To investigate long length scale structures using neutron scattering, real space techniques have shown certain advantages over the conventional methods working in reciprocal space. As one of measurement techniques, spin echo modulated small angle scattering (SEMSANS) has attracted attention, due to its relaxed constraints on sample environment and possibility combine SEMSANS a instrument. In this report, we present first implementation at pulsed source discuss important corrections...
It is well-known that the Meissner effect in superconducting materials can be used to provide a well-defined non- adiabatic magnetic field transition utilised produce an efficient white beam neutron spin flipper. Typically these devices utilise niobium and hence require continuous use of liquid helium order maintain device tem- perature. The high Tc removes need for cryogens has been explored previously shown flipping spin. Improvements thin films over past few years make even more...
A new method of implementing neutron spin echo measurement phonon linewidths on a triple-axis spectrometer is introduced, based recently developed superconducting magnetic Wollaston prisms. Each arm the composed two prisms with rectangular field region between them. By introducing triangular and regions, loci constant phase can be manipulated easily to achieve so-called focusing condition. Unlike resonance method, which tuned by physically tilting boundaries, device electromagnetically...
The first measurements of magnetic correlation functions are presented using time-of-flight Spin-echo modulated small angle neutron scattering (SEMSANS) on the Larmor instrument at ISIS pulsed source. accessible length scale is beyond that conventional SANS. A simplified model to calculate expected for various magnetisation fields applied sample. As an example, we present experimental data a soft iron sample configurations field.
Intra-particle entanglement of individual particles such as neutrons could enable another class scattering probes that are sensitive to in quantum systems and materials. In this work, we present experimental results demonstrating contextuality a result between the spin energy modes (i.e., degrees freedom) single beam using pair resonant radio-frequency neutron flippers MIEZE configuration (Modulated IntEnsity with Zero Effort). We verified mode-entanglement by measuring...