A5033420158- Surfactants and Colloidal Systems
- Quantum optics and atomic interactions
- Pickering emulsions and particle stabilization
- Quantum Information and Cryptography
- Material Dynamics and Properties
- Nuclear Physics and Applications
- Rheology and Fluid Dynamics Studies
- Diamond and Carbon-based Materials Research
- Advanced Fiber Laser Technologies
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Enhanced Oil Recovery Techniques
- Advanced Polymer Synthesis and Characterization
- Mesoporous Materials and Catalysis
- Atomic and Subatomic Physics Research
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Lattice Boltzmann Simulation Studies
- Optical Network Technologies
- Advanced X-ray Imaging Techniques
- Granular flow and fluidized beds
- Lipid Membrane Structure and Behavior
- High-pressure geophysics and materials
- Advanced Sensor and Energy Harvesting Materials
- Radiation Detection and Scintillator Technologies
- Microfluidic and Capillary Electrophoresis Applications
NIST Center for Neutron Research
2020-2025
National Institute of Standards and Technology
2020-2025
University of Delaware
2013-2024
MIT Lincoln Laboratory
2015-2024
Massachusetts Institute of Technology
2018-2024
Newark Hospital
2020
National Institute of Standards
2020
K Lab (United States)
2015
Practical quantum networks require interfacing memories with existing channels and systems that operate in the telecom band. Here we demonstrate low-noise, bidirectional frequency conversion enables a solid-state memory to directly interface telecom-band systems. In particular, of visible-band single photons emitted from silicon-vacancy (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><a:mi>Si</a:mi></a:math><d:math...
A description and the performance of very small angle neutron scattering diffractometer at National Institute Standards Technology are presented. The measurement range instrument extends over three decades momentum transfer
This work thoroughly examines several analytical tools, each possessing a different level of mathematical intricacy, for the purpose characterizing orientation distribution function elongated objects under flow. Our investigation places an emphasis on connecting to small angle scattering spectra measured experimentally. The diverse range approaches investigated herein provides insights into flow behavior particles from perspectives and serves as powerful tools elucidating complex interplay...
Herein we report the potential of click chemistry-modified polypeptide-based block copolymers for facile fabrication pH-sensitive nanoscale drug delivery systems. PEG–polypeptide with pendant amine chains were synthesized by combining N-carboxyanhydride-based ring-opening polymerization post-functionalization using azide–alkyne cycloaddition. The contain a polypeptide amine-functional side groups and found to self-assemble into stable polymersomes disassemble in pH-responsive manner under...
The rheology and shear-induced structures of a series self-assembled surfactant wormlike micelles (WLMs) with varying levels branching are measured using rheo- flow-small angle neutron scattering (SANS). degree in the mixed cationic/anionic (cetyltrimethylammonium tosylate/sodium dodecyl benzene sulfonate) WLMs is controlled via addition hydrotropic salt sodium tosylate verified by cryo-transmission electron microscopy. linear viscoelasticity low (linear) micellar solutions well described as...
Abstract Soft materials are usually defined as made of mesoscopic entities, often self-organised, sensitive to thermal fluctuations and weak perturbations. Archetypal examples colloids, polymers, amphiphiles, liquid crystals, foams. The importance soft in everyday commodity products, well technological applications, is enormous, controlling or improving their properties the focus many efforts. From a fundamental perspective, possibility manipulating material properties, by tuning...
We report the aqueous solution self-assembly of a series poly(N-isopropylacrylamide) (PNIPAM) polymers end-functionalized with hydrophobic sulfur–carbon–sulfur (SCS) pincer ligand. Although ligand accounted for <5 wt % overall homopolymer mass, self-assembled into well-defined spherical micelles in solution, and these are potential precursors to solution-assembled nanoreactors small molecule catalysis applications. The micelle structural details were investigated using light scattering,...
Dynamic arrest transitions of colloidal suspensions containing nonspherical particles are interest for the design and processing various particle technologies. To better understand effects shape anisotropy attraction strength on gel glass formation, we present a model system octadecyl-coated silica rods, termed as adhesive hard rods (AHR), which enables control rod aspect ratio temperature-dependent interactions. The ratios were controlled by varying initial TEOS concentration following work...
Capillary rheometry is combined with small-angle neutron scattering to simultaneously measure the viscosity and nanostructure of complex fluids containing proteins, surfactants, polymers, inorganic nanoparticles at shear rates up 10<sup>6</sup> s<sup>−1</sup>.
This work thoroughly examines several analytical tools, each possessing a different level of mathematical intricacy, for the purpose characterizing orientation distribution function elongated objects under flow. Our investigation places an emphasis on connecting to small-angle scattering spectra measured experimentally. The diverse range approaches investigated herein provide insights into flow behavior particles from perspectives and serve as powerful tools elucidating complex interplay...
Chain exchange between block polymer micelles in highly selective solvents, such as water, is well-known to be arrested under quiescent conditions, yet this work demonstrates that simple agitation methods can induce rapid chain these solvents. Aqueous solutions containing either pure poly(butadiene-b-ethylene oxide) or oxide-d4) were combined and then subjected by vortex mixing, concentric cylinder Couette flow, nitrogen gas sparging. Subsequently, the extent of was quantified using small...
Hypothesis Understanding the scission of rod-like micelles under mechanical forces is crucial for optimizing their stability and behavior in industrial applications. This study investigates how micelle length, flexibility, external interact, offering insights into design micellar systems processes influenced by stress. Although significant, direct experimental observations flow-induced using scattering techniques remain scarce. Experiments Simulations Small angle neutron (SANS) used to...
Rod-like particles are efficient rheology modifiers and commonly found in a variety of biological industrially relevant suspensions, from biofilaments to worm-like surfactant micelles. These suspensions display strong shear-thinning behavior, ongoing efforts aim understand the microstructural changes these fluids: how they depend upon properties suspended manifest resulting rheology. With fd bacteriophage as model monodisperse rod system, we use capillary microrheometry flow birefringence...
The conversion of gaseous CO2 into a solid constitution through mineralization is an active area carbon capture, and alkaline earth metal hydroxides (M(OH)2, M = Ca2+, Mg2+) are frontrunners in this area. As model systems, nanolime samples excellent templates for the study reaction. Here, we have examined these under ambient pressure conditions with controlled humidity CO2. Utilizing broad range analytical methods, first established purity structures selected materials. We then structural...
Rheological, electrochemical, and microstructural properties of graphene oxide suspensions as flowable electrodes for energy storage.
Inclusion of polymer additives is a known strategy to improve foam stability, but questions persist about the amount incorporated in and resulting structural changes that impact material performance. Here, we study these sodium dodecyl sulfate (SDS)/hydroxypropyl methylcellulose (HPMC) foams using combination flow injection QTOF mass spectrometry small-angle neutron scattering (SANS) measurements leveraging contrast matching. Mass results demonstrate incorporation retention during drainage...
Short-wave infrared (SWIR) emitters are at the center of ground-breaking applications in biomedical imaging, next-generation optoelectronic devices, and optical communications. Colloidal nanocrystals based on indium arsenide some most promising SWIR to date. However, lack single-particle spectroscopic methods accessible has prevented advances both nanocrystal synthesis fundamental characterization emitters. Here, we demonstrate an implementation a solution photon correlation Fourier...
Gel and glass transitions are systematically measured mapped onto a fundamental state diagram for rod-like particles with short-range attractions.
Measurement and prediction of suspension flow properties in cylindrical geometries represent a significant challenge for both the experimentalist modeler. In this paper, results computational study pipe geometry using method based on smoothed particle hydrodynamics are presented. Flow fields spatial distribution solid spherical inclusions case will be shown as function matrix fluid (including Newtonian, shear thinning, thickening), driving force, volume fraction particles. Simulation...
This work explores the complex interplay between slurry aggregation, agglomeration, and conformation (i.e., shape) of poly(acrylic acid) (PAA)- lithiated PAA-based silicon slurries as a function shear rate resulting homogeneity. These values were measured by small-angle neutron scattering (SANS) rheology-coupled ultra-SANS at conditions relevant to battery electrode casting. Different binder solution preparation methods, either ball milling (BM) process or planetary centrifugal mixing (PCM)...