A5076945603- Nuclear Physics and Applications
- Analytical Chemistry and Sensors
- Electrostatics and Colloid Interactions
- Ammonia Synthesis and Nitrogen Reduction
- NMR spectroscopy and applications
- Advanced Cellulose Research Studies
- Atomic and Subatomic Physics Research
- Phase Equilibria and Thermodynamics
- Chemical Synthesis and Characterization
- Lipid Membrane Structure and Behavior
- Enzyme Production and Characterization
- Hydrogen Storage and Materials
- Polysaccharides and Plant Cell Walls
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- Covalent Organic Framework Applications
- Biosensors and Analytical Detection
- Supramolecular Chemistry and Complexes
- Proteins in Food Systems
- Polymer Surface Interaction Studies
- Polymer crystallization and properties
- Pediatric health and respiratory diseases
- Thin-Film Transistor Technologies
- Metal-Organic Frameworks: Synthesis and Applications
- Biofuel production and bioconversion
Oak Ridge National Laboratory
2008-2023
We employed time-resolved, in situ neutron reflectometry to observe a dynamic electrode–electrolyte interface under conditions relevant Li-mediated electrochemical N2 reduction reaction (NRR). This method leverages the sensitivity of neutrons Li and fast time resolution (∼1 min) formation layer containing species at electrode surface within minutes applying current density (−0.1 mA/cm2). Notably, first 6 min, we did not solid-electrolyte interphase (SEI) distinct from this layer, providing...
In situ neutron reflectometry and GI-XRD reveal the dynamics of SEI formation layer composition during Li-NRR with current cycling.
Lipopolysaccharides (LPS) make up approximately 75% of the Gram-negative bacterial outer membrane (OM) surface, but because complexity molecule, there are very few model OMs that include LPS. The LPS molecule consists lipid A, which anchors within OM, a core polysaccharide region, and variable O-antigen chain. In this work we used RcLPS (consisting A plus first seven sugars polysaccharide) from rough strain Escherichia coli to form stable monolayers at air-liquid interface. vertical...
The Quite Intense Kinetics Reflectometer (QIKR) will be a general-purpose, horizontal-sample-surface neutron reflectometer. Reflectometers measure the proportion of an incident probe beam reflected from surface as function wavevector (momentum) transfer to infer distribution and composition matter near interface. unique scattering properties neutrons make this technique especially useful in study soft matter, biomaterials, materials used energy storage. Exploiting increased brilliance...
An aluminum (Al)-based electrocoagulation (EC) system can effectively remove dissolved silica and hardness in groundwater. The effectiveness of Al-EC terms pollutant removal, Faradaic efficiency, energy consumption depends on the interfacial electrolysis or passivation electrode water. Thus, understanding reaction at liquid/electrode interface during operation is important for sustainable EC deployment. A continuous flow-through was tested with various groundwater simulants, i.e., chloride...
Improving the efficiency of enzymatic hydrolysis cellulose is one key technological hurdles to reduce cost producing ethanol and other transportation fuels from lignocellulosic material. A better understanding how soluble enzymes interact with insoluble will aid in design more efficient enzyme systems. We report a study involving neutron reflectometry (NR) quartz crystal microbalance dissipation monitoring (QCM-D) interaction fungal extract (T. viride) an endoglucanse A. niger amorphous...
Despite the fact that numerous studies have been conducted to explore crystalline structures of various metal–organic polyhedrons (MOPs), direct probing solvated and deformed MOPs is still rare but critical development processing protocols understanding their structure–property relationship for gas separation ion transportation. Here, from coordination isophthalic acids Cu2+ are covalently functionalized with alkyl chains in solutions at air/water interface, respectively. As suggested...
A study of the interaction four endoglucanases with amorphous cellulose films by neutron reflectometry (NR) and quartz crystal microbalance dissipation monitoring (QCM-D) is reported. The include a mesophilic fungal endoglucanase (Cel45A from H. insolens), processive marine bacterium (Cel5H S. degradans ), two thermophilic bacteria (Cel9A A. acidocaldarius Cel5A T. maritima ). use motivated promise ionic liquid pretreatment as second generation technology that disrupts native crystalline...
The SNS Liquids Reflectometer [1 See http://neutrons.ornl.gov/instrument_systems/beamline_04b_lr/index.shtml [Google Scholar]], installed as one of the first instruments at Spallation Neutron Source, has now been functional for more than a year. This instrument is designed to view liquid and solid surfaces in specular, off near-surface small angle scattering geometries. guide system supplies 2 Å < λ 16.5 neutrons vertical incident angles ranging from 0° αi 5.5° free up 45° surfaces. Three...
Neutron scattering techniques offer several unique opportunities in materials research. However, most neutron experiments suffer from the limited flux available at current facilities. This limitation becomes even more severe if time-resolved or kinetic are performed. A new method has been developed which overcomes these limitations when a reversible process is studied, without any compromise on resolution beam intensity. It demonstrated that, by recording absolute time detector events linked...
We present a neutron reflectivity study on interfaces in contact with flowing hexadecane, which is known to exhibit surface slip functionalized solid surfaces. The single crystalline silicon substrates were either chemically cleaned Si(100) or coated by octadecyl-trichlorosilane (OTS), resulted different interfacial energies. liquid was sheared situ and changes profiles compared the static case. For OTS surface, temperature dependence also recorded. both types of interfaces, density...
Understanding the origin for film stratification of electron donor/acceptor blend is crucial high efficiency organic photovoltaic cell. In this study, P3HT:PCBM deposited onto hydrophilic and hydrophobic substrate to examine stratifications. The neutron reflectivity results show that, on different surfaces, PCBM diffuses toward two interfacial regions in an identical fashion during thermal annealing. This evidences that not affected by substrates. Instead, since P3HT remains more amorphous...
Neutron reflectometry (NR) was employed to study the interaction of nanosized silica particles with a flat surface in aqueous solutions. Unlike other experimental tools that are used interactions, NR can provide information on particle density profile solution near interface. Two types (25 and 100 nm) were suspended solutions varying ionic strength. Theoretical calculations potential between using Derjaguin-Landau-Verwey-Overbeek (DLVO) theory compared data. The predicts energy is highly...
Our evaluation of a high-resolution digital imaging detector capable providing millisecond time resolution and high sensitivity for neutrons is presented. This modified version the gamma-ray imager developed previously at Radiation Monitoring Devices, Inc. (RMD, Inc.), consists an Electron Multiplying Charge Coupled Device (EMCCD) attached to neutron-sensitive scintillator via fiberoptic taper. By virtue its internal gain, EMCCD permits speed readout without introducing additional noise,...
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionCorrection to Structural Characterization of Model Gram-Negative Bacterial Surface Using Lipopolysaccharides from Rough Strains Escherichia coliAnton P. Le Brun, Luke A. Clifton, Candice E. Halbert, Binhua Lin, Mati Meron, Peter J. Holden, Jeremy H. Lakey, and Stephen Holt*Cite this: Biomacromolecules 2014, 15, 8, 3213Publication Date (Web):July 24, 2014Publication History Published online24...
The Liquids Reflectometer (LR) Instrument installed at the Spallation Neutron Source (SNS) enables observations of chemical kinetics, solid-state reactions, phase-transitions and reactions in general [1]. ability instrument to complete measurements quickly therefore process many samples is a key capability inherent system design [2]. Alignment sample environment management are time consuming error prone that has led development automation control software operating instrument. In fact,...