Erik B. Watkins
Los Alamos National Laboratory
Publications 72
#1Joseph H. Dumont (LANL: Los Alamos National Laboratory)H-Index: 4
#2Andre J Spears (LANL: Los Alamos National Laboratory)
Last.Yu Seung Kim (LANL: Los Alamos National Laboratory)H-Index: 40
view all 9 authors...
Interactions between catalyst and electrolyte have paramount importance for the performance of electrochemical devices. Here, we present the cation-hydroxide-water co-adsorption on Pt surface by a rotating disk electrode and neutron reflectometry. The rotating disk electrode experiments show that the current density of Pt rapidly dropped at hydrogen oxidation potentials due to tetramethylammonium hydroxide (TMAOH)-water co-adsorption. Subsequent neutron reflectometry in 0.1 M TMAOD/D2O reveals t...
#1Crystal M. Vander Zanden (UNM: University of New Mexico)H-Index: 1
#2Lois Wampler (A&M: Texas A&M University)H-Index: 1
Last.Eva Y. Chi (UNM: University of New Mexico)H-Index: 24
view all 6 authors...
In Alzheimer’s disease, the amyloid-beta peptide (Aβ) is implicated in neuronal toxicity via interactions with the cell membrane. Monomeric Aβ (Aβm) is intrinsically disordered, but it can adopt a range of aggregated conformations with varying toxicities from short fibrillar oligomers (FO), to globular nonfibrillar oligomers (NFO), and full-length amyloid fibrils. NFO is considered to be the most toxic, followed by fibrils, and finally Aβm. To elucidate molecular-level membrane interactions that...
1 CitationsSource
#1Michael Bagge-Hansen (LLNL: Lawrence Livermore National Laboratory)H-Index: 10
#2Sorin Bastea (LLNL: Lawrence Livermore National Laboratory)H-Index: 13
Last.Trevor M. Willey (LLNL: Lawrence Livermore National Laboratory)H-Index: 22
view all 24 authors...
Transit through the carbon liquid phase has significant consequences for the subsequent formation of solid nanocarbon detonation products. We report dynamic measurements of liquid carbon condensation and solidification into nano-onions over ∽200 ns by analysis of time-resolved, small-angle X-ray scattering data acquired during detonation of a hydrogen-free explosive, DNTF (3,4-bis(3-nitrofurazan-4-yl)furoxan). Further, thermochemical modeling predicts a direct liquid to solid graphite phase tran...
3 CitationsSource
#1Erik B. Watkins (LANL: Los Alamos National Laboratory)H-Index: 15
#2Jaroslaw Majewski (UNM: University of New Mexico)H-Index: 32
Last.Ludger Johannes (PSL Research University)H-Index: 55
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Biomembranes are hard to compress laterally, and membrane area compressibility has not been associated with biological processes. Using X-ray surface scattering, we observed that bacterial Shiga toxin compresses lipid packing in a gel phase monolayer upon binding to its cellular receptor, the glycolipid Gb3. This toxin-induced reorganization of lipid packing reached beyond the immediate membrane patch that the protein was bound to, and linkers separating the Gb3 carbohydrate and ceramide moietie...
1 CitationsSource
#1Andrew Abbott (University of Dayton Research Institute)
#2Brittany Branch (SNL: Sandia National Laboratories)H-Index: 8
Last.John D. Yeager (LANL: Los Alamos National Laboratory)H-Index: 12
view all 41 authors...
#1Crystal M. Vander Zanden (UNM: University of New Mexico)H-Index: 1
#2Jaroslaw Majewski (LANL: Los Alamos National Laboratory)H-Index: 32
Last.Eva Y. Chi (UNM: University of New Mexico)H-Index: 24
view all 4 authors...
#1M. ProtatH-Index: 1
#2N. Bodin-ThomazoH-Index: 1
Last.Patrick GuenounH-Index: 24
view all 10 authors...
Stable stimuli-responsive emulsions between oil and water are formed with an amphiphilic block copolymer bearing polystyrene (PS) and poly(dimethylaminoethyl methacrylate) (PDMAEMA) moieties. Different kinds of emulsions like direct, multiple or inverse ones are reproducibly formed as a function of chemical parameters such as p H and salt concentration. To test the correlation between the different nature of the emulsion and the conformation of the polymer chain at the interface, neutron reflect...
#1Michael H. Nielsen (LLNL: Lawrence Livermore National Laboratory)H-Index: 4
#2Joshua A. Hammons (LLNL: Lawrence Livermore National Laboratory)H-Index: 8
Last.Trevor M. Willey (LLNL: Lawrence Livermore National Laboratory)H-Index: 22
view all 16 authors...
A centimeter-scale field of view for transmission X-ray radiography from a sub-millimeter-focused synchrotron X-ray beam is achieved by placing a strongly scattering material upstream of the sample. Combining the scattered beam with a detector system synchronized and gated to acquire images from single X-ray pulses provides the capability for time-resolved observations of transient phenomena in samples larger than the native X-ray beam. Furthermore, switching between this scatter-beam imaging (S...
2 CitationsSource
#1Ronald Owen NelsonH-Index: 12
#2Sven C. VogelH-Index: 37
Last.Nicola M. WinchH-Index: 4
view all 27 authors...
In recent years, neutron radiography and tomography have been applied at different beam lines at Los Alamos Neutron Science Center (LANSCE), covering a very wide neutron energy range. The field of energy-resolved neutron imaging with epi-thermal neutrons, utilizing neutron absorption resonances for contrast as well as quantitative density measurements, was pioneered at the Target 1 (Lujan center), Flight Path 5 beam line and continues to be refined. Applications include: imaging of metallic and ...
4 CitationsSource
#1Erik B. Watkins (LANL: Los Alamos National Laboratory)H-Index: 15
#2Shelli L. Frey (U of C: University of Chicago)H-Index: 11
Last.Kyc Lee (U of C: University of Chicago)H-Index: 39
view all 7 authors...
Abstract The influence of carbohydrate structure on the ordering of glycosphingolipids (GSLs) and surrounding phospholipids was investigated in monolayers at the air-water interface. Binary mixtures composed of GSLs, chosen to span a range of carbohydrate complexity, and zwitterionic dipalmitoylphosphatidylcholine phospholipid, were studied. X-ray reflectivity was used to measure the out-of-plane structure of the monolayers and characterize the extension and conformation of the GSL carbohydrates...