A5089958773- Liquid Crystal Research Advancements
- Advanced Fluorescence Microscopy Techniques
- Aerogels and thermal insulation
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Photochemistry and Electron Transfer Studies
- Molecular spectroscopy and chirality
- Advanced Sensor and Energy Harvesting Materials
- Carbon dioxide utilization in catalysis
- Photodynamic Therapy Research Studies
- Plant Reproductive Biology
- Diamond and Carbon-based Materials Research
- Magnetic confinement fusion research
- Cell Image Analysis Techniques
- Lanthanide and Transition Metal Complexes
- Silicone and Siloxane Chemistry
- Metabolomics and Mass Spectrometry Studies
- Photorefractive and Nonlinear Optics
- Medical Imaging Techniques and Applications
- Semiconductor materials and devices
- Plasma Diagnostics and Applications
- Anorectal Disease Treatments and Outcomes
- Luminescence and Fluorescent Materials
- Photonic and Optical Devices
- Quantum optics and atomic interactions
General Atomics (United States)
2021-2024
Fusion Academy
2023
Ministry of Health
2023
Centre Lasers Intenses et Applications
2021
Laboratoire pour l'utilisation des lasers intenses
2021
University of Chicago
2021
National Research Nuclear University MEPhI
2021
Helmholtz-Zentrum Dresden-Rossendorf
2021
University of Michigan
2021
Glenn Research Center
2017
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Paul D. Cunningham, Nestor N. Valdes, Felipe A. Vallejo, L. Michael Hayden, Brent Polishak, Xing-Hua Zhou, Jingdong Luo, Alex K.-Y. Jen, Jarrod C. Williams, Robert J. Twieg; Broadband terahertz characterization of the refractive index absorption some important polymeric organic electro-optic materials. Appl....
Superresolution imaging techniques based on sequential of sparse subsets single molecules require fluorophores whose emission can be photoactivated or photoswitched. Because typical organic emit significantly more photons than average fluorescent proteins, have a potential advantage in super-resolution schemes, but targeting to specific cellular proteins must provided. We report the design and application HaloTag-based target-specific azido DCDHFs, class photoactivatable push−pull fluorogens...
Precise imaging of the cell surface fluorescently labeled bacteria requires super-resolution methods because size-scale these cells is on order diffraction limit. In this work, we present a photocontrollable small-molecule rhodamine spirolactam emitter suitable for non-toxic and specific labeling outer three-dimensional (3D) (SR) imaging. Conventional spirolactams photoswitch to emitting form with UV light; however, wavelengths can damage cells. We extended photoswitching visible >400 nm by...
We report here the fabrication of polyamide aerogels composed poly-p-phenylene-terephthalamide, same backbone chemistry as DuPont's Kevlar. The all-para-substituted polymers gel without use cross-linker and maintain their shape during processing-an improvement over meta-substituted cross-linked reported previously. Solutions containing calcium chloride (CaCl2) para-phenylenediamine (pPDA) in N-methylpyrrolidinone (NMP) at low temperature are reacted with terephthaloyl (TPC). Polymerization...
We report the first synthesis of step-growth aromatic polyamide (PA) aerogels made using amine end-capped oligomers cross-linked with 1,3,5-benzenetricarbonyl trichloride (BTC). Isophthaloyl chloride (IPC) or terephthaloyl (TPC) were combined m-phenylenediamine (mPDA) in N-methylpyrrolidinone (NMP) to give amine-capped formulated up 40 repeat units. Addition cross-linker, BTC, typically induces gelation under 5 min. Solvent exchange resulting gels into ethanol followed by supercritical CO2...
We report an induction of the blue phase III (BPIII) at a relatively low and wide (over 20 °C) temperature range in nematogenic achiral bent-core liquid crystals doped with high twisting power chiral material. The pitch decreases increasing dopant ratio, easily reaches ultraviolet wavelength, so that completely dark texture is obtained under crossed polarizers. Electrooptical switching was achieved time few to tens milliseconds. propose for stabilization BPIII broad-temperature smectic...
Small angle X-ray diffraction from the uniaxial nematic phase of certain bent-core liquid crystals is shown to be consistent with presence molecular clusters possessing short-range tilted smectic (smectic-C) order. Persistence these throughout phase, and even into isotropic state, likely accounts for unusual macroscopic behavior previously reported in nematics, including an anomalously large flexoelectric effect (∼ 1000 times that conventional calamitic nematics), very orientational flow...
With unique advantages over inorganic aerogels including higher strengths and compressive moduli, greater toughness, the ability to be fabricated as a flexible thin film, polymer have potential supplant in numerous applications. Among aerogels, polyimide possess high degree of thermal stability well outstanding mechanical properties. However, while onset decomposition for these materials is typically very (greater than 500 °C), undergo dramatic thermally induced shrinkage at temperatures...
Many modern super-resolution imaging methods based on single-molecule fluorescence require the conversion of a dark fluorogen into bright emitter to control concentration. We have synthesized and characterized nitro-aryl which can be converted by nitroreductase enzyme push-pull red-emitting fluorophore. Synthesis model compounds optical spectroscopy identify hydroxyl-amino derivative as product fluorophore, is detectable level for fluorogens attached surface. Solution kinetic analysis shows...
Foam targets have gained considerable importance over the last decade in laser–matter interaction. They find widespread applications such as inertial confinement fusion and secondary sources for particles radiation. At same time, advent of high repetition-rate laser systems, be they short-pulse tens femtosecond regime or kilo-Joule nanosecond regime, calls equally repetition rate targetry systems. A well-established system is tape target. In this article, we present successful marriage a...
The synthesis of several new truxenones and one tris(dicyanomethylene) derivative substituted by different amines at positions 4, 9, 14 is reported. A complete characterization the NLO properties representative derivatives was carried out hyper-Rayleigh scattering; major electronic effects influence structural modifications on have been examined. Because their C3 symmetry large first hyperpolarizability, chiral versions truxene are interest for second-order nonlinear optics in uniaxially...
Blast-wave-driven hydrodynamic instabilities are studied in the presence of a background B-field through experiments and simulations high-energy-density (HED) physics regime. In conducted at Laboratoire pour l’utilisation des lasers intenses (LULI), laser-driven shock-tube platform was used to generate hydrodynamically unstable interface with prescribed sinusoidal surface perturbation, short-pulse x-ray radiography characterize instability growth without 10-T B-field. The LULI were modeled...
Two new chiral liquid crystals containing a well-known mesogenic cholesteryl group and an azobenzene moiety connected with short flexible carbonyldioxy spacer polar carbonyl unit in terminal chain were designed synthesized. A sequence of very interesting mesophases observed. Their reversible photoresponsive properties well-demonstrated by UV irradiation. The two materials as dye dopants have large solubility common nematic crystal host, which can facilitate amount doping to induce mesophase...
Second-harmonic generation (SHG) is studied in the magnetically aligned nematic phase of a bent-core liquid crystal (BCN) and compared to similar measurements made on conventional rodlike (calamitic) compound. The second-harmonic (SH) light detected from both materials predominantly due scattering therefore incoherent. Results calamitic are consistent with polarization induced by ordinary director fluctuations phase. However, SH collected BCN exhibits different temperature angular...
Stress urinary incontinence (SUI) and pelvic organ prolapse (POP) are common floor disorders (PFDs). Owing to significant adverse events associated with mesh-related procedures (PFPs) in a proportion of the surgically treated population, deficits collection reporting these events, Australian Government identified an urgent need for tracking mechanism improve safety quality care. The Australasian Pelvic Floor Procedure Registry (APFPR) was recently established following 2018 Senate Committee...
Angle-resolved, second-harmonic-light scattering (SHLS) measurements are reported for three different classes of thermotropic nematic liquid crystals (NLCs): polar and nonpolar rodlike compounds a bent-core compound. Results revealing well-defined peaks interpreted in terms the electric polarization induced by distortions orientational field (``flexopolarity'') associated with inversion wall defects, nonsingular disclinations, analogous to Neel walls ferromagnets, that often exhibit closed...
We report on homodyne dynamic light scattering measurements of orientational fluctuation modes in both calamitic and bent-core nematic liquid crystals, carried out the new split-helix resistive magnet at National High Magnetic Field Laboratory. The relaxation rate inverse scattered intensity director fluctuations exhibit a linear dependence field-squared up to 25 tesla, which is consistent with strictly lowest order coupling tensor parameter Q field...
Boron-doped nanowires have promising applications in inertial confinement fusion. Developing an effective fabrication method for boron-doped is necessary further investigation into their use as targets. In this paper, we examine a that maximizes wire length and boron composition while minimizing time. Two boron-containing nanoparticles—pure nitride nanoparticles—were used dopants two possible materials: General Atomics–Carbon-Hydrogen (GA-CH) aerogel carbon-hydrogen (CH) polymer. Anodic...
General Atomics-Carbon Hydrogen (GA-CH) and Deuterium (GA-CD) aerogels have applications as inertial confinement fusion (ICF) targets at the National Ignition Facility, Omega Laser Z Pulsed Power Facility. However, experiments these facilities require fabrication of precise geometries aerogels, achievable only by machining. Unfortunately, machining low-density (<50 mg/cm3) GA-CH is difficult, given their fragile structure. Higher-density although easier to machine, are left with a small nub...
Spherical targets with a smooth uniform surface are required for inertial confinement fusion experiments. This paper examines polishing as method of decreasing the roughness tungsten (W) capsules, chromium (Cr) SiCH [Si-doped glow discharge polymer (GDP)] and GDP-coated General Atomics–Carbon Hydrogen (GA-CH) foam beads. As expected, increasing time spent metal (W, Cr) capsules corresponded to roughness. Despite decrease in overall Cr defects present batch initially were amplified through...