We have developed the first high-diffraction-efficiency two-dimensional (2-D) photonic crystals for molecular recognition and chemical sensing applications. prepared close-packed 2-D polystyrene particle arrays by self-assembly of spreading monolayers on mercury surfaces. The amazingly diffract 80% incident light. When a array was transferred onto hydrogel thin film showing volume change in response to specific analyte, spacing altered, shifting diffraction wavelength. These exhibit...

Poly(N-isopropylacrylamide) (PNIPAM) is the premier example of a macromolecule that undergoes hydrophobic collapse when heated above its lower critical solution temperature (LCST). Here we utilize dynamic light scattering, H-NMR, and steady-state time-resolved UVRR measurements to determine molecular mechanism PNIPAM's collapse. Our results indicate in collapsed state amide bonds PNIPAM do not engage interamide hydrogen bonding, but are bonded water molecules. At low temperatures,...

Nanoparticle coating: A suspension of colloidal particles in a water/propanol solution was layered onto water surface, where the self-assembled into ordered two-dimensional hexagonal crystal arrays (>280 cm2) within two minutes. These were transferred from surface to other substrates (see picture) and embedded chitosan hydrogel for visual detection pH value.

Multiprincipal element alloys usually exhibit earlier pop-in events than pure metals and dilute solid solutions during nanoindentation experiments. To understand the origin of this phenomenon, large-scale atomic simulations were performed on a series metallic materials to investigate underlying physics incipient plasticity at nanoscale. Statistical result shows that lattice distortion δ normalized critical pressure

High-entropy alloys (HEAs) with a heterogeneous grain structure have been revealed to possess excellent combination of strength and toughness. However, the atomic-level deformation mechanisms HEAs were not reported yet. In this work, physical models constructed based on experimental observation atomic simulations are performed investigate tensile behavior face centered cubic (FCC) CoNiFeAl x Cu 1-x at different strain rates (5 × 10 7 –1 s −1 ), Al concentration (x = 0.1, 0.2, 0.3 0.4)...

We measured the dispersion of absolute-differential Raman crosssections ammonium nitrate (NH 4 NO 3 ), pentaerythritol tetranitrate (PETN), trinitrotoluene (TNT), nitroamine (HMX), and cyclotrimethylene-trinitramine (RDX) in acetonitrile water solutions between 204 257 nm. The ultraviolet (UV) resonance Raman/differential cross-sections NH , PETN, TNT, HMX, RDX dramatically increase as excitation wavelength decreases deep into UV to are best resonance-enhanced by nm used here, while optimum...

We examined the deep UV 229 nm photochemistry of NaNO3 in solution and solid state. In aqueous excitation within NO3¯ strong π → π* transition causes photochemical reaction NO2¯ + O·. used resonance Raman spectroscopy to examine photon dose dependence band intensities measure a quantum yield 0.04 at pH 6.5. also response samples observe formation NO2¯. The is much smaller ∼10−8. state phenomena appear complex by showing significant on flux dose. At low flux/dose conditions bands appear,...

We developed a convenient and fast approach to preparing close-packed two-dimensional (2-D) particle arrays on mercury surfaces. Addition of cosolvents, such as alcohols, aqueous colloidal suspensions induces spreading self-assembly the particles into 2-D top surface. can fabricate large-area (>70 cm(2)) within 30 s. attached these functional hydrogel films that array spacings were altered by volume response environment. directly observed induced spacing changes using confocal laser scanning...

We report on a novel self-driven climbing of two-dimensional (2-D) ordered monolayer crystalline colloidal arrays (CCAs). This phenomenon can be used to rapidly and efficiently prepare large area, highly 2-D array CCA films various substrates. Large area polystyrene (PS) particle CCAs were fabricated water surfaces by needle tip flow technique. Introduction wet substrate through the surface causes onto due spreading pressure. method quickly numerous substrates including flat/curved glass...

Abstract Nanocrystalline (NC) metals and alloys are prone to mechanical thermal instability under force fields due their high Gibbs free energy, which limits industrial applications. In this work, by employing rotary swaging (RS), bulk NC Cu–15 at.% Al with both strength stability were prepared. Quasi-static tensile test results show that the yield is 1016 MPa. Moreover, grain growth temperature was retarded up 0.4 T m , higher than literature values. Microstructural characterizations...

We attached very small silica particles onto flexible monodisperse poly(N-isopropylacrylamide, PNIPAm) core synthesized by dispersion polymerization. These were to the partially swollen PNIPAm hydrolysis and condensation of tetraethoxysilane at 24 °C. The resulting particle-functionalized show reversible swelling shrinking as temperature is cycled. form close-packed-array photonic crystals (PCs) solvent evaporates; cores shrink a shell around pure dry they close pack. removed calcination,...

Nanopartikelbeschichtung: Eine Suspension kolloidaler Partikel in einer Wasser-Propanol-Lösung wurde auf eine Wasseroberfläche geschichtet, wo sich die geordnete zweidimensionale Strukturen (>280 cm2) organisierten. Diese wurden andere Trägermaterialien aufgebracht (siehe Bild) und einen Chitosan-Hydrogel-Film, der zum visuellen pH-Nachweis verwendet wurde, eingebettet.

Increasing evidence demonstrates that high-sensitivity C-reactive protein (hs-CRP) is an independent prognostic predictor in acute ischemic stroke (AIS) patients. The purpose of this study to investigate the association between hs-CRP levels and clinical outcomes AIS patients receiving endovascular therapy (EVT).This observational was based on a prospective registry study. EVT from December 2012 January 2019 were included. modified Rankin Scale (mRS) scores at 90-day long-term follow-up...

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTDependence of Photonic Crystal Nanocomposite Elasticity on Crystalline Colloidal Array Particle SizeMichelle M. Ward Muscatello, Lee E. Stunja, Prachi Thareja, Luling Wang, Justin J. Bohn, Sachin S. Velankar, and Sanford A. Asher*View Author Information† Department Chemistry‡ Chemical Petroleum Engineering University Pittsburgh, Pennsylvania 15260*Corresponding author: Ph 412-624-8570, Fax 412-624-0588;...

The semiconductor industry is continually driven to improve chip performance by further miniaturization of devices process, materials, and integration innovations. Earlier materials innovations included the introduction copper (Cu), replacing aluminum as conductive material in interconnect structure, use tantalum (Ta) (adhesion)/tantalum nitride (TaN) (barrier) separate Cu from non-conductive/insulator dielectric material. However, with progressive shrinkage real estate, at most advanced...

We developed a facile method to fabricate deep ultraviolet (UV) photonic crystal crystalline colloidal array (CCA) Bragg diffraction devices. The CCAs were prepared through the self-assembly of small, monodisperse, highly surface charged silica particles (~50 nm diameter) that synthesized by using modified Stöber process. particle surfaces functionalizing them with strong acid, non-UV absorbing silane coupling agent 3-(trihydroxylsilyl)-1-propane-sulfonic acid (THOPS). These charged,...

We examined photochemical degradation of energetic molecules upon UV resonance Raman (UVRR) excitation the 229 nm UVRR spectra solid HMX, TNT and RDX. Comparisons these photodegraded samples to those different carbon indicate some features similar compounds with sp² bonding, vaguely reminiscent graphitic as well amorphous carbon. Spinning material minimizes per molecule photon flux which decreases photochemistry. very roughly estimated quantum yields <10^-6.

Introduction: This study aimed to screen for oxidative stress-related genes (OSRGs) and build an signature predict the prognosis of liver cancer. Methods: OSRGs with a protein domain correlation score ≥ 6 were downloaded from GeneCards database intersected The Cancer Genome Atlas (TCGA) data subsequent analyses. Differential immune cells (DICs) stromal scores between normal tumor samples determined, followed by unsupervised hierarchical cluster analysis. Immune-related identified using...