Amorphous sulfur was prepared by rapid compression of liquid at temperatures above the λ-transition for to preserve high-temperature structure. We conducted synchrotron high-energy X-ray diffraction and Raman spectroscopy diagnose structural evolution amorphous from room temperature post-λ-transition temperature. Discontinuous changes first second peaks in atomic pair-distribution-function, g(r), were observed during transition sulfur. The average first-neighbor coordination numbers showed...

This study was designed to compare optical biometry measurements and predicted refraction in cataract patients with high myopia [axial length (AL) ≥26 mm] using OA-2000 IOL Master 500. Ocular were performed both biometers before surgery. Uneventful surgery all patients. Postoperative manifest obtained 3wk after or later. A total of 67 eyes examined. The AL, keratometry (K), anterior chamber depth (ACD) the two showed excellent agreement. Predicted errors similar a strong positive correlation...

A hallmark of nanoscience is size-dependent and distance-dependent physical properties. Although most previous studies focused on optical properties, which are often tuned at nanometer scale, we herein report the interaction between halide-capped gold nanoparticles (AuNPs) phosphocholine (PC) liposomes sub-Angstrom level. Halide-capped AuNPs adsorbed by PC attributable to van der Waals force. Iodide-capped interact much more weakly with compared bromide- chloride-capped AuNPs, as indicated a...

The morphology of ZSM-5 zeolite impacts the adsorption, separation and diffusion molecules. textural properties zeolites were adjusted by regulating content ethanol in synthesis gel. When ratio ethanol/SiO2 was lower than 2, obtained crystals isolated particles. With higher concentration, chainlike generated due to condensation terminal Si-OH groups. stacked more compactly with increase resulting decreased specific surface area, total volume mesoporous volume. crystal size increased...

High-pressure crystallized poly (ether ether ketone) (PEEK) samples were prepared with a piston-cylinder apparatus by varying temperature, pressure, crystallization time, and molecular weight, investigated using wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), electron microscopy (SEM). The applied etching experiments showed that the chemical resistance of polymer was significantly improved through high-pressure treatment. results also revealed PEEK spherulites...

In situ high-energy X-ray diffraction of Nd60Fe30Al10 and Ce70Al10Cu20 metallic glasses is carried out under high pressure. During compression, exhibit a polyamorphic transition from low-density state below 2.0 10.0 GPa, to high-density above 8.4 21.1 respectively. The intermediate hysteresis regions are the mixture both phases. Electrical resistance measurements pressure show that display discontinuous change in dependence curve resistivity at around 1.7 GPa. addition Fe atom gives...

Abstract Fe/ZSM-5 catalysts were prepared by three kinds of ion exchange methods: aqueous ion-exchange (AI), hydrothermal (HI) and solid-state (SI). Their catalytic activities tested for NOx reduction CO in a separated adsorption-desorption process. In this paper, performances adsorption, dynamic adsorption-reduction all investigated. All exhibited good activity at above 300 °C. Fe/ZSM-5(SI) excellent removal efficiency the experiments. However, process adsorption Fe/ZSM-5(AI) Fe/ZSM-5(HI)...

Using the technology of pressure jump, variations temperature associated with from 2.4 GPa to 4.6 are measured for lead. The Grüneisen parameter is calculated thermodynamic relation γ = (Ks/T)(∂T/∂P)s, in which substitution ΔT/ΔP ∂T/∂P at median strictly justified. correction change carried out by analysing experimental data, makes process more approaching an adiabatic condition. values and gradually decrease increasing pressure. trend consistent previous work. range 2–3 averagely higher...

Melt of Nd60Cu20Ni10Al10 alloy is solidified by rapid compression from 0.1 to 5.5 GPa at 793K and 3.2 873K within 20 ms, separately. A fully bulk metallic glass obtained the method. By comparing with as-cast (BMG), it found that BMG prepared exhibits a higher thermodynamic stability paramagnetic property. The relationship between glass-formation temperature pressure in for demonstrated P – T phase diagram.

By using a self-designed pressure-jump apparatus, we investigated the melt solidification behavior in rapid compression process for poly-ethylene-terephthalate (PET), polyether-ether-ketone (PEEK), isotactic polypropylene (iPP), high-density polyethylene (HDPE), and living polymer sulfur. The experimental results clearly show that crystallization could be inhibited, some melts were solidified to full amorphous state PET, PEEK, Full PEEK was 24 mm diameter 12 height prepared, which exceeded...

Abstract Coal-fired power plants are undergoing ultra-low emission retrofits. When the flue structure of SCR denitrification system existing unit is fixed, internal baffles and static mixers need to be optimized ensure flow field uniformity, thus ensuring efficiency controlling ammonia escape rate. For a 660 MW system, numerical simulation gas uniformity cold state test physical model were carried out. The results show that distribution mixing effect in effectively improved by adding...

A normal melting process is endothermic and causes volume expansion. Exothermic or contraction therefore abnormal, has important effects in condensed-matter physics. In the present study, we investigated mechanism of abnormal exothermic amorphous sulfur. Analysis Raman spectra obtained before after showed that sulfur contains clusters form polymeric chains. After melting, S₈ predominate, i.e., chains are converted to rings during which affects overall internal energy system....

The melt's solidification behavior of elemental selenium is investigated by a series experiments including rapid compressing to 2.8 and 3.5 GPa within 20ms respectively, slow for 20 min natural cooling at ambient pressure. Based on the x-ray diffraction, scanning electron microscope transmission results recovered samples, it clearly shown that homogenous nanostructures are formed only compression processes, average crystal sizes about 18.7 19.0 nm in samples from GPa, respectively. relative...

By using a self-designed pressure-jump apparatus, we investigated the melt solidification behavior in rapid compression process for several kinds of materials, such as elementary sulfur, polymer polyether-ether-ketone (PEEK) and poly-ethylene-terephthalate, alloy La68Al10Cu20Co2 Nd60Cu20Ni10Al10. Experimental results clearly show that their melts could be solidified to amorphous states through process. Bulk PEEK with 24 mm diameter 12 height was prepared, which exceeds size obtained by...

Mg2Ge with anti-fluorite structure at ambient pressure is characterized as a narrow band semiconductor and increasing results in decrease of the gap. In this work, under high studied by first principles calculations, which suggests that becomes metallic 7.5 GPa result gap closure. The enthalpy difference between phase anti-cotunnite calculated first-principles plane-wave method within pseudopotential generalized gradient approximation. show undergoes transition from to 11.0 GPa. Then we...

Two kinds of glassy sulfurs are synthesized by the rapid compression method from liquid sulfur at temperatures below and above λ -transition point. The has different colors transparencies, depending on temperature, which may inherit some structural information -transition. Raman spectrum studies these samples show that a large fraction polymeric chains exist in sulfur, even one solidified T < . We find higher rate instead temperature parent captures more chains. Pressure-induced presents...

Bridgman anvil is a useful and effective tool in high-pressure research. However, this apparatus, the pressure distribution essentially centrosymmetric. Thus, considerable gradients exist gasket sample chamber respectively, uniform area limited. To improve uniformity flat face supported anvils, we design strip instead of conventional round adopt an assortive gasket. Principle analysis series calibration experiments are also presented paper.The construction relevant parts apparatus shown...

The W-J equation of state proposed by Wu qiang and Jing fu-qian is a volume with pressure temperature as the independent variables, which mutually complementary to Grneisen state, extending perfecting in theory state. It significant determine parameters for study application equation. can be educed from adiabatic bulk modulus, but it difficult take into account uncertainty these parameters. In this paper we explore method direct measurement Temperature were recorded situ during rapid...