Semicarbazide ELISA kit

In present study, pure and silver (Ag) doped nano-strontium apatite particles were produced by hydrothermal method at 180 degrees C for 12 h. The synthesized apatite particles structural characterization was carried out with X-Ray diffraction (XRD), Fourier transform infrared spectrometry (FT-IR), field emission scanning electron microscope (FE-SEM) and energy-dispersive X-ray spectrometry (EDS). The dielectrical properties of synthesized apatite particles were investigated in detail. The pure and Ag-doped strontium apatite particles were successfully synthesized by hydrothermal method. The diffraction peaks of (002) and (300) planes were shifted to lower 2 theta values with increasing the Ag doping ratio. The lattice parameters and volumes of unit cells were increased with increasing the Ag doping ratio. The size of the particles is in nanoscale range and nano-rod like form. The (Sr + Ag)/P atomic ratios of pure and 2%, 5%, 8%, 11% Ag doped particles were 1.74, 1.54, 1.70, 1.74 and 1.66, respectively. The dielectric constant values of pure strontium apatite particles were about 3 at 1 kHz and changed between about 2 to about 5 with Ag doping. The alternative conductivity of samples was increased with increasing frequency. The synthesized nano-strontium apatite particles can be used in orthopedic and dental applications as implant material. (C) 2020 Elsevier B.V. All rights reserved.

A series of aggregated nano-ZSM-5 with controlled crystal size (< 100 nm) were prepared via low temperature hydrothermal synthesis and utilized for the study of particle size effect of ZSM-5 on methanol to hydrocarbon (MTH) reaction for the first time. The textural and acidic properties of ZSM-5 at different crystal growth process were characterized and analyzed by N-2-sorption, XRD, NH3-TPD, TEM, SEM, TG, Py-IR and XPS. Two stages of crystal growth were found during the synthesis which could be used to guide the controlled synthesis of ultratiny nano-ZSM-5. According to catalytic performance, it was found that compared to external acid sites, internal acid sites play a crucial role on the synthesis of gasoline products. A positive relationship was found between the acidity and liquid hydrocarbon yield. In nanometer scale (< 100 nm) the crystal size and acidity of ZSM-5 still strongly influenced the catalytic performance and a balance existed between the crystal size control and acidity regulation for the catalytic stability. This work could attract more attention on the structure fine control of nanoscale ZSM-5 catalyst.