The bio barcode silica nanotubes (SNTs) was developed to detect pathogenic bacteria using quantum dots and beacon-type capture probe. Various quantum dots were embedded in SNT (QD-SNT) to generate a barcoding signal with different colors and orders. The QD-SNT was coated by colloidal gold nanoparticle to immobilize hairpin structured capture probe on outer walls. Pathogenic specific capture pro...

We report about a new type of nonlinear photonic crystal fibers allowing broadband four-wave mixing and supercontinuum generation. The microstructured optical fiber has a structured core consisting of a rod of highly nonlinear glass material inserted in a silica tube. This particular structure enables four wave mixing processes with very large frequency detuning (>135 THz), which permitted the ...

We have developed a simple and scalable bottom-up approach for fabricating moth-eye antireflective coatings on GaAs substrates. Monolayer, non-close-packed silica colloidal crystals are created on crystalline GaAs wafers by a spin-coating-based single-layer reduction technique. These colloidal monolayers can be used as etching masks during a BCl(3) dry-etch process to generate subwavelength-str...

OBJECTIVE Few studies have systematically investigated the impact of past occupational dust exposure on mental health. We examined whether retired factory workers exposed to any of the 4 dusts of silica, cement, coal and asbestos had more depressive symptoms and anxiety in southern China, which has experienced rapid economic development. METHODS We used data from the Guangzhou Biobank Cohort ...

The high-pressure phase diagram of SiO2 has been calculated using density-functional perturbation theory. We find that phase transitions of silica do not correspond to any observed seismic discontinuities within the Earth. We analyze the breakdown of close packing occurring in SiO2 above 200 GPa and conclude that it is due to asphericity and deformability of ions, which can generally lead to th...

Abstract In this work, a series of silica glass photonic crystal fibers (PCFs) were designed through implementation numerical method [1] based on an experimental model that allows the calculation chromatic dispersion from two structural parameters PCFs. Then, PCFs fabricated by stretching structured preform using calculated preliminary design. Some characterization techniques implemented with a...

Hyperbranched polyimide–silica hybrids (HBPI–silica HBDs) and hyperbranched polyimide–silica composites (HBPI–silica CPTs) were prepared, and their general and gas transport properties were investigated to clarify the effect of silica sources and preparation methods. HBPI–silica HBDs and HBPI–silica CPTs were synthesized by two-step polymerization of A2 + B3 monomer system via polyamic acid as ...

Silica scaling potential from geothermal waters puts limits on to what extent the heat from the water can be extracted. Once the waters become over-saturated with respect to amorphous silica, the handling of such waters becomes problematic. Many methods have been proposed to address this problem. One of them is aging the geothermal waste water allowing monomeric silica in excess of amorphous si...