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ZrB2–SiC–G Composite Prepared by Spark Plasma Sintering of In-Situ Synthesized ZrB2–SiC–C Composite
2018-06-12
To avoid introduction of milling media during ball-milling process and ensure uniform distribution of SiC and graphite in ZrB2 matrix, ultrafine ZrB2–SiC–C composite powders were in-situ synthesized using inorganic–organic hybrid precursors of Zr(OPr)4, Si(OC2H5)4, H3BO3, and excessive C6H14O6 as source of zirconium, silicon, boron, and carbon, respectively. To inhabit grain growth, the ZrB2–SiC–C composite powders were densified by spark plasma sintering (SPS) at 1950°C for 10 min with the heat
Bioenabled SERS Substrates for Food Safety and Drinking Water Monitoring
2018-06-12
We present low-cost bioenabled surface-enhanced Raman scattering (SERS) substrates that can be massively produced in sustainable and eco-friendly methods with significant commercial potentials for the detection of food contamination and drinking water pollution. The sensors are based on diatom frustules with integrated plasmonic nanoparticles.
Ion beam induced cubic to monoclinic phase transformation of nanocrystalline yttria
2018-06-12
Sol gel derived nanocrystalline yttria pellets are irradiated with 120 MeV Ag9+ ions for fluence in the range 1 1012–3 1013 ions cm 2. Pristine and irradiated samples are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and Raman spectroscopy. XRD pattern of pristine Y2O3 nanocrystal reveal cubic structure. A new XRD peak at 30.36 is observed in pellet irradiated with 1 1013 ions cm 2. The peak at 30.36 is corresponding to ?40 2? plane of monoclinic phase.