In this study, gold nanocubes (AuNCs) were quickly synthesized using the seed-mediated growth method and reduced onto the surface of two-dimensional (2D) delaminated nano mica platelets (NMPs), enabling the developmen...
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In this study, gold nanocubes (AuNCs) were quickly synthesized using the seed-mediated growth method and reduced onto the surface of two-dimensional (2D) delaminated nano mica platelets (NMPs), enabling the development of AuNCs/NMPs nanohybrids with a 3D lightning-rod effect. First, the growth-solution amount can be changed to easily adjust the AuNCs average-particle size within a range of 30-70 nm. The use of the cationic surfactant cetyltrimethylammonium chloride as a protective agent allowed the surface of AuNCs and nanohybrids to be positively charged. Positively charged nanohybrid surfaces presented a good adsorption effect for detecting molecules with negative charges on the surface. Additionally, the NMP surfaces were rich in ionic charges and provided a large specific surface area for stabilizing the growth of AuNCs. Delaminated AuNCs/NMPs nanohybrids can generate a 3D hotspot effect through self-assembly to enhance the Raman signal. Surface-enhanced Raman scattering (SERS) is highly sensitive in detecting adenine biomolecules. Its limit of detection (LOD) and Raman enhancement factor reached 10−9 M and 3.6 × 108, respectively. Excellent reproducibility was obtained owing to the relatively regular arrangement of AuNC particles, and the relative standard deviation (RSD) was 10.7%. Finally, the surface of NMPs was modified by adding the hydrophilic poly(oxyethylene)-diamine (POE2000) and amphiphilic PIB-POE-PIB copolymer at different weight ratios. The adjustment of the surface hydrophilicity and hydrophobicity of AuNCs/NMPs nanohybrids led to better adsorption and selectivity for bacteria. AuNCs/POE/NMPs and AuNCs/PIB-POE-PIB/NMPs were further applied to the SERS detection of hydrophilic Staphylococcus aureus and hydrophobic Escherichia coli, respectively. The SERS-detection results suggest that the LOD of hydrophilic Staphylococcus aureus and hydrophobic Escherichia coli reached 92 CFU mL−1 and 1.6 × 102 CFU mL−1, respectively. The AuNCs/POE/NMPs and AuNCs/P
We report memristor behavior in bar shaped single crystals of titania that have been "formed" into electronic conductors. The cycling experiments are carried out with forward and reverse current, rather than...
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This study involves synthesis and characterizations of soy flour ash, an environmentally beneficial and low-cost adsorbent, prepared in the muffle furnace by heating soy flour at 450 and 600 °C without pre/p...
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We delineate the structure of steady laminar flows within a stably stratified, valley-shaped triangular cavity heated from below through linear stability analysis and Navier-Stokes simulations. Our formulation follows...
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We delineate the structure of steady laminar flows within a stably stratified, valley-shaped triangular cavity heated from below through linear stability analysis and Navier-Stokes simulations. Our formulation follows Prandtl's idealization of mountain and valley flows. We derive an exact solution to the quiescent conduction state, which bifurcates to two pairs of flow patterns with symmetric and asymmetric circulations in the valley-shaped enclosure. We characterize the flow via the stratification perturbation parameter, Πs, which is a measure of the strength of the surface heat flux relative to the strength of the background stable stratification, while keeping other dimensionless parameters fixed. At very low Πs values, the pure conduction state remains stable. Beyond a threshold value of Πs, a unique bifurcation event transpires, giving rise to two discernible types of eigenmodes. One type is marked by a single dominant circulation positioned at the valley's center, while the other one exhibits dual circulations of equal strength within the same central valley region. Notably, the critical value associated with the central-circulation eigenmode is marginally lower than that of the dual-circulation eigenmode. Through three-dimensional Navier-Stokes simulations, we confirm that the central-circulation eigenmode generates a pair of asymmetric steady states, whereas the dual-circulation eigenmode leads to distinct upslope and downslope symmetric convection patterns. Linear stability analysis and three-dimensional Navier-Stokes simulations jointly confirm the linear instability of the two dual-circulation states, indicating that the slightest asymmetric perturbation will induce a transition towards the asymmetric steady state, which is the primary state for the parameter values considered here. Overall, our investigation reveals that, for a given set of dimensionless parameters, the Navier-Stokes equations admit at least five possible steady-state solutions. Two of t
We report that circularly polarized terahertz light pulses can drive chiral phonons, which then induce an effective quasi-static magnetic field on the order of 1 tesla to polarize the paramagnetic cerium fluoride. ...
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Tropical and subtropical climates are the dominant growing environments for water hyacinth plants. Aquatic plants that float on the surface of the water. This substance occurs naturally in most of Tamil Nadu's pon...
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The formation of balling,porosity and cracking defects is a vital obstacle in selective laser melting of wrought Al ***,it lacks systematic research on the origins of these ***,the formation mechanisms and avoidance m...
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The formation of balling,porosity and cracking defects is a vital obstacle in selective laser melting of wrought Al ***,it lacks systematic research on the origins of these ***,the formation mechanisms and avoidance methods of metallurgical defects in slective laser melting(SLM)-processed Al-Cu-Mg alloy were investigated by numerical simulation and microstructure *** optimization by altering laser energy density can effectively suppress balling and porosity,thus enhancing relative *** results from the stress concentration and columnar grains arise due to the rapid cooling process during *** methods that promote the columnar-to-equiaxed grain transition,such as microalloying by Sc/Zr/Ti elements,co-incorporation of ceramic particles and introducing ultrasound,can effectively enhance the cracking resistance and mechanical properties of wrought Al alloys.
Subsea templates are steel structures used to support subsea well compo***,offshore crane vessels are employed to install them to the target location on the *** the splash-zone during the lowering of a subsea te...
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Subsea templates are steel structures used to support subsea well compo***,offshore crane vessels are employed to install them to the target location on the *** the splash-zone during the lowering of a subsea template is considered the most critical phase during the installation due to slamming loads and needs to be studied to provide the operational weather criterion during the planning *** this study,dynamic response analysis has been carried out to evaluate the allowable sea states for the plash-zone crossing phase of the subsea *** numerical model of the lifting system,including the crane vessel and the subsea template,is firstly built in the state-of-the-art numerical program ***,dynamic analysis with time-domain simulations is carried out for the lifting system under various sea *** disturbed wave field due to the shielding effects from the installation vessel is considered when calculating the hydrodynamic forces on the *** modelling of the dynamic responses from different wave realizations is used to estimate the extreme responses of various sea *** application of the generalized extreme value distribution and Gumbel distribution in fitting the extreme responses is ***,the influence of the shielding effects from the vessel,as well as the influence of the changing size of the suction anchor on the hydrodynamic responses and the allowable sea states are studied.
This study investigates clamped-free-clamped-free (CFCF) compliant aluminum alloy panels under hypersonic flow conditions. The goal is to enhance the understanding of Fluid-Structure Interaction (FSI) by computational...
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