Publications by authors named "B Reinhard"
Article Synopsis
- Noble metal nanoparticles (NPs), specifically 20 nm silver NPs, can generate heat and create temperature gradients when bound to a thin gold film, acting as both heat sources and optical sensors.
- These temperature gradients produce thermophoretic forces that can manipulate the position of the NPs, affecting their equilibrium and leading to observable changes in their scattering signals.
- Experimental results show a consistent decrease in the scattering signal of the NPs, indicating they are being drawn closer to the film due to the attractive forces generated by the temperature gradient, with power densities applied ranging from 1.40 to 4.80 kW/cm.
In a recent study, spectroscopic observations of modified cholesterol in both lipid-coated nanoparticles and liposomes provided evidence for a disorder-to-order orientational transition with increasing temperature. Below a critical temperature, in a membrane composed of modified cholesterol, saturated (DPPC) lipid, and anionic (DOPS) lipid, a roughly equal population of head-out and head-in conformations was observed. Surprisingly, as temperature was increased the modified cholesterol presented an abrupt transition to a population of all head-in orientations.
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- The study focuses on hybrid nanomaterials made from silver nanoparticles (AgNPs) and chalcopyrite (CuFeS) nanocrystals, aiming to improve charge and energy transfer for enhanced photoconversion and photocatalysis.
- The AgNP@CuFeS hybrid structure features CuFeS nanocrystals embedded in a lipid coating around the AgNP core, which supports quasistatic resonances that facilitate energy transfer.
- Experiments reveal that optimal energy transfer occurs when the resonances of AgNPs and CuFeS NCs align, enhancing the generation of reactive charge carriers, critical for photocatalytic applications.
Plasmonic molecules are discrete assemblies of noble metal nanoparticles (NPs) that are of interest as transducers in optical nanosensors. So far, NPs with diameters of ∼40 nm have been the preferred building blocks for plasmonic molecules intended as optical single molecule sensors due to difficulties associated with detecting smaller NPs through elastic scattering in conventional darkfield microscopy. Here, we apply 405 nm, 445 nm two-color interferometric scattering (iSCAT) microscopy to characterize polyethylene glycol (PEG) tethered dimers of 10 nm and 20 nm Ag NPs and their monomers.
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