We report here results of a single-cell Raman spectroscopy study of stress effects induced by silver nanoparticles in human mesenchymal stem cells (hMSCs). A high-sensitivity, high-resolution Raman Tweezers set-up has been used to monitor nanoparticle-induced biochemical changes in optically-trapped single cells. Our micro-Raman spectroscopic study reveals that hMSCs treated with silver nanopar...

Layer-by-layer (LBL) technique is a well-established method for the formation of nanofilms on planar surfaces, as well as on micro-sized colloidal particles. For surface functionalization of nanoparticles, it is a very recent area of research receiving great interest due to the advantage of obtaining fine control over the shell composition, charge and thickness, offering several applications in...

This paper reports an "all in one" procedure to produce mesoporous, micro-spherical LiFePO₄ composed of agglomerated crystalline nanoparticles. Each nanoparticle is individually coated with a thin glucose-derived carbon layer. The main advantage of the as-synthesized materials is their good performance at high charge-discharge rates. The nanoparticles and the mesoporosity guarantee a short bulk...

Polyaniline nanoparticles were prepared using oxidation polymerization in micro-emulsion system. Sodium dodecyl sulphate was used as a surfactant which dissolved in hydrochloric acid giving the micellar solution. Potassium persulphate was used as an oxidant. The produced particles were spherical in shape with an average diameter of 15 nm as detected from the transmittance electron microscope im...

Poly(ethylene glycol) dimethacrylate (PEGDMA) and methacrylic acid (MAA) based micro and nanoparticles were prepared for oral insulin delivery. The reactional profiles of MAA, PEGDMA and PEGDMA-MAA were elucidated using molecular mechanics energy relationships (MMER) in vacuum and in a solvated system by exploring the spatial disposition of different concentrations of polymers with respect to e...

Diatoms are single-celled algaes that make photonic-crystal-like silica shells or frustules with hierarchical micro& nano-scale features consisting of two-dimensional periodic pores. In this paper, we present an innovative label-free optical sensor based on a biological-plasmonic hybrid nanostructure by self-assembling silver (Ag) nanoparticles into diatom frustules. The photonic-crystal-like d...

We have studied the dynamic behavior of nanoparticles in ferrofluids consisting of single-domain, biogenic magnetite (Fe(3)O(4)) isolated from Magnetospirillum magnetotacticum (MS-1). Although dipolar chains form in magnetic colloids in zero applied field, when dried upon substrates, the solvent front disorders nanoparticle aggregation. Using avidin-biotin functionalization of the particles and...

Obtaining a tiny focal spot is desired for super resolution. We do vectorial numerical analysis of the linearly, circularly, and radidally polarized electromagnetic fields being focused through dielectric micro/nanoparticle size comparable to wavelength. find spots (up ∼ 0.05 <...

Gold-gelatin bionanocomposite films are prepared by the reduction of gold ions by sodium borohydride in an aqueous solution. It is shown that both the solution and the films on glass substrates contain entrapped hydrogen micro- and nanobubbles with diameters in the range of 200 nm-3 μm. The optical properties of gold nanoparticles in the presence of gelatin and hydrogen nanobubbles are measured...