Papers – Page 78 – TechConnect Briefs

Dynamics of intermediate to late stage concentration fluctuations during free diffusion experiments

Oprisan A., Oprisan S.A., Oprisan A., Oprisan S.A., Teklu A., College of Charleston, US

Two experiments were performed using shadowgraph visualization technique in order to study the dynamics of concentration fluctuations. Our experimental setup includes an objective attached to the CCD camera to increase the field of view. Using [...]

High resolution imaging of biological materials using hydrophobic carbon nanotube AFM probes

Lee J-H., Najeeb C.K., Chang J., Kang W-S, Nam G-H, Kim J.H., Ajou University, KR

Carbon nanotube (CNT) tipped atomic force microscope (AFM) probes have shown a significant potential for obtaining high resolution imaging of nanostructure and biological materials. In this work, we report a simple method to fabricate single-walled [...]

Structural Elucidation of Doxorubicin-Loaded Liposomes by Atomic Force Microscopy in air and water

Tian B.W., Al-Jamal W.T., Stuartb M., Kostarelos K., The School of Pharmacy, University of London, UK

Doxil is a clinically used, FDA-approved liposomal product against cancer. Structural elucidation of liposomal doxorubicin by cryogenic-transmission electron microscopy (cryo-EM) showed that doxorubicin (Dox)form crystal-like structures inside liposomes. Since 1992, cryo-EM has been the only [...]

Effect of local curvature on the interaction between hydrophobic surfaces

Hansson P., Swerin A., Thormann E., Claesson P.M., Schoelkopf J., Gane P.A.C., YKI, Institute for surface chemistry, SE

Previous measurements of the attractive interaction between hydrophobic macroscopic surfaces have showed that long-range forces that are considerably stronger than the van der Waals force dominate the interaction Silica nanoparticles have been deposited on substrates [...]

Size distribution determination of nanoparticles and nanosized pores by small-angle X-Ray scattering on a multi-purpose X-ray diffractometer platform

Bolze J., Rekhi S., Macchiarola K., Litteer B., PANalytical B.V., NL

We present the small-angle X-ray scattering (SAXS) technique for the investigation of crystalline and amorphous materials on a mesoscopic length scale ranging from ca. 1 - 100 nm. Dry powders or dispersions of inorganic and [...]

Enhanced ferromagnetism and weak polarization of multiferroic BiFeO3 synthesized by sol-gel auto-combustion method

Wang G.M., Xu J.M., Zhang D., China University of Geosciences, CN

BiFeO3 nanoparticles and ceramics were prepared by sol-gel auto-combustion method. Optimal conditions for the synthesis of pure BiFeO3 nanoparticles were experimentally obtained by X-ray diffraction patterns analysis. Scanning electronic microscope was used to investigate microstructure [...]

Nano-scale TEM studies of the passive film and the chloride-induced depassivation of carbon steel in concrete

Ghods P., Isgor O.B., Li J., Carpenter G., McRae G., Gu G.P., Carleton University, CA

In the highly alkaline environment of concrete, carbon steel rebar is protected against corrosion by a passive iron oxide film. The partial or complete loss of the protective oxide film, known as depassivation, leads increased [...]

Intense room-temperature photoluminescence of crystalline β-Ta2O5 nanobrick arrays

Ma Y-R, Lin J-H, Ho W-D, Devan R.S., National Dong-Hwa University, TW

In this study we analyzed the structural, electronic, and photoluminescence (PL) properties of a new morphological form, stacking Ta2O5 nanobrick arrays that were synthesized by hot filament metal-oxide vapor deposition. Field-emission scanning electron microscopy (FESEM) [...]

Conformation of pH Responsive Alternating Copolymers and Self-Assembly in Nanoarchitectures

Chan A.S.W., Groves M., Malardier-Jugroot C., Royal Military College of Canada, CA

Our research focuses on the characterization of the association and the properties in aqueous solution of nanostructures composed of amphiphilic alternating copolymers. These copolymers are composed of a pH sensitive hydrophilic group, maleic anhydride alternating [...]

Size and Count of Nanoparticles by Scattering and Fluorescence Nanoparticle Tracking Analysis (NTA)

Griffiths D., Hole P., Smith J., Malloy A., Carr B., NanoSight, US

A novel addition to a technique for the analysis of nanoparticles in a suspension is described. The Nanoparticle Tracking Analysis (NTA) technique sizes individual nanoparticles, based on their Brownian motion. Unlike classical light scattering techniques, [...]