Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53697#.VM85jyzQrzE Author(s)    I. Medvedeva 1,2* , Iu. Bakhteeva 1 , S. Zhakov 1 , A. Revvo 2 , M. Uimin 1 , A. Yermakov 1 , I. Byzov 1 , A. Mysik 1 , N. Shchegoleva 1   Affiliation(s) 1 Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia . 2 Ural State Mining University, Ekaterinburg, Russia . ABSTRACT Sedimentation dynamics of magnetite ( γ -Fe 3 O 4 ) nanopowders (10 - 20 nm) in water in the presence of a gradient magnetic field was studied by optical and Nuclear Magnetic Resonance (NMR) relaxometry methods. The magnetic field B ≤ 0.3 T, dB/dz ≤ 0.13 T/cm was produced by the system of permanent strip magnets. The initial sedimentation rate of the nanoparticles in water and under magnetic fields is higher for less concentrated suspensions (c 0 = 0.1 g/l) than for more concentrated ones (c 0 = 1 g/l)....

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53523#.VMdF_yzQrzE Author(s)   Pratima Parashar Pandey *   Affiliation(s) Department of Materials Science, Mangalore University, Mangalagangotri, India . ABSTRACT Silver particulate thin films on softened polymer blends of Polystyrene (PS)/Poly(2-vinyl pyridine) (P2VP), PS/Poly(4-vinylpyridine) (P4VP), and Poly(vinylpyrollidone) (PVP)/P4VP at a rate of 0.4 nm/s held at a temperature of 457 K in vacuum of 8 × 10 -6 Torr by evaporation are deposited. These silver films were characterized by their electrical behavior, optical properties and Scanning electron microscopy (SEM). Silver films deposited on softened PS, and PVP give rise to a very high room temperature resistance approaching that of the substrate resistance due to the formation of a highly agglomerated structure. On the other hand, silver films on softened P2VP and P4VP gives rise to a room ...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53000#.VK9BqsnQrzE Author(s)   Diego J. S. Dias 1,2 , Graziella A. Joanitti 3 , Ricardo B. Azevedo 2 , Luciano P. Silva 4 , Claure N. Lunardi 1,3 , Anderson J. Gomes 1,3*   Affiliation(s) 1 School of Health Sciences, University of Brasilia, Brasilia, Brazil . 2 Institute of Biological Sciences, University of Brasilia, Brasilia, Brazil . 3 Laboratory of Nanobiotechnology, Faculty of Ceilandia, University of Brasilia, Brasilia, Brazil . 4 Laboratory of Mass Spectrometry, EMBRAPA, Genetic Resources and Biotechnology, Brasilia, Brazil . ABSTRACT The present work aimed to develop and evaluate a colloidal system composed of poly (DL-lactide-co-glycolide) (PLGA) nanoparticles (NPs) associated with chlorambucil (CHB) and its effects on cancer cells. The nanoparticles showed %EE (>92%), a mean particle size in the range of 240 to 334 nm and zeta potential of -16...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50665#.VEh-HVfHRK0 Author(s)   Tapio Vehmas , Ulla Kanerva , Erika Holt Affiliation(s) VTT Technical Research Centre of Finland, Espoo, Finland . ABSTRACT Nano-sized particles have got a focus of great interest for the past decade. These ultrafine particles can have an effect in multiple ways on concrete technology. Although most of the effects of nanoparticles are desired, a huge surface area introduced by nanoparticles also incorporates negative effects, such as loss of workability and safety aspects. Agglomeration of nano-sized particles by spray-drying is one potential method to overcome the negative effects. In this st...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50278#.VDNjSlfHRK0 Author(s)     Jayanta K. Sarmah 1* , Saibal Kanti Bhattacharjee 2 , Samhita Roy 3 , Ranadeep Mahanta 4 , Rita Mahanta 3 Affiliation(s) 1 School of Engineering and Technology, Kaziranga University, Jorhat, India . 2 Department of Chemistry, Gauhati University, Guwahati, India . 3 Department of Zoology, Cotton College, Guwahati, India . 4 Department of Biochemistry, Jorhat Medical College, Jorhat, India . ABSTRACT We prepared, characterized and studied the biodistribution of tamoxifen citrate (TMX) loaded cross-linked guar gum (GG) nanoparticles (NPs). NPs were prepared via a single step emulsion process and particle size evaluated....