The Experts below are selected from a list of 12516 Experts worldwide ranked by ideXlab platform
N Chandrasekaran - One of the best experts on this subject based on the ideXlab platform.
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Haemocompatibility assessment of synthesised Platinum Nanoparticles and its implication in biology
Bioprocess and Biosystems Engineering, 2014Co-Authors: P. J. Shiny, Amitava Mukherjee, N ChandrasekaranAbstract:The growing need for advanced treatment of evolving diseases has become a motivation for this study. Among the noble metals, Platinum Nanoparticles are of importance because of their catalytic property, antioxidant potential, minimal toxicity and diverse applications. Biological process of synthesis has retained its significance, because it is a simple one-step process yielding stable Nanoparticles. Herein, we have synthesised Platinum Nanoparticles through a green process using the unexplored seaweed Padina gymnospora , a brown alga. The course of synthesis was monitored and the Nanoparticles were characterised using UV–visible spectroscopy. The synthesised Nanoparticles were studied using TEM, XRD and FTIR. The TEM and XRD studies reveal the size of the nanoparticle to be
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Comparative assessment of the phytotoxicity of silver and Platinum Nanoparticles
International Conference on Advanced Nanomaterials & Emerging Engineering Technologies, 2013Co-Authors: Shiny Pj, Amitava Mukerjee, N ChandrasekaranAbstract:From electronics such as nanodevices, nanochips to the use of Nanoparticles in medicine, nanotechnology has developed rapidly due to the advancement in the field of nanoscience. Therefore, these Nanoparticles are widely used in many industries and consumer products. Beneficial silver and Platinum Nanoparticles have been considered for our study. The toxicity of the silver and Platinum Nanoparticles was assessed on the representative seed systems Solanum lycopersicum (tomato) and Raphanus sativus (radish). The Platinum nanoparticle which is said to be nontoxic was subjected to the toxicity testing. The Nanoparticles employed in this study were produced by an ecofriendly green synthesis method.
Gabor A. Somorjai - One of the best experts on this subject based on the ideXlab platform.
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Novel Two-Step Synthesis of Controlled Size and Shape Platinum Nanoparticles Encapsulated in Mesoporous Silica
Catalysis Letters, 2002Co-Authors: Zoltán Kónya, Victor F. Puntes, Imre Kiricsi, Paul Alivisatos, Gabor A. SomorjaiAbstract:Uniform shape and size Platinum Nanoparticles encapsulated in mesoporous silica (SBA-15) were prepared in the same solution by a novel two-step method. Platinum Nanoparticles were prepared in aqueous solution of K_2PtCl_4, the reduction was carried out by bubbling hydrogen, the capping material was tri-block poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) copolymer. The mesoporous silica was synthesized using the same copolymer as template from tetraethyl orthosilicate by hydrolysis in acidic conditions. The “Pt-Nanoparticles-in-mesoporous-silica” system was characterized by a combination of low-angle powder X-ray diffraction, transmission electron microscopy and N_2 porosimetry. The Platinum Nanoparticles are encapsulated in the mesopores and retained their size and morphology. It appears that this hybrid material should be a superior three-dimensional high-surface-area catalyst for selective Platinum-catalyzed reactions.
Jae Hee Shim - One of the best experts on this subject based on the ideXlab platform.
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Platinum Nanoparticles prepared by a plasma chemical reduction method
Journal of Materials Chemistry, 2005Co-Authors: Jae Hee ShimAbstract:Platinum Nanoparticles were prepared by reducing H2PtCl6 dissolved in water with the help of hydrogen plasma generated right above the aqueous solution, thus the small surface area of the solution contacting the plasma becomes the active reaction zone. This simple method to fabricate the Nanoparticles did not necessitate use of reducing agents and polymer protective materials. The average particle size was around 2 nm with the solution temperature set at 10 °C.
Suresh Valiyaveettil - One of the best experts on this subject based on the ideXlab platform.
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comparison of the toxicity of silver gold and Platinum Nanoparticles in developing zebrafish embryos
Nanotoxicology, 2011Co-Authors: P V Asharani, Yi Lianwu, Zhiyuan Gong, Suresh ValiyaveettilAbstract:AbstractNanoparticles have diverse applications in electronics, medical devices, therapeutic agents and cosmetics. While the commercialization of Nanoparticles is rapidly expanding, their health and environmental impact is not well understood. Toxicity assays of silver, gold, and Platinum Nanoparticles, using zebrafish embryos to study their developmental effects were carried out. Gold (Au-NP, 15–35 nm), silver (Ag-NP, 5–35 nm) and Platinum Nanoparticles (Pt-NP, 3–10 nm) were synthesized using polyvinyl alcohol (PVA) as a capping agent. Toxicity was recorded in terms of mortality, hatching delay, phenotypic defects and metal accumulation. The addition of Ag-NP resulted in a concentration-dependant increase in mortality rate. Both Ag-NP and Pt-NP induced hatching delays, as well as a concentration dependant drop in heart rate, touch response and axis curvatures. Ag-NP also induced other significant phenotypic changes including pericardial effusion, abnormal cardiac morphology, circulatory defects and absen...
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Active targeting of cancer cells using folic acid-conjugated Platinum Nanoparticles
Nanoscale, 2010Co-Authors: Yiwei Teow, Suresh ValiyaveettilAbstract:Interaction of Nanoparticles with human cells is an interesting topic for understanding toxicity and developing potential drug candidates. Water soluble Platinum Nanoparticles were synthesized via reduction of hexachloroplatinic acid using sodium borohydride in the presence of capping agents. The bioactivity of folic acid and poly(vinyl pyrrolidone) capped Platinum Nanoparticles (Pt-nps) has been investigated using commercially available cell lines. In the cell viability experiments, PVP-capped Nanoparticles were found to be less toxic (>80% viability), whereas, folic acid-capped Platinum Nanoparticles showed a reduced viability down to 24% after 72 h of exposure at a concentration of 100 μg ml−1 for MCF7 breast cancer cells. Such toxicity, combined with the possibility to incorporate functional organic molecules as capping agents, can be used for developing new drug candidates.
D Demberelnyamba - One of the best experts on this subject based on the ideXlab platform.
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size selective synthesis of gold and Platinum Nanoparticles using novel thiol functionalized ionic liquids
Langmuir, 2004Co-Authors: D DemberelnyambaAbstract:One-phase synthesis of gold and Platinum Nanoparticles using new thiol-functionalized ionic liquids (TFILs) is described for the first time. TFILs as stabilizing agents for gold and Platinum Nanoparticles were designed to have thiol groups on either the cation or anion and symmetrical or unsymmetrical positions only in the cation. Transmission electron microscopy, electron diffraction, and NMR were used for the characterization of Nanoparticles. The metal Nanoparticles formed using TFILs are crystalline structures with face-centered cubic packing arrangements and have small sizes (the average diameters are 3.5, 3.1, and 2.0 nm for Au and 3.2, 2.2, and 2.0 nm for Pt, respectively) and uniform distributions (the standard deviations are 0.7, 0.5, and 0.1 nm for Au and 1.1, 0.2, and 0.1 for Pt, respectively). It is believed that the nanoparticle size and distribution depend on the number and position of thiol groups in the IL.