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Green Nanotechnology from Plant Extracts: Synthesis and Characterization of Gold Nanoparticles

Advances in Nanoparticles 2016年第3期5卷 176-185页

作者： Adriana Napoleão Geraldes Andressa Alves da Silva Jessica Leal Gethzemani Mayeli Estrada-Villegas Nilton Lincopan Kattesh V. Katti ademar benévolo lugão Centro de Química e Meio Ambiente Instituto de Pesquisas Energéticas e Nucleares-Comiss&atildeo Nacional de Energia Nuclear (IPEN-CNEN) S&atilde o Paulo Brazil Centro de Química e Meio Ambiente Instituto de Pesquisas Energéticas e Nucleares-Comiss&atildeo Nacional de Energia Nuclear (IPEN-CNEN) S&atildeo Paulo Brazil Laboratório de Resistência Bacteriana & Alternativas Terapêuticas Instituto de Ciências Biomédicas S&atildeo Paulo Brazil Department of Radiology Physics Bio-Medical Sciences Nuclear Science and Engineering Institute University of Missouri-Columbia Columbia USA

The advantage of using plants in nanoparticles synthesis is that they are easily available, safe to handle and possess a broad variability of metabolites such as antioxidants, nucleotides and vitamins. The aim of this study was to investigate the effects of Green and Zimbro tea and also Green coconut water as a reducing and stabilizer agent in gold nanoparticle synthesis. The gold nanoparticles were characterized by UV-Vis absorption spectroscopy, X-ray diffraction (XRD), Dynamic light scattering (DLS) and Transmission electron microscopy (TEM) analysis. Their physical stability was determined using a UV-Vis spectrophotometer over several days during storage at room temperature. We observed that green chemical process to obtain gold nanoparticles did not require any external chemicals reagent for stabilization of nanoparticulate. Absorption measurements indicated that the plasmon resonance wavelength appears around 530 nm. X-ray diffracto-grams of gold nanoparticles evidenced the presence of Au-rich (fcc) phases. TEM analysis showed a homogeneous dispersion of nanoparticles and some agglomerates. Differences in size and shape of the nanoparticles were observed. Zeta potential of AuNPs synthetized in presence of Green tea was -33 mV indicating stability of the synthesized nanoparticles.

关键词： Green Nanotechnology Gold Nanoparticles Camellia sinensis Juniperus communis Green Coconut Water

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Introduction to Foamability Study of a LDPE Subjected to Gamma Radiation

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材料科学与工程（中英文B版） 2022年第2期12卷 71-74页

作者： Elizabeth C.L.Cardoso Sandra R.Scagliusi Duclerc F.Parra ademar B.lugão Centro de Química e Meio Ambiente Instituto de Pesquisas Energéticas e Nucleares(IPEN/CNEN)São Paulo 05508-000Brazil

Nowadays,polymer foams have a wide application area due to their light weight,emphasizing resistance to impact,high thermal insulation and damping properties,among ***,automotive,packing industry,electronic,aerospace,building construction,bedding and even medical applications are some of the fields where polymer foams are *** can be classified as open and closed:Closed-cell foam is provided with tiny and discrete pockets of gas,each one totally enclosed within polymer walls;open cell foam has tiny cells which are not completely *** this work,LDPE(low density polyethylene)resin foamability was investigated after exposure to ionizing radiation(gamma),at 5,10 and 15 *** included:melt flow index,melt strength and scanning electron microscopy.

关键词： LDPE foams melt strength gamma-radiation

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Poly(Vinyl Alcohol)(PVAl)and Poly(N-2-Vinyl-Pyrrolidone)Hydrogels Nanostructured by Laponite Clay for Drug Delivery

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材料科学与工程（中英文B版） 2022年第3期12卷 97-107页

作者： Maria José.A.Oliveira Vinicius J.Santos Lucas Freitas de Freitas ademar B.lugão Duclerc F.Parra Nuclear and Energy Research Institute-IPEN-CNEN/SP.Av.Professor Lineu Prestes 2242Cidade UniversitáriaSão Paulo 05508-000SPBrazil

Hydrogels for wound dressings are usually developed for contact surfaces where mechanical properties are conveniently *** this sense nanocomposite hydrogels based on PVAl(poly(vinyl alcohol))and PVP(poly(N-2-vinil-pirrolidone))containing 0.5-1.5 wt%of the synthetic laponite RD clay were prepared by a gamma radiation process and compared with similar membranes composed separately of PVP or *** study aimed to evaluate the effect of clay on the properties and the differences of the polymer blend instead of a unique *** morphology of the hydrogels was evaluated by spectrometric techniques using XRD(X-ray diffraction),SEM(scanning electron microscopy),swelling assay,and FTIR(infrared spectroscopy).The swelling kinetics at 22℃and the mechanical properties by a tensile test comprised the structural properties that were *** results showed PVA/PVP network depends directly on the clay concentration in the nanocomposite *** blend PVP/PVAl proved to have potentially efficient mechanical properties for drug delivery in the treatment of wounds.

关键词： Hydrogels clay nanocomposite drug delivery.

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