Advances in Natural Sciences: Nanoscience and Nanotechnology
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Characterization of the thin layer photocatalysts TiO2 and V2O5- and Fe2O3- doped TiO2 prepared by the sol–gel method
The catalysts TiO2 and TiO2 doped with Fe and V were prepared using the sol–gel method. TiO2-modified samples were obtained in the form of a thick film on pyrex glass sticks and tubes and were used as catalysts in the gas phase photo-oxidation of p-xylene. The physico-chemical characteristics of the catalysts were determined using the methods of Brunauer–Emmett–Teller adsorption, x......
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Electrospinning of doxorubicin loaded silica/poly(ɛ-caprolactone) hybrid fiber mats for sustained drug release
Loading of anticancer drugs into electrospun fiber matrices is a portentous approach for clinical treatment of diseased tissues or organs. In this study, doxorubicin hydrochloride (DOX) is added to silica nanoparticles (SiO2) during the formation of SiO2 via the sol-gel approach. The obtained DOX@SiO2 nanoparticles are then added to poly(ɛ-caprolactone) (PCL) and po......
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Preparation of the vulcan XC-72R-supported Pt nanoparticles for the hydrogen evolution reaction in PEM water electrolysers
Pt nanoparticles on vulcan XC-72R support (Pt/vulcan XC-72R) were prepared by the impregnation–reduction method. The Pt content, the morphological properties and the electrochemical catalysis of the Pt/vulcan XC 72R materials have been investigated by ICP-OES analysis, FESEM, TEM, and cyclic voltammetry. These materials were then used as catalyst for hydrogen evolution reaction at the cathod......
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Potential in-vitro anti-breast cancer activity of green-synthesized silver nanoparticles preparation against human MCF-7 cell-lines
An efficient bio-catalyzed synthesis of silver nanoparticles from aqueous silver nitrate solution was carried out utilizing the fresh Buchanania axillaris leaves' aqueous-n-butanolic extract. The high-density yield silver nanoparticles were characterized by UV-Vis (Ultraviolet-visible), Fourier-transform infra-red (FT-IR), X-ray diffraction (XRD), energy dispersive-absorption X-rays (EDX......
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Solution processing of microcavity for BioMEMS application
Compared to the conventional silicon-based technology, the solution process appears to be a revolution in the field of micro/nanofabrication due to its advantages of high efficiency in material and energy consumption and the use of low cost material. In this paper, we introduce a new approach to fabricate BioMEMS devices using this novel technology to make microcavity. Zirconium oxide patter......
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Time-resolved photoluminescence study of CuInS2/ZnS nanocrystals
The emission mechanism in ZnS-capped 3-nm CuInS2 nanocrystals was studied by using time-resolved photoluminescence (TRPL). A typical TRPL spectrum demonstrates two broad emission bands. The spectral shifts as functions of the excitation power density and delay times from the excitation moment prove that both emission bands originate from donor-acceptor pair recombinations. Moreover, the ......
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About the indexing of the structure of single-walled carbon nanotubes from resonant Raman scattering
We review the information that we have obtained from combined Raman spectroscopy and electron diffraction experiments on individual free-standing single-walled carbon nanotubes (SWNT). From these data, we define Raman criteria allowing the indexing of SWNTs from their Raman features only and we show the efficiency of this approach in assigning the structure of individual carbon nanotubes. These re......
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Green synthesis of silver nanoparticle and silver based chitosan bionanocomposite using stem extract of Saccharum officinarumand assessment of its antibacterial activity
Synthesis of nanoparticles and nanocomposites using green route is a major focus of modern nanotechnology. Herein we demonstrate the synthesis of silver nanoparticle and silver based chitosan bionanocomposite using the stem extract of Saccharum officinarum. The absorbance peak at 460 nm in the UV–Vis spectrum reveals the synthesis of silver nanoparticles using the stem extract of S......
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pH sensitivity of emeraldine salt polyaniline and poly(vinyl butyral) blend
pH sensitivity of emeraldine salt polyaniline (ES-PANI) and poly(vinyl butyral) (PVB) blend film was investigated. This blend film can be used as a pH sensing element in new-type pH sensors to replace traditional instruments based on fragile glass electrodes for pH measurement of water in aquaculture farming. Structural and optical characteristic of PANI were studied by Fourier transform inf......
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Low-temperature UV photoluminescence of ion beam synthesized Si nanoclusters embedded in Si
Ultraviolet (UV) photoluminescence (PL) data taken on a double Au implanted Si matrix are reported. This has been studied over a wide temperature range of 28–220 K. At low temperature, the spectrum shows four peaks corresponding to a zero-phonon line (ZPL) and three low-energy phonon-assisted lines. At 28 K the ZPL has an energy of 3.362 eV with a lifetime of ~240 ps suggesting transitio......
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Tổng số: 893
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