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metal nanoparticle

Yating Wang, Yinghong Qiao, Pei Wang, Qiang Li, Chaofeng Xia, Man Ju
Nowadays biological mediated syntheses of metal nanoparticles were utilized for various life caring applications. Our research group utilized Delonix elata leaf aqueous extract for the synthesis of silver nanoparticles. Further the synthesized silver nanoparticles were subjected for various characterization techniques which resulted in spherically agglomerated with biological components entrapped in it and also with average particle size of 36nm were studied and reported. Later the synthesized silver nanoparticles were subjected for wound healing property by size of measured lessions and body weight which results in better wound healing property were studied and discussed...
October 27, 2017: Journal of Photochemistry and Photobiology. B, Biology
Yong Huang, Jie Tan, Lijie Cui, Zhide Zhou, Sufang Zhou, Zhenghua Zhang, Rong Zheng, Yewei Xue, Mengxin Zhang, Shanshan Li, Nixuan Zhu, Jintao Liang, Guiyin Li, Liping Zhong, Yongxiang Zhao
Cholesterol is an essential ingredient in mammals, and serum cholesterol is a major component of atherosclerotic plaques. The level of cholesterol in human serum has become an important index for clinical diagnosis and prevention of cardiovascular disease. In this paper, a simple and ultrasensitive cholesterol biosensor based on graphene oxide (GO) and gold nanoparticles (Au NPs) co-mediated enzymatic silver deposition was designed by immobilizing cholesterol oxidase (CHOD), cholesterol esterase (CHER) and GO onto the surface of Au NPs modified screen-printed carbon electrode (SPE)...
November 11, 2017: Biosensors & Bioelectronics
Facai Wu, Shuyao Si, Tuo Shi, Xiaolong Zhao, Qi Liu, Lei Liao, Hangbing Lv, Shibing Long, Ming Liu
Pt/SiO<sub>2</sub>:metal nanoparticles (MNPs)/Pt sandwich structure is fabricated with the method of metal ion (Ag) implantation. The device exhibits multilevel storage with appropriate R<sub>off</sub>/R<sub>on</sub> ratio, good endurance and retention properties. Based on transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS) analysis, we confirm that Pt nanoparticles are spurted into SiO<sub>2 </sub>film from Pt bottom electrode by Ag implantation; during electroforming, the local electric field can be enhanced by these Pt nanoparticles, meanwhile the Ag nanoparticles constantly migrate toward the Pt nanoparticles...
December 8, 2017: Nanotechnology
Manaf AlMatar, Essam A Makky, Isil Var, Fatih Koksal
BACKGROUND: Until recently, one of the main reasons for mortality has been infectious diseases, and bacteria that are drug-resistant have emerged as a result of the wide application, as well as the misuse, of antibacterial medications. Having multidrug-resistance, bacteria present a great problem for the efficient management of bacterial infections and this challenge has resulted in the creation of other means of dealing with bacterial diseases. Of late, metallic nanoparticles (NPs), employed as antibacterial agents, have the potential for use against resistance to bacterial drugs...
December 7, 2017: Current Drug Delivery
Dae Ho Lee, Yuri Bae, Yu Na Kim, Joo-Yeon Sung, Se Won Han, Dong Pil Kang
Optimizing the colloidal state of polyamic acid (PAA) nanoparticles is essential for achieving a uniform and high-performance polyimide (PI) coating by electrophoretic deposition (EPD) on metal substrates of various shapes. In this paper, we report two important roles of the counterions in the formation of PAA colloids for EPD, which, to date, have not been recognized. First, when tertiary alkyl amines are used to neutralize PAA, the polarity of neutralizing counterions determines the size and stability of the PAA colloidal particles...
December 7, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Zachary J Farrell, Christopher Tabor
Eutectic gallium-indium alloy (EGaIn, a room-temperature liquid metal) nanoparticles are of interest for their unique potential uses in self-healing and flexible electronic devices. One reason for their interest is due to a passivating oxide skin that develops spontaneously on exposure to ambient atmosphere which resists deformation and rupture of the resultant liquid particles. It is then of interest to develop methods for control of this oxide growth process. It is hypothesized here that functionalization of EGaIn nanoparticles with thiolated molecules could moderate oxide growth based on insights from the Cabrera-Mott oxidation model...
December 7, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Yueying Wu, Guoliang Li, Jon P Camden
Electron energy loss spectroscopy (EELS) performed in a scanning transmission electron microscope (STEM) has demonstrated unprecedented power in the characterization of surface plasmons. The subangstrom spatial resolution achieved in EELS and its capability of exciting the full set of localized surface plasmon resonance (LSPR) modes supported by a metallic nanostructure makes STEM/EELS an ideal tool in the study of LSPRs. The plasmonic properties characterized using EELS can be associated with geometric or structural features collected simultaneously in a STEM to achieve a deeper understanding of the plasmonic response...
December 7, 2017: Chemical Reviews
Qin Hu, Xue-Zhong Sun, Christopher D J Parmenter, Michael W Fay, Emily F Smith, Graham A Rance, Yinfeng He, Fan Zhang, Yaan Liu, Derek Irvine, Christopher Tuck, Richard Hague, Ricky Wildman
The fabrication of complex three-dimensional gold-containing nanocomposite structures by simultaneous two-photon polymerisation and photoreduction is demonstrated. Increased salt delivers reduced feature sizes down to line widths as small as 78 nm, a level of structural intricacy that represents a significant advance in fabrication complexity. The development of a general methodology to efficiently mix pentaerythritol triacrylate (PETA) with gold chloride hydrate (HAuCl4∙3H2O) is reported, where the gold salt concentration is adjustable on demand from zero to 20 wt%...
December 7, 2017: Scientific Reports
Hui Sun, Jinhui Jiang, Yufen Xiao, Jianzhong Du
It is an important challenge to effectively remove environmental pollutants such as polycyclic aromatic hydrocarbons (PAHs), dyes and heavy metal ions at a low cost. Herein, we present a multifunctional homopolymer vesicle self-assembled from a scalable homopolymer, poly(amic acid) (PAA) at room temperature. The vesicle can efficiently eliminate PAHs, cationic dyes and heavy metal ions from water based on π-π stacking, hydrophobic effect and electrostatic interactions with the pollutants. The residual concentrations of PAHs, cationic dyes and heavy metal ions (such as Ni2+) in water are lower than 0...
December 6, 2017: ACS Applied Materials & Interfaces
Rashmi A Agarwal
A simple method for the sequestration of As(III) and Cr(VI) from water has been demonstrated by utilizing a high flexible porous coordination polymer (PCP) of Ni(II) in its as synthesized form or without solvent removal. This PCP reduces highly toxic As(III) and Cr(VI) ions into non-toxic As(0) and Cr/Cr2O3/CrO2 (zero, tri and tetravalent) nanoparticles (NPs) within its pores characterized by PXRD, XPS and HRTEM analysis. The high functionality of this polymer is due to the presence of monodentate carboxylate groups of benzenetricarboxylate linker which provide anchoring sites to the metal ions of metal precursors...
December 6, 2017: Nanotechnology
Liang Jiang, Peng Zhou, Chanjuan Liao, Zehui Zhang, Shi Wei Jin
A new method has been developed for the deoxygenation of vanillin to produce 2-methoxy-4-methylphenol (MMP) as a promising liquid fuel over a heterogeneous non-noble metal catalyst. The nitrogen-doped carbon supported Co nanoparticles (Co/N-C-600) exhibited high activity and stability for the deoxygenation of vanillin into MMP under mild conditions (150 oC, 10 bar H2). Nearly quantitative MMP yield was obtained in iso-propanol after 8 h at 150 oC and 10 bar H2 pressure. According to the distribution of products with time, the deoxygenation of vanillin into MMP mainly underwent the hydrogenation of vanillin into vanillyl alcohol and the subsequent hydrogenolysis of vanillyl alcohol into MMP, and the latter was the rate-determining step, which had a much higher active energy...
December 6, 2017: ChemSusChem
Fayaz Ali, Sher Bahadar Khan, Tahseen Kamal, Khalid A Alamry, Abdullah M Asiri, Tariq R A Sobahi
A simple, economically viable and fast method has been utilized for the preparation of highly active metal nanoparticles (MNPs) in coating layer of chitosan (CH) over cellulose microfibers of cotton cloth (CC). 2 wt% of CH solution was used for the coating of CC strips (CC-CH), and were kept in aqueous solutions of metal salts to adsorb metal ions. The CC-CH templated with metal ions were then treated with aqueous solution of NaBH4 to reduce the metal ions into zero-valent metal nanoparticles (M0). The CC-CH strips loaded with M0 were characterized by XRD, XPS, ATR-FTIR, FE-SEM and TGA, which indicates the successful synthesis of MNPs by this method...
December 5, 2017: Scientific Reports
Kandasamy Saravanakumar, Myeong-Hyeon Wang
Antibacterial silver nanoparticles (AgNPs) are synthesized from various biological resources, but studies on Trichoderma-based synthesis are limited. Hence, the current work synthesized antibacterial silver nanoparticles using Trichoderma atroviride and also tested for their biomedical properties. AgNPs synthesis was confirmed by the occurrence of plasmon resonance at 390-400 nm in the UV-vis spectrum. FTIR spectrum displayed the bands at 1115.4 and 3450 cm-1 indicating the vibrations of the metallic oxides...
December 2, 2017: Microbial Pathogenesis
Meiguang Zheng, Shengwen Wang, Zhenghao Liu, Lin Xie, Yuefei Deng
Recently most of the researchers have turned their interest towards plant mediated synthesis of metal nanoparticles to avoid several environmental toxicants. In this manuscript, we have discussed the ecofriendly syntheses of zinc oxide nanoparticles (ZnO NPs) were achieved using Glycyrrhiza glabra (G. glabra) seed aqueous extract. The green synthesized ZnO NPs were characterized using analytical techniques like XRD, TEM, particle size histogram and Zeta potential. From the results, it was found that the green synthesized ZnO NPs were around 35nm in size with irregular spherical shape...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Yael Gutiérrez, Dolores Ortiz, José M Saiz, Francisco González, Henry O Everitt, Fernando Moreno
For applications of surface-enhanced spectroscopy and photocatalysis, the ultraviolet (UV) plasmonic behavior and charge distribution within rhodium nanocubes is explored by a detailed numerical analysis. The strongest plasmonic hot-spots and charge concentrations are located at the corners and edges of the nanocubes, exactly where they are the most spectroscopically and catalytically active. Because intense catalytic activity at corners and edges will reshape these nanoparticles, distortions of the cubical shape, including surface concavity, surface convexity, and rounded corners and edges, are also explored to quantify how significantly these distortions deteriorate their plasmonic and photocatalytic properties...
December 4, 2017: Nanomaterials
Amaia Iturrondobeitia, Aintzane Goñi, Izaskun Gil de Muro, Luis Lezama, Teófilo Rojo
Nanoparticulate NiO and NiO/C composites with different carbon proportions have been prepared for anode application in lithium and sodium ion batteries. Structural characterization demonstrated the presence of metallic Ni in the composites. Morphological study revealed that the NiO and Ni nanoparticles were well dispersed in the matrix of amorphous carbon. The electrochemical study showed that the lithium ion batteries (LIBs), containing composites with carbon, have promising electrochemical performances, delivering specific discharge capacities of 550 mAh/g after operating for 100 cycles at 1C...
December 2, 2017: Nanomaterials
Li Wang, Siyuan Chen, Yiming Ding, Qiang Zhu, Nijia Zhang, Shuqing Yu
The present work determines the anticancer activity of bio-mediated synthesized cadmium sulfide nanoparticles using the ionic liquid and bacterial cells (Shewanella oneidensis). Bacterial cells have been exposed to be important resources that hold huge potential as ecofriendly, cost-effective, evading toxic of dangerous chemicals and the alternative of conventional physiochemical synthesis. The Shewanella oneidensis is an important kind of metal reducing bacterium, known as its special anaerobic respiratory and sulfate reducing capacity...
November 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
Burak Özdamar, Assil Bouzid, Guido Ori, Carlo Massobrio, Mauro Boero
Thermal decomposition is a practical and reliable tool to synthesize nanoparticles with monodisperse size distribution and reproducible accuracy. The nature of the precursor molecules and their interaction with the environment during the synthesis process have a direct impact on the resulting nanoparticles. Our study focuses on widely used transition metal(Co, Fe) stearates precursors and their thermal decomposition reaction pathway. We show how the nature of the metal and the presence or absence of water molecules, directly related to the humidity conditions during the synthesis process, affects the decomposition mechanism and the resulting transition-metal oxide building blocks...
December 5, 2017: Journal of Chemical Theory and Computation
Tesfalem Geremariam Welearegay, Umut Cindemir, Lars Österlund, Radu Ionescu
Here we report for the first time the fabrication of ligand functionalised ultrapure monodispersed metal nanoparticles (Au, Cu, and Pt) from their pure metal precursors using the Advanced Gas Deposition technique. The experimental conditions during nanoparticles formation were adjusted in order to obtain ultrafine isolated nanoparticles on different substrates. The morphology and surface analysis of the as-deposited metal nanoparticles were investigated using Scanning Electron Microscopy, X-ray Diffraction and Fourier Transform Infrared Spectroscopy, which demonstrated the formation of highly ordered pure crystalline nanoparticles with a relatively uniform size distribution of ~10 nm (Au), ~ 4 nm (Cu) and ~ 3 nm (Pt), respectively...
December 5, 2017: Nanotechnology
Zhizhong Zheng, Haitao Xu, Zhenliang Xu, Jianping Ge
A Zr-based metal-organic framework (MOF) catalyst, Pt/Au@Pd@UIO-66, is assembled, where UIO-66 is Zr6 O4 (OH)4 (BDC)6 (BDC = 1,4-benzenedicarboxylate). The gold nanoparticles (NPs) act as the core for the epitaxial growth of Pd shells, and the core-shell monodispersed nanosphere Au@Pd is encapsulated into UIO-66 to control its morphology and impart nanoparticle functionality. The microporous nature of UIO-66 assists the adsorption of Pt NPs, which in turn enhances the interaction between NPs and UIO-66, favoring the formation of isolated and well-dispersed Pt NP active sites...
December 4, 2017: Small
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