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Journal of Nanoscience and Nanotechnology

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https://www.readbyqxmd.com/read/29458653/does-the-abiotic-formation-of-oligopeptides-on-tio%C3%A2-nanoparticles-require-special-catalytic-sites-apparently-not
#1
Marco Fabbiani, Marco Pazzi, Marco Vincenti, Gloria Tabacch, Ettore Fois, Gianmario Martra
The oligomerization of non-activated amino acids catalyzed by nanostrucrured mineral oxide surfaces holds promises as a sustainable route for the industrial production of polypeptides. To analyze the influence of the surface type on the catalytic process, we performed, via a mild Chemical Vapor Deposition approach, the oligomerization of Glycine on two samples of TiO2 nanoparticles characterized by different relative amounts of defective surface terminations. Based on infrared spectroscopy and mass spectrometry data, we show herein that the formation of peptide bonds on titania nanoparticles does not require highly energetic surface terminations, but can occur also on the most abundant and thermodynamically most stable {101} facets of nanosized anatase...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458652/morphology-control-of-eu-doped-amorphous-gehlenite-phosphors-prepared-by-spray-pyrolysis
#2
Shao-Ju Shih, Yu-Jen Chou, Abadi Hadush, Shih-Heng Lin, Chih-Wei Hsiao
Eu-doped amorphous gehlenite phosphors with various morphologies were synthesized using spray pyrolysis. Along with un-treated precursor, two commonly used pore-forming agents, polyethylene glycol and hydrogen peroxide, were applied to achieve porous and hollow particle structures. The phase compositions, surface morphologies, inner structures and photoluminescence properties of the resulting phosphors were examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and fluorescence spectrometry...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458651/odd-even-effect-in-synthesis-of-mesoporous-silica-using-long-chain-acyl-l-alanine-sodium-salt-templating
#3
Jicong Pei, Hongxia Yin, Guangtong Xu, Hongmin Yuan, Xiangnong Liu, Yuxiang Yang
In this research, hexagonal and cubic mesoporous silica with ordered parallel pore channels was synthesized using odd chain-length N-undecanoyl-L-alanine sodium salt and even chain-length N-lauroyl-L-alanine sodium salt as template respectively. Aminopropylsiloxane was used as the co-structure-directing agents (CSDA). The ordered mesostructure was characterized by infrared spectroscopy, small X-ray diffraction patterns (XRD), scanning electron microscope (SEM), trasmission electron microscope (TEM), and nitrogen sorption analysis...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458650/utilization-of-nano-sio%C3%A2-as-a-supporting-material-for-immobilization-of-porcine-pancreatic-lipase
#4
Qiongdan Zhang, Junqing Qian, Hui Guo, Wei Zhang, Chunlan Kuang
Nano-SiO2 is an inexpensive material for enzyme immobilization and has been frequently utilized for this purpose. In addition to its low cost, Nano-SiO2 has several advantages when used as a supporting material, including its lack of toxicity and chemical reactivity, allowing easy fixation of enzymes. In this article, Porcine Pancreatic lipase was non-covalently immobilized on Nano-SiO2. The properties of immobilized enzyme were then defined. The optimum pH and temperature for the immobilized PPL for hydrolysis of olive oil were determined as 7...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458649/synthesis-of-pbs-and-ag2s-nanorods-via-polyol-process
#5
Chun Feng, Zhiwen Min, Yan Ran, Fei Teng, Huimin Wu, Shiquan Wang, Zhengguang Sun
PbS and Ag2S nanorods have been synthesized using a polyol process in the presence of poly(vinylpyrrolidone) (PVP). First, the production of Pb or Ag was realized via the thermal decomposition of a lead/silver salt. Then the Pb or Ag precursor was directly combined with S power under heating, leading to the formation of the final products. The samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS)...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458648/-in-situ-scanning-electron-microscopy-of-individual-carbon-nanotetrahedron-nanoribbon-structures-under-a-tensile-load
#6
Kohki Sasayama, Tetsushi Hayashi, Hideo Kohno
Flattening of a carbon nanotube with a switching of the flattening direction results in the formation of a nanotetrahedron/nanoribbon structure. In this study, behavior of individual carbon nanotetra-hedron/nanoribbon structures under a tensile load is observed by means of in-situ scanning electron microscopy using micro-manipulators. Positions of breakage caused by a tensile load are not necessarily at a nanotetrahedron/nanoribbon junction. The results indicate that the nanotetrahedron/nanoribbon junctions are not mechanical weak points under a tensile load, and the nanotetra-hedron/nanoribbon structures are as strong as simple multi-walled carbon nanotubes...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458647/highly-uniform-hollow-gdf3-ellipsoids-controllable-synthesis-characterization-and-up-conversion-luminescence-properties
#7
Yu Gao, Jinzhao Feng, Cheng Shi, Miaomiao Fan, Guiyan Zhao, Yanfeng Bi, Yaguang Sun, Fu Ding, Zhenhe Xu
In this paper, the hollow GdF3 ellipsoids were successfully synthesized through a facile hydrothermal approach. The results indicated that the as-obtained GdF3 sample has an orthorhombic structure and the average length and diameter of the hollow ellipsoids are 750 nm and 350 nm, respectively. The possible formation mechanism of the hollow GdF3 ellipsoids has been presented. The upconversion (UC) luminescence properties of the hollow GdF3: Yb3+/Ln3+ (Ln3+ = Er3+, Tm3+, Ho3+) ellipsoids were systematically investigated, which showed green (Er3+, 4S3/2, 2H11/2 → 4I15/2), blue (Tm3+, 1G4 → 3H6), and green (Ho3+, 5S2 → 5I8) luminescence under 980 nm NIR excitation, respectively...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458646/co%C3%A2-separation-membranes-consisting-of-ionic-liquid-cdo-composites
#8
Hyunyoung Kim, Hiesang Sohn, Sang Wook Kang
CdO nanoparticles were utilized in the fabrication of a composite membrane containing the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF-4) for CO2 separation. The use of BMIM+BF-4containing CdO nanoparticles as a CO2 separator greatly improved separation performance. The ideal selectivity for CO2/N2 was 32.5 with a CO2 permeance of 57.1 GPU when CdO 4 liquid. The enhanced separation performance nanoparticles were incorporated into the BMIM+BF-4and the was attributed to increased CO2 solubility facilitated by both the free ions in BMIM+BF-4 oxide layer of the CdO nanoparticle...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458645/preparation-of-well-aligned-tio%C3%A2-nanotubes-with-high-length-diameter-aspect-ratio-by-anodic-oxidation-method
#9
Zongmin Ma, Jian Gao, Xingsheng Wu, Yanna Xie, Hua Yuan, Yunbo Shi
This paper focused on the influence of various oxidation parameters such as electrolyte composition, reaction time, calcination temperature and current change on the morphology and structure of TiO2 nanotube arrays. It was found that ammonium fluoride with a high viscosity reduced the diffusion rate of fluoride ions and significantly increased the length of TiO2 nanotubes, creating nanotubes with ordered arrays and uniform diameters. Meanwhile, the time of anodic oxidation determined the length of TiO2 nanotube arrays...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458644/recycling-of-waste-poly-ethylene-terephthalate-bottles-by-alkaline-hydrolysis-and-recovery-of-pure-nanospindle-shaped-terephthalic-acid
#10
Sukhjinder Singh, Shelja Sharma, Ahmad Umar, Surinder Kumar Mehta, Manpreet Singh Bhatti, Sushil Kumar Kansal
Poly(ethylene terephthalate) (PET) is a versatile engineering plastic which exhibits exceptional mechanical and thermal properties. Huge amounts of PET are consumed in various industries such as food packaging industry, textile industry, in the manufacturing of audio, video tapes and X-ray films and so on. But due to its substantial fraction by volume in water bodies and its high persistence to the atmospheric and biological agents, it could be considered as a hazard substance. Thereby chemical recycling of PET serves as a solution to solid waste problem as it transforms PET into its monomers via hydrolysis...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458643/multilayer-nanoporous-graphene-as-a-water-purification-membrane
#11
Samaneh Rikhtehgaran, Amir Lohrasebi
Porous graphene sheets can be considered as an ultrathin membrane in reverse osmosis water desalination processes. In this paper, employing the molecular dynamics simulation method, the performance of multilayer porous graphene membranes with different pore sizes, layer separation, and layer number were investigated. We found that salt rejection and water flux through the membrane significantly depend on the graphene pore size and number of graphene layers, and controlling these parameters could improve the filtration process...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458642/preparation-of-ceo%C3%A2-quantum-dots-cu%C3%A2-o-nanocomposites-with-enhanced-photocatalytic-properties
#12
Hong-Bin Yu, Zi-Jia Rong, Ying Lu, Xin-Hong Wang, Xu-Biao Luo
To improve the efficiency of photocatalysts, a composite of CeO2-quantum dots/Cu2O (CeO2-QDs/Cu2O) was prepared through a one-step hydrothermal procedure in alkaline carbonate solution with Cu2(OH)2CO3 and Ce(NO3)3. 6H2O as precursors and glucose as reducing agent. The morphologies and structures of the prepared photocatalysts were well characterized utilizing Transmission Electron Microscopy (TEM), X-ray Diffractometry (XRD), X-ray Photoelectron Spectroscopy (XPS) and UV-Vis Diffuse Reflectance Spectrophotometer (DRS)...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458641/bio-directed-synthesis-of-calcium-oxide-cao-nanoparticles-extracted-from-limestone-using-honey
#13
E Arul, K Raja, S Krishnan, K Sivaji, S Jerome Das
Calcium oxide (CaO) nanoparticles have been synthesized by two step thermal decomposition method under ambient temperature. Structural analysis was carried out by powder X-ray diffraction method and the crystallite size of CaO nanoparticles was calculated using Scherrer formula. Fourier transform infrared spectroscopy (FTIR) analysis has been carried to identify the functional groups present in the synthesized specimen. Optical absorption studies reveal very low absorption in the entire visible region. The surface analysis of the synthesized particles was analysed using scanning electron microscope (SEM)...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458640/defect-related-green-red-luminescence-of-sb-doped-zno-nanorods-grown-by-vapor-phase-oxidation-method
#14
Moges Tsega, Francis Brihanu Dejene, Dong-Hau Kuo
Vertically aligned undoped and Sb-doped ZnO (ZnSbO) nanorods were grown by the vapor-phase oxidation process on sapphire substrates at 700 °C using Fe as the catalyst. The effect of Sb doping on surface morphology, structural and optical properties of ZnO were studied. The grown undoped and Sb-doped ZnO nanorods have a hexagonal wurtzite structure with preferential c-axis orientation. The as-grown nanorods morphology has shown length of 2-5 μm and a diameter of 100-250 nm. An elongated nanorods and high aspect ratio was observed in Sb-doped ZnO...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458639/investigation-of-the-extracellular-matrix-effect-for-the-qcm-ccd-cell-activity-monitoring-system
#15
Hyen-Wook Kang, Naoya Otani, Muramatsu Hiroshi, Sang-Mok Chang, Jong Min Kim
A real-time quartz crystal microbalance (QCM) cell activity monitoring system coupled with micro CCD cameras was developed to investigate the cultured cell activity, which could measure the viscoelastic characteristics of the cell with the QCM and observe the cell morphology changes with CCD camera simultaneously. Both the viscoelastic characteristics and the shape of the cultured cell are important factors to estimate the cell activity and the cell adhesion. The extracellular matrix (ECM) on the surface of the QCM is essential to culture the cell stably in the QCM monitoring system...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458638/bio-reduction-of-graphene-oxide-using-sulfate-reducing-bacteria-and-its-implication-on-anti-biocorrosion
#16
Tian-Shun Song, Wei-Min Tan, Jingjing Xie
In this paper, we developed an environmental friendly, cost effective, simple and green approach to reduce graphene oxide (GO) by a sulfate-reducing bacterium Desulfovibrio desulfuricans. The D. desulfuricans reduces exfoliated GO to reduced graphene oxide (rGO) at 25 °C in an aqueous solution without any toxic and environmentally harmful reducing agents. The rGO was characterized with X-ray Diffraction, Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscope, X-ray Photoelectron Spectroscopy and Raman Spectroscopy...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458637/controlled-synthesis-of-silver-micro-nano-leaves-for-oxygen-reduction-and-co%C3%A2-reduction
#17
Meng Wang, Rongji Liu, Shuangshuang Zhang, Bin Li, Ke Zhang, Guangjin Zhang
In this study, three different Ag micro/nano leaves were successfully synthesized through a galvanic displacement reaction by adjusting the concentration of Ag+. The catalytic activities of the prepared Ag micro/nano leaves toward ORR showed strong dependence on their morphology. An optimal concentration of Ag+ can result in a well-defined Ag micro/nano leaves with both crystallization and surface area, which showed the best activity towards ORR in alkaline media. In addition, the prepared Ag micro/nano leaves also showed high activity towards CO2 reduction, which required a potential of -0...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458636/shape-control-of-three-dimensional-self-assembly-graphene-by-hydrothermal-reaction-time-and-its-biological-application
#18
Huanhuan Gong, Mengli Zhao, Dejun Li, Rongxin Wan, Hanqing Gu
In this paper, three-dimensional self-assembly graphene (3D-G) was prepared by the hydrothermal synthesis method, and 3D-G was designed as a suitable biological scaffold for cell growth and adhesion. The shape of 3D-G was tuned by adjusting the hydrothermal reaction time (6 h, 12 h, 18 h and 24 h). Then the scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses were used to characterize the microstructure and component of 3D-G, which showed that the length, diameter, pore size and defects of 3D-G were all decreased as the reaction-time increased...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458635/synthesis-and-electrochemical-performance-of-nico%C3%A2-s%C3%A2-as-anode-for-lithium-ion-batteries
#19
Feixia Min, Yan Ran, Zhiwen Min, Fei Teng, Shiquan Wang, Huimin Wu, Chuanqi Feng
NiCO2S4 with different morphology was controllably fabricated by a facile hydrothermal and solvothermal route. The as-obtained samples were analyzed and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The results reveal that the sample (NCS-1) prepared by hydrothermal method manifest a mixture of nanorods and nanospheres. The sample (NCS-2) synthesized by solvothermal process takes on spherical nanoparticles (NPs). It is found that the morphology of the sample has much influence on the electrochemical property...
August 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29458634/comparison-of-stabilizer-effects-on-the-size-dispersion-and-catalytic-property-of-pt-ptcu-and-ptru-nanoparticles
#20
Junichiro Kugai, Satoshi Seino, Takashi Nakagawa, Takao A Yamamoto, Shingo Tanaka, Noboru Taguchi
Carbon-supported Pt, Pt-Cu, and Pt-Ru nanoparticles were prepared by an alcohol reduction method in the presence of carboxylates and phosphinate in order to investigate the role of these stabilizers in the nanoparticle formation process and the effect on catalytic properties in 2-propanol oxidation. For the Pt-Cu system, long chain carboxylate gave small dispersed particles even with high metal loading while phosphinate gave aggregated particles. For the Pt and Pt-Ru systems, fewer aggregates were observed and the particle size was independent of the chain length of carboxylate while much smaller and dispersed particles were obtained with phosphinate...
August 1, 2018: Journal of Nanoscience and Nanotechnology
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