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Journal of Nanoscience and Nanotechnology

Hyungjin Kim, Sihyun Kim, Hyun-Min Kim, Kitae Lee, Sangwan Kim, Byung-Gook Pak
No abstract text is available yet for this article.
October 1, 2018: Journal of Nanoscience and Nanotechnology
Wen-Jen Liu, Yuan-Tsung Chen, Wei-Chiao Liang, Wei-Hsiang Chan, Jiun-Yi Tseng, Te-Ho Wu, Po-Wei Chi
The following structures are deposited under the conditions (a) glass/Ru(X nm)/Co60Fe20V20(5 nm) and (b) glass/Ta(Y nm)/Co60Fe20V20(5 nm) at room temperature (RT), where X and Y is from 5 nm to 10 nm. X-ray diffraction (XRD) patterns of glass/Ru(X nm)/Co60Fe20V20(5 nm) and glass/Ta(Y nm)/Co60Fe20V20(5 nm) reveal a weak crystallization at peak β-(200) as the thicknesses of Ta increase from 8 nm to 10 nm, and the patterns indicate an amorphous state as the thicknesses of all Ru films and Ta thicknesses increase from 5 nm to 7 nm...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Prasopporn Junlabhut, Chakkaphan Wattanawikkam, Wanichaya Mekprasart, Wisanu Pecharapa
Metal-doped TiO2 nanoparticles (Metal = Mn, Co, Zn, Ni) were synthesized by sonochemical method accompanying post calcination process using metallic nitrates of manganese, cobalt, zinc, nickel with various metal contents from 0-5 mol% and titanium isopropoxide as a starting precursors. Sodium hydroxide (NaOH) base was used as a precipitating agent. The influence of ultrasound operated at 750 W 20 kHz on the crystalline structure of metal-doped TiO2 nanoparticles has been characterized by X-ray diffraction (XRD) while morphologies and grain size of the nanoparticles were monitored by field emission scanning electron microscope (FE-SEM)...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Krisana Chongsri, Yoichiro Neo, Hidenori Mimura, Kanokthip Boonyarattanakalin, Wisanu Pecharapa
In this work, effects of annealing temperature of seeding layer on structural properties and morphologies of Ga/F co-doped ZnO nanostructures synthesized by hydrothermal process were investigated by varying the annealing temperature of seed layer as 300-500 °C. The ZnO seeding layers were deposited onto cleaned glass substrates by dip-coating technique using zinc acetate dehydrate (CH3COO)2Zn·2H2O as starting coating precursor. The Ga/F co-doped ZnO nanostructures were then grown on these seed layers by conventional hydrothermal process using Zn(NO3)2, NH4F, GaN3O9 and hexamethyltetramine as Zn, F and Ga sources, respectively...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Fabrício N Tanaka, Carlos R Ferreira, Marcia R de Moura, Fauze A Aouada
The growth in global population has caused an increase in the demand for food production, leading to an increase in the use of agrochemicals. Their overuse causes serious damage to the environment. In this way, nanocomposite hydrogels are promising materials for use as carrier vehicles for the controlled release of agrochemicals, which helps reduce the damage caused by their indiscriminate use. In this work, a novel hydrogel nanostructure based on carboxymethylcellulose (CMC) and zeolite with a poly(methacrylic acid)-co-polyacrylamide (PMAA-co-PAAm) support network was synthesized...
October 1, 2018: Journal of Nanoscience and Nanotechnology
C Y Ho, B C Chen, Y H Tsai, Y J Chiou, M Y Wen, R H Wong
This paper analytically investigates the picosecond laser ablation of polymer. Laser-pulsed ablation is a well-established tool for polymer. However the ablation mechanism of laser processing for polymer has not been thoroughly understood yet. This study utilized a thermal transport model to analyze the relationship between the ablation rate and laser fluences. This model considered the energy balance at the decomposition interface as the ablation mechanisms and is applied to predict the laser-ablated depth of Acrylonitrile Butadiene Styrene/PolyVinyl Chloride (ABS/PVC)...
October 1, 2018: Journal of Nanoscience and Nanotechnology
No-Kuk Park, Yong Han Jeong, Tae Jin Lee, Seung Hyun Lee, Seung Hun Lee
Macro-porous silicon, which can be used as an anode material for lithium-ion batteries (LIBs), was synthesized by the reduction of macro-porous silica, which had been prepared by template method, using aluminum metal fine powder as the reducing agent. A TEOS-PMMA (tetra-ethyl-ortho-silicate, poly-methyl-meta-acrylate) mixture solution was used as a precursor to prepare the macro-porous silica. PMMA was synthesized as spherical type nano-beads using a suspension polymerization method. Silica gel was formulated by the hydrolysis of TEOS and macro-sized pores were formed in the silica particles by the decomposition of PMMA during the thermal treatment at high temperatures...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Antonino Mazzaglia, Roberto Zagami, Andrea Romeo, Francesca Ceraolo, Monica Vazzana, Maria Angela Castriciano, Caterina Faggio, Luigi Monsù Scolaro
Supramolecular adducts obtained by interaction between the anionic porphyrin meso-tetrakis(4-carboxyphenyl)porphyrin (TPPC) or its zinc(II) derivative (ZnTPPC) with a biocompatible amino-terminated polypropylene or poly(ethylene oxide)s (Jeffamines) has been investigated. The interaction with the polymer allows the stabilization of the porphyrins in their monomeric form under physiological conditions. The photodynamic properties of the supramolecular adducts were explored by typical 1O2 indirect detection. Their photodynamic action were evaluated in vitro using human red blood cells (HRBCs) under different experimental conditions...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Ratna Frida Susanti, Gerardus Kevin, Marcelinus Erico, Arenst Andreas, Hans Kristianto, Tony Handoko
Hydrochar from the hydrothermal treatment of biomass is considered as a potential precursor for activated carbons (AC) which has been widely utilized not only for adsorbents but also for energy storage application. The advantages of hydrochar from hydrothermal treatment include its high Oxygenated Functional Group (OFG) and high porosity. The authors have been working on the biomass conversion for energy storage application. In our study, salacca peel was used as a biomass source. In previous research for the preparation of AC, conventional carbonization and activation methods were used, resulting in a high surface area of AC...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Jin Kyeong Kang, Wei Xiong, Ji Hoon Kang, Jukyoung Kang, Seok Kim, Yongju Jung
We present a novel approach for the synthesis of large-pore mesoporous carbon with a highly porous structure, based on an oil/water (O/W) emulsion templating method. For the formation of oil-in-water emulsions with nanoscale oil droplets, polyvinylpyrrolidone was used as an emulsifier. Mesoporous carbon materials with large mesopores were successfully synthesized via a three-step process: (1) polymerization in the oil-in-water emulsion, (2) filtration, and (3) carbonization. We confirmed that the pore size of the carbon can be significantly reduced through a modified O/W emulsion method...
October 1, 2018: Journal of Nanoscience and Nanotechnology
J Y Sug, S H Lee
We investigated theoretically the temperature dependence of the quantum optical transition of quasi 2-Dimensional Landau splitting system, in GaN and ZnS. We apply the Quantum Transport theory (QTR) to the system in the confinement of electrons by square well confinement potential. We use the projected Liouville equation method with Equilibrium Average Projection Scheme (EAPS). Through the analysis of this work, we found the increasing properties of Quantum Transition Line Shapes (QTLSs) and the Quantum Transition Line Widths (QTLWs) of CdS and GaN with the temperature we also found that QTLW, γ(T) of ZnS < γ(T) of GaN in γ = 394 μm...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Xiaoyan Li, Yanfang Sun, Xiao Zhang, Jinxue Guo
The electrochemical sensing performance is sensitive to the surface area. To achieve superior performance, we design and anchor Co3O4 nanosheets on the surface of SiO2 nanospheres via a simple solvothermal method, which possess large sensing interface and exposed catalytic sites due to the 2D structure and edge terminated feature. Based on these combined structural advantages, the present sample is employed as an ideal platform for non-enzymatic glucose sensing and exhibits high sensitivity, low detection limit, and wide linear range for glucose electrocatalytic oxidation, enabling it as a promising candidate for enzyme-free amperometric sensor for glucose determination...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Khuong Anh Nguyen Quoc, Hau Thi Hien Vo, Tuan Phan Dinh, Long Giang Bach, Van Thi Thanh Ho
This article describes the synthesis and characterization of tin-doped indium oxide (ITO) and platinum nanoparticles deposited on ITO. For different calcination temperatures, the tin-doped indium oxide nanoparticles (ITO NPs) were synthesized successfully by a nonaqueous sol-gel method with indium acetylacetonate and tin bis(acetylacetonate) dichloride in oleylamine as the precursors. The ITO sample that calcinated at 500 °C exhibited a spherical morphology with a narrow range of the particle size distribution (15-20 nm)...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Zhuo Luo, Difa Xu, Shiying Zhang, Jie Shen
ZnWO4 with controllable morphology was successfully synthesized via a facile hydrothermal method. The relationships between the structure, morphology, and catalytic activity were systemically studied by varying both the hydrothermal time and pH value. The optimal synthesis conditions for ZnWO4 with superior catalytic activity were a hydrothermal time of 12 h and a pH value of 10. Impressively, the highest photocatalytic activity for the degradation of RhB was 91% for 60 min under ultraviolet light. The increased photodegradation performance was mainly ascribed to the high crystallinity and enlarged surface area of the optimal ZnWO4...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Xuwei Pan, Qingchuan Du, Ying Zhou, Lichun Liu, Gang Xu, Chao Yan
Graphene aerogels (GA) hold great promise as a practical adsorbent to remove contaminants from water thanks to their high specific surface area and stable chemical properties. In this work, we demonstrated a strategy by introducing ferrous ions-ammonia borane as a synergistic reducing agent for hydrothermal reduction of graphene oxide to synthesize high-performance graphene aerogel adsorbents. Reducing agent system features four aspects: (1) Ferrous ions themselves as reducing agent, (2) Ferrous ions as catalyst for ammonia borane decomposition to release hydrogen, (3) Released hydrogen as a secondary reducing agent, (4) Involved hydrogen gas bubbles facilitating the formation of pores in GA...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Qian Zhao, Bin Wang, Ruifeng Liu, Ming Gong, Mingfeng Dong, Minglan Fang, Tingshun Jiang
The doxorubicin hydrochloride (DOX)-loaded poly(L-lactic acid)/hydroxyapatite/gelatin (PLLA/a-HA/gelatin) particle was prepared by emulsion/solvent evaporation method using CH2Cl2 as a solvent. HA nanoparticles were prepared via a facile chemical precipitate method and HA nanoparticles were functionalized by adding aminopropyltriethoxysilane (APTS) under microwave radiation. The physical and chemical properties of HA and modified HA were characterized by XRD, TEM, FT-IR, and XPS. Furthermore, the release of DOX from PLLA/a-HA/gelatin was also estimated...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Sora Oh, Da Hun Kim, Taek Ahn, Sang Kyu Lee
A novel series of benzodithiophene-4,8-dione (BDD)-based copolymers, poly[(4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro-s-indacenodithiophene-2,7-diyl)-alt-(1,3-bis(2-ethylhexyl)-5,7-di(thiophene2-yl)benzodithiophene-4,8-dione)] (P1) and poly[(5,5,11,11-tetrakis(4-hexylphenyl)dithieno[2,3-d: 2',3'-d']-s-indacenodithiophene-3,9-diyl)-alt-(1,3-bis(2-ethylhexyl)-5,7-di(thiophene-2-yl)benzodithiophene-4,8-dione)] (P2), which have the same acceptor moiety but different donor segments, have been designed and synthesized for use as donor materials in solution-processable polymer solar cells (PSCs)...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Geon Hyeong Lee, Young Sik Kim
A novel carbazole-based organic dye with heteroleptic dual electron acceptors (cyanoacrylic acid and thieno[3,4-b]pyrazine acid) on each side of a quinoxaline was designed, and its electronic and optical properties were investigated theoretically for dye-sensitized solar cells (DSSCs). To gain insight into the factors responsible for photovoltaic efficiency, density functional theory (DFT) and time-dependent density functional theory (TD-DFT) calculations of these dyes were performed. The absorption spectrum of the dyes showed different forms because of the different energy levels of the molecular orbital (MO) of each dye and the intramolecular energy transfer (EnT)...
October 1, 2018: Journal of Nanoscience and Nanotechnology
Geon Hyeong Lee, Young Sik Kim
Novel thermally activated delayed fluorescence (TADF) materials with pyridine (Pd), pyrimidine (Pm), and triazine (Trz) as electron acceptors and carbazole (Cz) as an electron donor (TmCzPd, TmCzPm, and TmCzTrz) were designed, and the effect of the number of nitrogen (N) atoms with acceptor units was investigated by comparing their electronic and optical properties for blue organic light-emitting diodes (OLEDs). Using density functional theory (DFT) and time-dependent DFT calculations, we obtained the electron distributions of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO), and the energies of the lowest singlet (S1)and lowest triplet (T1) excited states...
October 1, 2018: Journal of Nanoscience and Nanotechnology
In-Hye Lee, Dong-Myung Shin
Photo-activator is a kind of additive that can improve the anchoring energy by attacking some of the bonds of polyimide (PI). Photo-activators were synthesized from the reaction of cyclohexanone oxime with three different anhydrides, respectively. Each activator generates different active radicals when irradiated. These fragmented and activated radicals are responsible for the liquid crystal (LC) alignment of PI film. The reactivity was confirmed through UV-Visible spectroscopy. All the three photo-activators had characteristic bimodal-shaped absorption peaks at 270∼280 nm...
October 1, 2018: Journal of Nanoscience and Nanotechnology
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