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Journal of Nanoscience and Nanotechnology

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https://read.qxmd.com/read/30744804/single-crystalline-nanosheets-of-hybrid-perovskite-fabricated-by-a-vapor-solution-sequential-deposition-route
#1
Boya Zhao, Jie Liu, Zhi-Hua Li, Yao-Xuan Chen, Qian-Qing Ge, Yaqing Feng, Jin-Song Hu
Organic-inorganic hybrid perovskite single crystals have attracted much attention due to their superior optoelectronic properties. Herein, we report a facile vapor-solution sequential route to prepare single-crystalline nanosheets of hybrid lead triiodide perovskite. It is found that this two-step deposition is able to fabricate sizeable high-quality single-crystalline nanosheets with no need of delicate control of crystallization conditions such as concentration or temperature for normal single crystal growth...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744803/synthesis-of-phenyl-esters-using-sio%C3%A2-so%C3%A2-h-catalyst-in-conventional-heating-and-microwave-irradiated-esterification-processes
#2
Sandro L Barbosa, Myrlene Ottone, Milton de S Freitas, Camila D Lima, David L Nelson, Giuliano C Clososki, Franco J Caires, Stanlei I Klein, Gabriela R Hurtado
A SiO₂-SO₃H amorphous catalyst containing a small surface area of 115.0 m²g-1 and 1.32 mmol H+ /g was prepared from fine construction sand and sodium carbonate and sulfonated with H₂SO₄. In a 10% (w/w) basis, it is very efficient for catalyzing the esterification of carboxylic acids with phenol. The reaction processes were performed using conventional heating and under microwave irradiation. The yields were higher in the microwave-irradiated esterification. The catalyst could be used for three esterification sequences in both processes...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744802/preparation-of-ga%C3%A2-o%C3%A2-doped-sulfonated-tin-oxides-as-a-highly-active-and-recyclable-heterogeneous-solid-acid-catalyst-for-aldol-reactions
#3
Dewei Zhai, Changyan Cao, Bin Shao, Dong Liu, Weiguo Song
Ga₂O₃ doped sulfonated tin oxide catalysts were prepared via co-condensation method in ethanol solvent, followed by sulfonation and calcination. The samples were characterized by isothermal nitrogen adsorption/desorption, powder X-ray diffraction (XRD), thermal gravimetric analysis (TG), Raman spectra and DRIFT spectra. The number of acid sites on the catalysts was measured with the potentiometric titration of butyl amine. The results showed that the addition of small amounts of Ga₂O₃ to sulfonated tin oxide resulted in an enhanced acid site density, which makes Ga₂O₃ doped sulfonated tin oxide catalysts highly active for aldol reactions...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744801/evidence-of-tetrahedrally-coordinated-nickel-cations-in-nanostructured-nife%C3%A2-o%C3%A2
#4
Martin Fabián, Marta Harničárová, Jan Valíček, Klebson L Da Silva, Horst Hahn, Vladimír Šepelák, Michal Lesňák, Milena Kušnerová
Nanostructured nickel ferrite (NiFe₂O₄) is prepared via high-energy ball milling of the bulk counterpart at ambient temperature. The structure of the as-prepared nanoferrite is characterized by Raman spectroscopy and 57 Fe Mössbauer spectroscopy. Due to the ability of these spectroscopic techniques to probe the local environment of ions, valuable complementary insight into the nature of the local structural disorder of nanosized NiFe₂O₄ is provided. For the first time, evidence is given of the tetrahedrally coordinated nickel cations in the nanomaterial...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744800/combinatorial-research-of-molecular-technologies-and-surface-nanostructures-applied-to-the-development-of-antifouling-coatings
#5
Bing Yin, Chaohong Liu
Contact antimicrobial coatings have been a subject of increasing interest partly because of the contribution of biocide release coatings to antibiotic resistance. The surface hydrophobicity of these coatings can enhance their effectiveness and stability. In this work, polyethyleneimine (PEI) was quaternized with 1-bromoalkane and iodomethane, and a concept for antimicrobial coatings was developed on the basis of the polyelectrolyte multilayered films. The multilayered films were endowed with antibacterial property by grafting modified polycation (higher charge density) and with fouling-release property by constructing microstructures and nanostructures with low surface energy (long alkyl chains)...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744799/dynamic-plasmon-resonance-tuning-for-surface-enhanced-sensing
#6
Zhenhe Ma, Yafei Li, Qiongchan Gu, Sheng Hu, Yu Ying, Zhigang Li, Xiaoxiao Jiang, Jiangtao Lv
We report on fabricating plasmonic nanorod crystals using focused ion beam lithography. We first demonstrate manipulating the profiles of nanorods perpendicularly aligned with the substrate. Then we show accurate control of nanorod outlines can be achieved. We also show that it is feasible to manufacture nanorods obliquely aligned with the substrate. Tunable plasmon resonance can be realized with different tilting angles and geometries. Our approach may find important applications in plasmon-assisted sensing and surface enhanced spectroscopy...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744798/highly-sensitive-picric-acid-chemical-sensor-based-on-samarium-sm-doped-zno-nanorods
#7
Yas Al-Hadeethi, Ahmad Umar, Kulvinder Singh, Ahmed A Ibrahim, Saleh H Al-Heniti, Bahaaudin M Raffah, Andrea Cochis
Herein, we report the synthesis, characterization and picric acid chemical sensing application of samarium (Sm) doped ZnO nanorods. The Sm-doped ZnO nanorods were synthesized by facile hydrothermal process and characterized using various analytical methods which confirmed the large-scale synthesis and wurtzite hexagonal crystal structure for the synthesized nanorods. The doping of Sm ions in the lattices of the synthesized nanorods was evaluated by the energy dispersive X-ray spectroscopy (EDS). The synthesized Sm-doped ZnO nanorods were used as potential scaffold to fabricate high sensitive and reproducible picric acid chemical sensor based on I-V technique...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744797/molecular-electronics-including-temperature-effects-based-on-dyes-pigments
#8
Adriana T Amador, Abel F G Neto, Jorddy N Cruz, Fatima N B Magno, Francisco C Marques, Carlos A B Da Silva, Jordan Del Nero, Antonio M J C Neto
In this work we used the Density Functional Theory to study the thermodynamic properties from Brazilein (BZE) and Brazilin (BZI) molecules, main pigments responsible for the red color from Brazil wood. We did a comparison between the two dyes to then know which dye has better resistance to temperature (T ) and external electric field (E) values, aiming their potential to possible applications in solar cells, as excitons trainers. We have found that the BZE molecule becomes less stable after a temperature known as degradation temperature, and therefore enters oxidation state...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744796/composition-dependence-of-the-%C3%AE-phase-stability-and-mechanical-properties-of-ti-nb-thin-films
#9
Munkhbayar Baatarsukh, Joohyeon Bae, Sunchul Huh, Hyomin Jeong, Byeongkeun Choi, Gyubong Cho, Taehyun Nam, Jungpil Noh
Shape memory alloys (SMAs) are commonly used for various applications, e.g., in the aerospace and automotive industries, robotics, and biomedical sciences. Although Ti-Ni SMAs are commercially available, the low biocompatibility of Ni has stimulated research into the development of Ti-Nb based SMAs as potential replacements of Ti-Ni alloys in biomedical applications. Ti-Nb alloys have attracted attention because of their low stiffness and superelasticity. Superelastic thin films can be used in medical applications, including the fabrication of stents for neurovascular blood vessels, which relies on a thin film and on the use of a Ti-Nb alloy coating for less biocompatible alloys...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744795/the-incorporation-of-carbon-element-into-nanoporous-anodic-alumina-by-pulse-anodization
#10
Ya Wang, Hai Wang, Wei Wan
The incorporation of carbon element into nanoporous anodic aluminum oxides from oxalic acid electrolyte was studied. The carbon element content in nanoporous anodic alumina by pulse anodization reaches up to ∼20 at.%, while it remains ∼7 at.% under constant anodization. It was proposed that the ionic dynamics in nanopores governs the carbon-containing anions incorporation into nanoporous anodic oxides. For the same 20 V resting voltage, the content of carbon element remains unchanged in a broad range of working voltages: 40-150 V...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744794/response-surface-modeling-of-drug-loaded-micelles-prepared-through-supercritical-carbon-dioxide-evaporation-method-using-box-behnken-experimental-design
#11
Zhen Jiao, Xianjun Zha, Ziyi Wang, Xiudong Wang, Wenjing Fan
The nanoscale drug-loaded micelles can be prepared by the supercritical carbon dioxide evaporation method. Here, response surface methodology is used to optimize this process. The effects of pressure, ScCO₂ release rate and the volume ratio of water against ScCO₂ on the drug entrapment efficiency (EE) of the obtained micelles are discussed in detail. The obtained second-order polynomial equation can successfully predict the drug EE of the drug-loaded micelles. The maximum EE can reach 70.1% under optimal conditions in which the pressure is 12...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744793/porous-coc%C3%A2-o%C3%A2-graphene-oxide-nanocomposite-for-advanced-potassium-ion-storage
#12
Lifeng Wang, Kaiyuan Wei, Pengjun Zhang, Hong Wang, Xiujun Qi, Xuan Wu, Wei Zhao, Zhicheng Ju
Potassium-ion batteries (PIBs), as one of the alternatives to lithium-ion batteries (LIBs), have attracted considerable attention on account of the affluence and low-cost of potassium. Moreover, CoC₂O₄ and graphene oxide (GO) have been used very well in lithium-ion batteries. Hence, the hybrid CoC₂O₄/GO was investigated as a new anode material for PIBs. The hybrid CoC₂O₄/GO was synthesized by a facile and cheap method combined with supersonic dispersion. Electrochemical measurements reveal that the hybrid CoC₂O₄/GO delivered an excellent cycling stability of 166 mAh g-1 at 50 mA g-1 and a superior rate capability even at 1 A g-1 ...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744792/morphological-and-optical-characterization-of-gold-nanoparticles-decorated-porous-silicon
#13
F Severiano, V L Gayou, G García, J A Luna-López, H Martínez Gutiérrez, J A Andraca Adame, M Rojas-López
In this article, physical characteristics of porous silicon (PS) obtained by electro chemical etching using HAuCl4 in the electrolyte are described. The morphological and optical features of PS decorated with gold-nanoparticles (AuNPs) were analyzed in function of the chemical etching time. The insertion of AuNPs inside the PS were performed simultaneously with the formation of the porous silicon layer. Scanning electron microscopy (SEM) analysis showed the formation and incorporation of AuNPs with an average size of 20 nm in the PS structure, which has a pore size of 1...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744791/electrodeposited-vanadium-dioxide-films-with-unique-optical-property
#14
Hongmei Zhu, Zhengjie Zhang, Minsu Liu, Weiren Fan, Xuchuan Jiang
This study represents a facile but effective electrodeposition method to fabricate vanadium dioxide (VO₂) thin films on fluorine doped tin oxide (FTO) glass at room temperature. The film microstructure (thickness, surface structure, particle size and composition) and relevant optical properties were investigated by several advanced techniques. The pertinent variables that can affect the thin film formation and structure, such as deposition potential, time and post-treatment annealing temperature were also studied...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744790/dielectric-properties-and-thermal-conductivity-of-poly-vinylidene-fluoride-based-composites-with-graphite-nanosheet-and-nickel-particle
#15
Lirong Wu, Dandan Yang
The nickel (Ni) particles and graphite nanosheet (GNS) filled poly(vinylidene fluoride) (PVDF) composites were prepared by solution blending and hot-press processing in the magnetic field. The influence of Ni particles and GNS fillers for the structure, morphology, AC conductivity, dielectric properties and thermal conductivity of composites was investigated. The results showed that the β -phase crystals of PVDF matrix was increased obviously. The AC conductivity, dielectric constant and dielectric loss of PVDF/Ni/GNS composite reached to 10-9 s/cm, 62 and 0...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744789/surface-enhanced-raman-scattering-study-of-1-h-2-tolylazo-imidazole-taih-induced-by-uncoupled-plasmon-of-silver-nano-particles
#16
Washim Hossain, Chandana Sen, Chittaranjan Sinha, Uttam K Sarkar
Raman and SER spectra of 1-H-2 (tolylazo) imidazole (Tai H) are reported for the first time. Monomolecular layer of TaiH is formed on silver nano particles (SNPs) at a concentration of 4.93×10-6 M in Ag-sol. TaiH molecules are adsorbed on to SNPs the through the imidazole N atom and undergo trans -to- cis dark isomerization as evidenced by the appearance of signature cis -peaks and the UV-Vis absorption spectra. Stable non-aggregated SNPs are resulted by the interaction of TaiH and the particle size is significantly reduced...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744788/enhanced-photocatalytic-degradation-activity-of-2-d-graphitic-carbon-nitride-sno%C3%A2-nanohybrids
#17
Kiran Preethi Kirubakaran, Sakthivel Thangavel, Gouthami Nallamuthu, Vinesh Vasudevan, Priya Arul Selvi Ramasubramanian, Ashwini Kumar, Gunasekaran Venugopal
In this paper, we report on the facile synthesis of graphitic carbon nitride (g-C₃N₄)-tin oxide (SnO₂) nanohybrid as an efficient photocatalyst prepared via sol-gel method. SnO₂ nanoparticles are pointcontacted with g-C₃N₄. The results of physio-chemical characterizations such as SEM-EDAX, XRD, BET, FT-IR and UV-DRS spectra reveal the successful formation and integration of nanohybrid. The photocatalytic activity has been studied by using methylene-blue as a model dye for degradation. It has been observed that the pseudo-first order rate constant was increased up to 1...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744787/design-of-high-corrosion-resistant-ni-alloy-using-electronic-state-calculation
#18
Min-Sook Baek, Ki-Bok Heo, Dong-Joo Yoon, Byung-Il Kim
Ni alloys are used as the prominent industrial material for heat-resistance and corrosion-resistance. Out of them, Inconel has excellent properties for high-temperature heat-resistant equipment as an excellent material for equipment such as ultrahigh-temperature electric furnace and or boiler. However, Ni alloys used in various areas contain high-priced metals such as Ta, Nb, or Re and their use have been limited to industrial sector so far due to the price incompetence. In this study, the alloy Ni-28Cr-4Mo-2Ti was designed by electronic state calculation by replacing the expensive material of Ta and Nb in Inconel 625 with Ti...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744786/simple-combustion-synthesis-structural-morphological-optical-and-catalytic-properties-of-zno-nanoparticles
#19
S Rosy Christy, L Srimathi Priya, M Durka, A Dinesh, N Babitha, S Arunadevi
In this present study, semiconductor zinc oxide (ZnO) nanoparticles were successfully prepared by microwave irradiation (ZnO-MIM) and conventional combustion (ZnO-CCM) method, respectively using Aloe vera plant extract as reducing agent. Crystal structure, purity and surface morphology of the samples were examined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. UV-Visible diffuse reflectance (DRS) and photoluminescence (PL) spectral studies was used to analysis the optical property and band gap energy of the samples...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30744785/sound-absorption-and-insulation-properties-of-a-polyurethane-foam-mixed-with-electrospun-nylon-6-and-polyurethane-nanofibre-mats
#20
Mira Park, Hyeon Ku Park, Hye Kyoung Shin, Dawon Kang, Bishweshwar Pant, Hang Kim, Jin-Kyu Song, Hak Yong Kim
In recent years, noise has become a serious hazard and can have permanent biological and psychological effects on humans and other organisms in nature. Textile materials are commonly used as absorbent acoustic materials for noise reduction. This work examines the use of electrospun nylon-6 and polyurethane nanofibres (PU NFs) to improve the sound absorption and sound insulation properties of polyurethane foam. In this work, nylon-6 and polyurethane nanofibres were prepared by an electrospinning technique and were glued to a polyurethane foam...
June 1, 2019: Journal of Nanoscience and Nanotechnology
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