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https://read.qxmd.com/read/30784969/novel-nanocomposite-derived-from-zno-cds-qds-embedded-crosslinked-chitosan-an-efficient-photocatalyst-and-effective-antibacterial-agent
#1
Lipi Midya, Abhay Shankar Patra, Chranjib Banerjee, Asit Baran Panda, Sagar Pal
A novel nanocomposite (cl-Ch-pMAc@ZnO/CdSQDs) has been developed under microwave irradiation via fabrication of ZnO/CdS quantum dots on anionically functionalized chitosan [i.e. poly (methacrylic acid) crosslinked chitosan (cl-Ch-pMAc) in the presence of diethylene glycol dimethacrylate (DEGDMA) crosslinker]. The structural, morphological and chemical/physical properties of crosslinked chitosan and the nanocomposites have been investigated using 13 C nuclear magnetic resonance spectroscopy (13 C NMR spectroscopy), high resolution-transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) analyses...
February 10, 2019: Journal of Hazardous Materials
https://read.qxmd.com/read/30784464/three-dimensional-biogenic-c-doped-bi-2-moo-6-in-2-o-3-zno-z-scheme-heterojunctions-derived-from-a-layered-precursor
#2
Hongyan Li, Jia Li, Ping Yang, Dickon H L Ng, Xinling Cui, Fei Ji
Novel 3D biogenic C-doped Bi2 MoO6 /In2 O3 -ZnO Z-scheme heterojunctions were synthesized for the first time, using cotton fiber as template. The as-prepared samples showed excellent adsorption and photodegradation performance toward the hazardous antibiotic doxycycline under simulated sunlight irradiation. The morphology, phase composition and in situ carbon doping could be precisely controlled by adjusting processing parameters. The carbon doping in Bi2 MoO6 /In2 O3 -ZnO was derived from the cotton template, and the carbon content could be varied in the range 0...
May 2019: Journal of Environmental Sciences (China)
https://read.qxmd.com/read/30782517/multifunctional-zno-nps-chitosan-gallic-acid-hybrid-nanocoating-to-overcome-contact-lenses-associated-conditions-and-discomfort
#3
Javier Hoyo, Kristina Ivanova, Ester Guaus, Tzanko Tzanov
Contact lenses (CL) provide visual correction but their use may also induce several adverse effects causative of discomfort and conditions that lead to stop or discontinue their use. Discomfort is mainly caused by insufficient wetting, impairment of the antioxidant defence system and eye infections. The current work reports on a single step sonochemical coating of CL with ZnO nanoparticles (NPs), chitosan (CS) and gallic acid (GA). GA and CS are expected to improve the comfort of CL by imparting respectively antioxidant properties and enhanced wettability, while their combination with ZnO NPs provides the CL with antimicrobial properties...
February 13, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30781799/co%C3%A2-o%C3%A2-al-zno-nano-composites-gas-sensing-properties
#4
Ada Fort, Enza Panzardi, Valerio Vignoli, Mokhtar Hjiri, Mohamed Salah Aida, Marco Mugnaini, Tommaso Addabbo
In this paper, the gas sensing properties of metal oxide nano-powder composites are studied and modeled. The gas sensing properties of mixtures of two different metal oxide nanoparticles, prepared via low-cost routes, are investigated. The responses to both an oxidizing (NO₂) and a reducing gas (CO) are analyzed. The tested composites are obtained by mixing a different percentage of a p-type metal oxide, Co₃O₄, with moderate responses to NO₂ at about 200 °C and to CO at high temperature (above 260 °C), with n-type Al-doped ZnO, which is characterized by a large but unstable response towards NO₂ around 160 °C and a moderate response towards CO around 200 °C...
February 13, 2019: Sensors
https://read.qxmd.com/read/30781598/highly-sensitive-impact-sensor-based-on-pvdf-trfe-nano-zno-composite-thin-film
#5
Jing Han, Dong Li, Chunmao Zhao, Xiaoyan Wang, Jie Li, Xinzhe Wu
A thin film of polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) has good flexibility and simple preparation process. More importantly, compared with PVDF, its piezoelectric β-phase can be easily formed without mechanical stretching. However, its piezoelectricity is relatively lower. Therefore, at present, PVDF-TrFE is always compounded with other kinds of piezoelectric materials to solve this problem. The effect of nano-ZnO doping amount on the sensing characteristics of the piezoelectric films was studied...
February 18, 2019: Sensors
https://read.qxmd.com/read/30780140/electrical-characterization-of-zno-coated-nanospring-ensemble-by-impedance-spectroscopy-probing-the-effect-of-thermal-annealing
#6
Lyndon Bastatas, Phadindra Wagle, Elena Echeverria, Jason D Slinker, Dave N McIlroy
The effects of thermal annealing on the electrical properties of the randomly oriented ZnO-coated nanospring ensembles were extensively investigated through AC impedance spectroscopy. Annealing the nanospring mats for an hour at 873 K in air showed significant change in ZnO morphology, reduced electrical conductivity due to the presence of grain boundaries, decreased apparent donor concentration, and faster decay of sub-band gap photocurrent. The role of the nanospring-nanospring junctions in the conduction of carriers in the ensemble was also examined, as well as evaluation of their responsiveness to thermal and optical stimulation...
February 19, 2019: Nanotechnology
https://read.qxmd.com/read/30778562/effects-of-palygorskite-composites-on-growth-performance-and-antioxidant-status-in-broiler-chickens
#7
Rui Yan, Aiping Hui, Yuru Kang, Yanming Zhou, Aiqin Wang
This work aimed to investigate the effects of the palygorskite (PAL) composites on the growth performance and antioxidant status in broiler chickens. A total of 192 one-day-old Ross 308 broilers were randomly divided into 3 treatment groups. Broilers were fed basal diets supplemented with either 50 mg/kg chlortetracycline (CTC group), 1 g/kg ZnO/PAL (ZnO/PAL group), or 1 g/kg chitooligosaccharides/ZnO/PAL (COS/ZnO/PAL group), respectively. The results showed that PAL composites were found to exhibit similar effects on growth performance as CTC (P > 0...
February 19, 2019: Poultry Science
https://read.qxmd.com/read/30774924/one-dimensional-vs-two-dimensional-proton-transport-processes-at-solid-liquid-zinc-oxide-water-interfaces
#8
Matti Hellström, Vanessa Quaranta, Jörg Behler
Long-range charge transport is important for many applications like batteries, fuel cells, sensors, and catalysis. Obtaining microscopic insights into the atomistic mechanism is challenging, in particular if the underlying processes involve protons as the charge carriers. Here, large-scale reactive molecular dynamics simulations employing an efficient density-functional-theory-based neural network potential are used to unravel long-range proton transport mechanisms at solid-liquid interfaces, using the zinc oxide-water interface as a prototypical case...
January 28, 2019: Chemical Science
https://read.qxmd.com/read/30772415/facile-and-rapid-in-situ-synthesis-of-chitosan-zno-nano-hybrids-applicable-in-medical-purposes-a-novel-combination-of-biomineralization-ultrasound-and-bio-safe-morphology-conducting-agent
#9
Erfan Zabihi, Amir Babaei, Dina Shahrampour, Zahra Arab-Bafrani, Kiana S Mirshahidi, Hoomaan Joz Majidi
In this study, zinc oxide nanoparticle (ZnO-NPs) and also chitosan‑zinc oxide (CS-ZnO-NPs) nano-hybrid were synthesized by a rapid ultrasound assisted co-precipitation method. The morphology, chemical bonding, crystal structure, UV absorption, toxicity and antibacterial properties of the CS-ZnO-NPs and ZnO-NPs were characterized. The FE-SEM (field emission scanning electron microscopy) micrographs and X-ray diffraction (XRD) analysis revealed that the used technique led to the preparation of homogeneous, ultra-thin (thickness of 20-30 nm) and highly pure ZnO sheets for the both kinds of nanoparticles...
February 14, 2019: International Journal of Biological Macromolecules
https://read.qxmd.com/read/30771391/preparation-of-chitosan-coated-zinc-oxide-nanocomposite-for-enhanced-antibacterial-and-photocatalytic-activity-as-a-bionanocomposite
#10
Devaraj Bharathi, R Ranjithkumar, B Chandarshekar, V Bhuvaneshwari
The surface coating of metal oxide nanoparticles using biopolymer chitosan has evolved to become an important area of polymer nanotechnology. Herein, we report the preparation of chitosan coated zinc oxide (CS-ZnO) nanocomposite for the first time by a green chemistry approach using bioflavonoid rutin. The formation of CS-ZnO nanocomposite was preliminarily confirmed by color change and UV-Visible spectroscopy. FE-SEM images revealed agglomeration of CS-ZnO nanocomposite having predominant rod shaped structure...
February 13, 2019: International Journal of Biological Macromolecules
https://read.qxmd.com/read/30769339/large-area-patterning-of-residue-free-metal-oxide-nanostructures-by-liquid-transfer-imprint-lithography
#11
Suok Lee, Sang Hee Jung, A-Rang Jang, Seong In Yoon, Hyeon Suk Shin, Hyun Uk Lee, Jaejong Lee
One-dimensional and three-dimensional residue-free metal oxide patterns are directly fabricated over large areas using liquid transfer imprint lithography (LTIL) with an ultraviolet (UV)-curable metal oxide precursor resist. A one-dimensional line or pillar array of metal oxides nano-patterns without a residual layer is formed by LTIL and annealing processes. A three-dimensional layer-by-layer nanomesh structure is successfully constructed by repeating the LTIL method without a complex etching process. In addition, it is possible to form a hierarchical structure in which zinc oxide nanowires are selectively grown on a desired zinc oxide (ZnO) seed pattern formed by LTIL via a hydrothermal method...
February 15, 2019: Nanotechnology
https://read.qxmd.com/read/30767075/high-methanol-gas-sensing-performance-of-sm-2-o-3-zno-smfeo-3-microspheres-synthesized-via-a-hydrothermal-method
#12
Kun Li, Yinzhen Wu, Mingpeng Chen, Qian Rong, Zhongqi Zhu, Qingju Liu, Jin Zhang
In this work, we synthesized Sm2 O3 /ZnO/SmFeO3 microspheres by a hydrothermal method combined with microwave assistance to serve as a methanol gas sensor. We investigated the effect on the microstructure at different hydrothermal times (12 h, 18 h, 24 h, and 30 h), and the BET and XPS results revealed that the specific surface area and adsorbed oxygen species were consistent with a microstructure that significantly influences the sensing performance. The gas properties of the Sm2 O3 -doped ZnO/SmFeO3 microspheres were also investigated...
February 14, 2019: Nanoscale Research Letters
https://read.qxmd.com/read/30766660/zinc-oxide-nanoparticles-exhibit-both-cyclooxygenase-and-lipoxygenase-mediated-apoptosis-in-human-bone-marrow-derived-mesenchymal-stem-cells
#13
Dong-Yung Kim, Jun-Hyung Kim, Jae-Chul Lee, Moo-Ho Won, Se-Ran Yang, Hyoung-Chun Kim, Myung-Bok Wie
Nanoparticles (NPs) have been recognized as both useful tools and potentially toxic materials in various industrial and medicinal fields. Previously, we found that zinc oxide (ZnO) NPs that are neurotoxic to human dopaminergic neuroblastoma SH-SY5Y cells are mediated by lipoxygenase (LOX), not cyclooxygenase-2 (COX-2). Here, we examined whether human bone marrow-derived mesenchymal stem cells (MSCs), which are different from neuroblastoma cells, might exhibit COX-2- and/or LOX-dependent cytotoxicity of ZnO NPs...
January 2019: Toxicological Research
https://read.qxmd.com/read/30765002/carbon-black-and-titanium-interlayers-between-zinc-oxide-photo-electrode-and-fluorine-doped-tin-oxide-for-dye-sensitized-solar-cells
#14
Su Young Lee, Soo Ho Cho, Yoo Shin Cho, Sung Joon Kim, Sang Ho Kim
Carbon black and titanium interlayers were deposited on fluorine-doped tin oxide (FTO) anode layers using radio frequency magnetron sputtering method. On top of them, Zinc oxide (ZnO) photo anode layers were prepared using plasma enhanced chemical vapor deposition technique. ZnO high binding energy as well as good breakdown strength, cohesion, and stability used as a photo electrode material for dye-sensitized solar cells (DSSC), but it does not have a good electrical contact to the FTO anode. To solve this problem, the carbon black and titanium interlayers were deposited...
July 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30764993/ytterbium-doped-zno-flowers-based-phenyl-hydrazine-chemical-sensor
#15
Yas Al-Hadeethi, Ahmad Umar, Kulvinder Singh, Ahmed A Ibrahim, Saleh H Al-Heniti, Bahaaudin M Raffah
Herein, we report the fabrication and characterization of phenyl hydrazine sensor based on ytterbium (Yb) doped ZnO flowers composed of nanorods prepared by simple hydrothermal process. The as-synthesized nanomaterial was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) attached with energy dispersive spectroscopy (EDS), Fourier transformation infrared (FTIR) and Raman-scattering spectroscopy which revealed the large-quantity synthesis, well-crystallinity and wurtzite hexagonal crystal structure of Yb-doped ZnO flowers...
July 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30764971/synthesis-of-superparamagnetic-znfe%C3%A2-o%C3%A2-core-ag-deposited-zno-shell-nanodiscs-for-application-as-visible-light-photocatalyst
#16
C Karunakaran, I JebaSing, P Vinayagamoorthy
Nanodiscs with ZnFe₂O₄ core and Ag-deposited ZnO shell have been synthesized by hydrothermal method. Scanning electron microscopy (SEM) shows the morphology as nanodiscs. X-ray diffractometry (XRD), selected area electron diffractometry (SAED) and Raman spectroscopy reveal cubic ZnFe₂O₄, hexagonal ZnO and face centered cubic Ag as the constituents of the synthesized nanodiscs. Energy dispersive X-ray spectroscopy (EDS) provides the atomic percentage of Ag as 0.6. High resolution transmission electron microscopy (HRTEM) displays the core-shell structure of the synthesized nanodiscs...
July 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30764962/fabrication-of-bi%C3%A2-moo-6-zno-heterojunction-nanosheet-array-with-high-photoelectrochemical-property
#17
Yulong Jia, Ying Ma, Yinhe Lin, Jinzhu Tang, Wenbing Shi
Herein, we demonstrate the synthesis of Bi₂MoO6 nanosheet array followed with in-situ electrodepositing ZnO layer, resulting in Bi₂MoO6 /ZnO heterojunction nanosheet array. The thickness of nanoparticle-based ZnO layer on the surface of Bi₂MoO6 nanosheets can be rational controlled by regulating the electrodepositing time. The combination of oriented Bi₂MoO6 nanosheet array and ZnO layer could not only enhance the conductivity and surface area but also facilitate the charge separation. As expected, the heterojunction electrode yields a photocurrent density of 430 µ A/cm² at 0...
July 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30764959/antibacterial-nanorods-made-of-carbon-quantum-dots-zno-under-visible-light-irradiation
#18
Weicong Kuang, Qing Zhong, Xiaoli Ye, Yayuan Yan, Yunhua Yang, Jingxian Zhang, Langhuan Huang, Shaozao Tan, Qingshan Shi
Due to secondary pollution from bactericidal substances, the importance of eliminating microbial contamination has become a controversial topic. Three antibacterial nanorod materials of carbon quantum dots-zinc oxide (1/3CQDs-ZnO, CQDs-ZnO, and 2CQDs-ZnO), in which ZnO nanorods are surrounded by carbon quantum dots (CQDs), were successful prepared via in-situ sol-gel chemistry. Antibacterial nanorods of CQDs-ZnO had strong antibacterial activity under visible light irradiation, and a concentration of 0.1 mg/L was able to kill more than 96% of bacteria...
July 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30764951/corrosion-resistance-of-zno-nanorod-superhydrophobic-coatings-with-rose-petal-effect-or-lotus-leaf-effect
#19
De-Lin Lai, Gang Kong, Xiao-Cong Li, Chun-Shan Che
Superhydrophobic ZnO nanorods coatings with a strong adhesive force to the surface (rose petal effect) or a low sliding angle (lotus leaf effect) were fabricated on the zinc plate by the hydrothermal plus sol-gel method. The corrosion resistance and durability of the superhydrophobic coatings in 5 wt% NaCl solution were investigated. The coating with loose ZnO nanostructure on ZnO nanorods shows a high adhesive force to water with low corrosion resistance, while the coating with a layer of dense nanotubes on nanorods exhibits a low adhesive to water with a high corrosion resistance due to a layer of trapped air among micro/nanostructures, which can delay the penetration of corrosive media...
July 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30764948/thermo-optical-properties-of-cobalt-doped-zinc-oxide-zno-nanorods
#20
Amrit Kaphle, Elena Echeverria, David N Mcllroy, Kenneth Roberts, Parameswar Hari
Thermo-optical and structural properties of cobalt-doped zinc oxide (ZnO) nanorods grown by chemical bath deposition were investigated. The average nanorods diameter was found to increase with cobalt doping. X-ray diffraction (XRD), Raman, and Fourier Transform Infrared (FTIR) analysis confirm the substitution of cobalt into ZnO lattice without forming any impurities at higher doping and preserving the hexagonal wurtzite structure. Variations in the absorption spectrum, band gap, photoluminescence, electronic structure by X-ray photoelectron spectroscopy (XPS), and index of refraction were analyzed at different cobalt doping levels and annealing temperatures...
July 1, 2019: Journal of Nanoscience and Nanotechnology
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