Read by QxMD icon Read

Zinc oxide

N Zahmouli, M Hjiri, L El Mir, A Bonavita, N Donato, G Neri, S G Leonardi
Ternary nanocomposites made of γ-iron oxide and aluminum-doped zinc oxide (γ-Fe2 O3 /Al-ZnO NCs), with different metal oxides ratio (0%-100%) were prepared through a solvothermal sol-gel process. The synthesized materials were characterized by x-ray diffraction, UV-vis spectroscopy, photoluminescence (PL), scanning electron microscope and BET analysis. Characterization results demonstrated that the ternary γ-Fe2 O3 /Al-ZnO NCs are mainly constituted by γ-Fe2 O3 and Al-ZnO individual phases, while structural and physical properties like surface area, pore size, optical band gap, PL and electrical conductivity were deeply affected by the composition of nanocomposite...
February 1, 2019: Nanotechnology
Xinan Zhang, Binghao Wang, Wei Huang, Gang Wang, Weigang Zhu, Zhi Wang, Weifeng Zhang, Antonio Facchetti, Tobin J Marks
Organic semiconductor-insulator blend films are widely explored for high-performance electronic devices enabled by unique phase separation and self-assembly phenomena at key device interfaces. Here we report the first demonstration of high-performance hybrid diodes based on p-n junctions formed by a p-type poly(3-hexylthiophene) (P3HT)-poly(methylmethacrylate) (PMMA) blend and n-type indium-gallium-zinc oxide (IGZO). The thin film morphology, microstructure, and vertical phase separation behavior of the P3HT films with varying contents of PMMA are systematically analyzed...
December 5, 2018: Nano Letters
Xu-Qing Wei, Xue-Peng Li, Chao-Ling Wu, Shu-Min Yi, Ke-Li Zhong, Tong Sun, Jian-Rong Li
The composite chitosan coatings were prepared and characterized to evaluate their preservation properties for silver carp fish balls, and the microstructures and physicochemical properties of the coatings were improved by in situ nano silicon oxide (SiOx) and zinc oxide/titania (ZnO/TiO2 ) nano-particles (NPs). In the chitosan coatings, when the chitosan combines with NPs by chemical bonds, the crystal lattice is slightly changed due to the modification of NPs. The chitosan coatings modified by NPs showed few cracks, among which sodium hexametaphosphate (SHMP) modified ZnO/TiO2 /SiOx-chitosan (ZTS-CS) coating is proved to be the optimal one...
December 5, 2018: Journal of Food Science
Sangyoung Kim, Jeanne H Freeland-Graves, Mahsa Babaei, Prageet K Sachdev, S Natasha Beretvas
Acute leukemia is a clonal malignant disorder that occurs when immature blast cells accumulate in bone marrow. Zinc (Zn) and copper (Cu) are related to normal lymphocyte maturation and immune function regulation. Selenium (Se) is protective against oxidative damage. The aim of this meta-analysis is to statistically synthesize results from studies that have investigated the levels of Zn, Cu, and Se in acute leukemia patients. The effect size, delta, was used to standardize the raw data. The robust variance estimation (RVE) method was performed to measure the pooled effect size and variance...
December 5, 2018: Leukemia & Lymphoma
Mengfan Wang, Weipeng Wang, Tao Qian, Sisi Liu, Yutao Li, Zhufeng Hou, John B Goodenough, Pulickel M Ajayan, Chenglin Yan
Oxidizing vacancies in nitrogen-doped carbon have recently been reported to enhance the oxygen reaction activity of air cathodes, but their specific role has remained elusive and controversial. Herein, the critical role of oxidizing the vacancies in enhancing the oxygen reduction reaction for metal-air battery is identified with density functional theory. Deliberate introduction of oxygen-enriched vacancies in nitrogen-doped carbon is shown experimentally to provide superior oxygen reduction activity. In situ X-ray powder diffraction gives direct observation of the oxygen reactions in a zinc-air battery catalyzed by vacancy-enriched oxidized carbon; the intensity changes of the carbon peak show continuous chemisorption of oxygen intermediates on the carbon cathode during discharge...
December 5, 2018: Advanced Materials
Bing Yin, Xiaomeng Liu, Hongyan Gao, Tianda Fu, Jun Yao
Biological sensory organelles are often structurally optimized for high sensitivity. Tactile hairs or bristles are ubiquitous mechanosensory organelles in insects. The bristle features a tapering spine that not only serves as a lever arm to promote signal transduction, but also a clever design to protect it from mechanical breaking. A hierarchical distribution over the body further improves the signal detection from all directions. We mimic these features by using synthetic zinc oxide microparticles, each having spherically-distributed, high-aspect-ratio, and high-density nanostructured spines resembling biological bristles...
December 4, 2018: Nature Communications
Sara Rodríguez-Menéndez, Montserrat García, Beatriz Fernández, Lydia Álvarez, Andrés Fernández-Vega-Cueto, Miguel Coca-Prados, Rosario Pereiro, Héctor González-Iglesias
Oxidative stress affects all the structures of the human eye, particularly the retina and its retinal pigment epithelium (RPE). The RPE limits oxidative damage by several protective mechanisms, including the non-enzymatic antioxidant system zinc-metallothionein (Zn-MT). This work aimed to investigate the role of Zn-MT in the protection of RPE from the oxidative damage of reactive oxygen intermediates by analytical and biochemical-based techniques. The Zn-MT system was induced in an in vitro model of RPE cells and determined by elemental mass spectrometry with enriched isotopes and mathematical calculations...
December 2, 2018: Nutrients
Juyi Guo, Xilin Wang, Zhidong Jia, Jun Wang, Chuan Chen
Recently, composite materials with nonlinear dielectric or resistive properties performed well in electric field homogenization and space charge suppression in a high voltage transmission and distribution system. For the purpose of obtaining insulation materials with desirable dielectric and electrical resistance properties, we investigated several fillers with nonlinear electrical properties doped in silicon rubber composites, and their dependency on the temperature and field. The samples of silicone rubber composites with different components were prepared using barium strontium titanate (BST) and zinc oxide (ZnO) as the filler, and high temperature vulcanized silicone rubber (SiR) as the matrix...
November 30, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Abigail Podany, Jessica Rauchut, Tong Wu, Yuka Imamura Kawasawa, Justin Wright, Regina Lamendella, David I Soybel, Shannon L Kelleher
SCOPE: Greater than 68% of young infants are exposed to dietary zinc (Zn) levels that are higher than the Tolerable Upper Intake Limit. However, the consequences of excess dietary Zn during early life on intestinal function and host-microbe interactions are unknown. METHODS AND RESULTS: Neonatal mice were gavaged with 100 Zn μg/d from post-natal day (PN) 2 through PN10 and indices of intestinal function and host-microbe interactions were compared to unsupplemented mice...
December 4, 2018: Molecular Nutrition & Food Research
Tae Soo Jung, Heesoo Lee, Hee Jun Kim, Jin Hyeok Lee, Hyun Jae Kim
We investigated a method to simultaneously improve the mobility and reliability of solution-processed zinc tin oxide thin film transistors (ZTO TFTs) using a dual-functional potassium superoxide precursor. Potassium cations in the potassium superoxide (KO2) precursor act as carrier suppliers in the ZTO thin film to improve the carrier (electron) concentration, which allows the potassium-doped ZTO TFT to exhibit high mobility. The anions in the precursor exist as superoxide radicals that reduce oxygen vacancies during the formation of thin oxide film...
December 4, 2018: ACS Applied Materials & Interfaces
Hui Yang, Yi Lu, Xiao-Feng Zeng, Ling Li, Rong-Ping Zhang, Zhong-Kun Ren, Xu Liu
Background: Baicalin (BA) has been shown to have anti-inflammatory and antioxidant activity. Zinc is a nutrient element. Objective: This study is aimed at investigating the antichronic gastric ulcer activity of Zn-Baicalin complex (BA-Zn) and its related mechanisms in an acetic acid-induced gastric ulcer rat model. Results: The severely ulcerated gastric mucosa of model rats had lower GSH-Px (52.21 ± 7.13) and SOD (7.03 ± 0.10) activity, and higher MDA (2...
2018: Gastroenterology Research and Practice
Su Hyoung Kang, Sangmin Kang, Seong Chae Park, Jong Bo Park, Youngjin Jung, Byung Hee Hong
Amorphous indium- gallium-zinc oxide (a-IGZO) has been intensively studied for the application to active matrix flat-panel display because of its superior electrical and optical properties. However, the characteristics of a-IGZO were found to be very sensitive to external circumstance such as light illumination, which dramatically degrades the device performance and stability practically required for display applications. Here, we suggest the use for silicon-germanium (Si-Ge) films grown plasma-enhanced chemical vapour deposition (PECVD) as photo-blocking layers in the a-IGZO thin film transistors (TFTs)...
December 3, 2018: Scientific Reports
Ankur Dahiya, Nadim Z Baba, Mathew T Kattadiyil, Charles J Goodacre, Akshita Mann
STATEMENT OF PROBLEM: Excess cement around dental implants is a significant cause of peri-implant inflammation. Research has focused on approaches to cement removal, the type of cement used, and the different instruments used for cement removal with titanium abutments. However, data comparing zirconia with titanium abutments are lacking. PURPOSE: The purpose of this in vitro study was to compare the effectiveness of excess cement removal from zirconia and titanium custom abutments using an explorer and to compare the effects of cement removal on the abutment surfaces...
December 1, 2018: Journal of Prosthetic Dentistry
Yugang Xue, Chuang Sun, Qimeng Hao, Jin Cheng
Coronary microembolization (CME) caused by physical obstruction in coronary microcirculation induces myocardial apoptosis and cardiac dysfunction, and it was reported that the inactivation of the Nrf2/HO-1 signaling was involved in this process. Astaxanthin (AST) is a reddish pigment that belongs to keto-carotenoids. It is also a potent antioxidant and has been reported to activate Nrf2/HO-1 signaling in vein endothelial cells. However, it is still unknown whether AST is able to activate Nrf2/HO-1 signaling pathway to protect cardiac functions from CME in vivo...
November 30, 2018: Naunyn-Schmiedeberg's Archives of Pharmacology
Marja Vilkman, Kaisa-Leena Väisänen, Pälvi Apilo, Riccardo Po, Marja Välimäki, Mari Ylikunnari, Andrea Bernardi, Tapio Pernu, Gianni Corso, Jani Seitsonen, Santtu Heinilehto, Janne Ruokolainen, Jukka Hast
Understanding the phenomena at interfaces is crucial for producing efficient and stable flexible organic solar cell modules. Minimized energy barriers enable efficient charge transfer, and good adhesion allows mechanical and environmental stability and thus increased lifetime. We utilize here the inverted organic solar module stack and standard photoactive materials (a blend of poly(3-hexylthiophene) and [6,6]-phenyl C61 butyric acid methyl ester) to study the interfaces in a pilot scale large-area roll-to-roll (R2R) process...
November 26, 2018: ACS applied energy materials
Zhiqian Wang, Xianyang Meng, Kun Chen, Somenath Mitra
The development of printable composite electrodes embedded with multiwalled carbon nanotubes (CNTs) for flexible nickel-zinc batteries is presented. The cathode and the anode comprised of Ni(OH)2 -CNT and ZnO-CNT respectively are prepared by coprecipitation of the metal oxides on CNTs. High loading ratio of electroactive materials increases the amount of active materials in electrode, but causes a lower material utilization efficiency due to decrease in overall electrode conductivity. The direct loading of active materials onto CNTs enhances contact where the CNTs serve the pathways for electron transport leading to higher performance than physical mixing of active ingredients...
February 22, 2018: Advanced Materials Interfaces
Fabiola Moreno-Olivas, Elad Tako, Gretchen J Mahler
Nano-sized zinc oxide (ZnO) is present in food packaging, putting consumers at risk of ingestion. There is little information on the amount of ZnO nanoparticles (NP) present in food packaging and the effects of ZnO NP ingestion on intestinal function. To estimate physiologically relevant ZnO NP exposures from food that are commonly packaged with ZnO NP, food samples were analyzed with inductively coupled plasma mass spectrometry (ICP-MS). An in vitro model of the small intestine was used to investigate the effects of ZnO NP exposure...
November 29, 2018: Food and Chemical Toxicology
Karla Čech Barabaszová, Sylva Holešová, Kateěrina Šulcová, Michal Ritz, Jana Kupková
The hybrid nanocomposite materials based on the vermiculite/zinc oxide-chlorhexidine were prepared in two steps. In the first step the vermiculite/zinc oxide nanocomposite was prepared by the mechanochemical method followed by a heat treatment at 650 °C for 90 min. In the second step the chlorhexidine dihydrochloride was intercalated to the vermiculite/zinc oxide nanocomposite in weight ratio 1:1, 1:2, 1:4, 2:1 and 4:1 (wt%) thereby vermiculite/zinc oxide-chlorhexidine nanocomposites were prepared. Phase analysis, crystal structure, phase transformation, chemical composition and particle size of the prepared hybrid nanocomposite materials were using X-ray diffraction methods, energy dispersive X-ray fluorescence spectroscopy, carbon phase analysis, Fourier transforms infrared spectroscopy and particle size analysis...
May 1, 2019: Journal of Nanoscience and Nanotechnology
Martin Šebesta, Marek Koleněcík, Martin Urík, Marek Bujdoš, Ivo Vávra, Edmund Dobroěcka, Jiěrí Smilek, Michal Kalina, Pavel Diviš, Milan Pavúk, Marcel Miglierini, Gabriela Kratošová, Peter Matúš
Adding the humic acid coating to the nanoparticles of zinc oxide (ZnO-NP) may improve the properties necessary for their colloidal stability. To show how humic acid coating affects the properties of ZnO-NP, three differently sol-gel synthesized ZnO-NP were synthesized: pristine zinc oxide nanoparticles without coating (p-ZnO-NP) and humic acid coated zinc oxide nanoparticles at two different initial concentrations of 20 mg/L (HA20-ZnO-NP) and 200 mg/L (HA200-ZnO-NP) of humic acids in the starting solution. All ZnO-NP were found to be nanocrystals of mineral zincite exhibiting wurtzite crystal symmetry...
May 1, 2019: Journal of Nanoscience and Nanotechnology
Karla Čech Barabaszová, Hana Rajhelová, Julie Smijová, Marianna Hundáková
Nanomaterials and nanocomposite materials on the base of zinc oxide (ZnO) are being produced and applied in our daily life at a rapid pace mainly as additives to the different polymer materials. The antibacterial behaviors of ZnO nanoparticles are intensively studied but related health and environmental toxicity assessments are lagging behind. The aim of this work was evaluated the toxic effect of self-synthesized samples (ZnO nanoparticles, vermiculite/ZnO nanocomposite) and one commercial sample of the ZnO nanoparticles, to induce oxidative stress via lipid peroxidation...
May 1, 2019: Journal of Nanoscience and Nanotechnology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"