scholarly journals Recyclable, Antibacterial, Isoporous Through-Hole Membrane Air Filters with Hydrothermally Grown ZnO Nanorods

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3381
Author(s):  
Yong Ho Choi ◽  
Moon-Ju Kim ◽  
Jia Lee ◽  
Jae-Chul Pyun ◽  
Dahl-Young Khang
Keyword(s):  
High Temperature ◽  
Membrane Surface ◽  
Zno Nanorods ◽  
Air Filtration ◽  
Seed Formation ◽  
Concurrent Control ◽  
Membrane Filters ◽  
Filtration Membranes ◽  
Uv Illumination ◽  
Through Hole

Reusable, antibacterial, and photocatalytic isoporous through-hole air filtration membranes have been demonstrated based on hydrothermally grown ZnO nanorods (NRs). High-temperature (300~375 °C) stability of thermoset-based isoporous through-hole membranes has enabled concurrent control of porosity and seed formation via high-temperature annealing of the membranes. The following hydrothermal growth has led to densely populated ZnO NRs on both the membrane surface and pore sidewall. Thanks to the nanofibrous shape of the grown ZnO NRs on the pore sidewall, the membrane filters have shown a high (>97%) filtration efficiency for PM2.5 with a rather low-pressure (~80 Pa) drop. The membrane filters could easily be cleaned and reused many times by simple spray cleaning with a water/ethanol mixture solution. Further, the grown ZnO NRs have also endowed excellent bactericidal performance for both Gram-positive S. aureus and Gram-negative S. enteritidis bacteria. Owing to the wide bandgap semiconductor nature of ZnO NRs, organic decomposition by photocatalytic activity under UV illumination has been successfully demonstrated. The reusable, multifunctional membrane filters can find wide applications in air filtration and purification.

scholarly journals Rising Atmospheric Temperature Impact on Wheat and Thermotolerance Strategies

Plants ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 43
Author(s):  
Adeel Khan ◽  
Munir Ahmad ◽  
Mukhtar Ahmed ◽  
M. Iftikhar Hussain
Keyword(s):  
High Temperature ◽  
Industrial Revolution ◽  
Foliar Application ◽  
Pollen Viability ◽  
Grain Filling ◽  
Crop Productivity ◽  
Potassium Nitrate ◽  
Agricultural Crop ◽  
Stay Green ◽  
Seed Formation

Temperature across the globe is increasing continuously at the rate of 0.15–0.17 °C per decade since the industrial revolution. It is influencing agricultural crop productivity. Therefore, thermotolerance strategies are needed to have sustainability in crop yield under higher temperature. However, improving thermotolerance in the crop is a challenging task for crop scientists. Therefore, this review work was conducted with the aim of providing information on the wheat response in three research areas, i.e., physiology, breeding, and advances in genetics, which could assist the researchers in improving thermotolerance. The optimum temperature for wheat growth at the heading, anthesis, and grain filling duration is 16 ± 2.3 °C, 23 ± 1.75 °C, and 26 ± 1.53 °C, respectively. The high temperature adversely influences the crop phenology, growth, and development. The pre-anthesis high temperature retards the pollen viability, seed formation, and embryo development. The post-anthesis high temperature declines the starch granules accumulation, stem reserve carbohydrates, and translocation of photosynthates into grains. A high temperature above 40 °C inhibits the photosynthesis by damaging the photosystem-II, electron transport chain, and photosystem-I. Our review work highlighted that genotypes which can maintain a higher accumulation of proline, glycine betaine, expression of heat shock proteins, stay green and antioxidant enzymes activity viz., catalase, peroxidase, super oxide dismutase, and glutathione reductase can tolerate high temperature efficiently through sustaining cellular physiology. Similarly, the pre-anthesis acclimation with heat treatment, inorganic fertilizer such as nitrogen, potassium nitrate and potassium chloride, mulches with rice husk, early sowing, presoaking of a 6.6 mM solution of thiourea, foliar application of 50 ppm dithiothreitol, 10 mg per kg of silicon at heading and zinc ameliorate the crop against the high temperature. Finally, it has been suggested that modern genomics and omics techniques should be used to develop thermotolerance in wheat.

Synthesis of ZnO nanorods by a hot-wall high-temperature laser deposition process

2005 ◽  
Vol 276 (1-2) ◽  
pp. 171-176 ◽  
Author(s):  
Jae-Hwan Park ◽  
In-Sung Hwang ◽  
Young-Jin Choi ◽  
Jae-Gwan Park
Keyword(s):  
High Temperature ◽  
Zno Nanorods ◽  
Deposition Process ◽  
Laser Deposition

scholarly journals Фотолюминесцентные свойства нанородов ZnO, синтезированных различными методами

2018 ◽  
Vol 52 (7) ◽  
pp. 757
Author(s):  
С.С. Курбанов ◽  
Ш.З. Уролов ◽  
З.Ш. Шаймарданов ◽  
Х.Д. Чо ◽  
Т.В. Канг
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Vapor Phase ◽  
Zno Nanorods ◽  
Luminescence Spectra ◽  
Phase Method ◽  
Interstitial Oxygen ◽  
Chemical Reagents ◽  
Yellow Orange ◽  
High Temperature Vapor

AbstractThe photoluminescence properties of ZnO nanorods synthesized by the low-temperature hydrothermal and high-temperature vapor-phase methods are studied. At room temperature, the photoluminescence of ZnO nanorods synthesized by the high-temperature vapor-phase method exhibits only one highintensity ultraviolet peak at a wavelength of 382 nm. At the same time, the luminescence spectra of ZnO nanorod samples grown by the low-temperature hydrothermal method, but with the use of different chemical reagents exhibit, apart from the ultraviolet peak, a violet band or a yellow-orange band at ~401 and ~574 nm, respectively. The violet luminescence band is attributed to defects or zinc vacancy complexes, and the yellow-orange band to defects associated with interstitial oxygen.

Pressure drop prediction of ceramic membrane filters at high temperature

2020 ◽  
Vol 364 ◽  
pp. 647-653
Author(s):  
Rui Xiong ◽  
Guangchao Sun ◽  
Kaikai Si ◽  
Qingzhu Liu ◽  
Kaiqi Liu
Keyword(s):  
High Temperature ◽  
Pressure Drop ◽  
Ceramic Membrane ◽  
Membrane Filters

scholarly journals Characterization of Ag/ZnO Nanorod Schottky Diode-Based Low-Voltage Ultraviolet Photodetector

NANO ◽  
2017 ◽  
Vol 12 (05) ◽  
pp. 1750063 ◽  
Author(s):  
Shaivalini Singh ◽  
S. Jit ◽  
Si-Hyun Park
Keyword(s):  
Indium Tin Oxide ◽  
Low Voltage ◽  
Zno Nanorods ◽  
Contrast Ratio ◽  
Cost Effective ◽  
Hexagonal Structure ◽  
Schottky Contacts ◽  
Uv Detection ◽  
Glass Substrates ◽  
Uv Illumination

Ultraviolet (UV) detection characteristics of Ag Schottky contacts with ZnO nanorods (ZnO-NRs) grown on Indium Tin Oxide (ITO)-coated glass substrates have been investigated. A low-temperature hydrothermal method was used for growing ZnO-NRs. Circular contacts of Ag were deposited above the ZnO-NRs/ITO samples using the shadow mask technique. The structural properties of the ZnO-NRs were characterized by using scanning electron microscopy (SEM), atomic force microscope (AFM) and X-ray diffraction (XRD). The results revealed a (0002) crystal orientation and a wurtzite hexagonal structure. The electrical characteristics of the Ag/ZnO-NR Schottky contacts were studied at forward applied bias over the range 0[Formula: see text]V to 1[Formula: see text]V, under dark and UV illumination. The dark and photocurrents were [Formula: see text][Formula: see text]A and [Formula: see text][Formula: see text]A, respectively, and the contrast ratio (ratio of photocurrent to dark current) was 1.67 at [Formula: see text]1.0[Formula: see text]V for these devices. The results show that these devices could be useful for cost-effective and low-voltage UV detection applications.

scholarly journals High temperature carrier controlled ferromagnetism in alkali doped ZnO nanorods

2009 ◽  
Vol 106 (11) ◽  
pp. 113923 ◽  
Author(s):  
Santa Chawla ◽  
K. Jayanthi ◽  
R. K. Kotnala
Keyword(s):  
High Temperature ◽  
Zno Nanorods ◽  
Doped Zno

scholarly journals Influence ofIn SituOxide Dissolution on the Bottom Morphologies of Detached TiO2Nanotube Films

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Jia Lin ◽  
Xiaolin Liu ◽  
Shu Zhu ◽  
Yongsheng Liu ◽  
Xianfeng Chen
Keyword(s):  
High Temperature ◽  
Significant Influence ◽  
Chemical Etching ◽  
Chemical Dissolution ◽  
Free Standing ◽  
Practical Applications ◽  
Detachment Rate ◽  
Variable Bottom ◽  
Through Hole

Free-standing TiO2nanotube (NT) films with through holes (i.e., open bottoms) are useful for various applications. In this paper, we report the significant influence ofin situchemical etching during the detachment process on the morphological variation of TiO2NT bottoms. Under a high temperature detachment anodization, we noted a high detachment rate with controllable bottom morphologies. Influenced by anodization durations, the bottom opening size could be controlled with morphology transition changing from closed to partially open and then to fully open bottoms. The underlying formation mechanism of variable bottom conditions has been examined through the consideration of field-assisted chemical dissolution of both the barrier layer and the sides of the tubes at the bottom. The production of well-defined through-hole tube membranes in a reliable and controllable way is essential for their practical applications.

Sign in / Sign up

Export Citation Format

Share Document