nano zinc oxide
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2022 ◽  
Vol 184 ◽  
pp. 111757
Author(s):  
Reihaneh Aminzade ◽  
Asghar Ramezanian ◽  
Saeid Eshghi ◽  
Seyed Mohammad Hashem Hosseini

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 49
Author(s):  
Maha S. Elsayed ◽  
Inas A. Ahmed ◽  
Dina M. D. Bader ◽  
Asaad F. Hassan

In this study, zinc oxide nanoparticles (ZnO) and nanohydroxyapatite (NHAP) were prepared in the presence of date palm pits extract (DPPE) and eggshells, respectively. Another four nanocomposites were prepared from ZnO and NHAP in different ratios (ZP13, ZP14, ZP15, and ZP16). DPPE and all nanomaterials were characterized using GC-MS, zeta potentials, particle size distributions, XRD, TEM, EDX, FTIR, and pHPZC. The characterization techniques confirmed the good distribution of ZnO nanoparticles on the surface of NHAP in the prepared composites. Particles were found to be in the size range of 42.3–66.1 nm. The DPPE analysis confirmed the presence of various natural chemical compounds which act as capping agents for nanoparticles. All the prepared samples were applied in the adsorption and photocatalytic degradation of methylene blue under different conditions. ZP14 exhibited the maximum adsorption capacity (596.1 mg/g) at pH 8, with 1.8 g/L as the adsorbent dosage, after 24 h of shaking time, and the static adsorption kinetic process followed a PSO kinetic model. The photocatalytic activity of ZP14 reached 91% after 100 min of illumination at a lower MB concentration (20 mg/L), at pH 8, using 1.5 g/L as the photocatalyst dosage, at 25 °C. The photocatalytic degradation of MB obeyed the Langmuir–Hinshelwood first-order kinetic model, and the photocatalyst reusability exhibited a slight loss in activity (~4%) after five cycles of application.


2021 ◽  
Vol 54 (1) ◽  
Author(s):  
Bontle Mokone ◽  
Lebogang Ezra Motsei ◽  
Azeez Olanrewaju Yusuf ◽  
Chidozie Freedom Egbu ◽  
Taiwo Olufemi Ajayi

2021 ◽  
pp. 4406-4415
Author(s):  
Layla R. Al-Saji ◽  
Ahmed I. Al-Nazzal

    The experiment was conducted at the Agricultural Research Office in Baghdad during July 2020 to test the ability of nanomaterials (ZnO and TiO2) to inhibit  ochratoxin A, which is produced by a number of microbiology (fungi) including: Aspergillus ochraceus, A. niger, ,A. steynii, A. carbonarius,  Pencillume verrucosum and P. nordicum. The standard ochratoxin A, with known concentration, was treated with different concentrations of nanomaterials  (20, 40, 60, and 80 ppm) and two different particle sizes of nanoparticles approximately (15 nm) and (70 nm) for each (ZnO) and TiO2; with 16 transactions. Through an examination of the HPLC, the results showed that all transactions led to a noticeable inhibition in the concentration of ochratoxin A, and the highest inhibition rate was for ZnO nanoparticles with particle-size (70 nm) and 80 ppm concentration, where the inhibition rate was 99%. In other hand, the TiO2 nanoparticles with particle-sized (70 nm) and the concentration (80 ppm) were followed by 95%.


2021 ◽  
Vol 13 (4) ◽  
pp. 1552-1562
Author(s):  
C. Mohanasundar ◽  
K. Ramamoorthy ◽  
K. R. Latha ◽  
P. Santhy ◽  
C. N. Chandrasekhar ◽  
...  

A critical stage of the plant's life cycle is germination and insufficient seedling emergence contributes to the lower productivity of finger millet. Priming improves seedling emergence, reduces stand establishment time, and improves seedling germination. There is a need to develop a new technology like Nanotechnology that can precisely detect and deliver the right amount of nutrients or other inputs to safe crops for the environment and maximising productivity. A field experiment was conducted during Kharif season to evaluate the response of effective farming practice for sole finger millet + greengram intercropping system under rainfed conditions to varied levels of bio-seed priming and foliar application of nanoparticles on crop growth and productivity. The results of the experiment revealed that finger millet (Eleusine coracana) intercropped with greengram (Vigna radiata) (2:1) had a significant level (<0.05) increase in growth and yield parameter of finger millet compared to sole finger millet. Application of Prosopis juliflora leaf extract 1 per cent alone + Foliar ZnO nanoparticle @ 500 ppm showed a significant level (<0.05) increase in growth and yield parameter like grain yield (3238.84 kg ha-1), finger millet equivalent yield (FMEY) (3483.84 kg ha-1) and straw yield (7393.83 kg ha-1) compared to Pogamia pinnata leaf extract 1% alone + Foliar ZnO nanoparticle @ 500 ppm. The present study mainly focussed on cropping system, bio seed priming, and foliar application of nano zinc oxide utilized during rainfed conditions to increase uniform germination, drought resistance and improve crop yield along with nutrient content in seeds.


2021 ◽  
pp. 103627
Author(s):  
Deepro Sanjid Qais ◽  
Md Nazrul Islam ◽  
Mohd. Hafiz Dzarfan Othman ◽  
H.N.M. Ekramul Mahmud ◽  
Md. Emran Quayum ◽  
...  

2021 ◽  
Vol 947 (1) ◽  
pp. 012029
Author(s):  
Nghiem Thi Thuong ◽  
Pham Ho Anh Tu ◽  
Nguyen Hoang Trung ◽  
Dang Viet Hung ◽  
Nguyen Han Long

Abstract In this work, nano ZnO was synthesized by a simple method using a polymeric substance as a dispersing agent. Characterization of the synthesized ZnO by XRD and SEM confirmed the ZnO was nanometric in size and had a wurtzite structure. The synthesized nano ZnO was used as an activator for natural rubber vulcanization. Different amount of ZnO, 1, 2 and 3 phr, was investigated in the rubber formulation and compared to convention ZnO at a typical amount (6 phr). The sample with 3 phr nano ZnO showed the lowest curing induction time with the highest (ML-MH) at all studied temperatures. Furthermore, the rubber sample with 3 phr ZnO achieved the best properties, i.e., crosslink density, rebound resilience, and hardness compared to the rubber sample with 6 phr conventional ZnO. Interestingly, the properties of rubber sample with 2 phr nano ZnO were probably equivalent and comparable to that of 6 phr conventional ZnO. Thus, it suggested that the synthesized nano ZnO could replace the convention ZnO as an activator for rubber vulcanization even at a lower amount.


2021 ◽  
pp. 096032712110580
Author(s):  
Fang-Chuan Chen ◽  
Cong-Ming Huang ◽  
Xiao-Wan Yu ◽  
Ya-Yu Chen

Background Periodontal dressing is used to cover the gum surface and protect the wound after periodontal surgery. Nanomaterials have been widely applied in dentistry in recent years. Zinc oxide (ZnO) is one of the main components of periodontal dressing. Aim This study aims to explore the toxicity ZnO nanoparticles (ZnO NPs) causes to human gingival fibroblast cells (HGF-1) and its effect on cell proliferation. Methods First, we identified and analyzed HGF-1, including cell morphology, growth curve, and immunohistochemistry staining. Then, we treated HGF-1 with ZnO NP. Cell viability, the integrity of the cell membrane, oxidative damage, and apoptosis were measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, lactate dehydrogenase (LDH) release assay, fluorescent probe, and flow cytometry. Furthermore, the expression of murine double minute 2 (MDM2) and p53 was determined by quantitative real-time polymerase chain reaction (qPCR) and Western blotting. We finally overexpressed MDM2 in HGF-1 to verify the relationship between MDM2 and cell proliferation. Results Our research indicated ZnO NPs did not affect cell proliferation at low concentrations. However, high-concentration ZnO NP inhibited cell proliferation, destroyed the integrity of cell membranes, and induced oxidative stress and apoptosis. In addition, high concentration of ZnO NPs inhibited the proliferation of HGF-1 by regulating the expression of MDM2 and p53. Conclusion High concentration of ZnO NP caused toxicity to HGF-1 cells and inhibited cell proliferation by regulating MDM2 and p53 expression.


Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6943
Author(s):  
Yang-Ming Lu ◽  
Chi-Feng Tseng ◽  
Bing-Yi Lan ◽  
Chia-Fen Hsieh

In this study, hydrogen (H2) and methane (CH4) were used as reactive gases, and chemical vapor deposition (CVD) was used to grow single-layer graphene on a copper foil substrate. The single-layer graphene obtained was transferred to a single-crystal silicon substrate by PMMA transfer technology for the subsequent growth of nano zinc oxide. The characteristics of CVD-deposited graphene were analyzed by a Raman spectrometer, an optical microscope, a four-point probe, and an ultraviolet/visible spectrometer. The sol–gel method was applied to prepare the zinc oxide seed layer film with the spin-coating method, with methanol, zinc acetate, and sodium hydroxide as the precursors for growing ZnO nanostructures. On top of the ZnO seed layer, a one-dimensional zinc oxide nanostructure was grown by a hydrothermal method at 95 °C, using a zinc nitrate and hexamethylenetetramine mixture solution. The characteristics of the nano zinc oxide were analyzed by scanning electron microscope(SEM),x-ray diffractometer(XRD), and Raman spectrometer. The obtained graphene/zinc oxide nano-heterostructure sensor has a sensitivity of 1.06 at a sensing temperature of 205 °C and a concentration of hydrogen as low as 5 ppm, with excellent sensing repeatability. The main reason for this is that the zinc oxide nanostructure has a large specific surface area, and many oxygen vacancy defects exist on its surface. In addition, the P–N heterojunction formed between the n-type zinc oxide and the p-type graphene also contributes to hydrogen sensing.


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