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排序方式: 共有181条查询结果,搜索用时 15 毫秒
41.
Mohammad B. Ghasemian Mohannad Mayyas Shuhada A. Idrus‐Saidi Muhammad A. Jamal Jiong Yang Sajjad S. Mofarah Esmaeil Adabifiroozjaei Jianbo Tang Nitu Syed Anthony P. O'Mullane Torben Daeneke Kourosh Kalantar‐Zadeh 《Advanced functional materials》2019,29(36)
Liquid metals offer unprecedented chemistry. Here it is shown that they can facilitate self‐limiting oxidation processes on their surfaces, which enables the growth of metal oxides that are atomically thin. This claim is exemplified by creating atomically thin hydrated MnO2 using a Galvanic replacement reaction between permanganate ions and a liquid gallium–indium alloy (EGaIn). The “liquid solution”–“liquid metal” process leads to the reduction of the permanganate ions, resulting in the formation of the oxide monolayer at the interface. It is presented that under mechanical agitation liquid metal droplets are established, and simultaneously, hydrated gallium oxides and manganese oxide sheets delaminate themselves from the interfacial boundaries. The produced nanosheets encapsulate a metallic core, which is found to consist of solid indium only, with the full migration of gallium out of the droplets. This process produces core/shell structures, where the shells are made of stacked atomically thin nanosheets. The obtained core/shell structures are found to be an efficient photocatalyst for the degradation of an organic dye under simulated solar irradiation. This study presents a new research direction toward the modification and functionalization of liquid metals through spontaneous interfacial redox reactions, which has implications for many applications beyond photocatalysis. 相似文献
42.
Sonication‐Assisted Synthesis of Gallium Oxide Suspensions Featuring Trap State Absorption: Test of Photochemistry
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Nitu Syed Ali Zavabeti Md Mohiuddin Baoyue Zhang Yichao Wang Robi S. Datta Paul Atkin Benjamin J. Carey Cheng Tan Joel van Embden Anthony S. R. Chesman Jian Zhen Ou Torben Daeneke Kourosh Kalantar‐zadeh 《Advanced functional materials》2017,27(43)
Gallium is a near room temperature liquid metal with extraordinary properties that partly originate from the self‐limiting oxide layer formed on its surface. Taking advantage of the surface gallium oxide (Ga2O3), this work introduces a novel technique to synthesize gallium oxide nanoflakes at high yield by harvesting the self‐limiting native surface oxide of gallium. The synthesis process follows a facile two‐step method comprising liquid gallium metal sonication in DI water and subsequent annealing. In order to explore the functionalities of the product, the obtained hexagonal α‐Ga2O3 nanoflakes are used as a photocatalytic material to decompose organic model dyes. Excellent photocatalytic activity is observed under solar light irradiation. To elucidate the origin of these enhanced catalytic properties, the electronic band structure of the synthesized α‐Ga2O3 is carefully assessed. Consequently, this excellent photocatalytic performance is associated with an energy bandgap reduction, due to the presence of trap states, which are located at ≈1.65 eV under the conduction band minimum. This work presents a novel route for synthesizing oxide nanostructures that can be extended to other low melting temperature metals and their alloys, with great prospects for scaling up and high yield synthesis. 相似文献
43.
Momeni Marzieh Behzadian Kourosh Yousefi Hossein Zahedi Sina 《Water Resources Management》2021,35(12):4233-4250
Water Resources Management - Long-term sustainability in water supply systems is a major challenge due to water resources depletion, climate change and population growth. This paper presents a... 相似文献
44.
Mehdi Fazlzadeh Kourosh Rahmani Ahmad Zarei Hossein Abdoallahzadeh Fakhraddin Nasiri Rasoul Khosravi 《Advanced Powder Technology》2017,28(1):122-130
In the present study, NZVI particles were synthesized from the plant extracts including Rosa damascene (RD), Thymus vulgaris (TV), and Urtica dioica (UD). The FTIR arspectshowed that polyphenols, proteins and organic acids which serve as reducing and stabilizing agents play a significant role in the synthesis of NPs and reduce the possibility of aggregation of NPs compared to chemical techniques of NPs synthesis. The amount and type of compounds in plant extracts affect the structure and also agglomeration of NPs after adsorption process. Based on the results, the highest removal efficiency occurred at pH 2. With increase in contact time and amount of dose, the percentage removal increases. Inversely, increase of initial concentration of Cr(VI) decreases the removal efficiency of the contaminant. These nanoparticles have a high adsorption capacity. Accordingly, by applying a dose of 0.2 g/l and contact time of 10 min, the three NPs yielded >90% removal efficiency. Also, for 1 min contact time, the percentage removal was 94.87%, 83.48% and 86.8% for RD-Fe, UD-Fe and TV-Fe, respectively. By an increase to 25 min, the removal percentage reached to 100% for TV-Fe and UD-Fe. Moreover, 30 min was required to remove Cr(VI) completely by RD-F. 相似文献
45.
OR Spectrum - Efficient location of medical services is an issue of paramount importance in healthcare strategic planning. In this research, a mathematical model is developed for the location of... 相似文献
46.
Dr. Kourosh Honarmand Ebrahimi Dr. Jack S. Rowbotham Prof. James McCullagh Prof. William S. James 《Chembiochem : a European journal of chemical biology》2020,21(11):1605-1612
3′-Deoxynucleotides are an important class of drugs because they interfere with the metabolism of nucleotides, and their incorporation into DNA or RNA terminates cell division and viral replication. These compounds are generally produced by multi-step chemical synthesis, and an enzyme with the ability to catalyse the removal of the 3′-deoxy group from different nucleotides has yet to be described. Here, using a combination of HPLC, HRMS and NMR spectroscopy, we demonstrate that a thermostable fungal radical S-adenosylmethionine (SAM) enzyme, with similarity to the vertebrate antiviral enzyme viperin (RSAD2), can catalyse the transformation of CTP, UTP and 5-bromo-UTP to their 3′-deoxy-3′,4′-didehydro (ddh) analogues. We show that, unlike the fungal enzyme, human viperin only catalyses the transformation of CTP to ddhCTP. Using electron paramagnetic resonance spectroscopy and molecular docking and dynamics simulations in combination with mutagenesis studies, we provide insight into the origin of the unprecedented substrate promiscuity of the enzyme and the mechanism of dehydration of a nucleotide. Our findings highlight the evolution of substrate specificity in a member of the radical-SAM enzymes. We predict that our work will help in using a new class of the radical-SAM enzymes for the biocatalytic synthesis of 3′-deoxy nucleotide/nucleoside analogues. 相似文献
47.
48.
Mohammad Sabet Majid Ramezani Kourosh Motevalli Masoud Salavati-Niasari Omid Amiri 《Journal of Materials Science: Materials in Electronics》2017,28(3):2427-2434
In this experimental work, different morphologies of CuGaS2/CuS nanostructures were synthesized via a simple ultrasonic method. The effect of different parameters was investigated on the product size and morphology, such as copper source, sulfur source, ultrasonic power and time, solvent and the reaction vessel. It was found the mentioned parameters have significant effects on the product size and morphology. The obtained products were characterized by X-ray diffraction pattern to study the product structure and scanning electron microscopy was used to study the products morphologies. 相似文献
49.
50.
Cheniany Alireza Hasan Khoshrou Seyed Shahriar Kourosh Khademi Hamidi Jafar 《中国矿业大学学报(英文版)》2012,22(2)
The main purpose of the present study was to provide a practical,convenient drillability prediction model based on rock mass characteristics,geological sampling from blast holes,and drill operational f... 相似文献