scholarly journals Synthesis of nanoparticles of zeolitic imidazolate framework ZIF-94 using inorganic deprotonators

2020 ◽  
Vol 44 (46) ◽  
pp. 20449-20457
Author(s):  
Dharmjeet Madhav ◽  
Magdalena Malankowska ◽  
Joaquín Coronas
Keyword(s):  
Particle Size ◽  
Synthesis Process ◽  
Zeolitic Imidazolate Framework ◽  
Synthesis Of Nanoparticles ◽  
Novel Synthesis

A novel synthesis process of ZIF-94 (also known as SIM-1) is developed for particle size tuning, using either NaOH or NH4OH as a deprotonator.

A Convenient Method for Preparing Well-Dispersed Er2Zr2O7 Nanocrystals

2010 ◽  
Vol 123-125 ◽  
pp. 611-614 ◽  
Author(s):  
Yu Ping Tong ◽  
Rui Zhu Zhang ◽  
Shun Bo Zhao ◽  
Chang Yong Li
Keyword(s):  
Particle Size ◽  
Combustion Synthesis ◽  
Crystal Size ◽  
Lattice Distortion ◽  
Combustion Method ◽  
Treatment Temperature ◽  
Synthesis Process ◽  
Thermal Treatment Temperature ◽  
Average Size ◽  
Xrd And Tem

Well-dispersed fluorite Er2Zr2O7 nanocrystals have been successfully prepared by a convenient salt-assistant combustion method. The effects of calcinations temperature and salt category on the characteristics of the products were investigated by XRD and TEM. The thermal treatment temperature has an important effect on crystal size and lattice distortion of the nanocrystals. The experiment showed that the introduction of salt in the combustion synthesis process resulted in the formation of well-dispersed Er2Zr2O7 nanocrystals. The average size was 30 nm and was in agreement with the XRD result, which indicated that the nanocrystals were uniform in particle size distribution. Moreover, the possible formation process in the salt-assisted combustion synthesis was also analyzed.

Synthesis, Characterization, and Evaluation of Antimicrobial and Antioxidant Potential of Polyalthia longifolia Mediated Copper Nanoparticles

2021 ◽  
Vol 68 ◽  
pp. 35-51
Author(s):  
Sumaira Mumtaz ◽  
Raziya Nadeem ◽  
Raja Adil Sarfraz ◽  
Muhammad Shahid
Keyword(s):  
Copper Nanoparticles ◽  
Biological Activities ◽  
Low Cost ◽  
Copper Surface ◽  
Antioxidant Potential ◽  
Synthesis Process ◽  
Synthesis Of Nanoparticles ◽  
Characteristic Features ◽  
Antibacterial And Antifungal ◽  
Polyalthia Longifolia

Synthesis of nanoparticles of transition metals by using medicinal plants has been outstreched in recent years because of the characteristic features which are embodied in the end product. This work is proceded with the aim to synthesize and optimize copper nanoparticles (CuNPs-Pl) using aqueous extract of Polyalthia longifolia leaves (PlL) for characterization and evaluation of antimicrobial and antioxidant potential. The synthesis of CuNPs-Pl was confirmed by visual inspection of the dark brown residues in the reaction flask and via absorption band around 580nm by UV/Visible spectroscopy. Synthesis process was optimized through investigation of environmental variables. FTIR analysis was carried out for both PIL and CuNPs-Pl which identified the presence of alkanes, alcoholic, and aldehydic groups in the PlL and their encapsulation on the copper surface. The synthesized CuNPs-Pl were found to be spherical and rod shaped, and polydispersed when investigated through SEM study. Similarly, these nanoparticles had monoclinic structure and crystalline nature when analyzed by XRD. Moreover, these nanoparticles showed metallic form when EDX examination was done. Further, biological activities were performed. The synthesized nanoparticles showed considerable inhibition zones against Escherichia coli (12mm), Bacillus subtilis (11mm), Aspergillus niger (10mm), and Schyzophyllum commune (16mm) which depicted their powerful antibacterial and antifungal activity. Likewise, CuNPs-Pl were effeciently able to quench free radicals as indicated from the 2, 2-diphenyl-1-picrylhydrazyl (DPPH), hydrogen peroxide (H2O2), and nitric oxide (NO) assays by exhibiting 86.32, 50.45, and 48.23% inhibition respectively. Thus, the contemporary work has substantiated that low cost CuNPs-Pl can be highly proficient alternate or substitute of synthetic formulations.

scholarly journals Preparation of Ceria-Zirconia Mixed Oxide by Hydrothermal Synthesis

2015 ◽  
Vol 9 (7) ◽  
pp. 134 ◽  
Author(s):  
Siti Machmudah ◽  
M. Akmal Hadian ◽  
Lenno Samodro K. ◽  
Sugeng Winardi ◽  
Wahyudiono Wahyudiono ◽  
...  
Keyword(s):  
Solid Solution ◽  
Particle Size ◽  
Hydrothermal Synthesis ◽  
Mixed Oxides ◽  
Synthesis Process ◽  
Growth Morphology ◽  
Mixed Powder ◽  
Xrd Pattern ◽  
Tube Reactor ◽  
Internal Volume

Ceria-zirconia mixed oxides have been synthesized by hydrothermal synthesis process. Under hydrothermalconditions, water potential to control the direction of crystal growth, morphology, particle size and sizedistribution, because of the controllability of thermodynamics and transport properties by pressure andtemperature. The synthesis was carried out at temperatures of 150 − 200 oC and pressure of 5 MPa in a batchreactor. The reactor made of SUS 304 tube reactor with internal volume of 8.8 ml. The synthesized productswere calcined and characterized using SEM, XRD and FTIR. The results showed that the particles formed weresphere shaped particles with smooth morphology and the size of particle diameters were 35, 61, and 31 nm onaverage for reactions temperatures of 150, 180, and 200oC, respectively. The XRD pattern indicated thatceria-zirconia mixed powder was uniformly distributed in the structure to form a homogeneous solid solution.

Effect of the Synthesis Method on the Properties of Ultrafine YAG Powder

2018 ◽  
Vol 281 ◽  
pp. 40-45
Author(s):  
Jie Guang Song ◽  
Lin Chen ◽  
Cai Liang Pang ◽  
Jia Zhang ◽  
Xian Zhong Wang ◽  
...  
Keyword(s):  
Particle Size ◽  
Calcination Temperature ◽  
Hydrothermal Reaction ◽  
Synthesis Method ◽  
Particle Morphology ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Synthesis Process ◽  
Powder Materials ◽  
Co Precipitation

YAG materials has a number of unique properties, the application is very extensive. In this paper, the superfine YAG powder materials were prepared by co-precipitation method and hydrothermal precipitation method. The influence of synthesis process on the morphology of the powder was investigated. The results showed that the precursor powder prepared via the co-precipitation method is mainly from amorphous to crystalline transition with the increasing calcination temperature, the precursor agglomeration is more serious, In the process of increasing the calcination temperature, the dispersibility of the roasted powder is greatly improved, which is favorable for the growth of the crystal grains, so that the particle size of the powder is gradually increased, the YAG precursor prepared by the co-precipitation method is transformed into YAG crystals, the phase transition occurs mainly between 900 and 1100°C. When the molar ratio of salt to alkali is Y3+: OH-=1: 8 via the hydrothermal reaction, the YAG particles with homogeneous morphology can be obtained. When the molar ratio of salt and alkali is increased continuously, the morphology of YAG particles is not obviously changed. The co-precipitation method is easy to control the particle size, the hydrothermal method is easy to control the particle morphology.

Novel synthesis of a NiMoP phosphide catalyst via carbothermal reduction for dry reforming of methane

2021 ◽  
Author(s):  
Xinyu Chen ◽  
Wei Ding ◽  
Zhiwei Yao ◽  
Na Sun ◽  
Zhimeng Wang ◽  
...  
Keyword(s):  
Particle Size ◽  
Carbon Content ◽  
Carbothermal Reduction ◽  
Average Particle Size ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Average Particle ◽  
Novel Synthesis ◽  
Highly Dispersed

A Highly dispersed NiMoP phosphide catalyst with an average particle size of 9.1 nm and a carbon content of 53.5 wt% was firstly synthesized by carbothermal route using glucose as...

scholarly journals Biosynthetic potential assessment of four food pathogenic bacteria in hydrothermally silver nanoparticles fabrication

2019 ◽  
Vol 8 (1) ◽  
pp. 629-634 ◽  
Author(s):  
Amir Rahimirad ◽  
Afshin Javadi ◽  
Hamid Mirzaei ◽  
Navideh Anarjan ◽  
Hoda Jafarizadeh-Malmiri
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Zeta Potential ◽  
Pathogenic Bacteria ◽  
Heating Time ◽  
Synthesis Process ◽  
Ag Nps ◽  
Physico Chemical ◽  
Minimum Particle Size ◽  
Particle Size Analyzer

Abstract Silver nanoparticles (Ag NPs) were synthesized using four pathogenic bacterial extracts namely, Bacillus cereus, E. coli, Staphylococcus aureus and Salmonella entericasubsp.enterica. Synthesis process were hydrothermally accelerated using temperature, pressure and heating time of 121°C, 1.5 bar ad 15 min. Physico- chemical characteristics of the fabricated Ag NPs, including, particle size, polydispersity index (PDI), zeta potential, broad emission peak (λmax) and concentration were evaluated using UV-Vis spectrophotometer and dynamic light scattering (DLS) particle size analyzer. Furthermore, main existed functional groups in the provided bacterial extracts were recognized using Fourier transform infrared spectroscopy. The obtained results revealed that two main peaks were detected around 3453 and 1636.5 cm-1, for all bacterial extracts, were interrelated to the stretching vibrations of hydroxyl and amide groups which those had key roles in the reduction of ions and stabilizing of the formed Ag NPs. The results also indicated that, Ag NPs with much desirable characteristics, including minimum particle size (25.62 nm) and PDI (0.381), and maximum zeta potential (-29.5 mV) were synthesized using S. e. subsp. enterica extract. λmax, absorbance and concentration values for the fabricated Ag NPs with this bacterial extract were 400 nm, 0.202% a.u. and 5.87 ppm.

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