The Photocatalytic Degradation of Methomyl over TiO2 Nanopowder Prepared by the Low Temperature Solvothermal Route

2014 ◽  
Vol 804 ◽  
pp. 209-212 ◽  
Author(s):  
Pusit Pookmanee ◽  
Isara Phiwchai ◽  
Sorachon Yoriya ◽  
Ratchadaporn Puntharod ◽  
Supaporn Sangsrichan ◽  
...  
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Photocatalytic Degradation ◽  
High Performance ◽  
Average Particle Size ◽  
Ammonium Hydroxide ◽  
Average Particle ◽  
Mixed Solution ◽  
Liquid Chromatograph ◽  
Solvothermal Route

Titanium dioxide (TiO2) nanopowder was prepared by the low temperature solvothermal route with starting chemicals containing titanium isopropoxide, ammonium hydroxide, nitric acid and ethanol in a PTFE–lined autoclave. The final pH of the mixed solution was 1 and treated at 100 °C for 2–6 h. The white precipitated was filtered and dried in an oven at 80 °C for 24 h. The phase transition was characterized by X–ray diffractometer (XRD). Single phase anatase structure was obtained without calcination step. The morphology and particle size of TiO2nanopowder was investigated by scanning electron microscope (SEM). The average of TiO2nanopowder size was 80–120 nm. The average particle size increased with temperature and time increased. The photocatalytic degradation of methomyl in natural water was studied by high performance liquid chromatograph (HPLC). The percentage of methomyl was decreased in the presence of 34, 23 and 24 over TiO2nanopowder prepared by the low temperature solvothermal route at 100 °C for 2, 4 and 6 h, respectively.

Copper (II) Oxide Powder Prepared by Low Temperature Hydrothermal Method

2020 ◽  
Vol 861 ◽  
pp. 270-276
Author(s):  
Pusit Pookmanee ◽  
Maneerat Mueangjai ◽  
Sukon Phanichphant ◽  
Chanchana Thanachayanont
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Hydrothermal Method ◽  
Ph Value ◽  
Average Particle Size ◽  
Fine Powder ◽  
Chemical Compositions ◽  
Average Particle ◽  
Mixed Solution ◽  
X Ray

In this research, CuO powder was prepared by low temperature hydrothermal method. Copper (II) nitrate trihydrate (Cu (NO3)2.3H2O) and sodium hydroxide (NaOH) were used as the starting precursors. The final pH value of the mixed solution was adjusted to 9 by 4M NaOH and treated at 100 oC and 200 oC for 4 and 6 h. The black fine powder was obtained after dried at 80 oC for 4 h. The phase was characterized by X-ray diffraction (XRD). A single phase of monoclinic structure of CuO powder prepared by low temperature hydrothermal method at 200 oC for 4 and 6 h was obtained without calcination step. The morphology and particle size were investigated by scanning electron microscopy (SEM). The morphology was flower-like in shape and the average particle size in range of 0.3×0.7 μm. The element composition was indicated by energy dispersive X-ray spectrometry (EDX). The chemical compositions showed the characteristic X-ray energy of copper (Kα = 0.95 keV) and oxygen (Kα = 0.53 keV). The functional group was indentified by fourier transform spectrophotometry (FTIR). The wavenumber at 433-531 cm-1 was corresponded to vibration of Cu-O stretching.

Ammonia-etching-assisted nanotailoring of manganese silicate boosts faradaic capacity for high-performance hybrid supercapacitors

2020 ◽  
Vol 4 (5) ◽  
pp. 2220-2228 ◽  
Author(s):  
Xueying Dong ◽  
Yifu Zhang ◽  
Qiang Chen ◽  
Hanmei Jiang ◽  
Qiushi Wang ◽  
...  
Keyword(s):  
Particle Size ◽  
High Performance ◽  
Average Particle Size ◽  
Average Particle ◽  
Manganese Silicate ◽  
Hybrid Supercapacitors ◽  
20 Nm

Nanotailoring of active manganese silicate with an average particle size of about 20 nm is realized by an ammonia-etching-assisted route, delivering a 3.55-times higher faradaic capacity than the traditional yolk–shell counterpart in hybrid supercapacitors.

scholarly journals Effect of dopants [Gd3+, Sm3+, Ca2+, Sr2+ and Ba2+] on the performance characteristics of ceria based electrolytes for application in solid oxide fuel cells

2014 ◽  
Vol 10 (2) ◽  
Author(s):  
M.L. Reni ◽  
A. Samson Nesaraj
Keyword(s):  
Particle Size ◽  
Fuel Cells ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
Average Particle Size ◽  
Solid Oxide ◽  
Narrow Particle Size Distribution ◽  
Average Particle ◽  
Doped Ceria ◽  
Oxide Fuel

Doped CeO2 based materials are now-a-days proposed as alternate electrolyte materials for solid oxide fuel cells (SOFCs) working at low temperature (~723 – 873 K). In this research work, nanoparticles of CeO2 doped with Gd3+, Sm3+, Ca2+, Sr2+ and Ba2+were prepared by a simple homogeneous chemical precipitation method. The prepared materials (after heat treatment at 1023 K for 2 hours) were systematically characterized by XRD, EDAX analysis, FTIR , particle size analysis and SEM.  Lattice parameters were calculated from the XRD data. The XRD results indicate that all the doped ceria samples studied are single phase with a cubic fluorite structure. The average particle size of the doped ceria powder was about 48 – 115 nm and the particles have shown narrow particle size distribution patterns. AC impedance spectroscopy studies performed on the sintered specimens have shown better oxide ion conductivity values and hence these materials may be suitable for application as electrolyte materials in solid oxide fuel cells working at low temperature (~723 – 873 K). ________________________________________GRAPHICAL ABSTRACT

Mössbauer Investigation of γ-Fe2O3 Nanocrystals in Silica Matrix Prepared by the Sol-gel Method

2002 ◽  
Vol 57 (3-4) ◽  
pp. 154-158 ◽  
Author(s):  
C. Cannas ◽  
G. Concas ◽  
F. Congiu ◽  
A. Musinu ◽  
G. Piccaluga ◽  
...  
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Sol Gel ◽  
Average Particle Size ◽  
Volume Ratio ◽  
Silica Matrix ◽  
Blocking Temperature ◽  
Average Particle ◽  
Gel Method ◽  
Sol Gel Method

A series of Fe2O3-SiO2 nanocomposites (25 weight % of Fe2O3) has been prepared using a sol-gel method. Samples showing different features were obtained by varying the evaporation conditions acting on the surface / volume ratio of the starting sol. The samples were investigated using Mössbauer spectroscopy at low temperature. The Fe2O3 nanoparticles have been identified as maghemite ( γ-Fe2O3) particles. The samples show a superparamagnetic behavior with a blocking temperature that depends on the average particle size.

scholarly journals Preparation and Evaluation of Sunflower Oil Nanoemulsion As a Sunscreen

2019 ◽  
Vol 7 (22) ◽  
pp. 3757-3761
Author(s):  
Anayanti Arianto ◽  
Cindy Cindy
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Low Temperature ◽  
Sunflower Oil ◽  
Room Temperature ◽  
Ph Value ◽  
Average Particle Size ◽  
Tween 80 ◽  
Average Particle ◽  
Spontaneous Emulsification

BACKGROUND: There are a lot of different types of sunscreen products (oils, sticks, gels, creams, lotions) which can be found on the world's market. Sunscreen product that contains active chemical ingredients sometimes has harmful effects on the skin. Sunflower oil contains vitamin E and acts as a natural sunscreen which can absorb UVB light. The average droplet size of nanoemulsion is between 100 and 500 nm and do not show the problems of stability (creaming, flocculation, coalescence, and sedimentation), which are commonly associated with macroemulsions. AIM: The aim of this study was to prepare and evaluate the sunflower oil nanoemulsion as a sunscreen. METHODS: Sunflower oil nanoemulsions were prepared by spontaneous emulsification method with 3 formulas F1 (Tween 80 38%, sorbitol 22%), F2 (Tween 80 36%, sorbitol 24%), F3 (Tween 80 34%, sorbitol 26%) and 5% sunflower oil as a sunscreen substance. The nanoemulsions were evaluated for particle size, physical stability in room temperature (25 ± 2°C), low temperature (4 ± 2°C) and high temperature (40 ± 2°C) during experiment for 12 weeks of storage, centrifugation at 3750 rpm for 5 hours, viscosity, pH, freeze-thaw test and sun protection value (SPF) value by in vitro. RESULTS: The results of nanoemulsion evaluation showed that nanoemulsion formula F1 had the smallest average particle size of 124.47 nm with yellowish colour, clear, transparent, pH value (6.5 ± 0.1), viscosity value (225 ± 25 cP), did not show any separation or creaming in the centrifugation, and stable during experiment for 12 weeks of storage at room temperature, low temperature and high temperature. The SPF value of all nanoemulsion preparations was higher than that of the emulsion. CONCLUSION: The preparation of the sunflower oil nanoemulsion with a ratio of Tween 80 and sorbitol (38: 22) produces a stable nanoemulsion during the experiment for 12 weeks storage at the room, low and high temperature. The nanoemulsion preparation has higher SPF values compared to the emulsion. This nanoemulsion formulation could be considered more effective in sunscreen cosmetic use compare to the emulsion.

scholarly journals Tunable heat generation in nickel-substituted zinc ferrite nanoparticles for effective magnetic hyperthermia

2021 ◽  
Author(s):  
Ralandinliu Kahmei ◽  
Papori Seal ◽  
Jyoti Prasad Borah
Keyword(s):  
Particle Size ◽  
Applied Field ◽  
High Performance ◽  
Cetyltrimethylammonium Bromide ◽  
Zinc Ferrite ◽  
Magnetic Nanoparticle ◽  
Average Particle Size ◽  
Magnetic Hyperthermia ◽  
Ferrite Nanoparticles ◽  
Average Particle

We report a high performance magnetic nanoparticle as hyperthermic agent under low applied field and frequency. CTAB (cetyltrimethylammonium bromide)-coated NixZn1-xFe2O4 nanoparticles of average particle size < 25 nm with various...

Ultrahigh yield synthesis of mesoporous carbon nanoparticles as a superior lubricant additive for polyethylene glycol

2020 ◽  
Vol 49 (16) ◽  
pp. 5283-5290 ◽  
Author(s):  
Zihao Mou ◽  
Baogang Wang ◽  
Zhiyu Huang ◽  
Hongsheng Lu
Keyword(s):  
Particle Size ◽  
Polyethylene Glycol ◽  
Pore Size ◽  
Carbon Nanoparticles ◽  
Mesoporous Carbon ◽  
High Performance ◽  
Average Particle Size ◽  
Lubricant Additive ◽  
Average Particle

Mesoporous carbon nanoparticles (MCNPs) with an average particle size of 27.3 nm and a pore size of 3–5 nm were facilely synthesized in ultrahigh yield (91.7 wt%) and used as a high-performance lubricant additive for polyethylene glycol (PEG200).

Microwave Synthesis of Nano-Titanium Carbide

2011 ◽  
Vol 399-401 ◽  
pp. 561-564 ◽  
Author(s):  
Ping An Liu ◽  
Qing Song Yang ◽  
An Ze Shui ◽  
Hui Wang ◽  
Xiao Su Cheng ◽  
...  
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Carbon Black ◽  
Titanium Carbide ◽  
Microwave Synthesis ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Synthesis Temperature ◽  
Synthesis Rate ◽  
Average Particle

A new synthesis technology of titanium carbide with microwave is introduced in this article. Microwave synthesis technology is a fast and relatively low temperature of synthesis method. Nano-titanium carbide powders were synthesized by carbothermal reduction of titanium dioxide and carbon black with the microwave synthesis method at 1100°C-1400°C in argon gas atmosphere. Nano-TiO2powder and carbon black were used as raw materials. The TiC powders were characterized with the XRD and TEM. The experimental results show that the synthesis rate is quick, even at relatively low synthesis temperature. The average particle size of the TiC powders synthesized by the microwave synthesis technology under low temperature (<1300°C) is less than 50nm, and the average particle size augments with increasing the microwave synthesis temperature and time.

Synthesis and Characterization of Monodisperse Nanocrystalline HZSM-5 Zeolite

2013 ◽  
Vol 423-426 ◽  
pp. 135-138
Author(s):  
Jun Fang Wei ◽  
Fang Zhu ◽  
Xiao Yan Zhang
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Ammonium Hydroxide ◽  
Crystallization Time ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
Influence Of Crystallization

A monodisperse nanocrystalline HZSM-5 zeolite was prepared by varying-temperature synthesis method with aluminum nitrate (Al (NO3)3), tetraethyl orthosilicate (TEOS), and tetrapropyl ammonium hydroxide (TPAOH) as raw materials. X-ray diffraction (XRD) characterization results showed that the crystallinity of HZSM-5 prepared by varying-temperature synthesis method was higher than constant-temperature synthesis . The influence of crystallization temperature and time on morphology and particle size of HZSM-5 is represented by scanning electronic microscopy (SEM) characterization: nanocrystalline HZSM-5 with more regular morphology and smaller particle size can be prepared by varying-temperature synthesis method. The minimum average particle size is 0.3μm. The particle size will grow up to 3.0μm with the crystallization time prolonged.

Chemical Synthesis and Characterization of Bismuth Vanadate Powder

2010 ◽  
Vol 93-94 ◽  
pp. 153-156 ◽  
Author(s):  
Pusit Pookmanee ◽  
Sumintra Paosorn ◽  
Sukon Phanichphant
Keyword(s):  
Particle Size ◽  
Single Phase ◽  
Average Particle Size ◽  
Ammonium Hydroxide ◽  
Bismuth Vanadate ◽  
Precipitation Method ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Co Precipitation

Bismuth vanadate powder was synthesized by a chemical co-precipitation method. Bismuth nitrate and ammonium vanadate were used as the starting precursors. The yellow precipitated powder was formed after adding ammonium hydroxide until the pH of final solution was 7. The powder was filtered and dried at 60 °C for 24h and calcined at 200-400 °C for 2h. The phase of bismuth vanadate powder was studied by X-ray diffraction (XRD). A single phase of monoclinic structure was obtained after calcinations at 200-400 °C for 2h. The morphology and particle size of bismuth vanadate powder were investigated by scanning electron microscopy (SEM). The particle was irregular in shape and highly agglomerated with an average particle size of 0.5 µm in width and 1.5 µm in length.

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