Influence of milling time on fineness of Centella Asiatica particle size produced using planetary ball mill

2012 ◽  
Author(s):  
M. Z. Borhan ◽  
R. Ahmad ◽  
M. Rusop ◽  
S. Abdullah
Keyword(s):  
Particle Size ◽  
Ball Mill ◽  
Milling Time ◽  
Centella Asiatica ◽  
Planetary Ball Mill

Microwave Sintering and Electric Properties of ZnO Varistor Ceramics

2013 ◽  
Vol 833 ◽  
pp. 75-79 ◽  
Author(s):  
Xin Xin He ◽  
Guo You Gan ◽  
Ji Kang Yan ◽  
Jing Hong Du ◽  
Jia Ming Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Ball Mill ◽  
Milling Time ◽  
Sintering Temperature ◽  
Microwave Sintering ◽  
Electric Properties ◽  
Planetary Ball Mill ◽  
Zno Varistor ◽  
C Doping ◽  
Zno Powder

The ZnO varistor ceramics were fabricated through microwave sintering at 800~1150°C using ZnO powder doped and undoped TiO2 prepared by planetary ball mill. And the effects of milling time, sintering temperature and doping on microwave sintering technique have been studied. The result shows that the powder is more homogeneously and with smaller particle size with the increasing of milling time, therefore the electric properties is improved. However the particle size and the electric properties tend towards stability after 20h milling time. The density and electric properties increase with the increasing of sintering temperature, but decrease sharply at 1100°C, so the best sintering temperature is 1100°C. Doping TiO2 improves the electric properties of ZnO, however the electric properties decrease with more than 2.5% doping.

Production of Herbal Nanopowders: Effect of Milling Time

2013 ◽  
Vol 686 ◽  
pp. 3-7
Author(s):  
M.Z. Borhan ◽  
A. Norhidayah ◽  
R. Ahmad ◽  
Mohamad Rusop ◽  
Saifollah Abdullah
Keyword(s):  
Particle Size ◽  
Ball Mill ◽  
High Performance ◽  
Milling Time ◽  
Centella Asiatica ◽  
Correlation Spectroscopy ◽  
Asiatic Acid ◽  
Top Down ◽  
Therapeutic Properties ◽  
Scanning Electron

Several clinical studies have proved the triterpenes in this herb have therapeutic properties and posses significant to health such as antitumor and wound healing. Centella asiatica nanopowders (CANPs) have been produced via top down approach using Planetary Ball Mill (PBM) at 0.5, 4 and 8 hours of milling in optimized condition. CANPs have been characterized using Photo Correlation Spectroscopy (PCS), Field Emission Scanning Electron Microscope (FESEM) and High Performance Liquid Chromatography (HPLC). As a result significant reduction on size was observed as increased a milling time by comparing their z-Average (nm) and the morphology of CANPs exist in the agglomerated form. The HPLC results showed significant increase in concentration of asiatic acid by comparing the concentration of asiatic acid in extract of CANPs and coarse powders whereby the asiaticoside completely disappeared after milling. Thus, nanoherbal can be said as improving the extraction ratio of asiatic acid compared to the coarse powders due to the smaller particle size and larger surface area and the disappearance of asiaticoside still not completely understood.

Effect of Milling Time on Particle Size and Surface Morphology of Commercial Zeolite by Planetary Ball Mill

2013 ◽  
Vol 795 ◽  
pp. 711-715 ◽  
Author(s):  
N.Z.F. Mukhtar ◽  
M.Z. Borhan ◽  
Mohamad Rusop ◽  
Saifollah Abdullah
Keyword(s):  
Particle Size ◽  
Ball Milling ◽  
Ball Mill ◽  
Milling Time ◽  
Size Range ◽  
Synthetic Zeolite ◽  
Inorganic Materials ◽  
Planetary Ball Mill ◽  
Dry Grinding ◽  
Particle Sizer

Ball milling is a top down approach and a method to reduce size of particle while Zeolite is a valuable inorganic materials having wide variety of applications. In this paper, ball milling of commercial synthetic Zeolite powder was studied with their time varied. Wet ball milling was selected as a potential means to decrease the particle size of Zeolite over dry grinding. The parameters that included in this study were rotational speed, balls to powder ratio, water to powder ratio and milling time. These nanozeolite were characterized via Zeta-sizer nanoseries of particle sizer, FESEM, and also FTIR. Results showed that commercial synthetic Zeolite powder with particle size larger than 45 μm may be reduced into the size range between 0.2 0.3 μm by planetary ball mill.

Evaluation of particle size reduction and agglomeration in dry grinding of natural quartz in a planetary ball mill

2020 ◽  
Vol 368 ◽  
pp. 149-159 ◽  
Author(s):  
Pedro L. Guzzo ◽  
Filipe B. Marinho de Barros ◽  
Bruno R. Soares ◽  
Juliano B. Santos
Keyword(s):  
Particle Size ◽  
Ball Mill ◽  
Size Reduction ◽  
Planetary Ball Mill ◽  
Natural Quartz ◽  
Particle Size Reduction ◽  
Dry Grinding

scholarly journals Synthesis of Nanocrystalline WC Single-Phase Refractory via Mechanical Milling

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Mansour Razavi ◽  
Mohammad Reza Rahimipour ◽  
Rahim Yazdani-Rad
Keyword(s):  
Mechanical Milling ◽  
Ball Mill ◽  
Single Phase ◽  
Milling Time ◽  
Raw Materials ◽  
Planetary Ball Mill ◽  
Crystalline Size ◽  
Nanometer Scale

In this paper the possibility of production of nanocrystalline WC single-phase by mechanical milling has been investigated. The raw materials containing tungsten and carbon with WC as nucleation were milled in a planetary ball mill and sampled in different times. Studies showed that after 75 hours of milling the WC with W2C was produced and remained constant in higher milling time. Adding WC to raw materials at the beginning process leads to the fact that after 50 hours of milling only WC was synthesized without undesirable W2C phase. This material remained stable until higher times of milling too. From broadening of XRD peaks, the crystalline size in synthesized WC was estimated in nanometer scale which lower than the system containing primary WC, and it means that the strain in this system was lower than first system.

Impact of Nanopowders on Exraction Yield of Centella asiatica

2013 ◽  
Vol 667 ◽  
pp. 246-250 ◽  
Author(s):  
M.Z. Borhan ◽  
R. Ahmad ◽  
Mohamad Rusop ◽  
Saifollah Abdullah
Keyword(s):  
Ball Mill ◽  
Centella Asiatica ◽  
Extraction Yield ◽  
Planetary Ball Mill ◽  
Asiatic Acid ◽  
Bioactive Constituents ◽  
Original Powder ◽  
The Mean ◽  
Particle Sizer

Centella asiatica (C. Asiatica) is a traditional herb that has been used in raditional medicine especially in Asia region. Recently the pharmalogical study of Asiatic acid (AA) which is one of bioactive constituents in C. Asiatica has been studied and revealed that this compound has a potential to be use in medicine area. The objective of this paper is to produce nanoparticles C. Asiatica by Planetary Ball Mill (PBM) and determined the effect of nanonization on extraction yield of asiatic acid. The particles were analyzed using particle sizer to determine size of particle produce and the morphology was evaluated through FESEM. As a result, the mean particles size of nanopowders was 501.10 nm and the extraction of asiatic acid using nanopowders showed 82.09 % higher than original powder.

scholarly journals Influence of liberation of sulphide minerals on flotation of sedimentary copper ore

2017 ◽  
Vol 18 ◽  
pp. 01025
Author(s):  
Alicja Bakalarz ◽  
Magdalena Duchnowska ◽  
Andrzej Luszczkiewicz
Keyword(s):  
Particle Size ◽  
Ball Mill ◽  
Milling Time ◽  
Mineral Processing ◽  
Copper Ore ◽  
Sulphide Minerals ◽  
Mineral Liberation ◽  
Mineral Production

Ore liberation is one of the most important parameter in mineral processing, especially in flotation. To separate the valuable components from gangue minerals, it is necessary to liberate one from others. It is achieve primarily through crushing and grinding. These stages are one of the most expensive of mineral production. It is important to determine the adequate mineral liberation which would result in huge savings in the overall cost of flotation plant. The aim of the paper was the analysis of the influence of milling time on the laboratory flotation of the copper ore from stratiform Polish deposit. Three different milling time of copper ore in laboratory ball mill was applied. The flotation results were presented as the recovery-recovery and grade-recovery upgrading curves. The liberation of sulphides and the particle size of sulphides in flotation product were analysed and compared.

The Effect of Milling Time on Physical Properties, Magnetic Properties and Microstructure of Bonded Magnet BaFe12O19

2020 ◽  
Vol 855 ◽  
pp. 34-39
Author(s):  
Suprapedi ◽  
Muljadi ◽  
Priyo Sardjono ◽  
Ramlan Ramlan
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Particle Size Distribution ◽  
Physical Properties ◽  
Bulk Density ◽  
Ball Mill ◽  
Milling Time ◽  
Mixed Powder ◽  
Bonded Magnet

A bonded permanent magnet of Barium hexa Ferrite has been made using powder BaFe12O19 (commercial ferrite) and a polymer of bakelite powder as binder. The composition of bakelite was varried 5% wt. The preparation of sample was begun with mass weighing for each material, then mixed together using ball mill for 1, 6 and 12 hours and using aquades as milling media. The mixed powder is dried in an oven at 110 °C for 4 hours, then the particle size distribution was measured. After that, the dried sample powder was pressed to form a pellet at pressure 40 MPa and temperature about 160 °C for 20 minutes. The characterization of sample pellet was done such as measurement of bulk density, hardness , magnetic properties using VSM and anylisis of microstructure using SEM. The results of the characterization show that the density and magnetic properties tend to increase with increasing of milling time, where the highest density, hardness and highest magnetic properties are achieved at sample with milling time for 12 hours. The value of magnetic properties at this condition are flux magnetic of 530 Gauss, remenance of 3100 Gauss, coercivity of 1,10 kOe.

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