Effects of Support, Particle Size, and Process Parameters on Co3O4Catalyzed H2O Oxidation Mediated by the [Ru(bpy)3]2+Persulfate System

ChemCatChem ◽  
2013 ◽  
Vol 5 (2) ◽  
pp. 550-556 ◽  
Author(s):  
Chieh-Chao Yang ◽  
Tamara M. Eggenhuisen ◽  
Mariska Wolters ◽  
Anil Agiral ◽  
Heinz Frei ◽  
...  
Keyword(s):  
Particle Size ◽  
Process Parameters ◽  
Support Particle

scholarly journals Application of Statistical Design to Assess the Critical Process Parameters of Ethanol Injection Method for the Preparation of Liposomes

2019 ◽  
Vol 18 (1) ◽  
pp. 103-111 ◽  
Author(s):  
Sayani Bhattacharyya ◽  
Bharani S Sogali
Keyword(s):  
Particle Size ◽  
Process Parameters ◽  
Particle Size Analysis ◽  
Polydispersity Index ◽  
Size Analysis ◽  
Ethanol Injection ◽  
Injection Method ◽  
Critical Process Parameters ◽  
Critical Process ◽  
Ethanol Injection Method

In the present study custom screening design was employed to observe the effect of four critical process parameters on particle size and polydispersity index of the liposomal formulation made by ethanol injection method. The four process parameters selected were lipid ratio, rate of injection, phase volume ratio and rotational speed of magnetic stirring. Eight different liposomal formulations were prepared using the design. The formulations were subjected to particle size analysis. The analysis was done at a significance level p<0.05 and found that the process parameters had significant effect on the particle size and polydispersity index of the formulations. The design was optimized for the individual responses with an overall desirability of more than 50%. Three batches of liposomes were formulated at optimized process parameters which matched the target as predicted by the design. Therefore, it can be concluded that the design was effective in production of nano sized stable monodisperse liposomes by ethanol injection method. Dhaka Univ. J. Pharm. Sci. 18(1): 103-111, 2019 (June)

Process Parameters Affecting Particle Size of Water Atomised Bronze Powder

1988 ◽  
Vol 31 (4) ◽  
pp. 277-280 ◽  
Author(s):  
J. Brito Correia ◽  
Nobumitsu Shohoji
Keyword(s):  
Particle Size ◽  
Process Parameters ◽  
Bronze Powder

Taguchi approach to erosion wear optimization of WC-10Co-4Cr sprayed austenitic steel subjected to equisized slurry

2018 ◽  
Vol 70 (9) ◽  
pp. 1774-1782 ◽  
Author(s):  
Gurmeet Singh ◽  
Satish Kumar ◽  
Satbir S. Sehgal
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Process Parameters ◽  
Rotational Speed ◽  
Solid Concentration ◽  
Erosion Wear ◽  
Pump Impeller ◽  
Content Type ◽  
Erosion Test

Purpose This paper aims to optimize the erosion wear analysis of slurry impeller material. Stainless steel (SS-410) was used as the pump impeller material. This erosion test was established to influence the rotational speed, solid concentration, time period and particle size. Fly ash was used as the erodent material. Design/methodology/approach The erosion wear experiments were performed at different particle size, rotational speed, time duration and solid concentration (by weight). These tests were performed at four different speeds of 750, 1,000, 1,250 and 1,500 rpm, and the time durations of these experiments are 75, 120,165 and 210 min. For protective coating, high-velocity oxygen-fuel spray process was used for depositing WC-10Co-4Cr coating on stainless steel. To investigate the influence of controlled process parameters on slurry erosion wear of pump impeller material, Taguchi method was used. Findings Results show that significant improvement in erosion wear resistance has been observed by using WC-10Co-4Cr coating. The process parameters affecting the erosion wear loss were in following order: time > rpm > concentration > particle size. The means of signal-to-noise ratio of stainless steel SS410 with and without coating vary from 93.56 to 54.02 and from 86.02 to 48.18, respectively. Originality/value For the erosion wear rate of both uncoated and coated stainless steel, the most powerful influencing factor was identified as time. The erosion test reveals that the coating exhibits ductile erosion mechanism and shows better erosion wear resistance (approximately two times) compared to uncoated stainless steel.

Synthesis of Nd2Fe14B powders by spray-drying and reduction–diffusion processes

2001 ◽  
Vol 16 (4) ◽  
pp. 1083-1089 ◽  
Author(s):  
X. L. Dong ◽  
B. K. Kim ◽  
C. J. Choi ◽  
K. S. Park ◽  
Z. D. Zhang
Keyword(s):  
Particle Size ◽  
Thermal Properties ◽  
Spray Drying ◽  
Process Parameters ◽  
Diffusion Processes ◽  
Liquid Solution ◽  
Metal Salts ◽  
Mechanochemical Method ◽  
Precursor Powders ◽  
Spray Dried

The magnetic Nd–Fe–B powders were prepared by a mechanochemical method, including the processes of spray drying, debinding, milling, H2 reduction, Ca reduction, and washing. The liquid solution dissolved with various metal salts was first spray-dried to prepare the precursor powders having uniformly dispersed Nd, Fe, and B components. The precursor powders in turn were subjected to the subsequent processes. The particle size of the resultant Nd–Fe–B powders was about 1 μm. Effects of the process parameters on phases, morphologies, microstructures, compositions, and thermal properties of the powders were investigated.

scholarly journals Effect of initial support particle size of MnOx/TiO2 catalysts in the selective catalytic reduction of NO with NH3

RSC Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 4682-4692 ◽  
Author(s):  
Yang Yang ◽  
Zhun Hu ◽  
Rongli Mi ◽  
Dan Li ◽  
Xiang Yong ◽  
...  
Keyword(s):  
Particle Size ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Support Particle ◽  
Initial Support

Support particle size could influence the surface Mn4+/Mn ratio of catalysts, promoting the reactivity of bridge nitrate, therefore enhancing SCR performance.

scholarly journals Implementing Feedback Granule Size Control in a Continuous Dry Granulation Line Using Controlled Impeller Speed of the Granulation Unit, Compaction Force and Gap Width

2020 ◽  
Author(s):  
Annika Wilms ◽  
Andreas Teske ◽  
Robin Meier ◽  
Raphael Wiedey ◽  
Peter Kleinebudde
Keyword(s):  
Particle Size ◽  
Process Parameters ◽  
Control Strategies ◽  
Granule Size ◽  
Oral Dosage ◽  
Impeller Speed ◽  
Median Particle Size ◽  
Dry Granulation ◽  
Median Particle ◽  
Roll Compaction

Abstract Purpose In continuous manufacturing of pharmaceuticals, dry granulation is of interest because of its large throughput capacity and energy efficiency. In order to manufacture solid oral dosage forms continuously, valid control strategies for critical quality attributes should be established. To this date, there are no published control strategies for granule size distribution in continuous dry granulation. Methods In-line laser diffraction was used to determine the size of granules in a continuous roll compaction/dry granulation line (QbCon® dry). Different process parameters were evaluated regarding their influences on granule size. The identified critical process parameters were then incorporated into control strategies. The uncontrolled and the controlled processes were compared based on the resulting granule size. In both processes, a process parameter was changed to induce a shift in median particle size and the controller had to counteract this shift. Results In principle, all process parameters that affect the median particle size could also be used to control the particle size in a dry granulation process. The sieve impeller speed was found to be well suited to control the median particle size as it reacts fast and can be controlled independently of the throughput or material. Conclusion The median particle size in continuous roll compaction can be controlled by adjusting process parameters depending on real-time granule size measurements. The method has to be validated and explored further to identify critical requirements to the material and environmental conditions.

Abrasive Assisted Electrochemical Machining of Al-B4C Nanocomposite

2015 ◽  
Vol 787 ◽  
pp. 523-527 ◽  
Author(s):  
K. Rajkumar ◽  
L. Poovazhgan ◽  
P. Saravanamuthukumar ◽  
S. Javed Syed Ibrahim ◽  
S. Santosh
Keyword(s):  
Particle Size ◽  
Boron Carbide ◽  
Process Parameters ◽  
Positive Impact ◽  
Removal Rate ◽  
Electrochemical Machining ◽  
Weight Ratio ◽  
High Strength ◽  
High Wear Resistance ◽  
Particle Size Reduction

Aluminium reinforced with SiC, Al2O3 and B4C etc. possesses an attractive combination of properties such as high wear resistance, high strength to weight ratio and high specific stiffness. Among the various reinforced materials used for aluminium, B4C has outperformed all others in terms of hardening effect. Particle size reduction of B4C is found to have positive impact on the material hardness. In the view of physical properties, B4C has less density than that of SiC and Al2O3, which makes it an attractive reinforcement for aluminium and its alloys for light weight applications. In this work, Al nano B4C composite prepared by ultrasonic cavitation method was machined by Abrasive assisted electrochemical machining using cylindrical copper tool electrodes with SiC abrasive medium. In this paper, attempts have been made to model and optimize process parameters in Abrasive assisted Electro-Chemical Machining of Aluminium-Boron carbide nano composite. Optimization of process parameters is based on the statistical techniques using Response Surface Methodology with four independent input parameters such as voltage, current, abrasive concentration and feed rate were used to assess the process performance in terms of material removal rate and surface finish. The obtained results were compared with abrasive assisted electro chemical machining of Aluminium-Boron carbide micro composite and the effect of particle size on the process parameters was analyzed.

Effects of SiC Particle Size and Process Parameters on the Microstructure and Hardness of AZ91/SiC Composite Layer Fabricated by FSP

2011 ◽  
Vol 20 (9) ◽  
pp. 1554-1562 ◽  
Author(s):  
P. Asadi ◽  
M. K. Besharati Givi ◽  
K. Abrinia ◽  
M. Taherishargh ◽  
R. Salekrostam
Keyword(s):  
Particle Size ◽  
Process Parameters ◽  
Composite Layer ◽  
Sic Particle
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