scholarly journals Decreasing Particle Size of Paclitaxel Using Polymer in Fractional Precipitation Process

2016 ◽  
Vol 54 (2) ◽  
pp. 278-283 ◽  
Author(s):  
Min Jae Kim ◽  
Jin-Hyun Kim
Keyword(s):  
Particle Size ◽  
Precipitation Process ◽  
Fractional Precipitation

Recovery of Fe and Al from red mud by a novel fractional precipitation process

2020 ◽  
Vol 27 (13) ◽  
pp. 14642-14653
Author(s):  
Fengqin Yu ◽  
Lin Huangfu ◽  
Chao Wang ◽  
Changming Li ◽  
Jian Yu ◽  
...  
Keyword(s):  
Red Mud ◽  
Precipitation Process ◽  
Fractional Precipitation

scholarly journals Empirical Modelling of Hydrodynamic Effects on Starch Nanoparticles Precipitation in a Spinning Disc Reactor

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2202 ◽  
Author(s):  
Sahr Sana ◽  
Vladimir Zivkovic ◽  
Kamelia Boodhoo
Keyword(s):  
Particle Size ◽  
Reynolds Number ◽  
Rotational Speed ◽  
Precipitation Process ◽  
Empirical Modelling ◽  
Operating Variables ◽  
Antisolvent Precipitation ◽  
Passive Mixing ◽  
The Difference ◽  
Spinning Disc

Empirical correlations have been developed to relate experimentally determined starch nanoparticle size obtained in a solvent–antisolvent precipitation process with key hydrodynamic parameters of a spinning disc reactor (SDR). Three different combinations of dimensionless groups including a conventional Reynolds number (Re), rotational Reynolds number (Reω) and Rossby number (Ro) have been applied in individual models for two disc surfaces (smooth and grooved) to represent operating variables affecting film flow such as liquid flowrate and disc rotational speed, whilst initial supersaturation (S) has been included to represent varying antisolvent concentrations. Model 1 featuring a combination of Re, Reω and S shows good agreement with the experimental data for both the grooved and smooth discs. For the grooved disc, Re has a greater impact on particle size, whereas Reω is more influential on the smooth disc surface, the difference likely being due to the passive mixing induced by the grooves irrespective of the magnitude of the disc speed. Supersaturation has little impact on particle size within the limited initial supersaturation range studied. Model 2 which characterises both flow rate and disc rotational speed through Ro alone and combined with Re was less accurate in predicting particle size due to several inherent limitations.

Preparation of Nanosized Barium Titanate Powder by a Direct Reactive Precipitation Method

2013 ◽  
Vol 690-693 ◽  
pp. 454-457
Author(s):  
Hong Bo Li ◽  
Shu Yan Wu ◽  
Jing Wang ◽  
Chun Jie Li
Keyword(s):  
Particle Size ◽  
Reaction Temperature ◽  
Surface Active Agent ◽  
Average Particle Size ◽  
Active Agent ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Average Particle ◽  
Powder Particle Size ◽  
Powder Morphology

Columnar crystaldendriteequiaxial dendritescolumnar crystalNanosized powder was synthesized by direct-reactive precipitation process using a stoichiometrical mixture of TiCl4, BaCl2 as the reactants while NaOH as precipitant. Under the ratio of Ba to Ti is 1.02, PH=13, three reaction temperature of 70°C, 80°C and 90°C were conducted respectively. Morphology and phase structure of powder were investigated, and the influence of reaction temperature on powder morphology was discussed. The result indicates that synthesized powder is single cubic BaTiO3 and contains no impurities. BaTiO3 powders generally show spherical, and average particle size decreases with increasing reaction temperature. When reaction temperature is 80°C, BaTiO3 powder has best uniformity and dispersivity with the diameter of 80-100nm. The influence of reaction temperature on powder particle size can be attributed to the corporate contribution of nucleation and growth rate. Polyglycol as surface active agent has a significant effect in restraining agglomeration.

Particle Size Analysis of the Synthesised ZrO2 from Natural Zircon Sand with Variation of pH Deposition Using Alkali Fusion-Coprecipitation Method

2019 ◽  
Vol 966 ◽  
pp. 89-94 ◽  
Author(s):  
Cahyaning Fajar Kresna Murti ◽  
Herman Aldila ◽  
Endarko ◽  
Triwikantoro
Keyword(s):  
Particle Size ◽  
Crystal Size ◽  
Precipitation Method ◽  
Size Analysis ◽  
Precipitation Process ◽  
Powder Particle Size ◽  
Alkali Fusion ◽  
Natural Zircon ◽  
Zircon Sand ◽  
Co Precipitation

Zirconia (ZrO2) is one of the refractory ceramic materials that have applications in several fields. The aim of this study was to synthesis ZrO2 from natural zircon sand collected from Kereng Pangi, Central Kalimantan with a variation of pH deposition using alkali fusion co-precipitation method. The synthesized ZrO2 began with the preparation process involved magnetic separation, milling, and leaching with HCl. Furthermore, the alkali fusion process was used KOH solution and heated in an electrical furnace at 700°C for 3 h whereas the co-precipitation process was carried out using a filtrate mixed with the NH4OH solution to reach a pH variation between 3–11 and then precipitated for 12 h. The precipitates were dried in an oven and then calcined at 800°C for 3 h. The structure of synthesized ZrO2 was characterized using XRD and the particle sizes were measured using particle size analyzer (PSA). The XRD analysis showed that the identified phase of zirconia powder is tetragonal with a crystal size in nanometer size. Result of PSA measurement revealed that the crystal size decreased in the range pH of 3 - 7, but increased in the range pH of 7 - 11. The biggest powder particle size could be achieved at 260 nm with pH 7 whereas the smallest size was at 143 nm occurred at pH 3.

scholarly journals Lignin Nanoparticles as A Promising Way for Enhancing Lignin Flame Retardant Effect in Polylactide

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2132 ◽  
Author(s):  
Benjamin Chollet ◽  
José-Marie Lopez-Cuesta ◽  
Fouad Laoutid ◽  
Laurent Ferry
Keyword(s):  
Particle Size ◽  
Flame Retardant ◽  
Inductively Coupled Plasma ◽  
Cone Calorimeter ◽  
Kraft Lignin ◽  
Melt Processing ◽  
Precipitation Process ◽  
Inductively Coupled ◽  
Negative Effect ◽  
Stable Cone

The present study investigates the effect of using lignin at nanoscale as new flame-retardant additive for polylactide (PLA). Lignin nanoparticles (LNP) were prepared from Kraft lignin microparticles (LMP) through a dissolution-precipitation process. Both micro and nano lignins were functionalized using diethyl chlorophosphate (LMP-diEtP and LNP-diEtP, respectively) and diethyl (2-(triethoxysilyl)ethyl) phosphonate (LMP-SiP and LNP-SiP, respectively) to enhance their flame-retardant effect in PLA. From the use of inductively coupled plasma (ICP) spectrometry, it can be considered that a large amount of phosphorus has been grafted onto the nanoparticles. It has been previously shown that blending lignin with PLA induces degradation of the polymer matrix. However, phosphorylated lignin nanoparticles seem to limit PLA degradation during melt processing and the nanocomposites were shown to be relatively thermally stable. Cone calorimeter tests revealed that the incorporation of untreated lignin, whatever its particle size, induced an increase in pHRR. Using phosphorylated lignin nanoparticles, especially those treated with diethyl (2-(triethoxysilyl)ethyl) phosphonate allows this negative effect to be overcome. Moreover, the pHRR is significantly reduced, even when only 5 wt% LNP-SiP is used.

Effect of SnO2 Particle Size on Properties of Ag-SnO2 Electrical Contact Materials Prepared by the Reductive Precipitation Method

2014 ◽  
Vol 936 ◽  
pp. 459-463 ◽  
Author(s):  
Zhi Jie Lin ◽  
Xu Dong Sun ◽  
Shao Hong Liu ◽  
Jia Lin Chen ◽  
Ming Xie ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Particle Size ◽  
Citric Acid ◽  
Electrical Contact ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Composite Powders ◽  
Contact Materials ◽  
Electrical Contact Materials ◽  
Ag Particle

Performances of Ag-SnO2 electrical contact materials can be strongly affected by the microstructure. In this work, Ag-SnO2 composite powders were synthesized by chemical reductive precipitation method. During the precipitation process, Ag particle was deposited onto the surface of SnO2 particle with the assistance of citric acid. The microstructure and properties were analyzed for the prepared Ag-SnO2 electrical contact materials. Our research reveals that the particle size of SnO2 has significant influence on the morphology of the Ag-SnO2 composite powders, and therefore on the microstructure and physical properties of the electrical contact materials. With the decrease of particle size of SnO2, hardness of the Ag-SnO2 electrical contact materials increases, while electrical conductivity decreases.

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