The present study focuses on the investigation of the premilling treatment to the microstructure, phase composition, and solubility in Cu (wt%) alloy processed by a highenergy ball ...
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Hence size reduction technique by a topdown approach using wet milling process was utilized to improve the solubility and, consequently, the dissolution velocity of aceclofenac. The quality of the final product was ensured by Quality by Design approach wherein the effects of critical material attributes and critical process parameters were ...
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These studies are particularly important as for the first time the mechanochemical perspective, milling parameters such as milling material, ball size, the energy impact, was put on polymerization reactions. 91,99,181 Recently, Lamaty and Giani expanded the scope to the ROP of morpholine2,5dione using ball milling. 182
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The effect of milling time and speed on solid solubility of V in Al and grain refinement was studied. Highenergy ball milling was used to produce AlxV (x = 2, 5, and 10 at.%) alloys at milling speeds of 280 and 350 RPM. The ballmilling time was varied from 10 to 100 hours. The ballmilled alloys were consolidated
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The molecular miscibility between NFX and 17 coformer candidates was firstly predicted using Hansen solubility parameters (HSPs) and six NFX CAs were successfully prepared by dry ball mill. Compared with crystalline NFX, four NFX CAs showed enhanced solubility (up to ) and dissolution rates.
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In this work, a blend of Ti, Nb, and Mn powders, with a nominal composition of 15 wt.% of Mn, and balanced Ti and Nb wt.%, was selected to be mechanically alloyed by the following two alternative highenergy milling devices: a vibratory 8000D mixer/mill® and a PM400 Retsch® planetary ball mill. Two balltopowder ratio (BPR) conditions (10:1 and 20:1) were applied, to study the evolution of ...
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The effects of processing parameters in ball milling and the different behaviors of CuNb and CuMo alloys during milling were investigated. High powder yields can be obtained by changing the BPR value and ball size distribution and no clear dependence of BPR value on powder yield can be found from the experiment results. The addition of oxygen can largely reduce the effect of excessive cold ...
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In our previous study, the maximum of phosphorus solubility in citric acid of Huangmailing phosphorite was % after milling for 21 min by a planetary ball mill . Petkova et al. (2015) used a an exponential equation to describe the relationships between the phosphorus solubility, which reached the maximum (60%) at 300 min and milling time [ 7 ].
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The effects of mechanical alloying parameters (, milling time, milling speed, balltopowder mass ratio and Zn content) and their interactions were investigated involving 4 numerical factors ...
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Comprehensive insight into protein solubility and thermal stability improvements. ... pH, ionic strength, and additives) parameters (Kramer et al., 2012). Denaturation is considered as one of the main phenomena influencing the protein solubility. Based on the available ... Multidimensional swing highenergy nanoballmilling: Whey protein ...
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In the case of ball mills, the degree of mechanochemical transformation, α, is a function of the rotational frequencies ω k, the number of milling balls N, the ratio (R/l m) of the ball size R to the diameter of the jar l m, the material properties of milling ball and compounds to be treated X, and the time τ of mechanical treatment ...
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Recently, a few conjugated polymers have been synthesized by solventfree mechanochemical grinding in a ball mill (Citation 1824). These mechanochemical polymerizations have proved to be facile, consuming less energy, reducing waste produced and circumventing possible solubility issues from incompatible monomers.
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The shape, size and the surface area to volume ratio of the particles are parameters that affect critical properties of the material, such as its solubility. Drs Krok and Lenihan investigated the fragmentation of bonded particles into DEM granules of different shape and size during the ball milling process and have reported their findings in a ...
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Ball milling is a mechanical technique that is broadly used to grind powders into fine particles [134141]. The reactants are generally broken apart using solvent molecules in the traditional method; but in ball milling, reactants are broken by using mechanical forces. The term mechanochemistry has been introduced very recently [142].
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The maximum power draw in ball mill is when ball bed is 3540 % by volume in whole empty mill volume. Considering that ball bed has a porosity of 40 %, the actual ball volume is considered to be ...
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Conclusion. Ball milling is a powerful method to synthesize new alloys and to obtain nanostructured materials. The literature on this technique is abundant and diversified. This technique is relatively easy to use in a laboratory scale but the range of milling parameters is huge (milling time, milling intensity, powder/balls ratio, size of ...
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A total of 10 g of blend compositions with 5 wt.% Cr were subjected to highenergy ball milling for 12 h in stainlesssteel grinding media by a Spex8000 mill. The ball to powder weight ratio was set as 20:1, and the diameter of the milling ball was in the range of 58 mm.
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The values for these critical parameters may vary considerably. Typically, the amount of drug in the milling chamber is rather low, from 2 to 30%(wt), 9, 17, 18, 2529 while the number/volume of the milling pearls/beads is rather high, 1050% of the weight/volume of the slurry. The size of the nanomilling pearls is constant, between and mm. 9, 17, 2527, 29, 30 The milling times and ...
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The effects of processing parameters in ball milling and the different behaviors of CuNb and CuMo alloys during milling were investigated. High powder yields can be obtained by changing the BPR value and ball size distribution and no clear dependence of BPR value on powder yield can be found from the experiment results. The addition of oxygen can largely reduce the effect of excessive cold ...
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in the same year, a summary of amorphization of APIs by milling. Furthermore, in 2015 an overview of different milling techniques for improving the solubility of poorly watersoluble drugs was published [17]; this last article covered different types of milling, but focused its analysis on particle size reduction.
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Chemical gradient associated with the solubility of the W and γ(Ni, Co) phase is important in dominating the early stage of sintering. In case of the secondary ball milling, tungsten grains have a low mutual solubility in the binder phase and thus there is little sintering due to chemical gradients prior to liquid formation.
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Large value of α may lead to high dimensional stability of material, hence the α can be used to determine the ball milling ball milling process of 250−300 rpm ball milling speeds and 5−7 h ball milling times are recommended based on α, which causes a 95100 % increase in σ yc and a 3035 % decrease in CTE compared ...
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powder during ball milling. The milling parameters are listed in Table 1. After every 2 h of ball milling, the process was interrupted for 1 h to avoid a significant ... the solubility limit of Zn in the Mg phase is wt% at 340 °C and wt% at 100 °C, respectively. However, the solubility is very low
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For dry ball milling tests, swollen cable (5, 10, and 20 cm) samples were prepared by 80min swelling with shaking, fed into the ball mill reactor containing 20mmdiameter balls, and ...
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The aim of this study was to enhance the kinetic solubility and dissolution rate of ibuprofen by comilling with different excipients and to establish the underlying mechanism(s) for such enhancement. In the firstpart, two excipients (HPMC and soluplus) were selected from seven, and the optimal ballmilling parameters of speed and time (18 Hz, 15 min) were determined based on solubility ...
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Several operational parameters could affect the ballmilling process, such as milling speed, milling time, ball to powder ratio, ... Water holding capacity (WHC) and water solubility index (WSI) of the powders were determined using the method described by Phat et al. (2015). Onion peel powder samples of g (H) were added to 10 mL of ...
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This work aims at increasing solubility and dissolution rate of ziprasidone free base—Biopharmaceutics Classifaction System (BCS) class II compound. The authors describe a practical approach to amorphization and highlight problems that may occur during the development of formulations containing amorphous ziprasidone, which was obtained by grinding in highenergy planetary ball mills or ...
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Enhanced solid solubility, room temperature processing, and homogenous alloy formation are the key benefits provided by MA. Spark plasma sintering has largely been used to obtain highdensity HEA pellets from milled powders. ... The effect of various milling parameters, like type of milling, balltopowder ratio, milling speed, and milling time ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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