WEBAmorphization of ZIF8 and another isostructural MOF, ZIFmnIm (Zn(mnIm) 2 where mnIm = 4methyl5nitroimidazolate), during ball milling 85 also significantly enhances their iodine retention abilities, particularly in the case of ZIFmnIm.
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WEBAlmost half of the oral administered commercial drugs have low solubility, which affects their bioavailability [1,2].Several alternatives to modify the supramolecular structure of APIs have been proposed to overcome their low solubility; these strategies include amorphization [3,4,5], solid dispersion [6,7,8,9], preparation of cocrystals [10,11], and polymorphs .
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WEBXray diffraction has been used to investigate the kinetics of amorphization through ballmilling at 20 Hz, for five zeolitic imidazolate frameworks (ZIFs) and shows thatAmorphous ZIFzni is structurally indistinguishable from amorphous CdIF1 with both structures retaining the same shortrange order that is present in their crystalline precursors.
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WEBNov 5, 2022 · Fig. 3 shows a typical TGDTA curve of the silica powder modified by ml of HTMS after ball milling for 24 h. The DTA curve showed two peaks at approximately 130 and 300 °C. The first endothermic peak corresponds to the loss of physically adsorbed and/or hydrogenbonded water from the silica powder [22].The second exothermic peak .
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WEBSemantic Scholar extracted view of "Amorphization of βtricalcium phosphate particles by mechanochemical treatment" by Shiori Nawa et al. ... A leadbased relaxor material for multilayer ceramic capacitors was ground by ballmilling with partially stabilized zirconia balls of 1, 3 and 15mm in diameter and the effects of ball size and ...
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WEBAn intermetallic compound c –NiZr and a mixture of elemental powders of nickel and zirconium [Ni 50 Zr 50 (at. %)] have been mechanically ground (MG) and mechanically alloyed (MA), respectively, using a highenergy ball mill in various atmospheres. The products were characterized by xray diffraction, transmission electron microscopy, .
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WEBJul 25, 2011 · Three expanded graphites, EG1, EG2 and EG3 that were prepared by rapid heating expandable graphite to 600, 800 and 1000 °C, respectively, were ballmilled in a highenergy mill (planetarytype) in an air atmosphere with % iron powder Xray diffraction patterns of the products show that the amorphization process of the .
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WEBJan 1, 2001 · Phenomenology of Amorphization by MM Amorphization by MM consists of energizing the crystalline solid by the severe cyclic deformation that ballmilling provides. It is significant that ballmilling has been found to induce extensive plastic deformation even into extremely brittle materials such as A 15 intermetallic compounds like 'hn^Sn (6).
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WEBJan 31, 2011 · The microstructure of NiZr 2 in the course of amorphization by ballmilling is studied by transmission electron microscopy (TEM) and xray diffraction (XRD). The evolution from the initial fully crystalline alloy to a fully amorphized material is described. It is shown that prior to amorphization, the powder aggregates achieve a .
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WEBJun 15, 2004 · The overall amorphization in commercial arsenic sulfide prepared by direct synthesis from elemental constituents under highenergy ball milling occurs from two sources, these being hightolowTg ...
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WEBDec 1, 2004 · The ball milling was performed in a high energy planetary mill (Pulverisette 7—Fritsch) at room temperature (RT) and under a dry nitrogen atmosphere. We used ZrO 2 milling jars of 43 cm 3 with seven balls (Ø=15 mm) of the same material. One gram of material was placed in the planetary mill corresponding to a ball/sample weight ratio of .
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WEBSemantic Scholar extracted view of "Amorphization of single composition powders by mechanical milling" by C. Koch
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WEBAmorphization of metallic titanium by ball milling was presented. With the introduction of continuous pickup of impurities, hexagonally closepacked (hcp) titanium transformed gradually into an amorphous phase without experiencing any intermediate stage of forming a detectable metastable compound phase. The crystallization temperature of the .
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WEBJul 1, 1990 · Amorphization by ball milling. A review. Article. Oct 1988; PHYSICA B; Weeber; H. Bakker; A new method for the preparation of amorphous alloys is the mechanical alloying process. So far ...
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WEBApr 13, 2023 · Amorphization via high energy ball milling is a solid state processing technique in which continuously moving balls transfer kinetic/impact energy to the powder particles. It leads to welding ...
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WEBDOI: /S(99)000671 Corpus ID: ; HRTEM and EELS studies of defects structure and amorphouslike graphite induced by ballmilling article{Huang1999HRTEMAE, title={HRTEM and EELS studies of defects structure and amorphouslike graphite induced by ballmilling}, author={Jian Yu Huang}, .
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WEBJun 7, 2018 · This review summarizes the recent research in preparing pharmaceutical formulations (coamorphous, cocrystals, and polymorphs) through ball milling to enhance the physicochemical properties of ...
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WEBMay 27, 2013 · It is discovered that this guest retention is greatly enhanced upon facile amorphisation by ball milling, particularly in the case of ZIFmnIm, for which I2 loss is retarded by as much as 200 °C. The I2sorption and retention properties of several existing zeolitic imidazolate frameworks (ZIF4, 8, 69) and a novel framework, ZIFmnIm .
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WEBJun 1, 2022 · In this review, our focus is on amorphization induced by mechanical deformation which can be imparted by a variety of means, prominent among which are tribological processes, severe plastic deformation, nanoindentation, shock compression, diamond anvil cell and ball milling/mechanical alloying. The deformation introduces .
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WEBWe report on the crystal to amorphous phase transition induced by ball — milling in pure Si and pure Ge powders. Based on Xray diffraction patterns, scanning and transmission electron micrographs, EDX microanalyses, differential thermal analyses and differential scanning calorimetry, it seems that amorphization occurs during the continuous .
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WEBThe amorphization kinetics are revealed by Xray diffractometry (XRD), highresolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS). HRTEM investigations indie that, in the early stage of milling, the thick sp 2 layers are sliced into many thinner sheets because of cleavage along the basal planes. In ...
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WEBAug 23, 2021 · Amorphization technology has been the subject of continuous attention in the pharmaceutical industry, as a means to enhance the solubility of poorly watersoluble drugs. Being in a high energy state, amorphous formulations generally display significantly increased apparent solubility as compared to their crystalline counterparts, which may .
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WEBJul 1, 1993 · Massobrio C, Pontikis V V, Martin G. Phys Rev B Condens Matter, (15): 1990. MED: . The preparation of amorphous NiZr alloys by different ballmilling techniques. Weeber. Physica B+C, (3) 1987. Computer simulation studies of radiation induced amorphization. LIMOGE.
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WEBSep 15, 2019 · Solidstate amorphization during mechanical alloying of FexTi alloys (x = and 50 at.%) and the subsequent mechanicallyinduced crystallization by continued ball milling was studied. In the case of Fe 50Ti, it was revealed that by milling of Fe and Ti powders, firstly the nanocrystalline FeTi intermetallic compound forms, and then, the .
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WEBMay 27, 2020 · In this study, the putative correlation between the molecular mobility of a polymer and the ball milling drug amorphization kinetics (, time to reach full drug amorphization, t a) was studied using different grades of dextran (Dex) and polyvinylpyrrolidone (PVP) and the two model drugs indomethacin (IND) and .
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WEBAmorphization via high energy ball milling is a solid state processing technique in which continuously moving balls transfer kinetic/impact energy to the powder particles. It leads to welding, fracturing, fragmentation and rewelding of the particles. During ball milling, nonequilibrium phases such as supersaturated solid solution, metastable phases, .
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WEBJan 1, 2023 · On the one hand, the amorphization process is in an agreement with the traditional definition due to the predictable stepwise change of XRD peaks during the ball milling. On the other, as mentioned earlier, the obtained simulation results show a continuous change in the diamond cubic crystal structure with a very intense evolution at .
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WEBApr 23, 1999 · Deformation structures and amorphization kinetics of graphite with high crystallinity upon ballmilling (BM) are studied by highresolution transmission electron microscopy (HRTEM) and electron energyloss spectroscopy (EELS). Basal plane stacking disorder, cleavage, delamination cracks, misorientation bands and lowangle (0002) .
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WEBFeb 1, 1990 · Weeber and Bakker8 have recently reviewed amorphization by ball milling. Two major egories of amorphization by ball milling can be identified: 1. Mechanical alloying (MA) of elemental (or dis similar alloy) powders involving material transfer between the components, and 2. Mechanical milling (MM) of a single composition, .
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WEBMay 27, 2013 · Request PDF | BallMillingInduced Amorphization of Zeolitic Imidazolate Frameworks (ZIFs) for the Irreversible Trapping of Iodine | The I2 sorption and retention properties of several existing ...
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