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Nanocrystalline aluminium oxide: a mild and efficient reusable catalyst for the one-pot synthesis of poly-substituted quinolines via Friedlander hetero-annulation; Nanocrystalline Al‒Fe alloys synthesized by high-energy ball milling; Nanocrystalline bioactive TiO 2–chitosan impedimetric immunosensor for ochratoxin-A

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Preparation of nanocrystalline materials by high-energy ...

Materials Science and Engineering A 386 (2004) 442–446 Preparation of nanocrystalline materials by high-energy milling P. Bal´azˇ a,∗, E. Godoˇc´ıkov´aa, L. Kril'ov´aa, P. Lobotkab, E. Gockc a Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04353 Koˇsice, Slovakia b Institute of Electrical Engineering, Slovak Academy of Sciences, D´ubravsk´a cesta …

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Nanocrystalline Materials: Synthesis, Characterization ...

Thermal stability of nanocrystalline Al-5at.%Ni and Al-5at.%V alloys produced by high-energy ball milling journal, May 2018 Esquivel, J.; Wachowiak, M. G.; O'Brien, S. P. Journal of Alloys and Compounds, Vol. 744

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DUGi: Ítem | Recercat - Synthesis and Characterization of ...

This work deals with the microstructural properties of the Al-20 at. % Cu alloy prepared by high-energy ball milling of elemental aluminum and copper powders. The ball milling of powders was carried out in a planetary mill in order to obtain a nanostructured Al-20 at. % Cu alloy.

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High energy ball milling process for nanomaterial synthesis

For all nanocrystalline materials prepared by high-energy ball milling synthesis route, surface and interface contamination is a major concern. In particular, mechanical attributed contamination by the milling tools (Fe or WC) as well as ambient gas (trace impurities such as O 2, N 2 in rare gases) can be problems for high-energy ball milling.

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Structural, Microstructural Characterisation and Magnetic ...

The mechanical alloying experiments were performed using a faro-planetary high-energy ball mill (Retsch PM 400). In order to ensure that the milling will be performed in an inert atmosphere (no oxidation during the milling), the starting powders with five (05) stainless steel balls, having 12 mm in diameter, were sealed in atmosphere of azote ...

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Fecht, H.J., Hellstern, E., Fu, Z. and Johnson, W.L. (1990 ...

Fecht, H.J., Hellstern, E., Fu, Z. and Johnson, W.L. (1990) Nanocrystalline Metals Prepared by High-Energy Ball Milling. Metallurgical and Materials Transactions A ...

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Nanocrystalline 6061 Al Powder Fabricated by Cryogenic ...

Nanocrystalline 6061 Al alloy was synthesized by cryogenic milling (cryomilling). Both transmission electron microscopy and X-ray diffraction were used to monitor the change in grain size as a function of milling time. The results of both techniques demonstrated a close agreement with respect to two observations: (a) during cryomilling, the grain size of 6061 Al decreased …

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Nanocrystalline metals prepared by high-energy ball milling

Nanocrystalline Metals Prepared by High-Energy Ball Milling H.J. FECHT, E. HELLSTERN, Z. FU, and W.L. JOHNSON This is a first systematic report on the synthesis of completely nanocrystalline metals by high-energy deformation processes. Pure metals with body-centered cubic (bcc) and hexagonal

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Investigation of typical properties of nanocrystalline ...

On the other hand, the milling time is directly related to energy use as well as the purity of the obtained powder products. This paper presents the results of investigation on some typical properties of nanocrystalline iron powders prepared by milling techniques using a Fritsch P-6 planetary ball miller.

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Synthesis and characterization of CuInS2 nanocrystalline ...

12%Nanocrystalline CuInS 2 particles have been synthesized from copper, indium, and sulfur powders by high-energy …

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Microstructure and magnetic properties of dilute ...

The microstructure and magnetic properties of nanocrystalline Fe-Si soft magnetic material fabricated by high energy vibratory milling are investigated. Fe-Si × wt% (x = 1.78, 3.51, 3.80, 5.08, 6.06, 6.98, 8.04) compositions are studied, with the 3.5 wt% case being used as a model system to investigate effects of processing time. X-ray diffraction (XRD) measurements …

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Corrosion Behavior in Highly Concentrated Sodium Chloride ...

Solutions of Nanocrystalline Aluminum Processed by High Energy Ball Mill El-Sayed M. Sherif 1,2,*, Jabair Ali Mohammed 1 and Hany S. Abdo1,3and Abdulhakim A. Almajid1,4 1Center of Excellence for Research in Engineering Materials (CEREM), Advanced Manufacturing Institute, King Saud University, P. O. Box 800, Al-Riyadh 11421, Saudi Arabia

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(PDF) CO sensitive nanocrystalline LaCoO3 perovskite ...

The high energy milling was performed at 1000 rpm for 2 h. The as-milled powders were highly agglomerated with a low SSA (<4 m 2 /g). A second milling step with lower energy and different milling times was performed in order to increase the specific surface area. A laboratory attritor containing 4.5 mm hardened steel balls was used in this step.

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Nanocrystalline metals prepared by low energy ball milling ...

The influence of low energy ball milling on the crystallite size, lattice strain, and storage of deformation energies of elemental metal powders is studied. The formation of nanosized grains (5–25 nm) and enhancement of lattice strain up to 0.4% is found. Excess enthalpies of up to 25% of the heat of fusion are reached.

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Milled goethite nanocrystalline for selective and fast ...

Goethite nanocrystallines powders were prepared by high-energy ball milling with a balls-to-powder mass ratio of 10:1 and for 40 h of milling. X-ray diffraction, Rietveld analysis, and vibrating sample magnetometer are used to characterize the obtained nanopowders followed by tests for toxic metals removal from aqueous solutions.

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Atomic-scale structure of nanocrystalline ZrO{sub 2 ...

U.S. Department of Energy Office of Scientific and Technical Information. Search terms: ... Atomic-scale structure of nanocrystalline ZrO{sub 2} prepared by high-energy ball milling. Atomic-scale structure of nanocrystalline ZrO{sub 2} prepared by high-energy ball milling. Full Record;

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Electrical and magnetic properties of nanocrystalline ...

Electrical and magnetic properties of nanocrystalline BiFeO3 prepared by high energy ball milling and microwave sintering. Prasad ChS(1), Sreenivasulu G, Kiran SR, Balasubramanian M, Murty BS. Author information: (1)Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Madras, Chennai 600036, India.

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The structure of nanocrystalline NiAl powders prepared by ...

Micronmeter-sized powders of NiAl were mechanically worked in a high-energy ball-mill for times up to 40 h. The X-ray diffraction patterns indicate that the powders retained the CsCl-type (B2) structure when milled up to 40 h. The broadening of the powder pattern peaks increased with increasing ball-to-powder ratio. For a ball-to-powder ratio of 10:1, the particle sizes, …

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Anion diffusivity in highly conductive nanocrystalline ...

We report on the fluorine diffusivity in nanocrystalline BaF 2 and CaF 2 as well as in BaF 2:CaF 2 composites prepared by high-energy ball milling.Mechanical treatment of polycrystalline BaF 2 together with CaF 2 results in a nanocrystalline composite with an unexpectedly high dc conductivity of about 0.1 mS cm −1 at 450 K. X-ray diffraction and 19 F magic angle spinning …

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preparation of nanoionics by ball milling

As the name suggests, the ball milling method consists of balls and a mill chamber. Therefore over all a ball mill contains a stainless steel container and many small iron, hardened steel, silicon carbide, or tungsten carbide balls are made to rotate inside a mill (drum).Preparation of WC nanoparticles by twice ball milling ..., In ...

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Combustion and Ball Milled Synthesis of Rare Earth Nano ...

This paper reports a study on nanocrystalline ceria powder prepared by high energy ball-milling and combustion syn-thesis methods. The combustion synthesis was carried out using ceric ammonium nitrate as oxidizer and citric acid, glycine or citric acid plus glycine as fuel. The minimum crystallite size of ceria powder is obtained by combustion syn-

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Structure and magnetic properties of nanocrystalline ...

In this current study, nanocrystalline Dy powders were prepared by melt-spinning and subsequent high-energy ball-milling. The effect of ball-milling time on the structure and magnetic properties of the powders was studied. The crystal structure and microstructure of the melt-spun ribbons and ball-milled powders were observed by X-ray …

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Nanocrystalline metals prepared by high-energy ball ...

Nanocrystalline metals prepared by high-energy ball milling Fecht, H. J. Hellstern, E. Fu, Z. Johnson, W. L. Abstract This is a first systematic report on the synthesis of completely nanocrystalline metals by high-energy deformation processes.

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Nanocrystalline metals prepared by low energy ball milling ...

The influence of low energy ball milling on the crystallite size, lattice strain, and storage of deformation energies of elemental metal powders is studied. The formation of nanosized grains (5-25 nm) and enhancement of lattice strain up to 0.4% is found. Excess enthalpies of up to 25% of the heat of fusion are reached.

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Preparation of nanocrystalline materials by high-energy ...

Various types of nanocrystalline materials have been prepared using high-energy milling. Bismuth–ceramic (Bi/MgO, Bi/Al2O3, Bi/SiO2) and copper–iron …

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Transformation of Goethite to Hematite Nanocrystallines by ...

Conclusion. α -Fe 2 O 3 nanocrystalline was successfully prepared by high-energy ball milling of goethite ( α -FeOOH) powder after 40 hours of milling. The mechanochemical effect induced by high energy ball milling induced dehydration and transformation of goethite to hematite. This work shows that this method is environmentally …

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CO sensitive nanocrystalline LaCoO3 perovskite sensor ...

High energy ball milling (HEBM) is another promising synthesis route capable of synthesizing nanostructured mixed oxides at quasi room temperature. Mechanical impact during the process reduces the precursors' crystallite size to nano scale, provides a homogeneous mixture, and enhances the solid state diffusion.