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Reaction of oxiranes with cyclodextrins under high-energy ...

Reaction of oxiranes with cyclodextrins under high-energy ball-milling conditions. This work presents a proof of concept for a green cyclodextrin derivatisation method that uses low-boiling epoxide reagents in a high-energy ball mill (HEBM). The simplified preparation and purification of low substitution-degree common (2-hydroxy)propylated β ...

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High-energy ball milling of powder B–C mixtures | Alfeu S ...

The present work reports on the preparation of B–10at.% C and B–18at.% C powders by high-energy ball milling and further heat treatment. The milling process was carried out in a planetary ball ...

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Structure and catalytic behaviour of CuO–CeO2 prepared by ...

The molar ratio of CuO in the composite was changed to be 0, 20, 30, 50, 80 and . High-energy vibratory ball milling (Super-Misuni, Nissin Giken Co. Ltd.) was employed, with a rotational speed of 710 r.p.m., where the milling atmosphere was ambient.

  • Author: Hideyuki Okumura, Eiji Yamasue, Keiichi N. Ishihara[PDF]Get Price
Nanoscale grains, high irreversibility field and large ...

a function of ball milling time. We will show that full dopant incorporation was achieved at short milling time (t mill) = 60 min, yet further milling substantially improved the superconducting properties. Extended milling times (600 min or more) resulted in 20– 30 nm grains .

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High-energy ball milling technique for ZnO nanoparticles ...

Jan 01, 2011 · Read "High-energy ball milling technique for ZnO nanoparticles as antibacterial material, International Journal of Nanomedicine" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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Synthesis of AlFe Intermetallic Nanoparticles by High ...

In this investigation, the chemical and microstructural characteristics of nanostructured AlFe intermetallic produced by high-energy ball milling have been explored. High purity elemental powders were used as the starting material. The ball milling was carried out at room temperature using a SPEX-8000 mixer/mill.

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Nanocrystalline metals prepared by high-energy ball milling

Abstract 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 close-packed (hcp) structures are subjected to ball milling, resulting in a decrease of the average grain size to ≈9 nm for metals with bcc and to ≈13 nm for metals with hcp crystal structures.

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High-energy ball milling of B-C-Ti mixtures for the ...

High-energy ball milling of B-C-Ti mixtures for the fabrication of B4C and TiB2 nanocomposite powder L. Nikzada,*, T. Ebadzadehb, M. R. Vaezia and A. Tayebifardc aNanotechnology and advanced material Division, Materials and Energy Research Center, Alborz, Iran bCeramic Division, Materials and Energy Research Center, Alborz, Iran

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The Structure and Mechanical Properties of High-Strength ...

High-energy ball milling was used to prepare the nano-crystalline powder; it was followed by consolidation using spark plasma sintering. During high-energy ball milling, particles are subjected to repeated flattening, cold welding, fracturing and rewelding. When two milling balls collide, a certain amount of powder is trapped

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High-Energy Ball Mill Processing - IPEN

The High-Energy Ball Mill Processing have been used in the last 30 years for processing several materials, including metallic powder alloys, composites, intermetallics and ceramics which can result in nanocrystalline or amorphous materials. Its commercial use appears in the middle of

Preparation of Bi4Ti3O12 (BIT) Ceramics via a High-Energy ...

The High-energy ball milling process is a promising way to prepare BIT ceramics. After the preparation of the BIT, we doped it with the -Walled Carbon Nanotubes which are properly obtained by a chemical vapour deposition (CVD), using nickel as a catalyst, as well as using acetilene at

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Nanocrystalline metals prepared by high-energy ball milling

Abstract 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 close-packed (hcp) structures are subjected to ball milling, resulting in a decrease of the average grain size to ≈9 nm for metals with bcc and to ≈13 nm for metals with hcp crystal structures.

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High-Energy Ball Milling - How is High-Energy Ball Milling ...

lb), then the sample was subjected to high-energy ball milling process at -10[degrees]C in a laboratory type vertical stirring mill and fully ground to fine powder (Fig.

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Reaction of oxiranes with cyclodextrins under high-energy ...

Reaction of oxiranes with cyclodextrins under high-energy ball-milling conditions. This work presents a proof of concept for a green cyclodextrin derivatisation method that uses low-boiling epoxide reagents in a high-energy ball mill (HEBM). The simplified preparation and purification of low substitution-degree common (2-hydroxy)propylated β ...

Get Price
High-Energy Ball Milling by Małgorzata Sopicka-Lizer ...

It involves the use of a high energy ball mill to initiate chemical reactions and structural changes. High energy ball milling: Mechanochemical processing of nanopowders reviews the latest techniques in mechanochemistry and how they can be applied to the synthesis and processing of .

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Effect of high-energy ball milling time on superconducting ...

doping [4–7], high-energy ball milling [8–14] and various mechanical processing techniques [14–17]. Among these methods, high-energy ball milling (HEBM) is a technique which can refine the grain size and induce a large number of grain boundaries acting as effective pinning centers. In addition, high-energy ball milling can result in an ...

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Effect of high-energy ball milling time on superconducting ...

doping [4–7], high-energy ball milling [8–14] and various mechanical processing techniques [14–17]. Among these methods, high-energy ball milling (HEBM) is a technique which can refine the grain size and induce a large number of grain boundaries acting as effective pinning centers. In addition, high-energy ball milling can result in an ...

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Silicon nanoparticles synthesised through reactive high ...

Silicon nanoparticles synthesised through reactive high-energy ball milling: enhancement of optical properties from the removal of iron impurities Li Kuanga, Brian S. Mitchellb and Mark J. Finka* aDepartment of Chemistry, Tulane University, New Orleans, LA 70118, USA; bDepartment of

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Amorphization of selenium induced by high-energy ball milling

54.5 kJ/mol.19 It seems that the amorphous selenium pre- pared by ball milling exhibits a larger activation energy com-pared with the one prepared by rapid quenching, which is the same as the case of Si reported by Gaffet and Harmelin.9 These results indicate that the activation energy for crystal-

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On sinterability of nanostructured W produced by high ...

On sinterability of nanostructured W produced by high-energy ball milling - Volume 22 Issue 5 - R. Malewar, K.S. Kumar, B.S. Murty, B. Sarma, S.K. Pabi. Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our websites.

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