نتایج جستجو برای: graphite particles

تعداد نتایج: 170379  

2009
Hsiangpin Chang Allen J. Bard

The oxidation of highly oriented pyrolytic graphite (HOPG) in air at elevated temperatures was studied by examination of the oxidized HOPG by scanning tunneling microscopy (STM). Etch pits of uniform size and monolayer depth were readily formed on preexisting defects or generated vacancies in the HOPG basal plane by heating freshly cleaved HOPG samples in air at 650 OC. The density of the pits ...

2012
A. Dehbi S. Martin Paul Scherrer

The Generation IV Pebble Bed Modular Reactor (PBMR) is being considered as a promising concept to produce electricity or process heat with high efficiencies and unique safety features. The PBMR is a high-temperature, helium-cooled, graphite moderated reactor. The fuel elements consist of 6 cm diameter spherical graphite “pebbles” containing each thousands of uranium dioxide microspheres. As the...

2016
Yulia Perets Lyudmila Matzui Lyudmila Vovchenko Irina Ovsiienko Olena Yakovenko Oleksandra Lazarenko Alexander Zhuravkov Oleksii Brusylovets

In the present work, we have investigated concentration and temperature dependences of electrical conductivity of graphite nanoplatelets/epoxy resin composites. The content of nanocarbon filler is varied from 0.01 to 0.05 volume fraction. Before incorporation into the epoxy resin, the graphite nanoplatelets were subjected to ultraviolet ozone treatment at 20-min ultraviolet exposure. The electr...

2015
L. Gordon D. Johnson Lawrence Livermore

Dielectric: materials commonly used as insulators in spark gaps (Lexan, Nylon, Lucite, Macor, Boron Nitride, Delrin and G-10) have been exposed to the by-products of arcs in three different spark gap experiments. The first was a 60 kV, 0.05 Caul/shot spark gap using copper-tungsten or graphite electrodes at various pressures of N2 or SF6 gas. The second was a 5-30 kV, 4-25 kA, .l-.6 Coul/shot, ...

2016
Minseong Ko Sujong Chae Jiyoung Ma Namhyung Kim Hyun-Wook Lee Yi Cui

Existing anode technologies are approaching their limits, and silicon is recognized as a potential alternative due to its high specific capacity and abundance. However, to date the commercial use of silicon has not satisfied electrode calendering with limited binder content comparable to commercial graphite anodes for high energy density. Here we demonstrate the feasibility of a next-generation...

Journal: :Journal of The Electrochemical Society 2023

When charging or discharging a lithium-ion-battery (LIB), lithiation delithiation of the electrodes takes place. Especially in case anode active materials, often leads to significant volume increase. The latter can cause rearrangement particles. Although volumetric changes state-of-the-art cathode materials have been found be smaller than for anodes, they remain relevant. combined anodes and ca...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور مرکز - دانشکده علوم 1391

سنتز پلیمرهای کوئوردیناسیونی جدید از لیگاندهای 2-آمینو نیکوتینیک اسید، 2-کینولین کربوکسیلیک اسید، 2-پیرازین کربوکسیلیک اسید در ابعاد توده، با روش گرایان دمایی و با استفاده از شاخه ی جانبی انجام شده است، این پلیمرها توسط روش طیف سنجی ir شناسایی و پایداری گرمایی آن ها توسط تجزیه های وزن سنجی حرارتی (tga) و تجزیه ی گرمایی تفاضلی (dta) بررسی شده است. در ادامه، ساختار این ترکیبات توسط بلورنگاری پرتو...

2008
Shinya IWASHITA Hiroshi MIYATA Kazunori KOGA Masaharu SHIRATANI Naoko ASHIKAWA Kiyohiko NISHIMURA Akio SAGARA

To obtain information on formation mechanisms of dust particles of nm in size in fusion devices, in-situ collection of dust particles produced due to interaction between graphite target as plasma facing materials and the plasmas was carried out in a helicon discharge chamber and in Large Helical Device (LHD). Dust particles produced in the helicon discharges are made of carbon and can be classi...

2013
Fitria Rahmawati Liviana Wijayanti

This research study the application of the immobilized TiO2 layer and Cu-TiO2 layer on graphite substrate as a negative electrode or anode for Li-ion battery. The titania layer was produced through chemical bath deposition method, meanwhile Cu particles were deposited electrochemically. A material can be used as an electrode as it has capability to intercalates Li ions into its crystal structur...

2015
José Covas Eunice Cunha Maria C. Paiva Loic Hilliou

Graphite nanoplates (GnPs) are exfoliated graphite particles in the form of thin flakes—with large surface areas and nanosized thicknesses— that tend to agglomerate because of van der Waals interactions. GnPs are commonly used to reinforce composite materials. It is expected that maximum composite performance levels should occur when GnP agglomerates are dispersed within the polymer matrix as p...

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