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 Colloidal Synthesis of Copper Nanoparticles. Investigation on Nanofabrication in a Two-phase Liquid-liquid System
Наименование:

Colloidal Synthesis of Copper Nanoparticles. Investigation on Nanofabrication in a Two-phase Liquid-liquid System

автор Nafiseh D. издательство Книга по Требованию Другие общетехнические дисциплины
Cтраниц 128        мягкая обложка       
Аннотация:Several modifications were made to the original recipe to produce copper nanoparticles with high degrees of purity and stability. Synthesis of copper nanoparticles by a colloidal recipe in a two-phase liquid-liquid mixture (toluene/water) was investigated. This method involves transferring metal cations from the aqueous layer to the organic one by the phase transfer reagent, tetraoctylammonium bromide, followed by reduction with sodium borohydride in the presence of oleylamine, which was used as the stabilising ligand. The synthesis recipe used in this work was originally applied for the fabrication of alkylamine-capped gold nanoparticles. Going through the results and discussion provided in this book, the reader understand the challenges that one may cope with while conducting colloidal nanofabrication of active metals, such as copper. Copper nanoparticles are potentially applicable in various industries and are considered as an alternative for expensive metal nanoparticles, such as gold, silver, and platinum. Due to the high tendency of copper for oxidation, all of the synthesis experiments were carried out in a glove box under the flow of an inert gas (N2 or Ar).
Автор: Nafiseh D.
Издательство: Книга по Требованию
Год:2009
Цена:
2402 руб
Нет в наличии
Поиск: Colloidal Synthesis of Copper Nanoparticles. Investigation on Nanofabrication in a Two-phase Liquid-liquid System
НОВЫЙ ГОД СИМВОЛ 2013 ГОДАУКРАШЕНИЯ
КАРНАВАЛ НА НОВЫЙ ГОД РАСПРОДАЖА
Ортомолекулярная медицина Orthomol Устрание причин заболеваний. Ортомоль это новый метод для лечения и профилактики болезней. Orthomol - ортомолекулярная медицина.
Технология PLC (Power Line Communication)

В случае же ортогонального частотно-разделенного мультиплексирования (OFDM), центры поднесущих частот размещены так, что пик каждого последующего сигнала совпадает с нулевым значением предыдущих (рис.3). Такое размещение позволяет более эффективно использовать доступную полосу частот. Перед тем как отдельные поднесущие частоты будут объединены в один сигнал, они претерпевают фазовую модуляцию (рис.4), каждая -- своей последовательностью бит. После этого все они проходят через PowerPacke e gi e и собираются в единый информационный пакет, который еще называют OFDM-symbol. На рисунке 5 приведен пример относительной квадратурной фазовой манипуляции (DQPSK - Differe ial Quadra ure Phase Shif Keyi g) на каждой из 4-х поднесущих частот в диапазоне 4-5 МГц. Реально в технологии Powerli e используются 84 поднесущие частоты в диапазоне 4-21 МГц (рис.6). Теоретическая скорость передачи данных при использовании параллельных потоков с одновременным фазовым модулированием сигналов составляет более 100 Мб/с. Адаптация к физической среде, устранение ошибок и разрешение конфликтов. При передаче сигналов по бытовой сети электропитания могут возникать большие затухания в передающей функции на определенных частотах, что приведет к потере данных (рис. 7).] В технологии Powerli e предусмотрен специальный метод решения этой проблемы -- динамическое выключение и включение передачи сигнала (dy amically ur i g off a d o da a-carryi g sig als).
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