Gels: Structures, Properties, and Functions, Masayuki Tokita; Katsuyoshi Nishinari

Автор: Tezuka Yasuyuki
Название: Topological Polymer Chemistry: Progress Of Cyclic Polymer In Syntheses, Properties And Functions
ISBN: 9814401277 ISBN-13(EAN): 9789814401272
Издательство: World Scientific Publishing
Рейтинг:
Цена: 121440.00 T
Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: Reviews topological polymer chemistry from basic aspects to practice, and gives an overview of cyclic polymers covering fresh synthesis, structure characterization, basic properties/functions and the eventual applications. This title offers opportunities in polymer materials design to create unprecedented properties and functions.

Автор: Anastasescu
Название: 1D Oxide Nanostructures Obtained by Sol-Gel and Hydrothermal Methods
ISBN: 3319329863 ISBN-13(EAN): 9783319329864
Издательство: Springer
Рейтинг:
Цена: 52240.00 T
Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: This book presents wet chemical sol-gel and hydrothermal methods for 1D oxide nanostructure preparation. These methods represent an attractive route to multifunctional nanomaterials synthesis, as they are versatile, inexpensive and, thus, appropriate for obtaining a wide range of oxide materials with tailored morphology and properties. Three specific oxides (SiO2, TiO2, ZnO) are discussed in detail in order to illustrate the principle of the sol-gel and hydrothermal preparation of 1D oxide nanostructures. Other oxides synthesized via this method are also briefly presented. Throughout the book, the correlation between the tubular structure and the physico-chemical properties of these materials is highlighted. 1D oxide nanostructures exhibit interesting optical and electrical properties, due to their confined morphology. In addition, a well-defined geometry can be associated with chemically active species. For example, the pure SiO2 nanotubes presented a slight photocatalytic activity, while the Pt-doped SiO2 tubular materials act as microreactors in catalytic reactions. In the case of titania and titanate nanotubes, large specific surface area and pore volume, ion-exchange ability, enhanced light absorption, and fast electron-transport capability have attracted significant research interest. The chemical and physical modifications (microwave assisted hydrothermal methods) discussed here improve the formation kinetics of the nanotubes. The ZnO nanorods/tubes were prepared as random particles or as large areas of small, oriented 1D ZnO nanostructures on a variety of substrates. In the latter case a sol-gel layer is deposited on the substrate prior to the hydrothermal preparation. Using appropriate dopants, coatings of ZnO nanorods with controlled electrical behavior can be obtained.