884 resultados para nano-assemblies
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Mode of access: Internet.
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Master microform held by: LCP.
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Advertisement: p. [1] at end.
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Mode of access: Internet.
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Book 1: 3d ed.; book 2: 2d ed.
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Mode of access: Internet.
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At head of title : Lex parliamentaria americana.
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"1 May 1972."
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"April 1959."
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Includes indexes.
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Includes index.
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Includes index.
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"October 1968."
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A novel method to prepare mesoporous zirconia was developed. The synthesis was carried out in the presence of PEO surfactants via solid-state reaction. The materials exhibit strong diffraction peak at low 2-theta angle and their nitrogen adsorption/desorption isotherms are typical of IV type with H3 hysteresis loops. The pore structure examined by TEM can be described as wormhole domains. The tetragonal zirconia nanocrystals are uniform in size (around 1.5nm) and their pores center at around 4.6nm. The zirconia nanocrystal growth is mainly via an aggregation mechanism. This study also reveals that the PEO surfactants can interact with the Zr-O-Zr framework to reinforce the thermal stability of zirconia. The ratio of NaOH to ZrOCl2, crystallization and calcination temperature play an important role in the synthesis of mesoporous zirconia.