Direct preparation and conversion of copper hydroxide-based monolithic xerogels with hierarchical pores
Direct preparation and conversion of copper hydroxide-based monolithic xerogels with hierarchical pores
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DOI：
10.1039/c5nj00479a
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发表时间：
2015-01-01
影响因子：
3.3
通讯作者：
Kanamori, Kazuyoshi
中科院分区：
文献类型：
--
作者：
Fukumoto, Shotaro;Nakanishi, Kazuki;Kanamori, Kazuyoshi
以离子前驱体CuCl2中心点2H(2)O为原料，采用溶胶-凝胶法直接制备了具有可控分层孔的铜基单片干凝胶。在反应溶液中，环氧丙烷通过均匀地增加pH值来作为凝胶诱导剂。聚丙烯酰胺不仅用于宏观的相分离控制，而且在物理上支持网络。甘油通过抑制氢氧化铜晶体的生长来促进整体凝胶的形成。适当的起始成分导致凝胶骨架和大孔的共连续。虽然干燥后的凝胶是无定形的，但后处理（煅烧和溶剂热处理）形成了金属铜和铜氧化物（CuO和Cu2O），而没有破坏整体形态和宏观结构。
Copper hydroxide-based monolithic xerogels with controlled hierarchical pores have been prepared directly by a sol-gel process from an ionic precursor, CuCl2 center dot 2H(2)O. Propylene oxide acts as a gelation inducer by increasing pH homogeneously in a reaction solution. Poly(acrylamide) is utilized not only to control macroscopic phase separation but also to support the network physically. Glycerol contributes to the formation of monolithic gels by suppressing the growth of copper hydroxide crystals. An appropriate starting composition leads to co-continuous gel skeletons and macropores. Although the as-dried gels were amorphous, post-treatments (calcination and solvothermal treatment) formed metallic copper and copper oxides (CuO and Cu2O) without the collapse of the monolithic form and macrostructure.