Polyimide/metal composite films via in situ decomposition of inorganic additives: Soluble polyimide versus polyimide precursor

1988 ◽  
Vol 3 (5) ◽  
pp. 996-1001 ◽  
Author(s):  
J. D. Rancourt ◽  
G. M. Porta ◽  
E. S. Moyer ◽  
D. G. Madeleine ◽  
L. T. Taylor
Keyword(s):  
Metal Oxide ◽  
Composite Films ◽  
Metal Composite ◽  
Air Interface ◽  
Reaction Matrix ◽  
Soluble Polyimide ◽  
Metal Migration ◽  
In Situ Decomposition ◽  
Polyimide Precursor

Polyimide-metal oxide (Co3O4 or CuO) composite films have been prepared via in situ thermal decomposition of cobalt (II) chloride or bis (trifluoroacetylacetonato) copper (II). A soluble polyimide (XU-218) and its corresponding prepolymer (polyamideacid) were individually employed as the reaction matrix. The resulting composites exhibited a greater metal oxide concentration at the air interface with polyamideacid as the reaction matrix. The water of imidization that is released during the concurrent polyamide acid cure and additive decomposition is believed to promote metal migration and oxide formation. In contrast, XU-218 doped with either HAuCl4 · 3H2O or AgNO3 yields surface gold or silver when themolyzed (300 °C).

Preparation of Supported Zeolite Films and Layers: Processing of Zeolite Suspensions and In Situ Growth from Homogeneous Solutions

1996 ◽  
Vol 431 ◽  
Author(s):  
Mark C. Lovallo ◽  
Laura Boudreau ◽  
Michael Tsapatsis
Keyword(s):  
High Selectivity ◽  
Porous Alumina ◽  
Composite Films ◽  
In Situ Growth ◽  
Good Adhesion ◽  
Homogeneous Solutions ◽  
Zeolite L ◽  
Alumina Composite ◽  
Zeolite Films

AbstractThe influence of microstructure on the properties of zeolite films and means of controlling the former (film thickness, crystal orientation) are the theme of this report. Firstly, the formation of thin silicalite films from regrowth of nanocrystalline silicalite/alumina composite films is presented. The crystallites at the intergrown top layer are oriented with their straight channels parallel to the substrate film. The membranes show H2/N2 selectivities of about 60 at 150 °C.This high selectivity is attributed to the orientation of the separating layer. Secondly, the formation of oriented multilayers of zeolite L crystallites by alternating dippjpg of a glass substrate in a bohemite and a “plate-like” zeolite L suspensions is illustrated. Finally, continuous films of zeolite NaA are prepared on various substrates (glass, porous and nonporous alumina) using in situ growth from homogeneous solutions. The films exhibit good adhesion to the substrates. The films prepared on porous alumina disks show He/N2 and O2/N2 selectivities of 10 and 0.4 respectively at 120 °C.

Highly toughened dense TiC–Ni composite by in situ decomposition of (Ti,Ni)C solid solution

2015 ◽  
Vol 41 (3) ◽  
pp. 4656-4661 ◽  
Author(s):  
Hanjung Kwon ◽  
Sun-A. Jung ◽  
Chang-Yul Suh ◽  
Ki-Min Roh ◽  
Wonbaek Kim ◽  
...  
Keyword(s):  
Solid Solution ◽  
In Situ Decomposition

Highly-efficient and autocatalytic reduction of NaHCO3 into formate by in situ hydrogen from water splitting with metal/metal oxide redox cycle

2017 ◽  
Vol 26 (5) ◽  
pp. 881-890 ◽  
Author(s):  
Guodong Yao ◽  
Jia Duo ◽  
Binbin Jin ◽  
Heng Zhong ◽  
Lingyun Lyu ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Water Splitting ◽  
Redox Cycle ◽  
Highly Efficient ◽  
Metal Metal
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