National University of Singapore

Agency for Science, Technology and Research

John Wang

Junmin Xue

Jun Ding

Dan Zhao

How Yong Ng

Leong Ming Gan

Leong Chew Lim

Ser Choon Ng

Anthony Kevin Cheetham

Tze Chiang Albert Ng

Pieremanuele Canepa

Zhiyang Lyu

Zeyu Deng

Dongmei Wan

Fengxia Wei

Anthony Zhaohui Zhou

Dinesh Mullangi

Yuxiang Wang

Discloses herein is an activated metal-organic framework of formula as defined in the application, and the metal organic framework has a BET surface area of from 250 to 1,000 m/g as obtained from a 298 K COsorption isotherm. In a particular embodiment, the activated metal-organic framework is aluminium formate (Al(HCOO)) or vanadium formate (V(HCOO)).

Simple metal-organic framework for the selective adsorption of carbon dioxide from flue gas

There is provided an inorganic hierarchical porous membrane comprising at least two layers, wherein each layer of the at least two layers comprises a different average pore size as compared to another layer of the at least two layers, and wherein the membrane comprises a patterned surface. There is also provided a method of forming the membrane.

Inorganic porous membrane

Heterolayered thin films having ferroelectric/piezoelectric layers of alternating crystal structures and methods of their preparation are provided. In the ferroelectric/piezoelectric thin film, a first layer has a rhombohedral crystal structure and a second layer adjacent the first layer has a tetragonal crystal structure. The layers have a (100) preferred orientation with &#x3b1;-axis normal to the surface of the film. The first layer can be a Zr-rich lead ziroconate titanate layer (e.g., PbZrTiO) and the second layer can be a Ti-rich PZT layer (e.g., PbZrTiO). Heterolayered ferroelectric/piezoelectric thin film comprising a plurality of such first and second layers in alternating sequence exhibits particularly improved electrical properties.

Heterolayered ferroelectric thin films and methods of forming same

Mechanochemical fabrication produces electroceramics using oxides as starting materials. The fabrication starts with mixing industrial ceramic oxide powders. Electroceramic phases are formed by reacting the oxide powders in a mechanochemical chamber, which is a wear-resistant cylindrical vial with one or more solid balls inside. The formation of electroceramic phases of pervoskite structure and fine crystallinity are activated by mechanical energy or a combination of mechanical energy and thermal energy. Sintered electroceramic materials and components are fabricated when compacts or green bodies made of the resulting ceramic powders are densified at the sintering temperature. The technique can fabricate a wide range of PbO-based ceramics such as Pb(Mg Nb )O (PMN), Pb(Mg Nb ) O -PbTiO (PMN-PT), Pb(Mg Nb ) O -Pb(Zn Nb )O -PbTiO (PMN-PZN-PT), and other PMN-based relaxor ferroelectrics, Pb(Zr Ti )O (PZT) and PZT-based piezoelectrics at sintering temperatures as low as 900&deg; C.

Mechanochemical fabrication of electroceramics

A method for producing electroceramic materials of high sintered density from hydroxide and/or oxalate precursors is disclosed. In this method the precursor(s) are compacted to form a preform, thermally treated, recompacted and then sintered to form finished products.

Method for producing sintered electroceramic materials from hydroxide and oxalate precursors

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Singapore, Singapore

John Wang