Development of a titanium tungstate-based 188W/188Re gel generator using tungsten of natural isotopic abundance

The feasibility of developing titanium tungstate-based 188W/188Re gel generator using tungsten of natural isotopic abundance irradiated in a moderate flux reactor has been investigated. Influence of temperature, pH and eluent concentration on generator performance was studied. It was found that ‘‘post-formed’’ approach allows to construct gel generators with elution performance and 188Re elution yields very close to those of conventional alumina 188W/188Re generator. Curie-level 185W radionuclidic impurity presents a challenge during the processing of target material and subsequent elution of the generator. In the future use of semi-enriched with 186W target material (50–60% enrichment) would be beneficial in the development of titanium tungstate-based 188W/188Re gel generators. 2002 Elsevier Science Ltd. All rights reserved

Design of three-dimensional open-framework structures from inorganic clusters

A series of open-framework germanates and silicogermanates were synthesized (denoted as SU-n) hydro-/solvo-thermally. Their structures were built from a single or two types of inorganic clusters containing a number of well-defined Ge-O coordination polyhedra. Different arrangements and combinations of these clusters resulted in different open-framework structures including some germanate/silicogermanates with extra-large pores (16- 24 rings). Herein we present our recently discovered crystalline structures of SU-3, SU-8, SU-12, SU-44, SU-M and SU-MB. SU-M and SU-MB contain 30-ring channels and pores extending to the mesoporous range (> 20). © 2007 Elsevier B.V. All rights reserved

Design of open-framework germanates by combining different building units.

Open-framework germanates with extra-large channels are built from two different types of clusters. The two different clusters are connected in such a way to form a pseudo-body-centered cluster aggregate (PBCCA). The different packing of PBCCAs resulted in different 3D open-framework germanates