Search Results

You are looking at 1 - 10 of 2,610 items :

  • "microporous" x
Clear All

DOI 10.1515/revic-2012-0003   Rev Inorg Chem 2012; 32(2-4): 81–100 Yao Chen and Shengqian Ma * Microporous lanthanide metal-organic frameworks Abstract: Microporous metal-organic frameworks (MOFs) based on lanthanide metal ions or clusters represent a group of porous materials, featuring interesting coor- dination, electronic, and optical properties. These attractive properties in combination with the porosity make microporous lanthanide MOFs (Ln-MOFs) hold the promise for various applications. This review is to provide an overview of the

Letter Microporous gold: Comparison of textures from Nature and experiments Victor M. okrugin1,2, eLena andreeVa1,2, BarBara etschMann3,4, aLLan Pring3, kan Li4, Jing Zhao3,4, grant griffiths5, gregory r. LuMPkin5, gerry triani5 and JoëL Brugger3,6,* 1Institute of Volcanology and Seismology, Russian Academy of Science, Petropavlovsk-Kamchatsky, 683 006, Russia 2Vitus Bering Kamchatka State University Petropavlovsk-Kamchatsky, 683 006, Russia 3Mineralogy, South Australian Museum, North Terrace, Adelaide, 5000, South Australia, Australia 4School of Chemical

4 ) 7 (H 2 O) 2 ] 13.53 Krivovichev and Burns [ 20 ] (C 4 H 10 N) 8 [(UO 2 ) 5 (SO 4 ) 9 ](H 2 O) 13.66 Bharara and Gorden [ 16 ] [(UO 2 )(HSO 4 ) 2 ] 15.11 Betke and Wickleder [ 21 ] α-[(UO 2 )(MoO 4 )]·2H 2 O 15.43 Serezhkin et al. [ 2 ] [(UO 2 )(SO 4 )] 16.58 Brandenburg and Loopstra [ 22 ] [(UO 2 )(S 2 O 7 )] 17.85 Betke and Wickleder [ 21 ] Here we report first cases of microporous framework structures containing uranium and chromium. Rb 2 [(UO 2 ) 2 (CrO 4 ) 3 (H 2 O) 2 ](H 2 O) 3 ( 1 ) was crystallized from uranyl chromate solution by evaporation. Further

microporous silicate of the rhodesite group, and a partially dehydrated phase obtained by heating the as-prepared compound at 200 °C, have been isolated and their structure found to be closely related with the structure of mineral montregianite. This prolific mineral series shows many outstanding features of the intriguing chemistry of silicates and provides food for thought for engineering luminescent centers in materials. Acknowledgments We would like to thank Fundação para a Ciência e a Tecnologia (FCT, Portugal), the European Union, QREN, FEDER and COMPETE. This work

Volume 6, Issue 3 2010 Article 8 International Journal of Food Engineering Preparation of a Micro-Porous Alginate Gel Using a Microfluidic Bubbling Device Sergey Martynov, University College London Xiaoliang Wang, Sichuan University Eleanor P. Stride, University College London Mohan J. Edirisinghe, University College London Recommended Citation: Martynov, Sergey; Wang, Xiaoliang; Stride, Eleanor P.; and Edirisinghe, Mohan J. (2010) "Preparation of a Micro-Porous Alginate Gel Using a Microfluidic Bubbling Device," International Journal of Food Engineering: Vol. 6

crystals were absolutely rigid. In this paper we review the role of phonons in structural transformations occurring in crystalline microporous materials, in particular, those observed during adsorption of guest molecules [ 2 ], [ 3 ], [ 4 ], [ 5 ], [ 6 ], [ 7 ], [ 8 ]. Although the structural transformations in flexible nanoporous systems have already been summarized in several papers [ 2 ], [ 3 ], [ 4 ], [ 5 ], [ 6 ], [ 7 ], [ 8 ], [ 9 ], [ 10 ], the role of the phonons, and in particular, their contribution to the deformation mechanism, has been rarely mentioned [ 11

Introduction Many attempts have been made to modify the physical and catalytic properties of zeolite frameworks by the incorporation of transition-metal ions [1, 2]. These efforts led to the discovery of a number of porous structures formed from both silicate tetrahedra and transition-metal-centered polyhedra [3–8]. Prominent examples include the microporous titanium silicates ETS-10 containing TiO 6 octahedra [9–11], and ETS-4, a synthetic analog of the mineral zorite, containing both TiO 6 octahedra and TiO 5 pyramids [12]. Our previous work showed that the

The field of crystalline microporous materials is burgeoning. Zeolites, the most traditional members of this category, found their way into large-scale industrial applications more than 50 years ago and can thus be considered to be “mature” materials. However, even within this group, the last two decades have seen disruptive developments, such as the synthesis of zeolites with very large pore openings, the use of new characterisation techniques to understand their properties, e.g. in the field of in-situ and operando studies, and their application in new

scaffolds, etc. [ 4 , 5 , 6 , 7 ]. In this context, bone tissue engineering technology emerges and provides a new solution for the treatment of bone defects. Tissue engineering scaffolds usually have complex microporous structures to provide more adherent area for cells. After the tissue engineering scaffold with living cells and growth factors is implanted into the defect site, the scaffold degrades gradually and the cells continuously proliferate and differentiate to form new bone tissue to repair the defect in the body [ 8 ]. Bone tissue engineering has abundant graft

, particularly those containing appreciable K + (i.e., layer silicates and feldspars), N can be retained to great depths in the continental crust and carried to even greater depths at subduction zones. We consider briefly the avenues for the incorporation of initially organic N into silicate materials (minerals and glasses) during diagenesis and seafloor alteration, as this process, followed by burial and subduction, largely governs the nature of the crust and upper-mantle N reservoirs. In this context, we also present new N isotope data for the microporous silicates beryl