Sökning: "Crystal structures"

Visar resultat 6 - 10 av 534 avhandlingar innehållade orden Crystal structures.

1. 6. Crystallization in Constrained Polymer Structures : Approaching the Unsolved Problems in Polymer Crystallization

   Författare :Eugenia Núñez; Ulf W. Gedde; Bernard Lotz; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Crystallization; Constrained structures; poly ε–caprolactone ; poly ethylene oxybenzoate .; Polymer chemistry; Polymerkemi;

   Sammanfattning : The knowledge regarding certain issues in polymer crystallization e.g. the possible existence of short–lived mesophases remains inconclusive due to experimental limitations. Polymers undergo chain folding upon crystallization, which introduces some complications that are not found in crystallization of low molar mass materials. LÄS MER

3. 7. Metal Organic Frameworks: History, Synthesis, and Topological approach

   Författare :Cédric Borel; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; MOF; crystal structures; crystal engineering; network; coordination chemistry; synthesis; TOPOS; systre; gas storage;

   Sammanfattning : The storage, separation, purification and catalytic reactions of small molecules are important research domains in both pure and applied chemistry, where porous materials play a major role. Among the different possible options for the preparation porous materials a recent approach is to build structures based on metal ions, metal complexes, or metal clusters, bridged by organic ligands. LÄS MER

4. 8. Open-framework Structures Built by Inorganic Clusters : Synthesis and Characterization

   Författare :Hong Chen; Junliang Sun; Xiaodong Zou; Thomas E Albrecht-Schmitt; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Open-framework; germanates; vanadoborates; aluminoborates; germanosilicates; crystal structure; hydrothermal synthesis; crystal X-ray diffraction; rotation electron diffraction; powder X-ray diffraction; Inorganic Chemistry; oorganisk kemi;

   Sammanfattning : Novel open-framework germanates and vanadoborates, which are constructed from typical types of clusters, have been synthesized based on different strategies. The crystal structures are solved by using single crystal X-ray diffraction (SXRD) technique or by combined techniques. LÄS MER

5. 9. Is building molecular solid-state structures as easy as playing with Lego?

   Författare :Cédric Borel; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MOF; framework; crystal structures; network; coordination chemistry;

   Sammanfattning : Crystal engineering is a science dealing with molecular solid-state compounds. One major development in the last ten years has been the description of structures as if they were forming network. In this simplified approach to the structures where atoms, molecules, and molecular ions are replaced by a construction of edges and nodes forming a net. LÄS MER

7. 10. Structural studies of three cell signaling proteins : crystal structures of EphB1, PTPA, and YegS

   Författare :Amin Bakali; Pär Nordlund; Wenqing Xu; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; protein production; structural genomics; cell signaling; Biochemistry; Biokemi;

   Sammanfattning : Kinases and phosphatases are key regulatory proteins in the cell. The disruption of their activities leads ultimately to the abolishment of the homeostasis of the cell, and is frequently correlated with cancer. EphB1 is a member of the largest family of receptor tyrosine kinases. It is associated with neurogenesis, angiogenesis, and cancer. LÄS MER