1996 MRS Spring Meeting Echoes Call of Materials Community
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er 2500 oral and poster presentations were given at the MRS 1996 Spring Meeting in San Francisco.
mesoporous molecular sieves. In accord with this interest, Symposium P covered major advances in synthesis, characterization, and exploitation of the possible mechanisms of formation of porous materials. Central to this topic is controlling the porosity such as by organic derivatization of silica gel surfaces, use of organic templates, and capillary stress control. Synthesis of a new zeolite was reported in which pentamethylcobaltacinium cation has been used to template the structure. Although complete details of the new structure were not given, it was hinted that this material may be the first zeolite with a larger than 12 T-atom ring.
The 7th symposium in the series on Better Ceramics Through Chemistry (Symposium V) narrowed its focus and concentrated on synthesis, structure, and properties of organic/inorganic hybrid materials. Several groups have achieved molecular scale porosity by plasma or thermal pyrolysis of organic moieties. Ceramiclike hardness and polymer-like processability have been combined to achieve adherent coatings with impressive scratch resistance. Toughness can be improved for instance by adding siloxane chains to porous silicate aerogels, or chloroplasts can be added to other materials for photosynthesis. Symposium W, Computational Materials Science—Structural, Mechanical, and Transport Properties, aimed to bridge size and time scales by linking approaches ranging from quantum methods used for electronic structure and atomic force models to macroscopic methods employing finite element analysis used to understand mechanical and thermal properties. It was frequently observed that modeling the behavior of
advanced materials required the use of hybrid computational techniques in order to span a vast range of length and time scales. Layered materials and systems based on metallic, intermetallic, polymeric, and ceramic constituents are finding use as thermal barrier coatings, aircraft structural components, and wear resistant coatings. Symposium U, Layered Materials for Structural Applications, presented a spectrum of processing techniques such as ebeam deposition, reactive sputter deposition, sedimentation processing, pressureless co-sintering, and rapid prototyping. The mechanical behavior and modeling of layered systems revealed significant effects of layer thickness, spacing, and constituent properties on fracture and fatigue behavior of such systems. Of particular interest in Symposium CC, Thin Films: Stresses and Mechanical Properties VI, was a joint study at the Naval Research Laboratory and the University of Minnesota, which gave a staircase load displacement profile in gold single crystals somewhat at variance with previous studies. Resolution of such differences should lead to in-depth understanding of nonlinear effects at metal surfaces undergoing nanometer level displacements. Symposium L, Materials Reliability in Microelectronics VI, blended new developments with an historical perspectiv
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