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Showing 1 to 9 of 9 for “"Nanophase separation"”.
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Understanding and Optimizing Nanophase Separation Sintering
… and reduce the sintering time of the materials. Nanophase separation sintering (NPSS) was first explored by Dr. Mansoo Park. In this process, a mechanically alloyed powder experiences phase separation on the surface. This second phase promotes neck formation and rapid densification. By being a …
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Nanophase separation in monodisperse rodcoil diblock polymers
… thin films we observe that the polymers ""nanophase"" separate into rod and coil-rich domains with dimensions of less than 10 nm, not common in typical coil-coil block copolymers. Highly periodic morphologies of rod and coil domains develop upon annealing and show a dependence on the …
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Nanophase Separation and Photochemical Reaction of Rodcoil Molecules, Reactive Liquid Crystal Molecules, and Binary Mixtures
"This work presents the synthesis and characterization of three related organic systems designed for self-assembly into ordered materials such as two dimensional objects and nanostructures. A family of reactive block molecules referred to as ""rodcoils"" was synthesized for the purpose of forming …
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Multilayered supramolecular structures: Two-dimensional polymers and polar assemblies
… assemblies in solution cast bulk films with nanophase separation of the three chemically distinct segments. These assemblies stack spontaneously on solid substrates over macroscopic distances and form self-assembled surfaces. Moreover, the substrate seems to guide the stacking direction of …
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Design of bulk nanocrystalline tungsten alloys via nano-phase separation sintering
… accelerated sintering method called 'nano-phase separation sintering' is developed, with specific applicability to nanostructured tungsten alloys. Nanocrystalline tungsten alloys containing minority additions of chromium are produced by high-energy ball milling and then consolidated. Such alloys …
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Enhancing materials for fuel cells and organic solar cells through molecular design
… of 104 mS/cm at 80 °C in water. Controlled nanophase separation with increased domain size contributed by the triptycene moiety lead to the high observed conductivities. However, the methylimidazolium functional groups on the membranes are not stable to alkaline conditions in the operation …
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Synthesis and Characterization of Sulfonated Poly (Arylene Ether Sulfone) Copolymers Via Direct Copolymerization: Candidates for Proton Exchange Membrane Fuel Cells
… of the copolymers could be designed to display nanophase separation in the hydrophobic and hydrophilic (sulfonated) regions. Morphology with either co-continuous hydrophobic or hydrophilic domains could be attained for all the sulfonated copolymers. The degree of disulfonation required for …
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Synthesis and Characterization of Multiblock Copolymers for Proton Exchange Membrane Fuel Cells (PEMFC)
Nanophase-separated hydrophilic-hydrophobic multiblock copolymers are promising proton exchange membrane (PEM) materials due to their ability to form various morphological structures which enhance transport. Four arylene chlorides monomers (2,5-Dichlorobenzophenone and its derivatives) were first …
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Synthesis and Characterization of Hydrophilic-Hydrophobic Disulfonated Poly(Arylene Ether Sulfone)-Decafluoro Biphenyl Based Poly(Arylene Ether) Multiblock Copolymers for Proton Exchange Membranes (PEMs)
… solvent cast into tough membranes, which had nanophase separated hydrophilic and hydrophobic regions. The performance and structure-property relationships of these materials were studied and compared to random copolymer systems. NMR results supported that the multiblock sequence had been …