摘要:
A method of manufacturing a heat transfer device including providing first and second thermally conductive substrates that are substantially atomically flat, providing a patterned electrical barrier on the first or second thermally conductive substrates and disposing a low work function material on the first or second thermally conductive substrates in an area oriented between the patterned electrical barrier in a configuration in which the first and second thermally conductive substrates are positioned opposite from one another. The method also includes bonding the first and second thermally conductive substrates in the configuration and extracting a plurality of units having opposite sections of the first and second thermally conductive substrates, each unit having a portion of the patterned electrical barrier disposed about the low work function material.
摘要:
A method of making nanoscale ordered composites of covalent ceramics through block copolymer-assisted assembly. At least one polymeric precursor is mixed with a block copolymer, and self-assembly of the mixture proceeds through an annealing process. During the annealing step, the polymeric precursor cross-links to form a structure robust enough to survive both the order-disorder transition temperature the block copolymer and the pyrolysis process, yielding ordered nanocomposites of high temperature ceramic materials. The method yields a variety of structures and morphologies. A ceramic material having at least one ceramic phase that has an ordered structure on a nanoscale and thermally stable up to a temperature of at least about 800° C. is also disclosed. The ceramic material is suitable for use in hot gas path assemblies, such as turbine assemblies, boilers, combustors, and the like.
摘要:
In some embodiments, the present invention is directed to methods of making structures with complex functional architectures, where such structures generally comprise at least two mesoporous regions comprising different chemical activity, and where such methods afford spatial control over the placement of such regions of differing chemical activity. In some embodiments, the present invention is also directed to the structures formed by such methods, where such structures are themselves novel.
摘要:
A porous structure and method of making the porous structure is disclosed. The porous structure includes a substrate comprising at least one pore having an internal surface. At least a first portion of the internal surface of the at least one pore has a first fluid contact angle and at least second portion of the internal surface of the at least one pore has a second fluid contact angle. The difference between the first fluid contact angle and the second fluid contact angle has an absolute value of at least about 5 degrees and the second fluid contact angle is greater than about 40 degrees.
摘要:
Multiphase ceramic nanocomposites having at least three phases are disclosed. Each of the at least three phases has an average grain size less than about 100 nm. In one embodiment, the ceramic nanocomposite is substantially free of glassy grain boundary phases. In another embodiment, the multiphase ceramic nanocomposite is thermally stable up to a temperature of at least about 1500° C. Methods of making such multiphase ceramic nanocomposites are also disclosed.
摘要:
Disclosed herein is a multifunctional catalyst system comprising a substrate; and a catalyst pair disposed upon the substrate; wherein the catalyst pair comprises a first catalyst and a second catalyst; and wherein an average particle or domain spacing between particles or domains comprising the first catalyst or the second catalyst is about 10 to about 1,000 nanometers. Disclosed herein too is a process comprising selectively functionalizing a substrate to form a functionalized substrate; reacting a first catalyst to a first region of the functionalized substrate; and reacting a second catalyst to a second region of the functionalized substrate; wherein an average particle or domain spacing between particles or domains comprising the first catalyst or the second catalyst is about 10 to about 1,000 nanometers.
摘要:
A membrane structure is provided. The membrane structure includes a first layer having a plurality of interconnected pores; and a second layer disposed on the first layer. The second layer has a plurality of unconnected pores. Each of the unconnected pores is in fluid communication with at least one of the interconnected pores of the first layer. A method of making a membrane structure is provided. The method includes the steps of providing a first layer having a plurality of interconnected pores; and disposing a second layer on the first layer. Disposing a second layer includes depositing a conducting layer on the first layer; and anodizing the conducting layer to convert the conducting layer into a porous layer.
摘要:
A ceramic structure having a scaffold with at least one opening and at least one porous filler material at least partially filling the at least one opening is described. The porous ceramic filler includes a plurality of pores. The pores have an average size in a range from about 2 nm to about 100 nm. The plurality of pores includes at least one pore architecture. For each pore architecture, the average pore size does not vary by more than about 100% when the average pore size is in a range from about 2 nm to about 50 nm, and the average pore size does not vary by more than about 50% when the average pore size is greater than about 50 nm. The plurality of pores includes at least two pore architectures when the porous filler material is silica. Also described is a method of making the ceramic structure.