As IC performance increases, many technical challenges appear in the areas of current-carrying capacities, thermal management, I/O density, and thermal-mechanical reliability. To address these problems, the use of ali...
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As IC performance increases, many technical challenges appear in the areas of current-carrying capacities, thermal management, I/O density, and thermal-mechanical reliability. To address these problems, the use of aligned carbon nanotubes (CNTs) has been proposed in IC packaging for electrical interconnect and thermal interface materials (TIMs). The theoretically superior electrical, thermal, and mechanical properties of CNTs promise to reduce the interconnect pitch size, increase thermal conductivity, and enhance system reliability, which is expected to bring about revolutionary improvement to microelectronics. However, the problems with the CVD growth process such as high growth temperature and poor adhesion of CNTs to substrates, challenges in selectively patterning CNT structures, high contact resistance of CNT/electrodes and damage of CNT wall structure by wet chemical functionalization, become barriers for CNT applications. In order to overcome these disadvantages, we proposed the "chemical anchoring" process to directly attach aligned CNTs onto gold-coated substrates. This methodology has the following features: 1) in-situ functionalization of CNTs with reactive functional groups during CVD process, which preserves the perfect CNT wall structure and good alignment of CNTs as well as conrrollably tunes the length of functionalized CNTs; 2) covalently bonded interface by employing a self-assembled monolayer (SAM) as the bridging ligand at the CNT-gold substrate interface; 3) low temperature and simple process. Scanning electron microscopy (SEM) was used to characterize the CNT structures and the SAM-treated gold surface. The effectiveness of the in-situ functionalization was studied by XPS (X-ray photoelectron spectroscopy) and FTIR (Fourier transform infrared spectroscopy). Four-point probe testing system was employed to test the electrical performance of the chemically anchored CNT structure. Results showed an Ohmic contact, low electrical resistivity of the
Protein membranes have been prepared by mixing gelatin (G) with Bombyx mori silk fibroin (SF) and using aqueous methanol (MeOH) to induce SF crystallization. Amorphous blends of these polymers appear quasi-homogeneous...
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A novel superabsorbent, clay/polyacrylamide nanocomposite hydrogels(S-M gel), has been successfully prepared. It was found that the properties of S-M gel can be modulated by post treatment;the swelling ratio of S-M ge...
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ISBN:
(纸本)9787122012234
A novel superabsorbent, clay/polyacrylamide nanocomposite hydrogels(S-M gel), has been successfully prepared. It was found that the properties of S-M gel can be modulated by post treatment;the swelling ratio of S-M gels increases greatly by heat post treatment, much more than any other reported NC gels. Experimental results indicate that the improvements in swelling ratio are due to the physical structure changes of S-M gels. This finding will help to further investigate the structure of NC gels, and present a new approach to control the properties and structure of NC gels.
Vladimir Tsukruk and co‐workers demonstrate on p. 4248 the application of plasma‐polymerized organic/silicon bimaterial structures as highly sensitive and agile chemical sensors. Owing to their unique nanoscale topo...
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Vladimir Tsukruk and co‐workers demonstrate on p. 4248 the application of plasma‐polymerized organic/silicon bimaterial structures as highly sensitive and agile chemical sensors. Owing to their unique nanoscale topology, highly crosslinked structure, and precise choice of the precursors, polymer films coated on microcantilevers exhibited record sensitivity to water vapor and other volatile organic compounds in conjunction with fast response times. The inside cover image by Brian Schrank shows the bimaterial structure deflection in the presence of a stimuli vapor.
Summary: A series of high clay content Clay-S/PNIPAAm nanocomposite hydrogels (S-N gels) has been successfully prepared by in situ polymerization. Their mechanical properties and phase transition behavior has been sys...
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Summary: A series of high clay content Clay-S/PNIPAAm nanocomposite hydrogels (S-N gels) has been successfully prepared by in situ polymerization. Their mechanical properties and phase transition behavior has been systematically investigated. It was found that S-N gels show high tensile strength, high elongation at break, fast stress relaxation, high hysteresis, and poor resilience, which may be ascribed to the hydrophilicity and flexibility of PNIPAAm chains. It was also concluded that the macroscopic phase transition behavior of S-N gels depend on the ratio of Segments II (thermosensitive segments) to Segments I (non-thermosensitive segments).
Surface‐biofunctionalized synthetic polymerfibers composed of a fiber‐forming host polymer and an oligopeptide conjugate can be prepared from electrospinning, report Spontak and co‐workers on p. 87. The conjugate ...
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Surface‐biofunctionalized synthetic polymerfibers composed of a fiber‐forming host polymer and an oligopeptide conjugate can be prepared from electrospinning, report Spontak and co‐workers on p. 87. The conjugate consists of a polypeptide segment and a polymer block that is compatible with the host polymer. Because the more polarizable peptide segment migrates to the surface during electrospinning, peptide surface‐enrichment is achieved in a single step without further treatment.
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