Materials Literature
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Using time-domain thermoreflectance, we have measured the transport of thermally excited vibrational energy across planar interfaces between water and solids that have been chemically functionalized with a self-assembled monolayer (SAM). The Kapitza length--i.e., the thermal conductivity of water divided by the therma…
Magnetic tunnel junctions (MTJs) with a stacking structure of Co2MnSi∕Al–O∕Co2MnSi were fabricated using magnetron sputtering system. Fabricated MTJ exhibited an extremely large tunneling magnetoresistance (TMR) ratio of 570% at low temperature, which is the highest TMR ratio reported to date for an amorphous Al–O tun…
We have studied the synthesis of magnetite (Fe3O4) nanoparticles functionalized with crosslinked dextran for the application of magnetic fluid hyperthermia. The CaCo-2 cell model was employed as the biological system. X-Ray diffraction was used to characterize the structure of the synthesized nanoparticles, showing a…
The therapeutic activity of most cancer drugs is dose dependant. Systemic toxicity prevents the use of aggressive high dose chemotherapy. There is a great need for more efficient localized and nonsystemic drug delivery. Reported here is research devoted to the synthesis, properties, and therapeutic evaluation of drug…
It has been recently observed for palladium and gold nanoparticles, that the magnetic moment at constant applied field does not change with temperature over the range comprised between 5 and 300 K. These samples with size smaller than 2.5 nm exhibit remanence up to room temperature. The permanent magnetism for so smal…
For the model electronic spectrum in the tight-binding approximation it is shown that the finite homogeneous deformation essentially increases the quantity of pairs of electronic states which are active in generation of atoms displacement waves. This conclusion gives additional possibilities for the explanation of fea…
The influence of microemulsions on the vitamin B12-catalyzed enantioselective isomerization of 1,2-epoxycyclopentane (1) to form (R)-cyclopent-2-enol (2) has been examined. The reaction was initiated by a reduction of vitamin B12 to the Co(I) form by Zn/NH4Cl. The largest enantiomeric excess (e.e.) in the products was…
Two different kinds of organic polyelectrolyte (PE)/inorganic silicate nanolaminates carrying dissimilar interfacial adhesion between the organic and the inorganic layers were prepared using the layer-by-layer self-assembly. To investigate the mechanical behavior of the prepared hybrid films, apparent modulus (E′), ha…
This work reports on a system that can determine the thermal behavior of an activated complex microelectronic device by measuring its surface temperature field with a thermoreflectance-based system. The article describes the features of the experimental setup, provides details of the calibration process used to map th…
The use of low melting alloy thermal interface materials results in exceptionally low thermal resistance between heat-generating electronic components and heat removal systems. Under certain conditions, these alloys can oxidize which may lead to degradation in thermal performance. In addition, if the alloy is used in…
Biodegradable amphiphilic graft copolymers poly-alpha,beta-[N-(2-hydroxyethyl)-L-aspartamide]-g-poly(epsilon-caprolactone) (PHEA-g-PCL) with different branch lengths were synthesized through the ring-opening polymerization of epsilon-caprolactone initiated by the macroinitiator PHEA bearing hydroxyl groups. With use o…
We have studied the relationship between rheological and peeling properties for hot-melt pressure-sensitive adhesives based on homopolymers or copolymers blended with tackifying resins. In this article, we particularly try to demonstrate that it is possible to define a quantitative link between rheology and adherence…
The Boeing sol-gel conversion coating (Boegel-EPII), derived from an acid-catalyzed aqueous solution of organofunctional silane and zirconium alkoxide precursors, is being used as an adhesion promoter for adhesive bonding and painting applications in the aerospace industry. A unique advantage of the sol-gel process is…
The ASTM D 54701 standard is currently being revised to cover a test method for the measurement of thermal impedance and calculation of an apparent thermal conductivity for thermal interface materials (TIM) ranging from liquid compounds to hard solids. Modifications to the procedure include the use of mechanical stops…
The synthesis of novel meso-/macroporous SiO2 monoliths by combining a nano-building-blocks-based approach with the confined geometry of a tailored air-liquid foam structure is described. The resulting macrostructure in which ordered close-packed colloidal silica nanoparticles constitute the monolith's scaffolds very…
Sisal-fiber-reinforced composites, as a class of eco-composites, have attracted much attention from materials scientists and engineers in recent years. In this article, the effects of fiber surface treatment on fiber tensile strength and fiber-matrix interface characteristics were determined by using tensile and singl…
Peptide dendrimers built by iteration of the diamino acid dendron Dap-His-Ser (His = histidine, Ser = Serine, Dap = diamino propionic acid) display a strong positive dendritic effect for the catalytic hydrolysis of 8-acyloxypyrene 1,3,6-trisulfonates, which proceeds with enzyme-like kinetics in aqueous medium (Delort,…
Localized areas of high heat flux on microprocessors produce hot spots that limit their reliability and performance. With increasingly dense circuits and the integration of high power processors with low power memory, non-uniform thermal profiles will become more dramatic and difficult to manage. Chip scale thermal so…
Highly ordered silver sulfide nanorods conjugated with the Bovine Serum Albumin (BSA) protein have been successfully achieved at ambient temperature. Such a process is very simple and controllable, directly using silver nitrate and thioacetamide (TAA) as the reactants in the aqueous solution of BSA. The products have…
Poly(propylene fumarate) (PPF) is an important biodegradable and cross-linkable polymer designed for bone-tissue-engineering applications. For the first time we report the extensive characterization of this biomaterial including molecular weight dependences of physical properties such as glass transition temperature T…