Materials Literature
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Abstract A new synthetic route to 2,2′,3,3′‐BTDA (where BTDA is benzophenonetetracarboxylic dianhydride), an isomer of 2,3′,3′,4′‐BTDA and 3,3′,4,4′‐BTDA, is described. Single‐crystal X‐ray diffraction analysis of 2,2′,3,3′‐BTDA has shown that this dianhydride has a bent and noncoplanar structure. The polymerizations…
Media with negative refractive index (NRI) are expected to exhibit properties that are unusual compared to materials with a positive index of refraction. However, until recently, these properties were not experimentally observed, since no NRI material occurs naturally. Periodic structures with NRI have been constructe…
This study examines the surface-assisted photoalignment effect of dye-doped liquid-crystal films having a homogeneous alignment. Observations made using a polarizing optical microscope, a scanning electronic microscope, and an atomic force microscope confirm that the morphology of laser-induced surface-adsorbed dyes a…
Abstract Seven new manganese( II , III , IV ) pyridinecarboxylate compounds (Et 4 N)[MnCl 2 (pic) 2 ] ( 1 , Hpic = picolinic acid) [MnCl(pic) 2 (H 2 O)]·H 2 O ( 2 ), [MnCl(pic)(H 2 O) 2 ] n ( 3 ), [Mn(pic) 2 ] n ( 4 ), [MnCl(pic)] n ( 5 ), [MnCl 2 (4‐C 5 H 4 NHCOO)] n ( 6 ) and [Mn 2 O 2 (pic) 4 ] ( 7 ) were synthesiz…
By developing a chalcogenide memory element that can be operated at low writing current, we have demonstrated the possibility of high-density phase-change random access memory. We have investigated the phase transition behaviors as a function of various process factors including contact size, cell size and thickness,…
In this paper, the influence of floating dummy metal-fills on interconnect parasitic is analyzed with the variations of possible factors which can affect the capacitance. Recently proposed chip-level metal-fill modeling, replacing metal-fill layer with effective high-k dielectric, has been reviewed in detail. Using a…
High performance p- and n-type single-walled carbon nanotube (SWNT) field-effect transistors (FETs) are obtained by using high and low work function metals, Pd and Al as source/drain (S/D) electrodes respectively. Ohmic contacts made to chemically intrinsic SWNTs, with no or small Schottky barriers (SB), afford high O…
Abstract Luminescence, energy transfer and defects creation processes were studied at 4.2–300 K for Ce 3+ ‐doped Lu 3 Al 5 O 12 crystals under excitation in the 2.5–11.5 eV energy range. The results obtained were compared with the characteristics of Y 3 Al 5 O 12 :Ce crystals. It was concluded that in both systems the…
It has been recently proved that a slab of negative refractive index material acts as a perfect lens in that it makes accessible the subwavelength image information contained in the evanescent modes of a source. Here we elaborate on perfect lens solutions to spherical shells of negative refractive material where magni…
Delivery of drugs to the brain is still a major challenge. Successful delivery across the bloodbrain barrier has only been achieved in some cases, e.g., using pro-drugs. The review describes the delivery to the brain using nanoparticulate drug carriers in combination with the novel targeting principle of "differential…
We report on variable-angle deuterium NMR measurements of nematic liquid-crystalline side-chain polymers, where we have found proof of the existence of a biaxial nematic phase in a system with a side-on attachment of the mesogenic group to the polymer backbone. This provides efficient coupling to the polymer backbone…
We present studies of the potential energy landscape of selected binary Lennard-Jones thirteen atom clusters. The effect of adding selected impurity atoms to a homogeneous cluster is explored. We analyze the energy landscapes of the studied systems using disconnectivity graphs. The required inherent structures and tra…
Recent studies demonstrate that an individual magnetic domain wall (DW) can be trapped and reproducibly positioned within multiterminal (Ga,Mn)As microdevices. The electrical resistance obtained from such measurements is found to be measurably altered by the presence of this single entity. To elucidate these observati…
A new DTA (Differential Thermal Analysis) device was designed and installed in a Hot Isostatic Pressure (HIP) furnace in order to perform high-pressure thermodynamic investigations up to 2 kbar and 1200C. Thermal analysis can be carried out in inert or oxidising atmosphere up to p(O2) = 400 bar. The calibration of the…
Detailed studies of the thermodynamic properties of selected binary Lennard-Jones clusters of the type X_{13-n}Y_n (where n=1,2,3) are presented. The total energy, heat capacity and first derivative of the heat capacity as a function of temperature are calculated by using the classical and path integral Monte Carlo me…
A systematic study of NaxCoO2 (x=0.50 - 0.90) and NaxCoO2 yH(D)2O (x=0.26 - 0.42, y=1.3) has been performed to determine phase stability and the effect of hydration on the structural and superconducting properties of this system. We show that a careful control of the Na deintercalation process and hydration dynamics i…
We study the cooperative rupture of multiple adhesion bonds under shared linear loading. Simulations of the appropriate Master equation are compared with numerical integration of a rate equation for the mean number of bonds and its scaling analysis. In general, force-accelerated rupture is rather abrupt. For small clu…
This paper extends the stability calculations carried out for a spherical particle [Eur. Phys. J. B, vol. 37 (2004) or arXiv: cond-mat/0401404] to the case of a cylindrical inclusion.
Abstract The derivation of a new condition for characterizing isotropic dielectric‐magnetic materials exhibiting negative phase velocity, and the equivalence of that condition with previously derived conditions, are presented. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 315–316, 2004; Published onlin…
The scaling capability of chalcogenide-based phase-change memory (PCM) is discussed. Experimental and numerical results are presented, showing that the reset current scales down with the device contact area, reaching values as low as 50 /spl mu/A. The impact of thermal cross-talk between adjacent bits is investigated,…