Materials Literature
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We report that various geometric patterns can be formed upon mechanical deformation of hexagonal micro polymer mesh. The patterning of micromesh can be applied to the fabrication of micropatterned soft-materials for cell culturing. A microporous film was prepared from a viscoelastic polymer, poly(ε-caprolactone). The…
Abstract A highly efficient method for the synthesis of chloro‐substituted subphthalocyanines employing a 1 M boron trichloride solution in p ‐xylene is described and compared to other previously described results. The substitution reaction of the axial chlorine atom by a phenoxy group has been optimized. (© Wiley‐VCH…
ABA triblock copolymers [A = 2-(diisopropylamino)ethyl methacrylate), DPA or 2-(diethylamino)ethyl methacrylate), DEA; B = 2-methacryloyloxyethyl phosphorylcholine, MPC] prepared using atom transfer radical polymerization dissolve in acidic solution but form biocompatible free-standing gels at around neutral pH in mod…
Divanadium pentoxide (γ-V 2 O 5 ) nanorods and nanowires have been synthesized by a reverse micelle technique. The length can be tuned easily by keeping the particles in micellar solution after the synthesis from 40 nm to 1 μm. The local structure of these nanocrystals has been studied with high-resolution transmissio…
A novel nonvolatile memory Colossal Magnetoresistive (CMR) thin film resistor for Resistance RAM (RRAM) application has been characterized. A 1RIT RRAM test circuit based on 0.5 /spl mu/m CMOS has been fabricated. RRAM is a low power high-speed memory technology. The memory cell programming pulse is less than 5 V and…
In this paper the interaction of attosecond laser pulses with matter is investigated. The scattering and potential motion of heat carriers as well as the external force are considered. Depending on the ratio of the scatterings and potential motion the heat transport is described by the thermal forced Klein-Gordon or t…
It has long been established that by filling carbon nanotubes or coating on their surfaces with tran-sition metals, one-dimensional hybrid nanostructures can be synthesized. We found through ab initio calculations that such transition-metal/nanotube hybrid structures exhibit substantial magnetism. In particular, cobal…
Raman spectroscopy performed between 565 and 627 nm and also between 458- and 514.5-nm laser excitation was used to map the lowest-energy van Hove singularities of metallic single-walled carbon nanotubes suspended in aqueous solution using sodium dodecyl sulfate. The interband transitions of distinct metallic nanotube…
We study the temperature dependence of the luminescence decay of single CdSe/ZnS quantum dots between 2 and 140 K. For the first time, we observe a biexponential decay which was completely hidden in ensemble measurements. We find that the long time component strongly depends on temperature. This demonstrates that the…
Considerable improvement in the dispersion of purified single-walled carbon nanotubes (SWNTs) in an epoxy composite was obtained through functionalization of the SWNTs by using an optimized H 2 SO 4 /70% HNO 3 acid treatment and subsequent fluorination. Epoxy composites containing 1 wt % nanotubes were processed by di…
Abstract There is probably no other material more closely related to aerospace than titanium and its alloys. With a density of 4.5g/cm 3 , titanium alloys are only about half as heavy as steel or Ni‐based superalloys, yielding an excellent strength‐to‐weight ratio. Furthermore, they have exceptional corrosion resistan…
An improved calculation of ferrite core loss for nonsinusoidal waveforms separates a flux trajectory into major and minor loops via a new recursive algorithm. It is highly accurate and outperforms two previous methods for our measured data. The only characteristics of the material required are the standard Steinmetz-e…
The chalcogenide GeSbTe semiconductor compounds are widely used in rewritable optical disk systems such as CD-RW, PD and DVD-RAM. The readout and write/erase properties are strongly dependent on the optical constants (refractive index n and extinction coefficient k, absorption coefficient a) of the phase-change layer.…
SiC (silicon carbide) has been considered as one of the primary candidate materials for a first wall component in a future fusion reactor because it has been claimed that SiC has excellent high temperature properties and low activation. However, the behavior of tritium on SiC has not been discussed yet. In this study,…
The results show that the degree of water treeing in HV XLPE cables (36 kV and above) is strongly dependent upon the cable design and the service (system) voltage. The water trees are typically relatively short, but their density is similar to that observed in medium voltage cables with similar design. The results fro…
Partial discharge (PD) online monitoring of MV switchgear was implemented in several large industrial plants beginning in 1998. A switchgear manufacturer completed offline testing and calibration to determine the type and location of sensors for measuring the effective sensitivity of partial discharge activity. This p…
Resist stripping and cleaning is evaluated on a RF asher. A combination of RF and MW power can be used to enhance the stripping efficiency in the asher. The RIE components of a plasma are capable of producing plasma damage (can be observed in structures such as thin gate oxide underneath poly lines). In this evaluatio…
There are two methods available for the online monitoring of mica-based insulation associated with high-voltage machines. Partial discharge analysis, PDA, is a time domain technique that measures and classifies electrical impulses that often occur at stator defects. Electromagnetic interference analysis, EMI, is a fre…
We have previously developed a label-free optical method to study biomolecular interactions in real time at the surface of an optically transparent substrate. The method relies on the change in the absorbance spectrum of a self-assembled monolayer of gold nanoparticles on glass as a function of biomolecular binding at…
The experimental data for surface flashover in polymethyl methacrylate (PMMA) at oil/vacuum interface by ramp input pulses are presented. The spacer is a conical frustum varying in length from 1 mm to 3 mm and in angle from 70/spl deg/ to 70/spl deg/. With the slope dV/dt of the input pulse, flashover field varies fro…