Materials Literature
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Monolayer-protected nanoclusters exhibit good stabilityboth in solution and dry forms and as such are promising materials for nanocircuits and nanodevices. In this article, an efficient method for fabricating 2D crosslinked nanoparticle networks using the Langmuir–Blodgett technique and dithiols as bifunctional linker…
Alternating oligomers and polymers consisting of 2,2′-bipyridine and diethinylenebenzene units and corresponding model compounds were synthesized and investigated in dilute solutions by absorption spectroscopy and by stationary and time-resolved emission spectroscopy. The strictly linear (rod-like) π-chain oligomers/p…
In this paper, Fourier transform infrared (FT-IR) spectroscopy is used to study the thermal properties of methyl silsesquioxane (MSQ), an important low-dielectric-constant organic spin-on glass for semiconductor device fabrication. The compositional and structural changes of MSQ with temperature are investigated in de…
A novel bis(ether anhydride) monomer, 1,4-bis(3,4-dicarboxyphenoxy)-2-tert-butylbenzene dianhydride, was synthesized from the nitro displacement of 4-nitrophthalodinitrile by the phenoxide ion of tert-butylhydroquinone, followed by alkaline hydrolysis of the intermediate bis(ether dinitrile) and dehydration of the res…
Electron paramagnetic resonance (EPR) measurements have been made of amorphous hydrogenated carbon (a-C:H) films grown by plasma enhanced chemical vapor deposition (PECVD) with negative self-bias voltages ${V}_{b}$ in the approximate range 10--540 V. For ${V}_{b}<100\mathrm{V},$ as the film changes from polymerlike…
We have developed a new error correction method (Picket: a combination of a long distance code (LDC) and a burst indicator subcode (BIS)), a new channel modulation scheme (17PP, or (1, 7) RLL parity preserve (PP)-prohibit repeated minimum transition runlength (RMTR) in full), and a new address format (zoned constant a…
A new methodology based on a novel combination of a high-resolution specular x-ray reflectivity and small-angle neutron scattering has been developed to evaluate the structural properties of low-dielectric-constant porous silica thin films about one micrometer thick supported on silicon wafer substrates. To complement…
Through hardening bearing steels with low alloy content are sometimes surface hardened by induction hardening to implement compressive residual stresses into the surface. This method is not regularly applied for steels with high alloy content especially not for applications in the aerospace and space industry. Here ca…
An analytical method for the determination of uranium enrichment in uranium oxide without using any calibration standards is described. Very good agreement between the measured and certified values was obtained in the analysis of a Standard Reference Material. Precise energies and emission probabilities were derived f…
A seminal model describing the kinetics of growth of thin oxide films on metal crystals was proposed by Cabrera and Mott (CM). The model is based on the assumption that the growth is limited by the field-facilitated activated jumps of metal ions located in steps on the metal–oxide interface. We generalize the CM model…
A Ce‐TZP/platelike La(Co(Fe 0.9 Al 0.1 ) 11 )O 19 composite was synthesized in situ while sintering from a mixture of Ce‐TZP, La(Fe 0.9 Al 0.1 )O 3 , Fe 2 O 3 , Al 2 O 3 , and CoO powders. Platelike La(Co(Fe 0.9 Al 0.1 ) 11 )O 19 crystals were grown in a dense Ce‐TZP matrix after sintering at temperatures of 1200°–135…
Dipping and photo-induced liquid crystal (LC) alignments were demonstrated using new silanes as surface coupling agents. In the dipping method, both homogeneous and homeotropic alignments can be achieved depending on the alkyl chain length of the silane employed. The 110°C post curing temperature makes the dipping met…
A mechanism of room-temperature irradiation-induced strengthening of alkali-halide crystals (AHCs) is suggested. It is shown that the deformation-stimulated luminescence is a result of the destruction of hole color centers, which strengthen AHCs, by dislocations.
In order to raise yam quality, a new drafting system concept for ring spinning machines is developed in this study, along with an analysis of its controlling effects. To optimize the new drafting system, its structural parameters are studied and two empirical equations for yarn unevenness and nep count model its desig…
We have investigated the phenomenon of field-induced smectic layer instability, as monitored by synchrotron x-ray scattering. This instability means that, upon application of time-asymmetric electric fields to chiral smectics, the layer direction seems to "rotate" locally around an axis given by the direction of the a…
Some aspects of electrochromism phenomena are presented in this review paper.A deep literature revision about the subject dealing with materials and device configurations developed in the last years, is presented.Great efforts of the scientific community have been done in this field.On the other hand, new electrochomi…
Austempered ductile iron (ADI) is gradually replacing many fabricated and forged steel components in engineering applications. One of its advantages is the combination of good castability, machinability, and mechanical properties with significant savings in cost and weight compared with equivalent steel components. A…
Branched poly(ethylene terephthalate)s (BPET) of varying molar mass have been synthesized with glycerol and pentaerythritol as branching comonomers, and their rheological behaviour has been measured. In this study, we describe the use of dynamic and steady shear measurements to examine the influence of the proportion…
Three protected catechol-containing conjugated oligomers have been prepared using Pd-mediated coupling reactions. Two of the oligomers are poly[ o -phenylenevinylene] type while the other is poly[ o -phenyleneethynylene] type. One of the poly[ o -phenylenevinylene]-type oligomers is regioregular while the other is reg…
A silica (SiO 2 ) layer was deposited on the surface of an AlN ceramic in order to increase the strength and to prevent the high‐temperature oxidation of the material. The layer was formed on the surface by exposing coupons to the atmosphere downstream of a bed of SiC powder in a flowing H 2 –0.1% H 2 O atmosphere at…