Materials Literature
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We present the frequency dependence of microwave magnetoabsorption in glass-coated amorphous microwires of (Co100−xFex)72.5Si12.5B15. The data were taken at room temperature in the frequency range of 1–60 GHz for fields up to 15 kOe by either a cavity perturbation technique or a coaxial transmission line. The resultin…
High‐pressure Raman and X‐ray diffraction data on single crystals of hydrous layer‐structure minerals, dickite and gibbsite, reveal structural phase transitions occurring between 2.0 and 2.5 GPa. In the case of dickite, this is the first documented occurrence of a pressure‐induced phase transformation in a 1:1 phyllos…
Methanopterin is a folate analog involved in the C1 metabolism of methanogenic archaea, sulfate-reducing archaea, and methylotrophic bacteria. Although a pathway for methanopterin biosynthesis has been described in methanogens, little is known about the enzymes and genes involved in the biosynthetic pathway. The enzym…
Aluminum borate microtubes were prepared in excellent yield by annealing the Al(2)O(3)-NaBH(4)-NiCl(2) starting materials at 1050 degrees C under N(2)(H(2)) atmosphere. The tubes are usually open at each end with the outer diameters narrowly distributed at ca. 1 microm. XRD results and TEM analysis identified the comp…
A spin-on process was employed in the fabrication of titania nanowires. When a groove patterned azobenzene functionalized polymer (AFP) was used as a template, titania nanowires could be fabricated along the grooves via gel cracking, especially when the concentration of sol precursor was low. However, when the sol pre…
The isovalent substitution of Ca2+ for Sr2+ substitution in the recently discovered misfit cobaltite [Pb0.7Co0.3Sr2O3] [CoO2]1.79 has been investigated for its very attractive thermopower properties. Starting from the pure Sr cobaltite with a thermopower S value at 300 K in the range from 100 to 130 μV K−1, it is foun…
An in situ electromigration apparatus was used to study the kinetics of void growth in unpassivated, electropolated copper damascene lines. Voids were observed to grow by consuming grains in a stepwise fashion, either by grain thinning or by an edge displacement mechanism. Surface diffusion was found to be the primary…
The refractive indices of eleven kinds of polyimide (PI) films formed on silicon substrates have been measured at three wavelengths (0.633, 1.320, and 1.523 µm) in the transverse electric (TE) and transverse magnetic (TM) polarization modes using the prism-coupling method. The wavelength dependence of average refracti…
The piezoelectric properties of Pb(Zr,Ti)O3–Pb(Sb,Mn)O3 modified with the rare earth (RE) metal species Ce (1.03 Å), Eu (0.95 Å) and Yb (0.85 Å) have been investigated. For all rare earth substituents investigated in this system, regardless of the species ionic radii, the piezoelectric properties were observed to have…
Density functional theory (DFT) calculations were performed on oligomers of 3,4-(ethylenedioxy)thiophene (EDOT), 4-(dicyanomethylene)-4 H -cyclopenta[2,1- b:3,4- b ‘]dithiophene (CDM), and co-oligomers (CDM/EDOT). Oligomer data were extrapolated to polymer values. Theoretical band gaps reproduce λ max from UV spectros…
The phase behavior of apoferritin solutions induced by the addition of polyethylene glycol (PEG) was studied. The interaction between apoferritin molecules was determined by dynamic light scattering. The comparison of the experiments with the theoretical calculations showed that the addition of NaCl to the protein sol…
The magnetic clusters are usually described by an effective Hamiltonian acting in a fixed S space. This single-spin description neglects the mixing between states with different total spin S produced by anisotropic interactions, such as the local crystal field and the magnetic dipole-dipole coupling. We have developed…
Temperature and pressure dependent measurements have been performed on 3.5 nm ZnS:Mn2+ nanoparticles. As temperature increases, the donor–acceptor (DA) emission of ZnS:Mn2+ nanoparticles at 440 nm shifts to longer wavelengths while the Mn2+ emission (4T1–6A1) shifts to shorter wavelengths. Both the DA and Mn2+ emissio…
We proposed a new flexible ferroelectric liquid crystal (FLC) device containing polymer walls and networks between plastic film substrates. The solution of FLC and monomer sandwiched between the substrates was irradiated with ultraviolet (UV) light through a photomask to form the polymer walls. Polymer walls without o…
The first topochemical 1,6-polymerization of a triene has been observed. The required supramolecular structure for this polymerization was achieved by the pi-pi stacking of the isonicotinate functionality. The crystal environment of this polymerization reaction controlled both the molecular and supramolecular structur…
We present a theoretical investigation of electron-hole and exciton energy spectra as well as oscillator strengths of optical transitions in colloidal CdS quantum dots (QD's) with spherical and tetrahedral shape. The Coulomb potential energy of the electron-hole system is treated taking into account the dielectric mis…
Abstract Unoriented (UPP) and biaxially oriented (BOPP) polypropylene films were treated under radio frequency plasma of air, nitrogen, oxygen, and ammonia. Surface modification of polypropylene films was investigated by using surface energy measurement and attenuated total reflection (ATR)‐FTIR spectroscopy. Surface…
This work presents a novel and simple aqueous sol−gel route for the encapsulation of biomolecules, which are labile to the alcohol that results as a byproduct of the matrix formation. The controlled vacuum evaporation of the alcohol by rotavapor methods provides an aqueous sol in which the activity of labile biomolecu…
Single-wall carbon nanotubes (SWCNTs) and well-aligned thin multiwall carbon nanotubes (MWCNTs) were successfully synthesized via pyrolysis of a powder mixture of ferrocene and anthracene or 9,10-dibromoanthracene. It is shown that the size of the MWCNTs can be tuned just by changing the ratio of ferrocene/anthracene…
Microstructural changes of amorphous V2O5 films with lithium intercalation are studied using Raman-scattering measurements. The Raman spectra of as-deposited films show two broad peaks around at 520 and 650 cm−1, due to the stretching modes of the V3–O and V2–O bonds, respectively, and a relatively sharp peak at 1027…