Materials Literature
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Flow-assisted corrosion (FAC) is a significant problem with carbon steel components exposed to rapidly moving water or water/steam mixtures. Such components often develop distinctive patterns of surface damage called scalloping, so to gain further insight into FAC it is of interest to understand the formation and sign…
The doping level of spin-coated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDT:PSS) films was adjusted quantitatively by an electrochemical doping/dedoping process using p -toluenesulfonic acid in acetonitrile as supporting electrolyte. Higher oxidation states relative to as-prepared layers remain stabl…
Surface-enhanced Raman spectrum of anthranil (2,1-benzisoxazole) in activated silver colloid was recorded and compared with the conventional Raman spectrum. The experimentally observed Raman bands along with their corresponding infrared bands were assigned based on the results of density functional theory (DFT) calcul…
Clustered crystals: The authors demonstrate formation of stable zeolite A monolayers on quartz and subsequent “ship-in-a-bottle” synthesis of luminescent silver sulfide clusters. The pictures show the zeolite crystals at various stages of this process.
A novel electron spin-reorientation transition is discovered by $^{13}\mathrm{C}$ NMR in the quasi-two-dimensional organic antiferromagnet $\ensuremath{\kappa}\mathrm{\text{\ensuremath{-}}}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\mathrm{\text{\ensuremath{-}}}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}\mathrm{C}\mathrm{u}[\…
Abstract The synthesis and characterization of a mononuclear iron( III ) complex [Fe(Hphpz)Cl(CH 3 OH)] ( 1 ) and a tetranuclear assembly of a bis(μ‐hydroxo)‐bridged dinuclear iron( III ) complex [{Fe(Hphpz) 2 (OH)} 2 ][Fe(Hphpz) 3 ] 2 ( 2 ) with the ligand 3(5)‐methyl‐5(3)‐(2‐hydroxyphenyl)pyrazole (H 2 phpz) is repo…
Stepwise amination of cyanuric chloride (1) with 5-(4-aminophenyl)-10,15,20-triphenylporphyrin (2) and/or its zinc(II) complex (3) enables the synthesis of porphyrin-porphyrin dyads with predetermined free base-free base forms or free base-zinc and zinc-zinc metalation states. Furthermore, the use of aminopropyl-silan…
A detailed photophysical study of [Eu within (biqO2.2.2)(CF3SO3)](CF3SO3)2. CH3CN.H2O (Eu within 1) and two other types of cryptates incorporating three 3,3'-biisoquinoline-2,2'-dioxide units has been performed. Structural crystallographic data of Eu within 1, electronic structure calculations and theoretical models w…
A series of metallocene-containing silsesquioxanes with alkenylsilyl and trimethylsilyl groups, Cp‘ 2 M[(c-C 5 H 9 ) 7 Si 7 O 11 ](OSiMe 2 R) ( 2b − d, 3b − d, 4d, 5d: Cp‘ = Cp (cyclopentadienyl), Cp* (pentamethylcyclopentadienyl); M = Ti, Zr, Hf, R = methyl, vinyl, allyl), have been synthesized. The structures of the…
Abstract The asymptotic mass‐transfer coefficients are determined in washcoated monoliths of various geometric shapes by solving the convection–diffusion equation in the fluid phase coupled with the diffusion–reaction equation in the washcoat. The dependency of the asymptotic Sherwood number (Sh ∞ ) on washcoat proper…
Watching nanowires grow! Self-organization of CdTe nanocrystals into luminescent nanowires (see picture) takes place in a standard physiological phosphate-buffered solution and is completed in several hours, as demonstrated in situ by means of confocal microscopy. Luminescence and Raman spectroscopy data evidence the…
Highly ordered hexagonal mesoporous silica materials (JLU-20) with uniform pore sizes have been successfully synthesized at high temperature (150-220 degrees C) by using fluorocarbon-hydrocarbon surfactant mixtures. The fluorocarbon-hydrocarbon surfactant mixtures combine the advantages of both stable fluorocarbon sur…
X-ray absorption spectroscopy (EXAFS) was used to characterize zinc-neutralized ionomers made from ethylene−propylene copolymers with grafted maleic anhydride units (Zn-MAn- g -EPM). The structure of the zinc moieties in the dry system consisted of two chelating carboxylate groups around one zinc atom a structure much…
In a recent contribution [Phys. Rev. Lett. 91, 046101 (2003)] we used polarization-dependent, $\mathrm{Ni}$ $K$ edge, x-ray absorption spectroscopy (XAS) to probe the structure of ultrathin $\mathrm{NiO}$ epilayers deposited on $\mathrm{Ag}(001)$. In that experiment samples were measured ex-situ and a $5\phantom{\rule…
Based on scanning tunneling microscopy of the fivefold surface of the icosahedral Al-Cu-Fe quasicrystal and the refined structure model of the isostructural i-Al-Pd-Mn, we present evidence that the surface corresponds to bulk truncations at the positions where blocks of atomic layers are separated by larger interlayer…
The effect of interlayer lattice registry on the formation of fully collapsed single wall carbon nanotubes (SWCNTs) was studied via atomistic simulation. It was found that a fully collapsed SWCNT could adopt various structural morphologies, such as a straight ribbon, a warping ribbon, or even a twisted ribbon. Such st…
A one-step sequential method for preparing AgCl@polypyrrole-chitosan core-shell nanoparticles and subsequently the formation of polypyrrole-chitosan hollow nanospheres is reported. The formation of the core and the shell is performed in one reaction medium almost simultaneously. Transmission electron microscopy (TEM)…
Control of structure and function in membrane proteins remains a formidable challenge. We report here a new design paradigm for the self-assembly of protein components in the context of nonpolar environments of biological membranes. An incrementally staged assembly process relying on the unique properties of fluorinat…
This Letter is concerned with the determination of the transition paths attendant to nanovoid growth in aluminum under hydrostatic tension. The analysis is, therefore, based on energy minimization at 0 K. Aluminum is modeled by the Ercolessi-Adams embedded-atom method, and spurious boundary artifacts are mitigated by…
Electronic standing waves with two different wavelengths were directly mapped near one end of a single-wall carbon nanotube as a function of the tip position and the sample bias voltage with high-resolution position-resolved scanning tunneling spectroscopy. The observed two standing waves caused by separate spin and c…