Materials Literature
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This article discusses the relationship between the molecular structure of bolaamphiphiles bearing mesogenic groups and their interfacial self-organized morphology. On the basis of the molecular structures of bolaamphiphiles, we designed and synthesized a series of molecules with different hydrophobic alkyl chain leng…
Grazing-incidence X-ray scattering (GIXS) formulas for hexagonally perforated layer (HPL) structures with ABC and AB stacking sequences were derived, and used in the quantitative analysis of the two-dimensional GIXS patterns of polystyrene- b -polyisoprene (PS- b -PI) diblock copolymer thin films supported on silicon…
Organometallic compounds such as phthalocyanine are useful precursors for carbon nanotube formation by pyrolysis because they can supply both carbon and metal catalysts needed for synthesis. Prior milling of iron-phthalocyanine (FePc, FeC 32 H 16 N 8 ) is investigated and shown to affect the sublimation temperature of…
Abstract A new hetero-metal 2-dimensional (2D) spin-crossover complex, {[FeII(3-Fpy)2][AuI(CN)2]2}n (3-Fpy = 3-fluoropyridine) has been synthesized and characterized crystallographically and magnetically. The complex consists of an octahedral FeII ion and a mononuclear [AuI(CN)2]− unit with a linear coordination geome…
Multifunctional conjugated polymers bearing fluorescent, liquid crystalline, and photoresponsive functions were synthesized by introducing the dithienylethene moieties into side chains of poly( p -phenylene−vinylene) [ P1 ] and poly(bithienylene−phenylene) [ P2 ]. Observation of polarizing optical microscope showed th…
New insights into the bone collagen fibril superstructure have been obtained by novel small-angle X-ray scattering analysis. The analysis was carried out on the small-angle equidistant meridional reflections resulting from the periodic structure of collagen fibrils in their axial direction. Conventional two-dimensiona…
The mechanism for synchronous photoluminescence intensity fluctuations, blinking, spanning entire micrometer-long CdSe quantum wires (Glennon, J. J.; Tang, R.; Buhro, W. E.; Loomis, R. A. Nano Lett. 2007, 7, 3290) is likely different than that commonly cited for semiconductor quantum dots. We present a simple model fo…
Keggin-type heteropolyanions, H(3)PW(12)O(40) (HPW), Na(3)PW(12)O(40) (NaPW), H(4)SiW(12)O(40) (HSiW) and K(4)SiW(12)O(40) (KSiW), were encapsulated by a cationic surfactant, di[12-(4'-octyloxy-4-azophenyl)dodecyloxy]dimethylam monium bromide (L), through the replacement of counterions. The resulting surfactant-encaps…
Recently, Heller et al. reported length-dependent effects on the relative photoluminescence (PL) quantum yield of single walled carbon nanotubes (SWNTs) [Heller et al J. Am. Chem. Soc. 2004, 126, 14567-14573]. We propose a simple model involving thermal diffusion of excitons along the nanotube axis and quenching at th…
A procedure has been developed for the selective etching of silver from platinum nanoparticles of well-defined shape, resulting in the formation of nearly elementally pure Pt cubes, cuboctahedra, or octahedra, with a largest vertex-to-vertex distance of ∼9.5 nm from Ag-modified Pt nanoparticles. The characterization o…
The effect of interparticle interactions on the magnetic behavior of cobalt ferrite nanoparticles was investigated in a CoFe 2 O 4 /SiO 2 nanocomposite with 50 wt % of magnetic phase. A sample of pure cobalt ferrite nanoparticles prepared by the same method was also studied, as reference. Both samples show irreversibl…
Criteria for the evaluation of hardware and software for the collection of charge density diffraction data are presented with examples. Evaluation of charge density studies using area detectors (based on 61 data sets) indicates that, although it is possible to obtain excellent data using such detectors, there are sign…
This work reports the structural characterization of illite-1M from northern Hungary, with the first attempt to refine the structure model and locate the interlayer water molecule. Structural characterization was accomplished using state-of-the-art analytical methods available for clays. The results illustrate the sta…
The synthesis and photophysical properties of butadiyne-linked chlorophyll and porphyrin dimers in toluene solution and in several self-assembled prismatic structures are described. The butadiyne linkage between the 20-positions of the macrocycles results in new electronic transitions polarized along the long axes of…
The preparation of (R, R)- and (S, S)-salen Al(OR) complexes, where R = Et, CH2(i)Pr, CH2(t)Bu, and CH2CH(S)MeCl, are reported, along with their reactions with rac-lactide (salen = N, N'-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamino). Rapid, reversible coordination of LA to the salen metal complex is obser…
Electrospinning of collagen (COL)/silk fibroin (SF) blend solutions in 1,1,1,3,3,3-hexafluoro-2-propanol was investigated for fabrication of a biocompatible and biomimetic nanostructured scaffold for tissue engineering. The morphology of the electrospun COL/SF blend nanofibers was observed by scanning electron microsc…
In a very recent x-ray magnetic circular dichroism experiment concerning with Ru and Rh impurities and metal films on Ag(001) substrate, no local magnetic momen ts were displayed in direct contradiction with previous theoretical works. It is thought that there can be three main reasons for this inconsistency: relaxati…
Nanostructured Ag0.8Pbm+xSbTem+2 (m = 18, x = 4.5) system thermoelectric materials have been fabricated by combining mechanical alloying (MA) and spark plasma sintering (SPS) methods followed by annealing for several days to investigate the effect on microstructure and thermoelectric performance. It was found that app…
The microarc oxidation (MAO) films on AZ31 magnesium alloy were modified by high-intensity pulsed ion beam (HIPIB) at an ion current density of 200 A/cm2 with 1-5 shots. The modified MAO films presented a corrosion resistance superior to that of the original films. Scanning electron microscopy (SEM) observation reveal…
Electrochemical corrosion behaviors of two common-used ship coatings——epoxy aluminum coating, chloride rubber iron red coating and their composite coatings immersed in 3.5%NaCl solution were investigated using electrochemical impedance spectroscopy combined with open circuit potential measurements and SEM micrograph a…