Materials Literature
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Copolyesters were synthesized by using ring-opening polymerization of cyclic poly(butylene terephthalate) oligomers (c-PBT) and ε-caprolactone monomer (CL) in the presence of stannoxane catalyst at an elevated temperature. The in-situ copolymerization was conducted with various c-PBT/CL feed ratios. The copolyesters w…
Based on Monte Carlo simulations, the stable magnetization configurations of an antiferromagnet on a quasiperiodic tiling are derived theoretically. The exchange coupling is assumed to decrease exponentially with the distance between magnetic moments. It is demonstrated that the superposition of geometric frustration…
This paper reports the facile synthetic strategy of a series of novel pi-conjugated dendrimers (G0 and G1) based on 10,15-dihydro-5H-diindeno[1,2-a;1',2'-c]fluorene (truxene) in which the benzene cores are generated "in-situ" from acetyl aromatics by the acid-promoted cyclotrimerizations. The unique NMR behaviors, phy…
Dendrimers based on melamine can reduce the organ toxicity of solubilized cancer drugs administered by intraperitoneal injection. Methotrexate and 6-mercaptopurine, both FDA approved anticancer drugs, are known hepatotoxins. The solubility of these molecules can be increased by mixing them with a dendrimer based on me…
New low-gap thiophene-based regular copolymers are produced by anodic coupling of 3,4-ethylenedioxythiophene-2,5-substituted thieno[3,4- b ]pyrazine (TP), cyclopenta[2,1- b;3,4- b ‘]dithiophen-4-one (CO), and 4-dicyanomethylene-4 H -cyclopenta[2,1- b;3,4- b ‘]dithiophene (CN). The copolymers are characterized by cycli…
Nanoimprint lithography and self-assembly of poly(styrene)- block -poly(methyl methacrylate) (PS- b -PMMA) diblock copolymer are combined to induce order in the phase-separated domains. Tailored periodic arrays of poly(methyl methacrylate) (PMMA) cylinders normal or parallel to neutralized silicon surfaces can be form…
Kinetic Monte Carlo simulation in conjunction with molecular dynamics simulation is utilized to study the effect of the steered deposition on the growth of Cu on Cu(1,1,17). It is found that the deposition flux becomes inhomogeneous in step train direction and the inhomogeneity depends on the deposition angle, when th…
The effect of the variation of oxygen content on structural, magnetic and transport properties in the electron-doped manganites La0.9Te0.1MnOy has been investigated. All samples show a rhombohedral structure with the space group . The Curie temperature decreases and the paramagnetic-ferromagnetic (PM-FM) transition be…
Magnetischer, hochporöser geordneter Kohlenstoff vom CMK-3- und CMK-5-Typ mit reinem Kohlenstoff- oder Kohlenstoff-Stickstoff-Gerüst wurde hergestellt. Die Materialien sind effiziente magnetische Adsorbentien (siehe Bild) oder Katalysatoren, doch kann man sich weit darüber hinaus gehende Anwendungen vorstellen.
The structural, electrical transport and magnetic properties of perovskite oxides La1-xTexMnO3 have been investigated and thus the magnetic phase diagram of La1-xTexMnO3 compounds as a function of temperature and the doping level x has been obtained. All samples have rhombohedral structure and undergo paramagnetic-fer…
A prototype Hamiltonian for the generic patterned magnetic structures, of dipolar interaction with perpendicular anisotropy, is investigated within the finite-size framework by Landau-Lifshift-Gilbert classical spin dynamics. Modifications on the ground state phase diagram are discussed with an emphasis on the disappe…
Temperature-programmed reduction (TPR), synchrotron-based time-resolved X-ray diffraction (TR-XRD), extended X-ray absorption fine-structure (EXAFS), and X-ray absorption near-edge structure (XANES) were employed in this work to systematically study the reaction of CuO and Cu 2 O with CO gas molecules. Both TPR and is…
The growth dynamics of water drops condensed on a superhydrophobic geometrically patterned surface were studied. Drop size evolution at early and intermediate times is self-similar. Drop growth laws do not differ for a flat surface because of a reduction of both drop and substrate dimensionality. A striking observatio…
An alternating-current (ac) magnetic susceptibility measurement for the [(Pc)(2)Tb(III)](0) complex (Pc = phthalocyaninato) has shown that ligand oxidation of the anionic [(Pc)(2)Tb(III)](-) complex gives rise to a significant upward shift of the temperature range where the magnetization response shows a phase lag beh…
Carbon nanotubes, which consist of rolled graphene sheets built from sp(2) hybridized carbon atoms, are now attracting scientists from various disciplines due to their fascinating physico-chemical properties. In this account, we will review the recent progress on the synthetic techniques for the large-scale production…
Die hierarchische Mikro-/Nanostruktur und die niedrige Oberflächenenergie sind die Ursachen der Superhydrophobie eines Polystyrolfilms, der nach einem elektrohydrodynamischen Verfahren erzeugt wurde: Poröse Mikrokügelchen steigern die Superhydrophobie, indem sie die Oberflächenrauheit erhöhen, und eingewobene Nanofase…
Magnetic, highly porous ordered carbon of the CMK-3 and CMK-5 type and with pure carbon or carbon–nitrogen framework were nanoengineered by a sequence of bulk manipulation steps. The materials can be used as efficient magnetic adsorbents (see picture) or catalysts, but applications going far beyond these can be envisa…
A review of the electronic, thermal and mechanical properties of nanotubes is presented, with particular reference to properties that differ from those of the bulk counterparts and to potential applications that might result from the special structure and properties of nanotubes. Both experimental and theoretical aspe…
The oxides that contain both a d 0 transition metal (Ti 4+, Nb 5+, W 6+, etc.) and a lone-pair cation (Sn 2+, Se 4+, Te 4+, etc.) are examined to investigate the influence of the lone-pair cation on the intra-octahedral distortion of the d 0 transition metal. The direction and magnitude of the out-of-center distortion…
A hierarchical micro/nanostructure and low surface energy result in superhydrophobicity in a polystyrene film prepared by the electrohydrodynamics method. The composite film consists of porous microspheres, which contribute to superhydrophobicity by increasing the surface roughness, and interwoven nanofibers, which re…