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Seeded Growth of Asymmetric Binary Nanocrystals Made of a Semiconductor TiO2 Rodlike Section and a Magnetic g-Fe2O3 Spherical Domain

All Rights Reserved. Seeded Growth of Asymmetric Binary Nanocrystals Made of a Semiconductor TiO2 Rodlike Section and a Magnetic g-Fe2O3 Spherical Domain. Buonsanti, Raffaella; Grillo, Vincenzo; Carlino, Elvio; Giannini, Cinzia; Curri, Maria Lucia; Innocenti, Claudia; Sangregorio, Claudio; Achterhold, Klaus; Parak, Fritz Guenter; Agostiano, Angela; Cozzoli, Pantaleo Davide (Dipartimento di Chimica, Universita di Bari, Bari I-70126, Italy). 62637-93-8 and 112-88-9 are also occured in this study. Journal of the American Chemical Society, 128(51), 16953-16970 (English) 2006 American Chemical Society. CODEN: JACSAT. ISSN: 0002-7863. DOCUMENT TYPE: Journal CA Section: 57 (Ceramics) Section cross-reference(s): 66, 75, 77, 78 Asym. binary nanocrystals (BNCs), comprising one c-axis elongated anatase TiO2 section and one g-Fe2O3 spherical domain attached together, are synthesized by heterogeneous nucleation of iron oxide onto the longitudinal facets of TiO2 nanorods in a ternary surfactant mixt. The topol. controlled compn. of the BNCs is ascertained by a combination of powder X-ray diffraction, Raman and Moessbauer spectroscopy, high-angle annular dark-field imaging, and high-resoln. TEM lattice fringe mapping, while their size-dependent magnetic behavior is demonstrated by a.c. susceptibility measurements. The heteroepitaxial growth proceeds through a mechanism never obsd. before for colloidal nanoheterostructures: the two domains share a restricted and locally curved junction region, which accommodates efficiently the interfacial strain and retards the formation of misfit dislocations. It is believed that these BNCs, which combine the properties of two technol. relevant oxide materials, can pave the way to reinforced applications in several fields of nanoscience, such as in photocatalysis, in malignant cell treatments, and in nanocrystal assembly. .

Dielectric Relaxation of Aqueous Trimethylamineoxide Solutions

Dielectric Relaxation of Aqueous Trimethylamineoxide Solutions. Shikata, Toshiyuki; Itatani, Shyuji (Department of Macromolecular Science, Osaka University, Toyonaka, Osaka 560-0043, Japan).In this experiment, several chemicals are used like 62637-93-8 Journal of Solution Chemistry, 31(10), 823-844 (English) 2002 Kluwer Academic/Plenum Publishers. CODEN: JSLCAG. ISSN: 0095-9782. DOCUMENT TYPE: Journal CA Section: 68 (Phase Equilibriums, Chemical Equilibriums, and Solutions) Section cross-reference(s): 76 Dielec. relaxation was examd. for aq. trimethylamineoxide (TMAO) solns. over a wide concn. (c) range. The dielec. relaxation of TMAO was described by a Debye-type function with a relaxation time of about 3 ′ 10-11 s, with the strength proportional to c. The no. of water mols. tightly hydrated to unprotonated TMAO was estd. to be two. Ab initio calcns. predict the magnitudes of the dipoles for individual TMAO and TMAO tightly hydrated by two water mols., to be 4.9 and 4.2 D, resp. When the amt. of HBr added was increased, dielec. spectra were described by two modes with relaxation times, about 3 ′ 10-11 and the about 8 ′ 10-10. The fast relaxation was assigned to the rotational mode of unprotonated TMAO tightly hydrated by two water mols., and the slow mode to the rotational mode of dimers formed between a protonated and unprotonated TMAO due to hydrogen bonding. .