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Ramirez-Gonzalez, Daniel,Cruz-Rivera, Jose de J.,Tiznado, Hugo,Rodriguez, Angel G.,Guillen-Escamilla, Ivan,Zamudio-Ojeda, Adalberto Techno-Press 2020 Advances in nano research Vol.9 No.1
In this work, we report the use of caffeine as an alternative source of nitrogen to successfully dope graphene (quaternary 400.6 eV and pyridinic at 398 eV according XPS), as well as the growth of silver nanowires (in-situ) in the surface of nitrogen doped graphene (NG) sheets. We used the improved graphene oxide method (IGO), chemical reduction of graphene oxide (GOx), and impregnation with caffeine as source of nitrogen for doping and subsequently, silver nanowires (NW) grow in the surface by the reduction of silver salts in the presence of NG, achieving a numerous of growth of NW in the graphene sheets. As supporting experimental evidence, the samples were analyzed using conventional characterization techniques: SEM-EDX, XRD, FT-IR, micro RAMAN, TEM, and XPS.
Stability of hybrid organosilica materials incorporating a biphenyl moiety
Eduardo R. Magdaluyo, Jr.,Raymond V. Rivera Virtudazo,Leonard P. dela Cruz,Emily V. Castriciones 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.1
Quezon City, PhilippinesThe stability of biphenyl-functionalized ethane-silica hybrid materials was investigated by a calcination process, a hydrothermal test and exposure to UV to determine the integrity of its composition, structure, and morphology. The organosilicas were prepared via surfactant-mediated polymerization of 4,4’-bis(triethoxysilyl)biphenyl organosilane monomer and crosslinked with 1,2-bis(triethoxysilyl)ethane and tetraethoxysilane. Infrared spectroscopic and gravimetric analyses showed that the material was thermally stable below 700 oC. Its hydrothermal stability could be accounted for by the strong covalent integration of the bifunctional organic bridging groups in the silica framework. No significant change was observed in the functional groups when the material was exposed to ultra-violet radiation. Post heat treatment of the materials did not significantly change the interplanar spacing of the (100) plane, but enhanced the spherical particle morphology.
C. G. Garay-Reyes,S. E. Hernández-Martínez,J. L. Hernández-Rivera,J. J. Cruz-Rivera,E. J. Gutiérrez-Castañeda,H. J. Dorantes-Rosales,J. Aguilar-Santillan,R. Martínez-Sánchez 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.2
According to Lifshitz, Slyozov, and Wagner (LSW) and Trans-Interface Diffusion-Controlled (TICD) theoreticalmodels, this paper reports the microstructure and its coarsening behavior of γ' metastable-coherentprecipitates in concentration gradient of Ni-13.75Ti (at%)/Ni generated by diffusion couple. The coarseningof precipitates was evaluated in two different Ti contents (R1-11.4Ti (at%) and R2-13Ti (at%)) generated alongthe concentration gradient and includes average size, size distributions and growth rate. The solvus andmetastable-coherent bimodal lines as determined at 850 °C of 9.16 (at%) and 9.92Ti (at%) respectively byscanning electron microscopy. This paper suggests that elastic strains produced by the matrix/precipitate latticemismatch caused significant deviations between the experimental results and those predicted by the LSW or TIDCtheories. Activation energies for TIDC (Qi) and LSW (Qr) are Qr: 219.69 and 172.61 kJ mol-1for R1 and R2regions, respectively, and Qi: 218.46 and 164.56 kJmol-1for R1 and R2 regions, respectively. A concentration gradientallows the study of various alloys with different concentration and volume-fraction in a single sample.