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Title: Synthesis of l-cystine nanotubes by alkalinization of l-cysteine in the presence of gallium nitride
Author: Jasso-Gastinel, C.F.
García-Enriquez, S.
Gonzalez-Ortiz, L.J.
Issue Date: 2008
Abstract: Anionic exchange resins with a gradient in polymer composition were prepared in two stages. After P(S-co-DVB) suspension beads were obtained, N,N-diethylaminoethyl methacrylate monomer was let to diffuse into the beads at 25 °C, and immediately photopolymerized to fix the gradient polymer composition with high surface concentration of ion exchanger. Chemical composition through the radial position was estimated by means of a mathematical algorithm and using UV spectroscopy. Resin characterization included particle size distribution, "settled" density and total anion exchange capacity, following ASTM D-2187. Values were compared with a porous commercial resin (Amberlite IRA900RF Cl). Since non porous structure with high ion exchange capacity resins were obtained, useful resins for ion exchange with long term stability can be prepared with this methodology. " 2007 Springer-Verlag.",,,,,,"10.1007/s00289-007-0825-2",,,"","",,,,,,"6",,"Polymer Bulletin",,"777
WOS",,,,,,,,,,,,"Synthesis and characterization of anionic exchange resins with a gradient in polymer composition for the PS-co-DVB/PDEAMA-co-DVB system",,"Article" "46729","123456789/35008","Ortega, J.A.C., Departamento de Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, 44860 Guadalajara, Jalisco, Mexico",,"Ortega, J.A.C.",,"2013",,"In this paper we copolymerized N-isopropylacrylamide (NIPA) with N, N, dimethylacrylamide (DIMA). The increase in the proportion of DIMA added resulted in a proportional increase over the transition temperature, as well as on the ability of samples to absorb water. An increase in the DIMA concentration also reduced the volumetric fraction and the rate of water released, in the transition point. After reaching swelling equilibrium at 25 C the samples were heated to 38 C for determining the diffusion coefficient.",,,,,,"10.4322/polimeros.2013.080",,,,"",,,,,,"2",,"Polimeros",,"189
WOS",,,,,,"Diffusion coefficient; Hydrogels; N-isopropylacrylamide; N-N- dimethylacrylamide; Thermosensitive",,,,"Synthesis of thermosensitive hydrogels of poly(N-isopropylacrylamide)-co- poly(N,N-dimethylacrylamide) [Síntesis de hidrogeles termosensibles de poli(n-isopropilacrilamida) -co-poli(N,N,-dimetilacrilamida)]",,,,"Article", "46722","123456789/35008",,"Arizaga, G.G.C., Departamento de Química, Universidad de Guadalajara, Marcelino García Barragán 1421, CP 44430 Guadalajara, Jalisco, Mexico",,"Arizaga, G.G.C.",,"2013",,"The alkaline oxidation of l-cysteine (l-Cys) was conducted in aqueous media forming the insoluble l-cystine dimer as confirmed by X-ray diffraction. In another experiment, a gallium nitride film was added to the l-Cys solution and the l-cystine crystals presented a preferential growth. The transmission electron microscopy images showed the formation of single- and multi-wall l-cystine nanotubes. The infrared and high resolution electron microscopy data suggested that the growth of the tubes resulted from the successive staking of l-cystine dimers onto the (0 0 1) family of planes, which was a consequence of the ionic assembly between l-cystine over a layer of l-Cys molecules previously grafted to the gallium nitride particles. " 2013 Elsevier B.V. All rights reserved.
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