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      Cristalização convencional de zeólitas e induzida por sementes Translated title: Seed-assisted behavior of zeolite crystallization

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          Translated abstract

          Seed-assisted synthesis of zeolites diminishes crystallization time and enables the industrial use of certain zeolites, which was conventionally unfeasible due to the complexity of synthesis and the cost of organic structure-directing agents. This study reports the primary results of zeolite crystallization in the presence of seeds, which are used as a substitute for organic compounds.

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          Nanoparticle arrays on surfaces for electronic, optical, and sensor applications.

          Andrew Shipway, Eugenii Katz, Itamar Willner (2000)
          Particles in the nanometer size range are attracting increasing attention with the growth of interest in nanotechnological disciplines. Nanoparticles display fascinating electronic and optical properties as a consequence of their dimensions and they may be easily synthesized from a wide range of materials. The dimensions of these particles makes them ideal candidates for the nanoengineering of surfaces and the fabrication of functional nanostructures. In the last five years, much effort has been expended on their organization on surfaces for the construction of functional interfaces. In this review, we address the research that has led to numerous sensing, electronic, optoelectronic, and photoelectronic interfaces, and also take time to cover the synthesis and characterization of nanoparticles and nanoparticle arrays.
          Article 0 comments Cited 226 times – based on 0 reviews     Review now
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            A time-dependent picture of the ultrafast deactivation of keto-cytosine including three-state conical intersections.

            Jesús González-Vázquez, Leticia González (2010)
            Using mixed quantum-classical dynamics, the lowest part of the UV absorption spectrum and the first deactivation steps of keto-cytosine have been investigated. The spectrum shows several strong peaks, which mainly come from the S(1) and S(2) states, with minor contributions from the S(3). The semiclassical trajectories, launched from these three states, clearly indicate that at least four states are involved in the relaxation of keto-cytosine to the ground state. Non-adiabatic transfer between the ππ* and nπ* excited states and deactivation via three-state conical intersections is observed in the very early stage of the dynamics. In less than 100 fs, a large amount of population is deactivated to the ground state via several mechanisms; some population remains trapped in the S(2) state. The latter two events can be connected to the fs and ps transients observed experimentally.
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              Copper(II)-catalyzed hydroxylation of aryl halides using glycolic acid as a ligand.

              Yan XIAO, Yongnan Xu, Hwan-Sung Cheon … (2013)
              Copper(II)-catalyzed hydroxylation of aryl halides has been developed to afford functionalized phenols. The protocol utilizes the reagent combination of Cu(OH)2, glycolic acid, and NaOH in aqueous DMSO, all of which are cheap, readily available, and easily removable after the reaction. A broad range of aryl iodides and activated aryl bromides were transformed into the corresponding phenols in excellent yields. Moreover, it has been shown that C-O(alkyl)-coupled product, instead of phenol, can be predominantly formed under similar reaction conditions.
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                Author and article information

                Contributors
                Luiz H. Vieira: Role: ND
                Mariana V. Rodrigues: Role: ND
                Leandro Martins: Role: ND
                Journal
                Journal ID (publisher): qn
                Title: Química Nova
                Abbreviated Title: Quím. Nova
                Publisher: Sociedade Brasileira de Química (São Paulo )
                ISSN: 1678-7064
                Publication date (Print): 2014
                Volume: 37
                Issue: 9
                Pages: 1515-1524
                Affiliations
                [1 ] Universidade Estadual Paulista Brazil
                Article
                Publisher ID: S0100-40422014000900016
                DOI: 10.5935/0100-4042.20140229
                SO-VID: a0b242ec-6249-4bc4-949f-a287e780d532
                License:

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-4042&lng=en
                Categories
                Subject: CHEMISTRY, MULTIDISCIPLINARY

                ScienceOpen disciplines: General chemistry
                Keywords: zeolites,seeds,structure-directing agents
                Data availability:
                ScienceOpen disciplines: General chemistry
                Keywords: zeolites, seeds, structure-directing agents

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