caa a22 4500 463253884 CHVBK 20180405153348.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10562-007-9141-6 doi (NATIONALLICENCE)springer-10.1007/s10562-007-9141-6 Vibrational spectra and dissociation of aqueous Na2SiO3 solutions [Elektronische Daten] [Istvan Halasz, Mukesh Agarwal, Runbo Li, Neil Miller] To facilitate molecular spectroscopic observation of the mysterious transition of dissolved sodium silicate molecules into nanoparticles of desired silica gel and zeolite structures, the IR and Raman spectra of Na2H2SiO4 monomers are studied here in details. It is demonstrated that the 3-0.2mol/L aqueous solutions of Na2SiO3 and Na2SiO3×9H2O contain mostly Na2H2SiO4 monomers dissociated about 30%-80%, respectively. In contrast to the common belief the Si-O vibrations of these monomers depend on their dissociation level generating FTIR and Raman bands which are frequently associated with polymer silica structures in the current literature. To stay consistent with the molweight and dissociation measurements, these vibrational assignments are revised in this paper. Some unique and unexpected effects of D2O used instead of H2O as solvent are also reported. Springer Science+Business Media, LLC, 2007 Raman spectroscopy nationallicence FTIR spectra nationallicence silicate nationallicence sodium silicates nationallicence soluble silicates nationallicence conductivity nationallicence Halasz Istvan R&D Center, PQ Corporation, 280 Cedar Grove Road, 19428, Conshohocken, PA, USA aut Agarwal Mukesh R&D Center, PQ Corporation, 280 Cedar Grove Road, 19428, Conshohocken, PA, USA aut Li Runbo R&D Center, PQ Corporation, 280 Cedar Grove Road, 19428, Conshohocken, PA, USA aut Miller Neil R&D Center, PQ Corporation, 280 Cedar Grove Road, 19428, Conshohocken, PA, USA aut Catalysis Letters Springer US; http://www.springer-ny.com 117/1-2(2007-08-01), 34-42 1011-372X 117:1-2<34 2007 117 10562 https://doi.org/10.1007/s10562-007-9141-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10562-007-9141-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Halasz Istvan R&D Center, PQ Corporation, 280 Cedar Grove Road, 19428, Conshohocken, PA, USA aut NATIONALLICENCE 700 1- Agarwal Mukesh R&D Center, PQ Corporation, 280 Cedar Grove Road, 19428, Conshohocken, PA, USA aut NATIONALLICENCE 700 1- Li Runbo R&D Center, PQ Corporation, 280 Cedar Grove Road, 19428, Conshohocken, PA, USA aut NATIONALLICENCE 700 1- Miller Neil R&D Center, PQ Corporation, 280 Cedar Grove Road, 19428, Conshohocken, PA, USA aut NATIONALLICENCE 773 0- Catalysis Letters Springer US; http://www.springer-ny.com 117/1-2(2007-08-01), 34-42 1011-372X 117:1-2<34 2007 117 10562 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer