@Article{SantosLopeBaldCass:2020:PrOrSi,
               author = "Santos, Renata Patr{\'{\i}}cia dos and Lopes, Cristina Moniz 
                         Araujo and Baldan, Maur{\'{\i}}cio Ribeiro and Cassu, Silvana 
                         Navarro",
          affiliation = "{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and 
                         {Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Tecnol{\'o}gico de Aeron{\'a}utica (ITA)}",
                title = "On the preparation of organosilanized silicon carbide aqueous 
                         suspension",
              journal = "Ceramics International",
                 year = "2020",
               volume = "46",
               number = "2",
                pages = "1793--1803",
                month = "Feb.",
             keywords = "(D)SiC, Aqueous suspension stability, Polyethylenimine, pH.",
             abstract = "The functionalization of ceramic nanoparticles with organosilanes 
                         is commonly employed to improve the surface adhesion mechanism for 
                         specific applications, especially in polymer composites. However, 
                         this surface modification changes the behavior of the 
                         nanoparticles in suspension, which is important for applications 
                         that require preparation involving aqueous medium. In the present 
                         study the influence of organosilanization on the size and 
                         stability of SiC particles in aqueous medium was evaluated. 
                         Initially, SiC particles were organofunctionalized using 
                         (3-aminopropyl) triethoxysilane through two different reaction 
                         routes (SiCSil I and SiCSil II). XPS spectroscopy of solid 
                         particles showed higher content of nitrogen atoms arising from the 
                         organosilanization reaction in the SiCSil II, prepared in ethanol. 
                         Compared to the unmodified SiC aqueous suspension, the 
                         organosilanized SiC aqueous suspensions presented much higher 
                         particle sizes, with the largest particle size distribution, 
                         assigned mainly to the organosilanization of SiC agglomerates. 
                         Subsequently, polyethylenimine (PEI) was tested as a dispersant 
                         for the aqueous suspensions, aiming to increase the repulsion 
                         forces among the particles and induce their de-agglomeration. The 
                         addition of PEI to SiC and SiCSil II particle aqueous suspensions 
                         resulted in a drastic reduction in the particle size (up to 40% 
                         (D50) at pH 5.5) and narrowest particle size distribution over a 
                         wide pH range. This fact was attributed to the PEI electrosteric 
                         effect on aqueous suspensions containing SiC or SiCSil II, which 
                         was supported by dynamic laser scattering and zeta potential 
                         results.",
                  doi = "10.1016/j.ceramint.2019.09.154",
                  url = "http://dx.doi.org/10.1016/j.ceramint.2019.09.154",
                 issn = "0272-8842",
             language = "en",
           targetfile = "santos_on the.pdf",
        urlaccessdate = "28 abr. 2024"
}