Properties of precipitated silicas, modified with 3‐amino‐propyltriethoxysilane as semi‐finished product for preparation of pigments

Abstract

Access to this document was granted through an Emerald subscription provided by NORTH CAROLINA STATE UNIVERSITY For Authors:If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service. Information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comWith over forty years' experience, Emerald Group Publishing is a leading independent publisher of global research with impact in business, society, public policy and education. In total, Emerald publishes over 275 journals and more than 130 book series, as well as an extensive range of online products and services. Emerald is both COUNTER 3 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractSurface of precipitated silica was modified with 3aminopropyltriethoxysilane. The optimum solvent was selected, in which the silane coupling agent was deposited on silica surface. Basic physicochemical properties of the modified silica were estimated. Methods of evaluating silica surface modification extent were presented, taking advantage first of all of its altered hydrophilicity and of differences in condensation extent of surface silanol groups. The modified silica was used as adsorbent capable of trapping water soluble organic amines. Electronic accessThe research register for this journal is available at

Zeta-Potential Investigation and Experimental Study of Nanoparticles Deposited on Rock Surface To Reduce Fines Migration

“…Figs. 14 through 17 indicate the presence of silanol groups on the surface at low NP concentration, in which the band near 3748 cm -1 is typical for silanol groups (Krysztafkiewicz and Binkowski 1999). The results indicate an absence of peak for silanol groups for particles coated with magnesia or silica NPs because of their removal by these two NPs, whereas this peak is present for uncoated silica particles and silica coated with alumina.…”

“…The surface properties of silica depend on the presence of this hydroxyl group. It is important to mention that this group is naturally different from adsorbed molecules of water (Krysztafkiewicz and Binkowski 1999). The removal of silanol groups from the surface by NPs increases the attraction between fines and surface, because the surface becomes more positive compared with the reference case.…”

Biomimetic Intrafibrillar Mineralization of Type I Collagen with Intermediate Precursors-loaded Mesoporous Carriers

“…Although these MSNs were capable of loading Pa-ACP via capillary imbibition 20 , this is not an efficient controlled-release system because both Pa-ACP (−32.91 ± 1.32 mV) and MSNs (−12.36 ± 0.08 mV) have negative zeta potentials, which render the release of Pa-ACP too fast in the absence of electrostatic attraction ( Supporting Information S2 ). To enable effective uptake of Pa-ACPs and their efficient release, template-free MSNs were amine-functionalized by post-synthesis grafting with APTES 21 22 to produce AF-MSNs with a positive zeta potential (18.41 ± 1.34 mV; Supporting Information S2 ). The TEM image of the parent MSNs ( Fig.…”

Simultaneous Vapor‐Phase Polymerization of PEDOT and a Siloxane into Organic/Inorganic Hybrid Thin Films

“…Consideration of these results indicate the following scenario: at low amounts of FTS deposited on the substrate both EDOT and ASSQ polymerize (with a higher polymerization rate for ASSQ as discussed above); however, due to the low content of FTS the hydrolysis/condensation of ASSQ is incomplete, leaving some of the OH groups on ASSQ unreacted. The amino groups present can then be easily protonated by OH groups from ASSQ giving rise to ${\rm NH}_{{\rm 3}}^{{\rm + }} $ and Si–O – 34, 35. With high amounts of FTS coated on the substrate, the ASSQ hydrolyzes more fully resulting in less free OH groups and consequently less protonated amino groups and more of the free amines, as observed in Figure 4(a), spectrum 3.…”