Topic
Precipitated silica
About: Precipitated silica is a research topic. Over the lifetime, 1401 publications have been published within this topic receiving 20992 citations.
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TL;DR: In this paper, initial and treated silicas of different origin, such as fumed and precipitated silicas and silica gel, were studied using infrared spectroscopy, DSC, NMR, and adsorption methods.
15 citations
Patent•
13 Aug 1996
TL;DR: In this paper, a conductive material for oxygen ion having a small activation energy and high oxygen ion conductivity at low temp. by using specified compd. as the main component and forming a hexagonal crystal structure was presented.
Abstract: PURPOSE: To obtain a conductive material for oxygen ion having a small activation energy and high oxygen ion conductivity at low temp. by using specified compd. as the main component and forming a hexagonal crystal structure as the main structural phase of a sintered compact. CONSTITUTION: This conductive material for oxygen ion is obtd. by mixing La2 O3 , Ce2 O3 , Pr2 O3 , Nd2 O3 , Sm2 O3 , Eu2 O3 , Gd2 O3 , Tb2 O3 , Dy2 O3 as the source material of rare earth elements and precipitated silica, silica gel, crystalline silica, or the like as the source material of SiO2 in a specified proportion, kneading the mixture in an alcohol by using a ball mill, drying, calcining at 1000 deg.C, pulverizing the calcined material, and then sintering at 1300-1700 deg.C. The conductive material for oxygen ion consists essentially of Lnx Si6 O(3x/2)+12 , wherein Ln is tervalent rare earth element such as La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy and x ranges 6
15 citations
Patent•
08 Nov 2010
TL;DR: In this article, the thermoplastic elastomer mixtures are produced by, in a first step, mixing at least one filler selected from the group of precipitated silica, or precipitated silicon dioxide, or carbon black, and then mixing the masterbatch with at least a TPE, with the exception of a TPU.
Abstract: Thermoplastic elastomer mixture which comprises at least one thermoplastic elastomer TPE, with the exception of a thermoplastic polyurethane TPU, and at least one filler from the group of precipitated silica, or precipitated silicate or carbon black. The thermoplastic elastomer mixtures are produced by, in a first step, mixing at least one filler selected from the group of precipitated silica, or precipitated silicate or carbon black, and at least one thermoplastic to give a masterbatch and, in a second step, mixing the masterbatch with at least one thermoplastic elastomer, with the exception of a thermoplastic polyurethane TPU. The thermoplastic elastomer mixture can be used in injection-molded items.
15 citations
TL;DR: In this article, the same P25 material has been encapsulated within a “classical” MCM-41 mesoporous silica and a precipitated silica, and it has been observed that the P25 samples encapsulated in silica present improved CO2 production rates per mol of P25 in the photooxidation of propene, compared to P25 alone as well as the physical mixture of the two components.
Abstract: In this work, we have performed the encapsulation of a reference TiO2 material (P25) in spherical silica with hierarchical porosity using a sol-gel methodology. The same P25 material has been encapsulated within a “classical” MCM-41 mesoporous silica and a precipitated silica. The materials synthesized in this work were characterized by ICP-OES, SEM, TEM, EDX, XRD, UV–VIS, TG, and nitrogen adsorption. It has been observed that the P25 samples encapsulated in silica present improved CO2 production rates per mol of P25 in the photooxidation of propene, compared to P25 alone as well as the physical mixture of the two components. Moreover, the sample with a low content of P25 encapsulated in silica with hierarchical porosity presents the highest CO2 production rates per mol of P25 with respect to the other P25/silica samples, due to a better accessibility of the titania phase and improved illumination of the active phase. Furthermore, the hierarchical porosity of the silica shell material favours mass transport and an increased concentration of reagents by adsorption near the titania phase. This improvement in photocatalytic activity is obtained by following a simple and reproducible synthesis methodology that employs an established silica preparation protocol. Thus, the choice of a silica with an adequate porosity for this application is proven to be a promising advancement in the development of efficient photocatalysts.
15 citations
TL;DR: Amorphous precipitated silica was applied as a carrier for pigments as mentioned in this paper, and the silica surface was modified with silane coupling agents, such as 3-aminopropyltriethoxysilane, N-2-(aminoethyl)-3aminopropyltrimethoxyselane and 3-ureidoprictrimethyselane.
14 citations