Topic
Precipitated silica
About: Precipitated silica is a(n) research topic. Over the lifetime, 1401 publication(s) have been published within this topic receiving 20992 citation(s).
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TL;DR: Separation of Antibody-Bound and Unbound Peptide Hormones Labelled with Iodine-131 by Talcum Powder and Precipitated Silica is shown to be separable.
Abstract: Separation of Antibody-Bound and Unbound Peptide Hormones Labelled with Iodine-131 by Talcum Powder and Precipitated Silica
297 citations
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TL;DR: In this paper, the vibrational modes associated with free (isolated) silanol groups on an aerosil silica and a precipitated silica which have been activated in vacuum in the temperature range from 450 to 800 o C.
Abstract: Infrared spectroscopy has been used to study the vibrational modes associated with free (isolated) silanol groups on an aerosil silica and a precipitated silica which have been activated in vacuum in the temperature range from 450 to 800 o C. Both silicas exhibit two Si-O-H angle deformation modes at 760 and 840 cm -1 , indicative of two types of isolated silanol species, called type I and II, respectively
262 citations
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TL;DR: In this article, the surface energies and polarities of filler particles with different modified surfaces were measured by a modified Wilhelmy technique, and a moving die rheometer was employed to observe the filler flocculation at elevated temperatures (160 °C) in rubber mixtures.
Abstract: In material science of elastomers the influence of nanoscale and nanostructured filler particles is of utmost significance for the performance of innovative rubber products, i.e., passenger car tires with ultralow rolling resistance but high wet-grip performance. A better understanding of the physical characteristics of the filler–rubber interface and the filler–rubber interphase as well is necessary to improve the overall macroscopic properties of these elastomeric nanocomposites. Therefore, the surface energies and polarities of filler particles with different modified surfaces were measured by a modified Wilhelmy technique. In all cases the rubber matrix consisted of a solution - styrene butadiene copolymers, filled with 20 or 40 phr pyrogenic or precipitated silica grades with different surface modifications by silanes, and a carbon black sample as reference. A moving die rheometer was employed to observe the filler flocculation at elevated temperatures (160 °C) in rubber mixtures containing no curati...
253 citations
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TL;DR: In this article, carbon black N110 and precipitated silica were used as model fillers to study the effect of filler surface energies on rubber reinfilling performance, and they were selected as fillers with comparable surface area and structure.
Abstract: Carbon black N110 and a precipitated silica, which have comparable surface area and structure, were selected as model fillers to study the effect of filler surface energies on rubber reinf...
227 citations
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TL;DR: In this article, the influence of nano-silica agglomeration on microstructure and properties of the hardened cement-based materials was investigated by using precipitated silica (PS) with very large agglomers and fumed silica with much smaller ones as nanoscale additives.
Abstract: Influence of nano-silica agglomeration on microstructure and properties of the hardened cement-based materials was investigated by using precipitated silica (PS) with very large agglomerates and fumed silica (FS) with much smaller ones as nanoscale additives. The results showed that the addition of either PS or FS refines pore structure of the hardened cement paste. However, the SEM observation revealed that the pozzolanic C–S–H gels from the agglomerates cannot function as binder. There even exists interfacial transition zone between the agglomerates and the bulk paste. The nano-indentation test indicated that the large agglomerates may become weak zones due to their low strength and elastic modulus. It is proposed that the microstructure improvement have nothing to do with the seeding effect, but result from the water-absorbing, filling, and pozzolanic effects. Through PS addition, compressive strength of the mortars and their resistance to calcium leaching and chloride penetration were enhanced. However, these improvements were less significant than those with FS addition. The reason is that much more fillers are provided whereas much fewer weak zones are introduced in the mortar with FS addition than that with PS.
224 citations