Uses of Colloidal Silicas

Vecchio C, Fabiani F, Gazzaniga A. Use of colloidal silica as a separating agent in film forming processes performed with aqueous dispersion of acrylic resins. Drug Dev Ind Pharm 1995 21(15) 1781-1787. 

Wu, S.T., Schoener, D., and Jemal, M., Plasma phospholipids implicated in the matrix effect observed in liquid chromatography/tandem mass spectrometry bioanalysis Evaluation of the use of colloidal silica in combination with divalent or trivalent cations for the selective removal of phospholipids from plasma, Rapid Commun. Mass Spectrom., 22(18), 2873, 2008. 

Early uses of colloidal silica for catalysis, ceramics, paper and textile applications, strength enhancement in rubber, tobacco treatment, and medicine are discussed. A historical view of the development of applications is highlighted, and future uses are discussed. 

One of the first successful approaches to fabricating large silica glass bodies is based upon the use of colloidal silica particles to form the initial gel [1-5]. Colloidal silica particles can be purchased commercially or fabricated via the peptization of silicon alkoxides under acid conditions. Gelation can be in-... 

Perhaps the simplest use of colloidal silica in this area is its use to firictionize and coat the film base material to both make it easier to be conveyed through the process and also to prevent it from blocking or adhering to itself when rolled up. The use of colloidal silica as an anti-blocking agent is discussed above under the Surface Modification of plastic films. 

Here we wih focus our attention on the use of colloidal silica to make high quality concrete, as retention aid in paper making, as polishing agents for silicon wafers, to provide sohd electrolytes in lead-acid batteries and... 

Some Important, Fairly New Uses of Colloidal Silica/Silica Sol... 

Colloidal silica was introduced as retention aid in paper making less than 25 years ago. The home page of Compo-zil states that in year 2000, 347 paper machines all over the world with a combined production of 26.3 million metric tons of paper and paper board used colloidal silica as retention aid, which probably makes it the largest application of colloidal silica today. Otterstedt and Brandreth [18] described the use of colloidal silica as retention aid in paper making and compared it with other types of retention aids. This section is a substantially abbreviated version of their work, but supplemented with the most recent developments of colloidal silica as retention aid in paper making. 

We have selected six patents or patent applications between 2000 and 2002, which demonstrate the use of colloidal silica in coatings for ink jet applications, and compiled the relevant information in Table 57.8, and one patent application describing the use of silica sols in pigmented inks. 

In this chapter, only gels and precipitates are covered. Payne discusses the preparation and uses of colloidal silicas in Chapter 54, and Ferch discusses the preparation and uses of pyrogenic silicas in Chapter 14. 

Use of colloidal silica in the so-called microfilled composites allows these resins to be polished, so that less wear occurs and less plaque accumulates. It is more difficult, however, to make these with a high fraction of filler. All the dental composites exhibit creep. The stiffness changes by a factor of 2.5 to 4 (depending on the particular material) over a time period from 10 sec to 3 h under steady load [Papadogianis et al, 1985]. This creep may result in indentation of the restoration, but wear seems to be a greater problem. 

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