Abstract:
2.1. Aufgabe der Erfindung ist es, ein wirtschaftliches Verfahren für die Herstellung von hydrophobierten Aerogelen zur Verfügung zu stellen, das sowohl kostengünstig, als auch ressourcenschonend arbeitet. 2.2. Diese Aufgabe wird gelöst durch die Bereitstellung eines Verfahren zur Herstellung organisch modifizierter Aerogele, indem ein Sol enthaltend [Si0 4/2 ] -Einheiten und [R x SiO (4-X) /2 ] -Einheiten, wobei x gleich oder verschieden sein kann und 1, 2 oder 3 ist und R gleich oder verschieden sein kann und Wasserstoff oder ein organischer, substituierter oder unsubstituierter Rest ist, hergestellt wird, aus dem Sol ein Gel gebildet wird, das erhaltene Gel in Anwesenheit von über 0,1 Gew.-% eines Phasenvermittlers in einem Gemisch enthaltend Organosiloxan und Initiator oberflächenmodifiziert wird, wobei das Gemisch mindestens 20 Gew.-% Organosiloxan enthält und wobei der Initiator aus Säure oder Organosiloxan oder Gemischen daraus besteht und die erhaltenen Gele getrocknet werden. 2.3. Die bereitgestellten Aerogele können als Isolierstoffe, insbesondere in der thermischen Isolierung verwendet werden.
Abstract:
This invention relates to a process for converting silica to polysilicate gels or hydrogels by combining an aqueous silica source with a CO 2 feed stream as the gel initiator, whereby the reaction stream is propelled at high velocity and turbulence maintaining the CO 2 uptake rate in the reaction stream. The invention also relates to a process for converting silica to polysilicate by pre-carbonating water at pressures of equal to or greater than 100 psig before initiating the polysilicate reaction.
Abstract translation:本发明涉及通过将水性二氧化硅源与CO 2 CO 2原料流组合作为凝胶引发剂将二氧化硅转化成聚硅酸盐凝胶或水凝胶的方法,由此反应流以高速度和湍流维持推进 反应流中的CO 2摄取速率。 本发明还涉及通过在开始聚硅酸盐反应之前将等于或大于100psig的压力的水预碳酸化来将二氧化硅转化为聚硅酸盐的方法。
Abstract:
The invention relates to silica gel compositions containing acidified cation exchanging layered silicate materials and methods for preparing such compositions. These silica gel compositions can be contacted with metallocene polymerization catalysts to produce a catalyst composition.
Abstract:
The present invention provides a method of reducing chill haze in a protein containing liquid (especially beverages resulting from fermentation such as beer and wine) by contacting the liquid with silica microgels having an average microgel diameter of at least 18 nm, more preferably at least 45 nm, and most preferably at least 70 nm. It has now been discovered that microgels having an average microgel diameter of less than about 18 nm do not adequately reduce chill haze of a protein containing liquid. In particular, while microgels having an average microgel diameter of less than about 18 nm cause the coagulation of haze-forming components, these components remain suspended in liquid and continue to cause haze despite allowing the liquid to settle for long periods of time. Conversely, it has now been discovered that microgels having an average microgel diameter of at least about 18 nm cause the coagulation and precipitation of haze-forming components and the rapid settling thereof without the use of an organic polymer which acts as a flocculating agent.
Abstract:
Preparing porous particles includes forming a gel including a first liquid and an oxygen-containing compound of a metal, semi-metal, metalloid, or semi-conductor, including an oxide, hydroxide, alkoxide, oxohydroxide, oxoalkoxide, oxo salt, or oxo salt hydrate of the metal, semi-metal, metalloid, or semi-conductor; contacting the gel with a combustible liquid to form a combustible gel; and initiating combustion of the combustible gel to form a substance including porous metal, semi-metal, metalloid, or semi-conductor oxide particles. The combustible liquid can include a volatile solvent. The porous particles have open pores with a range of nanoscale pore sizes. The porous particles may be treated further to form, for example, a composite.
Abstract:
This invention relates to unique abrasive and/or thickening materials that are in situ generated compositions of precipitated silicas and silica gels. Such compositions exhibit different beneficial characteristics depending on the structure of the composite in situ generated material. With low structured composites (as measured via linseed oil absorption levels from 40 to 100 ml oil absorbed/ 1OOg composite), simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels are possible in order to accord the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces. Increased amounts of high structure composite materials tend to accord greater viscosity build and thickening benefits together with such desirable abrasion and cleaning properties, albeit to a lesser extent than for the low structure types. Thus, mid-range cleaning materials will exhibit oil absorption levels from an excess of 100 to 150, and high thickening/low abrasion composite exhibit oil absorption properties in excess of 150. Such an in situ,simultaneously produced precipitated silica/silica gel combination provides such unexpectedly effective low abrasion and high cleaning capability and different thickening characteristics as compared to physical mixtures of such components. Encompassed within this invention is a unique method for making such gel/precipitated silica composite materials for such a purpose, as well as the different materials within the structure ranges described above and dentifrices comprising such.
Abstract:
The analytical pretreatment column of the present invention is filled with at least the inorganic type filler having a number average diameter consisting of double pore structure having both a through pore with a number average diameter of the range of 0.5 to 25 micrometers, and meso pore with number average diameter of the range of 2 to 50 nm.
Abstract:
A method for producing a nanocomposite polymer that includes the step of adding an olefin to a metallocene polymerization catalyst treated dispersion of an acid treated cation exchanging layered silicate material in a solvent so that the olefin polymerizes to form the nanocomposite polymer. An exfoliated acid treated cation exchanging layered silicate material dispersed in a polymer matrix, wherein more than about fifty percent of the acid treated cation exchanging layered silicate material is found by electron microscopy to have five or fewer layers. A metallocene polymerization catalyst treated, acid treated cation exchanging layered silicate material.
Abstract:
The invention relates to silica gel compositions containing acidified cation exchanging layered silicate materials and methods for preparing such compositions. These silica gel compositions can be contacted with metallocene polymerization catalysts to produce a catalyst composition.
Abstract:
O presente invento trata-se de um processo de obtenção de nanoprodutos a base de sílica, via silicato de sódio, como fonte de silício e ácido orgânico, como catalisador das reações de hidrólise e de condensação. Como produtos finais são descritos hidrogel de nanopartículas de sílica e nanopartículas de sílica, que poderão sofrer adsorção de íons em sua superfície de sílica. Uma das inúmeras aplicações que cabem a essas partículas é como material adsorvente, principalmente de íons metálicos, sendo que alguns desses metais apresentam características fungicidas/bactericidas. E com a adsorção de íons metálicos específicos às nanopartículas de sílica, obtêm-se produtos com ação bactericida e fungicida, que podem ser usadas em diversos segmentos da agricultura.