Abstract:
The present invention is directed to a process for preparing a porous material, at least comprising the steps of providing a gel comprising a solvent (S), wherein the solvent (S) has a volume (V1), pressurizing the gel with carbon dioxide at a temperature and a pressure at which carbon dioxide solubilizes in the solvent (S) forming gas-expanded liquid (EL), wherein the gas-expanded liquid (EL) has a volume (V2) and (V2) is greater than (V1); removing supernatant liquid, and drying the gel. The present invention further is directed to the porous material obtained or obtainable according to the process as such as well as the use of the porous material according to the invention in particular for medical, biomedical and pharmaceutical applications or for thermal insulation.
Abstract:
The present invention is directed to a process for the hydrophobization of a porous silica based compound, the process comprising the steps of providing a composition (I) comprising a porous silica based compound, treating the composition (I) with a composition (II) comprising hexame- thyldisiloxane or its hydrolyzed form, and removing the treated silica based compound. The present invention further is directed to the porous silica based compound obtained by the pro- cess as such as well as the use of the porous silica based compound according to the present invention or a porous silica based compound obtained or obtainable by a process according to the present invention for medical and pharmaceutical applications, as adsorbents, for cosmetic applications, as additive for food, as catalyst support, for the preparation of sensors, or for thermal insulation.
Abstract:
Die vorliegende Erfindung betrifft Verfahren zur Trocknung von Gelpartikeln, insbesondere zur Herstellung von Aerogelen, umfassend das Bereitstellen einer Suspension enthaltend Gelpartikel (P1) und ein Lösungsmittel (LM), das Einfüllen der Suspension in eine Kolonne, die im Gegenstrom von Kohlenstoffdioxid durchströmt wird und das Abtrennen der getrockneten Aerogelpartikel aus der Kolonne, wobei die Suspension im Kopfbereich der Kolonne eingefüllt wird und die getrockneten Aerogelpartikel im unteren Bereich der Kolonne abgetrennt werden, und wobei in der Kolonne Druck und Temperatur so eingestellt werden, dass das Gemisch aus Kohlenstoffdioxid und Lösungsmittel nahezu überkritisch oder überkritisch ist. Das Ausschleusen der Aerogelpartikel kann sowohl über Ausschleusebehälter als auch über eine kontinuierliche Entspannung erfolgen. Weiterhin betrifft die vorliegende Erfindung Aerogelpartikel, erhältlich oder erhalten gemäß einem derartigen Verfahren sowie die Verwendung der erfindungsgemäßen Aerogelpartikel für medizinische und pharmazeutische Anwendungen, als Additiv oder Trägermaterial für Additive für Lebensmittel, als Katalysatorträger, für Kosmetik-, Hygiene-, Wasch- und Reinigungsanwendungen, zur Herstellung von Sensoren, zur Wärmedämmung oder als Kernmaterial für VIPs.
Abstract:
The present invention relates to a process for preparing a porous material, at least comprising the steps of providing a mixture (I) comprising a water soluble polysaccharide, at least one compound suitable to react as cross-linker for the polysaccharide or to release a cross-linker for the polysaccharide, and water, and preparing a gel (A) comprising exposing mixture (I) to carbon dioxide at a pressure in the range of from 20 to 100 bar for a time sufficient to form a gel (A), and depressurizing the gel (A). Gel (A) subsequently is exposed to a water miscible solvent (L) to obtain a gel (B), which is dried. The invention further relates to the porous materials which can be obtained in this way and the use of the porous materials as thermal insulation material, for cosmetic applications, for biomedical applications or for pharmaceutical applications.
Abstract:
The present invention relates to a process for preparing a porous material, at least comprising the steps of providing a mixture (I) comprising a water soluble polysaccharide, at least one compound suitable to react as cross-linker for the polysaccharide or to release a cross-linker for the polysaccharide, and water, and preparing a gel (A) comprising exposing mixture (I) to carbon dioxide at a pressure in the range of from 20 to 100 bar for a time sufficient to form a gel (A), and depressurizing the gel (A). Gel (A) subsequently is exposed to a water miscible solvent (L) to obtain a gel (B), which is dried. The invention further relates to the porous materials which can be obtained in this way and the use of the porous materials as thermal insulation material, for cosmetic applications, for biomedical applications or for pharmaceutical applications.
Abstract:
The present invention relates to a process for preparing a porous material, at least comprising the steps of providing a mixture (I) comprising a water soluble polysaccharide, at least one compound suitable to react as cross-linker for the polysaccharide or to release a cross-linker for the polysaccharide, and water, and preparing a gel (A) comprising exposing mixture (I) to carbon dioxide at a pressure in the range of from 20 to 100 bar for a time sufficient to form a gel (A), and depressurizing the gel (A). Gel (A) subsequently is exposed to a water miscible solvent (L) to obtain a gel (B), which is dried. The invention further relates to the porous materials which can be obtained in this way and the use of the porous materials as thermal insulation material, for cosmetic applications, for biomedical applications or for pharmaceutical applications.