Abstract:
Die Erfindung bezieht sich auf ein Verfahren und eine Anordnung zur Bearbeitung von Trägermaterial durch Schwerionenbestrahlung und nachfolgenden Ätzprozess, bei dem die Schwerionenbestrahlung so durchgeführt wird, dass der Einfall eines Strahlenbündels (1) energiereicher Schwerionenstrahlung (1.1) auf eine Trägeroberfläche (2) unter mindestens zwei unterschiedlichen Winkeln stattfindet. Erfindungsgemäss wird dabei die Fluenz, die Energie und die Einfallsrichtung der Schwerionenstrahlen (1.1) so gewählt, dass eine maximale Anzahl von sich kreuzenden oder sich treffenden latenten lonenspuren (3) und von gemeinsamen Schnittmengen der Ausnehmungen (4), die durch einen sich an die Schwerionenbestrahlung anschließenden chemischen Ätzprozess erhalten werden, entsteht.
Abstract:
A pore plugging material, for pH dependent membrane diffusion, in which cyclic olefins having phosphazene-functional moieties provide predictable erosion properties when used to plug pores is separation barriers and other porous membranes. Specific properties of the polymers are dependent on several factors, including molecular weight and identity of side groups attached to the phosphazene moiety. However, as a class, phosphazene-functional cyclic olefins provide both predictable erodibility and uniformly benign hydrolysis products and are, therefore, uniquely suitable as pore plugging polymers for separation barriers and membranes of all kinds. The invention, therefore, embraces the provision of a pH-sensitive erodible pore plugging material to pores in separation barriers and membranes of all kinds.
Abstract:
A filter cartridge that includes a track etched membrane sealed therein in a leak-free manner, and a method for making the cartridge. The filter cartridge has a bubble point that is at least 50 % of the bubble point of the track etched membrane. In one embodiment, the method includes disposing the track etched membrane below a heat source and orienting the membrane so that it melts back on itself, and then allowing the membrane to cool to form a leak-free seal.
Abstract:
Current fluctuations typical of those observed with biological channels which are ion selective and inhibited by divalent cations and protons have been observed in synthetic membranes, and a process for controlling permeability of a synthetic membrane to ions and uncharged molecules may be used in a switch or sensor, for example to monitor the content of a solution, to trigger macroscopic events by local microscopic changes and to alter the ionic content of a solution e.g. desalination.
Abstract:
A porous membrane is made by stretching a rubber or plastics material, perforating the material and then reducing the material to decrease the pore size. The material may be a heat shrinkable plastics material which has already been stretched in the course of manufacture. The material is preferably tubular in form and a support, for example a helical spring, may be disposed therein. The porous membrane may be used as a flow control element which has particular application in a method of diffusing a fluid into a surrounding medium, for example air into sewage.
Abstract:
Described are various embodiments of a method for fabricating a polymer membrane having open through holes, and membranes so produced. In some embodiments, a curable polymeric resin is introduced within a micro post structure wherein a material of the micro posts is soluble in a solvent and wherein the curable polymeric resin is insoluble in this solvent such that the structure can be at least partially dissolved to release the membrane once cured.
Abstract:
A filtration cell (10) for a biological sample including an upper chamber for receiving the biological sample to be filtered, a lower chamber in fluid communication with the upper chamber, and a filtration membrane (14) positioned between the upper chamber and the lower chamber is disclosed. A surface of the filtration membrane has a contact angle > 90°. The flow of the biological sample through the upper chamber may be tangential to the filtration membrane and a filtrate passing through the filtration membrane may be collected in the lower chamber. Also, a method of filtering a biological sample including passing the biological sample through an upper chamber of a filtration cell as described above and collecting a filtrate in the lower chamber is disclosed.
Abstract:
The invention relates to an isolated waterproof polymeric nanomembrane comprising pores of different geometric shapes and of a controlled size between 10 and 1000 nm, which is larger than the thickness of the membrane, and a method of producing the same comprising the process steps a. Providing a sacrifice layer on a surface of a solid support; b. Providing a polymerized layer of less than 1000 nm thickness on the surface of the sacrifice layer, by depositing a mixture of a polymer or a polymer precursor with a geometrically undefined pore template which is larger than the thickness of the polymerized layer, optionally followed by polymerization and/or crosslinking; c. Removing the pore template to obtain the polymerized layer with a controlled pore size; and d. Removing the sacrifice layer, thereby separating the solid support from the polymerized layer.