摘要:
The invention relates to a nano composite for thermal insulation especially for fireproofing purposes, which can be obtained by combining (A) at lest 35 wt. % of nanoscaled, optionally surface modified particles of an inorganic compound; (B) 10-60 wt. % of a copound with at least two functional groups which can react and/or interact with surface groups of nanoscaled particles (A), (C) 1-40 wt. % of water and/or an organic solvent, which has no functional groups or only one which is defined in (B), wherein the above-mentioned percentages relate to the sum of constituents (A) (B) and (C) and (D) = 0-10 wt. % (in relation to the nano composite) of additives.
摘要:
The invention relates to transparent organic/inorganic composites with low hydroxyl group content, based on silicic acid heteropolycondensates having extremely low water uptakes. These composites are obtained for example by nonhydrolytic condensation of chlorosilanes with polymerizable groups and optionally fluorinated groups, with the help of a condensation agent (e.g. t-butanol) capable of non hydrolytic condensation of this chlorosilane, and thermal and/or photochemical polymerization of the obtained condensation product, preferably in the presence of preferably fluorinated organic monomers.
摘要:
The invention describes a method for producing a shaped piece suitable for optical purposes comprising the joint radical polymerisation of a precondensate (A), that is derived from at least one hydrolytically condensable silane (a) with at least one radical polymerisable X grouping, and of a monomer (B) with at least two radical polymerisable Y groupings wherein the numerical ratio X groupings: Y groupings is not greater than 5:1. The shaped pieces produced in this way are characterised in that they are highly transparent and homogeneous, stress-free, scratch and scuff resistant, have a high mechanical strength, etc.
摘要:
Beschrieben wird ein Verbundwerkstoff, der gekennzeichnet ist durch ein Substrat auf Basis von Glasfasern, Mineralfasern oder Holzwerkstoffen und ein damit in funktionellem Kontakt stehendes Nanokomposit, das erhältlich ist durch Oberflächenmodifizierung von a) kolloidalen anorganischen Partikeln mit b) einem oder mehreren Silanen der allgemeinen Formel (I)
R x -Si-A 4-x (I)
worin die Reste A gleich oder verschieden sind und Hydroxylgruppen oder hydrolytisch abspaltbare Gruppen darstellen, ausgenommen Methoxy, die Reste R gleich oder verschieden sind und hydrolytisch nicht abspaltbare Gruppen darstellen und x den Wert 0, 1, 2 oder 3 hat, wobei bei mindestens 50 Stoffmengen-% der Silane x ≥ 1 ist; unter den Bedingungen des Sol-Gel-Prozesses mit einer unterstöchiometrischen Wassermenge, bezogen auf die vorhandenen hydrolysierbaren Gruppen, unter Bildung eines Nanokomposit-Sols, gegebenenfalls weitere Hydrolyse und Kondensation des Nanokomposit-Sols vor dem Inkontaktbringen mit dem Substrat und anschließende Härtung.
摘要:
The invention relates to nanoparticles with a core of inorganic primary particles the surface of which is completely or partially covered by a coating by reacting them with organosilane or polyorganosilane that contains functional groups. The particles have a zeta potential of 0 to + 100 mV in a neutral pH range of 7.0 to 7.5. The nanoparticles form nanoparticle-polynucleotide complexes with polynucleotides (for example DNA). Said nanoparticle-polynucleotide complexes are used to transfect target cells or for gene therapy.
摘要:
Disclosed is a method for producing a substrate having a structured surface made of hydrophobic and hydrophilic areas, according to which the surface of a substrate that is provided with a hydrophilic layer topped by a hydrophobic layer is exposed so as to obtain an image, the hydrophilic layer being uncovered in the exposed areas as the superimposed hydrophobic layer decomposes during exposure. Particularly good results are obtained if the hydrophilic layer is photocatalytically active such that the hydrophobic layer decomposes in a photocatalytic manner. The substrates obtained by the inventive method are extremely suitable for printing microstructures onto a receiving medium.
摘要:
The invention relates to a method for producing composite particles in which superparamagnetic iron oxide particles having a diameter of less than 30 nm are contained in a polysiloxane matrix comprising functional groups. The composite particles obtained by the method are suitable for magnetic separation methods.