Akzo Nobel N.v.

Priva Agro Holding B.v.

Stichting Centrum Voor Micro-electronica Twente

Stichting Centrum Voor Micro-elektronics Twente

David N Reinhoudt

Johannes F Engbersen

Willem Verboom

Erik Kelderman

Peter D Van Der Wal

Jan Gerardus Batelaan

Marcel L Pennings

Albert Van Den Berg

Udo H Verkerk

Hermanus A Holterman

Ernst J Sudholter

Walter P Stauthamer

Gerardus W Honig

Dimitri Rudkevich

Auke G Talma

Jan R Haak

Maria D Skowronska-Ptasinska

The invention relates to an optically non-linear active waveguiding material comprising an optically transparent polymer and a donor group and acceptor group-containing triphenylcarbinol as a dopant. Said dopants have a high hyperpolarizability and have a charge-transfer absorption band which is about the same as that of their corresponding compounds having only one donor-.pi.-acceptor unit. The triphenylcarbinols were found to display good solubility in polymers. Nitro-functionalized triphenylcarbinols are preferred because of their charge-transfer absorption band at a low wavelength (.lambda..sub.max at about 290 nm). Aldehyde-functionalized calix(4)arenes were also found to have this low wavelength charge-transfer absorption band (.lambda..sub.max at about 270 nm). Triphenyls comprising stilbene donor-.pi.-acceptor units are preferred because of their high hyperpolarizability.

Optically non-linear active waveguiding material comprising donor and

The invention relates to an optically non-linear active waveguiding material comprising an optically transparent polymer and a non-linear optical dopant comprising more than one donor-.pi.-acceptor unit. Dopants comprising more than one donor-.pi.-acceptor unit, especially dopants in which the donor-.pi.-acceptor units are positioned in a cyclic group, have a high hyperpolarizability and a charge-transfer absorption band wavelength which is about the same as that of dopants with only one donor-.pi.-acceptor unit. Especially suitable dopants for use are calix(4)arenes. These are provided with acceptor groups at the upper rim and with donor groups at the lower rim. In addition to having excellent hyperpolarizability, these compounds were found to be readily soluble in host polymers, such as polymethylene (meth) acrylate and polystyrene. Because of their charge-transfer absorption band at a low wavelength, optically non-linear active waveguiding structures containing such dopants are suitable for use as frequency doublers. The invention further relates to hitherto undisclosed calix(4)arenes functionalized with nitrostilbene groups, cyanostilbene groups, sulfor stilbene groups, sulfonate stilbene groups, azobenzenes or benzylidene aniline compounds.

Optically non-linear active waveguiding material comprising a dopant

The invention relates to a membrane that is selective for anions, particularly phosphate, comprising an ionophore based on a uranyl complex with the annexed general formula, wherein

Anion-selective membrane and a sensor provided therewith

An ionophore according to the general formula I wherein the substituents are chosen such that the ionophore is either also polymerized in the matrix of a membrane selective for metal ions or interwoven therewith. Thus obtained is a membrane having a long useful life for use in diverse sensors such as ISFET, ion-selective electrode, and the like.

Membrane selective for metal ions

The invention relates to a process for manufacturing a REFET and/or CHEMFET, comprising: (a) covalent bonding of a hydrophilic polymer layer to an isolator layer applied to a semiconductor material; (b) the absorption of water or a watery solution into said hydrophilic polymer layer; and (c) the binding of a hydrophobic polymer layer to the water holding hydrophilic polymer layer. It is advantageous that this water holding hydrophilic polymer layer also contains an electrolyte and/or a buffer. Preferably an ion to be measured with the CHEMFET also forms part of the electrolyte.

Process for manufacturing a REFET or a CHEMFET, and the manufactured

Method of producing an ISFET and same ISFET

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Hengelo, Netherlands

David N Reinhoudt