Synthesis of columnar hydrogel colloidal crystals in...

Colloid systems and wetting agents; subcombinations thereof; pro – Continuous or semicontinuous solid phase – The solid phase contains organic material

Reexamination Certificate

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C516S102000, C516S104000, C516S106000

Reexamination Certificate

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07989505

ABSTRACT:
The compositions of hydrogel colloidal crystals are made from mixing an aqueous suspension of poly-N-isopropylacrylamide (“PNIPAM”)-co-allylamine microgels with dichloromethane, forming a PNIPAM-co-allylamine/dichloromethane mixture. The PNIPAM-co-allylamine/dichloromethane mixture is incubated for a period of time at a given temperature, forming the colloidal crystal material. The colloidal crystals can be stabilized by diffusing a glutaric dialdehyde solution into the colloidal crystal material. The concentration of polymer matrix microgels can determine the orientation of random or columnar crystals.

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Hellweg T, Dewhurst CD, Bruckner E, Kratz K, Eimer W. Colloidal Crystals Made of Poly(N-isopropylacrylamide) Microgel Particles. Colloid and Polymer Science. Oct. 2000;278(1):972-978.
PCT Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration dated Mar. 15, 2007.

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