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David Hunkeler

Related publications (27)

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Industrial applications of supply chain cost management, along with life cycle costing of goods and services, are increasing. Several industrial sectors, in particular the automotive, electronics, and primary materials, have engaged in programs to coordina ...

2003

Polymer flocculants with improved dewatering characteristics

Jutta Christine Wandrey, David Hunkeler

A high mol. wt. water sol. acrylamide based polymer having improved flocculating properties is provided. The polymer is prepd. by a process, in which a small quantity of a chain branching agent such as methylenebisacrylamide is added to the polymn. reactio ...

2003

Intra-portal injection of 400- microm microcapsules in a large-animal model

Jutta Christine Wandrey, Bertrand Rochat, David Hunkeler, Annemie Rehor

To date, encapsulated grafts have usually been implanted in the peritoneal cavity. This site is, however, not ideal, mainly because of its low blood supply. We have investigated the feasibility of intra-portal injection of (400 microm) microcapsules in the ...

2003

A high molecular weight water soluble graft copolymer having improved flocculating properties is provided. The backbone chain is a heteropolysaccharide comprising amino groups, in particular chitosan, grafted with one or more monoethylenically unsaturated ...

2002

Polymer flocculants with improved dewatering characteristics

Jutta Christine Wandrey, David Hunkeler

A high mol. wt. water sol. acrylamide based polymer having improved flocculating and dewatering properties is provided. The polymer is prepd. by a process in which a small quantity of a chain branching agent is added to the polymn. reaction mixt. continuou ...

(Ecole Polytechnique Federale De Lausanne (Epfl), Switz.).2002

Preparation of water-soluble polymers for flocculants with improved dewatering characteristics

Jutta Christine Wandrey, David Hunkeler

A process for prepg. a water sol. polymer comprises: providing a polymn. reaction mixt. comprising one or more polymerizable ethylenically unsatd. monomers; polymg. the ethylenically unsatd. monomers; and adding to the reaction mixt. during polymn. one or ...

(Ecole Polytechnique Federale De Lausanne (EPFL), Switz.).2002

The large-scale prodn. of microcapsules with defined membrane thickness and permeabilities, both decoupled from the mech. resistance, is demonstrated. Specifically, a novel app., which controls the downstream part of the microencapsulation process has been ...

2002

Polyelectrolyte complex membrane formation has been studied, online, using the synthetic boundary technique of an Optima XL-I anal. ultracentrifuge. This recent method, established by the first author, has now been evaluated concerning its sensitivity to m ...

2002

Study of polyion counterion interaction by electrochemical methods

Jutta Christine Wandrey, David Hunkeler

A review with refs. concerning study of polyion counterion interaction by electrochem. methods is presented. [on SciFinder (R)] ...

Stevenson Ranch, Calif.2002

Materials and methods relating to encapsulation

David Hunkeler, Annemie Rehor

Methods are provided for producing microcapsules based on two oppositely charged polymers, in particular to optimise the permeability and mechanical stability of microcapsules. The capsules are formed by introducing liquid droplets from an aqueous solution ...

2001