Publication

Materials and methods relating to encapsulation

2001
Patents

Abstract

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 of a charged (usually anionic) polyelectrolyte (or a blend) into an aqueous solution of a counter-charged (usually cationic) polyelectrolyte (or a blend). The membrane is formed during the reaction time of the opposite-charged polymers. The capsules are optionally subject to an additional coating step.The methods are characterised by one or more of the following: the use of polyvinylamine (PVAm) of low Mw (

Official source

https://infoscience.epfl.ch/entities/publication/a99cc898-a8e2-4039-b971-793668d4f8d9

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2001
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a99cc898-a8e2-4039-b971-793668d4f8d9

About this result

Related concepts (32)

Polyelectrolyte

Polyelectrolytes are polymers whose repeating units bear an electrolyte group. Polycations and polyanions are polyelectrolytes. These groups dissociate in aqueous solutions (water), making the polymers charged. Polyelectrolyte properties are thus similar to both electrolytes (salts) and polymers (high molecular weight compounds) and are sometimes called polysalts. Like salts, their solutions are electrically conductive. Like polymers, their solutions are often viscous.

Membrane

A membrane is a selective barrier; it allows some things to pass through but stops others. Such things may be molecules, ions, or other small particles. Membranes can be generally classified into synthetic membranes and biological membranes. Biological membranes include cell membranes (outer coverings of cells or organelles that allow passage of certain constituents); nuclear membranes, which cover a cell nucleus; and tissue membranes, such as mucosae and serosae.

Polymer

A polymer (ˈpɒlᵻmər; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function.

Related publications (2)

Materials and methods relating to encapsulation

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Modulating the Swelling Behavior of Polymer Brushes via Interfacial Chemistry

Covalently attached lipid bilayers on planar waveguides for measuring protein binding to functionalized membranes