CC BY-NC-SA 3.0 UnportedMüller, M.Keßler, B.Fröhlich, J.Poeschla, S.Torger, B.2020-09-292020-09-292011https://doi.org/10.34657/4392https://oa.tib.eu/renate/handle/123456789/5763In this contribution we outline polyelectrolyte (PEL) complex (PEC) nanoparticles, prepared by mixing solutions of the low cost PEL components poly(ethyleneimine) (PEI) and poly(acrylic acid) (PAC). It was found, that the size and internal structure of PEI/PAC particles can be regulated by process, media and structural parameters. Especially, mixing order, mixing ratio, PEL concentration, pH and molecular weight, were found to be sensible parameters to regulate the size (diameter) of spherical PEI/PAC nanoparticles, in the range between 80-1,000 nm, in a defined way. Finally, applications of dispersed PEI/PAC particles as additives for the paper making process, as well as for drug delivery, are outlined. PEI/PAC nanoparticles mixed directly on model cellulose film showed a higher adsorption level applying the mixing order 1. PAC 2. PEI compared to 1. PEI 2. PAC. Surface bound PEI/PAC nanoparticles were found to release a model drug compound and to stay immobilized due to the contact with the aqueous release medium.enghttps://creativecommons.org/licenses/by-nc-sa/3.0/620Cellulose modificationColloid coagulationDrug deliveryPoly(acrylic acid)Poly(ethyleneimine)Polyelectrolyte complexPolymer nanoparticlesInternal structureLow costsMixing ratiosModel cellulose filmModel drugsPapermaking processPoly(acrylic acid )Poly(ethyleneimine)Polyelectrolyte complexPolyelectrolyte complexesPolymer nanoparticlesStructural parameterAdsorptionCarboxylic acidsCelluloseCellulose filmsCoagulationDrug deliveryMixingPolyelectrolytesPolyethylenesNanoparticlesAdsorptionCarboxylic AcidsCelluloseCellulose FilmCoagulationColloidsMixingPhPolyelectrolytesPolyethyleneArticle