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New article from our group in Coatings on Cellulose Nanocrystals and Starch Nanoparticles

[Translate to English:] Metzger, C.; Sanahuja, S.; Behrends, L.; Sängerlaub, S.; Lindner, M.; Briesen H. Efficiently Extracted Cellulose Nanocrystals and Starch Nanoparticles and Techno-Functional Properties of Films Made Thereof. Coatings 2018, 8, 142. doi:10.3390/coatings8040142

Abstract: Cellulose nanocrystals (CNC) and starch nanoparticles (SNP) have remarkable physical and mechanical characteristics. These properties particularly facilitate their application as high-performance components of bio-based packaging films as alternatives to fossil-based counterparts. This study demonstrates a time-efficient and resource-saving extraction process of CNC and SNP by sulfuric acid hydrolysis and neutralization. The yields of the hydrolyzed products were 41.4% (CNC) and 32.2% (SNP) after hydrolysis times of 3 h and 120 h, respectively. The nanoparticle dispersions were wet-coated onto poly(lactic acid) (PLA) and paper substrates and were incorporated into starch films. No purification or functionalization of the nanoparticles was performed prior to their application. Techno-functional properties such as the permeability of oxygen and water vapor were determined. The oxygen permeability of 5–9 cm3 (STP) 100 µm m?2 d?1 bar?1 at 50% relative humidity and 23 °C on PLA makes the coatings suitable as oxygen barriers. The method used for the extraction of CNC and SNP contributes to the economic production of these nanomaterials. Further improvements, e.g., lower ion concentration and narrower particle size distribution, to achieve reproducible techno-functional properties are tangible.

Oral presentations:
Stefan Schmideder, Christoph Kirse, Julia Hofinger, Sascha Rollié, and Heiko Briesen: "Modeling the separation of microorganisms in bioprocesses by flotation"

Michael Kuhn, Christoph Kirse, and Heiko Briesen: "Population balance modeling and opinion dynamics –a mutually beneficial liaison?"

Christoph Kirse and Heiko Briesen: "Fixed pivot technique for solving a  bivariate model of enzymatic depolymerization of branched starch"

Posters:
Tijana Kovacevic and Heiko Briesen: "A new, area - preserving model of crystal growth and aggregation"

Stefan Schmideder, Tiaan Friedrich, Tijana Kovacevic, Lars Barthel, Philipp Kunz, Vera Meyer, Rudibert King and Heiko Briesen: "Growth of filamentous microorganisms: PBM and experimental determination of rate equations"