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SUMMARY:Keynote talk - Structure and rheology of stimuli responsive nanoce
 llulose interfacial layers
DTSTART;VALUE=DATE-TIME:20210610T070000Z
DTEND;VALUE=DATE-TIME:20210610T074000Z
DTSTAMP;VALUE=DATE-TIME:20260529T230411Z
UID:indico-contribution-1108@lindico453.srv.lu.se
DESCRIPTION:Speakers: Peter Fischer (ETH Zurich\, Switzerland)\nThe use of
  particles such as nanocelluloses\, i.e. cellulose nanocrystals (CNC) and 
 nanofibrils (CNF) received increasing attention for the Pickering stabiliz
 ation of fluid interfaces [1]. The adsorption of nanocellulose and nanocel
 lulose-protein composites at oil-water or air-water interfaces facilitates
  the formation of stable and biocompatible emulsions and foams but depends
  heavily on the particles’ surface properties. In this contribution\, we
  review the structure of differently designed adsorption layers by neutron
  reflectivity and interfacial rheology measurements as a function of physi
 co-chemical boundaries conditions (pH\, salts\, enzymes) [2\, 3]\, surface
  properties of the cellulose crystals (natural\, methylation\, esterificat
 ion) [4\, 5]\, and protein or polysaccharide addition [6]. Native unmodifi
 ed CNC (hydrophilic\, negatively charged\, and anisotropic nanoparticles) 
 showed negligible viscoelasticity that could be increased by charge screen
 ing due to a shift from repulsive to attractive CNC interactions. Methylat
 ed CNCs formed dense monolayers with higher dynamic moduli compared to nat
 ive CNCs and could be thermo-gelled into multilayers. The esterified CNCs 
 formed aggregated clusters at the interface\, resulting in a Maxwellian fr
 equency behavior with distinctive relaxation times\, a rarely observed phe
 nomenon for interfacial layers. Scattering length density profiles obtaine
 d from neutron reflectivity measurements are used to elucidate the thickne
 ss and roughness of the adsorption layer\, and in case of nanocellulose-pr
 otein composites\, their spatial composition. Supported by in vivo digesti
 on experiments in humans we rationalize the design principles of nanocellu
 lose-stabilized emulsions and foams for food and drug delivery vehicles [7
 ].\n\n[1] Bertsch P\, Fischer P: Adsorption and interfacial structure of n
 anocelluloses at fluid interfaces\, Advances in Colloid and Interface Scie
 nce 276 (2020) 102089\n[2] Bertsch P\, Fischer P: Interfacial rheology of 
 charged anisotropic cellulose nanocrystals at the air-water interface\, La
 ngmuir 35 (2019) 7937.\n[3] Scheuble N\, Geue T\, Windhab EJ\, Fischer P: 
 Tailored interfacial rheology for gastric stable adsorption layers\, Bioma
 cromolecules 15 (2014) 3139.\n[4] Bertsch P\, Diener M\, Adamcik J\, Scheu
 ble N\, Geue T\, Mezzenga R\, Fischer P: Adsorption and interfacial layer 
 structure of unmodified nanocrystalline cellulose at air/water interfaces\
 , Langmuir 34 (2018) 15195.\n[5] van den Berg MEH\, Kuster S\, Windhab EJ\
 , Adamcik J\, Mezzenga\, R\, Geue T\, Sagis LMC\, Fischer P: Modifying the
  contact angle of anisotropic cellulose nanocrystals: Effect on interfacia
 l rheology and structure\, Langmuir 34 (2018) 10932.\n[6] Scheuble N\, Lus
 si M\, Geue T\, Carriere F\, Fischer P: Blocking gastric lipase adsorption
  and displacement processes with viscoelastic biopolymer adsorption Layers
 \, Biomacromolecules 17 (2016) 3328.\n[7] Scheuble N\, Schaffner J\, Schum
 acher M\, Windhab EJ\, Liu D\, Parker H\, Steingoetter A\, Fischer P: Tail
 oring emulsions for controlled lipid release: Establishing in vitro-in viv
 o correlation for digestion of lipids\, ACS Appl. Mater. Interfaces 10 (20
 18) 17571.\n\nhttps://lindico453.srv.lu.se/event/159/contributions/1108/
LOCATION:Online on Zoom
URL:https://lindico453.srv.lu.se/event/159/contributions/1108/
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