Nanocellulose-based self-standing films are becoming a substrate for flexible electronics, diagnostics, and sensors. Strength and surface chemistry are vital variables for these film-based endeavors, the former is one of the assets of nanocellulose. To contribute to the latter, nanocellulose films are tuned with a side-specific functionalization, having an aldehyde and a carboxyl side. The functionalities were obtained combining premodification of the film components by periodate oxidation with ozone post-treatment. Periodate oxidation of cellulose nanocrystals results in film components that interact through intra- and intermolecular hemiacetals and lead to films with an elastic modulus of 11 GPa. The ozone treatment of one film side induces conversion of the aldehyde into carboxyl functionalities. The ozone treatment on individual crystals was largely destructive. Remarkably, such degradation is not observed for the self-standing film, and the film strength at break is preserved. Preserving a physically intact film despite ozone treatment is a credit to using the dry film structure held together by interparticle covalent linkages. Additionally, gas-phase post-treatment avoids disintegration that could result from immersion into solvents. The crystalline cellulose "Janus" film is suggested as an interfacial component in biomaterial engineering, separation technology, or in layered composite materials for tunable affinity between the layers.
机构:
Imperial Coll London, Dept Aeronaut, South Kensington Campus, London SW7 2AZ, EnglandImperial Coll London, Dept Aeronaut, South Kensington Campus, London SW7 2AZ, England
Yang, Kris Y.
Wloch, Daniela
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Imperial Coll London, Dept Aeronaut, South Kensington Campus, London SW7 2AZ, EnglandImperial Coll London, Dept Aeronaut, South Kensington Campus, London SW7 2AZ, England
Wloch, Daniela
Lee, Koon-Yang
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Imperial Coll London, Dept Aeronaut, South Kensington Campus, London SW7 2AZ, England
Imperial Coll London, Inst Mol Sci & Engn, London SW7 2AZ, EnglandImperial Coll London, Dept Aeronaut, South Kensington Campus, London SW7 2AZ, England
机构:
Univ Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, Brazil
Silva, Rodrigo S.
Cardozo, Herbert M.
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Univ Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, Brazil
Cardozo, Herbert M.
Ferreira, Jane Z.
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Univ Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, Brazil
Ferreira, Jane Z.
Ferreira, Carlos A.
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Univ Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, Brazil
Ferreira, Carlos A.
Meneguzzi, Alvaro
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Univ Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Escola Engn, Programa Posgrad Engn Minas Met & Mat, BR-91509900 Porto Alegre, RS, Brazil
Meneguzzi, Alvaro
POLIMEROS-CIENCIA E TECNOLOGIA,
2012,
22
(03):
: 288
-
294
机构:
Univ Puerto Rico, Dept Phys, San Juan, PR 00936 USA
Univ Puerto Rico, Inst Funct Nanomat, San Juan, PR 00931 USAUniv Puerto Rico, Dept Phys, San Juan, PR 00936 USA
Varshney, Deepak
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Kumar, Ashok
Guinel, Maxime J. -F.
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Univ Puerto Rico, Dept Phys, San Juan, PR 00936 USA
Univ Puerto Rico, Inst Funct Nanomat, San Juan, PR 00931 USA
Univ Puerto Rico, Dept Chem, San Juan, PR 00936 USAUniv Puerto Rico, Dept Phys, San Juan, PR 00936 USA
Guinel, Maxime J. -F.
Weiner, Brad R.
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h-index: 0
机构:
Univ Puerto Rico, Inst Funct Nanomat, San Juan, PR 00931 USA
Univ Puerto Rico, Dept Chem, San Juan, PR 00936 USAUniv Puerto Rico, Dept Phys, San Juan, PR 00936 USA