Interfacial properties of cellulose nanoparticles obtained from acid and enzymatic hydrolysis of cellulose

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Interfacial properties of cellulose nanoparticles obtained from acid and enzymatic hydrolysis of cellulose. / Domingues, Amanda A.; Pereira, Fabiano V.; Sierakowski, Maria Rita; Rojas, Orlando J.; Petri, Denise F S.

In: Cellulose, Vol. 23, No. 4, 08.2016, p. 2421–2437.

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Domingues, Amanda A. ; Pereira, Fabiano V. ; Sierakowski, Maria Rita ; Rojas, Orlando J. ; Petri, Denise F S. / Interfacial properties of cellulose nanoparticles obtained from acid and enzymatic hydrolysis of cellulose. In: Cellulose. 2016 ; Vol. 23, No. 4. pp. 2421–2437.

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@article{6e616e9fbb614ee69a3009e14ba2f26f,
title = "Interfacial properties of cellulose nanoparticles obtained from acid and enzymatic hydrolysis of cellulose",
abstract = "Rod-shaped cellulose nanocrystals obtained by acid hydrolysis of eucalyptus fibers (CNCa) presented high aspect ratio (estimated length and width of 180 and 5 nm, respectively) and zeta potential of −(17 ± 1) mV at pH 6. This typical morphology of cellulose nanocrystals was in contrast to nanoparticles obtained upon enzymatic hydrolysis of bacterial cellulose (CNCe), which were asymmetric and irregular due to surface-bound cellulases and presented a distinctive surface roughness. Interestingly, CNCe also displayed axial grooves, to yield a C-shape cross section that has not been reported before. The effect of the characteristic shape and surface chemistry of CNCa and of grooved CNCe was studied at oil/water interfaces and solid surfaces. Emulsions (20 {\%} v/v oil) prepared with the CNCa were more stable than those prepared with CNCe, owing to their characteristic shape and surface chemistry. Hydrophilic (silica surfaces cationized by pre-adsorbed polycation) and hydrophobic (polystyrene films) solid surfaces were used as substrates for the adsorption of CNCe and CNCa for each type of surface. The ellipsometric data and AFM images indicated larger affinity of CNCe than CNCa for the hydrophobic surface. On the other hand, CNCa formed homogeneous monolayer on hydrophilic surfaces, whereas CNCe formed discontinuous films. Sequential adsorption behavior of CNCa on CNCe layers (or vice versa) suggested that the interaction between them is controlled by the orientation of enzymes bound to CNCe.",
keywords = "Adsorption, Cellulose nanocrystals, Enzymatic hydrolysis, Pickering emulsion",
author = "Domingues, {Amanda A.} and Pereira, {Fabiano V.} and Sierakowski, {Maria Rita} and Rojas, {Orlando J.} and Petri, {Denise F S}",
year = "2016",
month = "8",
doi = "10.1007/s10570-016-0965-3",
language = "English",
volume = "23",
pages = "2421–2437",
journal = "Cellulose",
issn = "0969-0239",
number = "4",

}

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TY - JOUR

T1 - Interfacial properties of cellulose nanoparticles obtained from acid and enzymatic hydrolysis of cellulose

AU - Domingues, Amanda A.

AU - Pereira, Fabiano V.

AU - Sierakowski, Maria Rita

AU - Rojas, Orlando J.

AU - Petri, Denise F S

PY - 2016/8

Y1 - 2016/8

N2 - Rod-shaped cellulose nanocrystals obtained by acid hydrolysis of eucalyptus fibers (CNCa) presented high aspect ratio (estimated length and width of 180 and 5 nm, respectively) and zeta potential of −(17 ± 1) mV at pH 6. This typical morphology of cellulose nanocrystals was in contrast to nanoparticles obtained upon enzymatic hydrolysis of bacterial cellulose (CNCe), which were asymmetric and irregular due to surface-bound cellulases and presented a distinctive surface roughness. Interestingly, CNCe also displayed axial grooves, to yield a C-shape cross section that has not been reported before. The effect of the characteristic shape and surface chemistry of CNCa and of grooved CNCe was studied at oil/water interfaces and solid surfaces. Emulsions (20 % v/v oil) prepared with the CNCa were more stable than those prepared with CNCe, owing to their characteristic shape and surface chemistry. Hydrophilic (silica surfaces cationized by pre-adsorbed polycation) and hydrophobic (polystyrene films) solid surfaces were used as substrates for the adsorption of CNCe and CNCa for each type of surface. The ellipsometric data and AFM images indicated larger affinity of CNCe than CNCa for the hydrophobic surface. On the other hand, CNCa formed homogeneous monolayer on hydrophilic surfaces, whereas CNCe formed discontinuous films. Sequential adsorption behavior of CNCa on CNCe layers (or vice versa) suggested that the interaction between them is controlled by the orientation of enzymes bound to CNCe.

AB - Rod-shaped cellulose nanocrystals obtained by acid hydrolysis of eucalyptus fibers (CNCa) presented high aspect ratio (estimated length and width of 180 and 5 nm, respectively) and zeta potential of −(17 ± 1) mV at pH 6. This typical morphology of cellulose nanocrystals was in contrast to nanoparticles obtained upon enzymatic hydrolysis of bacterial cellulose (CNCe), which were asymmetric and irregular due to surface-bound cellulases and presented a distinctive surface roughness. Interestingly, CNCe also displayed axial grooves, to yield a C-shape cross section that has not been reported before. The effect of the characteristic shape and surface chemistry of CNCa and of grooved CNCe was studied at oil/water interfaces and solid surfaces. Emulsions (20 % v/v oil) prepared with the CNCa were more stable than those prepared with CNCe, owing to their characteristic shape and surface chemistry. Hydrophilic (silica surfaces cationized by pre-adsorbed polycation) and hydrophobic (polystyrene films) solid surfaces were used as substrates for the adsorption of CNCe and CNCa for each type of surface. The ellipsometric data and AFM images indicated larger affinity of CNCe than CNCa for the hydrophobic surface. On the other hand, CNCa formed homogeneous monolayer on hydrophilic surfaces, whereas CNCe formed discontinuous films. Sequential adsorption behavior of CNCa on CNCe layers (or vice versa) suggested that the interaction between them is controlled by the orientation of enzymes bound to CNCe.

KW - Adsorption

KW - Cellulose nanocrystals

KW - Enzymatic hydrolysis

KW - Pickering emulsion

UR - http://www.scopus.com/inward/record.url?scp=84969800838&partnerID=8YFLogxK

U2 - 10.1007/s10570-016-0965-3

DO - 10.1007/s10570-016-0965-3

M3 - Article

VL - 23

SP - 2421

EP - 2437

JO - Cellulose

JF - Cellulose

SN - 0969-0239

IS - 4

ER -

ID: 4662993