Modulating the zeta potential of cellulose nanocrystals using salts and surfactants

Prathapan, Ragesh; Thapa, Rajiv; Garnier, Gil

doi:10.1016/j.colsurfa.2016.08.075

Cited by 170 publications

(109 citation statements)

References 36 publications

(7 reference statements)

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“…6c) what is comparable with other published data (Jiang and Hsieh 2013;Prathapana et al 2016;Wei et al 2014). The use of oxidative agent (NaClO) in the extraction procedure (Szymańska-Chargot et al 2017) can result in the hydroxyl groups oxidation to carboxyl ones, which are dissociated in water at neutral pH (Wei et al 2014).…”

Section: Mechanical Properties Of Nanopaperssupporting

confidence: 79%

Effect of ultrasonication on physicochemical properties of apple based nanocellulose-calcium carbonate composites

et al. 2018

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In order to improve optical properties of materials made of nanocellulose and also minimalize costs, small amounts of mineral fillers such as different forms of calcium carbonate are added. In this work nanocellulose was obtained from apple pomace. The precipitated calcium carbonate (PCC) in amount of 3.74 ± 1.36% of a sample dry matter was deposited on cellulose fibers during isolation process. Isolated cellulose was then treated with ultrasonic method in order to obtain apple cellulose nanofibrills (ACNF)/ PCC nanocomposites. Different ultrasonication conditions were applied in order to evaluate how time (0-60 min) and power (0-400 W) influence on the ACNF/PCC nanocomposites properties. Moreover structure, chemical composition, morphology and rheological properties of both cellulose and composites were characterized. Also the mechanical properties of nanopapers made of ACNF/PCC nanocellulose were measured. The nanofibril structure of ultrasound processed cellulose was confirmed. In all cases samples were pseudoplastic fluids with quite low viscosity. The mean hydrodynamic diameter of particle dispersions decreased the most after use of ultrasounds for 60 min and the obtained dispersions were also the most homogeneous. The elastic modulus of obtained nanopapers were 2-3 GPa and tensile strength 60-70 MPa and in general ultrasonication improved their rigidity.

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Section: Mechanical Properties Of Nanopaperssupporting

confidence: 79%

Effect of ultrasonication on physicochemical properties of apple based nanocellulose-calcium carbonate composites

et al. 2018

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“…On the other hand, the zeta potential of CNC/PEG1000, CNC/PL44, and CNC/PEGMONO dispersions presented values lower than 10 mV. The decrease in zeta potential is due to screening effect of surfactant molecules adsorbed onto CNC surface that clearly increases the effective hydrophobicity of CNC and weakens the electrostatically interactions between nanoparticles . Therefore, except for PEG300, the modification of CNC with surfactants reduced zeta potential values to a range that does not support electrostatic repulsion, as the mechanism that control the dispersion stability of dried CNC/S .…”

Section: Resultsmentioning

confidence: 97%

Influence of morphology and dispersion stability of CNC modified with ethylene oxide derivatives on mechanical properties of PLA‐based nanocomposites

et al. 2018

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The aggregation state of cellulose nanocrystals modified with surfactants (CNC/S) in water and CNC/S powder dispersion stability in chloroform were studied and correlated with mechanical properties of nanocomposites with poly(lactic acid) (PLA). Four types of nonionic surfactants were used: PEG 300, PEG 1000, poly(ethylene glycol) monooleate, and Pluronic® L44 (PL44). The CNC/PL44 showed the smallest size of CNC aggregates dispersed in water before freeze‐drying, as determined by atomic force microscopy. The respective powder also showed the lowest decay rate of relative turbidity among CNC/S dispersions in chloroform. This, together with the improved surface coverage of CNC by PL44, verified by zeta potential (large change in the zeta potential of CNC/S dispersion in chloroform) and thermogravimetric analysis (improved thermal stability of CNC/S powder), yielded the highest tensile strength at break (TS) among PLA/CNC/S nanocomposites. Despite none of surfactants produced nanocomposites with TS higher than PLA or PLA/CNC, the aggregation state of CNC/S in water is well correlated with mechanical properties of PLA/CNC/S nanocomposites prepared by solvent casting. This correlation indicates that hornification cannot be avoided for the conditions used to prepare CNC/S powder and that there are two opposite effects in preparation of PLA/CNC/S nanocomposites. First, the effectiveness of steric barrier of nonionic surfactants against aggregation during freeze‐drying depends on complete surface coverage of CNC, together with hydration of stabilizing chain. Since hydration depends on hydrophilicity of stabilizing chain and compatibility with PLA depends on its nonpolar nature, this strategy alone seems not to be efficient to produce high‐performance nanocomposites. POLYM. COMPOS., 40:E399–E408, 2019. © 2018 Society of Plastics Engineers

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“…The effect of surfactants on the formation of the film was evaluated by using anionic SDS and cationic CTAB. Their respective interactions with cellulose are very distinct; whereas CTAB has a strong interaction with CNCs, leading to aggregation from a low relative surfactant concentration, SDS displays negligible interaction with CNCs and predominantly adsorbs at the air–water interface …”

Section: Resultsmentioning

confidence: 99%

Optical Properties of Self‐Assembled Cellulose Nanocrystals Films Suspended at Planar–Symmetrical Interfaces

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Guo

et al. 2017

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Hierarchically structured materials comprising rod-like, chiral, nanoparticles are commonly encountered in nature as they can form assemblies with exceptional optical and mechanical characteristics. These include cellulose nanocrystals (CNCs), which have a large potential for the fabrication of bioinspired materials mimicking those advanced properties. Fine-tuning the optomechanical properties of assemblies obtained from CNCs hinges on the transformations from suspensions of liquid crystals to long-range order in the dry state. So far, associated transitions have been studied using trivial interfaces such as planar substrates. Such transitions are explored as they evolve onto meshed supports. The meshed substrate offers a complex topology, as is encountered in nature, for the formation of CNCs films. The CNCs self-assembly occurs under confinement and support of the framework bounding the mesh openings. This leads to coexisting suspended and supported nanoparticle layers exhibiting nematic and/or chiral nematic order. Optical microscopy combined with crossed polarizers indicate that the formation of the suspended films occurs via intermediate gelation or kinetic arrest of CNCs across the mesh's open areas. The formation of self-standing, ultrathin films of CNCs with tunable optical properties, such as selective reflections in the visible range (structural color), is demonstrated by using the presented simple and scalable approach.

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Modulating the zeta potential of cellulose nanocrystals using salts and surfactants

Cited by 170 publications

References 36 publications

Effect of ultrasonication on physicochemical properties of apple based nanocellulose-calcium carbonate composites

Effect of ultrasonication on physicochemical properties of apple based nanocellulose-calcium carbonate composites

Influence of morphology and dispersion stability of CNC modified with ethylene oxide derivatives on mechanical properties of PLA‐based nanocomposites

Optical Properties of Self‐Assembled Cellulose Nanocrystals Films Suspended at Planar–Symmetrical Interfaces

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