Surface charge density variation to promote structural orientation of cellulose nanocrystals

Cherhal, Fanch; Cathala, Bernard; Capron, Isabelle

doi:10.3183/npprj-2015-30-01-p126-131

Cited by 11 publications

(23 citation statements)

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“…We hypothesize that the presence of RGD on the crystal surface likely enhances crystal-to-crystal association through a combined effect of reduced repulsion and bridging flocculation [38]. A similar side-by-side and end-to-end association has also been reported for sulfated CNC [39], CNCs functionalized with diamines through carbodiimide coupling [40], complementary strands of DNA [15], and polyphosphoesters [41].…”

Section: Figure 4 Cryo-sem Images Of (From Top To Bottom): Pp Dcc2 and Dcc-rgd2 At Lower (Left Column) And Higher (Right Column) Magnificsupporting

confidence: 59%

Self-assembled nanofibrils from RGD-functionalized cellulose nanocrystals to improve the performance of PEI/DNA polyplexes

Manninen

Kling

Wagner

et al. 2019

Journal of Colloid and Interface Science

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Section: Figure 4 Cryo-sem Images Of (From Top To Bottom): Pp Dcc2 and Dcc-rgd2 At Lower (Left Column) And Higher (Right Column) Magnificsupporting

confidence: 59%

Self-assembled nanofibrils from RGD-functionalized cellulose nanocrystals to improve the performance of PEI/DNA polyplexes

Manninen

Kling

Wagner

et al. 2019

Journal of Colloid and Interface Science

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“…No sulfate was detected for the desulfated CNCs based on the absence of a negative slope, indicating no detectable sulfates, although traces of weak acids may be detected by a short delay of the positive slope. 19 Emulsion Preparation. The oil-in-water (o/w) emulsions were prepared using hexadecane and a CNC aqueous suspension at the required concentration without further dilution.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…2,17−19 CNCs are composed of a small number of laterally associated elementary crystallites (3−4 for cotton, 2−3 for Avicel and tunicin), and their thickness is that of one crystallite. 18,19 Their lateral dimensions range from 4 to 20 nm and their length from 100 nm to several micrometers, depending on the source of the cellulose. 10,18 In the case of cotton, average dimensions were recently measured with precision in aqueous suspension by Small Angle Neutron Scattering (SANS) 20 with values of 195 ± 35 nm in length, 22 ± 3 nm in width, and 6 ± 0.2 nm in thickness.…”

Section: ■ Introductionmentioning

confidence: 99%

Structural Description of the Interface of Pickering Emulsions Stabilized by Cellulose Nanocrystals

2016

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The cotton cellulose nanocrystals (CNCs) used in this study are rod-like particles with dimensions in the nanoscale (195 nm long, 23 nm width and 6 nm thick) able to stabilize Pickering emulsions. The adsorption of CNCs at an oil-water interface has been investigated by small angle neutron scattering (SANS) with and without surface charge, and varying CNC concentration from 2 to 5 g/L. Average thicknesses of the interfacial CNC layer around the emulsion droplets of 7 and 18 nm were determined for charged and uncharged CNC, respectively, regardless of their concentration in suspension. This suggests that CNC particles lie as a monolayer varying in surface density. Using several phase contrast variations, the neutron wave vector (Q) dependence with the intensity showed that CNCs are in contact with the oil phase only via the surface of the CNC and not immersed in oil since the Porod behavior is observed over the whole Q-range revealing no deformation of the oil surface at a nanometer scale. This result promotes the postulate that the (2 0 0) crystalline plane of the CNC directly interacts with the interface.

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“…This platform can appear under various more or less sulfated forms depending on the hydrolysis condition. It may even be totally desulfated which leads to more aggregated systems as revealed by visual opacification of the suspension [14,15].…”

Section: Introductionmentioning

confidence: 99%

Some modification of cellulose nanocrystals for functional Pickering emulsions

Saidane¹,

Perrin²,

Cherhal³

et al. 2016

Phil. Trans. R. Soc. A.

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Cellulose nanocrystals (CNCs) are negatively charged colloidal particles well known to form highly stable surfactant-free Pickering emulsions. These particles can vary in surface charge density depending on their preparation by acid hydrolysis or applying post-treatments. CNCs with three different surface charge densities were prepared corresponding to 0.08, 0.16 and 0.64 e nm −2 , respectively. Posttreatment might also increase the surface charge density. The well-known TEMPO-mediated oxidation substitutes C 6 -hydroxyl groups by C 6 -carboxyl groups on the surface. We report that these different modified CNCs lead to stable oil-in-water emulsions. TEMPO-oxidized CNC might be the basis of further modifications. It is shown that they can, for example, lead to hydrophobic CNCs with a simple method using quaternary ammonium salts that allow producing inverse water-in-oil emulsions. Different from CNC modification before emulsification, modification can be carried out on the droplets after emulsification. This way allows preparing functional capsules according to the layer-by-layer process. As a result, it is demonstrated here the large range of use of these biobased rod-like nanoparticles, extending therefore their potential use to highly sophisticated formulations.

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Surface charge density variation to promote structural orientation of cellulose nanocrystals

Cited by 11 publications

References 0 publications

Self-assembled nanofibrils from RGD-functionalized cellulose nanocrystals to improve the performance of PEI/DNA polyplexes

Self-assembled nanofibrils from RGD-functionalized cellulose nanocrystals to improve the performance of PEI/DNA polyplexes

Structural Description of the Interface of Pickering Emulsions Stabilized by Cellulose Nanocrystals

Some modification of cellulose nanocrystals for functional Pickering emulsions

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