The role of hydrogen bonding in non-ionic polymer adsorption to cellulose nanocrystals and silica colloids

Reid, Michael S.; Villalobos, Marco; Cranston, Emily D.

doi:10.1016/j.cocis.2017.03.005

Cited by 57 publications

(44 citation statements)

References 89 publications

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“…For instance the mechanism of adsorption of XG on CNCs layer has been studied in our group using quartz crystal microbalance with dissipation technique [17][18][19]21]. XG adsorbs instantaneously and irreversibly on cellulose nanocrystals, this adsorption is thought to be driven by an entropically and kinetically process [15,36].Thus in the case of CNC/XG hydrogel, depletion cannot be retained as first hypothesis of the gelation mechanism. Dammak et al reported that, for a high molar mass XG, saturation coverage of cotton CNC soccurs at c.a.…”

Section: Discussionmentioning

confidence: 99%

Influence of Xyloglucan Molar Mass on Rheological Properties of Cellulose Nanocrystal/Xyloglucan Hydrogels

Talantikite¹,

Gourlay²,

Gall³

et al. 2019

Journal of Renewable Materials

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Plant components are an inexhaustible source for the construction of bio-based materials. Here we report, for the first time, the elaboration of biobased cellulose nanocrystals (CNC)/xyloglucan (XG) hydrogels. XG is a hemicellulose displaying a great affinity for cellulose surface and can be thus irreversibly adsorbed on CNC. Properties of the hydrogels were investigated by varying the molar mass of XG either by enzymatic treatment with Endoglucanase (EG2) or physical fractionation by ultrasound (US). Fractions were characterised by high-performance size exclusion chromatography (HPSEC) and their monosacchari decompositions were determined. Three fractions with high, average and small molar mass, (800, 300 and 100 10 3 g/mol respectively), were selected in order to tune the properties of the hydrogel. Sol-gel transition conditions were determined for each fraction by achieving phase diagram using the inverted tube method. Mechanical properties, assessed by rheology, are improved by increasing XG molar mass since elastic modulus is higher for hydrogels formed with higher molar mass fractions as well as the strain at break. Gel formation is likely due to the adsorption of XG fractions on CNC which increases the effective hydrodynamic volume of CNC leading to steric stabilization and interactions between loops and tails of XG adsorbed.

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Section: Discussionmentioning

confidence: 99%

Influence of Xyloglucan Molar Mass on Rheological Properties of Cellulose Nanocrystal/Xyloglucan Hydrogels

Talantikite¹,

Gourlay²,

Gall³

et al. 2019

Journal of Renewable Materials

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“…58 While hydrogen bonding plays a significant role in cellulosic material behavior, we highlight that in the presence of water, hydrogen bonding is primarily between water and CNMs, and that strong cellulose-cellulose hydrogen bonds only form after complete dehydration. 44,59 For CNCs it is common to freeze dry them for storage or incorporation into other materials and it is recommended to freeze dry from well-dispersed sodium-salt form suspensions at low concentrations (0.5 -3 wt.%). 60 The resulting product should be a loosely packed aerogel however, depending on CNC concentration and freezing method/rate, freeze dried CNCs can be denser, flake-like structures.…”

Section: Drying Cnms To Be Redispersiblementioning

confidence: 99%

Current characterization methods for cellulose nanomaterials

et al. 2018

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A new family of materials comprised of cellulose, cellulose nanomaterials (CNMs), having properties and functionalities distinct from molecular cellulose and wood pulp, is being developed for applications that were once thought impossible for cellulosic materials. Commercialization, paralleled by research in this field, is fueled by the unique combination of characteristics, such as high on-axis stiffness, sustainability, scalability, and mechanical reinforcement of a wide variety of materials, leading to their utility across a broad spectrum of high-performance material applications. However, with this exponential growth in interest/activity, the development of measurement protocols necessary for consistent, reliable and accurate materials characterization has been outpaced. These protocols, developed in the broader research community, are critical for the advancement in understanding, process optimization, and utilization of CNMs in materials development. This review establishes detailed best practices, methods and techniques for characterizing CNM particle morphology, surface chemistry, surface charge, purity, crystallinity, rheological properties, mechanical properties, and toxicity for two distinct forms of CNMs: cellulose nanocrystals and cellulose nanofibrils.

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“…NC can also stablish hydrogen bonding with PVOH fibers to form a composite PVOH/NC with better mechanical properties [105]. There are strong interactions between hydroxyl groups of PVOH and carboxylic groups at the NC surface, which lead to the formation of a rigid network, resulting in improved mechanical properties of the PVOH fibers [106,107]. PVOH fibers could be covered with NC before being added to the mixture and this could increase their interaction with the matrix.…”

Section: Nanocelluloses In the Cement And Fiber-cement Industrymentioning

confidence: 99%

“…The high interaction of NC with the cellulosic fibers and matrix would improve the retention of silica fume in fiber cement. The same can be said for metakaolin, although the particle size of metakaolin is smaller than that of cement particles, and it is not as fine as silica fume; thus, it is easier to retain [68,106].…”

Section: Nanocelluloses In the Cement And Fiber-cement Industrymentioning

confidence: 99%

Nanocelluloses: Natural-Based Materials for Fiber-Reinforced Cement Composites. A Critical Review

et al. 2019

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Nanocelluloses (NCs) are bio-based nano-structurated products that open up new solutions for natural material sciences. Although a high number of papers have described their production, properties, and potential applications in multiple industrial sectors, no review to date has focused on their possible use in cementitious composites, which is the aim of this review. It describes how they could be applied in the manufacturing process as a raw material or an additive. NCs improve mechanical properties (internal bonding strength, modulus of elasticity (MOE), and modulus of rupture (MOR)), alter the rheology of the cement paste, and affect the physical properties of cements/cementitious composites. Additionally, the interactions between NCs and the other components of the fiber cement matrix are analyzed. The final result depends on many factors, such as the NC type, the dosage addition mode, the dispersion, the matrix type, and the curing process. However, all of these factors have not been studied in full so far. This review has also identified a number of unexplored areas of great potential for future research in relation to NC applications for fiber-reinforced cement composites, which will include their use as a surface treatment agent, an anionic flocculant, or an additive for wastewater treatment. Although NCs remain expensive, the market perspective is very promising.

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The role of hydrogen bonding in non-ionic polymer adsorption to cellulose nanocrystals and silica colloids

Cited by 57 publications

References 89 publications

Influence of Xyloglucan Molar Mass on Rheological Properties of Cellulose Nanocrystal/Xyloglucan Hydrogels

Influence of Xyloglucan Molar Mass on Rheological Properties of Cellulose Nanocrystal/Xyloglucan Hydrogels

Current characterization methods for cellulose nanomaterials

Nanocelluloses: Natural-Based Materials for Fiber-Reinforced Cement Composites. A Critical Review

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