Rheology and microstructure of aqueous suspensions of nanocrystalline cellulose rods

Xu, Yuan; Atrens, Aleks D.; Stokes, Jason R.

doi:10.1016/j.jcis.2017.02.020

Cited by 73 publications

(72 citation statements)

References 55 publications

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“…High nanoparticle concentrations and therefore increased viscosities further facilitated good spreadability of the nanoparticle dispersions on the substrates. In particular, the presence of ions induced the gel-like character of the CNC dispersion [58]. The dry coating thicknesses of both CNC and SNP coatings exceeded the targeted values on PLA.…”

Section: Nanoparticle Coatingsmentioning

confidence: 93%

Efficiently Extracted Cellulose Nanocrystals and Starch Nanoparticles and Techno-Functional Properties of Films Made Thereof

et al. 2018

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Cellulose nanocrystals (CNC) and starch nanoparticles (SNP) have remarkable physical and mechanical characteristics. These properties particularly facilitate their application as high-performance components of bio-based packaging films as alternatives to fossil-based counterparts. This study demonstrates a time-efficient and resource-saving extraction process of CNC and SNP by sulfuric acid hydrolysis and neutralization. The yields of the hydrolyzed products were 41.4% (CNC) and 32.2% (SNP) after hydrolysis times of 3 h and 120 h, respectively. The nanoparticle dispersions were wet-coated onto poly(lactic acid) (PLA) and paper substrates and were incorporated into starch films. No purification or functionalization of the nanoparticles was performed prior to their application. Techno-functional properties such as the permeability of oxygen and water vapor were determined. The oxygen permeability of 5–9 cm3 (STP) 100 µm m−2 d−1 bar−1 at 50% relative humidity and 23 °C on PLA makes the coatings suitable as oxygen barriers. The method used for the extraction of CNC and SNP contributes to the economic production of these nanomaterials. Further improvements, e.g., lower ion concentration and narrower particle size distribution, to achieve reproducible techno-functional properties are tangible.

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Section: Nanoparticle Coatingsmentioning

confidence: 93%

Efficiently Extracted Cellulose Nanocrystals and Starch Nanoparticles and Techno-Functional Properties of Films Made Thereof

et al. 2018

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“…Effects of monovalent ions on the rheology of nanocellulose and related suspensions have been widely reported (Kratohvil et al 1969;Ono et al 2004;Agoda-Tandjawa et al 2010, 2012Lu et al 2014a;Moberg et al 2014;Shafiei-Sabet et al 2014;Qi et al 2015;Sim et al 2015;Beck and Bouchard 2016;Qiao et al 2016;Tanaka et al 2016;Xu et al 2017). Such effects have been attributed, in many cases, to induced aggregation among the suspended particles above a critical concentration of the ions (Fukuzumi et al 2014;Lu et al 2014a).…”

Section: Rapid Collisions and Sticking Of Fibrilsmentioning

confidence: 99%

Rheology of nanocellulose-rich aqueous suspensions: A Review

Hubbe

Tayeb

Joyce

et al. 2017

BioRes

212

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The flow characteristics of dilute aqueous suspensions of cellulose nanocrystals (CNC), nanofibrillated cellulose (NFC), and related products in dilute aqueous suspensions could be of great importance for many emerging applications. This review article considers publications dealing with the rheology of nanocellulose aqueous suspensions in the absence of matrix materials. In other words, the focus is on systems in which the cellulosic particles themselves – dependent on their morphology and the interactive forces between them – largely govern the observed rheological effects. Substantial progress in understanding rheological phenomena is evident in the large volume of recent publications dealing with such issues including the effects of flow history, stratification of solid and fluid layers during testing, entanglement of nanocellulose particles, and the variation of inter-particle forces by changing the pH or salt concentrations, among other factors. Better quantification of particle shape and particle-to-particle interactions may provide advances in future understanding. Despite the very complex morphology of highly fibrillated cellulosic nanomaterials, progress is being made in understanding their rheology, which supports their usage in applications such as coating, thickening, and 3D printing.

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“…The distinctly polar surface of cellulose complicates processing of nanocellulose with non-polar solvents and polymers [12], necessitating chemical surface modification [13] or other measures to improve compatibility. The high specific surface area of nanocellulose greatly increases the viscosity of liquids even at small concentrations of a few percent [14,15,16]. Due to its promising properties in combination with green features, such as renewability and biodegradability, nanocellulose is being intensely studied with regard to a very broad variety of applications, such as packaging [17,18], foams [19,20], water purification [21,22], spun fibers [23], and reinforced polymers [24].…”

Section: Introductionmentioning

confidence: 99%

Simple Green Route to Performance Improvement of Fully Bio-Based Linseed Oil Coating Using Nanofibrillated Cellulose

et al. 2017

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Due to their bio-based character, oil-based coatings become more and more prevalent in wood surface finishing. These coatings impart appealing optical and haptic properties to the wood surface, but lack sufficient protection against water and mechanical influences. The present study reports a simple green route to improve the performance of linseed oil coating by the addition of nanofibrillated cellulose (NFC). In order to achieve surface chemical compatibility with linseed oil, NFC was chemically modified with acetic anhydride and (2-dodecen-1-yl)succinic anhydride, respectively, using propylene carbonate as a solvent. NFC/linseed oil formulations were prepared and applied to wood substrates. The wear resistance of oil-coated wood surfaces was assessed by a newly developed test combining abrasive loading with subsequent contact angle measurement. As revealed by infrared and nuclear magnetic resonance (NMR) spectroscopy, as well as X-ray diffraction (XRD), NFC has been successfully modified without significantly affecting the structure of cellulose. In abrasion tests, all NFC-modified oil coatings performed better than the original oil. Interestingly, NFC only suspended in propylene carbonate, i.e., without chemical modification, had the strongest improvement effect on the coating's wear resistance. This was primarily attributed to the loose network structure of this NFC variant which effectively prevents the oil from penetration into the wood surface, thus forming a protective NFC/oil composite layer on the wood surface.

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Rheology and microstructure of aqueous suspensions of nanocrystalline cellulose rods

Cited by 73 publications

References 55 publications

Efficiently Extracted Cellulose Nanocrystals and Starch Nanoparticles and Techno-Functional Properties of Films Made Thereof

Efficiently Extracted Cellulose Nanocrystals and Starch Nanoparticles and Techno-Functional Properties of Films Made Thereof

Rheology of nanocellulose-rich aqueous suspensions: A Review

Simple Green Route to Performance Improvement of Fully Bio-Based Linseed Oil Coating Using Nanofibrillated Cellulose

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