The cation-controlled and hydrogen bond-mediated shear-thickening behaviour of a tree-fern isolated polysaccharide

Wee, May Sui Mei; Matía-Merino, Lara; Goh, Kelvin K.T.

doi:10.1016/j.carbpol.2015.03.086

Cited by 16 publications

(6 citation statements)

References 51 publications

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“…The presence of these peculiar “extendable” H-bonds is most probably related to the unusual elasticity of escin adsorption layers registered experimentally . This statement is in agreement with our previous study at low coverage, where this interaction was identified first, and also with investigations of other elastic systems described in the Introduction. − …”

Section: Resultssupporting

confidence: 91%

“…They found that intermolecular hydrogen bonding was the source of the shear thickening. Wee et al showed dependence between the magnitude of shear thickening (from 5 to 20 s –1 ) of the same viscoelastic resin and the amount of salt present. They assumed that the shear thickening mechanism was related to a shear-deformation-induced transition from intra- to intermolecular hydrogen bonding facilitated by the screening effect of cations.…”

Section: Introductionmentioning

confidence: 99%

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Structure of Dense Adsorption Layers of Escin at the Air–Water Interface Studied by Molecular Dynamics Simulations

2019

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Saponins are natural surfactants with high surface activity and unique surface properties. Escin is a triterpenoid saponin which has unusually high surface viscoelasticity [Golemanov et al. Sof t Matter 2013, 9, 5738] and low permittivity to molecular gas diffusion of its adsorption layers. In our previous study [Tsibranska et al. Langmuir 2017, 33, 8330], we investigated the molecular origin of this unconventional behavior and found that escin molecules rapidly assemble in a compact and stable surface cluster. This behavior was explained with long-range attraction between the hydrophobic aglycones combined with intermediate dipole−dipole attraction and strong short-range hydrogen bonds between the sugar residues in the adsorbed escin molecules. In this study, we performed atomistic molecular simulations of escin molecules in dense adsorption layers with two different areas per molecule. The results show that the surfactant molecules in these systems are much less submerged in water and adopt a more upright position compared to the dilute layers studied previously. A significant number of trapped water molecules are located around the hydrophilic groups placed above the water equimolecular surface to solvate them in the dense layer. To maintain the preferred orientation of the escin molecules with respect to the interface, the most compact adsorption layer acquires a significant spontaneous curvature. The substantial elasticity of the neutral escin layers, as in our previous study, is explained with the presence of a specific interaction, which is intermediate between hydrogen bonding and dipole−dipole attraction (populated lengths in the range 0.16 to >0.35 nm), supplemented by substantial flexibility of the surfactant heads, optimal curvature of the interface, and significant normal displacement of the molecules to allow their tight surface packing. The simulations reveal long-range order within the layers, which signifies the role of the collective behavior of the saponin molecules in such dense adsorption layers.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Structure of Dense Adsorption Layers of Escin at the Air–Water Interface Studied by Molecular Dynamics Simulations

2019

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“…(Rodriquez‐Rivero et al , ). They are also rare examples of biopolymers exhibiting shear thickening properties, that is the Newtonian plateau is followed by an increase of viscosity (Wee et al , ). Several models have been developed for describing flow behaviour.…”

Section: Shear and Extensional Rheologymentioning

confidence: 99%

Shear and extensional rheology of selected polysaccharides

Evageliou

2020

Int J of Food Sci Tech

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Rheology is used for the elucidation of the flow properties of polysaccharide solutions. For a given polysaccharide, both shear and extensional rheological experiments should be performed for the full characterisation of its flow properties. The provided information will facilitate the efficient exploitation of a polysaccharide in various applications. Although shear rheology is widely used in polysaccharides' characterisation, there are only limited extensional rheology studies due to lack of reliable techniques in the formation of pure extensional flow. However, recently, several commercial extensional rheometers have been developed and thus, accurate extensional experiments can now be performed. The present work initially presents the principles and concepts of both shear and extensional rheology and then reports rheological findings for solutions of various polysaccharides and their derivatives. Xanthan and various members of the galactomannan, cellulose and alginate families were selected.

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“…The rheological properties of polysaccharides are generally affected by its primary structure and conformation. Pectin exhibits more complex rheological behavior than neutral polysaccharides, because the addition of salt can change its chain conformation and interactions ( Wee, Matia-Merino, & Goh, 2015 ). In this work, steady-shear rheological properties of pectin in water or NaNO 3 solutions with different concentrations were studied as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Chain conformations and steady-shear viscosity properties of pectic polysaccharides from apple and tomato

Wang

Nie

et al. 2022

Food Chemistry: X

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The cation-controlled and hydrogen bond-mediated shear-thickening behaviour of a tree-fern isolated polysaccharide

Cited by 16 publications

References 51 publications

Structure of Dense Adsorption Layers of Escin at the Air–Water Interface Studied by Molecular Dynamics Simulations

Structure of Dense Adsorption Layers of Escin at the Air–Water Interface Studied by Molecular Dynamics Simulations

Shear and extensional rheology of selected polysaccharides

Chain conformations and steady-shear viscosity properties of pectic polysaccharides from apple and tomato

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