Identification of Shear Elasticity at Low Frequency in Liquid n-Heptadecane, Liquid Water and RT-Ionic Liquids [emim][Tf2N]

Noirez, Laurence; Baroni, Patrick; Cao, Hongli

doi:10.1016/j.molliq.2012.05.011

Cited by 16 publications

(27 citation statements)

References 40 publications

(53 reference statements)

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“…KAHL, P. BARONI, AND L. NOIREZ PHYSICAL REVIEW E 88, 050501(R) (2013) We interpret the results in favor of long range intermolecular effects leading to the conclusion that the isotropic phase is a fragile, long range, elastically correlated "self-assembly." The strength of the solidlike response depends on the architecture of the molecule (polymer or not) and likely on the nature of the intermolecular interactions (van der Waals, H-bond, polar), in agreement with results obtained on other materials [19,20].…”

Section: Rapid Communicationssupporting

confidence: 88%

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Hidden solidlike properties in the isotropic phase of the 8CB liquid crystal

2013

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Novel dynamic experiments have enabled the identification of a macroscopic solidlike response in the isotropic phase of a low molecular weight liquid crystal, 4,4'-n-octylcyanobiphenyl (8CB). This unknown property indicates that the low frequency shear elasticity identified in the isotropic phase of liquid crystal polymers is not reminiscent from the glass transition but reveals likely a generic property of the liquid state. The comparison to high molecular weight liquid crystals indicates, however, that the shear modulus is much enhanced when the liquid crystal moieties are attached to a polymer chain. The macroscopic length scales probed (0.050-0.100 mm) exclude wall-induced effects.

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Section: Rapid Communicationssupporting

confidence: 88%

“…This analysis and the fact that for other liquids, a low frequency shear elasticity was detected [19,20], support the assumption that we deal with a generic property of the liquid state. We therefore interpret the low frequency shear elasticity as a measurement of the strength of long range intermolecular interactions.…”

Section: Rapid Communicationssupporting

confidence: 78%

Hidden solidlike properties in the isotropic phase of the 8CB liquid crystal

2013

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“…The use of strongly interacting surface to characterize the dynamic behavior of surfactant solution (Fig. 7b) indicates a low frequency elastic-like behavior (shear modulus and viscous modulus are independent of the frequency with G 0 > G 00 ), and thus long range elastic correlations in agreement with what was found on various liquids including ionic liquids, alkanes, liquid water [15,19,24]. Schemes of the sin strain input wave ( 3 ) and shear stress output response (red 3 ) (the dotted line represents the p/4 phase shift output wave (---)), and corresponding low frequency dynamic spectra (logarithmic representation).…”

Section: The Key Role Of the Surface In Dynamic Relaxation Measurementssupporting

confidence: 73%

Importance of Interfacial Interactions to Access Shear Elasticity of Liquids and Understand Flow Induced Birefringence from Liquid Crystals to Worm-Like Micellar Solutions

Noirez

2017

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-This work points out the importance of the substrate boundary conditions to lower the dissipation in the dynamic measurement and access the closest dynamic characteristics of liquids, in particular to access the low frequency shear elasticity. The liquid/surface interface is a source of dissipation that enters and impacts the measurement. Examples of steady-state shear flows or flow birefringence are presented to highlight the non-universality of the behavior with respect to the nature of the substrate or the sheared thickness. Additionally the present development completes and extends the identification of low frequency shear elasticity made at sub-millimeter gaps in various one-component liquids to salt-free aqueous solutions (CTAB-water (Hexadecyl-TrimethylAmmonium Bromide)).Résumé -Importance des interactions interfaciales pour accéder à l'élasticité de cisaillement des liquides et comprendre la biréfringence d'écoulement des cristaux liquides aux solutions micellaires -Nous montrons par une approche expérimentale, l'importance de l'interaction liquide/substrat (mouillage) pour diminuer la dissipation et améliorer la mesure dynamique, en particulier pour accéder à l'élasticité de cisaillement à basse fréquence peu accessible par la mesure viscoélastique conventionnelle. L'interface liquide/surface est une source de dissipation qui a un impact dans la mesure. À titre d'exemple, des mesures d'écoulement en cisaillement continu ou de biréfringence d'écoulement sont présentées pour mettre en évidence la non-universalité du comportement par rapport à la nature du substrat ou à l'épaisseur cisaillée. Enfin, nous étendons la mesure de l'élasticité de cisaillement basse fréquence réalisée à l'échelle sub-millimétrique dans les liquides purs à des solutions lyotropes de micelles géantes (CTAB-water (HexadecylTrimethylAmmonium Bromide)).

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“…These electrostatic interactions between molecules provide the liquid cohesion. The dynamic behavior of surfactant solution (Figure 7b) is in agreement with what was found on various liquids, including ionic liquids, alkanes, and liquid water [47,50]. This was obtained by strongly interacting surfaces to optimize the stress transmission (see Section 6.…”

Section: Conventional Rheologysupporting

confidence: 83%

“…At larger scales and lower frequency, Collin et al reported, using treated glass surfaces and small strains delivered by a piezorheometer, a gel-like response of up to 50-µm thicknesses in a low molecular weight polystyrene melt that was interpreted as reminiscent of the glass transition, i.e., clusters of finite size [43]. Since 2006, with the consideration of the wetting conditions to the substrate (paragraph 6), decisive steps have been taken for easy access to shear elasticity, generalizing its identification to a wide panel of liquids and elucidating its intermolecular interaction origin as a condensed matter property [44][45][46][47][48][49][50][51][52][53][54].…”

Section: Mechanical Response Of Lc and Lcps In The Isotropic Phasementioning

confidence: 99%

Exploring “Dormant” Opto-Mechanical Properties of the Isotropic Phase of Liquid Crystals and Revealing Hidden Elasticity of (Ordinary) Liquids

Noirez

Kahl

2018

Fluids

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There is little literature on the flow properties of the isotropic phase of liquid crystalline fluids. However, this phase is an ideal tool to bridge the physics of liquid crystals with those of (ordinary) fluids. Optical and mechanical studies are presented, demonstrating that away from any phase transition, the isotropic phase of liquid crystalline molecules (LCs) and liquid crystalline polymers (LCPs) can work as an optical oscillator in response to low-frequency mechanical excitation, establishing the elastic origin of the flow birefringence and "visualizing" the very existence of the elastic nature of the liquid state. Additionally, mimicking the excellent anchoring ability of liquid crystals, an alternative rheological protocol optimizing the fluid/substrate interfaces is presented to access the low-frequency shear elasticity in various one-component liquids and salt-free aqueous solutions.

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Identification of Shear Elasticity at Low Frequency in Liquid n-Heptadecane, Liquid Water and RT-Ionic Liquids [emim][Tf2N]

Cited by 16 publications

References 40 publications

Hidden solidlike properties in the isotropic phase of the 8CB liquid crystal

Hidden solidlike properties in the isotropic phase of the 8CB liquid crystal

Importance of Interfacial Interactions to Access Shear Elasticity of Liquids and Understand Flow Induced Birefringence from Liquid Crystals to Worm-Like Micellar Solutions

Exploring “Dormant” Opto-Mechanical Properties of the Isotropic Phase of Liquid Crystals and Revealing Hidden Elasticity of (Ordinary) Liquids

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