References for Pure Organic Liquids

Wohlfarth, Ch.; Wohlfahrt, B.

doi:10.1007/10639283_34

Cited by 6 publications

(4 citation statements)

References 1,129 publications

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“…The layers 3-5 of n-hexadecane liquid were incorporated into the middle layer. The solid line which indicates the viscosity of the bulk n-hexadecane (∼ 3.0 mPa·s at 300 K) [62] is displayed for comparison.…”

Section: Shear-thinning Of the Individual Liquid Layermentioning

confidence: 99%

The unique properties of the solid-like confined liquid films: A large scale molecular dynamics simulation approach

Wang

Zhao

2011

Acta Mechanica Solida Sinica

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The properties of the confined liquid are dramatically different from those of the bulk state, which were reviewed in the present work. We performed large-scale molecular dynamics simulations and full-atom nonequilibrium molecular dynamics simulations to investigate the shear response of the confined simple liquid as well as the n-hexadecane ultrathin films. The shear viscosity of the confined simple liquid increases with the decrease of the film thickness. Apart from the well-known ordered structure, the confined n-hexadecane exhibited a transition from 7 layers to 6 in our simulations while undergoing an increasing shear velocity. Various slip regimes of the confined n-hexadecane were obtained. Viscosity coefficients of individual layers were examined and the results revealed that the local viscosity coefficient varies with the distance from the wall. The individual n-hexadecane layers showed the shear-thinning behaviors which can be correlated with the occurrence of the slip. This study aimed at elucidating the detailed shear response of the confined liquid and may be used in the design and application of micro-and nano-devices.

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Section: Shear-thinning Of the Individual Liquid Layermentioning

confidence: 99%

The unique properties of the solid-like confined liquid films: A large scale molecular dynamics simulation approach

Wang

Zhao

2011

Acta Mechanica Solida Sinica

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“…Next, in Figure , the fits of the extensive literature data on dynamic viscosities of n -BuOH and t -BuOH in terms of the power-law (PL) formula are presented. This originally empirical expression , was later justified through the mode coupling theory (MCT) of dynamics of the supercooled and normal liquid states. − Here, η ∞ is the pre-exponential factor, T X VISC is the characteristic dynamic VISC temperature or the so-called critical MCT temperature T c , and μ is a nonuniversal coefficient.…”

Section: Resultsmentioning

confidence: 99%

“…Power-law (PL) fit of viscosity vs T data for bulk n -BuOH (red) and t -BuOH (green) within the liquid state between the melting temperature T m and the boiling temperature T b with the characteristic VISC temperatures: T X VISC = 142 and 261 K close to T X2 slow ∼ 140 K or T X1 fast ∼ 260 K, respectively.…”

Section: Resultsmentioning

confidence: 99%

Confined Effects on Structural Isomers in the MCM-41-SIL Matrix as Seen by Extrinsic Probes via PALS and ESR: n-Butanol vs tert-Butanol

et al. 2021

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The structural–dynamic states of n-butanol (n-BuOH) and tert-butanol (t-BuOH) isomers as representatives of a linear or globular protic polar medium in the bulk and confined states in the Mobile Composition Matter-41 (MCM-41) matrix obtained from the free volume and phase behavior using positron annihilation lifetime spectroscopy (PALS) or differential scanning calorimetry (DSC), respectively, together with the spectral properties and related mobility and interaction of the spin probe (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) using electron spin resonance (ESR), are presented. In the bulk t-BuOH, the typical τ3 vs T response for strongly crystallizing globular organics with a stepwise effect in the vicinity of T m is found. On the other hand, the bulk n-BuOH exhibits a complicated course depending on thermal cycling due to the distinct crystallization ability of the linear constituents due to their intermolecular H-bonding. Under confinement, both n-BuOH and t-BuOH media in the MCM-41-SIL matrix were amorphized and heterogenized with larger mean free volume sizes and strong broadening of their dispersion with respect to the corresponding bulk states. In addition, very distinct temperature dependences in τ3 vs T/T g plots with some anomalous effect in the subplateau region in the linear isomer correlating with the DSC response are observed. In the ESR experiment, a drastic difference in the most pronounced characteristic ESR temperature marking a transition from the slow-to-fast-motion regime with the following relations was found: T 50G(b) ≅ T m DSC(b) for n-BuOH against T 50G(b) ≪ T m DSC(b) for t-BuOH, where T m DSC(b) is the respective melting point. Further, several changes in the TEMPO mobility in both BuOH media are related to the numerous dynamic and thermodynamic transitions as obtained from measured DSC, PALS, and literary viscosity data. Finally, the changes in hyperfine splitting constants of TEMPO sensitively reflect the altered structural–dynamic relationships in both confined BuOH isomers with close coincidences between all three characteristic PALS and ESR temperatures, indicating the same origin of the underlying processes behind the changes in spin probe mobility or free volume expansion.

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“…Recently, it is found that ionic thermoelectric (i‐TE) systems can generate much higher thermoelectric potentials (usually at the millivolt level) than conventional semiconducting thermoelectric materials due to the thermal diffusion effect of ions, which is known as the Soret effect. [ 10,11 ] Some aqueous salt solutions, such as LiCl, or NaCl, show Seebeck coefficients of 0.5–0.8 mV K −1 , [ 12 ] the dispersion of NaOH in liquid poly (ethylene oxide) (PEO‐NaOH) [ 13 ] shows a high Seebeck coefficient was up to 11 mV K −1 . Studies on liquid thermocells with redox couple I − /I 3− , or [Fe(CN) 6 ] 3− /[Fe(CN) 6 ] 4− have also made significant progress, [ 14,15 ] however, such thermocells still face many challenges associated with liquid leakage and non‐stretchability.…”

Section: Introductionmentioning

confidence: 99%

Highly Stretchable, Resilient, Adhesive, and Self‐Healing Ionic Hydrogels for Thermoelectric Application

Fu,

Sun,

Liu

et al. 2023

Adv Funct Materials

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Harvesting low‐grade waste heat from the natural environment with thermoelectric materials is considered as a promising solution for the sustainable energy supply for wearable electronic devices. For practical applications, it is desirable to endow the thermoelectric materials with excellent mechanical and self‐healing properties, which remains a great challenge. Herein, the design and characterization of a series of high‐performance ionic hydrogels for soft thermoelectric generator applications are reported. Composed of a physically cross‐linked network of polyacrylic acid (PAA) and polyethylene glycol (PEO) doped with sodium chloride, the resulting PAA‐PEO‐NaCl ionic hydrogels demonstrates impressive mechanical strength (breaking stress >1.3 MPa), stretchability (>1100%), and toughness (up to 7.34 MJ m−3). Moreover, the reversible hydrogen bonding interaction and chain entanglement render the ionic hydrogels with excellent mechanical resilience, adhesion properties, and self‐healing properties. At ambient conditions, the electrochemical and thermoelectric performance of the ionic hydrogels can be restored immediately from physical damage such as cutting, and the mechanical healing can be completely restored within 24 h. At the optimized composition, the Seebeck coefficient of the ionic hydrogels can reach 3.26 mV K−1 with a low thermal conductivity of 0.321 W m−1 K−1. Considering the excellent mechanical properties and thermoelectric performance, it is believed that the ionic hydrogels are widely applicable in ionic thermoelectric capacitors to convert low‐grade heat into electricity for soft electronic devices.

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References for Pure Organic Liquids

Cited by 6 publications

References 1,129 publications

The unique properties of the solid-like confined liquid films: A large scale molecular dynamics simulation approach

The unique properties of the solid-like confined liquid films: A large scale molecular dynamics simulation approach

Confined Effects on Structural Isomers in the MCM-41-SIL Matrix as Seen by Extrinsic Probes via PALS and ESR: n-Butanol vs tert-Butanol

Highly Stretchable, Resilient, Adhesive, and Self‐Healing Ionic Hydrogels for Thermoelectric Application

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