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Thermophysical Properties

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https://read.qxmd.com/read/30874131/thermomechanical-response-of-copper-films-irradiated-by-femtosecond-pulsed-lasers-with-dynamic-optical-properties
#1
Yunpeng Ren, Kai Qin, Yan Chen, Qing Lin, Dongyang Xu, Zhiduo Xin, Jian Ni, Liang Ge
By taking into account the dynamic thermophysical and optical properties, the ultrafast thermoelastic response of thin copper film irradiated by femtosecond lasers has been researched. The temperature and stress fields of copper film irradiated by femtosecond lasers are analyzed in this work. The simulation results reveal that the degree of thermomechanical response is much underestimated, especially with higher laser fluence and smaller pulse duration. It is necessary to employ dynamic properties in ultrafast thermoelastic simulation for accuracy...
February 1, 2019: Applied Optics
https://read.qxmd.com/read/30850519/light-triggered-thermal-conductivity-switching-in-azobenzene-polymers
#2
Jungwoo Shin, Jaeuk Sung, Minjee Kang, Xu Xie, Byeongdu Lee, Kyung Min Lee, Timothy J White, Cecilia Leal, Nancy R Sottos, Paul V Braun, David G Cahill
Materials that can be switched between low and high thermal conductivity states would advance the control and conversion of thermal energy. Employing in situ time-domain thermoreflectance (TDTR) and in situ synchrotron X-ray scattering, we report a reversible, light-responsive azobenzene polymer that switches between high (0.35 W m-1 K-1 ) and low thermal conductivity (0.10 W m-1 K-1 ) states. This threefold change in the thermal conductivity is achieved by modulation of chain alignment resulted from the conformational transition between planar ( trans ) and nonplanar ( cis ) azobenzene groups under UV and green light illumination...
March 8, 2019: Proceedings of the National Academy of Sciences of the United States of America
https://read.qxmd.com/read/30840001/thermophysical-properties-of-glyceline-water-mixtures-investigated-by-molecular-modelling
#3
Jörg Baz, Christoph Held, Jürgen Pleiss, Niels Hansen
The effect of water content on the static and dynamic properties of the deep eutectic solvent glyceline is studied using molecular dynamics (MD) simulations. Static properties are additionally calculated using the PC-SAFT equation of state. Force fields calibrated on water-free glyceline show predictive power for density and water activity over the entire composition range. In contrast, the PC-SAFT approach using pseudo one-component or two-component modelling strategies performed better for the density or the water activity, respectively...
March 6, 2019: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/30838371/insights-into-the-influence-of-the-molecular-structures-of-fluorinated-ionic-liquids-on-their-thermophysical-properties-a-soft-saft-based-approach
#4
Margarida L Ferreira, João M M Araújo, Ana B Pereiro, Lourdes F Vega
Fluorinated ionic liquids (FILs) are a unique family of ionic liquids with remarkable properties, including the formation of three nano-segregated domains, which are very attractive for several emerging applications. However, the amount of available experimental data to fully characterize them is very scarce. We propose a systematic methodology to build FIL transferable molecular models within the soft-SAFT framework to describe the behaviour of FILs and their mixtures. A total of 38 FILs (pyridinium- and imidazolium-based FILs conjugated with fluorinated anions such as [N(CF3SO2)2]-, [CF3SO3]-, [CF3CO2]-, [C4F9SO3]- and [C4F9CO2]-) have been modelled for this purpose using available data, paying special attention to the physical meaning of the parameters...
March 6, 2019: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/30811105/in-the-quest-for-green-solvents-design-from-hydrophilic-to-hydrophobic-deep-eutectic-solvents
#5
Isabel Maria Marrucho, Catarina Florindo, Luís C Branco
Deep eutectic solvents (DESs) consist of a mixture of two or more solid components leading to a drop of the melting point of the mixture when compared to the starting materials. Until recently, only hydrophilic DESs were available, and despite their revolutionary role in the alternative solvents scenario, important issues in chemistry and chemical engineering, such as water related problems or the replacement of toxic volatile organic compounds, could not be tackled. Hydrophobic (Deep) - here in parenthesis due to the different depths of the eutectic´s melting points - Eutectic Solvents are a sub-class of DESs where both components are hydrophobic...
February 27, 2019: ChemSusChem
https://read.qxmd.com/read/30769850/numerical-analysis-of-curing-residual-stress-and-deformation-in-thermosetting-composite-laminates-with-comparison-between-different-constitutive-models
#6
Jianfeng Dai, Shangbin Xi, Dongna Li
A multi-physics coupling numerical model of the curing process is proposed for the thermosetting resin composites in this paper, and the modified "cure hardening instantaneously linear elastic (CHILE)" model and viscoelastic model are adopted to forecast residual stress and deformation during the curing process. The thermophysical properties of both models are evolved in line with temperature and degree of cure (DOC). Accordingly, the numerical simulation results are improved to be more accurate. Additionally, the elastic modulus of the materials is calibrated to be equal to the modulus of viscoelastic relaxation by a defined function of time in the CHILE model...
February 14, 2019: Materials
https://read.qxmd.com/read/30709210/temperature-gradients-for-thermophysical-and-thermochemical-property-measurements-to-3000-%C3%A2-c-for-an-aerodynamically-levitated-spheroid
#7
Scott J McCormack, Anthony Tamalonis, Richard J K Weber, Waltraud M Kriven
This study examines thermal gradients in ceramic oxide spheroids being aerodynamically levitated in a conical nozzle levitator (CNL) system equipped with a CO2 laser (10.6 µm wavelength). The CNL system is a versatile piece of equipment that can easily be coupled with advanced thermophysical and thermochemical measuring devices, such as diffraction/scattering (X-ray and neutron), nuclear magnetic resonance, and calorimetry, for the analysis of bulk spheroidal solids and liquids. The thermal gradients of a series of single crystal, polycrystalline solids, and liquid spheroids have been measured spatially in the CNL system, by means of a disappearing filament pyrometer (800-3000 °C) and by X-ray diffraction with reference to an internal standard (Pt: 800-1600 °C)...
January 2019: Review of Scientific Instruments
https://read.qxmd.com/read/30624899/droplet-jumping-effects-of-droplet-size-surface-structure-pinning-and-liquid-properties
#8
Xiao Yan, Leicheng Zhang, Soumyadip Sett, Lezhou Feng, Chongyan Zhao, Zhiyong Huang, Hamed Vahabi, Arun K Kota, Feng Chen, Nenad Miljkovic
Coalescence-induced droplet jumping has the potential to enhance the efficiency of a plethora of applications. Although binary droplet jumping is quantitatively understood from energy and hydrodynamic perspectives, multiple aspects which affect jumping behavior including droplet size mismatch, droplet-surface interaction, and condensate thermophysical properties, remain poorly understood. Here, we develop a visualization technique utilizing microdroplet dispensing to study droplet jumping dynamics on nanostructured superhydrophobic, hierarchical superhydrophobic, and hierarchical biphilic surfaces...
January 9, 2019: ACS Nano
https://read.qxmd.com/read/30594112/interfacial-tensions-and-viscosities-in-multiphase-systems-by-surface-light-scattering-sls
#9
Thomas M Koller, Tobias Prucker, Junwei Cui, Tobias Klein, Andreas P Fröba
Multiphase systems are relevant in many fields of process engineering. For process and product design in connection with multiphase systems, knowledge on the thermophysical properties of the individual phases such as viscosity and on the interfacial tension between these is required but often lacking in literature. In the present study, the applicability of surface light scattering (SLS) for the simultaneous measurement of interfacial tensions and viscosities in multiphase systems in macroscopic thermodynamic equilibrium is demonstrated...
November 26, 2018: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30584762/microscopic-behaviors-of-tri-n-butyl-phosphate-n-dodecane-and-their-mixtures-at-air-liquid-and-liquid-liquid-interfaces-an-amber-polarizable-force-field-study
#10
Quynh N Vo, Liem Xuan Dang, Hung D Nguyen, Mikael Nilsson
In solvent extraction processes for recovering metal ions from used nuclear fuel, as well as other industrial applications, a better understanding of the metal complex phase transfer phenomenon would greatly aid ligand design and process optimization. We have approached this challenge by utilizing classical molecular dynamics simulations technique to gain visual appreciation of the vapor/liquid and liquid/liquid interface between tri-n-butyl phosphate (TBP) and n-dodecane with air and water. In this study, we successfully reparameterized polarizable force fields for TBP and n-dodecane that accurately reproduced several of their thermophysical properties such as: density, heat of vaporization, and dipole moment...
December 25, 2018: Journal of Physical Chemistry. B
https://read.qxmd.com/read/30567355/improved-resolution-of-4-chloromandelic-acid-and-the-effect-of-chlorine-interactions-using-r-benzyl-1-phenylethylamine-as-a-resolving-agent
#11
Yangfeng Peng, Cai Feng, Sohrab Rohani, Quan He
In order to avoid the disadvantage of commonly used resolving agent 1-phenylethylamine (hereafter: PEA), which is soluble in water, ( R )-(+)-benzyl-1-phenylethylamine (( R )-(+)-BPA) was used to resolve 4-chloromandelic acid (4-ClMA) in this study. The optimal resolution conditions were determined: absolute ethanol as a solvent, the molar ratio of 4-ClMA to ( R )-(+)-BPA as 1:1, the filtration temperature as 15 °C, and the amount of solvent as 1.6 mL/1 mmol 4-ClMA. Thermophysical properties, such as melting point, heat of fusion, and solubility, exhibited significant differences between the less and more soluble salts...
December 18, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/30495959/understanding-the-microscopic-behavior-of-binary-mixtures-of-ionic-liquids-through-various-spectroscopic-techniques
#12
Manjari Chakraborty, Tasnim Ahmed, Ranu Satish Dhale, Debashis Majhi, Moloy Sarkar
In recent times it has been shown that certain binary mixture of pure ionic liquids having appropriate chemical composition can behave like a new chemical entity. However, current knowledge about the microscopic behavior of these interesting systems is rather limited. The present study is undertaken with an objective to understand the microscopic behavior in terms of intermolecular interaction, structure and dynamics of these systems. In the present study, few (IL+IL) mixtures are chosen with a common cation and a variation of anion...
November 29, 2018: Journal of Physical Chemistry. B
https://read.qxmd.com/read/30475622/water-clathrates-in-nanostructural-organization-of-hydrated-ionic-liquids-manifest-in-peculiar-density-trend
#13
Mohammad Homaidur Rahman, Sanjib Senapati
Ionic liquid-water binary solutions have significantly expanded the applications of ionic liquids (ILs) in chemical and biological research. Therefore, considerable research has focused on measuring the thermophysical properties of these binary mixtures. From low-to-moderate concentrations of water, several IL/water mixtures exhibit deviations from expected trends in thermophysical behavior. One such example is a unique density trend observed for certain IL classes, which exhibit a characteristic increase in density with the addition of small amounts of water...
November 26, 2018: Journal of Physical Chemistry. B
https://read.qxmd.com/read/30471538/investigation-of-binding-interactions-between-bsa-and-epmpyr-sal-through-spectroscopy-studies-thermophysical-and-thermodynamic-properties
#14
Vasanthakumar Arumugam, Ramar Rajamanikandan, Malaichamy Ilanchelian, Kandasamy G Moodley, Gan G Redhi
The intensity of research, probing the interactions between proteins and ionic liquid (IL), has been increasing and parallels the fast-growing applications of ILs in biotechnology. The specific aspects which have attracted the involvement of researchers are stabilization, separation, biochemical and enzymatic reactions of proteins. In this work the synthesis of IL, epoxypropyl and N-methyl substituted 2‑oxopyrrolidinium cation with salicylate anion, [EPMpyr][Sal], and its interaction with aqueous BSA{BSA(aq) -[EPMpyr][Sal]}...
November 14, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://read.qxmd.com/read/30469877/photothermal-properties-of-plasmonic-nanoshell-blended-nanofluid-for-direct-solar-thermal-absorption
#15
Huiling Duan, Rongjie Chen, Yuan Zheng, Chang Xu
The excitation of localized surface plasmon at the metal nanoparticles can significantly enhance the absorption of solar energy. However, the absorption peak is sharp at the resonant frequency. To achieve a broadband absorption, the blended nanofluid formed by SiO2 /Ag nanoshells of different core size and shell thickness is employed. The blended nanofluid has a good solar absorption property, whose extinction spectrum matches the solar spectrum well. The transient temperature response of the nanofluid is simulated...
November 12, 2018: Optics Express
https://read.qxmd.com/read/30428982/variation-of-anionic-moieties-of-dicationic-ionic-liquid-gc-stationary-phases-effect-on-stability-and-selectivity
#16
Mohsen Talebi, Rahul A Patil, Leonard M Sidisky, Alain Berthod, Daniel W Armstrong
Dicationic ionic liquids (DILs) are more and more accepted as a new class of high temperature and polar stationary phases for gas chromatography (GC). This study deals with the effect of seven different fluorosulfonyl derivatized anions associated with two dications: 1,3-di(3-methylimidazolium)-2-methylpropane [2mC3 (mim)2 ], and 1,3-di(3-methylimidazolium)-isobutene [i-eneC4 (mim)2 ]. Thermophysical properties of the 14 synthesized DILs were evaluated in terms of melting point, viscosity, and thermal stability...
December 26, 2018: Analytica Chimica Acta
https://read.qxmd.com/read/30381980/clinical-validation-of-a-novel-thermophysical-bladder-model-designed-to-improve-the-accuracy-of-hyperthermia-treatment-planning-in-the-pelvic-region
#17
Gerben Schooneveldt, H Petra Kok, Akke Bakker, Elisabeth D Geijsen, Coen R N Rasch, Jean J M C H de la Rosette, Maarten C C M Hulshof, Theo M de Reijke, Hans Crezee
PURPOSE: Hyperthermia treatment planning for deep locoregional hyperthermia treatment may assist in phase and amplitude steering to optimize the temperature distribution. This study aims to incorporate a physically correct description of bladder properties in treatment planning, notably the presence of convection and absence of perfusion within the bladder lumen, and to assess accuracy and clinical implications for non muscle invasive bladder cancer patients treated with locoregional hyperthermia...
November 1, 2018: International Journal of Hyperthermia
https://read.qxmd.com/read/30372087/capillary-enhanced-filmwise-condensation-in-porous-media
#18
Ruisong Wang, Dion S Antao
Condensation is prevalent in various industrial and heat/mass transfer applications, and improving condensation heat transfer has a direct effect on process efficiency. Enhancing condensation performance has historically been achieved via the use of low surface energy coatings to promote the efficient dropwise mode over the typical filmwise mode of condensation. However, low surface tension fluids condense on these coatings in the filmwise mode, and low surface energy coatings are generally not robust at thicknesses required to enhance condensation heat transfer...
November 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/30372081/anisotropic-thermal-conductivity-of-suspended-black-phosphorus-probed-by-opto-thermomechanical-resonance-spectromicroscopy
#19
Arnob Islam, Anno van den Akker, Philip X-L Feng
Atomic layer semiconducting black phosphorus (P) exfoliated from its bulk crystals offers excellent properties and promises for emerging two-dimensional (2D) electronics, photonics, and transducers. It also possesses unique strong in-plane anisotropy among many 2D semiconductors, stemming from its corrugated crystal structure. As an important thermophysical aspect, probing the anisotropic thermal conductivity of black P is essential for device engineering, especially for energy dissipation and thermal management...
November 16, 2018: Nano Letters
https://read.qxmd.com/read/30342336/utilization-of-shale-cuttings-in-production-of-lightweight-aggregates
#20
K Piszcz-Karaś, M Klein, J Hupka, J Łuczak
The development of technologies for unconventional hydrocarbon exploration requires designing procedures to manage drilling waste that are consistent with the waste management hierarchy. In view of this, the possibility to apply shale drill cuttings as a prospective additive (replacing bentonite) to fly ash used for the production of lightweight aggregates (LWAs) was investigated. Moreover, a facile, waste-free method of LWAs production with using shales was proposed. Cuttings were characterized in terms of their mineralogical and elemental composition (XRD and XRF) as well as thermophysical behavior (TG-DTA and fusibility test)...
October 17, 2018: Journal of Environmental Management
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