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Thermophysical Properties

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https://www.readbyqxmd.com/read/30342336/utilization-of-shale-cuttings-in-production-of-lightweight-aggregates
#1
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
https://www.readbyqxmd.com/read/30334103/insight-into-the-gas-phase-dissociation-of-cf-3-ch-2-i-and-its-reactions-with-h-and-oh-by-first-principles
#2
Shaan Ameer, Monika Tomar, Pradip Kumar Jha, Vinay Gupta
The Arrhenius kinetic parameters of dissociation reactions and reactions of CF3 CH2 I with radicals like H, O, and OH are determined using highly accurate first principles calculations. Thermophysical properties like molar heat capacity (Cp ), thermal stability index, and the bond dissociation energies are also determined for the CF3 CH2 I molecule under the PBE/DNP formalism. Since, there are no theoretical study or experimental investigation reports available regarding the dissociation reactions of CF3 CH2 I and reactions of this molecule with the H and OH radical, a parallel comparative analysis is done with similar iodoalkanes to ascertain the precision of the results obtained...
October 17, 2018: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/30327231/tissue-burns-due-to-contact-between-a-skin-surface-and-highly-conducting-metallic-media-in-the-presence-of-inter-tissue-boiling
#3
John P Abraham, John Stark, John Gorman, Ephraim Sparrow, W J Minkowycz
A numerical-based model was developed and implemented to determine the spatial and temporal temperature distributions within skin tissue resulting from thermal contact with a heated and high thermal conductivity metallic medium. In the presence of wet tissue, boiling is likely to occur, thereby affecting the probability of inducing burns. This investigation deals with how contact between a hot, highly conductive metallic material and skin gives rise to burns. In particular, the study focuses on the likelihood that metals typically used in cooking or industrial applications may cause burns...
October 13, 2018: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/30278753/note-thermal-conductivity-measurement-of-individual-porous-polyimide-fibers-using-a-modified-wire-shape-3-%C3%AF-method
#4
L Qiu, Y Ouyang, Y Feng, X Zhang
Porous polyimide fiber enjoys a good reputation as a high temperature resistant thermal insulation material in an aircraft-carrier, a spacecraft, and other military sophisticated products. Understanding its thermal conductivity is especially important for the design optimization and thermal management in these applications. In this study, a modified wire-shape 3 ω method is developed to measure the thermal conductivity of individual porous polyimide fibers, utilizing a platinum layer heater/thermometer deposited along the circumferential direction of the fiber...
September 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/30251454/acyclic-and-cyclic-alkyl-and-ether-functionalised-sulfonium-ionic-liquids-based-on-the-tfsi-and-fsi-anions-as-potential-electrolytes-for-electrochemical-applications
#5
Sinead Murphy, Flavien Ivol, Alex R Neale, Peter Goodrich, Fouad Ghamouss, Christopher Hardacre, Johan Jacquemin
This work provides a study based on acyclic and cyclic sulfonium ionic liquids (ILs) with alkyl and ether-functionality on the cation paired with the bis{(trifluoromethyl)sulfonyl}imide, [TFSI]-, or the bis(fluorosulfonyl)imide, [FSI]-, as the counter anion. Herein, thermophysical characterisation of nine sulfonium-based ILs concerning the density, viscosity and conductivity and thermal properties including phase transition behaviour and decomposition temperature is reported. The electrochemical stability of the ILs was also measured by cyclic voltammetry at a glassy carbon macro-disk electrode...
September 25, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/30196898/numerical-investigation-of-the-effect-of-vessel-size-and-distance-on-the-cryosurgery-of-an-adjacent-tumor
#6
Malikeh Nabaei, Mehrdad Karimi
Cryosurgery is an efficient cancer treatment which can be used for non-invasive ablation of some internal tumors such as liver and prostate. Tumors are usually located near the large blood vessels and the heat convection may affect the progression of the ice ball. Hence it is necessary to predict the surgery procedure and its consequences earlier. In spite of the recent studies it is still unclear that which arteries will significantly affect the freezing treatment of tumors and which can be ignored. Therefore a numerical model of a spherical 3 cm diameter liver tumor, subjected to cryosurgery was developed...
October 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/30184704/high-frequency-measurements-of-thermophysical-properties-of-thin-films-using-a-modified-broad-band-frequency-domain-thermoreflectance-approach
#7
Mohammadreza Shahzadeh, Mizanur Rahman, Olav Hellwig, Simone Pisana
In this work, we present the implementation of a new method to perform high-frequency thermoreflectance measurements on thin films. The so-called differential broad-band frequency domain thermoreflectance method follows broad-band frequency domain thermoreflectance developed previously [Regner et al. , Rev. Sci. Instrum. 84 (6), 064901 (2013)], without the use of expensive electro-optic modulators. Two techniques are introduced to recover the thermal phase of interest and to separate it from the unwanted instrumental contributions to the recorded phase...
August 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/30112829/autocatalytic-synthesis-of-bifluoride-ionic-liquids-by-sufex-click-chemistry
#8
Taha Hmissa, Xiaofei Zhang, Nilesh R Dhumal, Gregory J McManus, Xu Zhou, Hunaid B Nulwala, Arsalan Mirjafari
Ionic liquids with bifluoride anions possess properties such as high conductivity, wide electrochemical windows, and low viscosity that make them attractive materials for various electrochemical devices. However, owing to the lack of reliable synthetic routes, bifluoride-based ionic liquids have seldom been explored. Herein, an autocatalytic strategy for the HF-free synthesis of bifluoride-based sulfonamide ionic liquids based on the sulfur(VI) fluoride exchange (SuFEx) reaction is reported. This reaction requires no chromatographic purification, and yields are quantitative...
August 15, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30103537/numerical-experimental-study-of-the-consolidation-phenomenon-in-the-selective-laser-melting-process-with-a-thermo-fluidic-coupled-model
#9
Francisco Cordovilla, Ángel García-Beltrán, Miguel Garzón, Diego A Muñoz, José L Ocaña
One of the main limiting factors for a widespread industrial use of the Selective Laser Melting Process it its lack of productivity, which restricts the use of this technology just for high added-value components. Typically, the thickness of the metallic powder that is used lies on the scale of micrometers. The use of a layer up to one millimeter would be necessarily associated to a dramatic increase of productivity. Nevertheless, when the layer thickness increases, the complexity of consolidation phenomena makes the process difficult to be governed...
August 12, 2018: Materials
https://www.readbyqxmd.com/read/30063935/chitosan-coated-nanostructured-lipid-carriers-nlcs-for-loading-vitamin-d-a-physical-stability-study
#10
Renata S Rabelo, Isabela F Oliveira, Vanessa M da Silva, Ana Silvia Prata, Miriam D Hubinger
A nanostructured lipid carrier (NLC) has been developed as a loading system for Vitamin D (VD). The NLCs were obtained by melt-emulsification method and coated with chitosan (CHI) by electrostatic deposition. The lipids used in the formulations were selected in order to provide higher encapsulation efficiency. Thermophysical properties of particles were evaluated by differential scanning calorimetry; particle stability was characterized by size distribution, polydispersity index, zeta-potential and light backscattering...
November 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29971855/chemical-tuning-of-zwitterionic-ionic-liquids-for-variable-thermophysical-behaviours-nanostructured-aggregates-and-dual-stimuli-responsiveness
#11
Yajnaseni Biswas, Pratyush Ghosh, Tarun K Mandal
The design and synthesis of a series of zwitterionic ionic liquids (ZILs) to understand the structure-property relationship towards an increase of the thermal stability, a variation of the glass transition temperature, the shape-tuning of nanostructured aggregates and the tuning of the stimuli responsiveness are demonstrated. The substitution reaction of imidazole with various aliphatic and aromatic bromides followed by the reaction of the corresponding substituted imidazoles with bromoalkyl carboxylic acids of varying spacer length produces the ZILs...
September 6, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29952649/thermophysical-properties-of-thermosoftening-nasotracheal-tubes
#12
Yoshihiro Takasugi, Koichi Futagawa, Takashi Umeda, Kouhei Kazuhara, Satoshi Morishita
Thermosoftening treatment of polyvinyl chloride (PVC) nasotracheal tubes (NTTs) can reduce the incidence and amount of epistaxis during nasotracheal intubation. The optimal thermal setting for thermosoftening treatment of NTTs without burn injury was investigated. Two composite types of PVC NTTs were used. Following withdrawal of the PVC NTTs from a bottle of water at 45 or 60°C, the changes in the surface temperature of the NTTs were measured by infrared thermography. Hardness of the NTTs at 25, 30, 35, and 40°C was measured...
2018: Anesthesia Progress
https://www.readbyqxmd.com/read/29757650/analytical-model-for-diffusive-evaporation-of-sessile-droplets-coupled-with-interfacial-cooling-effect
#13
Tuan A H Nguyen, Simon R Biggs, Anh V Nguyen
Current analytical models for sessile droplet evaporation do not consider the nonuniform temperature field within the droplet and can overpredict the evaporation by 20%. This deviation can be attributed to a significant temperature drop due to the release of the latent heat of evaporation along the air-liquid interface. We report, for the first time, an analytical solution of the sessile droplet evaporation coupled with this interfacial cooling effect. The two-way coupling model of the quasi-steady thermal diffusion within the droplet and the quasi-steady diffusion-controlled droplet evaporation is conveniently solved in the toroidal coordinate system by applying the method of separation of variables...
June 12, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29727563/configuration-sampling-based-surrogate-models-for-rapid-parameterization-of-non-bonded-interactions
#14
Richard A Messerly, S Mostafa Razavi, Michael R Shirts
In this study, we present an approach for rapid force field parameterization and uncertainty quantification of the non-bonded interaction parameters for classical force fields. The accuracy of most thermophysical properties, and especially vapor-liquid equilibria (VLE), obtained from molecular simulation depends strongly on the non-bonded interactions. Traditionally, non-bonded interactions are parameterized to agree with macroscopic properties by performing large amounts of direct molecular simulation. Due to the computational cost of molecular simulation, surrogate models (i...
June 12, 2018: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29660460/influences-of-modified-bacterial-cellulose-nanofibers-bcns-on-structural-thermophysical-optical-and-barrier-properties-of-poly-ethylene-co-vinyl-acetate-eva-nanocomposite
#15
Shila Shirdel Ghadikolaei, Abdollah Omrani, Morteza Ehsani
The BCNs were chemically modified using acetic anhydride with the aim of improving its dispersion and interfacial adhesion. Acetylation of BCNs was confirmed by FT-IR spectroscopy. Morphology studies using TEM and SEM revealed that a reasonable dispersion of the modified BCNs in the EVA matrix was accomplished. The DSC data displayed a little shift in the Tg to higher temperatures with the incorporation of both modified and unmodified BCNs. Increased thermal stability of the nanocomposites consisting acetylated BCNs was confirmed by TGA technique...
August 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29660316/vitrification-tendency-and-stability-of-dp6-based-vitrification-solutions-for-complex-tissue-cryopreservation
#16
Brian Wowk, Gregory M Fahy, Susan Ahmedyar, Michael J Taylor, Yoed Rabin
Vitrification tendency and stability of the amorphous state were analyzed by means of differential scanning calorimetry (DSC) for the vitrification solution DP6, with and without additional solutes to enhance ice suppression. This study is a part of an ongoing research effort to characterize the thermophysical and mechanical properties of DP6 and its derivatives, and their qualities as cryoprotective solutions. DP6 was determined to have a critical cooling rate necessary to ensure vitrification of 2.7 °C/min...
June 2018: Cryobiology
https://www.readbyqxmd.com/read/29578239/prediction-of-liquid-specific-heat-capacity-of-food-lipids
#17
Xiaoyi Zhu, David M Phinney, Sravanti Paluri, Dennis R Heldman
Specific heat capacity (cp ) is a temperature dependent physical property of foods. Lipid-being a macromolecular component of food-provides some fraction of the food's overall heat capacity. Fats/oils are complex chemicals that are generally defined by carbon length and degree of unsaturation. The objective of this investigation was to use advanced specific heat capacity measurement to determine the effect of fatty acid chemical structure on specific heat capacity of food lipids. In this investigation, the specific heat capacity of a series of triacylglycerols were measured to quantify the influence of fatty acid composition on specific heat capacity based on two parameters; the -average carbon number (C) and the average number of double bonds (U)...
April 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29542737/science-at-home-measuring-a-thermophysical-property-of-water-with-a-microwave-oven
#18
Zachary H Levine
A measurement of a thermophysical property of water is made using items found in the author's home. Specifically, the ratio of the energy required to heat water from the melting point to boiling to the energy required to completely boil away the water is found to be 5.7. This may be compared to the standard value of 5.5. The close agreement is not representative of the actual uncertainties in this simple experiment. Heating water in a microwave oven can let a student apply the techniques of quantitative science based on questions generated by his or her scientific curiosity...
February 2018: The physics teacher
https://www.readbyqxmd.com/read/29513336/on-the-relevance-of-thermophysical-characterization-in-the-microwave-treatment-of-legumes
#19
Annalisa Dalmoro, Carlo Naddeo, Silvestro Caputo, Gaetano Lamberti, Liberata Guadagno, Matteo d'Amore, Anna Angela Barba
This study is focused on the characterization of the thermal behavior and physical properties of the most consumed legumes in the daily diet such as beans, lentils and chickpeas. Because of a lack of information in the literature about the effect of microwave treatments on legumes, characterization protocols have been applied before and after subjecting them to microwave irradiation suitable for pest disinfestation. The effects of two different radiative treatments, one suitable for inactivating the infesting fauna and the other simulating uncontrolled treatments, characterized by very high temperatures, were tested...
March 1, 2018: Food & Function
https://www.readbyqxmd.com/read/29382094/experimental-study-on-the-thermal-start-up-performance-of-the-graphene-water-nanofluid-enhanced-solar-gravity-heat-pipe
#20
Shanguo Zhao, Guoying Xu, Ning Wang, Xiaosong Zhang
The solar gravity heat pipe has been widely used for solar thermal water heating because of its high efficient heat transfer and thermal diode characteristics. Operated on fluctuant and low intensity solar radiation conditions, a solar gravity heat pipe may frequently start up. This severely affects its solar collection performance. To enhance the thermal performance of the solar gravity heat pipe, this study proposes using graphene/water nanofluid as the working fluid instead of deionized water. The stability of the prepared graphene/water nanofluid added with PVP was firstly investigated to obtain the optimum mass ratios of the added dispersant...
January 28, 2018: Nanomaterials
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