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Thermophysical Properties

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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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