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Thermal properties

Jiaji Pan, Shen Ren, Praveen KaliappanSekar, Ji Peng, Zhiquan Andy Shu, Gang Zhao, Weiping Ding, Ming Chen, Dayong Gao
The lack of effective rewarming technique restricted the successful cryopreservation of organ or large tissues by vitrification. The conversion of electromagnetic (EM) energy into heat provides a possible solution for the rewarming process for the cryopreservation. In this work, an EM resonance rewarming system was set up with dynamic feedback control and power feeding optimization. In addition, we take advantage of magnetic nanoparticles (MNPs) to absorb magnetic field energy to further enhance the energy conversion efficiency...
December 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Hongyi Chen, Zhongmou Yue, Dudi Ren, Huarong Zeng, Tianran Wei, Kunpeng Zhao, Ronggui Yang, Pengfei Qiu, Lidong Chen, Xun Shi
Thermal conductivity is a very basic property that determines how fast a material conducts heat, which plays an important and sometimes a dominant role in many fields. However, because materials with phase transitions have been widely used recently, understanding and measuring temperature-dependent thermal conductivity during phase transitions are important and sometimes even questionable. Here, the thermal transport equation is corrected by including heat absorption due to phase transitions to reveal how a phase transition affects the measured thermal conductivity...
December 14, 2018: Advanced Materials
Dongxiang Luo, Peng Xiao, Baiquan Liu
Doping-free white organic light-emitting diodes (WOLEDs) have great potential to the next-generation solid-state lighting and displays due to the excellent properties, such as high efficiency, bright luminance, low power consumption, simplified structure and low cost. In this account, our recent developments on doping-free WOLEDs have been summarized. Firstly, fundamental concepts of doping-free WOLEDs have been described. Then, the effective strategies to develop doping-free WOLEDs have been presented. Particularly, the manipulation of charges and excitons distribution in different kinds of doping-free WOLEDs have been highlighted, including doping-free fluorescent/phosphorescent hybrid WOLEDs, doping-free thermally activated delayed fluorescent WOLEDs and doping-free phosphorescent WOLEDs...
December 13, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
M Dinkgreve, M A J Michels, T G Mason, D Bonn
The non-Newtonian flow behavior of thermal and athermal disordered systems of dispersed uniform particles at high densities have strikingly similar features. By investigating the flow curves of yield-stress fluids and colloidal glasses having different volume fractions, particle sizes, and interactions, we show that both thermal and athermal systems exhibit power-law scaling with respect to the glass and jamming point, respectively, with the same exponents. All yield-stress flow curves can be scaled onto a single universal curve using the Laplace pressure as the stress scale for athermal systems and the osmotic pressure for the thermal systems...
November 30, 2018: Physical Review Letters
Guo Zou, Li Zhao, Longwei Zeng, Kaijun Luo, Hailiang Ni, Haifeng Wang, Quan Li, Wenhao Yu, Xuelian Li
In this paper, we have designed and synthesized a series of neutral liquid-crystalline iridium(III) complexes based on polycatenar 2,5-diphenylpyridine and pyridyltetrazolate derivatives. Iridium(III) complexes all display highly emissive behavior with photoluminescence quantum yields in the range of 0.45-0.66 and a maximum emission wavelength at ∼563 nm. Hexagonal columnar mesophases of iridium(III) complexes can be obtained by changing the number and length of peripheral alkoxyl chains attached to a 2,5-diphenylpyridine ligand (main ligand) and a pyridyltetrazolate ligand (auxiliary ligand)...
December 14, 2018: Inorganic Chemistry
Thananjeyan Balasubramaniyam, Takumi Ishizuka, Yan Xu
We synthesized several DNA oligonucleotides containing one or several 2'-O-methyl-8-methyl guanosine (m8 Gm) and demonstrated that these oligonucleotides not only stabilize the Z-DNA with a wide range of sequences under low salt conditions but also possess high thermal stability. Using artificial nucleobase-containing oligonucleotides, we studied the interaction of the Zα domain with Z-DNA. Furthermore, we showed that the m8 Gm-contained oligonucleotides allow to study the photochemical reaction of Z-DNA.
December 6, 2018: Bioorganic & Medicinal Chemistry
Seungjun Noh, Hao Zhang, Katsuaki Suganuma
In this work, efforts were made to prepare a thermostable die-attach structure which includes stable sintered microporous Ag and multi-layer surface metallization. Silicon carbide particles (SiCp ) were added into the Ag sinter joining paste to improve the high-temperature reliability of the sintered Ag joints. The use of SiCp in the bonding structures prevented the morphological evolution of the microporous structure and maintained a stable structure after high temperature storage (HTS) tests, which reduces the risk of void formation and metallization dewetting...
December 12, 2018: Materials
Yang Kang, Fuyan Duan, Shaoxin Shangguan, Yixin Zhang, Tianpei Zhou, Bingcheng Si
Graphene combined with fractal structures would probably be a promising candidate design of an antenna for a wireless communication system. However, the thermal transport properties of fractal graphene, which would influence the properties of wireless communication systems, are unclear. In this paper, the thermal transport properties of graphene with a Sierpinski fractal structure were investigated via the reverse non-equilibrium molecular dynamics simulation method. Simulation results indicated that the thermal conductivity of graphene with fractal defects decreased from 157...
December 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Seon Young Bak, Sang Woo Lee, Chong Hyuk Choi, Hyun Woo Kim
Various methods for isolation of type I collagen using acids, bases, enzymes, and their combinations have been applied. However, a lack of standardization exists among type I collagens isolated by various approaches. Consequently, in this study, we assessed the influence of acetic acid residue on type I collagen isolated by pepsin-acetic acid treatment, the fabrication of collagen-based porous scaffolds, and the seeded cells on collagen scaffolds. Unlike the isolated collagen dialyzed by deionized water (DDW), collagen dialyzed by 0...
December 11, 2018: Materials
Yin-Yu Chang, Jia-Hao Zhang, Heng-Li Huang
Titanium dioxide and vanadium oxides have been applied extensively in industrial and medical fields. The objective of this study was to develop various composite structures of titanium and vanadium oxide (Ti-V-O) coatings on pure titanium through high-temperature annealing and laser texturing oxidation, separately; additionally, surface morphologies, tribological and hydrophilic properties, and antibacterial and biocompatibility abilities of these Ti-V-O coatings were evaluated. TiV alloy thin films were deposited on pure titanium and then annealed to form Ti-V-O coatings through thermal oxidation and laser texturing oxidation...
December 8, 2018: Materials
Eduard Kostetsky, Natalia Chopenko, Maria Barkina, Peter Velansky, Nina Sanina
Increasing global temperatures are expected to increase the risk of extinction of various species due to acceleration in the pace of shifting climate zones. Nevertheless, there is no information on the physicochemical properties of membrane lipids that enable the adaptation of the algae to different climatic zones. The present work aimed to compare fatty acid composition and thermal transitions of membrane lipids from green macroalgae Ulva lactuca harvested in the Sea of Japan and the Adriatic Sea in summer...
December 7, 2018: Marine Drugs
Izabela Barszczewska-Rybarek, Grzegorz Chladek
Bioactive dimethacrylate composites filled with silver nanoparticles (AgNP) might be used in medical applications, such as dental restorations and bone cements. The composition of bisphenol A glycerolate dimethacrylate (Bis-GMA) and triethylene glycol dimethacrylate (TEGDMA) mixed in a 60/40 wt% ratio was filled from 25 to 5000 ppm of AgNP. An exponential increase in resin viscosity was observed with an increase in AgNP concentration. Curing was performed by way of photopolymerization, room temperature polymerization, and thermal polymerization...
December 7, 2018: International Journal of Molecular Sciences
Yan Liu, Xiaoxu Tian, Chao Peng, Zongjun Du
A special eosinophilic agarase exo-type β-agarase gene, AgaDL6 , was cloned from a marine agar-degrading bacterium, Flammeovirga sp. HQM9. The gene comprised 1383-bp nucleotides encoding a putative agarase AgaDL6 of 461 amino acids with a calculated molecular mass of 52.8 kDa. Sequence analysis revealed a β-agarase domain that belongs to the glycoside hydrolase family (GH) 16 and a carbohydrate-binding module (CBM_4_9) unique to agarases. AgaDL6 was heterologously expressed in Escherichia coli BL21 (DE3)...
December 7, 2018: Journal of Microbiology and Biotechnology
S Chaudhuri, P A Bhobe, Arpan Bhattacharya, A K Nigam
With an aim to control the anti-site disorder between Fe and Ti atoms in the full Heusler alloy, Fe[Formula: see text]TiSn, we substitute a small percentage of Ti at Fe site to form the Fe[Formula: see text]Ti[Formula: see text]Sn ([Formula: see text]) series. Using the incident x-rays tuned to the Fe K-edge absorption energy, we record the high resolution synchrotron x-ray diffraction profiles and unambiguously show the reduction in anti-site disorder. In particular, the Fe-Ti anti-site disorder decreases up to an excess Ti content of 0...
December 13, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Jinjiang Xu, Shensheng Zheng, Shiliang Huang, Yong Tian, Yu Liu, Haobin Zhang, Jie Sun
A promising strategy for the preparation of novel gas inclusion host-guest energetic materials was provided by incorporating powerful oxidizer N2O into the crystal lattice cavity of 2,4,6,8,10,12-hexanitrohexaazatetracyclododecane (HNIW). The HNIW/N2O complex crystal exhibits a surprisingly high crystallographic density (2.038 g cm-3 at 298 K), more thermal stability, better predicted detonation properties and lower sensitivity compared to ε-HNIW due to its enhanced packing density, improved oxidation effect and added heat-release after N2O insertion...
December 13, 2018: Chemical Communications: Chem Comm
Chandana Kolluru, Yasmine Gomaa, Mark R Prausnitz
The aim of this study was to develop a dissolving microneedle (MN) patch for administration of inactivated polio vaccine (IPV) with improved thermal stability when compared with conventional liquid IPV. Excipient screening showed that a combination of maltodextrin and D-sorbitol in histidine buffer best preserved IPV activity during MN patch fabrication and storage. As determined by D-antigen ELISA, all three IPV serotypes maintained > 70% activity after 2 months and > 50% activity after 1-year storage at 5 °C or 25 °C with desiccant...
December 12, 2018: Drug Delivery and Translational Research
Stefan Cwik, Sebastian M J Beer, Marcel Schmidt, Nils C Gerhardt, Teresa de Los Arcos, Detlef Rogalla, Jana Weßing, Ignacio Giner, Martin Hofmann, Guido Grundmeier, Andreas D Wieck, Anjana Devi
Neodymium sulphide (Nd2S3) belongs to the exciting class of rare earth sulphides (RES) and is projected to have a serious potential in a wide spectrum of application either in pure form or as dopant. We demonstrate a facile and first growth of Nd2S3 thin films via metal-organic chemical vapour deposition (MOCVD) at moderate process conditions using two new Nd precursors, namely tris(N,N'-diisopropyl-2-dimethylamido-guanidinato)Nd(iii) and tris(N,N'-diisopropyl-acetamidinato)Nd(iii). The promising thermal properties and suitable reactivity of both Nd precursors towards elemental sulphur enabled the formation of high purity γ-Nd2S3...
December 13, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Teresa Delgado, Manuel Meneses-Sánchez, Lucía Piñeiro-López, Carlos Bartual-Murgui, M Carmen Muñoz, José Antonio Real
The search for bifunctional materials showing synergies between spin crossover (SCO) and luminescence has attracted substantial interest since they could be promising platforms for new switching electronic and optical technologies. In this context, we present the first three-dimensional FeII Hofmann-type coordination polymer exhibiting SCO properties and luminescence. The complex {FeII (bpben)[Au(CN)2 ]}@pyr (bpben = 1,4-bis(4-pyridyl)benzene) functionalized with pyrene (pyr) guests undergoes a cooperative multi-step SCO, which has been investigated by single crystal X-ray diffraction, single crystal UV-Vis absorption spectroscopy, and magnetic and calorimetric measurements...
November 28, 2018: Chemical Science
Neil Mallo, Eric D Foley, Hasti Iranmanesh, Aaron D W Kennedy, Ena T Luis, Junming Ho, Jason B Harper, Jonathon E Beves
The first in-depth, systematic study of the photoswitching properties of Donor-Acceptor Stenhouse Adducts (DASAs) is reported. Barbituric acid derived DASAs functionalised with 14 different amines ranging from dimethylamine to 4-methoxy- N -methylaniline were structurally characterised in solution using 1 H and 13 C NMR spectroscopy and, in eight cases, in the solid state by single crystal X-ray diffraction. The distribution of coloured and colourless isomers in the dark, their photostationary states under irradiation, apparent thermal half-lives, and fatigue resistance are systematically compared...
November 21, 2018: Chemical Science
Justine Wallyn, Nicolas Anton, Damien Mertz, Sylvie Begin-Colin, Francis Perton, Christophe Serra, Florence Franconi, Laurent Lemaire, Manuela Chiper, Helene Libouban, Nadia Messaddeq, Halina Anton, Thierry F Vandamme
Non-invasive diagnostic by imaging combined with contrast agent (CA) is by now the most used technique to get an insight inside human bodies. X-ray and magnetic resonance imaging (MRI) are widely used technologies providing complementary results. Nowadays, it seems clear that bimodal CAs could be an emerging approach to increase the patient compliance, accessing the different imaging modalities with a single CA injection. Owing to versatile designs, targeting properties and high payload capacity, nanocarriers are considered as a viable solution to reach this goal...
December 13, 2018: ACS Applied Materials & Interfaces
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