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Thermal properties

Subir Ghosh, Sylvester Abanteriba, Sherman Wong, Shadi Houshyar
A significant number of hip replacements (HR) fail permanently despite the success of the medical procedure, due to wear and progressive loss of osseointegration of implants. An ideal model should consist of materials with a high resistance to wear and with good biocompatibility. This study aims to develop a new method of grafting the surface of selective laser melted (SLM) titanium alloy (Ti-6Al-4V) with poly (2-methacryloyloxyethyl phosphorylcholine) (PMPC), to improve the surface properties and biocompatibility of the implant...
July 24, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Michele Michelin, Simon Liebentritt, António A Vicente, José António Teixeira
Corncob was successively pretreated by liquid hot water (LHW) and ethanol organosolv (EO) in an integrated process. LHW was performed at 200 °C for 30 min, and EO was performed using uncatalyzed ethanol-water solutions, according to a design of experiments. The effects of the most influential operational variables (ethanol concentration, temperature and time) on yield and chemical composition of the fractions were assessed. Results showed the factor with the greatest effect was ethanol concentration (p < 0...
August 10, 2018: International Journal of Biological Macromolecules
Jinyue Dai, Na Teng, Yunyan Peng, Yuan Liu, Lijun Cao, Jin Zhu, Xiaoqing Liu
A biobased benzoxazine resin (Dz-f) demonstrating excellent thermal properties was synthesized from daidzein and furfurylamine by using a microwave heating method. The chemical structure of synthesized benzoxazine monomer was identified by FTIR and NMR (1 H and 13 C NMR) before it was cured and its thermal properties evaluated by differential scanning calorimetry (DSC), TGA, and dynamic mechanical analysis (DMA). The cured resin p(Dz-f) exhibited a glass transition temperature (Tg ) of 391 °C, a very high char yield of 68...
August 13, 2018: ChemSusChem
Malwina Jaszczak, Radosław Wach, Piotr Maras, Mariusz Dudek, Marek Kozicki
This work discusses the substitution of a gelatine physical gel matrix with a matrix made of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic F-127) in five 3D radiotherapy polymer gel dosimeters: MAGAT, PAGAT, NIPAM, VIPARnd (VIP) and VIPARCT (VIC). The current research outcomes showed that not each polymer gel dosimeter could be manufactured with Pluronic F-127. Two of the polymer gel dosimeters (PAGAT and VIP) containing the Pluronic F-127 matrix allowed for some proper dose response for radiotherapy dosimetry (a response to a dose range of e...
August 13, 2018: Physics in Medicine and Biology
Jacie L Shuman, David J Coughlin
Climate change affects the thermal environment of aquatic organisms. Changes in the thermal environment may affect muscle function in the eurythermal rainbow smelt, Osmerus mordax, and relatively more stenothermal rainbow trout, Oncorhynchus mykiss. Literature suggests that the trout will be more sensitive to changes in environmental temperature, as they experience a more limited range of environmental temperatures. To examine the effects of thermal environment on red muscle function, both the smelt and trout were thermally acclimated to either a warm (12-15°C) or cold (4-5°C) temperature, after which studies of swimming performance and muscle mechanics were performed...
August 12, 2018: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
Ahmet Ulu, Samir Abbas Ali Noma, Suleyman Koytepe, Burhan Ates
This paper describes a new support that permits to efficient immobilization of L-asparaginase (L-ASNase). For this purpose, Fe3 O4 magnetic nanoparticles were synthesized and coated by MCM-41. 3-chloropropyltrimethoxysilane (CPTMS) was used as a surface modifying agent for covalent immobilization of L-ASNase on the magnetic nanoparticles. The chemical structure; thermal, morphological, and magnetic properties; chemical composition; and zeta potential value of Fe3 O4 @MCM-41-Cl were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential thermal analysis (DTA), differential scanning calorimetry (DSC), vibrating sample magnetometer (VSM), scanning electron microscope (SEM), energy dispersive X-ray (EDX), X-ray diffraction patterns (XRD), and zeta-potential measurement...
August 13, 2018: Applied Biochemistry and Biotechnology
K Kniec, L Marciniak
In this work we present the spectroscopic properties of LaGaO3:V,Nd3+ nanocrystals, which have been successfully obtained by the Pechini method. This is the first study where vanadium ions were applied in a LaGaO3 lattice for a non-contact luminescent thermometer. It was found that vanadium ions in the LaGaO3 matrix appear in three oxidation states, namely V5+, V4+ and V3+. It was found that the relative emission intensities of various states of vanadium ions depend strongly on grain size and therefore the emission color of LaGaO3:V can be easily modulated via the annealing temperature...
August 13, 2018: Physical Chemistry Chemical Physics: PCCP
Romee Jan, D C Saxena, Sukhcharn Singh
This study determined the effects of germination on the minerals, fatty acids, pasting, thermal, rheological and phytocomponents contents of Chenopodium album flour. The predominant fatty acids in raw flour were palmitic (0.83%), oleic (0.99%) and linoleic acids (1.96%), which increased significantly (p ≤ 0.05) with germination. Minerals (Na, Cu and Zn) and dietary fiber (soluble and insoluble) were increased with germination, while pasting and gelatinization properties were reduced significantly. Scanning electron micrographs showed destruction of the continuous composite structure of starch embedded in the dense protein matrix of flour following germination...
December 15, 2018: Food Chemistry
Xue Xiong, Meiling Qi
This work describes the separation performance of utilizing hexagonal boron nitride (h-BN) as the stationary phase for capillary gas chromatography (GC). The statically coated h-BN column showed moderate polarity and achieved column efficiencies of 3455 plates/m and 3800 plates/m for naphthalene and n-dodecane, respectively. With temperature-dependent structure properties, the h-BN stationary phase exhibited stronger retention for polycyclic aromatic hydrocarbons (PAHs) over phthalic acid esters (PAEs) and showed advantageous separation performance over the g-C3 N4 and commercial polysiloxane stationary phases...
September 14, 2018: Journal of Chromatography. A
Abubakar Hamisu Mijinyawa, Geeta Durga, Anuradha Mishra
Mucilage (represented as CEM) is abundantly present in Colocasia esculenta (L.) Schott or taro and is a water-soluble neutral polysaccharide that can act as a binder, thickening agent, and matrix agent in the pharmaceutical fields of research. Presence of hydroxyl groups on its surface structure allows chemical modification. This study describes in details the synthesis and characterization of its graft copolymer with polylactide (CEM-g-PLA). The polymerization has performed using both the microwave irradiation and conventional methods...
August 9, 2018: International Journal of Biological Macromolecules
Zhongyong Qiu, Xiaofei Ji, Chunju He
It is still a challenge to design and fabricate a robust nanoporous membrane in large scale and of fundamental importance for practical application. Here, a robust three/two-dimensional polyacrylonitrile/graphene oxide (PAN/GO) homogeneous nanoporous membrane is fabricated in large scale via thermally induced phase separation method, which guarantees the membrane with high mechanical strength and selective separation properties. Differing from conventional nanofiltration (NF) membrane with high rejection to both salt and dye, the resulting hybrid membrane is relative loose, which shows outstanding performances, i...
August 3, 2018: Journal of Hazardous Materials
Fouzi Benboujja, Sarah Bowe, Caroline Boudoux, Christopher Hartnick
Importance: Recurrent respiratory papillomatosis (RRP) is a viral-induced disease caused by human papillomavirus and the second leading cause of dysphonia in children; however, neither a cure nor a definitive surgical treatment is currently available for RRP. Although laser therapy is often used in the treatment of RRP, the lack of real-time laser-tissue interaction feedback undermines the ability of physicians to provide treatments with low morbidity. Therefore, an intraoperative tool to monitor and control laser treatment depth is needed...
August 9, 2018: JAMA Otolaryngology—Head & Neck Surgery
Wei Lu, Qin Gao, Chao Zou
Lyotropic chromonic (LC) mesophases have received much attention, due to the semi-stable nature of the chromonics. The balance is delicate between the forces attempting to create order and the thermal motion attempting to disrupt it. Thus, changes of temperature, concentration, electric and magnetic fields and the additives to the chromonic systems can be monitored sensitively. The general characterization methods for lyotropic chromonic mesophases, such as POM, multinuclear NMR spectroscopy and X-ray diffractometry, cryo-TEM and rheology etc...
August 11, 2018: Chemistry, An Asian Journal
Hui Zhang, Li Zhao, Qinglong Luo, Yuling Zhao, Tianzhi Yu
Three anthracen- or pyrene-based coumarin derivatives have been successfully synthesized and characterized by EA, IR and 1 H NMR. The photophysical properties of all derivatives were investigated by UV-Vis and photoluminescence spectroscopic analysis. Their thermal stabilities were demonstrated by TGA. These compounds exhibit strong blue mission under ultraviolet light excitation and have potential possible to explore organic electroluminescent materials. The vacuum-processed doped devices with a configuration of ITO/TAPC (20 nm)/TBADN: b1 (x wt%, 30 nm)/TPBi (50 nm)/Liq (2 nm)/Al (150 nm) was fabricated, in which the devices based on b1 exhibited the best electroluminescence performance with a maximum brightness of 8165 cd/m2 and a maximum luminous efficiencies of 6...
August 10, 2018: Journal of Fluorescence
Jose A Hernandez, Angel Ruiz, Luis F Fonseca, Michael T Pettes, Miguel Jose-Yacaman, Alfredo Benitez
Tin selenide (SnSe) has been the subject of great attention in the last years due to its highly efficient thermoelectricity and its possibilities as a green material, free of Pb and Te. Here, we report for the first time a thermoelectricity and transport study of individual SnSe micro- and nano-wires with diameters in the range between 130 nm and 1.15 μm. X-ray diffraction and transmission electron microscopy analyses confirm an orthorhombic SnSe structure with Pnma (62) symmetry group and 1:1 Sn:Se atomic ratio...
August 10, 2018: Scientific Reports
Toshifumi Kano, Yui Katsuragi, Yusuke Maeda, Yoshihito Ueno
Synthesis and properties of double-stranded RNAs (dsRNAs) and small interfering RNAs (siRNAs) containing 4'-C-aminoethyl-2'-deoxy-2'-fluorouridine are described. Thermal denaturation studies showed that incorporation of 4'-C-aminoethyl-2'-fluoro analog improved the thermal stabilities of dsRNAs and siRNAs compared to the corresponding 4'-C-aminoethyl-2'-O-methyl analog. siRNA incorporating eight 4'-aminoethyl-2'-fluoro analogs in the passenger strand showed sufficient RNAi activity at 1 nM concentration, which was similar to that of the unmodified siRNA...
August 2, 2018: Bioorganic & Medicinal Chemistry
Philipp Wiechmann, Hannes Panwitt, Horst Heyer, Michael Reich, Manuela Sander, Olaf Kessler
Wide softening zones are typical for welded joints of age hardened aluminium alloys. In this study, the microstructure evolution and distribution of mechanical properties resulting from welding processes of the aluminium alloy EN AW-6082 (AlSi1MgMn) was analysed by both in-situ and ex-situ investigations. The in-situ thermal analyses (TMA) included differential scanning calorimetry (DSC), which was used to characterise the dissolution and precipitation behaviour in the heat affected zone (HAZ) of welded joints...
August 9, 2018: Materials
Kyungho Kim, Geoffrey Daniel, Vadim G Kessler, Gulaim A Seisenbaeva, Vilas G Pol
Nano α-MnO₂ is usually synthesized under hydrothermal conditions in acidic medium, which results in materials easily undergoing thermal reduction and offers single crystals often over 100 nm in size. In this study, α-MnO₂ built up of inter-grown ultra-small nanoflakes with 10 nm thickness was produced in a rapid two-step procedure starting via partial reduction in solution in basic medium subsequently followed by co-proportionation in thermal treatment. This approach offers phase-pure α-MnO₂ doped with potassium (cryptomelane type K0...
August 9, 2018: Nanomaterials
Ranjith Kumar Kankala, Feng-Jun Lu, Chen-Guang Liu, Shan-Shan Zhang, Ai-Zheng Chen, Shi-Bin Wang
In recent times, cartilage defects have been the most common athletic injuries, often leading to dreadful consequences such as osteoarthritis, pain, joint deformities, and other symptoms. It is also evident that damage to articular cartilage is often difficult to recover or self-heal because of poor vascular, nervous, and lymphatic supplies. Moreover, cartilage cells have poor regeneration ability and high maturity. Inspired by these facts and the rapid advances in the field of tissue engineering (TE), we fabricated highly porous three-dimensional (3D) scaffold architectures based on cell-responsive polymeric inks, i...
August 9, 2018: Materials
Chi Zhang, James W Palko, Guoguang Rong, Kenneth S Pringle, Michael Thomas Barako, Thomas J Dusseault, Mehdi Asheghi, Juan G Santiago, Kenneth E Goodson
Microporous metals are used extensively for applications that combine convective and conductive transport and benefit from the low resistance to both modes of transport. Conventional fabrication methods, such as direct sintering of metallic particles, however, often produce structures with limited fluid transport property due to the lack of control over pore morphologies such as pore sizes and porosity. Here, we demonstrate control and improvement of hydraulic permeability of microporous copper structures fabricated using template-assisted electrodeposition...
August 10, 2018: ACS Applied Materials & Interfaces
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