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Thermo physical Properties

Jingang Li, Eric H Hill, Linhan Lin, Yuebing Zheng
Recent advances in chemical sciences have enabled the tailorable synthesis of colloidal particles with variable composition, size, shape and properties. Building superstructures with colloidal particles as building blocks is appealing for the fabrication of functional metamaterials and nanodevices. Optical nano-printing provides a versatile platform to print various particles into arbitrary configurations with nanometric precision. In this review, we summarize recent progress in optical nano-printing of colloidal particles and its related applications...
March 15, 2019: ACS Nano
Sa Liu, Dawei Qi, Yunhua Chen, Lijing Teng, Yongguang Jia, Li Ren
A supramolecular hybrid hydrogel displaying a wide array of dynamic physical properties along with enhanced in vivo stem cell retention has been developed. The key strategy is facilely polymerizing bioactive gelatin methacrylate (GelMA) with 2-(2-methoxyethoxy)ethyl methacrylate (MEO2MA) and 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl)ureido)ethyl methacrylate (UPyMA) to generate one hybrid branched copolymer. Rapid gelation occurs upon increasing the temperature above the lower critical solution temperature (LCST) of this supramolecular copolymer, where PMEO2MA segments dehydrate and assemble into clusters, providing a hydrophobic microenvironment facilitating UPy dimerization to connect polymer chains, thus forming quadruple hydrogen bond reinforced crosslinking networks...
March 13, 2019: Biomaterials Science
Tarak K Patra, Henry Chan, Paul Podsiadlo, Elena V Shevchenko, Subramanian K R S Sankaranarayanan, Badri Narayanan
Precise engineering of nanoparticle superlattices (NPSLs) for energy applications requires a molecular-level understanding of the physical factors governing their morphology, periodicity, mechanics, and response to external stimuli. Such knowledge, particularly the impact of ligand dynamics on physical behavior of NPSLs, is still in its infancy. Here, we combine coarse-grained molecular dynamics simulations, and small angle X-ray scattering experiments in a diamond anvil cell to demonstrate that coverage density of capping ligands (i...
March 4, 2019: Nanoscale
Stefano Bellucci, Gianluigi Bovesecchi, Antonino Cataldo, Paolo Coppa, Sandra Corasaniti, Michele Potenza
Thermal diffusivity of GNPs (graphene nano-platelets) is an important thermo-physical property as it is useful to predict the material behavior in many heat transfer applications. GNP samples were pressed at different loads to obtain different densities, and then thermal diffusivity was measured with the flash method. All samples were coated with a thin layer (~1 µm) of colloidal graphite (Aquadag® ) on both sides to reduce reflectance of their surfaces and consequently increase the emissivity. Carrying out measurements on both samples with and without coating, a difference between the two series of measurements was found: This is attributed to a non-negligible transmittance of the uncoated samples due to the porosity of GNPs ...
February 27, 2019: Materials
Adela Salas-Ruiz, María Del Mar Barbero-Barrera, Trinidad Ruiz-Téllez
Water Hyacinth ( Eichhornia crassipes ) is a dangerous and invasive aquatic species, of which global concern has sharply risen due to its rapid growth. Despite ample research on its possible applications in the construction field, there are no clear references on the optimal use of the plant in finding the most efficient-use building material. In this paper, a microstructural and chemical characterization of the Water Hyacinth petiole was performed, in order to find the most efficient use as a construction material...
February 13, 2019: Materials
Matthew Benton, Mohammad Robiul Hossan, Prashanth Reddy Konari, Sanjeewa Gamagedara
Laser micromachining has emerged as a promising technique for mass production of microfluidic devices. However, control and optimization of process parameters, and design of substrate materials are still ongoing challenges for the widespread application of laser micromachining. This article reports a systematic study on the effect of laser system parameters and thermo-physical properties of substrate materials on laser micromachining. Three dimensional transient heat conduction equation with a Gaussian laser heat source was solved using finite element based Multiphysics software COMSOL 5...
February 14, 2019: Micromachines
Xu Cheng, Xinyu Wang
One-dimensional nanotubes, such as, carbon nanotube (CNT) and C3N nanotube (C<sub>3</sub>NNT), are attracting growing research interest due to their excellent electrical and thermal properties. In this work, thermal transport of single-walled C<sub>3</sub>NNT is investigated in comparison with the single-walled CNT using classical molecular dynamics (MD) simulations. We firstly observe that the thermal conductivity (<i>k</i>) of C<sub>3</sub>NNT is lower than that of CNT...
February 15, 2019: Nanotechnology
Huaxiu Xu, Yun Tan, Wenhui Rao, Di Wang, Shimei Xu, Wang Liao, Yu-Zhong Wang
Hydrogels are known as soft and wet materials. Development of metal-like hydrogels with super strong and malleable properties is highly desirable as it allows for broader application and reprocessability. Here we report a dual nanocomposite hydrogel with peculiar mechanical properties in water-poor region. The gel with water content of 35% exhibits excellent recovery and fatigue resistance with elongation at break exceeding 800%, while the gel with 15 wt% of water content shows an ultra-high compressive strength and modulus of more than 1 GPa...
February 6, 2019: Journal of Colloid and Interface Science
Biwei Deng, Gary J Cheng
In this work, a general mechanism is discovered to form liquid-metal-based, stable and stretchable conductive patterns on rigid and soft substrates. It is discovered that pulsed laser irradiation of liquid metal nanoparticles (LMNPs) with tunable conditions can induce transformation to stable and stretchable solid-liquid (S-L) dual phases on various surfaces. Formation of this unique solid-liquid composite phase is the key to change the wetting behavior of the conductive patterns on various substrates and enables mechanically stable patterns on various substrates...
February 13, 2019: Advanced Materials
Ebtisam Saeed, Manuel M Piñeiro, Carolina Hermida-Merino, María José Pastoriza-Gallego
Suspensions of nanometric-sized graphene platelets have been proposed recently as potential heat exchange working fluids, due to their remarkably enhanced thermal profile. Nevertheless, their use presents serious long-term stability issues. Due to this limitation, the nanoplatelets surface chemical functionalization has been postulated as a promising alternative to solve this problem. In this work, graphene nanoplatelets were functionalized following an oxidation-reduction process, and then dispersed in glycol as base fluid...
February 12, 2019: Nanomaterials
U N Roy, G S Camarda, Y Cui, R Gul, A Hossain, G Yang, J Zazvorka, V Dedic, J Franc, R B James
Because of its ideal band gap, high density and high electron mobility-lifetime product, cadmium zinc telluride (CdZnTe or CZT) is currently the best room-temperature compound-semiconductor X- and gamma-ray detector material. However, because of its innate poor thermo-physical properties and above unity segregation coefficient for Zn, the wide spread deployment of this material in large-volume CZT detectors is still limited by the high production cost. The underlying reason for the low yield of high-quality material is that CZT suffers from three major detrimental defects: compositional inhomogeneity, high concentrations of dislocation walls/sub-grain boundary networks and high concentrations of Te inclusions/precipitates...
February 7, 2019: Scientific Reports
Pengcheng Li, Fengai Zhao, Haiyan Xiao, Haibin Zhang, Hengfeng Gong, Sa Zhang, Zijiang Liu, Xiaotao Zu
A density functional theory plus Hubbard U method is used to investigate how the incorporation of Pu waste into Gd₂Zr₂O₇ pyrochlore influences its thermo-physical properties. It is found that immobilization of Pu at Gd-site of Gd₂Zr₂O₇ has minor effects on the mechanical and thermal properties, whereas substitution of Pu for Zr-site results in remarkable influences on the structural parameters, elastic moduli, elastic isotropy, Debye temperature and electronic structure. The discrepancy in thermo-physical properties between Gd2-y Puy Zr₂O₇ and Gd₂Zr2-y Puy O₇ may be a result of their different structural and electronic structures...
February 3, 2019: Nanomaterials
Safia Hameed, Ali T Khalil, Muhammad Ali, Muhammad Numan, Saleh Khamlich, Zabta K Shinwari, Malik Maaza
AIM: To investigate the physical and biological properties of Silybum marianum inspired ZnO nanoparticles (NPs), Ag-ZnO heterostructures. Experiment: Nanoparticles were characterized using ultraviolet-visible and infrared spectroscopy, x-ray diffraction, high resolution electron microscopy, ζ potential and thermo-gravimetric analysis etc. Results: Ag-ZnO-NPs indicated slightly higher antimicrobial potential then ZnO-NPs. Good antileishmanial (IC50  = 246 μg/ml for Ag-ZnO; 341 μg/ml for ZnO) and antioxidant potential while moderate enzyme inhibition is reported...
February 4, 2019: Nanomedicine
Ante Miličević, Kristina Goršeta, Raimond Nv van Duinen, Domagoj Glavina
Glass Ionomer Cements (GIC) have been widely used in clinical practice since they have a wide range of positive characteristics: chemical bonding to the tooth surface, fluoride release, a heat-expansion coefficient similar to the tooth, do not require an absolutely dry working area, less volumetric contraction, good color stability. Physical properties can be improved by using external energy such as ultrasound and radiant heat (thermo-curing) , which also accelerates chemical curing. Objectives: The aim of this study was to determine the most effective polishing technique and to compare the surface roughness of two Glass Ionomer Cements after treatment with heat (thermo-curing), and without heat treatment during the setting process...
December 2018: Acta Stomatologica Croatica
Zhichao Dong, Yabo Liu, Weibin Wen, Jingran Ge, Jun Liang
In this study, a combined simulation and experimental approach is utilized to investigate the influence of hatch spacing on the microstructure and as-built quality of 316L stainless steel (SS) samples fabricated by selective laser melting (SLM). A three-dimensional finite element model (FEM) is employed to investigate heat transfer and melt pool during the SLM of 316L SS. The phase transformation and variation of the thermo-physical properties of the materials are considered in this model. The effects of hatch spacing (H) on the temperature field, microstructure and melt pool size, overlap rate, surface quality, and relative density during the SLM of 316L SS are investigated...
December 24, 2018: Materials
Haishi Qiao, Jing Jia, Wei Chen, Bin Di, Oren A Scherman, Chi Hu
The fabrication, characterization, and therapy efficiency of a noncovalent-bonded hydrogel network, which is assembled by utilizing cucurbit[7]uril as a supramolecular linker to "stick" superparamagnetic γ-Fe2 O3 nanoparticles onto the polymer backbone of catechol-functionalized chitosan are described. The unique barrel-shaped structure of cucurbit[7]uril not only facilitates host-guest recognition with the catechol derivatives, but also forms robust electrostatic interactions between its carbonyl portals and the γ-Fe2 O3 nanoparticles in a supramolecular manner, which leaves the physical and chemical properties of the nanoparticles intact...
December 13, 2018: Advanced Healthcare Materials
Sunday Samuel Sobowale, Oluwatoyin Habibat Animashaun, Antoine Floribert Mulaba-Bafubiandi, Temitope Saratallahi Abidoye, Yusuf Olamide Kewuyemi, Oluwafemi Ayodeji Adebo
The current industrial demand for starchy foods has been dominated by other roots and tubers, while cocoyam, despite being rich in fiber, minerals, and vitamins has remained under exploited. In this study, the effect of feed moisture content (FMC), screw speed (SS) and barrel temperature (BT) on the quality characteristics of cocoyam noodles (proximate, thermo-physical, physicochemical, texture, color, extrudate properties, and sensory characteristics) were investigated using central composite design (CCD) of response surface methodology (RSM)...
November 2018: Food Science & Nutrition
Yanping Huang, Nianhua Dan, Weihua Dan, Weifeng Zhao, Zhongxiang Bai, Yining Chen, Changkai Yang
A growth of bacterial infections and over-and inefficient release of antibiotics forces one to search new antibacterial agents and/or strategies. In this study, a novel strategy towards biocompatible and antibacterial bilayer wound dressing was proposed by a two-step spin coating method combined with in-situ crosslinking polymerization. First, through in-situ crosslinking polymerization, [2-(methacryloyloxy) ethyl] trimethylammonium chloride ([MTA][Cl]) was polymerized and crosslinked in polycaprolactone (PCL) solution and PCL/PMTA solution was obtained...
November 28, 2018: International Journal of Biological Macromolecules
Jingjie Yeo, Wenwen Huang, Anna Tarakanova, Yong-Wei Zhang, David L Kaplan, Markus J Buehler
Adaptive hydrogels tailor-made from silk-elastin-like proteins (SELPs) possess excellent biocompatibility and biodegradability with properties that are tunable and responsive to multiple simultaneous external stimuli. To unravel the molecular mechanisms of their physical response to external stimuli in tandem with experiments, here we predict and measure the variation in structural properties as a function of temperature through coarse-grained (CG) modeling of individual and crosslinked SE8Y and S4 E8Y molecules, which have ratios of 1:8 and 4:8 of silk to elastin blocks respectively...
June 14, 2018: Journal of Materials Chemistry. B, Materials for Biology and Medicine
Javier Conesa-Egea, Noemí Nogal, José Ignacio Martínez, Vanesa Fernández-Moreira, Ulises R Rodríguez-Mendoza, Javier González-Platas, Carlos J Gómez-García, Salomé Delgado, Félix Zamora, Pilar Amo-Ochoa
One-pot reactions between CuI and methyl or methyl 2-amino-isonicotinate give rise to the formation of two coordination polymers (CPs) based on double zig-zag Cu2 I2 chains. The presence of a NH2 group in the isonicotinate ligand produces different supramolecular interactions affecting the Cu-Cu distances and symmetry of the Cu2 I2 chains. These structural variations significantly modulate their physical properties. Thus, both CPs are semiconductors and also show reversible thermo/mechanoluminescence. X-ray diffraction studies carried out under different temperature and pressure conditions in combination with theoretical calculations have been used to rationalize the multi-stimuli-responsive properties...
November 7, 2018: Chemical Science
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