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Thermal properties

Jingyi Yan, Jinshan Yang, Shaoming Dong, Kai Huang, Jing Ruan, Jianbao Hu, Haijun Zhou, Quan Zhu, Xiangyu Zhang, Yusheng Ding
Organisms inspire us to enhance macroscale performance by utilizing the anisotropic properties of one dimensional (1D) nanomaterials. This work reports a bioinspired anisotropic nanocomposite by polar solution assisted mechanical stretching method, consisting of polyvinyl alcohol (PVA) and silicon carbide nanowires (SiCNWs) with aligned morphology in one direction. The design of myofibers-like structure is based on the highly-aligned SiCNWs and PVA chains that interact in the form of intermolecular force. Highly-aligned PVA acts as flexible linear chain for its special zigzag structure, and SiCNWs can be considered as stiff linear chain...
March 22, 2019: Nanotechnology
Petronela Pascariu, Corneliu Cojocaru, Niculae Olaru, Petrisor Samoila, Anton Airinei, Maria Ignat, Liviu Sacarescu, Daniel Timpu
Synthesis and characterization of novel ZnO:RE nanostructured materials doped with 1% rare-earth elements (RE = La, Er, Sm) and their testing for photocatalytic applications were reported. The materials were obtained via electrospining, followed by calcination at 700 ° C. The samples were characterized in terms of surface morphology (SEM, TEM), crystalline structure (XRD) and band gap energies. TEM results showed the formation of a unidimensional structure (ZnO) with an average fiber diameter of 600 nm and a morphology consisting of interconnected nanoparticles having dimensions in the range 25-134 nm (ZnO doped with RE)...
March 19, 2019: Journal of Environmental Management
Jie Li, Yingyun Qiao, Peijie Zong, Song Qin, Chengbiao Wang, Yuanyu Tian
This study aimed at investigating fast pyrolysis behavior and products distribution of two typical coastal zone biomass fuels (Jerusalem artichoke stalk (JAS) and reeds (Re) by TGA and a homemade down tube reactor. The kinetic analysis with different ramping rates was conducted by FWO and DAEM models. The liquid, gaseous and solid products are characterized to study the influence of temperature. Results indicate that high heating rates may be overcome some resistances to mass or heat transfer inside the particles of biomass, and lead to a higher conversion rates and Re species is preferable to JAs in terms of thermochemical conversion because of the lower apparent activation energy for total conversion...
February 21, 2019: Bioresource Technology
Shuilai Qiu, Bin Zou, Haibo Sheng, Wenwen Guo, Junling Wang, Yuyu Zhao, Wei Wang, Richard K K Yuen, Yongchun Kan, Yuan Hu
Owing to its mechanical performance, thermal stability, and size effects, the single or few-layer black phosphorus (BP) has potential to prepare the polymer nanocomposites as a candidate of nano-additives, similar to graphene. The step to realize the scalable exfoliation of single or few-layer BP nanosheets is crucial to BP applications. Herein, we utilized a facile, green and scalable electrochemical strategy for generating cobaltous phytate functionalized BP nanosheets (BP-EC-Exf) where the BP crystal used as the cathode, phytic acid served as modifier and electrolyte simultaneously...
March 22, 2019: ACS Applied Materials & Interfaces
Boris Apter, Nadezda Lapshina, Amir Handelman, Gil Rosenman
Basic optical properties of bioinspired peptide nanostructures are deeply modified by thermally mediated refolding of peptide secondary structure from α-helical to β-sheet. This conformational transition is followed by the appearance in the β-sheet structures of a wideband optical absorption and fluorescence in the visible region. We demonstrate that a new biophotonic effect of optical waveguiding recently observed in peptide/protein nanoensembles is a structure-sensitive bimodal phenomenon. In the primary α-helical structure input, light propagates via optical transmission window demonstrating conventional passive waveguiding, based on classical optics...
March 21, 2019: Journal of Peptide Science: An Official Publication of the European Peptide Society
Tan Sui, Enrico Salvati, Hongjia Zhang, Kirill Nyaza, Fedor S Senatov, Alexei I Salimon, Alexander M Korsunsky
Polylactide (PLA)-hydroxyapatite (HAp) composite components have attracted extensive attentions for a variety of biomedical applications. This study seeks to explore how the biocompatible PLA matrix and the bioactive HAp fillers respond to thermo-mechanical environment of a PLA-HAp composite manufactured by 3D printing using Fused Filament Fabrication (FFF). The insight is obtained by in situ synchrotron small- and wide- angle X-ray scattering (SAXS/WAXS) techniques. The thermo-mechanical cyclic loading tests (0-20 MPa, 22-56 °C) revealed strain softening (Mullins effect) of PLA-HAp composite at both room and elevated temperatures (<56 °C), which can be attributed primarily to the non-linear deformation of PLA nanometre-scale lamellar structure...
March 2019: Journal of Advanced Research
Guolin Yun, Shi-Yang Tang, Shuaishuai Sun, Dan Yuan, Qianbin Zhao, Lei Deng, Sheng Yan, Haiping Du, Michael D Dickey, Weihua Li
Conductive elastic composites have been used widely in soft electronics and soft robotics. These composites are typically a mixture of conductive fillers within elastomeric substrates. They can sense strain via changes in resistance resulting from separation of the fillers during elongation. Thus, most elastic composites exhibit a negative piezoconductive effect, i.e. the conductivity decreases under tensile strain. This property is undesirable for stretchable conductors since such composites may become less conductive during deformation...
March 21, 2019: Nature Communications
Yi Huang, Yu Jiang, Zhaofei Ma, Yan Zhang, Xianfeng Zheng, Xuemin Yan, Xiaoqing Deng, Wei Xiao, Haolin Tang
WS₂ is considered as a potential anode material for lithium ion batteries (LIBs) with superior theoretical capacity and stable structure with two-dimensional which facilitates to the transportation and storage of lithium ion. Nevertheless, the commercial recognition of WS₂ has been impeded by the intrinsic properties of WS₂, including poor electrical conductivity and large volume expansion. Herein, a seaweed-liked WS₂/reduced graphene oxide (rGO) composites has been fabricated through a procedure involving the self-assembling of WO₄2- , hexadecyl trimethyl ammonium ion with graphene oxide (GO) and the subsequent thermal treatment...
March 20, 2019: Nanomaterials
Yi Yang, Jing Cao, Ning Wei, Donghui Meng, Lina Wang, Guohua Ren, Rongxin Yan, Ning Zhang
In this paper, the thermal properties of graphene oxide (GO) with vacancy defects were studied using a non-equilibrium molecular dynamics method. The results showed that the thermal conductivity of GO increases with the model length. A linear relationship of the inverse length and inverse thermal conductivity was observed. The thermal conductivity of GO decreased monotonically with an increase in the degree of oxidation. When the degree of oxidation was 10%, the thermal conductivity of GO decreased by ~90% and this was almost independent of chiral direction...
March 20, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Jiajun Wang, Bo Wang, Junliang Liu, Lin Ni, Jianzhang Li
This study aimed to improve straw-based fiberboard properties without resins by adding pulping effluent as well as to investigate the difference among boards under variable hot-pressing temperatures. The characterization of fiberboards produced from wheat straw under pressing temperatures ranging from 160 to 200 °C was first described. The surface appearance, surface chemistry, thermal transitions, and mechanical performance of the boards were evaluated to investigate the effect of varying hot-pressing temperature...
March 20, 2019: Materials
Lingbo Xing, Zhantao Peng, Wentao Li, Kai Wu
Molecular self-assembly (MSA) refers to spontaneous arrangement of molecular building blocks into ordered structures governed by weak interactions. Due to its high versatility and reversibility, MSA has been widely employed as a robust bottom-up approach to fabricating low-dimensional functional nanostructures, which are used in various applications in nanoscience and technology. To date, tremendous effort has been devoted to constructing various MSAs at surfaces, ranging from self-assembled monolayers and two-dimensional (2D) nanoporous networks to complex 2D quasicrystals and Sierpiński triangle fractals...
March 21, 2019: Accounts of Chemical Research
Youichi Tsuchiya, Koudai Ikesue, Hajime Nakanotani, Chihaya Adachi
Organic nanoparticles (O-dots) with a high photoluminescence quantum yield (94%) and long-lived delayed emission (3.1 μs) originating from thermally activated delayed fluorescence (TADF) were developed as glassy state particles using an oil in water emulsion under high pressure (<20 bar). The TADF glassy O-dots exhibit not only good dispersibility and high photostability in water but also good uptake properties into living cells. The glassy O-dots will open new uses as organic emitters in biological applications...
March 21, 2019: Chemical Communications: Chem Comm
David B Brown, Wenqing Shen, Xufan Li, Kai Xiao, David B Geohegan, Satish Kumar
Improving the thermal transport across interfaces is a necessary consideration for micro- and nano-electronic devices and necessitates accurate measurement of the thermal boundary conductance (TBC) and understanding of transport mechanisms. Two-dimensional transition metal dichalcogenides (TMDs) have been studied extensively for their electrical properties, including the metal-TMD electrical contact resistance, but the thermal properties of these interfaces are significantly less explored irrespective of their high importance in their electronic devices...
March 21, 2019: ACS Applied Materials & Interfaces
Liya Qiu, Chengfeng Yu, Xiaoling Wang, Yangbin Xie, Alexander M Kirillov, Wei Huang, Jipeng Li, Peng Gao, Ting Wu, Xiangwei Gu, Qi Nie, Dayu Wu
Postsynthetic modification represents an efficient strategy for the fabrication of tunable metal-organic frameworks (MOFs) and derived high-performance functional materials. Herein, we report the synthesis of a mixed-linker zinc(II)-based double-layered MOF (dlMOF) with dual-emissive luminescence, which was further applied as a host matrix to fabricate highly tunable Ln@dlMOF materials (Ln = Eu, Tb, Eu/Tb). The emission characteristics of these materials can be readily modulated over a wide spectrum, including white light emission, by simply tuning the Eu3+ /Tb3+ molar ratio in EuTb@dlMOF...
March 21, 2019: Inorganic Chemistry
Xiaomin Zhang, Wenliang Li, Yiran Guan, Baolei Zhou, Jingping Zhang
A novel type of ionic covalent organic frameworks (ICOFs) with spiroborate linkage has been recently designed and synthesized by Zhang and coworkers. The spiroborate-linked ICOFs exhibit high BET surface areas and significant amount of H2 and CH4 uptakes, combined with excellent thermal and chemical stabilities. Inspired by the novel properties of the ICOFs, with the aim to gain better understanding on the structure of such spiroborate-linked ICOFs, a series of potential 3D network configurations of ICOFs connected with tetrahedral [BO4]- node were proposed, assuming the [BO4]- node in spiroborate segments takes a tetrahedral configuration...
March 21, 2019: Chemistry: a European Journal
Rongbin Cui, Fan Zhu
BACKGROUND: Sweetpotato (Ipomoea batatas Lam.) is a major starchy crop with great agricultural significance in many countries. There is a need to assess more genetic resources for sweetpotato quality improvement. This study aims to analyze physicochemical properties of whole (unpeeled) root flours from 7 New Zealand sweetpotato varieties with commercial significance. Using whole unpeeled plants for "healthy" food formulations becomes more popular due to nutritional effects and environmental concerns...
March 20, 2019: Journal of the Science of Food and Agriculture
Elena L A Malpezzi-Marinho, Graziela R Molska, Lyvia I G P Freire, Cristiane I Silva, Eduardo K Tamura, Laís F Berro, Carlos A Parada, Eduardo Ary Villela Marinho
BACKGROUND: Solidago chilensis (syn. microglossa) is a plant from the Asteraceae family widely distributed in South America and used to treat inflammatory diseases. In 2009, it was listed as one of the native medicinal herbal plants used in the Brazilian public health system. In addition to its anti-inflammatory properties, a recent clinical study has shown antinociceptive effects of S. chilensis, introducing a new potential medical use for this plant. The aim of the present study was to investigate the antinociceptive activity of the hydroalcoholic extract of Solidago chilensis (HESc) in rodent models of pain...
March 20, 2019: BMC Complementary and Alternative Medicine
Joanna Szafraniec, Agata Antosik, Justyna Knapik-Kowalczuk, Krzysztof Chmiel, Mateusz Kurek, Karolina Gawlak, Joanna Odrobińska, Marian Paluch, Renata Jachowicz
The self-assembly phenomenon of amphiphiles has attracted particular attention in recent years due to its wide range of applications. The formation of nanoassemblies able to solubilize sparingly water-soluble drugs was found to be a strategy to solve the problem of poor solubility of active pharmaceutical ingredients. Binary and ternary solid dispersions containing Biopharmaceutics Classification System (BCS) class II drug bicalutamide and either Poloxamer® 188 or Poloxamer® 407 as the surface active agents were obtained by either spray drying or solvent evaporation under reduced pressure...
March 19, 2019: Pharmaceutics
Jaber E Abu Qudeiri, Ahmad Saleh, Aiman Ziout, Abdel-Hamid I Mourad, Mustufa Haider Abidi, Ahmed Elkaseer
Electric discharge machining (EDM) is a material removal process that is especially useful for difficult-to-cut materials with complex shapes and is widely used in aerospace, automotive, surgical tools among other fields. EDM is one of the most efficient manufacturing processes and is used to achieve highly accurate production. It is a non-contact thermal energy process used to machine electrically conductive components irrespective of the material's mechanical properties. Studies related to the EDM have shown that the process performance can be considerably improved by properly selecting the process material and operating parameters...
March 19, 2019: Materials
Sergi Montava-Jordà, Sergio Torres-Giner, Santiago Ferrandiz-Bou, Luis Quiles-Carrillo, Nestor Montanes
This study presents the valorization of cotton waste from the textile industry for the development of sustainable and cost-competitive biopolymer composites. The as-received linter of recycled cotton was first chopped to obtain short fibers, called recycled cotton fibers (RCFs), which were thereafter melt-compounded in a twin-screw extruder with partially bio-based polyethylene terephthalate (bio-PET) and shaped into pieces by injection molding. It was observed that the incorporation of RCF, in the 1⁻10 wt% range, successfully increased rigidity and hardness of bio-PET...
March 19, 2019: International Journal of Molecular Sciences
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