Quasi-adiabatic decay of vortex motion on the water surface
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): Sergei Filatov, Alexandr Levchenko, Anatolii Likhter, Leonid Mezhov-DeglinAbstractThe decay of the developed energy cascade of vortex motion on the water surface excited by perpendicular standing waves at a frequency of 6 Hz is investigated experimentally. It is shown that after the pumping is switched off, the relaxation process begins from the large wave vectors k and occurs in the quasi-adiabatic mode: the Kolmogorov energy distribution proportional to k−5/3 is maintained for a long time due to the nonlinear interaction of vortices....
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

In-situ synthesis of CdS quantum dots on CdCO3 cubic structure for enhanced photocatalytic hydrogen production performance
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Weibing Li, Jing Han, Yijiang Wu, Qingyue Xiang, Yu Qiao, Chang Feng, Zhuoyuan Chen, Xiaoyan DengAbstractThe CdCO3 cubic structure was firstly synthesized by hydrothermal method. Then CdS quantum dots (QDs) were in-situ deposited on the CdCO3 to form CdCO3/CdS QDs composite photocatalyst to explore its photocatalytic hydrogen production performance. Physical characterization results show that cubic CdCO3 consists of nanoflake structures, and CdS QDs are uniformly dispersed on the surface of CdCO3 nanoflakes to form heterostructures. Under vis...
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

Production of PMMA-based nanocellular polymers using low demanding saturation conditions
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Victoria Bernardo, Judith Martín-de León, Miguel Ángel Rodríguez-PérezAbstractNanocellular polymers are novel materials characterized by nanometric cell sizes with huge potential in many industrial applications. However, their production is challenging and usually requires demanding processing conditions that make difficult the production at industrial scale. In this work, we prove that nanocellular polymers based on PMMA can be obtained, thanks to the addition of nucleating species, using low saturation pre...
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

Effect of hot isostatic pressing (HIP) treatment on the compressive properties of Ti6Al4V lattice structure fabricated by selective laser melting
In this study, the compressive properties of selective laser melted (SLM) Ti6Al4V lattice structure were studied. Based on results and discussion, it was found that hot isostatic pressing (HIP) treatment significantly influenced the microstructure and compressive properties of the SLM Ti6Al4V lattice structure. HIP resulted in a transformation of acicular α′ martensite in the AF sample into a mixture of α and β lathes and a simultaneous reduction of internal porosity from 5.9% in the AF state to 0.5% after HIP treatment. As a consequence, the HIP samples exhibited significantly improved compressive s...
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

Indocyanine green (ICG) – Menthol loaded cerasomal nanoparticles for ultrasound imaging and photothermal therapy against tumor
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Xi Yang, Chunan Wang, Mengli Ding, Chunyang Zhang, Wei Wang, Zhong CaoAbstractMultifunctional ultrasound contrast agents (UCAs) combining ultrasonic diagnosis with tumor therapy have received enormous attentions in virtue of their good biocompatibility and high biological penetration ability. However, nanoscale UCAs with suitable size and good therapeutic effect remain to be developed in future studies. Herein, indocyanine green and L-menthol loaded hybrid cerasomes (ICG-MCNs) was fabricated as a multifunctional theranostic nanoplatform, whic...
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

Effect of Zn-brazed-interface on microstructures and mechanical properties of dissimilar 2A12/AZ31 alloys friction stir lap welds
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Huaibo Deng, Yuhua Chen, Timing Zhang, Shanlin Wang, Limeng Yin, Jilin XieAbstractTo improve the mechanical behavior of dissimilar Al/Mg joints, Zn foil, as a brazing filler, was added to the Al/Mg interface when conducting friction stir lap welding with 2A12/AZ31 alloys. Results showed that new phases, such as Mg0.97Zn0.03, Al0.403Zn0.597 and MgZn2, rather than the continuous brittle Al12Mg17 intermetallic compound (IMC), are formed in the brazing area. At a rotation speed of 375 rpm and a travel speed of 30 mm/min, the tensile shear loa...
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

Facile design of nitrogen-doped reduced graphene oxide/zinc ferrite hybrid nanocomposites with excellent microwave absorption in the X-band
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Ruiwen Shu, Jiabin Zhang, Yue Wu, Zongli Wan, Mingdong ZhengAbstractHerein, nitrogen-doped reduced graphene oxide/zinc ferrite (NRGO/ZnFe2O4) hybrid nanocomposites were synthesized through a facile one-pot hydrothermal strategy by using graphene oxide (GO) as a substrate. Results demonstrated that the additive amounts of GO had remarkable influence on the micromorphology and microwave absorption properties of NRGO/ZnFe2O4 hybrid nanocomposites. The as-prepared hybrid nanocomposites showed good dispersion of nanoparticles as the additive amoun...
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

Zn-doped FeOOH-polypyrrole electrodes for supercapacitors
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): W. Liang, R. Poon, I. ZhitomirskyAbstractThe problem of poor cyclic stability of FeOOH anodes for supercapacitors was addressed by Zn-doping. Zn-doped FeOOH materials exhibited significant improvement in capacitance retention during cycling. Further improvement in capacitance retention and capacitive properties at low absolute values of negative potentials was achieved in composites containing Zn-doped FeOOH and polypyrrole-coated carbon nanotubes. Another important finding was a simple procedure for the fabrication of MnO2 cathodes, which av...
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

Improvement of electrochemical properties of activated carbon hollow fibers from liquefied wood by charcoal power
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Liyan Ma, Jianing Li, Xiaojun MaAbstractA series of activated carbon hollow fibers doped with charcoal powder (WC-ACHFs) were prepared from wood waste by liquefaction, melt spinning and steam activation methods. When evaluated as electrodes, activated carbon hollow fibers doped with charcoal powder exhibited an outstanding gravimetric specific capacitance of 481 F g−1 at 0.5 A g−1 and cyclic stability with 98.8% capacitance retention over 2000 cycles. In addition, the multiple heteroatoms-doping of N and P from w...
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

Improved strength and enhanced pitting corrosion resistance of Al-Mn alloy with Zr addition
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Cheng Cao, Dengbin Chen, Jieke Ren, Jianguo Shen, Liang Meng, Jiabin LiuAbstractAutomotive heat exchanger materials with high strength and excellent corrosion resistance performance are highly required due to the increasing demands of weight reduction and fuel economy. In this work, 0.16 wt% Zr was added into a Al-1.5Mn-0.3Fe-0.6Si-0.5Cu(wt.%) alloy for the improvement of the related performance. The microstructure, mechanical properties and electrochemical properties were investigated. The results indicate that Zr addition can decrease gra...
Source: Materials Letters - August 24, 2019 Category: Materials Science Source Type: research

Hybrid carbon nanotubes/graphene/nickel fluffy spheres for fast magnetic separation and efficient removal of organic solvents from water
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): Tao Tao, Guangyao Li, Yanli He, Pengzheng DuanAbstractCarbon nanotubes/graphene/nickel (CNT-G-Ni) fluffy spheres were synthesized using renewable carbon sources. Carbon-encapsulated nickel nanoparticles (CENNs) were prepared by hydrothermal carbonization (HTC) of potato starch and nickel nitrate, and then followed by catalytic graphitization at 900 °C. The prepared GENNs were cracked at 700 °C in biogas, during which graphene shells over GENNs were peeled off and formed graphene nanoplatelets, and simultaneously multiwall carbon na...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Effect of nanoimprint on the elastic modulus of polymer microstructure
In this study, nanoindentation was employed to quantitatively characterize the elastic modulus of nanoimprinted poly(methyl methacrylate) (PMMA) under different conditions, with the purpose to investigate the mechanical property of the nanoimprinted microstructure suffered the ultra-high local stress and temperature. It is indicated that the elastic modulus of samples increases with the increasing the residual stress and the nanoimprint temperature. Moreover, the optical birefringence method was performed to investigate the distribution of residual stress on the microstructure. It was shown that high elastic modulus region...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Controllable synthesis of polyhedral Au@Co3O4 electrode for high performance supercapacitors
In this study, due to the large cavity structure of the metal-organic frameworks (MOFs), Au@ZIF-67 was synthesized by loading nanoscale Au nanoparticles (NPs) into Co based zeolite imidazole framework (ZIF-67). Subsequently, Au@ZIF-67 was calcined to produce Au NPs loading Co3O4 hollow nanocages (Au@Co3O4). The small size Au NPs were distributed on the wall of Co3O4 hollow nanocages. The final product in a polyhedral morphology formed hollow nanocages. The unique structure could provide a high specific surface area. As an electrode material of supercapacitors, the Au@Co3O4 electrode with polyhedral morphology showed a spec...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Zn2SiO4 as an ultralow solar absorptive pigment for thermal control coating
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Meihua Fang, Jinpeng LvAbstractPassive thermal control coatings (TCCS) have been widely used to tune the thermal equilibrium of spacecraft. However, the performance of such coatings undergoes serious degradation due to the intensive UV absorption and the radiation damage of the pigments. We developed a Zn2SiO4 pigment with a solar absorptance (αs) as low as 0.078, which shows a distinctly high reflectance in the whole solar-radiation spectrum, especially in the high energy UV wavebands. Furthermore, after performing proton irradiation, ...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Facile synthesis of three-dimensional carbon nanotube/Fe3O4 microspheres as sulfur host for high performance lithium-sulfur batteries
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Baoe Li, Zhenghao Sun, Yan Zhao, Zisheng ZhangAbstractLithium-sulfur batteries were considered as a new generation of high energy density batteries, but their commercialization was limited by volume expansion, the low conductivity of sulfur and shuttle effect. To overcome these issues, we developed a three-dimensional carbon nanotube/Fe3O4 microspheres via spray drying and calcination as sulfur host materials (S/CNT/Fe3O4). In this three-dimensional microsphere structure, interwoven CNT backbone offers a robust conductive network with suffici...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Improved cycle durability of hydrogen absorption and desorption in melt-spun Mg86Pr3Al11 alloy
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Jia Zhou, Qingan ZhangAbstractIn this work, the hydrogen absorption and desorption properties of a melt-spun Mg86Pr3Al11 alloy were studied using a Sieverts-type apparatus. It was found that the melt-spun Mg86Pr3Al11 alloy exhibits an enhanced cycle durability of hydrogen absorption and desorption. After fifty hydrogen absorption and desorption cycles at 300 °C, the capacity retention rate is about 97% and the hydrogen sorption kinetics undertakes only a slight degradation, which is related to the existence of PrAl2 and Pr3Al11 phases i...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Interfacial charge-transfer transitions enhanced photocatalytic activity of TCNAQ/g-C3N4 organic hybrid material
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Hairui Huang, Zhijie Zhang, Shaoke Guo, Kun Cheng, Jiayue Xu, Na ZhangAbstractGraphitic carbon nitride (g-C3N4) photocatalyst has a promising application prospect in solving environment problems and energy crisis. In order to improve the photocatalytic activity of g-C3N4, a novel TCNAQ/g-C3N4 organic hybrid photocatalyst was designed by introducing 11,11,12,12-tetracyanonaphtho-1,4-quinodimethane (TCNAQ) as an electron acceptor. Due to the interfacial charge-transfer transitions between g-C3N4 donor and TCNAQ acceptor, separation and migratio...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Modulation of structure and mechanical properties of self-assembled peptide nanofibrils and nanosheets
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Hangshuai Jin, Liwei Zhang, Yongxiu Song, Lei LiuAbstractThe modulation of peptide based nanostructure and the mechanical property is of significance in various areas, such as in biomaterial science, tissue engineering, etc. However, how to regulate the peptide based nanostructure from 1D to 2D and the mechanical property is rarely to explore. Herein, we constructed amphiphilic-like peptide (KFAK) to form nanostructure from 1D fibril to 2D sheet, and the nanomechanical properties changed during the modulation. The peptide based fibril was muc...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Synthesis and characterization of carbonated hydroxyapatite with layered structure
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Weiteng Kong, Ke Zhao, Chunxia Gao, Peizhi ZhuAbstractLayered carbonated hydroxyapatite (LCHA) was prepared by hydrothermal method under high concentration of carbonate ions. The crystallinity and chemical structure of synthesized LCHA with novel layer by layer structure was studied by Fourier transform infrared spectroscopy, X-ray diffraction, X-ray Photoelectron Spectroscopy and scanning electron microscopy. The biocompatibility and bioactivity of synthesized LCHA were determined by CCK-8 and Live/Dead staining assay. The experimental resul...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Nanoflakes-assembled 3D flower-like nickel hydroxidenitrate as a highly efficient electrocatalyst for water oxidation
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Quande Che, Yujie He, Qian Ma, Junpeng Wang, Gang Wang, Yuanna Zhu, Ruixia Shi, Ping YangAbstractThis paper reports a nanoflakes-assembled 3D flower-like nickel hydroxidenitrate (NiNH) and its application in water oxidation. It is demonstrated for the first time that the NiNH is an efficient oxygen evolution reaction (OER) electrocatalyst in alkaline solution. Specifically, it can drive a current density of 10 mA cm−2 at a fairly low overpotential of 280 mV and a correspondent small Tafel slope of 39.6 mV dec−1. The impres...
Source: Materials Letters - August 22, 2019 Category: Materials Science Source Type: research

Graphene composite plastic film as current collector for aluminum-graphite batteries
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): Yu Wang, Fangyu Gan, Kanghua ChenAbstractThe use of rare metals as current collectors in aluminum-ion batteries is an urgent problem to be solved, so there are significant interests in the development of light-weight and high-efficiency materials as current collector. Herein, we report a polyvinyl-alcohol/graphene composite film as current collector in aluminum-ion batteries which synthesized by a simple solution method. The film containing 20 wt% graphene demonstrates high electrical conductivity up to 164S·cm−1 with ∼30 ...
Source: Materials Letters - August 21, 2019 Category: Materials Science Source Type: research

Synthesis of nitrogen-doped carbon nanocages for sensitive electrochemical detection of uric acid
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Ruiyu Han, Jing Ma, Chaoju Yang, Tong Cui, Wenjiao Liu, Shusong WangAbstractIn this work, nitrogen-doped carbon nanocages were prepared for uric acid detection, which exhibits three dimensional hollow nanostructures with large specific surface area of 565 m2 g−1 and unique heteroatomic property. The as-synthesized nitrogen-doped carbon nanocages show high selectivity and sensitivity for uric acid detection accompanied with excellent stability. The developed electrochemical analysis for facile determination of uric acid shown a wide ...
Source: Materials Letters - August 18, 2019 Category: Materials Science Source Type: research

High thermally stable multi-layer steel/vanadium alloy hybrid material obtained by high-pressure torsion
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): S.O. Rogachev, V.M. Khatkevich, S.A. Nikulin, M.V. Ignateva, A.A. GromovAbstractA comparative analysis of the thermal stability of the steel/vanadium alloy hybrid material and its components (steel type AISI 439 and V–10Ti–5Cr alloy) obtained by high-pressure torsion (HPT) at 20 and 400 °C was carried out. It has been established that the steel/vanadium alloy hybrid obtained by HPT at 20 °C has a higher thermal stability up to a temperature of 700 °C compared to the hybrid obtained by HPT at 400 °C and with...
Source: Materials Letters - August 18, 2019 Category: Materials Science Source Type: research

Phase separation and its effect on atomic interactions in CoCrNiCux medium-entropy alloys
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Dennis Edgard Jodi, Nokeun ParkAbstractHerein, the phase separation phenomenon and its effect on the atomic interactions of CoCrNiCux (x = 0, 0.33, 0.66, 1 in molar ratio) medium-entropy alloys were investigated. Phase alteration from single solid-solution face-centered cubic (FCC) phase to Cu-lean FCC1 and Cu-rich FCC2 structures was observed when Cu was added. This occurred due to the positive mixing enthalpy of Cu with other constituents, causing higher Gibbs free energy of mixing with increasing Cu content. This phase separation also ...
Source: Materials Letters - August 18, 2019 Category: Materials Science Source Type: research

Probing the role of deposition time in tuning the physico-chemical, optoelectronic performance of Cu2SnS3 thin films
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Monika P. Joshi, Popatrao N. BhosaleAbstractTime dependent Cu2SnS3 (CTS) thin films have been synthesized by simplistic arrested precipitation technique (APT) via restricted release of ions from metal complex and used as potential photocathode for photovoltaic application. The influences of deposition time on physico-chemical, optoelectronic performance have been studied for the first time. With progress in reaction time decrement in optical band gap from 1.94 to 1.75 eV was noticed. XRD & Raman analysis verified that CTS crystallize in...
Source: Materials Letters - August 18, 2019 Category: Materials Science Source Type: research

A study on the effects of the number of layers of graphene for flow-induced power generation on graphene/polyetrafluoroethylene membranes
We report generation of flow-induced electrical voltage and current associated with changing numbers of graphene layers in graphene surfaces prepared on PTFE (polytetrafluoroethylene) substrates by moving an ionic droplet of NaCl to investigate the effects of pseudocapacitance phenomena between each graphene surface and the ionic solution. Each sample exhibited different surface energies and electrical ionic double layers on the graphene surface. For each sample, these properties were evaluated by water contact angle measurements and Raman spectra, respectively. Additionally, we demonstrated changes in flow-induced voltage...
Source: Materials Letters - August 18, 2019 Category: Materials Science Source Type: research

A transparent photovoltaic device based on Cu2O/ZnO/AZO for see-through applications
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Amit Kumar Rana, Dong-Kyun Ban, Malkeshkumar Patel, Ju-Hyung Yun, Joondong KimAbstractThe present study shows the energy harvesting ability from a transparent Cu2O/ZnO/AZO heterojunctions device. Particularly, the electron selective AZO/ZnO and hole selective Cu2O enables the formation of photovoltaic behaviour with a VOC of 0.52 V. It is demonstrated that even with high transparency of the photoactive oxide layers of ∼80%, the device shows the maximum conversion efficiency of ∼0.70% depending on the incoming photon intensity. In ad...
Source: Materials Letters - August 18, 2019 Category: Materials Science Source Type: research

Direct formation of carbon supported Pt nanoparticles by plasma-based technique
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): HuJun Xu, ChaoHong He, LiangLiang Lin, Jie Shen, ShaoMing ShangAbstractA conceptually new method based on plasma-electrochemical technique is demonstrated for the one-step synthesis of carbon supported Pt nanoparticles. Ethanol and chloroplatinic acid aqueous solution were used as the carbon and platinum sources, respectively, without involving any extra chemicals. Results showed that crystalline Pt nanoparticles as well as amorphous nanocarbons could be simultaneously generated to form Pt/C nanocomposites under the plasma impact, where the P...
Source: Materials Letters - August 16, 2019 Category: Materials Science Source Type: research

Evolution of Al-Si-Mn-Fe aluminum alloy microstructure in the equal-channel angular pressing with back pressure
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): Violetta AndreyachshenkoAbstractThe evolution of the aluminum alloy of the A3xx Al-Si-Mn-Fe series in the equal-channel angular pressing with back pressure with the strain of 0.75 per cycle has been carried out. After preliminary annealing dispersed inclusions of three types have been observed in the alloy: rod-like particles, planar-shaped rounded forms, and silicon particles. Two parallel grain refining schemes have been detected that ensure grinding the grains to the size of about 1 μm and smaller than 150 nm after the 1.5 degree of ...
Source: Materials Letters - August 15, 2019 Category: Materials Science Source Type: research

Enhancing mechanical and biodegradation properties of polyvinyl alcohol/silk fibroin nanofibers composite patches for Cardiac Tissue Engineering
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Mostafa M. Sayed, Hamouda M. Mousa, M.R. El-Aassar, Nehal M. El-Deeb, Nouby M Ghazaly, Montasser M. Dewidar, Abdalla Abdal-hayAbstractA biodegradable polyvinyl alcohol/silk fibroin (PVA/SF) nanofibrous heart patch with unique tensile properties was fabricated by an electrospinning technique based on a water-solvent system. The fabricated heart patches were exposed to 2% Glutaraldehyde vapor to provide a cross-linkage and tune the degradation behavior. Numerous characterizations of the modified PVA/SF patches such as surface morphology, chemic...
Source: Materials Letters - August 15, 2019 Category: Materials Science Source Type: research

Carbon Assisted Methylammonium Lead Iodide Microcrystalline Device for an Inexpensive Self-Powered Photodetector
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): Sunjay Murali, Sreejith P. Madhusudanan, Amit K. Pathak, P.M. Jayasankar, Sudip K. BatabyalAbstractOrganometallic halide perovskite as Methyl Ammonium Lead iodide (MAPbI3) is the basis of current focus of solar energy materials research. Here we report acetophenone assisted pure phase MAPbI3 powder crystals synthesis for fabrication of inexpensive self-powered photodetector. The as fabricated photodetector ascertain, response time of 200 ms with detectivity ∼8.2 × 1011 jones at zero bias voltage and the SNR ∼4 × 1...
Source: Materials Letters - August 13, 2019 Category: Materials Science Source Type: research

Simultaneously enhancing mechanical properties and damping capacity of pure titanium subjected to cryogenic laser peening
In this study, the effects of cryogenic laser peening (CLP) on mechanical properties and damping capacity of pure titanium (Ti) were explored. The experimental results showed that CLP improved the tensile properties and in-depth microhardness of pure Ti, while the compressive residual stress was introduced in the surface layer. Meanwhile, the damping ratio was also increased after CLP process. The synergistic strengthening effect of CLP could effectively accelerate the formation of deformation twin, which contributed to the simultaneous improvement in mechanical properties and damping capacity of pure Ti. (Source: Materials Letters)
Source: Materials Letters - August 12, 2019 Category: Materials Science Source Type: research

Two pass laser welding of TC4 titanium alloy and 304 stainless steel using TA2/Q235 composite interlayer
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): YiDi Gao, JianPing Zhou, Yan Zhang, DaQian Sun, HongMei LiAbstractIn this work, TA2/Q235 was used as an composite interlayer to prevent the formation of these brittle Ti-Fe intermetallics when joining TC4 Ti alloy to 304 stainless steel (SS). The TA2/Q235 composite interlayer was prepared by explosive welding. The laser was focused on the TC4-TA2 interface, which joined the TC4 and TA2 by fusion welding. At TC4-TA2 interface, a weld zone was formed due to the mixing of molten TC4 and TA2. The laser was focused on the Q235-304 SS interface, a ...
Source: Materials Letters - August 12, 2019 Category: Materials Science Source Type: research

Microstructure and properties of GR2 titanium treated by plasma-pulsed detonation
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Junming Luo, Yuhai Chen, Linwei Zhang, Deping Lu, Jilin XuAbstractThe modified layers were prepared on the GR2 titanium by plasma-pulsed detonation technology (PPD) in the compressed air (Air), argon (Ar) and nitrogen (N2) atmospheres, respectively. We observed that the modified layer was composed of TiN, TiN0.3, TixOy and Ti phases. The second phase strengthening, the fine grain strengthening and the dislocations strengthening are the main reasons for the improvement of wear resistance. Compared with the substrate, all modified layers have l...
Source: Materials Letters - August 12, 2019 Category: Materials Science Source Type: research

α-Glucosidase inhibitory activity of mangiferin-loaded F127/PEG micellar system
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Francisco W.A. Bezerra, Lillian M.U.D. Fechine, Karen P.S. Lopes, Anderson F. de Sousa, Gerlan O. do Nascimento, Hilmara H. de S. Amaral, Luzia K.A.M. Leal, Maria T.S. Trevisan, Maria E.N.P. Ribeiro, Nágila M.P.S. RicardoAbstractMangiferin-loaded F127/PEG micellar systems were evaluated regarding the effect of PEG addition at different molecular weights, where the system with best mangiferin solubility response (0.5 wt% of PEG in 1 wt% F127 aqueous solution) was chosen to be a potential drug delivery system (DDS), which solubilized...
Source: Materials Letters - August 12, 2019 Category: Materials Science Source Type: research

Rapid synthesis of metal-organic frameworks MIL-53(Cr)
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Xin Li, Jin Zhang, Wanling Shen, Shutao XuAbstractMIL-53(Cr) is a well-known and important metal-organic framework material. However, the long synthesis time of MIL-53(Cr) restricts its applications. Herein, we report a facile method to kinetically modulate the crystallization route and decrease the synthesis time of 72 to only 8 h by simply increasing the usage of HF.Graphical abstract (Source: Materials Letters)
Source: Materials Letters - August 12, 2019 Category: Materials Science Source Type: research

In-situ X-ray tomography analysis of the evolution of pores during deformation of AlSi10Mg fabricated by selective laser melting
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Javad Samei, Maedeh Amirmaleki, Mohammad Shirinzadeh Dastgiri, Carlo Marinelli, Daniel E. GreenAbstractAlSi10Mg is an interesting structural material due to its high specific mechanical properties, and good weldability which makes it a good candidate for additive manufacturing by selective laser melting. In this paper, the evolution of pores is visualized and quantified in an AlSi10Mg fabricated by selective laser melting using in-situ tension coupled with X-ray computed tomography. Graphical models were produced in order to visualize the evo...
Source: Materials Letters - August 11, 2019 Category: Materials Science Source Type: research

Ultrahigh adsorption capacities of fluorescein sodium and Congo red achieved in mixed-halide [BiI3Cl2] and methylviologen dication
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): J. Wang, J. Zheng, S.T. Wang, J. Sun, Y.M. Guo, H. Wang, S.G. Huang, Y.D. Li, C.C. WangAbstractOrganic dye contaminants are becoming a worldwide challenge for water resources due to their non-natural degradation, highly toxic and carcinogenic. In this work, the molecular ferroelectric material (MV)[BiI3Cl2] synthesized by the solvothermal method was first applied to the adsorption of organic dye contaminants. Interestingly, the adsorption capacity of the (MV)[BiI3Cl2] powder was found to reach a high value of 793 and 10,476 mg g−1 fo...
Source: Materials Letters - August 11, 2019 Category: Materials Science Source Type: research

Equal channel angular bending as a new severe plastic deformation process: Application to thin Mg-3Al-1Zn sheet
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): S.F. Chen, H.W. Song, S.H. Zhang, M. Cheng, M.G. LeeAbstractA novel severe plastic deformation process (SPD), namely an equal channel angular bending (ECAB), was proposed and successfully applied to thin Mg-3Al-1Zn sheets. Results of microstructure characterization indicate that simultaneous activation of multiple types of twins can be introduced by ECAB, which can refine the grain and efficiently weaken the basal texture. Moreover, the dominant twin types in ECAB are found to be closely related to the imposed deformation paths of ECAB, and p...
Source: Materials Letters - August 11, 2019 Category: Materials Science Source Type: research

Enhanced piezoelectric properties of polyvinylidene fluoride nanofibers using carbon nanofiber and electrical poling
In this study, for the first time we report the combined impact of electrospinning, carbon nanofiber (CNF) addition and electrical poling in the polyvinylidene fluoride (PVDF) polymer on its beta phase transition and enhancement of piezoelectric effect. CNF (0.25%, 0.5%, 0.75% and 1% (w/w)) dispersed PVDF electrospun nanofibers were characterized for their morphology, functional group and electrical properties using SEM, FTIR, Raman, XRD and impedance analyzer. The developed nanofibers showed promising results in beta phase transition and 0.5% (w/w) CNF filled PVDF nanofibers were found to possess high beta phase crystals ...
Source: Materials Letters - August 11, 2019 Category: Materials Science Source Type: research

The novel 2D honeycomb-like NiO nanoplates assembled by nanosheet arrays with excellent gas sensing performance
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Jingxuan Wang, Qu Zhou, Zhaorui Lu, Zhijie Wei, Wen ZengAbstractHerein, we successfully prepared the Nickel oxide (NiO) nanomaterials with the structure of two-dimensional (2D) honeycomb-like nanoplates assembled by nanosheet arrays through the hydrothermal synthesis. In addition, the growth mechanism of this unusual nanostructure was proposed. Surprisingly, such NiO nanoplates exhibits superior gas-sensing properties to CO, which is mainly attributed to the hollow structure produced by the arrangement of nanosheets, contributing not only eno...
Source: Materials Letters - August 11, 2019 Category: Materials Science Source Type: research

Low temperature HFCVD synthesis of tungsten oxide thin film for high response hydrogen gas sensor application
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): Rhushikesh Godbole, Sadia Ameen, Umesh T. Nakate, M. Shaheer Akhtar, Hyung-Shik ShinAbstractA quick and efficient approach was employed for the growth of nanocrystalline tungsten oxide (WO3) thin films using one-step hot filament chemical vapor deposition (HFCVD) method at low temperature. In a typical experiment, the parent material tungsten (W) was subjected to oxidation, gasification and its subsequent condensation to obtain the uniform deposition of WO3 thin film on silicon substrate at significantly low temperature of ∼200 °C. P...
Source: Materials Letters - August 8, 2019 Category: Materials Science Source Type: research

Preparation and characterization of tough cerium hexaaluminate bodies
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): S.M. Naga, H.F. El-Maghraby, M. Awaad, F. Kern, R. Gadow, A.M. HassanAbstractThe present study aims to prepare cerium hexaaluminate (CeAl11O18) via a sol-gel technique and to study the effect of the phase composition and microstructure on its mechanical properties. The samples were hot pressed at 1550 °C under a pressure of 40 MPa for 2 h. The apparent porosity and the relative density of the sintered samples were evaluated as well as their phase composition and microstructure. The results indicated that the only phase present in the...
Source: Materials Letters - August 8, 2019 Category: Materials Science Source Type: research

EBSD study on the significance of carbon content on hardenability
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): S. Huang, B.B. Wu, Z.Q. Wang, Y.S. Yu, C.S. Wang, L. Yan, X.C. Li, C.J. Shang, R.D.K. MisraAbstractTwo high strength low alloy steels with different carbon content were studied to elucidate the effect of carbon content on hardenability in terms of crystallography. The hardness reduction from 2 to 50 mm distance from the surface in end-quenched steels of 0.09C and 0.12C was 8.0 and 3.2 HRC, respectively, which implied higher hardenability of 0.12C steel than 0.09C. At low cooling rate, the microstructure of 0.09C and 0.12C steel was granular ...
Source: Materials Letters - August 8, 2019 Category: Materials Science Source Type: research

Quantum dot decorated multi-walled carbon nanotube modified electrochemical sensor array for single drop insulin detection
Publication date: 1 November 2019Source: Materials Letters, Volume 254Author(s): Vini SinghAbstractArray based strategies on disposable screen printed electrodes (SPE) for detecting disease-specific biomarkers with high specificity and sensitivity are being explored as potential clinical diagnostic tools. Herein, we report the design of an electrochemical array with quantum dot (QD) decorated multi-walled carbon nanotube (MWNT) framework to perform the direct detection of multiple picomolar concentrations of insulin, an important biomarker for diagnosing diabetes, in physiological buffer. (Source: Materials Letters)
Source: Materials Letters - August 8, 2019 Category: Materials Science Source Type: research

Novel Ni6MnO8/NiMnO3 composite as a highly stable electrode material for supercapacitors
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Shaoming Qiao, Shixian Zhou, Naibao Huang, Junjie Zhang, Yin Sun, Liu Yang, Xiaomei DuAbstractIn our work, a Ni6MnO8/NiMnO3 composite, which are porous cuboids coated with porous spheres to form a 3D hierarchical structure, is successfully fabricated using a one-step solvothermal method. As an electrode material, this composite possesses high specific capacitance (291.9F/g at 1 A/g) and excellent rate capability (77.2% of specific capacitance maintained at 10 A/g). The specific capacitance retention is 83.4% after 5000 charge/discharge cycles...
Source: Materials Letters - August 8, 2019 Category: Materials Science Source Type: research

A significant increase in the hardness of nanotwinned titanium alloys prepared via the martensitic phase transformation
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Feng Mei Bai, Xin Ye, Hong Yan Zhang, Hong Wei Zhou, Meng Song, Ya Xin Sun, Yi Zhu HeAbstractIn this work, a nanotwinned structure of a two-phase titanium (TC21) alloy was prepared via the martensitic phase transformation method. The TC21 alloy forms initially a single phase β when the temperature reaches 1050 °C. Then, it transitions into an orthorhombic martensite (α″) material when quenched in water. After tempering at 500 °C, the martensite transforms into a high-density nanotwinned α phase material. The...
Source: Materials Letters - August 8, 2019 Category: Materials Science Source Type: research

Non-weld-thinning friction stir welding
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Meng Guan, Yuhua Wang, Yongxian Huang, Xin Liu, Xiangchen Meng, Yuming Xie, Junchen LiAbstractWeld thinning has been an inherent issue of friction stir welding, which is detrimental to the joint integrity and mechanical properties especially for thin structures. In this paper, a novel method named non-weld-thinning friction stir welding was proposed. The welding tool contained an inner shoulder and an outer shoulder, and it was adjustable to control the protrusion of inner shoulder relative to outer shoulder. The outer shoulder could accumula...
Source: Materials Letters - August 8, 2019 Category: Materials Science Source Type: research

Facile fabrication of superhydrophobic conductive polydimethylsiloxane@silver nanowires cotton fabric via dipping-thermal curing method
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Xiaofeng Liao, Hongqiang Li, Xuejun Lai, Wanjuan Chen, Xingrong ZengAbstractSuperhydrophobic materials with special functions such as electrical conductivity, magnetism and self-repairing have attracted considerable attention. Herein, a superhydrophobic conductive polydimethylsiloxane@silver nanowires (PDMS@AgNWs) cotton fabric was fabricated via a simple dipping-thermal curing method. Owing to the combination of rough structure constructed by AgNWs and the covered low-surface-energy PDMS, the as-fabricated cotton fabric exhibited superhydrop...
Source: Materials Letters - August 8, 2019 Category: Materials Science Source Type: research

Preparation of spherical WTaMoNbV refractory high entropy alloy powder by inductively-coupled thermal plasma
Publication date: 15 November 2019Source: Materials Letters, Volume 255Author(s): Jong-Min Park, Jang-Won Kang, Won-Hyuk Lee, Sung Yong Lee, Seok-Hong Min, Tae Kwon Ha, Hyung-Ki ParkAbstractSpherical WTaMoNbV refractory high entropy alloy powders were fabricated by milling and spheroidizing using inductively-coupled thermal plasma. The WTaMoNbV alloy is brittle at room temperature; therefore, the alloy ingot could be pulverized by jaw-crushing and ball-milling, and the fabricated powders had an irregular shape. After sieving using meshes ranging in size from 25 to 63 μm, the powders were spheroidized using inductively...
Source: Materials Letters - August 8, 2019 Category: Materials Science Source Type: research