Zirconia/Graphene Nanocomposites Effect on the Enhancement of Thermo-mechanical Stability of Polymer Hydrogels
In this study, the synergy effect of zirconia and graphene oxide (GO) as fillers and their contribution in the thermo-mechanical stability of the polyacrylamide (PAM) hydrogels were investigated using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) (i.e., thermal stability), and dynamic mechanical analysis (DMA) (i.e., rheological properties). The degradation temperature was lowered by 2.2% (shift from 182 °C to 178 °C) upon the addition of zirconia-graphene nanocomposites (ZrGx). The amount of bound water of the PAM-ZrG5 hydrogel, on the other hand, increased as a result of ...
Source: Materials Today Communications - October 18, 2019 Category: Materials Science Source Type: research

Dielectrical properties of Graphite Nanosheets/PVDF Composites Regulated by Coupling agent
Publication date: Available online 15 October 2019Source: Materials Today CommunicationsAuthor(s): Xue Li, Xiaoming Wang, Ling Weng, Yang Yu, Xiaorui Zhang, Lizhu Liu, Cheng WangAbstractnanosheets (GNs) with different coupling agents to enhance the dielectric properties of GNs/PVDF composite membranes, and the modified results were characterized by FT-IR. The dielectrical properties and the breakdown field strength of composites film was characterized. The results indicated that the dielectric constant of the composite increases, with the increasing of GNs volume fraction. Moreover, the coupling agent modifies the GNs to c...
Source: Materials Today Communications - October 16, 2019 Category: Materials Science Source Type: research

Thermal gelation of partially hydrolysed polyacrylamide/polyethylenimine mixtures using design of experiments approach
Publication date: December 2019Source: Materials Today Communications, Volume 21Author(s): Mohammed Abdelfetah Ghriga, Mahdi Hasanzadeh, Mourad Gareche, Seif El Islam Lebouachera, Nadjib Drouiche, Bruno GrasslAbstractPolyethylenimine crosslinked polymer gels are gaining a huge interest in conformance control applications in oilfields. They are used to reduce the production of undesirable fluids (water & gas) by blocking the fractures that connect injection and production wells. In this paper, a statistical analysis on the thermal gelation of well characterized reactants namely partially hydrolysed polyacrylamide (PHPA)...
Source: Materials Today Communications - October 16, 2019 Category: Materials Science Source Type: research

Mechanistic Insight into High Yield Electrochemical Nitrogen Reduction to Ammonia using Lithium Ions
This study opens up the possibilities of developing economically feasible electrodes for electrochemical NRR at lower energies with only transient modifications of electrodes during the electrolysis, unlike the studies reported on complex electrodes or electrolytes designed for NRR in aqueous medium to suppress the hydrogen generation.Graphical abstract (Source: Materials Today Communications)
Source: Materials Today Communications - October 16, 2019 Category: Materials Science Source Type: research

Influence of the various pore former additives on the performance and characteristics of the bare and EPVC/boehmite nanocomposite ultrafiltration membranes
Publication date: Available online 14 October 2019Source: Materials Today CommunicationsAuthor(s): Marzie Farjami, Vahid Vatanpour, Abdolreza MoghadassiAbstractThe influence of various additives of PEG (with MW = 1000, 4000 g/mol), PVP (with MW = 10000, 29000 g/mol) and Pluronic F-17 on the attributes and performance of the EPVC and EPVC/boehmite nanocomposite membranes was studied. Water contact angle, scanning electron microscopy (SEM), atomic force microscopy (AFM) and energy dispersive X-ray (EDX) analyses and also the obtained results of pure water flux, bovine serum albumin (...
Source: Materials Today Communications - October 16, 2019 Category: Materials Science Source Type: research

Corrosion inhibition of mild steel using binary mixture of sesame and castor oil in brine solution
Publication date: Available online 13 October 2019Source: Materials Today CommunicationsAuthor(s): Daniel T. Oyekunle, Tomiwa I. Oguntade, Christiana S. Ita, Temiloluwa Ojo, Oyinkepreye D. OroduAbstractBinary mixture of sesame and castor oil has been investigated as a corrosion inhibitor for mild steel in brine solutions by weight loss, polarization techniques and scanning electron microscopy (SEM) analysis. Gas Chromatography–Mass Spectroscopy (GC-MS) analysis showed the presence of unsaturated compounds like oleic, steric and palmitic acid which are responsible for the corrosion inhibitory properties of the binary ...
Source: Materials Today Communications - October 15, 2019 Category: Materials Science Source Type: research

Synthesis, characterization and qualitative assessment of self-healing capacity of PU microcapsules containing TDI and IPDI as a core agent
Publication date: Available online 14 October 2019Source: Materials Today CommunicationsAuthor(s): Vinicius Henrique de Souza Rodrigues, Alexandre Estêvão Carrara, Sabrina Sara Rossi, Leandro Mattos Silva, Rita de Cássia Lazzarini Dutra, Jorge Carlos Narciso DutraAbstractThis paper shows the results obtained during the synthesis, characterization and self-healing qualitative capacity assessment microcapsules made of polyurethane (PU) shell, a product of emulsion polymerization reaction between diphenylmethane diisocyanate (MDI) and 1,4-butanediol, and within it, as the "encapsulated" self-heal...
Source: Materials Today Communications - October 15, 2019 Category: Materials Science Source Type: research

In-situ synthesis and characterization of biocompatible magnetic ginger nanofiber composites for copper (II) removal from water
Publication date: Available online 12 October 2019Source: Materials Today CommunicationsAuthor(s): Joby Jacob, Gregary Peter, Sabu Thomas, Józef T. Haponiuk, Sreeraj GopiAbstractBionanocomposites prepared from green sources are a promising research area and cellulose nanofibers obtained from agro-waste of ginger rhizomes and their different composites with starch, chitosan (CS) and polyvinyl alcohol (PVA) have exhibited enormous mechanical as well as antimicrobial properties. This paper reports the synthesis of magnetic ginger nanofiber (M-GNF) reinforced composite films with CS, PVA and potato starch (PS) by Fe3O4 ...
Source: Materials Today Communications - October 13, 2019 Category: Materials Science Source Type: research

The effect of Styrene Maleic Anhydride on the microstructure evolution of PSF-based membrane prepared by thermal-induced phase separation method
Publication date: Available online 12 October 2019Source: Materials Today CommunicationsAuthor(s): John Michael Tesha, Derrick S. Dlamini, Zhenyu Cui, Jianxin LiAbstractPolysulfone (PSF) and Styrene Maleic Anhydride (SMA) were blended by thermally induced phase separation method in the preparation of membranes for water treatment. Dipropylene Glycol Dibenzoate (DPGDB) was used as a diluent which was extracted using ethanol. The increase in SMA concentration was positively confirmed by monitoring the intensity of the peak at 1779 cm−1 characteristic to CO in the Attenuated Total Reflectance Fourier Transform In...
Source: Materials Today Communications - October 13, 2019 Category: Materials Science Source Type: research

Structural stability, electronic, optical and lattice thermal conductivity properties of bulk and monolayer PtS_2
Publication date: Available online 12 October 2019Source: Materials Today CommunicationsAuthor(s): Hamza A H Mohammed, GM Dongho-Nguimdo, Daniel P JoubertAbstractIn the present study, we used density functional theory to study the cohesive and formation energies, mechanical and dynamical stabilities, optical properties and lattice thermal conductivity of trigonal bulk and monolayer PtS2. A careful investigation of the electronic band structure and density of states of the bulk and monolayer PtS2 shows that both are indirect band-gap semiconductors. A many-body GW0 approximation on top of density functional theory results w...
Source: Materials Today Communications - October 13, 2019 Category: Materials Science Source Type: research

Coiled artificial muscles based on uhmwpe with large muscle stroke
Publication date: Available online 11 October 2019Source: Materials Today CommunicationsAuthor(s): A.V. Maksimkin, I.I. Larin, D.I. Chukov, M.Yu. Zadorozhnyy, T. Dayyoub, V.Yu. Zadorozhnyy, F. Spieckermann, V. SoprunyukAbstractThermal sensitive сoiled artificial muscles with a large muscle stroke (87 %) based on oriented ultrahigh molecular weight polyethylene fibers were created. The storage modulus and the recovery stress were used as indicators to determine the optimal conditions for the orientation process of the UHMWPE fibers. The working mechanism of the coiled artificial muscles was discussed in terms of a one-way ...
Source: Materials Today Communications - October 12, 2019 Category: Materials Science Source Type: research

Y2O2Se as a potential matrix for optical materials: A novel preparation method and optical properties
Publication date: Available online 7 October 2019Source: Materials Today CommunicationsAuthor(s): Maria S. Tarasenko, Alexander S. Kiryakov, Alexey A. Ryadun, Natalia V. Kuratieva, Pavel E. Plyusnin, Nikolay G. NaumovAbstractA novel one-step method of preparing Y2O2Se from Y2O3 and Se in a CsCl flux is reported. Pure Y2O2Se and Y2O2Se:1%RE3+ solid solutions were quantitatively prepared and studied. The Y2O2Se sample is stable in air up to 680°C and has a melting point of 2015ºC in an inert atmosphere. Optical properties of Y2O2Se:1% RE3+ samples (RE==Ce – Nd, Sm, Eu, Tb – Yb) were investigated. It was ...
Source: Materials Today Communications - October 9, 2019 Category: Materials Science Source Type: research

Biomass derived epoxy systems: from reactivity to final properties
Publication date: Available online 7 October 2019Source: Materials Today CommunicationsAuthor(s): Guillaume Falco, Nicolas Sbirrazzuoli, Alice MijaAbstractThe present work focuses on the conception of bio-based epoxy resins arising from an increasing interest class of curing agents: the dicarboxylic acid. The hardener used was first synthesized from maleic anhydride and dipropylene glycol and then copolymerized with epoxidized linseed oil (ELO) to design resins from bio-resources. The anionic copolymerization between the two monomers has been highlighted by DSC while evolutions of chemical structures have been investigated...
Source: Materials Today Communications - October 9, 2019 Category: Materials Science Source Type: research

Thermal gelation of partially hydrolysed polyacrylamide/polyethyleneimine mixtures using design of experiments approach
Publication date: Available online 8 October 2019Source: Materials Today CommunicationsAuthor(s): Mohammed Abdelfetah Ghriga, Mahdi Hasanzadeh, Mourad Gareche, Seif El Islam Lebouachera, Nadjib Drouiche, Bruno GrasslAbstractPolyethyleneimine crosslinked polymer gels are gaining a huge interest in conformance control applications in oilfields. They are used to reduce the production of undesirable fluids (water & gas) by blocking the fractures that connect injection and production wells. In this paper, a statistical analysis on the thermal gelation of well characterized reactants namely partially hydrolysed polyacrylamid...
Source: Materials Today Communications - October 9, 2019 Category: Materials Science Source Type: research

Lattice dynamics and thermoelectric properties of YCuSe2
Publication date: December 2019Source: Materials Today Communications, Volume 21Author(s): Elkana Rugut, Daniel Joubert, Glenn JonesAbstractYttrium copper di-selenide is a cheap compound having low toxicity with potential solar cell application. Understanding the thermal transport properties of YCuSe2 is crucial for the design of an efficient solar cell since it may provide insight on device lifetime and stability. However, no experimental data on the thermal and thermoelectric properties of YCuSe2 exist. This could be attributed to the difficulty in obtaining the lattice thermal conductivity of materials due to complex na...
Source: Materials Today Communications - October 9, 2019 Category: Materials Science Source Type: research

Polarization-sensitive photoresponse of the CuSe/Se nanocomposite prepared by vacuum thermal deposition
We report on the generation of the polarization-sensitive photocurrent in the thin film of the CuSe/Se nanocomposite irradiated by femtosecond pulses of Ti:S laser. CuSe/Se bilayer consisting of nanocrystalline CuSe and amorphous Se films was obtained using successive deposition of Cu and Se on a glass substrate in the course of vacuum thermal evaporation. Synthesized bilayers were characterized using optical transmittance and Raman spectroscopy, optical, atomic force and scanning electron microscopy and X-ray diffractometry. It is demonstrated that in the longitudinal configuration, the photocurrent propagating along the ...
Source: Materials Today Communications - October 9, 2019 Category: Materials Science Source Type: research

Amorphization diversity driven by high-energy mechanical milling in β-As4S4 polymorph
Publication date: Available online 6 October 2019Source: Materials Today CommunicationsAuthor(s): Oleh Shpotyuk, Pavlo Demchenko, Yaroslav Shpotyuk, Zdenka Bujňáková, Peter Baláž, Malgorzata Hyla, Vitaliy BoykoAbstractAmorphization scenarios in multiparticulate nanocomposites based on directly synthesized β-As4S4 activated by high-energy mechanical milling are identified employing X-ray diffraction analysis complemented with ab initio quantum-chemical computational modelling. Coexistance of nanocrystalline and amorphous phases is crucial feature of these nanocomposites, their medium-range struct...
Source: Materials Today Communications - October 8, 2019 Category: Materials Science Source Type: research

Grafting of poly(methacrylic acid-co-acrylamide) film on silicon surface via a simultaneous hydrolysis process
Publication date: Available online 6 October 2019Source: Materials Today CommunicationsAuthor(s): Yang Liu, Yutong Han, Yunwen Wu, Lishuang Xiong, Tao Hang, Huiqin Ling, Anmin Hu, Liming Gao, Ming LiAbstractIn this paper, we demonstrate a one-pot method to prepare the poly(methacrylic acid-co-acrylamide) film on silicon surface by the simultaneous polymer grafting and hydrolysis of the acrylonitrile. The surface morphology, grafting density, chemical structures, grafting ratio and the hydrolysis process were studied to explore the film growth. The thickness were linearly increasing in the grafting process, which indicated ...
Source: Materials Today Communications - October 8, 2019 Category: Materials Science Source Type: research

Cerium oxide and peppermint oil loaded polyethylene oxide/graphene oxide electrospun nanofibrous mats as antibacterial wound dressings
Publication date: Available online 5 October 2019Source: Materials Today CommunicationsAuthor(s): Balakrishnan Suganya Bharathi, Thambusamy StalinAbstractWound healing is a systematic response that can heal acute and chronic wounds by effectively regenerating new connective tissues with specific microstructures and function. Here, to improve the wound healing efficiency, encapsulation of cerium oxide (CeO2) and peppermint oil (PM oil) on polyethylene oxide/graphene oxide (PEO/GO) polymeric mats was done by electrospinning technique. The physico-chemical properties of the prepared nanofibrous mats were characterized by FTIR...
Source: Materials Today Communications - October 6, 2019 Category: Materials Science Source Type: research

Molecular Simulation Study on Brushes of Poly (2-ethyl-2-oxazoline)
Publication date: Available online 5 October 2019Source: Materials Today CommunicationsAuthor(s): Payam Kelich, Ahmad AsadinezhadAbstractConformation and dynamics of poly (2-ethyl-2-oxazoline) (PEtOx) chains attached at one end to graphene nanosheet (GNS) in absence of solvent was studied using atomistic molecular dynamics (MD) simulations. The MD computations of the PEtOx brushes were carried out within canonical ensemble at 300 K for 10 ns under gradient graft density and chain length regimes. Additionally, the influence of PEtOx-GNS interactions on the brush structure was explored through system visualizat...
Source: Materials Today Communications - October 6, 2019 Category: Materials Science Source Type: research

Ab initio study of the adsorption of Potassium on B, N, and BN-doped graphene heterostructure
Publication date: Available online 5 October 2019Source: Materials Today CommunicationsAuthor(s): Kazem Zhour, Fouad El Haj Hassan, Hussein Fahs, Majid VaezzadehAbstractThe adsorption of Potassium atom on graphene doped with Nitride, Boron, and Boron nitride hexagons is studied using DFT with LDA and GGA for both spin and non-spin polarization calculations. The distortion in graphene resulting from Boron nitride doping is unnoticeable; alternatively, pure Boron and Nitrogen hexagons introduce high level of distortion in the layer. Adsorption energy, structural geometry, density of state, band structure, charge density, cha...
Source: Materials Today Communications - October 6, 2019 Category: Materials Science Source Type: research

Time-dependent Ratcheting Assessment of Steel Samples undergoing Multi-Step Loading cycles through Use of Hardening Rules
Publication date: Available online 5 October 2019Source: Materials Today CommunicationsAuthor(s): P. Karvan, A. Varvani-FarahaniAbstractThe present study evaluates ratcheting of U71Mn rail and 316 L stainless steel samples subjected to various multi-step loading cycles by means of kinematic hardening rules of Ohno-Wang (O-W), Abdel Karim-Ohno (AK-O) and Ahmadzdeh-Varvani (A-V). Chaboche’s isotropic hardening and visco-plastic description was introduced into the kinematic hardening models to further address yield surface expansion/contraction and time-dependency of steel samples. Over Low-High-High loading sequ...
Source: Materials Today Communications - October 6, 2019 Category: Materials Science Source Type: research

DSC and microstructure analysis of high temperature Ni-Ti-Hf, low hysteresis Ni-Ti-Cu and conventional super-elastic and shape memory Ni-Ti alloy ingots and wires
Publication date: Available online 5 October 2019Source: Materials Today CommunicationsAuthor(s): J.N. Lemke, A. CodaAbstractThe progression of martensitic transformations in calorimetric experiments on NiTi-based shape memory alloys (SMA) depends significantly on the material composition, processing history and the thermo-mechanical treatment which is performed to prepare the material for use in application. The phase transformations in Ni-Ti alloys are first order transitions, i.e. the microstructure symmetry changes occur spontaneously and superheating and supercooling effects emerge. Thus, the thermal scanning rate in ...
Source: Materials Today Communications - October 6, 2019 Category: Materials Science Source Type: research

Improving the photostability of curcumin using functional star-shaped polyamidoamine dendrimer: Application on PET
Publication date: December 2019Source: Materials Today Communications, Volume 21Author(s): Mohammad Dodangeh, Ren-Cheng Tang, Kamaladin GharanjigAbstractThree novel 2,4-dihydroxybenzophenone UV-absorber-containing compounds, 2,4-dihydroxybenzophenone-conjugated G0-PAMAM dendrimer-curcumin (D4), 2,4-dihydroxybenzophenone-conjugated G1-PAMAM dendrimer-curcumin (D5) and 2,4-dihydroxybenzophenone-conjugated G2-PAMAM dendrimer-curcumin (D6) were synthesized from reactant cyanuric chloride via coupling to PAMAM (G0,G1,G2) as well as curcumin. Chemical structures of newly prepared materials were proved by means of elemental analy...
Source: Materials Today Communications - October 5, 2019 Category: Materials Science Source Type: research

Corrosion performance of carbon steel in N-doped mesoporous carbon spheres (NMCS)-containing alkaline medium in presence of chloride
Publication date: Available online 2 October 2019Source: Materials Today CommunicationsAuthor(s): H. MahmoudAbstractThe electrochemical response of carbon steel in chloride-free or chloride-containing 0.1 M and 0.9 M NaOH, in the presence of 0.016 wt.% NMCS, is the subject of this work. The NMCS exhibited a negative (in 0.1 M NaOH) and positive (in 0.9 M NaOH) zeta-potential. This determined altered steel electrochemical response, improved overall, especially in chloride-containing 0.9 M NaOH. The effect was related to an enhanced Fe3+ contribution in the passive film, when NMCS we...
Source: Materials Today Communications - October 3, 2019 Category: Materials Science Source Type: research

Plasmonic gold sensitization of ZnO nanowires for solar water splitting
Publication date: Available online 30 September 2019Source: Materials Today CommunicationsAuthor(s): Shin Wook Kang, P.R. Deshmukh, Youngku Sohn, Weon Gyu ShinAbstractThis paper reports the synthesis of plasmonic gold sensitized ZnO nanowires by chemical vapor deposition and subsequent photoreduction method. The well sensitization of Au nanoparticles with mean diameter of 5.3 nm on ZnO nanowires yield a higher photocurrent density of 1.06 mAcm-2 than ZnO nanowires (0.51 mAcm-2) under illumination. Accordingly, Au nanoparticles on ZnO nanowires reveals the maximum photoelectrochemical water splitting efficiency of 0....
Source: Materials Today Communications - October 2, 2019 Category: Materials Science Source Type: research

Metastable intermetallic phases in the Al-Sm system
Publication date: Available online 30 September 2019Source: Materials Today CommunicationsAuthor(s): S.H. Zhou, F.Q. Meng, M.J. Kramer, R.T. Ott, F. Zhang, Z. Ye, S. Jain, R.E. NapolitanoAbstractThe thermodynamic landscape involving several metastable phases in the glass-forming Al-Sm system is assessed, integrating experimental measurements and first principles calculations into a comprehensive CALPHAD description. The phases examined here include Al41Sm5-η, Al60Sm11-ε, Al5Sm-θ, Al5Sm-π and Al4Sm-γ, having basis stoichiometries from 9 to 20 at% Sm, a range over which the Al-fcc and Al3Sm phases ...
Source: Materials Today Communications - October 2, 2019 Category: Materials Science Source Type: research

Improved ethanol vapor sensing properties of sputtered ZnO films by doping Ta
Publication date: Available online 30 September 2019Source: Materials Today CommunicationsAuthor(s): Xu Huang, Cuiping Li, Lirong Qian, Mingji Li, Hongji Li, Xue Chen Niu, Baohe YangAbstractPure ZnO and Ta doped ZnO films were prepared by magnetron sputtering and characterized by various techniques. The results indicated that Ta element was successfully doped in ZnO film. The grain size was decreased and the defect concentration was increased by the doping of Ta. The gas sensing test showed that the Ta dopants not only enhanced the response but also decreased the response/recovery time and improved the selectivity. The imp...
Source: Materials Today Communications - October 2, 2019 Category: Materials Science Source Type: research

Nitrogen doped carbon nanotubes decorated with iron carbide nanoparticles and their electrochemical capacitance
Publication date: Available online 27 September 2019Source: Materials Today CommunicationsAuthor(s): E. Tovar-Martinez, J.V. Cabrera-Salazar, D. Hernandez-Arriaga, M. Reyes-Reyes, Luis F. Chazaro-Ruiz, R. López-SandovalAbstractDifferent ethanol-benzylamine (EB) ratio (9/1 v/v and 1/1 v/v) reaction mixtures were prepared for the synthesis of nitrogen doped multiwalled carbon nanotubes (N-MWCNTs). The morphology of the synthesized sample depends of the used catalyst percentage, 1 wt% or 3 wt%, during the synthesis. In low ferrocene concentration, EB91-1 wt % and EB11-1 wt% samples are mainl...
Source: Materials Today Communications - September 29, 2019 Category: Materials Science Source Type: research

An adaptation of the Lewis-Nielsen equations for the thermal conductivity of short fiber reinforced hybrid composites
Publication date: Available online 27 September 2019Source: Materials Today CommunicationsAuthor(s): Nicholas C. Ecke, Johannes Höller, Jan Niedermeyer, Peter Klein, Alois K. SchlarbAbstractEstimating the thermal conductivity of fiber reinforced plastics can be challenging, as they typically have anisotropic properties due to filler orientation during processing. Several analytical models for the thermal conductivity of multiphase materials are proposed in the literature. However, these are typically aimed at particulate fillers or fibers with an idealized orientation. In this work, the orthotropic thermal conductivit...
Source: Materials Today Communications - September 29, 2019 Category: Materials Science Source Type: research

The critical effect of electrodes components mixing on efficiency of anode material for lithium-ion batteries
Publication date: Available online 27 September 2019Source: Materials Today CommunicationsAuthor(s): Fábio R. Bento, Patricia G. Corradini, Lucia H. MascaroAbstractAn investigation is attempted to highlight the importance of electrode preparation. Graphite carbon (GC), SnO2 and single wall carbon nanotubes (SWCNT) were used as components of anode catalyst for lithium-ion batteries. For mixing these materials, two common processes were performed: ball milling of GC + SnO2+ SWCNT and dispersion of SWCNT in GC-SnO2. The composite electrode prepared from dispersion step presented a superior performance, du...
Source: Materials Today Communications - September 29, 2019 Category: Materials Science Source Type: research

Molecular dynamics simulations of microstructure and transport properties of sulfonated poly-p-phenoxybenzoyl-1,4-phenylene membrane and their comparisons to sulfonated poly(ether ether ketone) membrane
Publication date: Available online 27 September 2019Source: Materials Today CommunicationsAuthor(s): Xiaohui Yang, Kun Hu, Fuxiao Zhang, Hao Chen, Yanjun LiuAbstractMolecular simulation techniques have been used to study the microstructure and dynamic properties of sulfonated poly-p-phenoxybenzoyl-1,4-phenylene (sPPBP) membrane, and the results have been compared with those for the sulfonated poly(ether ether ketone) (sPEEK) membrane. It is shown that the phase-segregated morphology of the hydrated membranes was mostly affected by the hydration level, while the temperature had a limited effect. The sPPBP membrane had more ...
Source: Materials Today Communications - September 29, 2019 Category: Materials Science Source Type: research

First-principles calculations of wurtzite ZnS1-xSex solid solutions for photocatalysis
Publication date: Available online 27 September 2019Source: Materials Today CommunicationsAuthor(s): Sajjad Hussain, Lingju Guo, Hitler Louis, Shuang Zhu, Tao HeAbstractIn this work, the structural, electronic and optical properties of ZnS1-xSex solid solutions in wurtzite phase are calculated by using full potential linearized augmented plane wave method. The GGA, HSE06 and mBJ approximations are used to calculate the bandgap values. The calculated mBJ bandgap values are close to the experimental results, which are 3.61, 3.49, 2.84, 2.72 and 2.60 eV for the compounds ZnS, ZnS0.75Se0.25, ZnS0.5Se0.5, ZnS0.25Se0.75 a...
Source: Materials Today Communications - September 29, 2019 Category: Materials Science Source Type: research

Effect of layer thickness and cross-section geometry on the tensile and compression properties of 3D printed ABS
This study examines the influence of deposition layer thickness on the mechanical properties of printed ABS material when manufacturing using Fused Filament Fabrication (FFF). Tensile and compression testing was performed to ASTM standards on samples printed with layer thickness between 0.2 mm and 0.8 mm. Results found material strength and stiffness was greatest using smaller layer thicknesses, compared with larger layer thicknesses e.g. σy(0.2mm) =31.5 MPa, UTS0.2mm= 38.2 MPa, compared with σy(0.8mm) = 23.0 MPa,  UTS0.8mm= 31.0 MPa. The recorded c...
Source: Materials Today Communications - September 29, 2019 Category: Materials Science Source Type: research

Ultrasonic assisted second phase transformations under severe plastic deformation in friction stir welding of AA2024
Publication date: Available online 27 September 2019Source: Materials Today CommunicationsAuthor(s): A.A. Eliseev, T.A. Kalashnikova, D.A. Gurianov, V.E. Rubtsov, A.N. Ivanov, E.A. KolubaevAbstractThe study explores the effect of ultrasonic vibrations on the dissolution and precipitation of secondary phases in aluminum alloy 2024 under the action of severe plastic deformation in friction stir welding. A method for strain estimation in friction stir welding is proposed to assess the contribution of deformation to microstructural changes. The acoustoplastic effect is estimated which causes an increase in the degree of deform...
Source: Materials Today Communications - September 29, 2019 Category: Materials Science Source Type: research

Colorful nanofibrous composite membranes by two-nozzle electrospinning
Publication date: Available online 28 September 2019Source: Materials Today CommunicationsAuthor(s): Xiangxiang Liu, Xuan Wang, Hongyang Ma, Shyam Venkateswaran, Benjamin S. HsiaoAbstractColorful electrospun nanofibrous composite membranes were fabricated by a two-nozzle electrospinning apparatus. While loading two polyacrylonitrile (PAN) solutions with different primary colors (e.g., yellow and blue), the nanofibrous composite membrane of a secondary color (e.g., green) could also be created. Both fiber diameter and pore size of the membrane measured from SEM images were decreased by the incorporation of dye molecules com...
Source: Materials Today Communications - September 29, 2019 Category: Materials Science Source Type: research

Solid-State Synthesized Hyperbranched Polyamides as Hosts for Antimicrobial Silver Nanoparticles
Publication date: Available online 26 September 2019Source: Materials Today CommunicationsAuthor(s): Vivian A. Tomaz, Heveline D.M. Follmann, Vanessa H. Fragal, Elizângela H. Fragal, Maria A. Witt, Francielle P. Garcia, Celso V. Nakamura, Rafael Silva, Adley F. RubiraAbstractSilver nanoparticles (AgNPs) are versatile materials that offer interesting perspectives in biomedical, catalytic, and electronic fields, which certainly prompted research for sustainable synthetic routes with low cost since it meets both industrial requirements and minimize environmental damage. In fact, some hyperbranched polymers (HBPs) can be...
Source: Materials Today Communications - September 28, 2019 Category: Materials Science Source Type: research

Numerical and analytical solutions for determination of interdiffusion coefficients in superalloys during homogenization
Publication date: Available online 26 September 2019Source: Materials Today CommunicationsAuthor(s): Mohammad Javad Sohrabi, Hamed MirzadehAbstractThe solution of the Fick's second law of diffusion in conjunction with the concept of residual segregation index was used for studying the interdiffusion of Ti in the matrix of as-cast Ni-based superalloys during homogenization at elevated temperatures. It was found that the consideration of two-dimensional diffusion model necessitates the numerical solution with the resulting non-unique and inconsistent diffusion parameters. Conversely, the one-dimensional diffusion model with ...
Source: Materials Today Communications - September 28, 2019 Category: Materials Science Source Type: research

Density-functional tight-binding approach for the structural analysis and electronic structure of copper hydride metallic nanoparticles
Publication date: Available online 26 September 2019Source: Materials Today CommunicationsAuthor(s): Hasan Kurban, Mustafa Kurban, Mehmet DalkılıçAbstractWe perform a theoretical investigation using the density functional tight binding (DFTB) approach for the structural analysis and electronic structure of copper hydride (CuH) metallic nanoparticles (NPs) of different size (from 0.7 to 1.6 nm). By increasing the size of CuH NPs, the number of bonds, segregation phenomena and radial distribution function (RDF) of binary Cu-Cu, Cu-H and H-H interactions are analyzed using new implementations in R code. The re...
Source: Materials Today Communications - September 28, 2019 Category: Materials Science Source Type: research

Leachability of the metakaolinite-rich materials in different alkaline solutions
Publication date: Available online 27 September 2019Source: Materials Today CommunicationsAuthor(s): Jan Kohout, Petr Koutník, Petr Bezucha, Zdeňka KwoczynskiAbstractThe leaching behaviour of three metakaolinite-rich materials prepared from granulated kaolin and two kaolinitic claystones in alkaline solutions at room temperature was investigated with the aid of centrifugal separation of clear supernatant from the reaction mixture. Two types of alkaline solutions (sodium or potassium hydroxide and sodium or potassium silicate solution) and two solid/ liquid weight ratios (0.04 and 0.65) were applied in a large time ...
Source: Materials Today Communications - September 28, 2019 Category: Materials Science Source Type: research

Cluster Compounds Formation in Metal Alloys Crystals
Publication date: Available online 25 September 2019Source: Materials Today CommunicationsAuthor(s): V.G. TkachenkoAbstractThe formation and physical origin of the pre-cluster complexes and pre-phase (cluster) compounds have been studied on cast magnesium alloys (in the liquid and solid states) as well as other primary solutions enriched with excess (non-intrinsic, structural) vacancies. The results produced by DSC, TEM observation, Auger-electron, UV-and X-ray photoelectron spectroscopy techniques were combined with positron annihilation, electroresistance, and internal friction measurements to evaluate different stages o...
Source: Materials Today Communications - September 26, 2019 Category: Materials Science Source Type: research

Facile fabrication of an elastics maleic anhydride-grafted polypropylene monolith for oil/water separation
In this study, we report the fabrication of a highly elastic and macroporous monolith from a maleic anhydride (MAH)-grafted polypropylene (PP-g-MAH), which is a low-cost raw material. Simple cooling a PP-g-MAH solution in a mixed solvent of decalin and N-methyl-2-pyrrolidone forms a porous physical gel. A monolith was obtained upon exchanging the embedded solvent molecules with acetone. The monolith shows a fibrous network structure with tunable average pore sizes from sub-1 to 10 µm. In addition, the monolith exhibits a good elasticity with the ability to sustain a stress of 600 kilopascal at a strain of 30% ...
Source: Materials Today Communications - September 26, 2019 Category: Materials Science Source Type: research

Hard-soft Thiol-ene Materials without Interfacial Weakness
Publication date: Available online 23 September 2019Source: Materials Today CommunicationsAuthor(s): Peng Shen, Saeed Zajforoushan Moghaddam, Qian Huang, Anders Egede Daugaard, Suojiang Zhang, Peter SzaboAbstractThiol-ene materials are a series of materials that can be crosslinked using a suitable photo-initiator and a UV light source. An advantage of thiol-ene materials is that they can be tailored to have specific mechanical properties by controlling the stoichiometry of the mixtures. By combination of different reactants, it is therefore, in principle, possible to prepare monoliths with greatly varying mechanical proper...
Source: Materials Today Communications - September 25, 2019 Category: Materials Science Source Type: research

Simultaneous uniaxial creep testing of time-dependent membrane materials with optical devices
Publication date: Available online 21 September 2019Source: Materials Today CommunicationsAuthor(s): Bing Zhao, Jianhui Hu, Wujun Chen, Jianwen Chen, Zhongliang JingAbstractMembrane materials have been widely used in the fields of building structures, super-pressure balloons, stratosphere airships and space deployable antennas. Among the material properties, long-term creep of membranes is a very essential factor in influencing the structural safety. This paper thus presents the simultaneous uniaxial creep testing of a typical time-dependent membrane material with optical devices. To achieve this goal, a low-cost testing m...
Source: Materials Today Communications - September 22, 2019 Category: Materials Science Source Type: research

Urbach energy of Cu(In,Ga)Se2 and Cu(In,Ga)(S,Se)2 absorbers prepared by various methods: Indicator of their quality
Publication date: Available online 21 September 2019Source: Materials Today CommunicationsAuthor(s): Jakapan Chantana, Yu Kawano, Takahito Nishimura, Takashi MinemotoAbstractCorrelation between Urbach energy (EU) and open-circuit voltage deficit (VOC,def) of Cu(In,Ga)Se2 (CIGSe) and Cu(In,Ga)(S,Se)2 (CIGSSe) solar cells is examined, where the CIGSe and CIGSSe absorbers are deposited by different methods. The EU is directly defined from an exponential tail in a long-wavelength edge of an external quantum efficiency. It is shown that the EU is decreased with increased carrier lifetimes corelating to the VOC,def of the solar ...
Source: Materials Today Communications - September 22, 2019 Category: Materials Science Source Type: research

Adsorptive removal of alcohols from aqueous solutions by N-tertiary-butylacrylamide (NtBA) and acrylic acid co-polymer gel
Publication date: Available online 20 September 2019Source: Materials Today CommunicationsAuthor(s): Samayita Chakraborty, Rabin Bera, Arup Mandal, Ayan Dey, Debabrata Chakrabarty, Eldon R. Rene, Piet N.L. LensAbstractA co-polymer gel of N-tert-butylacrylamide and acrylic acid was swelled in alcohols differing in its dipole moment and H-bonding interaction parameter so as to inspect the relative affinities of the gel towards alcohols. The gel swelled 900% in ethanol, 1200 % in propanol and 750% in butanol. The extent of swelling can be used as a guide for preferential removal of particular alcohol from its mixture. Studies...
Source: Materials Today Communications - September 22, 2019 Category: Materials Science Source Type: research

Development of Novel 3D Scaffolds Using BioExtruder by the Incorporation of Silica into Polycaprolactone Matrix for Bone Tissue Engineering
Publication date: Available online 18 September 2019Source: Materials Today CommunicationsAuthor(s): Nandini A. Pattanashetti, Sara Biscaia, Carla Moura, Geoffrey R. Mitchell, Mahadevappa Y. KariduraganavarAbstractDevelopment of three-dimensional (3D) scaffolds has acquired a great importance for bone repair and tissue reconstruction. Thus, this paper addresses the development of 3D scaffolds by varying the content of silicon dioxide (SiO2) in polycaprolactone (PCL) matrix. The scaffolds were fabricated by employing a novel fused deposition modelling technique (BioExtruder). The physicochemical properties of the developed ...
Source: Materials Today Communications - September 20, 2019 Category: Materials Science Source Type: research

Fabrication of High Dielectric Permittivity Polymer Composites by Architecting Aligned Micro-Enhanced-Zones of Ultralow Content Graphene Using Electric Fields
Publication date: Available online 17 September 2019Source: Materials Today CommunicationsAuthor(s): Yuwei Chen, Yuhong Liu, Jiying Yang, Bailang Zhang, Zhendong Hu, Quan Wang, Weifei Wu, Yuanyuan Shang, Yumin Xia, Yongxin Duan, Kun Fu, Jianming ZhangAbstractHigh dielectric permittivity flexible composites have long been desired for enhancing the performance of embedded capacitors. One of the most promising approaches to improve the dielectric permittivity of flexible polymer is the addition of fillers with specific nanostructures. Previous reports revealed that nanocomposites with aligned 10 wt% barium titanate particles ...
Source: Materials Today Communications - September 18, 2019 Category: Materials Science Source Type: research

Nanoscale Domain Structure Evolution and Magnetoelectric Coupling for PMN-33PT/Terfenol-D Multiferroic Composite
Publication date: Available online 17 September 2019Source: Materials Today CommunicationsAuthor(s): K.Y. Fang, L.H. Gong, W.Q. Jing, F. FangAbstractMultiferroic composites of Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) single crystal and Tb0.3Dy0.7Fe2 (Terfenol-D) possess strong magnetoelectric (ME) coupling at room temperature and hold promises as magnetic field sensors, and energy harvesting devices, etc. The nanoscale domain structure evolution upon the applied magnetic field determines the ME coupling. Via introducing of the PLM (Polarized Light Microscope) into the commercialized Piezoelectric Force Microscope (PFM) (named as...
Source: Materials Today Communications - September 18, 2019 Category: Materials Science Source Type: research

The mechanistic actions of different silver species at the surfaces of polyacrylonitrile nanofibers regarding antibacterial activities
Publication date: Available online 16 September 2019Source: Materials Today CommunicationsAuthor(s): Duy-Nam Phan, Nasanjargal Dorjjugder, Yusuke Saito, Goro Taguchi, Hoik Lee, Jung Soon Lee, Ick-Soo KimAbstractThe mechanism of action and toxicity of silver species have been suggested by numerous direct observations. However, as far as we are concerned, comprehensive research to compare modes of action between different silver species at identical silver contents has not yet been reported. The activities of silver species at the interfaces of nanofiber scaffolds and bacterial medium under the impediment of chloride salt, p...
Source: Materials Today Communications - September 17, 2019 Category: Materials Science Source Type: research