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Items from 1 to 20 out of 10,064 results

article

Synthesis, spectroscopic, thermal and antimicrobial studies of neodymium(III) and samarium(III) complexes derived from tetradentate ligands containing N and S donor atoms

Qurratul Ain, S.K. Pandey, O.P. Pandey, S.K. Sengupta, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2015 > 140 > Complete > 27-34

Trivalent lanthanide complexes of the type [Ln(L)Cl(H ₂ O) ₂ ] (where Ln=Nd(III) or Sm(III) and LH ₂ =Schiff bases derived by the condensation of 3-(phenyl/substitutedphenyl)-4-amino-5-mercapto-1,2,4-triazole with diacetyl/benzil) have been synthesized by the reactions of anhydrous lanthanide(III) chloride with Schiff bases in methanol. The structures of the complexes have...

article

Growth, spectral, thermal, optical, mechanical and etching studies of l-lysine semi-maleate (l-LSM) single crystals

V. Vasudevan, N. Renuka, R. Ramesh Babu, K. Ramamurthi, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2015 > 136 > Part C > 1850-1856

Organic nonlinear optical material, l-lysine semi-maleate (l-LSM) single crystals were grown by slow cooling solution growth technique. The crystal system of grown l-LSM was confirmed by single crystal and powder X-ray diffraction analyzes. Functional groups of the grown crystal have been identified by Fourier Transform Infrared spectral analysis. The proton and carbon NMR spectral studies confirm...

article

Chitosan and chitosan composites reinforced with carbon nanostructures

C.N. Brysch, E. Wold, M. Patterson, R. Ordoñez Olivares, more

Journal of Alloys and Compounds > 2014 > 615 > Supplement 1 > S515-S521

Chitosan is a naturally-occurring polymer that can be derived from chitin through a deacetylation process from shells of crustaceans. Chitosan is abundant, easily collected as waste and repurposed for industrial and biomedical applications. This work demonstrates that the mechanical properties of chitosan can be improved by thermomechanical processing (milling and sintering) and through reinforcement...

article

Polyaniline–Zn0.2Mn0.8 Fe2O4 ferrite core–shell composite: Preparation, characterization and properties

M. Khairy, M. Khairy

Journal of Alloys and Compounds > 2014 > 608 > Complete > 283-291

Zn _0.2 Mn _0.8 Fe ₂ O ₄ ferrite nanoparticles coated with polyaniline, forming a composite structure, were synthesized by in situ chemical oxidation polymerization at different ferrite weight ratio (PANI/ZnMn ferrite=30% and 50%). The ZnMn ferrite nanoparticles were prepared by the sol–gel combustion method using metal nitrates as precursors. The structure, morphology,...

article

Determination of Rigidity point/temperature using thermal analysis method and mechanical technique

Mile B. Djurdjevic, Gerhard Huber, M.B. Djurdjevic, G. Huber

Journal of Alloys and Compounds > 2014 > 590 > Complete > 500-506

The aim of this paper is to introduce a new method for determining Rigidity temperature applying cooling curve analysis. The determined values of Rigidity temperatures for three AlSi8Cu3 alloys with different contents of Strontium using thermal analysis technique have been compared with Rigidity temperatures obtained using mechanical technique (viscosity measurement). It was established that there...

article

Elastic incoherent neutron scatterings wavevector and thermal analysis on glass-forming homologous disaccharides

F. Migliardo, M.T. Caccamo, S. Magazù, F. Migliardo, more

Journal of Non-Crystalline Solids > 2013 > 378 > Complete > 144-151

A wavelet analysis of Elastic Incoherent Neutron Scattering (EINS) intensity data collected, as a function of wavevector, on three glass forming systems, i.e. on the homologous disaccharides trehalose, maltose and sucrose, is presented. The wavelet transform allows to explore the wavevector behavior of the scattered intensity at different scales highlighting the correlation between the signal and...

article

Understanding interpenetrating-polymer-network-like porous nitrile butadiene rubber hybrids by their long-period miscibility

Jihua Zhang, Lifeng Wang, Yunfeng Zhao, J. Zhang, more

Materials and Design > 2013 > 51 > Complete > 648-657

In this article, tetrakis [methylene-3-(3, 5-di-tert-butyl-4-hydroxy phenyl) propionyloxy] methane (AO-60) with hydrogen bonds was designed to interpenetrate into the chemical crosslinking bonds of nitrile butadiene rubber (NBR) and then porous materials were prepared. Scanning electron microscopy (SEM), atomic force microscopy (AFM) images and dynamic mechanical analyses (DMA) demonstrate that NBR...

article

Crystal growth kinetics in Se87.5 Te10 Sn2.5 glass

M.A. Abdel-Rahim, A. Gaber, A.A. Abu-Sehly, N.M. Abdelazim, more

Journal of Non-Crystalline Solids > 2013 > 376 > Complete > 158-164

The crystallization process of Se _87.5 Te ₁₀ Sn _2.5 glassy was studied by differential thermal analysis (DTA) technique under non-isothermal condition at various heating rates. The crystallization parameters were calculated using different models. The validity of the Johnson–Mehl–Avrami (JMA) model to describe the crystallization process for the studied composition was discussed...

article

Oxygen potentials of (U0.685Pu0.270Am0.045)O2−x solid solution

Masahiko Osaka, Isamu Sato, Takashi Namekawa, Ken Kurosaki, more

Journal of Alloys and Compounds > 2005 > 397 > 1-2 > 110-114

Oxygen potentials of (U,Pu)O _2−x (MOX) containing 4.5% of AmO ₂ , (U _0.685 Pu _0.270 Am _0.045 )O _2−x , were measured as a function of oxygen to metal (O/M) ratio at 1123, 1273 and 1423K by thermogravimetric analysis (TGA) and discussed from the viewpoint of defect structure of oxygen deficient non-stoichiometric fcc phase. The (U _0.685 Pu ...

article

Phase transformation on heating of an aged cement paste

E.T. Stepkowska, J.M. Blanes, F. Franco, C. Real, more

Thermochimica Acta > 2004 > 420 > 1-2 > 79-87

The standard cement paste (C-43-St) was studied previously by static heating, SH, immediately after 1 month hydration at w/c = 0.4 [J. Therm. Anal. Calorim. 69 (2002) 187]. This paste after 5-year ageing (unprotected from contact with air) was subject to thermal analysis in air and in argon (DTA, DTG and TG), to XRD at various temperatures, T, in a high temperature chamber, to mass spectroscopy (MS)...

article

High‐Precision Dilatometry for the Study of Precipitation Processes and Microalloying Effects in Lightweight Alloys ‐ A Specific Review

Wolfgang Sprengel, Roland Würschum

Advanced Engineering Materials > 26 > 19 > n/a - n/a

By dilatometry, the absolute change in the length of a sample is measured. As length, i.e., volume, is a state variable, its change can be monitored for long time ranges. This is the decisive advantage compared to the widely applied calorimetric methods which are based on a rate (change of heat) and where the maximum time range is determined by the resolution limit of the heat flow measurement. In...

article

Targeting Manganese Amidinate and ß‐Ketoiminate Complexes as Precursors for Mn‐Based Thin Film Deposition

Martin Wilken, Arbresha Muriqi, Annika Krusenbaum, Michael Nolan, more

Chemistry – A European Journal > 30 > 45 > n/a - n/a

With a focus on Mn based organometallic compounds with suitable physico‐chemical properties to serve as precursors for chemical vapor deposition (CVD) and atomic layer deposition (ALD) of Mn‐containing materials, systematic synthetic approaches with ligand variation, detailed characterization, and theoretical input from density functional theory (DFT) studies are presented. A series of new homoleptic...

article

Mechanical performance of denture acrylic resin modified with poly(4‐styrenesulfonic acid‐co‐maleic anhydride) sodium salt and strontium titanate

Houda Taher Elhmali, Ivana Stajcic, Milos Petrovic, Bojan Jankovic, more

Polymer Composites > 45 > 12 > 11404 - 11415

Since acrylate‐based materials are widely used in dentistry, their drawbacks such as low impact resistance and hardness, require continuous research in the field of materials science in order to avoid sudden fracture caused by chewing or fall. In this study, auto‐polymerizing poly(methyl methacrylate) (PMMA), commonly used as denture base material, was reinforced with poly(4‐styrenesulfonic acid‐...

article

Nano clay treated jute fiber reinforced epoxy composites: Thermo‐kinetic, morphological and mechanical analysis

Brijesh Kumar Yadav, Vandna, Devendra Kumar Gond, Vijay Laxmi Yadav

Polymer Composites > 45 > 11 > 10069 - 10083

Current scientific research prioritizes sustainable and cost‐effective materials due to the depletion of traditional non‐renewable sources. Natural fiber reinforced composite materials emerge as promising solutions. However natural fibers being hydrophilic in nature are less compatible with hydrophobic epoxy matrix, to address this issue nano clay treatment of jute fibers have been done and epoxy...

article

Static and dynamic mechanical characterization and thermal analysis for multi‐ply structure of woven nettle (Girardinia diversifolia) reinforced poly(lactic acid) biocomposites

Parna Nandi, Dipayan Das

Polymer Composites > 45 > 10 > 9440 - 9460

Poly(lactic acid) fiberwebs and multi‐ply assemblies of nettle woven reinforcement are used to develop a series of nettle/PLA biocomposites with different reinforcement orientations. The tensile strength, flexural strength, impact strength, and thermal properties of the biocomposites are found to improve by piling nettle fabrics and are also found to depend strongly on the piling architecture and...

article

Thermomechanical evaluation of zinc oxide/hydroxyapatite/high‐density polyethylene hybrid composites

H. M. Babar Munir, Saima Yasin, Tanveer Iqbal, Sabih Qamar, more

Journal of Applied Polymer Science > 141 > 29 > n/a - n/a

This study examines the impact of zinc oxide (ZnO) on the spectral, thermal, mechanical, and morphological characteristics of developed composites of high‐density polyethylene (HDPE). Composite samples were fabricated with different compositions of ZnO (0, 5, 10, 15, and 20 wt%) along with a constant quantity of hydroxyapatite (HA, 10 wt%) in pure HDPE. The synthesized hybrid polymer composites were...

article

DL‐malic acid for inhibiting the re‐ignition of long‐flame coal and its micro‐reaction mechanism

Yun‐chuan Bu, Hui‐yong Niu, Hai‐yan Wang, Tian Qiu, more

Asia‐Pacific Journal of Chemical Engineering > 19 > 3 > n/a - n/a

To study the metal ion chelating agent (DL‐malic acid) inhibiting oxidation characteristics of residual coal in goaf, the microscopic thermal transformation characteristics of the treated coal samples were obtained using apparent morphology, infrared spectroscopy, free radical testing, and thermal analysis. The results demonstrate that after the addition of malic acid, the sphericity and roundness...

article

Phase equilibrium investigations and thermodynamic modeling of the HfO₂–Ta₂O₅ system

Manuel Löffler, Olga Fabrichnaya

International Journal of Applied Ceramic Technology > 21 > 4 > 2583 - 2595

The HfO₂–Ta₂O₅ system was investigated using two distinct methods: the equilibration method at temperatures ranging from 1 573 to 1 873 K and the differential thermal analysis method up to 2 473 K. To identify the phases, X‐ray diffraction (XRD) and scanning electron microscopy with energy‐dispersive X‐ray spectroscopy (SEM/EDX) were employed. The temperature of the eutectic reaction L→Hf₆Ta₂O₁₇+Ta...

article

Coal-plastic waste blendings. Experimental research and prediction of the thermal process

Agnieszka Kijo-Kleczkowska, Adam Gnatowski, Marcin Gajek, Jarosław Krzywanski, more

Archives of Thermodynamics > 2024 > Vol. 45, no 2 > 117--128

The topic of waste incineration/co-incineration is critical, given the increasingly stringent regulations on environmental aspects. The widespread use of polymeric materials generates significant waste, posing an ecological problem. Current regulations mandate a reduction in the landfilling of plastic waste, which should be replaced by recycling, with the possibility of exploiting the energy potential...

article

Crystal Structure, Hirshfeld Surface, Optical, Thermal, NLO, and DFT Analyses of 5‐Methyl‐1H‐Imidazole‐3‐Ium‐4‐ Carboxybutanoate crystal

K. Karthika, C. Senthilkumar, K. S. Dhivya, M. Srinivasan, more

Crystal Research and Technology > 59 > 5 > n/a - n/a

An organic 5‐methyl‐1H‐imidazole‐3‐ium‐4‐carboxybutanoate (5MIC) co‐crystal is grown by slow evaporation solution growth technique (SEST) at room temperature. The 5MIC is synthesized using 4‐methylimidazole and glutaric acid in a 1:1 ratio using methanol as a solvent. The 5MIC crystal lattice parameters are identified using single‐crystal X‐ray diffraction analysis. The experimental X‐ray diffraction...

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Search results

Synthesis, spectroscopic, thermal and antimicrobial studies of neodymium(III) and samarium(III) complexes derived from tetradentate ligands containing N and S donor atoms

Growth, spectral, thermal, optical, mechanical and etching studies of l-lysine semi-maleate (l-LSM) single crystals

Chitosan and chitosan composites reinforced with carbon nanostructures

Polyaniline–Zn0.2Mn0.8 Fe2O4 ferrite core–shell composite: Preparation, characterization and properties

Determination of Rigidity point/temperature using thermal analysis method and mechanical technique

Elastic incoherent neutron scatterings wavevector and thermal analysis on glass-forming homologous disaccharides

Understanding interpenetrating-polymer-network-like porous nitrile butadiene rubber hybrids by their long-period miscibility

Crystal growth kinetics in Se87.5 Te10 Sn2.5 glass

Oxygen potentials of (U0.685Pu0.270Am0.045)O2−x solid solution

Phase transformation on heating of an aged cement paste

High‐Precision Dilatometry for the Study of Precipitation Processes and Microalloying Effects in Lightweight Alloys ‐ A Specific Review

Targeting Manganese Amidinate and ß‐Ketoiminate Complexes as Precursors for Mn‐Based Thin Film Deposition

Mechanical performance of denture acrylic resin modified with poly(4‐styrenesulfonic acid‐co‐maleic anhydride) sodium salt and strontium titanate

Nano clay treated jute fiber reinforced epoxy composites: Thermo‐kinetic, morphological and mechanical analysis

Static and dynamic mechanical characterization and thermal analysis for multi‐ply structure of woven nettle (Girardinia diversifolia) reinforced poly(lactic acid) biocomposites

Thermomechanical evaluation of zinc oxide/hydroxyapatite/high‐density polyethylene hybrid composites

DL‐malic acid for inhibiting the re‐ignition of long‐flame coal and its micro‐reaction mechanism

Phase equilibrium investigations and thermodynamic modeling of the HfO₂–Ta₂O₅ system

Coal-plastic waste blendings. Experimental research and prediction of the thermal process

Crystal Structure, Hirshfeld Surface, Optical, Thermal, NLO, and DFT Analyses of 5‐Methyl‐1H‐Imidazole‐3‐Ium‐4‐ Carboxybutanoate crystal

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