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You searched for: Journal name Journal of materials science Remove constraint Journal name: Journal of materials science Publication year rev 7986-2014 Remove constraint Publication year rev: 7986-2014 Source 2014 v.49 no.17 Remove constraint Source: 2014 v.49 no.17
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1. Effect of interface modification on PMMA/graphene nanocomposites

Author:
Qingshi Meng; Hsu-Chiang Kuan; Sherif Araby; Nobuyuki Kawashima; Nasser Saber; Chun H. Wang; Jun Ma
Source:
Journal of materials science 2014 v.49 no.17 pp. 5838-5849
ISSN:
0022-2461
Subject:
absorption; polymethylmethacrylate; nanocomposites; surfactants; transmission electron microscopy; graphene; ethanol
Abstract:
... Graphene platelets (GnPs) were surface modified with a long-chain surfactant B200, and then compounded with polymethyl methacrylate (PMMA). B200 provided an anchor into GnPs and a bridge into the matrix, thus creating molecular entanglement between matrix and GnPs. The interface modification promoted the dispersion of GnPs, as no aggregates of GnPs were observed on the fracture surface of the modi ...
DOI:
10.1007/s10853-014-8278-0

2. Fe doping in ZnS for realizing nanocrystalline-diluted magnetic semiconductor phase

Author:
Prayas Chandra Patel; P. C. Srivastava
Source:
Journal of materials science 2014 v.49 no.17 pp. 6012-6019
ISSN:
0022-2461
Subject:
EDTA (chelating agent); Fourier transform infrared spectroscopy; X-ray diffraction; coprecipitation; crystallites; ions; iron; magnetic properties; semiconductors; transmission electron microscopy; zinc
Abstract:
... Zn₁₋ₓ Fe ₓ S (x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.12, and 0.15) samples have been synthesized by the chemical co-precipitation method, using ZnCl₂and Na₂S as starting materials, FeCl₃as a dopant and Ethylenediaminetetraacetic acid (EDTA) as capping agent. Investigations of the structural, optical, and magnetic properties of the prepared samples have been carried out. The results of X-ray diffracti ...
DOI:
10.1007/s10853-014-8321-1

3. Impurity effects on the nucleation and growth of primary Al3(Sc,Zr) phase in Al alloys

Author:
J. H. Li; B. Oberdorfer; S. Wurster; P. Schumacher
Source:
Journal of materials science 2014 v.49 no.17 pp. 5961-5977
ISSN:
0022-2461
Subject:
alloys; aluminum; copper; iron; magnesium; particle size distribution; scandium; silicon; solidification; titanium; zirconium
Abstract:
... Impurity effects on the nucleation and growth of primary Al₃(Sc,Zr) phase have been investigated in high purity Al alloys and commercial purity Al alloys, respectively. In the case of high purity Al alloys, primary Al₃(Sc,Zr) phases were found to be pushed to grain boundaries ahead of the solidification front. Such type of primary Al₃(Sc,Zr) phase did not contribute to the heterogeneous nucleation ...
DOI:
10.1007/s10853-014-8315-z

4. Plasma exposure inducing crystallization of indium oxide film with improved electrical and mechanical properties at room temperature

Author:
Lei Yang; Jiaqi Zhu; Jie Bai; Yuankun Zhu; Bing Dai; Hailing Yu; Zhenyu Jia; Jiecai Han
Source:
Journal of materials science 2014 v.49 no.17 pp. 5955-5960
ISSN:
0022-2461
Subject:
crystallization; electric power; indium; mechanical properties; temperature; transmittance
Abstract:
... A novel plasma exposure technique has been introduced into conventional magnetron sputtering process to enhance the crystallization of indium oxide (In₂O₃) films at room temperature. The effect of plasma exposure technique with different pulsed DC voltages on the electrical and mechanical properties of In₂O₃films was investigated. It is observed that film crystallization can be significantly enhan ...
DOI:
10.1007/s10853-014-8314-0

5. Strain engineering of piezoelectric properties of strontium titanate thin films

Author:
F. Sun; H. Khassaf; S. P. Alpay
Source:
Journal of materials science 2014 v.49 no.17 pp. 5978-5985
ISSN:
0022-2461
Subject:
acoustics; engineering; lead; models; phase transition; strontium; temperature; thermodynamics
Abstract:
... The in-plane and out-of-plane piezoelectric properties of (001) strontium titanate (SrTiO₃, STO) epitaxial thin films on pseudo-cubic (001) substrates are computed as a function of in-plane misfit strain. A nonlinear thermodynamic model is employed, which takes into account the appropriate mechanical boundary conditions, the electromechanical coupling between the polarization and the in-plane latt ...
DOI:
10.1007/s10853-014-8316-y

6. Structure, swelling, and drug release of thermoresponsive poly(amidoamine) dendrimer–poly(N-isopropylacrylamide) hydrogels

Author:
Sara Bekhradnia; Kaizheng Zhu; Kenneth D. Knudsen; Sverre Arne Sande; Bo Nyström
Source:
Journal of materials science 2014 v.49 no.17 pp. 6102-6110
ISSN:
0022-2461
Subject:
X-radiation; crosslinking; drug delivery systems; drugs; gels; hydrocolloids; hydrogen bonding; hydrophilicity
Abstract:
... Functional drug delivery systems are important for improved pharmacotherapy. The aim of this work was to describe how the introduction of varying amounts of the dendrimer polyamidoamine (PAMAM) into a chemically cross-linked thermoresponsive poly(N-isopropylacrylamide) (PNIPAAM) gel affects the structure, swelling properties, and drug release characteristics. The structure of the gel system was ch ...
DOI:
10.1007/s10853-014-8340-y

7. Study on Mn-induced Jahn–Teller distortion in BiFeO3 thin films

Author:
Surbhi Gupta; Monika Tomar; Vinay Gupta
Source:
Journal of materials science 2014 v.49 no.17 pp. 5997-6006
ISSN:
0022-2461
Subject:
Fourier transform infrared spectroscopy; Raman spectroscopy; X-ray diffraction; energy; manganese; ozone
Abstract:
... Present work reports Raman spectroscopy study of single-phase Mn-doped BiFeO₃[BiFe₁₋ₓ Mn ₓ O₃(0 ≤ x ≤ 0.20)] polycrystalline thin films carried out in backscattering geometry. De-convolution of Raman spectra showed a gradual transition in the crystal symmetry from rhombohedral (−R) to multiphase [rhombohedral (−R) + tetragonal (−T)] structure with increasing Mn doping concentration in BiFe₁₋ₓ Mn ₓ ...
DOI:
10.1007/s10853-014-8318-9

8. Thermal conductivities of alumina-based multiwall carbon nanotube ceramic composites

Author:
Kaleem Ahmad; Pan Wei; Chunlei Wan
Source:
Journal of materials science 2014 v.49 no.17 pp. 6048-6055
ISSN:
0022-2461
Subject:
aluminum oxide; carbon nanotubes; ceramics; heat tolerance; modulus of elasticity; porosity; temperature; thermal conductivity
Abstract:
... Composites incorporating various vol.% (0.0, 1.1, 6.4, and 10.4) of multiwall carbon nanotubes (MWCNTs) in alumina were consolidated by the spark plasma sintering. Their thermal transport properties were investigated over the temperature range 300–800 K as a function of nanotube contents. It was observed that the temperature-dependent effective thermal conductivity decreases with the addition of M ...
DOI:
10.1007/s10853-014-8327-8

9. Yb3+ concentration dependence of upconversion luminescence in Y2Sn 2O 7:Yb 3+/Er 3+ nanophosphors

Author:
Jinsheng Liao; Liling Nie; Shaohua Liu; Bao Liu; He-rui Wen
Source:
Journal of materials science 2014 v.49 no.17 pp. 6081-6086
ISSN:
0022-2461
Subject:
energy; erbium; heat treatment; light intensity; nanomaterials; phosphorescence; temperature; tin; ytterbium; yttrium
Abstract:
... Pyrochlore Y₂Sn₂O₇nanophosphors codoped with Er³⁺(fixed 2 at.%) and Yb³⁺ions (2–16 at.%) were synthesized via hydrothermal process followed by heat treatment. We investigate the infrared-to-visible upconversion (UC) luminescence properties of Er–Yb codoped Y₂Sn₂O₇. Upon 980 nm excitation at room temperature, green (at ~522 and 544 nm) and red (at ~661 nm) UC emissions were observed, which are ascr ...
DOI:
10.1007/s10853-014-8334-9

10. A facile room temperature synthesis of ZnO nanoflower thin films grown at a solid–liquid interface

Author:
Aarti H. Jadhav; Sagar H. Patil; Shivaram D. Sathaye; Kashinath R. Patil
Source:
Journal of materials science 2014 v.49 no.17 pp. 5945-5954
ISSN:
0022-2461
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; additives; energy-dispersive X-ray analysis; ethanol; flowering; nanomaterials; particulates; scanning electron microscopy; surfactants; temperature; transmission electron microscopy; zinc oxide
Abstract:
... Hierarchical ZnO films consisting of nanoflower particulates are successfully grown by a solid–liquid interface reaction technique at room temperature without additives like surfactants, capping agent, or complexing agent. The structural, morphological, and photocatalytic properties of these films are studied using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), transmi ...
DOI:
10.1007/s10853-014-8313-1

11. A glycerol–water-based nanofluid containing graphene oxide nanosheets

Author:
Ali Ijam; A. Moradi Golsheikh; R. Saidur; P. Ganesan
Source:
Journal of materials science 2014 v.49 no.17 pp. 5934-5944
ISSN:
0022-2461
Subject:
Raman spectroscopy; X-ray diffraction; electrical conductivity; graphene; nanofluids; temperature; thermal conductivity; transmission electron microscopy; ultraviolet-visible spectroscopy
Abstract:
... Nanofluids are simply the dispersion of nanometer-sized particles in different fluids. Graphene oxide nanosheets (GONs) were prepared by exfoliating the graphite oxide. The GONs were investigated using Fourier transform-infrared spectroscopy, Raman spectroscopy, XRD analysis, high-resolution emission electron microscopy, transmission electron microscopy, and UV–visible spectroscopy. GONs/glycerol– ...
DOI:
10.1007/s10853-014-8312-2

12. A lithium poly(pyromellitic acid borate) gel electrolyte membrane for lithium-ion batteries

Author:
Guodong Xu; Yubao Sun; Rupesh Rohan; Yunfeng Zhang; Weiwei Cai; Hansong Cheng
Source:
Journal of materials science 2014 v.49 no.17 pp. 6111-6117
ISSN:
0022-2461
Subject:
batteries; electrochemistry; electrolytes; gels; lithium; nuclear magnetic resonance spectroscopy; polymerization; scanning electron microscopy; temperature; thermogravimetry
Abstract:
... Lithium poly(pyromellitic acid borate) (PPAB) was synthesized via polymerization of lithium tetramethanolatoborate and silylated pyromellitic acid. The synthesized material was characterized by Fourier transformation infrared spectroscopy,¹¹B nuclear magnetic resonance, scanning electron microscopy, and thermogravimetric analysis. And electrochemical characterizations were carried out on the blend ...
DOI:
10.1007/s10853-014-8341-x

13. Bacterial cellulose whisker as a reinforcing filler for carboxylated acrylonitrile-butadiene rubber

Author:
Jingyi Wang; Hongbing Jia; Jiajia Zhang; Lingfeng Ding; Yang Huang; Dongping Sun; Xuedong Gong
Source:
Journal of materials science 2014 v.49 no.17 pp. 6093-6101
ISSN:
0022-2461
Subject:
X-ray diffraction; acid hydrolysis; cellulose; crystal structure; glass transition temperature; latex; mixing; nanofibers; rubber; storage modulus; tensile strength; transmission electron microscopy
Abstract:
... Bacterial cellulose whisker (BCW) reinforced carboxylated acrylonitrile-butadiene rubber (xNBR) vulcanizates were fabricated by mixing BCW suspension with xNBR latex, followed by coagulating and vulcanization. The BCW, prepared from acid hydrolysis of bacterial cellulose, has as rod-like nanofiber structure according to transmission electron microscopy. BCW maintained its crystal structure in BCW/ ...
DOI:
10.1007/s10853-014-8336-7

14. Bio-inspired synthesis of mesoporous sílicas using large molecular weight poly-L-lysine at neutral pH

Author:
João Pires; Ana C. Fernandes; Romeu Avó
Source:
Journal of materials science 2014 v.49 no.17 pp. 6087-6092
ISSN:
0022-2461
Subject:
Bacillariophyceae; adsorption; ambient temperature; biochemical compounds; biomimetic materials; catalytic activity; drugs; electronics; molecular weight; pH; silica
Abstract:
... Among the various types of amorphous silica-based materials, those that have mesopores (pore widths between 2 and 50 nm) constitute an important group. Silica mesoporous materials have been considered in fields such as catalysis, adsorption, sensing, and electronics or, more recently in drug delivery. The synthesis of silica mesoporous materials usually involves corrosive reaction media and high t ...
DOI:
10.1007/s10853-014-8335-8

15. Contribution of the space charge to the grain boundary energy in yttria-stabilized zirconia

Author:
Jun Wang; Hans Conrad
Source:
Journal of materials science 2014 v.49 no.17 pp. 6074-6080
ISSN:
0022-2461
Subject:
cations; ceramics; electric field; energy; models; solutes; solvents; yttrium
Abstract:
... A model based on the effect of a modest applied dc electric field on grain growth is proposed for the contribution of the space charge to the grain boundary (GB) energy in 3 mol % yttria-stabilized zirconia (3 YSZ). The model considers that the total GB energy γ0b (the capillary driving force for grain growth) consists of three major components: (a) γΣb due to the misorientation between neighborin ...
DOI:
10.1007/s10853-014-8331-z

16. Dynamic morphology instability in epitaxial ZnO/AZO (aluminum-doped ZnO) core–shell nanowires

Author:
Hong-Bo Wang; Fei Ma; Qian-Qian Li; Miao Wang; Jia-Bin Liu; Meng-Long Sun; Da-Yan Ma; Hong-Tao Wang; Ke-Wei Xu
Source:
Journal of materials science 2014 v.49 no.17 pp. 6020-6028
ISSN:
0022-2461
Subject:
engineering; nanowires; temperature; zinc oxide
Abstract:
... Misfit strain relaxation-induced morphology instability is usually observed in epitaxial heterostructures at high temperatures. In this paper, we report that this morphology instability can occur even at room temperature in epitaxial ZnO/AZO (Al-doped ZnO) core–shell nanowires (NWs). As a result, densely distributed ZnO nanodots (NDs) were self-assembled on the NWs. The growth of NDs was slowed do ...
DOI:
10.1007/s10853-014-8322-0

17. Effect of aluminum on microstructural evolution during hot deformation of TX32 magnesium alloy

Author:
C. Dharmendra; K. P. Rao; F. Zhao; Y. V. R. K. Prasad; N. Hort; K. U. Kainer
Source:
Journal of materials science 2014 v.49 no.17 pp. 5885-5898
ISSN:
0022-2461
Subject:
alloys; aluminum; calcium; cracking; deformation; magnesium; microstructure; temperature; texture; tin; transmission electron microscopy
Abstract:
... The effect of Al (0.4 and 1 wt%) addition on the hot deformation behavior of the Mg–3Sn–2Ca (TX32) alloy has been studied with the help of processing maps generated in the temperature and strain rate ranges of 300–500 °C and 0.0003–10 s⁻¹. The deformed specimens have been examined as regards changes in texture and microstructure using electron back scatter diffraction and transmission electron mic ...
DOI:
10.1007/s10853-014-8300-6

18. Effect of heat-treatment on phase stability and grain coarsening in a powder-processed Al–Ni–Co–Zr–Y alloy

Author:
M. A. Gordillo; B. Bedard; T. J. Watson; M. Aindow
Source:
Journal of materials science 2014 v.49 no.17 pp. 5866-5877
ISSN:
0022-2461
Subject:
X-ray diffraction; alloys; aluminum; atomization; cobalt; electron microscopy; extrusion; heat treatment; microstructure; nickel; temperature; yttrium; zirconium
Abstract:
... Processing of Al alloys via metastable amorphous intermediates can give much higher volume fractions of dispersed strengthening phases than in conventional precipitation- or dispersion-hardened systems. Here, we report a study on an Al–Ni–Co–Zr–Y alloy processed by gas atomization and consolidated/devitrified by warm extrusion. X-ray diffraction and electron microscopy are used to reveal the effec ...
DOI:
10.1007/s10853-014-8297-x

19. Effect of silver nanoparticle embedment on the frequency dispersive conductivity and electrical relaxation dynamics in dodecylbenzenesulfonic acid-doped polyaniline

Author:
Swarup Biswas; Bula Dutta; Subhratanu Bhattacharya
Source:
Journal of materials science 2014 v.49 no.17 pp. 5910-5921
ISSN:
0022-2461
Subject:
dielectric spectroscopy; nanocomposites; nanosilver; temperature
Abstract:
... The present work aims at studying electrical relaxations in silver–polyaniline nanocomposites using dielectric spectroscopy. The nanocomposites of dodecylbenzenesulfonic acid-doped polyaniline (PANI) with different concentrations of silver nanoparticles (~6–12 nm) are synthesized by simple wet-chemical route. The temperature dependence of dc conductivity in all the samples follows three-dimensiona ...
DOI:
10.1007/s10853-014-8305-1

20. Effects of molybdenum volume fraction and silica/molybdenum particle-size ratio on relative bulk density and electrical conductivity of silica–molybdenum composites fabricated by spark plasma sintering

Author:
Takuya Honma; Junichi Tatami
Source:
Journal of materials science 2014 v.49 no.17 pp. 5878-5884
ISSN:
0022-2461
Subject:
bulk density; electrical conductivity; mixing; molybdenum; particle size; powders; raw materials; silica; temperature
Abstract:
... SiO₂–Mo composite compact bodies were fabricated by mixing SiO₂and Mo and then subjected to spark plasma sintering (SPS). In this study, the effects of the volume fraction of Mo and the SiO₂/Mo particle-size ratio of the compact bodies on the relative bulk density and electrical conductivity of the obtained sintered bodies are discussed. The relative bulk density tended to decrease with increasing ...
DOI:
10.1007/s10853-014-8298-9