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  Subjects -> ENGINEERING (Total: 2254 journals)
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ENGINEERING (1196 journals)            First | 1 2 3 4 5 6 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
Propulsion and Power Research     Open Access   (Followers: 22)
Purinergic Signalling     Hybrid Journal   (Followers: 1)
Quaderns d’Història de l’Enginyeria     Open Access  
Quality and Reliability Engineering International     Hybrid Journal   (Followers: 12)
Quality Engineering     Hybrid Journal   (Followers: 9)
Radiochimica Acta     Hybrid Journal   (Followers: 5)
Rapid Prototyping Journal     Hybrid Journal   (Followers: 3)
Rare Metals     Hybrid Journal  
Reactive and Functional Polymers     Hybrid Journal   (Followers: 5)
Recent Patents on Engineering     Full-text available via subscription   (Followers: 3)
Recent Patents on Nanotechnology     Full-text available via subscription   (Followers: 3)
Recherche Transports Sécurité     Hybrid Journal   (Followers: 1)
Redes de Ingeniería     Open Access  
Regional Maritime University Journal     Full-text available via subscription   (Followers: 2)
Regular and Chaotic Dynamics     Hybrid Journal  
Rem : Revista Escola de Minas     Open Access   (Followers: 1)
Remote Sensing     Open Access   (Followers: 36)
Remote Sensing Letters     Hybrid Journal   (Followers: 36)
Requirements Engineering     Hybrid Journal   (Followers: 3)
Research Ideas and Outcomes     Open Access  
Research in Engineering Design     Hybrid Journal   (Followers: 11)
Research Journal of Nanoscience and Nanotechnology     Open Access   (Followers: 20)
Research Works of Air Force Institute of Technology     Open Access   (Followers: 1)
Resonance     Hybrid Journal   (Followers: 25)
Reviews in Advanced Sciences and Engineering     Partially Free   (Followers: 2)
Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica     Open Access  
Revista Brasileira de Engenharia Agrícola e Ambiental     Open Access   (Followers: 1)
Revista Ciencias e Ingeniería al Día     Open Access  
Revista CINTEX     Open Access  
Revista Cubana de Ingeniería     Open Access  
Revista de Engenharia da Universidade Católica de Petrópolis     Open Access  
Revista de Ingeniería     Open Access  
Revista de Ingenieria Sismica     Open Access  
Revista de Investigación, Desarrollo e Innovación     Open Access  
Revista EIA     Open Access   (Followers: 1)
Revista Facultad de Ingeniería     Open Access   (Followers: 1)
Revista Facultad de Ingenieria - Universidad de Tarapaca     Open Access  
Revista Facultad de Ingeniería Universidad de Antioquia     Open Access   (Followers: 1)
Revista Iberoamericana de Automática e Informática Industrial RIAI     Open Access  
Revista Informador Técnico     Open Access   (Followers: 1)
Revista Ingenieria de Construcción     Open Access  
Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería     Open Access  
Revista Logos Ciencia & Tecnología     Open Access  
Revista Petra     Open Access  
Revue de Métallurgie     Full-text available via subscription  
Russian Engineering Research     Hybrid Journal  
Russian Journal of Non-Ferrous Metals     Hybrid Journal   (Followers: 22)
Russian Microelectronics     Hybrid Journal   (Followers: 1)
Sadhana     Open Access   (Followers: 7)
Safety Science     Hybrid Journal   (Followers: 25)
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access   (Followers: 2)
Science & Technique     Open Access  
Science and Engineering Ethics     Hybrid Journal   (Followers: 8)
Science and Technology     Open Access   (Followers: 2)
Science China Technological Sciences     Hybrid Journal  
Science Journal of Volgograd State University. Technology and innovations     Open Access  
Science Progress     Full-text available via subscription   (Followers: 3)
Scientia cum Industria     Open Access  
Scientific Journal of Control Engineering     Open Access   (Followers: 1)
Scientific Journal of Review     Open Access  
Sealing Technology     Full-text available via subscription   (Followers: 1)
Securitas Vialis     Hybrid Journal  
Security and Communication Networks     Hybrid Journal   (Followers: 3)
Selcuk University Journal of Engineering, Science and Technology     Open Access  
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 46)
Semiconductors     Hybrid Journal  
Semiconductors and Semimetals     Full-text available via subscription  
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 1)
Sensor Letters     Full-text available via subscription   (Followers: 2)
Sensors     Open Access   (Followers: 14)
Separation and Purification Technology     Hybrid Journal   (Followers: 10)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Shock and Vibration     Hybrid Journal   (Followers: 8)
SIAM Journal on Applied Dynamical Systems     Hybrid Journal   (Followers: 2)
SIAM Journal on Mathematical Analysis     Hybrid Journal   (Followers: 3)
SIAM Journal on Matrix Analysis and Applications     Hybrid Journal   (Followers: 1)
SIAM Journal on Numerical Analysis     Hybrid Journal   (Followers: 4)
SIAM Journal on Optimization     Hybrid Journal   (Followers: 8)
SIAM Review     Hybrid Journal   (Followers: 6)
SILICON     Hybrid Journal  
Sistemas & Telemática     Open Access   (Followers: 1)
Sleep and Biological Rhythms     Hybrid Journal   (Followers: 6)
Small     Hybrid Journal   (Followers: 11)
Smart Grid     Open Access  
Soft Computing     Hybrid Journal   (Followers: 7)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 53)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 12)
Soldagem & Inspeção     Open Access  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 9)
SourceOCDE Developpement urbain, rural et regional     Full-text available via subscription   (Followers: 1)
SourceOCDE Energie     Full-text available via subscription  
SourceOECD Energy     Full-text available via subscription  
SourceOECD Science and Technology Statistics - SourceOCDE Base de donnees des sciences et de la technologie     Full-text available via subscription  
SourceOECD Transport     Full-text available via subscription   (Followers: 3)
SourceOECD Urban, Rural and Regional Development     Full-text available via subscription   (Followers: 1)
South African Computer Journal     Full-text available via subscription  
South African Journal of Agricultural Extension     Open Access   (Followers: 4)
South African Journal of Science     Open Access   (Followers: 3)
Sports Engineering     Hybrid Journal   (Followers: 3)
Stahlbau     Hybrid Journal   (Followers: 3)
Steel in Translation     Hybrid Journal  
Steel Research International     Hybrid Journal   (Followers: 24)
Stochastic Analysis and Applications     Hybrid Journal   (Followers: 2)
Stochastic Processes and their Applications     Hybrid Journal   (Followers: 5)
Stochastics and Dynamics     Hybrid Journal  
Strain     Hybrid Journal   (Followers: 2)
Strategic Planning for Energy and the Environment     Hybrid Journal   (Followers: 4)
Studies in Engineering and Technology     Open Access  
Studies in Interface Science     Full-text available via subscription   (Followers: 1)
Studies in Logic and Practical Reasoning     Full-text available via subscription  
Studies in Surface Science and Catalysis     Full-text available via subscription   (Followers: 1)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Surface Engineering     Hybrid Journal   (Followers: 3)
Surface Review and Letters     Hybrid Journal   (Followers: 1)
Surface Science Reports     Full-text available via subscription   (Followers: 15)
Survey Review     Hybrid Journal   (Followers: 6)
Surveying and Land Information Science     Full-text available via subscription   (Followers: 2)
Sustainability Science     Hybrid Journal   (Followers: 7)
Sustainability Science and Engineering     Full-text available via subscription   (Followers: 4)
Sustainable Management of Sediment Resources     Full-text available via subscription  
Swiss Journal of Geosciences     Hybrid Journal  
Symmetry     Open Access  
Synthesis Lectures on Algorithms and Software in Engineering     Full-text available via subscription  
Synthesis Lectures on Antennas     Full-text available via subscription   (Followers: 5)
Synthesis Lectures on Biomedical Engineering     Full-text available via subscription  
Synthesis Lectures on Computational Electromagnetics     Full-text available via subscription   (Followers: 4)
Synthesis Lectures on Energy and the Environment: Technology, Science, and Society     Full-text available via subscription   (Followers: 2)
Synthesis Lectures on Engineering     Full-text available via subscription  
Synthesis Lectures on Global Engineering     Full-text available via subscription  
Synthesis Lectures on Professionalism and Career Advancement for Scientists and Engineers     Full-text available via subscription   (Followers: 1)
Synthetic Metals     Hybrid Journal   (Followers: 4)
Systems Engineering     Hybrid Journal   (Followers: 6)
Systems Engineering Procedia     Open Access  
Systems Research Forum     Hybrid Journal  
Systems Science & Control Engineering     Open Access   (Followers: 5)
Techno.Com     Open Access  
Technological Engineering     Open Access  
Technologies     Open Access   (Followers: 1)
TECHNOLOGY     Hybrid Journal  
Technology and Innovation     Full-text available via subscription   (Followers: 3)
Technology in Society     Hybrid Journal   (Followers: 4)
Technometrics     Full-text available via subscription   (Followers: 6)
Tecnologia, Ciencia, Educacion     Open Access   (Followers: 1)
Tecnura     Open Access  
Telecommunications Policy     Hybrid Journal   (Followers: 24)
Terahertz Science and Technology, IEEE Transactions on     Hybrid Journal   (Followers: 2)
Textile Science and Technology     Full-text available via subscription   (Followers: 3)
The Journal of Computational Multiphase Flows     Full-text available via subscription  
The Journal of Supercomputing     Hybrid Journal   (Followers: 1)
The Scientific World Journal     Open Access  
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 12)
Theoretical Issues in Ergonomics Science     Hybrid Journal   (Followers: 3)
Thermal Engineering     Hybrid Journal   (Followers: 6)
Tikrit Journal of Engineering Science     Open Access  
tm - Technisches Messen     Hybrid Journal   (Followers: 2)
Topics in Catalysis     Hybrid Journal   (Followers: 1)
Traffic Injury Prevention     Hybrid Journal   (Followers: 61)
TRANSACTIONS of the VŠB - Technical University of Ostrava, Safety Engineering Series     Open Access   (Followers: 1)
Transactions of Tianjin University     Full-text available via subscription  
Transport and Telecommunication Journal     Open Access   (Followers: 4)
Transport World Africa     Full-text available via subscription   (Followers: 3)
Transportation Research Record : Journal of the Transportation Research Board     Full-text available via subscription   (Followers: 34)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 4)
Trends in Applied Sciences Research     Open Access   (Followers: 1)
Tribology in Industry     Open Access   (Followers: 1)
Tribology International     Hybrid Journal   (Followers: 41)
Tribology Letters     Hybrid Journal   (Followers: 5)
Tribology Transactions     Hybrid Journal   (Followers: 33)
Tribotest     Hybrid Journal  
Tropical Science     Hybrid Journal   (Followers: 1)
Turkish Journal of Engineering and Environmental Sciences     Open Access   (Followers: 1)
Ultramicroscopy     Hybrid Journal   (Followers: 2)
Uludağ University Journal of The Faculty of Engineering     Open Access  
Universal Journal of Applied Science     Open Access   (Followers: 2)
Universal Journal of Engineering Science     Open Access   (Followers: 1)
Utilities Policy     Hybrid Journal   (Followers: 2)
Vacuum     Hybrid Journal   (Followers: 12)
Virtual and Physical Prototyping     Hybrid Journal   (Followers: 3)
Visualization in Engineering     Open Access  
Walailak Journal of Science and Technology     Open Access  
Waste and Biomass Valorization     Hybrid Journal   (Followers: 1)
Waste Management Series     Full-text available via subscription   (Followers: 2)
Waves in Random and Complex Media     Hybrid Journal  
Waves, Wavelets and Fractals     Open Access  
Wear     Hybrid Journal   (Followers: 28)
Welding in the World     Hybrid Journal   (Followers: 2)
West African Journal of Industrial and Academic Research     Open Access   (Followers: 1)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 11)
World Journal of Engineering     Full-text available via subscription   (Followers: 3)
World Journal of Engineering and Technology     Open Access  
World Journal of Environmental Engineering     Open Access   (Followers: 2)
World Pumps     Full-text available via subscription   (Followers: 2)
World Science and Technology     Full-text available via subscription   (Followers: 1)
ZDM     Hybrid Journal  
Zede Journal     Open Access  
Zeitschrift fur Energiewirtschaft     Hybrid Journal   (Followers: 1)

  First | 1 2 3 4 5 6 | Last

Journal Cover Ionics
  [SJR: 0.486]   [H-I: 36]   [1 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1862-0760 - ISSN (Online) 0947-7047
   Published by Springer-Verlag Homepage  [2336 journals]
  • Grain size effects on dynamics of Li-ions in Li 3 V 2 (PO 4 ) 3
           glass-ceramic nanocomposites
    • Authors: A. M. Al-Syadi; M. S. Al-Assiri; Hassan M. A. Hassan; M. M. El-Desoky
      Pages: 2281 - 2290
      Abstract: Abstract Li3V2(PO4)3 glass-ceramic nanocomposites, based on 37.5Li2O-25V2O5-37.5P2O5 mol% glass, were successfully prepared via heat treatment (HT) process. The structure and morphology were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). XRD patterns exhibit the formation of Li3V2(PO4)3 NASICON type with monoclinic structure. The grain sizes were found to be in the range 32–56 nm. The effect of grain size on the dynamics of Li+ ions in these glass-ceramic nanocomposites has been studied in the frequency range of 20 Hz–1 MHz and in the temperature range of 333–373 K and analyzed by using both the conductivity and modulus formalisms. The frequency exponent obtained from the power law decreases with the increase of temperature, suggesting a weaker correlation among the Li+ ions. Scaling of the conductivity spectra has also been performed in order to obtain insight into the relaxation mechanisms. The imaginary modulus spectra are broader than the Debye peak-width, but are asymmetric and distorted toward the high frequency region of the maxima. The electric modulus data have been fitted to the non-exponential Kohlrausch–Williams–Watts (KWW) function and the value of the stretched exponent β is fairly low, suggesting a higher ionic conductivity in the glass and its glass-ceramic nanocomposites. The advantages of these glass-ceramic nanocomposites as cathode materials in Li-ion batteries are shortened diffusion paths for Li+ ions/electrons and higher surface area of contact between cathode and electrolyte.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1772-4
      Issue No: Vol. 22, No. 12 (2016)
  • Evolution of crystal structure and electrochemical performance of layered
           Li 1.20 Ti 0.44 Cr 0.36 O 2 /C cathode materials with cycling
    • Authors: Shuai Li; Hongbo Liu; Yuxi Chen
      Pages: 2291 - 2298
      Abstract: Abstract Carbon-coated layered Li1.20Ti0.44Cr0.36O2/C and pristine Li1.20Ti0.44Cr0.36O2 cathode materials have been synthesized through a sol–gel method followed by high-temperature calcination. Their electrochemical performances have been evaluated, which indicate that the Li1.20Ti0.44Cr0.36O2/C exhibits much higher cyclic stability and capacity than the pristine one. The initial delithiation capacity of the Li1.20Ti0.44Cr0.36O2/C can reach 217.1 mAh g−1. The reversible capacity retention is 94 % after 100 cycles at current density of 23 mA g−1. Ex situ X-ray diffraction and electrochemistry impedance spectroscopy coupled with impedance fitting have been employed to reveal evolution of the crystal structure and the electrochemical kinetics of the Li1.20Ti0.44Cr0.36O2/C with delithiation/lithiation cycling. The results indicate that the cation layers of the Li1.20Ti0.44Cr0.36O2/C experience order to disorder transition. The abrupt delithiation capacity fading and potential drop after the initial cycle are resulted from the order to disorder transition accompanying with steep increase of the charge transfer resistance and decrease of the exchange current density and the Li-ion diffusion coefficient simultaneously.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1783-1
      Issue No: Vol. 22, No. 12 (2016)
  • The properties research of ferrum additive on Li [Ni 1/3 Co 1/3 Mn 1/3 ] O
           2 cathode material for lithium ion batteries
    • Authors: Enshan Han; Min Lu; Lingzhi Zhu; Guangquan Zhang; Sen Chen
      Pages: 2299 - 2305
      Abstract: Abstract Li[Ni1/3Co(1-x)/3Mn1/3Fe x/3] O2(x = 0.0, 0.1, 0.3, 0.5, 0.7, and 0.9) cathode materials have been synthesized via hydroxide co-precipitation method followed by a solid state reaction. Thermogravimetry (TG) and differential thermal analysis (DTA) measurements were utilized to determine the calcination temperature of precursor sample. The crystal structure features were characterized by X-ray diffraction (XRD). The electrochemical properties of Li[Ni1/3Co(1-x)/3Mn1/3Fe x/3]O2 were compared by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy(EIS), and galvanostatic charge/discharge test. Electrochemical test results indicate that Li[Ni1/3Co0.9/3Mn1/3Fe0.1/3] O2 decrease charge transfer resistance and enhance Li+ ion diffusion velocity and thus improve cycling and high-rate capability compared with Li[Ni1/3Co1/3Mn1/3]O2. The initial discharge specific capacity of Li[Ni1/3Co0.9/3Mn1/3Fe0.1/3] O2 was 178.5 mAh/g and capacity retention was 87.11 % after 30 cycles at 0.1C, with the battery showing good cycle performance.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1786-y
      Issue No: Vol. 22, No. 12 (2016)
  • Tin oxide nano-flower-anchored graphene composites as high-performance
           anode materials for lithium-ion batteries
    • Authors: Jing Li; Jianqiang Guo; Xia Zhang; Rufang Peng
      Pages: 2307 - 2313
      Abstract: Abstract The SnO2 nano-flower/graphene (SnO2-NF/GN) composites were synthesized by using graphene (GN) and SnO2 nano-flower (SnO2-NF). Among them, the SnO2-NFs were prefabricated by using sodium hydroxide and stannic chloride pentahydrate (SnCl4·5H2O) as raw materials. The results of SEM show that the SnO2-NFs are uniformly dispersed on the surface of GN. Furthermore, compared with the pure SnO2, the as-prepared SnO2-NF/GN composites displayed superior cycle performace and high rate capability. The SnO2-NF/GN composite delivers a specific capacity of 650 mAh g−1 after 60 cycles and an excellent rate capability of 480 mAh g−1 at 2000 mA g−1.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1764-4
      Issue No: Vol. 22, No. 12 (2016)
  • Influence of post-calcination treatment on the spinel lithium titanium
           oxide anode material for lithium ion batteries
    • Authors: Jie Liu; Ke-jun Deng; Chen-ge Yang; Bo Liu; Chang Li; Zhen-hui Yao; Ling Su
      Pages: 2321 - 2329
      Abstract: Abstract The influence of post-calcination treatment on spinel Li4Ti5O12 anode material is extensively studied combining with a ball-milling-assisted rheological phase reaction method. The post-calcinated Li4Ti5O12 shows a well distribution with expanded gaps between particles, which are beneficial for lithium ion mobility. Electrochemical results exhibit that the post-calcinated Li4Ti5O12 delivers an improved specific capacity and rate capability. A high discharge capacity of 172.9 mAh g−1 and a reversible charge capacity of 171.1 mAh g−1 can be achieved at 1 C rate, which are very close to its theoretical capacity (175 mAh g−1). Even at the rate of 20 C, the post-calcinated Li4Ti5O12 still delivers a quite high charge capacity of 124.5 mAh g−1 after 50 cycles, which is much improved over that (43.9 mAh g−1) of the pure Li4Ti5O12 without post-calcination treatment. This excellent electrochemical performance should be ascribed to the post-calcination process, which can greatly improve the lithium ion diffusion coefficient and further enhance the electrochemical kinetics significantly.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1779-x
      Issue No: Vol. 22, No. 12 (2016)
  • A comparative study of Li 2 CO 3 modified carbon microbead anodes prepared
           by different synthetic routes for lithium-ion battery
    • Authors: Shu-Dan Li; Ting Li; Chen-Yi Wang; Kun Gao
      Pages: 2331 - 2339
      Abstract: Abstract Li2CO3 modified carbon microbead composites (LCO/CMB-T) with different covering amount are prepared by solvent evaporation and dipping method. LiCH3COO are first used as lithium source, which can provide a precise control of Li2CO3 amount through varying dipping times or solution concentration. The morphology, structure, and covering amount are characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), and atomic absorption spectrometer (AAS). The dipping process can produce the samples with better surface coverage, more uniform coating, and higher Li2CO3 crystallinity, while the appropriate amount of Li2CO3 can help to decrease initial irreversible capacity and improve cell performance. Here, the sample with 1.07 % Li2CO3 prepared by dipping method shows the highest initial discharge capacity of 353.7 mAh g−1 and coulombic efficiency of 89.5 %. The capacity retention is up to 82.1 % after 30 cycles.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1787-x
      Issue No: Vol. 22, No. 12 (2016)
  • A low-cost, high-energy polymer lithium-sulfur cell using a composite
           electrode and polyethylene oxide (PEO) electrolyte
    • Authors: Lorenzo Carbone; Jusef Hassoun
      Pages: 2341 - 2346
      Abstract: Abstract Herein, we report a polymer cell using high-energy lithium metal anode, a composite sulfur-carbon cathode, and polyethylene oxide (PEO)-lithium trifluoromethan sulfonate (LiCF3SO3) electrolyte. The limited cost of raw materials as well as the very simple synthetic procedures, involving planetary ball milling (for S-C cathode) and solvent casting (for PEO-electrolyte), are expected to reflect into remarkable reduction of the economic impact of the proposed battery. Furthermore, the high energy of the Li-S cell and safety of the polymer configuration represent additional bonuses of the system. The S-C material, revealing a maximum capacity as high as 700 mAh g−1 in liquid electrolyte, is employed in a lithium-sulfur battery with the polymer configuration. The polymer cell delivers a capacity of 450 mAh g−1 at a voltage of about 2 V; hence, a theoretical energy density of 900 Wh kg−1 that may reflect into a high practical value, suitable for energy storage applications.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1755-5
      Issue No: Vol. 22, No. 12 (2016)
  • Solid state synthesis of nonstoichiometric Bi 2 WO 6 /Bi 2 O 3 composites
           as visible-light photocatalyst
    • Authors: Daijiang Peng; Zhengguang Zou; Fei Long; Jinyun He; Tian Zhang
      Pages: 2347 - 2353
      Abstract: Abstract Nonstoichiometric Bi2WO6 photocatalyst with the composition of Bi2 + x WO6 + 1.5x (−0.25 ≤ x ≤ 1) wa synthesized by a facile solid state reaction method. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-vis absorption spectrum. The Bi2.5WO6.75 photocatalyst showed excellent visible-light-driven photocatalytic performance; nearly 100 % of RhB (10 ppm, pH = 3 ~ 4) was decomposed within 25 min, which demonstrated that nonstoichiometric semiconductors could be an efficient visible-light-driven photocatalyst.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1762-6
      Issue No: Vol. 22, No. 12 (2016)
  • Influence of Zn/Co ratio on dielectric behavior of Na 2 Zn 1 ‐ x Co
           x P 2 O 7 glasses
    • Authors: Mohamed Kharroubi; Hamza Assad; Sebastien Balme; Lakhdar Gacem; Cherif Maghni
      Pages: 2355 - 2361
      Abstract: Abstract A series of zinc phosphate glass doped with cobalt Na2Zn(1 − x)CoxP2O7 (x = 0, 1, 2 and 5 mol%) was synthesized. These glasses were characterized by both infrared and large broadband dielectric spectroscopy. Infrared spectra indicate the increase of Zn/Co ratio creates defect in phosphate network due to the depolymeration of phosphate anions. The dc conductivity increases and activation energy decreases with the amount of cobalt ions in the glass network. The impedance measurements reveal that the total conductivity follows Jonscher’s power law. The dielectric constant and dielectric loss increased with the temperature and decreased with the frequency whatever the cobalt proportion.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1770-6
      Issue No: Vol. 22, No. 12 (2016)
  • High-temperature complex impedance and modulus spectroscopic studies of
           doped Na 0.5 Bi 0.5 TiO 3 -BaTiO 3 ferroelectric ceramics
    • Authors: Ch Sameera Devi; M. Buchi Suresh; G. S. Kumar; G. Prasad
      Pages: 2363 - 2377
      Abstract: Abstract Lead-free Na0.5Bi0.5TiO3 (NBT) and (1 − x)Na0.5Bi0.5TiO3 + xBaTiO3 with x = 0.1 and 0.2 (where x = 0.1 and 0.2 are named as NBT1 and NBT2, respectively), (1 − y)Na0.5Bi0.5TiO3 + yBa0.925Nd0.05TiO3 with y = 0.1 and 0.2 (where y = 0.1 and 0.2 are named as NBT3 and NBT4, respectively)-based relaxor ferroelectric ceramics were prepared using the sol-gel method. The crystal structure was investigated by X-ray diffraction (XRD) at room temperature (RT). The XRD patterns confirmed the presence of the rhombohedral phase in all the samples. The electrical properties of the present NBT-based samples were investigated by complex impedance and the modulus spectroscopy technique in the temperature range of RT–600 °C. The AC conductivity was found to increase with the substitution of Ba2+ ions to the NBT sample whereas it significantly decreased with the addition of Nd3+ ions. The more anion vacancies in Ba-added samples and the lower anion vacancies in Nd-added samples were found to be responsible for higher and lower conductivities, respectively.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1781-3
      Issue No: Vol. 22, No. 12 (2016)
  • Influence of ion–ion correlation on Na+ transport in Na2Ni2TeO6:
           molecular dynamics study
    • Authors: Kartik Sau
      Pages: 2379 - 2385
      Abstract: Abstract Molecular dynamics (MD) study of Na+ transport in Na2Ni2TeO6 is performed systematically with varying strength of Na+–Na+ short range repulsions to understand the physical principle governing ion transport mechanism. Na+ diffusion is enhanced by nearly an order of magnitude with reduced Na+–Na+ short range repulsion within the studied range. A similar behavior is also observed in other systems, e.g., AgI and Na2Zn2TeO6, where mobile ions are located closely. The Na+ ion occupancy in Na2Ni2TeO6 shows a significant shift from Na1 to Na2 sites gaining some degree of correlation. The study also emphasizes how mobile ion size influences the ionic diffusion. The fresh insight such as microscopic migration pathways, energy barriers, and jumping mechanism of Na+ are derived from the study.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1782-2
      Issue No: Vol. 22, No. 12 (2016)
  • Effects of ionic liquid on the hydroxylpropylmethyl cellulose (HPMC) solid
           polymer electrolyte
    • Authors: Mee Yoke Chong; Chiam-Wen Liew; Arshid Numan; K. Yugal; K. Ramesh; H. M. Ng; T. V. Chong; S. Ramesh
      Pages: 2421 - 2430
      Abstract: Abstract Biodegradable solid polymer electrolyte (SPE) is prepared by solution-casting technique using low-cost cellulose derivative, hydroxypropylmethyl cellulose (HPMC) as a host polymer. Owing to the hydrophobic nature of this polymer, it is predicted to exhibit low ionic conductivity upon addition of magnesium trifluoromethanesulfonate (MgTf2) salt. Therefore, ionic liquid (IL), 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMIMTf), is added in order to enhance its ionic conductivity. Based on the findings, the ionic conductivity at room temperature and the dielectric behaviors of the SPE complex improved upon incorporation of 40 wt.% IL. On top of that, addition of IL reduces the degree of crystallinity and the glass transition temperature (T g ) of the SPE. The conductivity-temperature plot revealed that the transportation of ions in these films obey Arrhenius theory. The interaction between SPE complex, MgTf2 salt, and BMIMTf is investigated by means of Fourier transform infrared (FTIR) spectroscopy through the change in peak intensity around 3413, 1570, and 1060 cm−1, which are responsible for –OH stretching band, C–C and C–N bending modes of cyclic BMIM+, and C–O–C stretching band, respectively.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1768-0
      Issue No: Vol. 22, No. 12 (2016)
  • Mathematical modeling of field-assisted Li ion conduction in nanocomposite
           solid polymer electrolyte systems
    • Authors: V . R. Sunitha; S. Radhakrishnan
      Pages: 2431 - 2436
      Abstract: Abstract Nanocomposite solid polymer electrolyte films were prepared to study the effect of electric field on the ionic conductivity. The studies were carried out by varying the electric field from 0 to 100 V cm−1 at different temperatures and the results shows that conductivity increases with increase in electric field and temperature. A mathematical model is proposed to describe the electric field and temperature-dependent ionic conductivity in nanocomposite solid polymer electrolyte systems. The correlation between the proposed equation and the experimental observations showed high degree of correlation.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1775-1
      Issue No: Vol. 22, No. 12 (2016)
  • Impedance and dielectric studies of nanocomposite polymer electrolyte
           systems using MMT and ferroelectric fillers
    • Authors: V. R. Sunitha; S. Radhakrishnan
      Pages: 2437 - 2446
      Abstract: Abstract Impedance and dielectric properties of nanocomposite polymer electrolyte systems modified with nano size MMT and ferroelectric fillers have been investigated for varying lithium to oxygen ratios. The changes in the structural properties of the electrolyte samples were characterized by X-ray diffraction (XRD) and differential scanning calorimetric (DSC) technique. The ion transport number estimated by DC polarization technique is found to be between 0.86 and 0.95. The bulk conductivities of nanocomposite polymer electrolyte films were studied using impedance spectroscopic technique. The impedance plot shows high frequency semicircle, due to the bulk effect of sample and maximum ionic conductivity of 2.15 × 10−4 Scm−1 was observed for (PEO)4LiCBSM at 323 K with lithium to oxygen ratio 1: 4. The complex impedance data was used to evaluate ionic conductivity and dielectric relaxation process, to understand the ion transport mechanism in these systems.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1784-0
      Issue No: Vol. 22, No. 12 (2016)
  • Carbon nanotube β-cyclodextrin-modified electrode for quantification of
           cocaine in seized street samples
    • Authors: J. M. P. J. Garrido; F. Borges; C. M. A. Brett; E. M. P. J. Garrido
      Pages: 2511 - 2518
      Abstract: Abstract Detection and quantification of cocaine is a key tool in fields such as police apprehensions and the fight against drug trafficking. Thus, a simple, fast and inexpensive electroanalytical methodology for the determination of cocaine in seized street samples has been developed, employing linear sweep voltammetry. The method is based on the use of a glassy carbon (GC) electrode modified by a combination of multi-walled carbon nanotubes (MWCNT) with β-cyclodextrin (β-CD) incorporated in a polyaniline film. The proposed method shows high reproducibility, repeatability and specificity. Under optimal conditions, the β-CD/MWCNT-modified GC electrode gives a detection limit of 1.02 μM cocaine. The results obtained are in good agreement with those obtained by the high-performance liquid chromatography reference method. The new methodology proposed has excellent potential as the basis of a portable analytical sensor for on-site screening of cocaine in seized street samples.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1765-3
      Issue No: Vol. 22, No. 12 (2016)
  • Comparative study for voltammetric investigation and trace determination
           of pramipexole at bare and carbon nanotube-modified glassy carbon
    • Authors: Burcin Bozal-Palabiyik; Bengi Uslu
      Pages: 2519 - 2528
      Abstract: Abstract A sensitive, simple, and reproducible method was developed in this study for the determination of pramipexole, and in doing that, a glassy carbon electrode modified with –COOH-functionalized multi-walled carbon nanotube was utilized. The modified electrode was compared with a bare glassy carbon electrode in order to prove the sensitivity of the developed sensor. Cyclic, differential pulse, and adsorptive stripping differential pulse voltammetric techniques were used to investigate the oxidation behavior and stripping techniques were used for the determination of pramipexole. Based on optimum experimental conditions, calibration and partial validation studies were realized for bare and modified electrodes. As a result, the values of limit of detection and quantification were determined as be 2.38 × 10−10 and 7.93 × 10−10 M for bare and 1.06 × 10−10 and 3.52 × 10−10 M for modified glassy carbon electrodes, respectively. The applicability of the bare and modified electrodes was demonstrated for the determination of pramipexole in pharmaceutical dosage forms. The selectivity of the developed method was considered in the presence of Ca2+, Na+, K+, and glucose, ascorbic acid, uric acid, and dopamine. Interfering agents except uric acid did not affect pramipexole determination considerably.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1774-2
      Issue No: Vol. 22, No. 12 (2016)
  • On the sol-gel synthesis and characterization of (BaSr)(CeZr)O 3 -based
           fuel cell electrolytes
    • Authors: Shivendra Kumar Jaiswal; Sung Min Choi; Jongsup Hong; Kyung Joong Yoon; Ji-Won Son; Byung-Kook Kim; Hae-Weon Lee; Jong-Ho Lee
      Pages: 2529 - 2538
      Abstract: Abstract Proton-conducting ceramics have been very useful due to their potential applications in fuel cells, electrolysers, and hydrogen membranes. The proton-conducting fuel cell electrolytes (Ba1−x Sr x )(Ce0.75Zr0.10Y0.15)O3−δ (x = 0–1.0) have been synthesized through sol-gel method and characterized with regard to phase, structural stability, and electrical conductivity. The structural behavior has been investigated by X-ray diffraction and theRaman spectroscopy. The XRD analysis shows perovskite-type cubic structure and values of lattice parameter lie in the range of ~4.29 to ~4.40 Å. Strontium substitution leads to lattice contraction, strengthening of the metal-oxygen bond, and increase of oxygen content (3−δ). The Raman spectra show different types of stretching/vibrations corresponding to octahedral, M-O stretching, and oxygen vacancies. The electrical conduction was found to be protonic in nature and decreases with increase of strontium insertion. The composition x = 0.4 shows relatively better structural stability against humid air/boiling water condition while inferior in carbon dioxide atmosphere.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1801-3
      Issue No: Vol. 22, No. 12 (2016)
  • Flower-like Ni 3 (NO 3 ) 2 (OH) 4 @Zr-metal organic framework (UiO-66)
           composites as electrode materials for high performance pseudocapacitors
    • Authors: Zhen Li; Yueyue Tan; Wei Zhang; Bohejin Tang
      Pages: 2545 - 2551
      Abstract: Abstract Zr-metal organic frameworks (Zr-MOFs, UIO-66) as a kind of crystalline porous material possess controllable porous structure and strong thermal stability up to 753 K. In this paper, we synthesized Ni3(NO3)2(OH)4, Zr-MOF with high specific surface area (1073 m2 g−1) and Ni3(NO3)2(OH)4@Zr-MOF composite for pseudocapacitor material. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were taken to characterize the structure and morphology of Ni3(NO3)2(OH)4, Zr-MOF, and Ni3(NO3)2(OH)4@Zr-MOF. The porous structure of Zr-MOF favors the utilization of the active material Ni3(NO3)2(OH)4 and interfacial charge transport and provides short diffusion paths for ions, which results in a high specific capacitance. Electrochemical properties are evaluated by cyclic voltammetry (CV) and galvanostatic charge/discharge measurement. A maximum specific capacitance (SC) of 992 F/g was obtained from CV at a scan rate of 5 mVs−1, which is higher than Zr-MOF (∼134 F g−1) and Ni3(NO3)2(OH)4 (∼753 F g−1). Meanwhile, the Ni3(NO3)2(OH)4@Zr-MOF composite electrode exhibits a good cycling stability over 3000 cycles.
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1887-7
      Issue No: Vol. 22, No. 12 (2016)
  • Erratum to: On the sol–gel synthesis and characterization of
           (BaSr)(CeZr) O 3 -based fuel cell electrolytes
    • Authors: Shivendra Kumar Jaiswal; Sung Min Choi; Jongsup Hong; Kyung Joong Yoon; Ji-Won Son; Byung-Kook Kim; Hae-Weon Lee; Jong-Ho Lee
      Pages: 2553 - 2553
      PubDate: 2016-12-01
      DOI: 10.1007/s11581-016-1853-4
      Issue No: Vol. 22, No. 12 (2016)
  • The modification of anode material for direct borohydride fuel cell
    • Authors: Małgorzata Graś; Agnieszka Sierczyńska; Katarzyna Lota; Ilona Acznik; Grzegorz Lota
      Abstract: Abstract The direct borohydride fuel cell (DBFC) is a promising device that converts chemical energy into electricity by electrochemical reactions. This type of power source is technically more simple than traditional fuel cells, because it does not require any hydrogen container and noble metals. Hydrogen evolution during hydrolysis can be inhibited by modification of anode materials. Extensive studies are focused on various specific electrocatalysts and their impact on oxidation and hydrolysis of borohydride. The aim of the study is to determine the effect of anode material composition using borohydride as a fuel. In order to enhance the utilization of borohydride fuel, AB5-type alloy (LaMnNi3.55Al0.30Mn0.40Co0.75) was modified by adding Si or two kinds of carbon materials using the ball milling method. The most proper electrolyte was selected. The physical and electrochemical properties of anode materials were evaluated by scanning electron microscopy (SEM), cyclic voltammetry, chronopotentiometric measurements and electrochemical impedance spectroscopy. Studies showed that graphite was the best additive to anode material due to its density, compact structure and improvement of conductivity.
      PubDate: 2016-11-12
      DOI: 10.1007/s11581-016-1892-x
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