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https://www.readbyqxmd.com/read/28927004/large-electrocaloric-effect-in-lead-free-ba0-85ca0-15-zr0-1ti0-9-o%C3%A2-ceramics-prepared-via-citrate-route
#1
Jing Shi, Rongfeng Zhu, Xing Liu, Bijun Fang, Ningyi Yuan, Jianning Ding, Haosu Luo
The 1 wt % Li-doped (Ba0.85Ca0.15)(Zr0.1Ti0.9)O₃ (BCZT-Li) ceramics prepared by the citrate method exhibit improved phase purity, densification and electrical properties, which provide prospective possibility to develop high-performance electrocaloric materials. The electrocaloric effect was evaluated by phenomenological method, and the BCZT-Li ceramics present large electrocaloric temperature change ∆T, especially large electrocaloric responsibility ξ = ∆Tmax/∆Emax, which can be comparable to the largest values reported in the lead-free piezoelectric ceramics...
September 18, 2017: Materials
https://www.readbyqxmd.com/read/28927003/expanding-the-applicability-of-poly-ionic-liquids-in-solid-phase-microextraction-pyrrolidinium-coatings
#2
David J S Patinha, Liliana C Tomé, Mehmet Isik, David Mecerreyes, Armando J D Silvestre, Isabel M Marrucho
Crosslinked pyrrolidinium-based poly(ionic liquids) (Pyrr-PILs) were synthesized through a fast, simple, and solventless photopolymerization scheme, and tested as solid phase microextraction (SPME) sorbents. A series of Pyrr-PILs bearing three different alkyl side chain lengths with two, eight, and fourteen carbons was prepared, characterized, and homogeneously coated on a steel wire by using a very simple procedure. The resulting coatings showed a high thermal stability, with decomposition temperatures above 350 °C, excellent film stability, and lifetime of over 100 injections...
September 18, 2017: Materials
https://www.readbyqxmd.com/read/28926984/n-doped-carbon-xerogels-as-pt-support-for-the-electro-reduction-of-oxygen
#3
Cinthia Alegre, David Sebastián, María E Gálvez, Estela Baquedano, Rafael Moliner, Antonino S Aricò, Vincenzo Baglio, María J Lázaro
Durability and limited catalytic activity are key impediments to the commercialization of polymer electrolyte fuel cells. Carbon materials employed as catalyst support can be doped with different heteroatoms, like nitrogen, to improve both catalytic activity and durability. Carbon xerogels are nanoporous carbons that can be easily synthesized in order to obtain N-doped materials. In the present work, we introduced melamine as a carbon xerogel precursor together with resorcinol for an effective in-situ N doping (3-4 wt % N)...
September 17, 2017: Materials
https://www.readbyqxmd.com/read/28926785/a-new-v-doped-bi2-o-s-3-oxysulfide-catalyst-for-highly-efficient-catalytic-reduction-of-2-nitroaniline-and-organic-dyes
#4
Angaw Kelemework Abay, Dong-Hau Kuo, Xiaoyun Chen, Albert Daniel Saragih
A new type of convenient, and environmentally friendly, Vanadium (V)-doped Bi2(O,S)3 oxysulfide catalyst with different V contents was successfully synthesized via a simple and facile method. The obtained V-doped Bi2(O,S)3 solid solution catalysts were fully characterized by conventional methods. The catalytic performance of the samples was tested by using the reduction of 2-nitroaniline (2-NA) in aqueous solution. The reduction/decolorization of methylene blue (MB) and rhodamine B (RhB) was also chosen to evaluate the universality of catalysts...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28926732/multifunctional-mesoporous-zro2-encapsulated-upconversion-nanoparticles-for-mild-nir-light-activated-synergistic-cancer-therapy
#5
Lili Feng, Shili Gai, Fei He, Yunlu Dai, Chongna Zhong, Piaoping Yang, Jun Lin
Desirable nanosystem that could not only deliver drugs safely and effectively into tumor sites, but also be expected to serve as photosensitizer to realize the photodynamic therapeutic function, would be of great significance in the synergistic cancer therapy. To perform this task, a multifunctional nanosystem has been developed for markedly enhanced cancer therapeutic efficacy by loading chemotherapy agent (doxorubicin hydrochloride, DOX) and photosensitive drug chlorin e6 (Ce6) into the channels of mesoporous zirconium dioxide (ZrO2) layer which coats on Nd(3+)-doped upconversion nanoparticles (UCNPs)...
September 13, 2017: Biomaterials
https://www.readbyqxmd.com/read/28926695/architecting-mesoporous-n-doped-graphitic-carbon-framework-encapsulating-cote2-as-efficient-oxygen-evolution-electrocatalyst
#6
Ming Liu, Xiaoqing Lu, Chen Guo, Zhaojie Wang, Yanpeng Li, Yan Lin, Yan Zhou, Shutao Wang, Jun Zhang
To improve the efficiency of cobalt-based catalysts for water electrolysis, tremendous efforts have been dedicated to tuning the composition, morphology, size and structure of the materials. We report here the facile preparation of orthorhombic CoTe2 nanocrystals embedded in N-doped graphitic carbon matrix to form a 3D architecture with a size of ~500 nm and abundant mesopores of ~4 nm for the oxygen evolution reaction. The hybrid electrocatalyst delivers a small overpotential of 300 mV at 10 mA cm-2, which is much lower than that for pristine CoTe2 powder...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28926276/polypyrrole-coated-perfluorocarbon-nanoemulsions-as-a-sono-photoacoustic-contrast-agent
#7
David Shicheng Li, Soon Joon Yoon, Ivan Pelivanov, M Frenz, Matthew O'Donnell, Lilo D Pozzo
A new contrast agent for combined photoacoustic and ultrasound imaging is presented. It has a liquid perfluorocarbon (PFC) core of about 250 nm diameter coated by a 30 nm thin polypyrrole (PPy) doped polymer shell emulsion which represents a broadband absorber covering the visible and near-infrared ranges (peak optical extinction at 1050 nm). When exposed to a sufficiently high intensity optical or acoustic pulse, the droplets vaporize to form microbubbles providing a strong increase in imaging sensitivity and specificity...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28926226/correlation-between-dissolved-protons-in-nickel-doped-bazr0-1ce0-7y0-1yb0-1o3-%C3%AE-and-its-electrical-conductive-properties
#8
Tomohiro Ishiyama, Haruo Kishimoto, Katherine Develos-Bagarinao, Katsuhiko Yamaji, Toshiaki Yamaguchi, Yoshinobu Fujishiro
The electrical conductivity of nickel (2 wt %)-doped BaZr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb) acceptor-doped perovskite oxide was evaluated under air and a 1% H2 atmosphere. The partial conductivity was calculated from the total conductivity and the transport number of each carrier (tH(+), tO(2-), and th(+)) obtained using the concentration cell method. Its correlation with the dissolution state of the protons in the oxide as studied by in situ diffuse reflection Fourier transform infrared spectroscopy is discussed...
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28926182/water-dynamics-and-proton-transport-mechanisms-of-nafion%C3%A2-117-phosphotungstic-acid-composite-membrane-a-molecular-dynamics-study
#9
Saeed Akbari, Mohammad Taghi Hamed Mosavian, Ali Ahmadpour, Fatemeh Moosavi
Nafion®/phosphotungstic acid composite membrane and impact of varying concentration of heteropoly acid (HPA) on the well-known effective mechanisms of proton transport were investigated using classical and quantum hopping molecular dynamics simulation. Our simulations demonstrated that the HPA particles exhibited a favorable influence on Grotthuss mechanism in proton transportation at low hydration levels. From radial distribution function examinations, it was found that HPA particles were solvated with water and also exhibited stronger affinity toward hydronium ions...
September 19, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28926060/mg-doped-li2fesio4-c-nanocomposites-synthesized-by-the-solvothermal-method-for-lithium-ion-batteries
#10
Ajay Kumar, O D Jayakumar, Jagannath, Parisa Bashiri, G A Nazri, Vaman M Naik, Ratna Naik
A series of porous Li2Fe1-xMgxSiO4/C (x = 0, 0.01, 0.02, 0.04) nanocomposites (LFS/C, 1Mg-LFS/C, 2Mg-LFS and 4Mg-LFS/C) have been synthesized via a solvo-thermal method using the Pluronic P123 polymer as an in situ carbon source. Rietveld refinement of the X-ray diffraction data of Li2Fe1-xMgxSiO4/C composites confirms the formation of the monoclinic P21 structure of Li2FeSiO4. The addition of Mg facilitates the growth of impurity-free Li2FeSiO4 with increased crystallinity and particle size. Despite having the same percentage of carbon content (∼15 wt%) in all the samples, the 1Mg-LFS/C nanocomposite delivered the highest initial discharge capacity of 278 mA h g(-1) (∼84% of the theoretical capacity) at the C/30 rate and also exhibited the best rate capability and cycle stability (94% retention after 100 charge-discharge cycles at 1C)...
September 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28926043/new-complete-assignment-of-x-ray-powder-diffraction-patterns-in-graphitic-carbon-nitride-using-discrete-fourier-transform-and-direct-experimental-evidence
#11
Bo-Wen Sun, Hong-Yu Yu, Yong-Jing Yang, Hui-Jun Li, Cheng-Yu Zhai, Dong-Jin Qian, Meng Chen
To date, there have been only a few studies focusing on the assignment of X-ray diffraction (XRD) patterns in graphitic carbon nitrides (g-C3N4) and contradictory determination for a broad peak around 12°-14° has been perplexing. In this study, assignments are carried out both theoretically and experimentally. The cell parameters for g-C3N4 are determined as a = b = 8.1 Å, c = 6.5 Å, α = β = 90°, and γ = 120°. Qualitative and semi-quantitative methods such as fast Fourier transform and residual after 1st and 2nd derivatives are used to confirm and search the hidden peaks...
September 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28925946/development-and-biocompatibility-evaluation-of-photocatalytic-tio%C3%A2-reduced-graphene-oxide-based-nanoparticles-designed-for-self-cleaning-purposes
#12
Ionela Cristina Nica, Miruna S Stan, Marcela Popa, Mariana Carmen Chifiriuc, Gratiela G Pircalabioru, Veronica Lazar, Iuliana Dumitrescu, Lucian Diamandescu, Marcel Feder, Mihaela Baibarac, Marin Cernea, Valentin Adrian Maraloiu, Traian Popescu, Anca Dinischiotu
Graphene is widely used in nanotechnologies to amplify the photocatalytic activity of TiO₂, but the development of TiO₂/graphene composites imposes the assessment of their risk to human and environmental health. Therefore, reduced graphene oxide was decorated with two types of TiO₂ particles co-doped with 1% iron and nitrogen, one of them being obtained by a simultaneous precipitation of Ti(3+) and Fe(3+) ions to achieve their uniform distribution, and the other one after a sequential precipitation of these two cations for a higher concentration of iron on the surface...
September 19, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28925713/simple-and-efficient-fabrication-of-mayenite-electrides-from-a-solution-derived-precursor
#13
Dong Jiang, Zeyu Zhao, Shenglong Mu, Vincent Phaneuf, Jianhua Tong
Mayenite (12CaO·7Al2O3, C12A7) electride with an anti-zeolite nanoporous structure has attracted intense attention due to its versatile promising application potentials. However, the synthesis difficulty because of extremely harsh conditions (e.g., reduction in sealed calcium or titanium vapor) significantly obstructs its realistic applications. In this work, we employed a simple, efficient, and cost-effective route for synthesizing mayenite electrides (C12A7:e(-)) in both powder and dense ceramic. C12A7:e(-) powders with efficient electron doping (3...
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28925707/heterovalent-doping-in-colloidal-semiconductor-nanocrystals-cation-exchange-enabled-new-accesses-to-tuning-dopant-luminescence-and-electronic-impurities
#14
Jiatao Zhang, Qiumei Di, Jia Liu, Bing Bai, Jian Liu, Meng Xu, Jiajia Liu
Heterovalent doping in colloidal semiconductor nanocrystals (CSNCs), with provisions of extra electrons (n-type doping) or extra holes (p-type doping), could enhance their performance of optical and electronical properties. In view of the challenges imposed by the intrinsic self-purification, self-quenching, and self-compensation effects of CSNCs, we outline the progresses on heterovalent doping in CSNCs, with particular focus on the cation exchange-enabled tuning of dopant luminescence and electronic impurities...
September 19, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28925684/carbon-nanotube-based-ion-selective-sensors-for-wearable-applications
#15
Soumyendu Roy, Moshe David-Pur, Yael Hanein
Wearable electronics offer new opportunities in a wide range of applications, especially sweat analysis using skin sensors. A fundamental challenge in these applications is the formation of sensitive and stable electrodes. In this article we report the development of a wearable sensor based on carbon nanotube (CNT) electrode arrays for sweat sensing. Solid-state ion selective electrodes (ISEs), sensitive to Na+ ions, were prepared by drop coating plasticized poly-vinyl chloride (PVC) doped with ionophore and ion exchanger on CNT electrodes...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28925531/theoretical-evidences-behind-bifunctional-catalytic-activity-in-pristine-and-functionalized-al2c-monolayer
#16
Rosely Almeida, Amitava Banerjee, Sudip Chakraborty, Jailton Almeida, Rajeev Ahuja
First principles electronic structure calculations based on density functional theory (DFT) framework are performed to investigate hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) on two-dimensional Al2C monolayer. The monolayer is functionalized with several dopants and four prominent doping elements are nitrogen (N), phosphorous (P), boron (B) and sulphur (S). After determining the individual adsorption energy of hydrogen and oxygen on different functionalized Al2C monolayer, the adsorption free energies are predicted subsequently for each of the functionalized cases in order to predict which case of functionalization serves better for HER or OER...
September 19, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28924341/intraocular-pressure-spikes-following-neodymium-doped-yttrium-aluminum-garnet-laser-capsulotomy-current-prevalence-and-management-in-israel
#17
Asaf Achiron
AIM: The current treatment for posterior capsular opacification (PCO), neodymium-doped yttrium aluminum garnet (Nd:YAG) laser capsulotomy, may lead to increased intraocular pressure (IOP). Our aim was to survey routines in the management of IOP spikes and to identify the rate of IOP spikes following prophylactic apraclonidine treatment. MATERIALS AND METHODS: A survey questionnaire among ophthalmologists and a retrospective registry review was used. Patients were administered apraclonidine 0...
May 2017: Journal of Current Glaucoma Practice
https://www.readbyqxmd.com/read/28924327/direct-comparison-of-time-resolved-terahertz-spectroscopy-and-hall-van-der-pauw-methods-for-measurement-of-carrier-conductivity-and-mobility-in-bulk-semiconductors
#18
Brian G Alberding, W Robert Thurber, Edwin J Heilweil
Charge carrier conductivity and mobility for various semiconductor wafers and crystals were measured by ultrafast above bandgap, optically excited Time-Resolved Terahertz Spectroscopy (TRTS) and Hall Van der Pauw contact methods to directly compare these approaches and validate the use of the non-contact optical approach for future materials and in-situ device analyses. Undoped and doped silicon (Si) wafers with resistances varying over six orders of magnitude were selected as model systems since contact Hall measurements are reliably made on this material...
July 2017: Journal of the Optical Society of America. B, Optical Physics
https://www.readbyqxmd.com/read/28924301/epitaxial-graphene-homogeneity-and-quantum-hall-effect-in-millimeter-scale-devices
#19
Yanfei Yang, Guangjun Cheng, Patrick Mende, Irene G Calizo, Randall M Feenstra, Chiashain Chuang, Chieh-Wen Liu, Chieh-I Liu, George R Jones, Angela R Hight Walker, Randolph E Elmquist
Quantized magnetotransport is observed in 5.6 × 5.6 mm(2) epitaxial graphene devices, grown using highly constrained sublimation on the Si-face of SiC(0001) at high temperature (1900 °C). The precise quantized Hall resistance of [Formula: see text] is maintained up to record level of critical current Ixx = 0.72 mA at T = 3.1 K and 9 T in a device where Raman microscopy reveals low and homogeneous strain. Adsorption-induced molecular doping in a second device reduced the carrier concentration close to the Dirac point (n ≈ 10(10) cm(-2)), where mobility of 18760 cm(2)/V is measured over an area of 10 mm(2)...
May 2017: Carbon
https://www.readbyqxmd.com/read/28924234/ultrasensitive-all-2d-mos2-phototransistors-enabled-by-an-out-of-plane-mos2-pn-homojunction
#20
Nengjie Huo, Gerasimos Konstantatos
Two-dimensional transition metal dichalcogenide-based photodetectors have demonstrated potential for the next generation of 2-dimensional optoelectronics. However, to date, their sensitivity has not been superior to that of other technologies. Here we report an ultrasensitive two-dimensional photodetector employing an in-plane phototransistor with an out-of-plane vertical MoS2 p-n junction as a sensitizing scheme. The vertical built-in field is introduced for the first time in the transport channel of MoS2 phototransistors by facile chemical surface doping, which separates the photo-excited carriers efficiently and produces a photoconductive gain of >10(5) electrons per photon, external quantum efficiency greater than 10%, responsivity of 7 × 10(4) A W(-1), and a time response on the order of tens of ms...
September 18, 2017: Nature Communications
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