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https://www.readbyqxmd.com/read/29194945/generalized-synthesis-of-ultrathin-cobalt-based-nanosheets-from-metallophthalocyanine-modulated-self-assemblies-for-complementary-water-electrolysis
#1
Hao Wu, Zhimin Chen, Jialin Zhang, Feng Wu, Fei Xiao, Shichao Du, Chunying He, Yiqun Wu, Zhiyu Ren
The development of effective approaches for preparing large-area, self-standing, ultrathin metal-based nanosheets, which have proved to be favorable for catalytic applications such as water electrolysis, is highly desirable but remains a great challenge. Reported herein is a simple and versatile strategy to synthesize ultrathin Co3 O4 and CoP NSs consisting of close-packed nanoparticles by pyrolyzing cobalt(II) phthalocyanine/graphene oxide (CoPc/GO) assemblies in air and subsequent topotactic phosphidation while preserving the graphene-like morphology...
December 1, 2017: Small
https://www.readbyqxmd.com/read/29128713/non-enzymatic-electrochemical-detection-of-glucose-with-a-disposable-paper-based-sensor-using-a-cobalt-phthalocyanine-ionic-liquid-graphene-composite
#2
Sudkate Chaiyo, Eda Mehmeti, Weena Siangproh, Thai Long Hoang, Hai Phong Nguyen, Orawon Chailapakul, Kurt Kalcher
We introduce for the first time a paper-based analytical device (PAD) for the non-enzymatic detection of glucose by modifying a screen-printed carbon electrode with cobalt phthalocyanine, graphene and an ionic liquid (CoPc/G/IL/SPCE). The modifying composite was characterized by UV-visible spectroscopy, energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The disposable devices show excellent conductivity and fast electron transfer kinetics...
November 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29090111/electronic-structure-transport-and-collective-effects-in-molecular-layered-systems
#3
Torsten Hahn, Tim Ludwig, Carsten Timm, Jens Kortus
The great potential of organic heterostructures for organic device applications is exemplified by the targeted engineering of the electronic properties of phthalocyanine-based systems. The transport properties of two different phthalocyanine systems, a pure copper phthalocyanine (CoPc) and a flourinated copper phthalocyanine-manganese phthalocyanine (F16CoPc/MnPc) heterostructure, are investigated by means of density functional theory (DFT) and the non-equilibrium Green's function (NEGF) approach. Furthermore, a master-equation-based approach is used to include electronic correlations beyond the mean-field-type approximation of DFT...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28992894/chronic-prostatitis-and-comorbid-non-urological-overlapping-pain-conditions-a-co-twin-control-study
#4
Marianna Gasperi, John N Krieger, Christopher Forsberg, Jack Goldberg, Dedra Buchwald, Niloofar Afari
OBJECTIVES: Chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) is characterized by pain and voiding symptoms in the absence of an obvious infection or other cause. CP/CPPS frequently occurs with non-urological chronic overlapping pain conditions (COPCs) of unknown etiology. We conducted a co-twin control study in men discordant for chronic prostatitis (CP), an overarching diagnosis of which approximately 90% is CP/CPPS. The primary aim was to investigate the contribution of familial factors, including shared genetic and common environmental factors, to the comorbidity of CP and COPCs...
November 2017: Journal of Psychosomatic Research
https://www.readbyqxmd.com/read/28961400/relevance-of-the-interaction-between-the-m-phthalocyanines-and-carbon-nanotubes-in-the-electroactivity-toward-orr
#5
Carolina González-Gaitán, Ramiro Ruiz-Rosas, Emilia Morallón, Diego Cazorla-Amorós
In this work, the influence of the interaction between the iron and cobalt-phthalocyanines (FePc and CoPc) and carbon nanotubes (CNTs) used as support in the electroactivity toward oxygen reduction reaction (ORR) in alkaline media has been investigated. A series of thermal treatments were performed on these materials in order to modify the interaction between the CNTs and the phthalocyanines. The FePc-based catalysts showed the highest activity, with comparable performance to the state-of-the-art Pt-Vulcan catalyst...
October 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28853561/simultaneous-electrochemical-speciation-of-oxidized-and-reduced-glutathione-redox-profiling-of-oxidative-stress-in-biological-fluids-with-a-modified-carbon-electrode
#6
Patricia M Olmos Moya, Minerva Martínez Alfaro, Rezvan Kazemi, Mario A Alpuche-Avilés, Sophie Griveau, Fethi Bedioui, Silvia Gutiérrez Granados
The simultaneous electrochemical quantification of oxidized (GSSG) and reduced glutathione (GSH), biomarkers of oxidative stress, is demonstrated in biological fluids. The detection was accomplished by the development of a modified carbon electrode and was applied to the analysis of biological fluids of model organisms under oxidative stress caused by lead intoxication. Nanocomposite molecular material based on cobalt phthalocyanine (CoPc) and multiwalled carbon nanotubes functionalized with carboxyl groups (MWCNTf) was developed to modify glassy carbon electrodes (GCE) for the detection of reduced and oxidized glutathione...
October 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28773206/quantitative-immobilization-of-phthalocyanine-onto-bacterial-cellulose-for-construction-of-a-high-performance-catalytic-membrane-reactor
#7
Shiliang Chen, Qiaoling Teng
We report the fabrication of a tetra-amino cobalt (II) phthalocyanine (CoPc)-immobilized bacterial cellulose (BC) functional nanocomposite, CoPc@BC, by quantitative immobilization of CoPc onto a BC membrane. Lab-cultured BC was oxidized by NaIO₄ to generate aldehyde groups on BC for the subsequent CoPc immobilization, the processing conditions were optimized by monitoring both the generated aldehyde content and the resulting CoPc loading. X-ray photoelectron spectroscopy (XPS) was employed to characterize the change of the element bonding environment during the functionalization processes...
July 24, 2017: Materials
https://www.readbyqxmd.com/read/28764387/valence-electronic-structure-of-cobalt-phthalocyanine-from-an-optimally-tuned-range-separated-hybrid-functional
#8
Iulia Emilia Brumboiu, Georgia Prokopiou, Leeor Kronik, Barbara Brena
We analyse the valence electronic structure of cobalt phthalocyanine (CoPc) by means of optimally tuning a range-separated hybrid functional. The tuning is performed by modifying both the amount of short-range exact exchange (α) included in the hybrid functional and the range-separation parameter (γ), with two strategies employed for finding the optimal γ for each α. The influence of these two parameters on the structural, electronic, and magnetic properties of CoPc is thoroughly investigated. The electronic structure is found to be very sensitive to the amount and range in which the exact exchange is included...
July 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28649689/the-first-transition-metal-phthalocyanines-sensitizing-rubrene-emission-based-on-triplet-triplet-annihilation
#9
Jianlei Han, Fei Zhang, Jing You, Yonemura Hiroaki, Sunao Yamada, Toru Morifuji, Shirong Wang, Xianggao Li
Metallophthalocyanines (MPc-o-Cou, M = Fe, Co, Ni, and Cu) with fourth period metal ions have been successfully applied as a sensitizer coupled with rubrene (Rub) in photon upconversion based on triplet-triplet annihilation. An upconversion quantum yield (ϕPUC) of up to 4.82% was observed in the CoPc-o-Cou : Rub couple. The absorption and phosphorescence emission spectra showed that the Q bands and phosphorescence emission peaks were dramatically dependent on the number of d-electrons of the metal ions in MPc-o-Cou...
September 13, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28288216/rovibrational-spectroscopic-constants-of-the-interaction-between-ammonia-and-metallo-phthalocyanines-a-theoretical-protocol-for-ammonia-sensor-design
#10
Alan R Baggio, Daniel F S Machado, Valter H Carvalho-Silva, Leonardo G Paterno, Heibbe Cristhian B de Oliveira
In the present contribution, we develop an adapted theoretical approach based on DFT calculations (B3LYP functional) and solution of the nuclear Schrödinger equation by using the Discrete Variable Representation method to model the interaction of ammonia with metallo-phthalocyanines (MPcs, where M = Fe(2+), Co(2+), Ni(2+), Cu(2+) or Zn(2+)). This approach is intended to be a general protocol for the rational design of chemical sensors. The as-obtained binding energy curves, obtained from ab initio points, permitted us to calculate rovibrational energies and spectroscopic constants, as well as to establish the relative population of rovibrational states in different types of MPc-NH3 thermodynamic systems...
May 3, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28272403/highly-selective-and-active-co2-reduction-electrocatalysts-based-on-cobalt-phthalocyanine-carbon-nanotube-hybrid-structures
#11
Xing Zhang, Zishan Wu, Xiao Zhang, Liewu Li, Yanyan Li, Haomin Xu, Xiaoxiao Li, Xiaolu Yu, Zisheng Zhang, Yongye Liang, Hailiang Wang
Electrochemical reduction of carbon dioxide with renewable energy is a sustainable way of producing carbon-neutral fuels. However, developing active, selective and stable electrocatalysts is challenging and entails material structure design and tailoring across a range of length scales. Here we report a cobalt-phthalocyanine-based high-performance carbon dioxide reduction electrocatalyst material developed with a combined nanoscale and molecular approach. On the nanoscale, cobalt phthalocyanine (CoPc) molecules are uniformly anchored on carbon nanotubes to afford substantially increased current density, improved selectivity for carbon monoxide, and enhanced durability...
March 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28157314/molecular-chessboard-assemblies-sorted-by-site-specific-interactions-of-out-of-plane-d-orbitals-with-a-semimetal-template
#12
Aneliia Wäckerlin, Shadi Fatayer, Thomas Nijs, Sylwia Nowakowska, S Fatemeh Mousavi, Olha Popova, Aisha Ahsan, Thomas A Jung, Christian Wäckerlin
We show that highly ordered two-dimensional (2D) chessboard arrays consisting of a periodic arrangement of two different molecules can be obtained by self-assembly of unsubstituted metal-phthalocyanines (metal-Pcs) on a suitable substrate serving as the template. Specifically, CuPc + MnPc and CuPc + CoPc mixtures sort into highly ordered Cu/Mn and Cu/Co chessboard arrays on the square p(10 × 10) reconstruction of bismuth on Cu(100). Such created bimolecular chessboard assemblies emerge from the site-specific interactions between the central transition-metal ions and the periodically reconstructed substrate...
March 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/28155322/an-assessment-of-implementation-of-communityoriented-primary-care-in-kenyan-family-medicine-postgraduate-medical-education-programmes
#13
Ian J Nelligan, Jacob Shabani, Stephanie Taché, Gulnaz Mohamoud, Megan Mahoney
BACKGROUND AND OBJECTIVES: Family medicine postgraduate programmes in Kenya are examining the benefits of Community-Oriented Primary Care (COPC) curriculum, as a method to train residents in population-based approaches to health care delivery. Whilst COPC is an established part of family medicine training in the United States, little is known about its application in Kenya. We sought to conduct a qualitative study to explore the development and implementation of COPC curriculum in the first two family medicine postgraduate programmes in Kenya...
December 2, 2016: African Journal of Primary Health Care & Family Medicine
https://www.readbyqxmd.com/read/28076691/removal-of-copper-from-aqueous-solutions-by-rhizofiltration-using-genetically-modified-hairy-roots-expressing-a-bacterial-cu-binding-protein
#14
Patricia Pérez-Palacios, Elizabeth Agostini, Sabrina G Ibáñez, Melina A Talano, Ignacio D Rodríguez-Llorente, Miguel A Caviedes, Eloísa Pajuelo
The aim of this work was to develop a biotechnological tool to hyperaccumulate high copper (Cu) concentrations from wastewaters. Transgenic tobacco hairy roots were obtained by expressing, either the wild-type version of the gene copC from Pseudomonas fluorescens in the cytoplasm of plant cells (CuHR), or a modified version targeted to the vacuole (CuHR-V). Control hairy roots transformed with the empty vector (HR) were also generated. The roots were incubated in the presence of solutions containing Cu (from 1 to 50 mM)...
January 31, 2017: Environmental Technology
https://www.readbyqxmd.com/read/27902937/study-on-the-interaction-between-curcumin-and-copc-by-spectroscopic-and-docking-methods
#15
Zhen Song, Wen Yuan, Ruitao Zhu, Song Wang, Caifeng Zhang, Binsheng Yang
Curcumin is a widely studied polyphenolic compound which has a variety of biological activity as anti-inflammatory and antitumor drugs. Recent research reported that copper chaperone binding with small molecular may relate to the treatment of cancer. In this work, the interaction between curcumin and CopC has been investigated in detail by means of UV-vis absorption, FTIR, CD, fluorescence spectroscopic and molecular docking methods The results showed that the CopC conformation was altered by curcumin with reduction of β-sheet and increase of random coil...
March 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27813407/generation-of-transparent-oxygen-evolution-electrode-consisting-of-regularly-ordered-nanoparticles-from-self-assembly-cobalt-phthalocyanine-as-a-template
#16
Ahmed Ziani, Tatsuya Shinagawa, Liga Stegenburga, Kazuhiro Takanabe
The decoration of (photo)electrodes for efficient photoresponse requires the use of electrocatalysts with good dispersion and high transparency for efficient light absorption by the photoelectrode. As a result of the ease of thermal evaporation and particulate self-assembly growth, the phthalocyanine molecular species can be uniformly deposited layer-by-layer on the surface of substrates. This structure can be used as a template to achieve a tunable amount of catalysts, high dispersion of the nanoparticles, and transparency of the catalysts...
November 30, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27782491/kondo-screening-and-spin-excitation-in-few-layer-copc-molecular-assembly-stacking-on-pb-111-surface-a-dft-heom-study
#17
Yu Wang, Xiao Zheng, Jinlong Yang
Transition metal phthalocyanine molecules adsorbed on a metal substrate exhibit rich spin-related phenomena such as magnetic anisotropy, spin excitation, and Kondo effect. In this work, we investigate theoretically few-layer cobalt phthalocyanine (CoPc) molecular assembly stacking on Pb(111) surface with the use of a combined density functional theory (DFT) and hierarchical equations of motion (HEOM) approach. Calculation results indicate that the local spin properties of CoPc/Pb(111) composites depend critically on the number of adsorption layers...
October 21, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27747348/catalytic-aspects-of-metallophthalocyanines-adsorbed-on-gold-electrode-theoretical-exploration-of-the-binding-nature-role
#18
Sebastián Miranda-Rojas, Paulina Sierra-Rosales, Alvaro Muñoz-Castro, Ramiro Arratia-Pérez, José Heráclito Zagal, Fernando Mendizábal
The need of deeper insights regarding the inner working of catalysts represents a current challenge in the search of new ways to tune their activities towards new chemical transformations. Within this field, metallophthalocyanines-based (MPc) electrocatalysis has gained tremendous attention due to their versatility, low cost, great stability and excellent turn-over properties. In this concern, here we present a quantum chemical study of the formation of supramolecular complexes based on the adsorption of MPcs on gold substrates, and the effect of the substrate on their electrocatalytic properties...
October 17, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27711704/phthalocyanine-based-molecular-spintronic-devices
#19
C Barraud, K Bouzehouane, C Deranlot, D J Kim, R Rakshit, S Shi, J Arabski, M Bowen, E Beaurepaire, S Boukari, F Petroff, P Seneor, R Mattana
Molecular spintronics is an effervescent field of research, which aims at combining spin physics and molecular nano-objects. In this article, we show that phthalocyanine molecules integrated in magnetic tunnel junctions (MTJs) can lead to magnetoresistance effects of different origins. We have investigated cobalt and manganese phthalocyanine molecule based magnetic tunnel junctions. CoPc MTJs exhibit both tunneling magnetoresistance (TMR) and tunneling anisotropic magnetoresistance (TAMR) effects of similar magnitude...
October 4, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27586833/overlapping-chronic-pain-conditions-implications-for-diagnosis-and-classification
#20
REVIEW
William Maixner, Roger B Fillingim, David A Williams, Shad B Smith, Gary D Slade
UNLABELLED: There is increasing recognition that many if not most common chronic pain conditions are heterogeneous with a high degree of overlap or coprevalence of other common pain conditions along with influences from biopsychosocial factors. At present, very little attention is given to the high degree of overlap of many common pain conditions when recruiting for clinical trials. As such, many if not most patients enrolled into clinical studies are not representative of most chronic pain patients...
September 2016: Journal of Pain: Official Journal of the American Pain Society
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