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Kochergin YS, Schwarz D, Acharjya A, Ichangi A, Kulkarni R, Eliášová P, Vacek J, Schmidt J, Thomas A, Bojdys MJ. Exploring the “Goldilocks Zone” of Semiconducting Polymer Photocatalysts by Donor-Acceptor Interactions. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201809702] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yaroslav S. Kochergin
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
- Department of Organic Chemistry; Charles University in Prague; Hlavova 8 128 00 Prague Czech Republic
| | - Dana Schwarz
- Department of Organic Chemistry; Charles University in Prague; Hlavova 8 128 00 Prague Czech Republic
| | - Amitava Acharjya
- Institute of Chemistry; Technische Universität Berlin; Hardenbergstraße 40 10623 Berlin Germany
| | - Arun Ichangi
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
| | - Ranjit Kulkarni
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Pavla Eliášová
- Department of Physical and Macromolecular Chemistry; Charles University in Prague; Hlavova 8 128 00 Prague Czech Republic
| | - Jaroslav Vacek
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
| | - Johannes Schmidt
- Institute of Chemistry; Technische Universität Berlin; Hardenbergstraße 40 10623 Berlin Germany
| | - Arne Thomas
- Institute of Chemistry; Technische Universität Berlin; Hardenbergstraße 40 10623 Berlin Germany
| | - Michael J. Bojdys
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
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Kochergin YS, Schwarz D, Acharjya A, Ichangi A, Kulkarni R, Eliášová P, Vacek J, Schmidt J, Thomas A, Bojdys MJ. Exploring the “Goldilocks Zone” of Semiconducting Polymer Photocatalysts by Donor-Acceptor Interactions. Angew Chem Int Ed Engl 2018; 57:14188-14192. [DOI: 10.1002/anie.201809702] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Indexed: 02/06/2023]
Affiliation(s)
- Yaroslav S. Kochergin
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
- Department of Organic Chemistry; Charles University in Prague; Hlavova 8 128 00 Prague Czech Republic
| | - Dana Schwarz
- Department of Organic Chemistry; Charles University in Prague; Hlavova 8 128 00 Prague Czech Republic
| | - Amitava Acharjya
- Institute of Chemistry; Technische Universität Berlin; Hardenbergstraße 40 10623 Berlin Germany
| | - Arun Ichangi
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
| | - Ranjit Kulkarni
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Pavla Eliášová
- Department of Physical and Macromolecular Chemistry; Charles University in Prague; Hlavova 8 128 00 Prague Czech Republic
| | - Jaroslav Vacek
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
| | - Johannes Schmidt
- Institute of Chemistry; Technische Universität Berlin; Hardenbergstraße 40 10623 Berlin Germany
| | - Arne Thomas
- Institute of Chemistry; Technische Universität Berlin; Hardenbergstraße 40 10623 Berlin Germany
| | - Michael J. Bojdys
- Institute of Organic Chemistry and Biochemistry of the CAS; Flemingovo nám. 2 166 10 Prague Czech Republic
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
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Schwarz D, Kochergin YS, Acharjya A, Ichangi A, Opanasenko MV, Čejka J, Lappan U, Arki P, He J, Schmidt J, Nachtigall P, Thomas A, Tarábek J, Bojdys MJ. Tailored Band Gaps in Sulfur- and Nitrogen-Containing Porous Donor-Acceptor Polymers. Chemistry 2017; 23:13023-13027. [PMID: 28727178 DOI: 10.1002/chem.201703332] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Indexed: 11/07/2022]
Abstract
Donor-acceptor dyads hold the key to tuning of electrochemical properties and enhanced mobility of charge carriers, yet their incorporation into a heterogeneous polymer network proves difficulty owing to the fundamentally different chemistry of the donor and acceptor subunits. A family of sulfur- and nitrogen-containing porous polymers (SNPs) are obtained via Sonogashira-Hagihara cross-coupling and combine electron-withdrawing triazine (C3 N3 ) and electron-donating, sulfur-containing linkers. Choice of building blocks and synthetic conditions determines the optical band gap (from 1.67 to 2.58 eV) and nanoscale ordering of these microporous materials with BET surface areas of up to 545 m2 g-1 and CO2 capacities up to 1.56 mmol g-1 . Our results highlight the advantages of the modular design of SNPs, and one of the highest photocatalytic hydrogen evolution rates for a cross-linked polymer without Pt co-catalyst is attained (194 μmol h-1 g-1 ).
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Affiliation(s)
- Dana Schwarz
- Department of Organic Chemistry, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Yaroslav S Kochergin
- Department of Organic Chemistry, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Amitava Acharjya
- Department of Functional Materials, Technical University Berlin, Hardenbergstr. 40, 10623, Berlin, Germany
| | - Arun Ichangi
- Department of Organic Chemistry, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic.,Institute of Organic Chemistry and Biochemistry of the CAS, Flemingovo nam. 2, 166 10, Prague 6, Czech Republic
| | - Maksym V Opanasenko
- Heyrovsky Institute for Physical Chemistry, Academy of Science Czech Republic, Dolejškova 3, 182 23, Prague 8, Czech Republic
| | - Jiří Čejka
- Heyrovsky Institute for Physical Chemistry, Academy of Science Czech Republic, Dolejškova 3, 182 23, Prague 8, Czech Republic
| | - Uwe Lappan
- Leibniz-Institut fuer Polymerforschung Dresden e.V., Hohe Str. 6, 01069, Dresden, Germany
| | - Pal Arki
- Technical University Bergakademie Freiberg, Gustav Zeuner Str. 3, 09599, Freiberg, Germany
| | - Junjie He
- Department of Physical and Macromolecular Chemistry, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Johannes Schmidt
- Department of Functional Materials, Technical University Berlin, Hardenbergstr. 40, 10623, Berlin, Germany
| | - Petr Nachtigall
- Department of Physical and Macromolecular Chemistry, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Arne Thomas
- Department of Functional Materials, Technical University Berlin, Hardenbergstr. 40, 10623, Berlin, Germany
| | - Ján Tarábek
- Institute of Organic Chemistry and Biochemistry of the CAS, Flemingovo nam. 2, 166 10, Prague 6, Czech Republic
| | - Michael J Bojdys
- Department of Organic Chemistry, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic.,Institute of Organic Chemistry and Biochemistry of the CAS, Flemingovo nam. 2, 166 10, Prague 6, Czech Republic
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Lei Y, Liao Y, Long JH, Cai H, Bai Y, Liu J. Observation of electron beam moiré fringes in an image conversion tube. Ultramicroscopy 2016; 170:19-23. [PMID: 27522476 DOI: 10.1016/j.ultramic.2016.07.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 07/06/2016] [Accepted: 07/22/2016] [Indexed: 10/21/2022]
Abstract
An image conversion tube with a magnetic lens was designed to observe electron beam moiré fringes. Electron beam moiré fringes result from the interference between the photocathode and the anode meshes. The photocathode had a strip line structure with a spatial frequency of 10L/mm. The anode mesh had a fixed spatial frequency of 10L/mm, and could be rotated around the axis of the image tube. The changes to the fringe direction and the spacing as a function of the rotation angle between the photocathode and the anode mesh were examined. The experimental results agreed with the theoretical analysis. Moiré fringes with a modulation of ~20% were obtained using a 3keV electron beam.
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Affiliation(s)
- Yunfei Lei
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen University, Shenzhen 518060, China
| | - Yubo Liao
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen University, Shenzhen 518060, China
| | - Jing-Hua Long
- College of Physics Science and Technology, Shenzhen University, Shenzhen 518060, China
| | - Houzhi Cai
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen University, Shenzhen 518060, China
| | - Yanli Bai
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen University, Shenzhen 518060, China
| | - Jinyuan Liu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, Shenzhen University, Shenzhen 518060, China.
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Lartigue L, Hugounenq P, Alloyeau D, Clarke SP, Lévy M, Bacri JC, Bazzi R, Brougham DF, Wilhelm C, Gazeau F. Cooperative organization in iron oxide multi-core nanoparticles potentiates their efficiency as heating mediators and MRI contrast agents. ACS NANO 2012; 6:10935-49. [PMID: 23167525 DOI: 10.1021/nn304477s] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In the pursuit of optimized magnetic nanostructures for diagnostic and therapeutic applications, the role of nanoparticle architecture has been poorly investigated. In this study, we demonstrate that the internal collective organization of multi-core iron oxide nanoparticles can modulate their magnetic properties in such a way as to critically enhance their hyperthermic efficiency and their MRI T(1) and T(2) contrast effect. Multi-core nanoparticles composed of maghemite cores were synthesized through a polyol approach, and subsequent electrostatic colloidal sorting was used to fractionate the suspensions by size and hence magnetic properties. We obtained stable suspensions of citrate-stabilized nanostructures ranging from single-core 10 nm nanoparticles to multi-core magnetically cooperative 30 nm nanoparticles. Three-dimensional oriented attachment of primary cores results in enhanced magnetic susceptibility and decreased surface disorder compared to individual cores, while preserving a superparamagnetic-like behavior of the multi-core structures and potentiating thermal losses. Exchange coupling in the multi-core nanoparticles modifies the dynamics of the magnetic moment in such a way that both the longitudinal and transverse NMR relaxivities are also enhanced. Long-term MRI detection of tumor cells and their efficient destruction by magnetic hyperthermia can be achieved thanks to a facile and nontoxic cell uptake of these iron oxide nanostructures. This study proves for the first time that cooperative magnetic behavior within highly crystalline iron oxide superparamagnetic multi-core nanoparticles can improve simultaneously therapeutic and diagnosis effectiveness over existing nanostructures, while preserving biocompatibility.
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Affiliation(s)
- Lénaic Lartigue
- Laboratoire Matières et Systèmes Complexes, UMR 7057 CNRS/ Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France
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Langlois C, Li ZL, Yuan J, Alloyeau D, Nelayah J, Bochicchio D, Ferrando R, Ricolleau C. Transition from core-shell to Janus chemical configuration for bimetallic nanoparticles. NANOSCALE 2012; 4:3381-8. [PMID: 22544336 DOI: 10.1039/c2nr11954d] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In order to determine the possibilities to control the chemical configuration of bimetallic nanoparticles, we have considered CuAg nanoparticles synthesized by a physical route as a model in this study. The synthesis was made by pulsed laser deposition under ultra-high vacuum conditions, via a sequential deposition procedure. We show that the temperature of the substrate and the absolute quantity of Ag in a particle are the main parameters that drive the chemical configuration. To explain the transition from a core-shell configuration to a Janus configuration as a function of Ag quantity, we have conducted density-functional theory calculations and atomistic molecular dynamics simulations to investigate the stability of this system. The results are presented together with the experimental observations.
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Affiliation(s)
- Cyril Langlois
- Laboratoire Matériaux et Phénomènes Quantiques, CNRS-UMR 7162, Université Paris Diderot - Paris 7, Case Courrier 7021, 75205 Paris Cedex 13, France.
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Sekot G, Posch G, Oh YJ, Zayni S, Mayer HF, Pum D, Messner P, Hinterdorfer P, Schäffer C. Analysis of the cell surface layer ultrastructure of the oral pathogen Tannerella forsythia. Arch Microbiol 2012; 194:525-39. [PMID: 22273979 PMCID: PMC3354324 DOI: 10.1007/s00203-012-0792-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 12/02/2011] [Accepted: 01/10/2012] [Indexed: 11/26/2022]
Abstract
The Gram-negative oral pathogen Tannerella forsythia is decorated with a 2D crystalline surface (S-) layer, with two different S-layer glycoprotein species being present. Prompted by the predicted virulence potential of the S-layer, this study focused on the analysis of the arrangement of the individual S-layer glycoproteins by a combination of microscopic, genetic, and biochemical analyses. The two S-layer genes are transcribed into mRNA and expressed into protein in equal amounts. The S-layer was investigated on intact bacterial cells by transmission electron microscopy, by immune fluorescence microscopy, and by atomic force microscopy. The analyses of wild-type cells revealed a distinct square S-layer lattice with an overall lattice constant of 10.1 ± 0.7 nm. In contrast, a blurred lattice with a lattice constant of 9.0 nm was found on S-layer single-mutant cells. This together with in vitro self-assembly studies using purified (glyco)protein species indicated their increased structural flexibility after self-assembly and/or impaired self-assembly capability. In conjunction with TEM analyses of thin-sectioned cells, this study demonstrates the unusual case that two S-layer glycoproteins are co-assembled into a single S-layer. Additionally, flagella and pilus-like structures were observed on T. forsythia cells, which might impact the pathogenicity of this bacterium.
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Affiliation(s)
- Gerhard Sekot
- Department of NanoBiotechnology, Vienna Institute of BioTechnology, Universität für Bodenkultur Wien, Muthgasse 11, 1190 Wien, Austria
| | - Gerald Posch
- Department of NanoBiotechnology, Vienna Institute of BioTechnology, Universität für Bodenkultur Wien, Muthgasse 11, 1190 Wien, Austria
| | - Yoo Jin Oh
- Christian Doppler Laboratory of Nanoscopic Methods in Biophysics, Institute for Biophysics, Johannes Kepler University, Altenbergerstrasse 69, 4070 Linz, Austria
| | - Sonja Zayni
- Department of NanoBiotechnology, Vienna Institute of BioTechnology, Universität für Bodenkultur Wien, Muthgasse 11, 1190 Wien, Austria
| | - Harald F. Mayer
- Department of NanoBiotechnology, Vienna Institute of BioTechnology, Universität für Bodenkultur Wien, Muthgasse 11, 1190 Wien, Austria
| | - Dietmar Pum
- Department of NanoBiotechnology, Vienna Institute of BioTechnology, Universität für Bodenkultur Wien, Muthgasse 11, 1190 Wien, Austria
| | - Paul Messner
- Department of NanoBiotechnology, Vienna Institute of BioTechnology, Universität für Bodenkultur Wien, Muthgasse 11, 1190 Wien, Austria
| | - Peter Hinterdorfer
- Christian Doppler Laboratory of Nanoscopic Methods in Biophysics, Institute for Biophysics, Johannes Kepler University, Altenbergerstrasse 69, 4070 Linz, Austria
| | - Christina Schäffer
- Department of NanoBiotechnology, Vienna Institute of BioTechnology, Universität für Bodenkultur Wien, Muthgasse 11, 1190 Wien, Austria
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Morozov YG, Belousova OV, Kuznetsov MV, Ortega D, Parkin IP. Electric field-assisted levitation-jet aerosol synthesis of Ni/NiO nanoparticles. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31233f] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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