@misc{BaldKeller2014,
  author    = {Bald, Ilko and Keller, Adrian},
  title     = {Molecular processes studied at a single-molecule level using DNA origami nanostructures and atomic force microscopy},
  series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  number    = {9},
  issn      = {1866-8372},
  doi       = {10.25932/publishup-47584},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-475843},
  pages     = {13803 -- 13823},
  year      = {2014},
  abstract  = {DNA origami nanostructures allow for the arrangement of different functionalities such as proteins, specific DNA structures, nanoparticles, and various chemical modifications with unprecedented precision. The arranged functional entities can be visualized by atomic force microscopy (AFM) which enables the study of molecular processes at a single-molecular level. Examples comprise the investigation of chemical reactions, electron-induced bond breaking, enzymatic binding and cleavage events, and conformational transitions in DNA. In this paper, we provide an overview of the advances achieved in the field of single-molecule investigations by applying atomic force microscopy to functionalized DNA origami substrates.},
  language  = {en}
}
@misc{ViouxTaubert2014,
  author    = {Vioux, Andr{\´e} and Taubert, Andreas},
  title     = {Ionic liquids 2014 and selected papers from ILMAT 2013},
  series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  number    = {1055},
  issn      = {1866-8372},
  doi       = {10.25932/publishup-47506},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-475062},
  pages     = {6},
  year      = {2014},
  language  = {en}
}
@misc{Laschewsky2014,
  author    = {Laschewsky, Andr{\´e}},
  title     = {Structures and synthesis of zwitterionic polymers},
  series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  number    = {1043},
  issn      = {1866-8372},
  doi       = {10.25932/publishup-47616},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-476167},
  pages     = {60},
  year      = {2014},
  abstract  = {The structures and synthesis of polyzwitterions ("polybetaines") are reviewed, emphasizing the literature of the past decade. Particular attention is given to the general challenges faced, and to successful strategies to obtain polymers with a true balance of permanent cationic and anionic groups, thus resulting in an overall zero charge. Also, the progress due to applying new methodologies from general polymer synthesis, such as controlled polymerization methods or the use of "click" chemical reactions is presented. Furthermore, the emerging topic of responsive ("smart") polyzwitterions is addressed. The considerations and critical discussions are illustrated by typical examples.},
  language  = {en}
}
@misc{MorgnerLecointreCharbonniereetal.2014,
  author    = {Morgner, Frank and Lecointre, Alexandre and Charbonni{\`e}re, Loic J. and L{\"o}hmannsr{\"o}ben, Hans-Gerd},
  title     = {Detecting free hemoglobin in blood plasma and serum with luminescent terbium complexes},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-99485},
  pages     = {6},
  year      = {2014},
  abstract  = {Hemolysis, the rupturing of red blood cells, can result from numerous medical conditions (in vivo) or occur after collecting blood specimen or extracting plasma and serum out of whole blood (in vitro). In clinical laboratory practice, hemolysis can be a serious problem due to its potential to bias detection of various analytes or biomarkers. Here we present the first ''mix-and-measure'' method to assess the degree of hemolysis in biosamples using luminescence spectroscopy. Luminescent terbium complexes (LTC) were studied in the presence of free hemoglobin (Hb) as indicators for hemolysis in TRIS-buffer, and in fresh human plasma with absorption, excitation and emission measurements. Our findings indicate dynamic as well as resonance energy transfer (FRET) between the LTC and the porphyrin ligand of hemoglobin. This transfer leads to a decrease in luminescence intensity and decay time even at nanomolar hemoglobin concentrations either in buffer or plasma. Luminescent terbium complexes are very sensitive to free hemoglobin in buffer and blood plasma. Due to the instant change in luminescence properties of the LTC in presence of Hb it is possible to access the concentration of hemoglobin via spectroscopic methods without incubation time or further treatment of the sample thus enabling a rapid and sensitive detection of hemolysis in clinical diagnostics.},
  language  = {en}
}
@misc{CommingesFrascaSuetterlinetal.2014,
  author    = {Comminges, Cl{\´e}ment and Frasca, Stefano and S{\"u}tterlin, Martin and Wischerhoff, Erik and Laschewsky, Andr{\´e} and Wollenberger, Ursula},
  title     = {Surface modification with thermoresponsive polymer brushes for a switchable electrochemical sensor},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-99471},
  year      = {2014},
  abstract  = {Elaboration of switchable surfaces represents an interesting way for the development of a new generation of electrochemical sensors. In this paper, a method for growing thermoresponsive polymer brushes from a gold surface pre-modified with polyethyleneimine (PEI), subsequent layer-by-layer polyelectrolyte assembly and adsorption of a charged macroinitiator is described. We propose an easy method for monitoring the coil-to-globule phase transition of the polymer brush using an electrochemical quartz crystal microbalance with dissipation (E-QCM-D). The surface of these polymer modified electrodes shows reversible switching from the swollen to the collapsed state with temperature. As demonstrated from E-QCM-D measurements using an original signal processing method, the switch is operating in three reversible steps related to different interfacial viscosities. Moreover, it is shown that the one electron oxidation of ferrocene carboxylic acid is dramatically affected by the change from the swollen to the collapsed state of the polymer brush, showing a spectacular 86\% decrease of the charge transfer resistance between the two states.},
  language  = {en}
}
@misc{NeffevonRuestenLangeBrauneetal.2014,
  author    = {Neffe, Axel T. and von R{\"u}sten-Lange, Maik and Braune, Steffen and L{\"u}tzow, Karola and Roch, Toralf and Richau, Klaus and Kr{\"u}ger, Anne and Becherer, Tobias and Th{\"u}nemann, Andreas F. and Jung, Friedrich and Haag, Rainer and Lendlein, Andreas},
  title     = {Multivalent grafting of hyperbranched oligo- and polyglycerols shielding rough membranes to mediate hemocompatibility},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-99444},
  year      = {2014},
  abstract  = {Hemocompatible materials are needed for internal and extracorporeal biomedical applications, which should be realizable by reducing protein and thrombocyte adhesion to such materials. Polyethers have been demonstrated to be highly efficient in this respect on smooth surfaces. Here, we investigate the grafting of oligo- and polyglycerols to rough poly(ether imide) membranes as a polymer relevant to biomedical applications and show the reduction of protein and thrombocyte adhesion as well as thrombocyte activation. It could be demonstrated that, by performing surface grafting with oligo- and polyglycerols of relatively high polydispersity (>1.5) and several reactive groups for surface anchoring, full surface shielding can be reached, which leads to reduced protein adsorption of albumin and fibrinogen. In addition, adherent thrombocytes were not activated. This could be clearly shown by immunostaining adherent proteins and analyzing the thrombocyte covered area. The presented work provides an important strategy for the development of application relevant hemocompatible 3D structured materials.},
  language  = {en}
}
@misc{SchmidtBehlLendleinetal.2014,
  author    = {Schmidt, Christian and Behl, Marc and Lendlein, Andreas and Bauermann, Sabine},
  title     = {Synthesis of high molecular weight polyglycolide in supercritical carbon dioxide},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-99439},
  year      = {2014},
  abstract  = {Polyglycolide (PGA) is a biodegradable polymer with multiple applications in the medical sector. Here the synthesis of high molecular weight polyglycolide by ring-opening polymerization of diglycolide is reported. For the first time stabilizer free supercritical carbon dioxide (scCO2) was used as a reaction medium. scCO2 allowed for a reduction in reaction temperature compared to conventional processes. Together with the lowering of monomer concentration and consequently reduced heat generation compared to bulk reactions thermal decomposition of the product occurring already during polymerization is strongly reduced. The reaction temperatures and pressures were varied between 120 and 150 °C and 145 to 1400 bar. Tin(II) ethyl hexanoate and 1-dodecanol were used as catalyst and initiator, respectively. The highest number average molecular weight of 31 200 g mol-1 was obtained in 5 hours from polymerization at 120 °C and 530 bar. In all cases the products were obtained as a dry white powder. Remarkably, independent of molecular weight the melting temperatures were always at (219 ± 2) °C.},
  language  = {en}
}
@misc{XieHuangTitiricietal.2014,
  author    = {Xie, Zai-Lai and Huang, Xing and Titirici, Maria-Magdalena and Taubert, Andreas},
  title     = {Mesoporous graphite nanoflakes via ionothermal carbonization of fructose and their use in dye removal},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-99427},
  year      = {2014},
  abstract  = {The large-scale green synthesis of graphene-type two-dimensional materials is still challenging. Herein, we describe the ionothermal synthesis of carbon-based composites from fructose in the iron-containing ionic liquid 1-butyl-3-methylimidazolium tetrachloridoferrate(III), [Bmim][FeCl4] serving as solvent, catalyst, and template for product formation. The resulting composites consist of oligo-layer graphite nanoflakes and iron carbide particles. The mesoporosity, strong magnetic moment, and high specific surface area of the composites make them attractive for water purification with facile magnetic separation. Moreover, Fe3Cfree graphite can be obtained via acid etching, providing access to fairly large amounts of graphite material. The current approach is versatile and scalable, and thus opens the door to ionothermal synthesis towards the larger-scale synthesis of materials that are, although not made via a sustainable process, useful for water treatment such as the removal of organic molecules.},
  language  = {en}
}
@misc{WęcławskiTasiorHammannetal.2014,
  author    = {Węcławski, Marek K. and Tasior, Mariusz and Hammann, Tommy and Cywiński, Piotr J. and Gryko, Daniel T.},
  title     = {From π-expanded coumarins to π-expanded pentacenes},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-98822},
  pages     = {4},
  year      = {2014},
  abstract  = {The synthesis of two novel types of π-expanded coumarins has been developed. Modified Knoevenagel bis-condensation afforded 3,9-dioxa-perylene-2,8-diones. Subsequent oxidative aromatic coupling or light driven electrocyclization reaction led to dibenzo-1,7-dioxacoronene-2,8-dione. Unparalleled synthetic simplicity, straightforward purification and superb optical properties have the potential to bring these perylene and coronene analogs towards various applications.},
  language  = {en}
}
@misc{PlehnMegowMay2014,
  author    = {Plehn, Thomas and Megow, J{\"o}rg and May, Volkhard},
  title     = {Concerted charge and energy transfer processes in a highly flexible fullerene-dye system},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-98791},
  pages     = {10},
  year      = {2014},
  abstract  = {Photoinduced excitation energy transfer and accompanying charge separation are elucidated for a supramolecular system of a single fullerene covalently linked to six pyropheophorbide-a dye molecules. Molecular dynamics simulations are performed to gain an atomistic picture of the architecture and the surrounding solvent. Excitation energy transfer among the dye molecules and electron transfer from the excited dyes to the fullerene are described by a mixed quantum-classical version of the F{\"o}rster rate and the semiclassical Marcus rate, respectively. The mean characteristic time of energy redistribution lies in the range of 10 ps, while electron transfer proceeds within 150 ps. In between, on a 20 to 50 ps time-scale, conformational changes take place in the system. This temporal hierarchy of processes guarantees efficient charge separation, if the structure is exposed to a solvent. The fast energy transfer can adopt the dye excitation to the actual conformation. In this sense, the probability to achieve charge separation is large enough since any dominance of unfavorable conformations that exhibit a large dye-fullerene distance is circumvented. And the slow electron transfer may realize an averaging with respect to different conformations. To confirm the reliability of our computations, ensemble measurements on the charge separation dynamics are simulated and a very good agreement with the experimental data is obtained.},
  language  = {en}
}