@article{ZimmermannJohnGrigorievetal.2018,
  author    = {Zimmermann, Marc and John, Daniela and Grigoriev, Dmitry and Puretskiy, Nikolay and B{\"o}ker, Alexander},
  title     = {From 2D to 3D patches on multifunctional particles},
  series = {Soft matter},
  volume    = {14},
  journal   = {Soft matter},
  number    = {12},
  publisher = {Royal Society of Chemistry},
  address   = {Cambridge},
  issn      = {1744-683X},
  doi       = {10.1039/c8sm00163d},
  pages     = {2301 -- 2309},
  year      = {2018},
  abstract  = {A straightforward approach for the precise multifunctional surface modification of particles with three-dimensional patches using microcontact printing is presented. By comparison to previous works it was possible to not only control the diameter, but also to finely tune the thickness of the deposited layer, opening up the way for three-dimensional structures and orthogonal multifunctionality. The use of PEI as polymeric ink, PDMS stamps for microcontact printing on silica particles and the influence of different solvents during particle release on the creation of functional particles with three-dimensional patches are described. Finally, by introducing fluorescent properties by incorporation of quantum dots into patches and by particle self-assembly via avidin-biotin coupling, the versatility of this novel modification method is demonstrated.},
  language  = {en}
}
@article{ZivanovicKochovskiArenzetal.2018,
  author    = {Zivanovic, Vesna and Kochovski, Zdravko and Arenz, Christoph and Lu, Yan and Kneipp, Janina},
  title     = {SERS and Cryo-EM Directly Reveal Different Liposome Structures during Interaction with Gold Nanoparticles},
  series = {The journal of physical chemistry letters},
  volume    = {9},
  journal   = {The journal of physical chemistry letters},
  number    = {23},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {1948-7185},
  doi       = {10.1021/acs.jpclett.8b03191},
  pages     = {6767 -- 6772},
  year      = {2018},
  abstract  = {The combination of gold nanoparticles with liposomes is important for nano- and biotechnology. Here, we present direct, label-free characterization of liposome structure and composition at the site of its interaction with citrate-stabilized gold nanoparticles by surface-enhanced Raman scattering (SERS) and cryogenic electron microscopy (cryo-EM). Evidenced by the vibrational spectra and cryo-EM, the gold nanoparticles destroy the bilayer structure of interacting liposomes in the presence of a high amount of citrate, while at lower citrate concentration the nanoparticles interact with the surface of the intact liposomes. The spectra of phosphatidylcholine and phosphatidylcholine/sphingomyelin liposomes show that at the site of interaction the lipid chains are in the gel phase. The SERS spectra indicate that cholesterol has strong effects on the contacts of the vesicles with the nanoparticles. By combining cryo-EM and SERS, the structure and properties of lipid nanoparticle composites could be tailored for the development of drug delivery systems.},
  language  = {en}
}
@article{OenerQuerebilloDavidetal.2018,
  author    = {{\"O}ner, Ibrahim Halil and Querebillo, Christine Joy and David, Christin and Gernert, Ulrich and Walter, Carsten and Driess, Matthias and Leimk{\"u}hler, Silke and Ly, Khoa Hoang and Weidinger, Inez M.},
  title     = {High electromagnetic field enhancement of TiO2 nanotube electrodes},
  series = {Angewandte Chemie : a journal of the Gesellschaft Deutscher Chemiker ; International edition},
  volume    = {57},
  journal   = {Angewandte Chemie : a journal of the Gesellschaft Deutscher Chemiker ; International edition},
  number    = {24},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1433-7851},
  doi       = {10.1002/anie.201802597},
  pages     = {7225 -- 7229},
  year      = {2018},
  abstract  = {We present the fabrication of TiO2 nanotube electrodes with high biocompatibility and extraordinary spectroscopic properties. Intense surface-enhanced resonance Raman signals of the heme unit of the redox enzyme Cytochromeb(5) were observed upon covalent immobilization of the protein matrix on the TiO2 surface, revealing overall preserved structural integrity and redox behavior. The enhancement factor could be rationally controlled by varying the electrode annealing temperature, reaching a record maximum value of over 70 at 475 degrees C. For the first time, such high values are reported for non-directly surface-interacting probes, for which the involvement of charge-transfer processes in signal amplification can be excluded. The origin of the surface enhancement is exclusively attributed to enhanced localized electric fields resulting from the specific optical properties of the nanotubular geometry of the electrode.},
  language  = {en}
}