@article{LeiendeckerLichtBorghsetal.2018,
  author    = {Leiendecker, Mai-Thi and Licht, Christopher J. and Borghs, Jannik and Mooney, David J. and Zimmermann, Marc and B{\"o}ker, Alexander},
  title     = {Physical polyurethane hydrogels via charge shielding through acids or salts},
  series = {Macromolecular rapid communications},
  volume    = {39},
  journal   = {Macromolecular rapid communications},
  number    = {7},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1022-1336},
  doi       = {10.1002/marc.201700711},
  pages     = {5},
  year      = {2018},
  abstract  = {Physical hydrogels with tunable stress-relaxation and excellent stress recovery are formed from anionic polyurethanes via addition of acids, monovalent salts, or divalent salts. Gel properties can be widely adjusted through pH, salt valence, salt concentration, and monomer composition. We propose and investigate a novel gelation mechanism based on a colloidal system interacting through charge repulsion and chrage shielding, allowing a broad use of the material, from acidic (pH 4-5.5) to pH-neutral hydrogels with Young's moduli ranging from 10 to 140 kPa.},
  language  = {en}
}
@article{JohnZimmermannBoeker2018,
  author    = {John, Daniela and Zimmermann, Marc and B{\"o}ker, Alexander},
  title     = {Generation of 3-dimensional multi-patches on silica particles via printing with wrinkled stamps},
  series = {Soft matter},
  volume    = {14},
  journal   = {Soft matter},
  number    = {16},
  publisher = {Royal Society of Chemistry},
  address   = {Cambridge},
  issn      = {1744-683X},
  doi       = {10.1039/c8sm00224j},
  pages     = {3057 -- 3062},
  year      = {2018},
  abstract  = {A simple route towards patchy particles with anisotropic patches with respect to a different functionality and directionality is presented. This method is based on microcontact printing of positively charged polyethylenimine (PEI) on silica particles using wrinkled stamps. Due to the wrinkled surface, the number of patches on the particles as well as the distance between two patches can be controlled.},
  language  = {en}
}
@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{ZimmermannGrigorievPuretskiyetal.2018,
  author    = {Zimmermann, Marc and Grigoriev, Dmitry and Puretskiy, Nikolay and B{\"o}ker, Alexander},
  title     = {Characteristics of microcontact printing with polyelectrolyte ink for the precise preparation of patches on silica particles},
  series = {RSC Advances},
  volume    = {8},
  journal   = {RSC Advances},
  number    = {69},
  publisher = {Royal Society of Chemistry},
  address   = {Cambridge},
  issn      = {2046-2069},
  doi       = {10.1039/c8ra07955b},
  pages     = {39241 -- 39247},
  year      = {2018},
  abstract  = {This publication demonstrates the abilities of a precise and straightforward microcontact printing approach for the preparation of patchy silica particles. In a broad particle size range, it is possible to finely tune the number and parameters of three-dimensional patches like diameter and thickness using only polyethyleneimine ink, poly(dimethoxysilane) as stamp material and a suitable release solvent.},
  language  = {en}
}