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Packing patterns of silica nanoparticles on surfaces of armored polystyrene latex particles
Sara Fortuna, Catheline A. L. Colard, Stefan A. F. Bon, Alessandro Troisi, 2009, original scientific article

Abstract: Fascinating packing patterns of identical spherical and discotic objects on curved surfaces occur readily in nature and science. Examples include C60 fullerenes,(1, 2)13-atom cuboctahedral metal clusters,(3) and S-layer proteins on outer cell membranes.(4) Numerous situations with surface-arranged objects of variable size also exist, such as the lenses on insect eyes, biomineralized shells on coccolithophorids,(5) and solid-stabilized emulsion droplets(6) and bubbles.(7) The influence of size variations on these packing patterns, however, is studied sparsely. Here we investigate the packing of nanosized silica particles on the surface of polystyrene latex particles fabricated by Pickering miniemulsion polymerization of submicrometer-sized armored monomer droplets. We are able to rationalize the experimental morphology and the nearest-neighbor distribution with the help of Monte Carlo simulations. We show that broadening of the nanoparticle size distribution has pronounced effects on the self-assembled equilibrium packing structures, with original 12-point dislocations or grain-boundary scars gradually fading out.
Found in: osebi
Keywords: packing patterns, silica, simulation, Monte Carlo, order, disorder, transition, armored particles, nanoparticles, Pickering emulsion
Published: 10.10.2016; Views: 1527; Downloads: 0
.pdf Fulltext (3,85 MB)

4.
Polymer Vesicles with a Colloidal Armor of Nanoparticles
Rong Chen, Daniel J. G. Pearce, Sara Fortuna, David L. Cheung, Stefan A. F. Bon, 2011, original scientific article

Abstract: The fabrication of polymer vesicles with a colloidal armor made from a variety of nanoparticles is demonstrated. In addition, it is shown that the armored supracolloidal structure can be postmodified through film-formation of soft polymer latex particles on the surface of the polymersome, hereby effectively wrapping the polymersome in a plastic bag, as well as through formation of a hydrogel by disintegrating an assembled polymer latex made from poly(ethyl acrylate-co-methacrylic acid) upon increasing the pH. Furthermore, ordering and packing patterns are briefly addressed with the aid of Monte Carlo simulations, including patterns observed when polymersomes are exposed to a binary mixture of colloids of different size.
Found in: osebi
Keywords: Pickering emultion, self-assemblt, Monte Carlo, simulation, nanoparticle, packing, pattern garnd canonical, colloids
Published: 11.10.2016; Views: 1302; Downloads: 0
.pdf Fulltext (1,43 MB)

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Self-amplified photo-induced gap quenching in a correlated electron material
Jurij Urbančič, Eich Steffen, Mathias Stefan, 2016, original scientific article

Abstract: Capturing the dynamic electronic band structure of a correlated material presents a powerful capability for uncovering the complex couplings between the electronic and structural degrees of freedom. When combined with ultrafast laser excitation, new phases of matter can result, since far-from-equilibrium excited states are instantaneously populated. Here, we elucidate a general relation between ultrafast non-equilibrium electron dynamics and the size of the characteristic energy gap in a correlated electron material. We show that carrier multiplication via impact ionization can be one of the most important processes in a gapped material, and that the speed of carrier multiplication critically depends on the size of the energy gap. In the case of the charge-density wave material 1T-TiSe 2 , our data indicate that carrier multiplication and gap dynamics mutually amplify each other, which explains—on a microscopic level—the extremely fast response of this material to ultrafast optical excitation. Self-amplified photo-induced gap quenching in a correlated electron material. Available from: https://www.researchgate.net/publication/308804379_Self-amplified_photo-induced_gap_quenching_in_a_correlated_electron_material [accessed Apr 20, 2017].
Found in: osebi
Keywords: high harmonic generation, charge-density wave material, 1T-TiSe2, non-equilibrium electron dynamics, ultrafast surface science
Published: 20.04.2017; Views: 1666; Downloads: 0
.pdf Fulltext (1,10 MB)

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Zweifelsfrei nicht komplikationslos: Adjektivderivation mit -frei/-vrij und -los/-loos im deutsch-niederländischen Sprachvergleich
Marko Simonović, Stefan Sudhof, Anke Poschmann, published scientific conference contribution abstract

Found in: osebi
Keywords: izpeljava zlaganje nizozemščina nemščina ekvivalentnost
Published: 06.02.2018; Views: 500; Downloads: 6
.pdf Fulltext (591,92 KB)
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IETI, Isogeometric Tearing and Interconnecting
Stefan K. Kleiss, Clemens Pechstein, Bert Jüttler, Satyendra Tomar, 2012, original scientific article

Found in: osebi
Keywords: isogeometric analysis, NURBS, domain decomposition, FETI, IETI
Published: 13.11.2018; Views: 348; Downloads: 0
.pdf Fulltext (1,58 MB)

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Guaranteed and sharp a posteriori error estimates in isogeometric analysis
Stefan K. Kleiss, Satyendra Tomar, 2015, original scientific article

Found in: osebi
Keywords: isogeometric analysis, B-splines and NURBS, a posteriori error estimates
Published: 13.11.2018; Views: 321; Downloads: 0
.pdf Fulltext (2,25 MB)

10.
Two-sided robust and sharp a posteriori error estimates in isogeometric discretization of elliptic problems
Stefan K. Kleiss, Satyendra Tomar, 2015, published scientific conference contribution

Found in: osebi
Keywords: isogeometric analysis, B-Splines and NURBS, a-posteriori error estimates, two-sided bounds
Published: 13.11.2018; Views: 308; Downloads: 32
.pdf Fulltext (384,16 KB)
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