Vana, Philipp

[["dc.bibliographiccitation.firstpage","2017"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Langmuir"],["dc.bibliographiccitation.lastpage","2026"],["dc.bibliographiccitation.volume","33"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Tang, Qiyun"],["dc.contributor.author","Glatter, Otto"],["dc.contributor.author","Müller, Marcus"],["dc.contributor.author","Vana, Philipp"],["dc.date.accessioned","2018-08-15T14:19:43Z"],["dc.date.available","2018-08-15T14:19:43Z"],["dc.date.issued","2017"],["dc.description.abstract","Planet–satellite nanostructures from RAFT star polymers and larger (planet) as well as smaller (satellite) gold nanoparticles are analyzed in experiments and computer simulations regarding the influence of arm number of star polymers. A uniform scaling behavior of planet–satellite distances as a function of arm length was found both in the dried state (via transmission electron microscopy) after casting the nanostructures on surfaces and in the colloidally dispersed state (via simulations and small-angle X-ray scattering) when 2-, 3-, and 6-arm star polymers were employed. This indicates that the planet–satellite distances are mainly determined by the arm length of star polymers. The observed discrepancy between TEM and simulated distances can be attributed to the difference of polymer configurations in dried and dispersed state. Our results also show that these distances are controlled by the density of star polymers end groups, and the number of grabbed satellite particles is determined by the magnitude of the corresponding density. These findings demonstrate the feasibility to precisely control the planet–satellite structures at the nanoscale."],["dc.identifier.doi","10.1021/acs.langmuir.6b04473"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15309"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","Uniform Distance Scaling Behavior of Planet-Satellite Nanostructures Made by Star Polymers"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1227"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","ACS Macro Letters"],["dc.bibliographiccitation.lastpage","1231"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Peng, Wentao"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Vana, Philipp"],["dc.date.accessioned","2018-08-15T14:54:10Z"],["dc.date.available","2018-08-15T14:54:10Z"],["dc.date.issued","2016"],["dc.description.abstract","The hierarchical self-assembly of distinct nanoelements into precisely ordered nanostructures requires efficient and flexible fabrication strategies. Herein, we report the precise fabrication of bimetallic gold-planet–silver-satellite nanoparticle-arrangements employing RAFT star polymers as particle linker connecting gold nanoparticles (AuNPs) and silver nanoparticles (AgNPs) with judiciously modified surface activity. The strengths of this approach include the adjustability of interparticle distances by tailoring the star polymer molar mass. The prepared nanoassemblies have well-defined structures in which a planet AuNP (∼13 nm) is encompassed by several satellite AgNPs (∼8 nm), thus incorporating the properties of both AuNPs and AgNPs, as confirmed by transmission electron microscopy and UV–vis spectra. Our results highlight the general applicability of RAFT star polymers as a nanosynthesis platform for synthesizing noble metal nanocomposites."],["dc.identifier.doi","10.1021/acsmacrolett.6b00681"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15311"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Gold-Planet–Silver-Satellite Nanostructures Using RAFT Star Polymer"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","7344"],["dc.bibliographiccitation.issue","18"],["dc.bibliographiccitation.journal","Macromolecules"],["dc.bibliographiccitation.lastpage","7350"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Glatter, Otto"],["dc.contributor.author","Vana, Philipp"],["dc.date.accessioned","2018-08-14T15:46:26Z"],["dc.date.available","2018-08-14T15:46:26Z"],["dc.date.issued","2017"],["dc.description.abstract","Structural plasticity and its control at the nanoscale are a vivid area of material science. In this contribution, we report a conceptually simple and versatile strategy for the formation of reconfigurable nanoparticle arrangements. The key role in our approach is played by star block copolymers from controlled radical RAFT polymerization, which fulfill the dual task of guiding the particle arrangement and also of equipping the nanomaterials with stimulus-responsiveness. By virtue of their block structure, the star polymers provide at the same time colloidal stability and responsive properties. Structural switching in response to the applied stimulus was investigated by means of small-angle X-ray scattering and dynamic light scattering. The developed approach is general, easy to implement, and may provide new prospects for the development of colloidal actuators, nanoscale materials with switchable properties, and nanoscale machines."],["dc.identifier.doi","10.1021/acs.macromol.7b01267"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15299"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","Stimulus-Responsive Planet–Satellite Nanostructures as Colloidal Actuators"],["dc.title.subtitle","Reversible Contraction and Expansion of the Planet–Satellite Distance"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","293"],["dc.bibliographiccitation.lastpage","307"],["dc.bibliographiccitation.seriesnr","1188"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Ebeling, Bastian"],["dc.contributor.author","Vana, Philipp"],["dc.contributor.editor","Matyjaszewski, Krzysztof"],["dc.contributor.editor","Sumerlin, Brent"],["dc.contributor.editor","Tsarevsky, Nicolay V."],["dc.contributor.editor","Chiefari, John"],["dc.date.accessioned","2018-08-16T13:58:57Z"],["dc.date.available","2018-08-16T13:58:57Z"],["dc.date.issued","2015"],["dc.description.abstract","The formation of nanocomposites from gold nanoparticles and RAFT polymers has been investigated in detail. The binding mode of linear multifunctional RAFT polymers on the surface of two different types of nanoparticles was examined. For gold nanoparticles from citrate-reduction, multidentate binding of this type of polymer was observed, resulting in polymer loops on the nanoparticle surface. In contrast, smaller nanoparticles prepared using the two-phase Brust-Schiffrin method were shown to form cross-linked particle networks when treated with multifunctional RAFT polymers. The particle density in these superstructures was correlated with the degree of polymerization of the cross-linking macromolecules. In addition, the power of RAFT star polymers with external functional groups in the tailored assembly of gold nanoparticles was demonstrated by the controlled formation of planet-satellite nanostructures comprising both mentioned types of gold nanoparticles."],["dc.identifier.doi","10.1021/bk-2015-1188.ch018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15371"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.publisher","American Chemical Society"],["dc.publisher.place","Washington"],["dc.relation.crisseries","ACS Symposium Series"],["dc.relation.doi","10.1021/bk-2015-1188"],["dc.relation.isbn","978-0-8412-3050-7"],["dc.relation.ispartof","Controlled Radical Polymerization: Materials"],["dc.relation.ispartofseries","ACS Symposium Series; 1188"],["dc.title","Design Strategies for the Fabrication of Tailored Nanocomposites via RAFT Polymerization"],["dc.type","book_chapter"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY"],["dc.bibliographiccitation.volume","248"],["dc.contributor.author","Ebeling, Bastian"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Vana, Philipp"],["dc.date.accessioned","2018-11-07T09:36:40Z"],["dc.date.available","2018-11-07T09:36:40Z"],["dc.date.issued","2014"],["dc.identifier.isi","000349167406054"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32670"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Chemical Soc"],["dc.publisher.place","Washington"],["dc.relation.conference","248th National Meeting of the American-Chemical-Society (ACS)"],["dc.relation.eventlocation","San Francisco, CA"],["dc.relation.issn","0065-7727"],["dc.title","Tailoring nanocomposites using RAFT: Super-assemblies of gold nanoparticles and multiblock copolymers"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1742"],["dc.bibliographiccitation.issue","21"],["dc.bibliographiccitation.journal","Macromolecular Rapid Communications"],["dc.bibliographiccitation.lastpage","1747"],["dc.bibliographiccitation.volume","37"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Lopatin, Sergei"],["dc.contributor.author","Vana, Philipp"],["dc.date.accessioned","2018-08-15T14:44:16Z"],["dc.date.available","2018-08-15T14:44:16Z"],["dc.date.issued","2016"],["dc.description.abstract","The development of a straightforward method is reported to form hybrid polymer/gold planet-satellite nanostructures (PlSNs) with functional polymer. Polyacrylate type polymer with benzyl chloride in its backbone as a macromolecular tracer is synthesized to study its localization within PlSNs by analyzing the elemental distribution of chlorine. The functionalized nanohybrid structures are analyzed by scanning transmission electron microscopy, electron energy loss spectroscopy, and spectrum imaging. The results show that the RAFT (reversible addition-fragmentation chain transfer) polymers' sulfur containing end groups are colocalized at the gold cores, both within nanohybrids of simple core-shell morphology and within higher order PlSNs, providing microscopic evidence for the affinity of the RAFT group toward gold surfaces."],["dc.identifier.doi","10.1002/marc.201600480"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15310"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Functionalization of Planet-Satellite Nanostructures Revealed by Nanoscopic Localization of Distinct Macromolecular Species"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","12596"],["dc.bibliographiccitation.issue","30"],["dc.bibliographiccitation.journal","Journal of the American Chemical Society"],["dc.bibliographiccitation.lastpage","12603"],["dc.bibliographiccitation.volume","134"],["dc.contributor.author","Gody, Guillaume"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Moraes, John"],["dc.contributor.author","Vana, Philipp"],["dc.contributor.author","Maschmeyer, Thomas"],["dc.contributor.author","Perrier, Sebastien"],["dc.date.accessioned","2018-11-07T09:07:46Z"],["dc.date.available","2018-11-07T09:07:46Z"],["dc.date.issued","2012"],["dc.description.abstract","A new methodology has been developed for preparing alpha-functional polymers in a one-pot simultaneous polymerization/isocyanate \"click\" reaction. Our original synthetic strategy is based on the preparation of a carbonyl-azide chain transfer agent (CTA) precursor that undergoes the Curtius rearrangement in situ during reversible addition-fragmentation chain transfer (RAFT) polymerization yielding well-controlled alpha-isocyanate modified polymers. This strategy overcomes numerous difficulties associated with the synthesis of a polymerization mediator bearing an isocyanate at the R group and with the handling of such a reactive functionality. This new carbonyl-azide CTA can control the polymerization of a wide range of monomers, including (meth)acrylates, acrylamides, and styrenes (M-n = 2-30 kDa; D = 1.16-1.38). We also show that this carbonyl-azide CTA can be used as a universal platform for the synthesis of alpha-end-functionalized polymers in a one-pot RAFT polymerization/isocyanate \"click\" procedure."],["dc.identifier.doi","10.1021/ja3030643"],["dc.identifier.isi","000306942600053"],["dc.identifier.pmid","22731785"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25876"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Chemical Soc"],["dc.relation.issn","0002-7863"],["dc.title","One-Pot RAFT/\"Click\" Chemistry via Isocyanates: Efficient Synthesis of alpha-End-Functionalized Polymers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5008"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Biomacromolecules"],["dc.bibliographiccitation.lastpage","5020"],["dc.bibliographiccitation.volume","21"],["dc.contributor.author","Tang, Qiyun"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Vana, Philipp"],["dc.contributor.author","Müller, Marcus"],["dc.date.accessioned","2021-04-14T08:27:48Z"],["dc.date.available","2021-04-14T08:27:48Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1021/acs.biomac.0c01184"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82409"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1526-4602"],["dc.relation.issn","1525-7797"],["dc.title","Prediction of Kinetically Stable Nanotheranostic Superstructures: Integral of First-Passage Times from Constrained Simulations"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","503"],["dc.bibliographiccitation.journal","Polymer"],["dc.bibliographiccitation.lastpage","508"],["dc.bibliographiccitation.volume","107"],["dc.contributor.author","Huebner, Dennis"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Vana, Philipp"],["dc.date.accessioned","2018-08-15T16:08:07Z"],["dc.date.available","2018-08-15T16:08:07Z"],["dc.date.issued","2016"],["dc.description.abstract","The light-induced self-assembly of gold nanoparticles was studied systematically. A methacrylic type monomer with an azobenzene sidechain was polymerized in a reversible addition–fragmentation chain transfer (RAFT) polymerization. The resulting light responsive polymer was grafted to gold nanoparticles via the RAFT group. UV-light induced trans to cis isomerization of the azobenzene moieties triggers the aggregation of the polymer–gold hybrid particles in toluene dispersion. The thermally induced cis to trans relaxation was found to be significantly slower than for small molecules at gold surfaces. The self-assembly was followed by dynamic light scattering (DLS), UV/vis spectroscopy and transmission electron microscopy (TEM). The density of primary gold particles within the self-assembled aggregates can be tuned by varying the molar mass of the grafted polymer."],["dc.identifier.doi","10.1016/j.polymer.2016.05.073"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15315"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area A | A03 Thermischer Transport in Polymernanostrukturen"],["dc.title","Light-induced self-assembly of gold nanoparticles with a photoresponsive polymer shell"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","12639"],["dc.bibliographiccitation.issue","46"],["dc.bibliographiccitation.journal","Angewandte Chemie International Edition"],["dc.bibliographiccitation.lastpage","12642"],["dc.bibliographiccitation.volume","53"],["dc.contributor.author","Rossner, Christian"],["dc.contributor.author","Vana, Philipp"],["dc.date.accessioned","2018-11-07T09:32:42Z"],["dc.date.available","2018-11-07T09:32:42Z"],["dc.date.issued","2014"],["dc.description.abstract","The investigation and application of complex nanostructures requires the hierarchical arrangement of distinct domains on a small scale. Herein, we report a method to prepare planet-satellite arrangements using RAFT polymers. Our approach is based on star polymers decorated with trithiocarbonate groups on their outer periphery that attach to gold surfaces and thus provide the polymer with the ability to connect (larger) gold nanoparticle planets with (smaller) gold nanoparticle satellites. By adjusting the molecular weight of the polymeric linker, nanostructures with tailored planet-satellite distances, as evidenced by transmission electron microscopy, are obtained. This strategy offers a straightforward way to prepare gold nanoparticle scaffolds with multiple reactive functionalities at defined distances from the central core."],["dc.description.sponsorship","Fonds der Chemischen Industrie"],["dc.identifier.doi","10.1002/anie.201406854"],["dc.identifier.isi","000344649900052"],["dc.identifier.pmid","25138594"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31805"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-v C H Verlag Gmbh"],["dc.relation.issn","1521-3773"],["dc.relation.issn","1433-7851"],["dc.title","Planet-Satellite Nanostructures Made To Order by RAFT Star Polymers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]