TY  - JOUR
A1  - Fortes Martín, Rebeca
A1  - Thünemann, Andreas F.
A1  - Stockmann, Jörg M.
A1  - Radnik, Jörg
A1  - Koetz, Joachim
T1  - From nanoparticle heteroclusters to filament networks by self-assembly at the water-oil interface of reverse microemulsions
JF  - Langmuir : the ACS journal of surfaces and colloids / American Chemical Society
N2  - Surface self-assembly of spherical nanoparticles of sizes below 10 nm into hierarchical heterostructures is under arising development despite the inherent difficulties of obtaining complex ordering patterns on a larger scale. Due to template-mediated interactions between oil-dispersible superparamagnetic nanoparticles (MNPs) and polyethylenimine- stabilized gold nanoparticles (Au(PEI)NPs) at the water-oil interface of microemulsions, complex nanostructured films can be formed. Characterization of the reverse microemulsion phase by UV-vis absorption revealed the formation of heteroclusters from Winsor type II phases (WPII) using Aerosol-OT (AOT) as the surfactant. SAXS measurements verify the mechanism of initial nanoparticle clustering in defined dimensions. XPS suggested an influence of AOT at the MNP surface. Further, cryo-SEM and TEM visualization demonstrated the elongation of the reverse microemulsions into cylindrical, wormlike structures, which subsequently build up larger nanoparticle superstructure arrangements. Such WPII phases are thus proven to be a new form of soft template, mediating the self-assembly of different nanoparticles in hierarchical network-like filaments over a substrate during solvent evaporation.
KW  - Emulsions
KW  - Liquids
KW  - Nanoparticles
KW  - Water
KW  - X-ray scattering
Y1  - 2021
U6  - https://doi.org/10.1021/acs.langmuir.1c01348
SN  - 0743-7463
VL  - 37
IS  - 29
SP  - 8876
EP  - 8885
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Zeng, Ting
A1  - Frasca, Stefano
A1  - Rumschöttel, Jens
A1  - Koetz, Joachim
A1  - Leimkühler, Silke
A1  - Wollenberger, Ursula
T1  - Role of Conductive Nanoparticles in the Direct Unmediated Bioelectrocatalysis of Immobilized Sulfite Oxidase
JF  - Electroanalysis : an international journal devoted to fundamental and practical aspects of electroanalysis
KW  - Direct electron transfer
KW  - Protein voltammetry
KW  - Human sulfite oxidase
KW  - Bioelectrocatalysis
KW  - Nanoparticles
Y1  - 2016
U6  - https://doi.org/10.1002/elan.201600246
SN  - 1040-0397
SN  - 1521-4109
VL  - 28
SP  - 2303
EP  - 2310
PB  - Wiley-VCH
CY  - Weinheim
ER  -