Max Planck Institute For Kolloid

Potsdam, Germany

Max Planck Institute For Kolloid

Potsdam, Germany
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Yashchenok A.M.,Max Planck Institute For Kolloid | Delcea M.,Max Planck Institute For Kolloid | Videnova K.,Max Planck Institute For Kolloid | Jares-Erijman E.A.,University of Buenos Aires | And 4 more authors.
Angewandte Chemie - International Edition | Year: 2010

Breaking out: Liposomes that are adsorbed onto porous CaCO3 particles and that contain the peroxidase substrate Amplex Red (AR) are disrupted by ultrasonic treatment. The substrate is released and diffuses into the inner part of the multicompartment containers where the peroxidase enzyme is found, and the enzymatic reaction is triggered. This approach may be useful for the simultaneous delivery of multiple molecules into cells. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Karpitschka S.,Max Planck Institute For Kolloid | Riegler H.,Max Planck Institute For Kolloid
Langmuir | Year: 2010

Quantitative experimental data on the coalescence behavior of sessile droplets with different but completely miscible liquids are presented. The liquids consist of various aqueous mixtures of different nonvolatile diols and carbon acids with surface tensions ranging from 33 to 68 mN/m, contact angles between 9° and 20°, and viscosities from 1 to 12 cP. Two distinctly different coalescence behaviors, a delayed and a fast regime, are found. The transition between the two behaviors is remarkably sharp. It is found that the coalescence mode depends predominantly on the differences in the surface tensions of the two droplets. If the surface tension difference exceeds ∼3 mN/m, the coalescence is delayed. If it is less, droplet fusion occurs fast. Within the investigated parameter space, the transition seems independent from droplet size, absolute values of the surface tensions, and viscosity. Certain aspects of the experimental findings are explained with the simple hydrodynamic model presented in a recent publication.© 2010 American Chemical Society.

Borcia R.,TU Brandenburg | Menzel S.,TU Brandenburg | Bestehorn M.,TU Brandenburg | Karpitschka S.,Max Planck Institute For Kolloid | Riegler H.,Max Planck Institute For Kolloid
European Physical Journal E | Year: 2011

Mixing of droplets with a body of different liquids shows an interesting behavior for small contact angles at solid substrate. The droplets interact with each other, a liquid exchange appears between the approaching drops owing to surface tension gradients at the droplets interface. But the drops remain separated for some seconds (up to minutes), until the merging into a single drop occurs (Langmuir 24, 6395 (2008)). We investigate this phenomenon using lubrication approximation and phase field approach. For both methods, 2D quantitative computer simulations for delayed fusion of perfectly miscible thin liquid films/droplets with low contact angles are reported. © EDP Sciences / Società Italiana di Fisica / Springer-Verlag 2011.

Siemeling U.,University of Kassel | Bretthauer F.,University of Kassel | Bruhn C.,University of Kassel | Fellinger T.P.,Max Planck Institute For Kolloid | And 2 more authors.
Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences | Year: 2010

The surface functionalisation of gold nanoparticles (GNPs) with luminescent platinum complexes has been investigated, utilising a-lipoic acid derivatives for GNP stabilisation. Model complexes have been studied to mimic the chemisorption chemistry required to afford GNPs protected by an a-lipoic acid-based ligand shell with terminal functionalisation suitable for metal coordination, and the unambiguous binding of the cyclic disulfide moiety at a zero-valent precious metal core through oxidative addition has been confirmed by X-ray crystallography. Subsequently, gold nanoparticles bearing the a-lipoic acid-based ligand shell have been prepared and characterised, and a synthetic methodology for the immobilisation of PtII luminophores onto their surface has been established. © 2010 Verlag der Zeitschrift für Naturforschung, Tübingen.

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