Layer-by-layer adsorption of polyelectrolytes on microgels as soft and porous colloidal substrate
Final Report Abstract
This project has sucessfully shed light on the understanding of layer-by-layer (LbL) assembly of polyelectrolyte multilayers on unconventional soft and porous supports as provided by microgels. Not only do the findings in this proposal open new frontiers for such templates but they also bring up new challenges such as the unravelled behaviour of the confinement of such soft and porous particles. Highlights and milestones of this proposal can be summarised as: • Successful build-up of multilayers on soft and porous microgels. • LbL on soft and porous substrates very different from LbL on hard and rigid templates. • “Odd-even” effect on the size of the coated microgel depending on the last layer deposited (cover picture of Macromolecules 2009, 42). • The size and pH sensitivity of the coated microgels can be tuned over quite a broad range depending on the polyelectrolyte pairs. • Conditions of assembly are the determining factors that confer the inherent properties of the coated microgels. • The nature of the last layer is the decisive parameter that determines the pH sensitivity of the coated microgels. • Use of unconventional techniques (FCS) to prove successful LbL on sub-micron size particles. • The Zetasizer funded through this proposal proved useful and relevant to show internal restructuration with time and temperature.
Publications
- Progr. Colloid Polym. Sci. 2006, 133, 45–51. Surface Modification of Thermoresponsive Microgels via Layer-by-Layer Assembly of Polyelectrolyte Multilayers
Wong, J. E.; Richtering, W.
- J. Phys. Chem. B 2007, 111, 8527–8531. Direct evidence of layer-by-layer assembly of polyelectrolyte multilayers on soft and porous temperature-sensitive PNiPAM microgel using fluorescence correlation spectroscopy
Wong, J. E.; Müller, C. B.; Laschewsky, A.; Richtering, W.
- Curr. Opin. Colloid Interface Sci. 2008, 13, 403–412. Layer-by-layer assembly on stimuli-responsive microgels
Wong, J. E.; Richtering, W.
- Macromolecules 2008, 41, 1785–1790. Defined complexes of negatively charged multisensitive poly(N-isopropylacrylamideco-methacrylic acid) microgels and poly-diallydimethylammonium chloride
Kleinen, J.; Richtering, W.
- J. Phys. Chem. B 2009, 113, 15907–15913. Study of Layer-by-Layer Films on Thermoresponsive Nanogels Using Temperature- Controlled Dual-Focus Fluorescence Correlation Spectroscopy
Wong, J. E.; Mueller, C. B.; Díez-Pascual, A. M.; Richtering, W.
- Macromolecules 2009, 42, 1229– 1238 (cover picture). Layer-by-Layer Assembly of Polyelectrolyte Multilayers on Thermoresponsive P(NiPAM-co-MAA) Microgel: Effect of Ionic Strength and Molecular Weight
Wong, J. E.; Díez-Pascual, A. M.; Richtering, W.
- J Colloid Interf Sci 2010, 347, 79–89. Effect of layer-by-layer confinement of polypeptides and polysaccharides onto thermoresponsive microgels: A comparative study
Díez-Pascual, A. M.; Wong, J. E.
- Langmuir 2010, 26, 11258–11265. Influence of Architecture on the Interaction of Negatively Charged Multi-sensitive Poly(N-isopropylacrylamide)-co-Methacrylic Acid Microgels with Oppositely Charged Polyelectrolyte: Absorption vs Adsorption
Kleinen, J.; Klee, A.; Richtering, W.
- Colloid Polym Sci 2011, 289, 739–749. Polyelectrolyte microgels based on poly-N-isopropylacrylamide: influence of charge density on microgel properties, binding of poly-diallyldimethyl-ammonium chloride, and properties of polyelectrolyte complexes
Kleinen, J.; Richtering, W.
- J. Phys. Chem. B 2011, 115, 3804–3810. Rearrangements in and Release from Responsive Microgel− Polyelectrolyte Complexes Induced by Temperature and Time
Kleinen, J.; Richtering, W.
