1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.

Surface and Colloid Science

http://wwwcourses.sens.buffalo.edu/ce435/Riess03.pdf

Micellization of block copolymers

1. Multifunctional Initiators. 3749 2. Multifunctional Linking Agents 3751 3. Use of Difunctional Monomers 3754 B. Star−Block Copolymers 3754 C. Functionalized Stars 3755 1. Functionalized Initiators 3755 2. Functionalized Terminating Agents 3756 D. Asymmetric Stars 3757 1. Molecular Weight Asymmetry 3757 2. Functional Group Asymmetry 3760 3. Topological Asymmetry 3761 E. Miktoarm Star Polymers 3761 1. Chlorosilane Method 3761 2. Divinylbenzene Method 3766 3. Diphenylethylene Derivative Method 3766 4. Synthesis of Miktoarm Stars by Other Methods 3770

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Polymers with Complex Architecture by Living Anionic Polymerization

https://nanobiotec.iqm.unicamp.br/download/sdarticle3.pdf

Long circulating microparticulate drug carriers

The adsorption of model proteins onto brush-coated surfaces can occur via two modes. Primary adsorption at the surface, where short range attraction is dominant, is important for small proteins and may be repressed by increasing the grafting density. Secondary adsorption, due to van der Waals attraction, occurs at the outer edge of the brush. Large rodlike proteins are likely to adsorb in this fashion. This mode may be repressed by increasing the brush thickness. The thermodynamics and kinetics of adsorption of model proteins are considered within a simple analytical theory distinguishing between the different adsorption mechanisms of small and big proteins.

Polymer Brushes that Resist Adsorption of Model Proteins: Design Parameters

Micellization in water of two homologous series of AB-type diblock copolymers, composed of polystyrene (PS) as the A block and poly(ethylene oxide) (PEO) as the B block, were investigated by small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS). The copolymers have molecular weights Mn in the range 2 000—34 800, and have in a given series, the same number of repeating units of the PS block, (NPS = 10 and 38), and a variable number of repeating units of the PEO block (NPEO values in the range 23–704). In order to avoid secondary association of micelles, a dialysis technique was used to prepare the micellar systems, in the case of copolymers having high Mn values of the PS block. The experimental micelle properties such as the core radius Rc and the aggregation number N of non-equilibrium structures, so called “frozen micelles”, obtained by dialysis, were found to be independent of the copolymer characteristics. However, for equilibrium structures, obtained by direct solubilization of the copolymers (NPS = 10) in water, Rc and N were found to decrease with increasing NPEO for the homologous series.

Structure of polystyrene-block-poly(ethylene oxide) diblock copolymer micelles in water

Micelle formation in THF-methanol, 1,2-dichloroethane-methanol, THF-water, and water solutions by PS-PEO diblock copolymers was studied by the fluorescence spectroscopy. For this purpose, a series of PS-PEO copolymers was labeled by the phenanthrene or anthracene groups at the block junctions. The chromophore contents in copolymers were determined by the absorbance spectroscopy using suitable model compounds. When micelles were present, intramicellar nonradiative energy transfer could be observed. For the PS-PEO copolymer (M n =114 000, 93 weight % PEO) we find the onset of micelle formation in water in the range of 10×10 -3 g/L (9×10 -8 M)

Investigation of Polystyrene-Poly(ethylene oxide) Block Copolymer Micelle Formation in Organic and Aqueous Solutions by Nonradiative Energy Transfer Experiments

The synthesis of an amphiphilic triarm star copolymer based on polystyrene, poly(ethylene oxide) and poly(e-caprolactone) block has been achieved by a novel strategy which consists in the preparation of a diblock copolymer, polystyrene-block-poly(ethylene oxide), having a protected anionic initiator group at the junction of the two blocks. After deprotection, this function is activated by a coloured and weakly basic carbanion. The generated alcoholate initiates the e-caprolactone anionic polymerization.

Synthesis of an amphiphilic triarm star copolymer based on polystyrene, poly(ethylene oxide) and poly(ε-caprolactone)

We describe the synthesis and the characterization of amphiphilic triarm star block copolymers based on polystyrene, poly(methyl methacrylate), poly(e caprolactone), poly(l lactide) and poly(ethylene oxide) blocks. This synthesis has been achieved by a new route consisting in 2 successive initiation steps on a core molecule (a 1,1-diphenyl-ethylene derivative bearing a protected hydroxy function) located at the end of a first block. Some results on adsorption onto TiO2 and micellization studies are given. Preliminary results on solid state indicate an increase of the miscibility of the different incompatible blocks.

Synthesis of amphiphilic triarm star block copolymers

Polystyrene/poly(ethylene oxide) diblock copolymers bearing anthracene or phenanthrene groups at the block junctions were synthesized by sequential anionic polymerization using cumylpotassium as initiator. Labelled copolymers were characterized by means of ultraviolet (UV) spectroscopy, gel-permeation chromatography (GPC) and 1H NMR spectroscopy. The solutions of the prepared copolymers in water and 1,2-dichloroethane/methanol mixtures were studied by fluorescence spectroscopy. The intermolecular energy transfer process confirms the presence of organized structures (micelles) in solutions.

Guy Hurtrez

Papers

Structure of polystyrene-block-poly(ethylene oxide) diblock copolymer micelles in water

Investigation of Polystyrene-Poly(ethylene oxide) Block Copolymer Micelle Formation in Organic and Aqueous Solutions by Nonradiative Energy Transfer Experiments

Synthesis of an amphiphilic triarm star copolymer based on polystyrene, poly(ethylene oxide) and poly(ε-caprolactone)

Synthesis of amphiphilic triarm star block copolymers

Synthesis of chromophore‐labelled polystyrene/poly(ethylene oxide) diblock copolymers