Refine
Has Fulltext
- no (150)
Year of publication
Document Type
- Article (150) (remove)
Is part of the Bibliography
- yes (150)
Keywords
- Janus emulsions (5)
- Cryo-SEM (4)
- HRTEM (4)
- Interfacial tension (3)
- Microemulsions (3)
- Molecular dynamics simulations (3)
- SERS (3)
- Surfactant micelles (3)
- gold nanoparticles (3)
- mu-DSC (3)
- nanotriangles (3)
- Calcium phosphates (2)
- Direct electron transfer (2)
- Gold nanoparticles (2)
- Human sulfite oxidase (2)
- Maltose-modified PEI (2)
- Maltose-modified poly(ethyleneimine) (2)
- Microemulsion (2)
- Molecular dynamics (2)
- Nanoparticles (2)
- Network structure (2)
- Pickering emulsions (2)
- Polyampholytes (2)
- Polyethyleneimine (2)
- Raman spectroscopy (2)
- Ring tensiometry (2)
- SAXS (2)
- TEM (2)
- X-ray scattering (2)
- gold nanotriangles (2)
- microemulsion (2)
- monolayer formation (2)
- nanoparticles (2)
- polyampholytes (2)
- polyelectrolyte (2)
- tailspike protein (2)
- wavelength (2)
- 4-nitrobenzenethiol (1)
- AOT (1)
- AOT bilayer (1)
- AOT/BDAC micelles (1)
- AU (1)
- Adsorption (1)
- Alternating polyampholytes (1)
- Anisotropic gold nanoplatelets (1)
- Anti-HIV (1)
- Bentonite clay (1)
- Bioelectrocatalysis (1)
- Biomineralization (1)
- Block copolymers (1)
- Bone repair material (1)
- Cationic surfactants (1)
- CdS quantum dots (1)
- Cellular uptake (1)
- Chitosan (1)
- Composite hydrogels (1)
- DLS (1)
- DNA complexation (1)
- DNA ejection (1)
- DNA polyplexes (1)
- DNA release (1)
- DNA viruses (1)
- DNA-PEI polyplexes (1)
- Decontamination (1)
- Defects (1)
- Drop morphology (1)
- Drop profile analysis tensiometry (1)
- Dynamic light scattering (1)
- Emulsification (1)
- Emulsion destabilization (1)
- Emulsions (1)
- Enzyme catalysis (1)
- Extraction (1)
- Field flow fractionation (1)
- GOIP (1)
- Gelatin-NaCMC (1)
- Gelatin-NaPAA composites (1)
- Gelatin-chitosan composites (1)
- Gelatin-chitosan scaffolds (1)
- Gold (1)
- Gold cluster (1)
- Gold nanoparticle (1)
- Gold nanotriangles (1)
- Gold surface (1)
- Gold surfaces (1)
- Gold triangles (1)
- HK620 (1)
- Heavy metal ions (1)
- Heparin (1)
- Hexagons and nanorods (1)
- Hydrogel (1)
- Hydrogel disks (1)
- Hydrogel microparticles (1)
- Hydrogel microspheres (1)
- Hydrogels (1)
- Hydroxyethyl starch (HES) (1)
- In vivo imaging system (IVIS) (1)
- In vivo-in vitro correlation (1)
- Interfacial equilibrium (1)
- Ionic liquid (1)
- Irradiation (1)
- Janus droplets (1)
- Janus drops (1)
- Janus emulsion (1)
- Janus gels (1)
- Kinetic analysis (1)
- Kinetically controlled nanocrystal growth (1)
- L-Cysteine (1)
- LSPR (1)
- Lamellar liquid crystals (1)
- Lasers (1)
- Liquids (1)
- MD simulations (1)
- Magnetic-responsive (1)
- Magnetite and gold nanoparticles (1)
- Magnetite-gold nanoparticles (1)
- Magnetization measurements (1)
- Mesh size (1)
- Microfluidics (1)
- Morphology (1)
- Nanocrystal growth (1)
- Nanotriangle stacking and welding (1)
- Neutron spin echo (1)
- Nuclear magnetic resonance spectroscopy (1)
- O-antigen specific phage (1)
- O-antigen specificity (1)
- PEI coating (1)
- Percolation (1)
- Phospholipids (1)
- Pickering Janus emulsions (1)
- Pluronics (1)
- Polymer capped gold nanoparticles (1)
- Polymer-coating (1)
- Polypeptoids (1)
- Polyplexes (1)
- Protein delivery (1)
- Protein structure (1)
- Protein voltammetry (1)
- Release (1)
- Release studies (1)
- Ring method (1)
- SANS (1)
- SDS (1)
- SDS inverse micelle (1)
- SEM (1)
- SERS enhancement factor (1)
- Salmonella enterica (1)
- Salmonella myovirus (1)
- Satellite hybrid (1)
- Scattering (1)
- Self-assembly (1)
- Silicon (1)
- Spinning drop (1)
- Sulfite biosensor (1)
- Superparamagnetic magnetite (1)
- Supramolecular ball structure (1)
- Surface removal (1)
- Template phase (1)
- Templated self-assembly (1)
- Thermoresponsive (1)
- Toxicity (1)
- Tube-like template phase (1)
- Tubular network structure (1)
- UV-Vis-NIR (1)
- Vesicle formation (1)
- Water (1)
- Winsor phases (1)
- acidity constants (1)
- adsorption (1)
- aminothiophenol (1)
- bacteriophage (1)
- bicontinuous phase (1)
- bilayer (1)
- bioelectrocatalysis (1)
- catalysis (1)
- catanionic surfactant bilayer (1)
- catanionic vesicles (1)
- charge-transfer (1)
- chemical modification (1)
- chitosan (1)
- click chemistry (1)
- conformational transitions (1)
- contractile tail (1)
- cryogel (1)
- crystal growth (1)
- crystallization (1)
- dimensional stability (1)
- dimerization (1)
- dimerization of 4-nitrothiophenol (1)
- direct electrochemistry (1)
- drug delivery system (1)
- dye mixture (1)
- dye removal (1)
- emulsion inversion (1)
- emulsion microscopy (1)
- enhanced raman-scattering (1)
- enzyme (1)
- equilibrium topology (1)
- fluorescence (1)
- gelatin/chitosan hydrogel scaffold (1)
- gemini surfactant (1)
- glycobiology (1)
- gold cluster (1)
- gold nanoflowers (1)
- gold nanostructures (1)
- gold surface (1)
- gold-polymer hybrid shell (1)
- heartwood formation (1)
- heat measurement (1)
- human sulfite oxidase (1)
- hyaluronic acid (1)
- immobilization (1)
- in vitro particle opening (1)
- interfaces (1)
- ionic liquids (1)
- janus emulsions (1)
- l-cysteine (1)
- lipopolysaccharide (1)
- lipopolysaccharide (YLPS) (1)
- liquids (1)
- magnetic manipulation (1)
- magnetite nanoparticles (1)
- maltose-modified poly(ethyleneimine) (1)
- maltosylated poly(ethyleneimine) (1)
- metal (1)
- methyl orange (1)
- methylene blue (1)
- microemulsions (1)
- microfluidics (1)
- microgels (1)
- miscibility (1)
- molecular machine (1)
- multiple emulsion preparation (1)
- nanoflowers (1)
- nanoindentation (1)
- nanostructures (1)
- optical-properties (1)
- ordering process (1)
- pH-responsive (1)
- photocatalysis (1)
- photocurrent (1)
- podovirus (1)
- poly(acrylamide) hydrogels (1)
- polylactide (1)
- polymersomes (1)
- poly‐ ε ‐ caprolactone (1)
- protonation (1)
- radical polymerization (1)
- self-assembly (1)
- semiempirical calculations (1)
- sers (1)
- size (1)
- spiked and crumble gold nanotriangles (1)
- step (1)
- stereocomplexation (1)
- structural biology (1)
- ultrafast (1)
- undulated (1)
- undulated nanoplatelets (1)
- viscosity (1)
- water treatment (1)
- wood cell wall (1)
Temperature and polymer induced structural changes in SDS/decanol based multilamellar vesicles
(2002)
The paper is focused on the formation and redispersion of monodisperse BaSO4 nanoparticles in polyelectrolyte- modified microemulsions. It is shown that a cationic polyelectrolyte of low molar mass, e.g. poly(dially1dimethylammonium chloride) (PDADMAC), can be incorporated into the individual inverse microemulsion droplets (L2 phase) consisting of heptanol, water, and an amphoteric surfactant with a sulfobetaine head group. These PDADMAC- filled microemulsion droplets can be successfully used as a template phase for the nanoparticle formation. The monodisperse BaSO4 nanoparticles are produced by a simple mixing procedure and can be redispersed after solvent evaporation without a change in particle dimensions. Dynamic and electrophoretical light scattering in combination with sedimentation experiments in the analytical Ultracentrifuge of the redispersed powder show polyelectrolyte-stabilized nanoparticles with diameters of about 6 nm. The polyelectrolyte shows a "size control effect", which can be explained by the polyelectrolyte-surfactant interactions in relation to the polyelectrolyte-nanoparticle interactions during the particle growth, solvent evaporation and redispersion process. However, the approach used here opens away to produce different types of polyelectrolyte-stabilized nanoparticles (including rare metals, semiconductors, carbonates or oxides) of very small dimensions. (C) 2004 Elsevier B.V. All rights reserved
Polymer-induced structural changes in lecithin/sodium dodecyl sulfate-based multilamellar vesicles
(2004)
Aqueous concentrated lecithin mixtures (asolectin from soybean) show typical lamellar liquid crystalline behavior and the individual lamellae tend to form spherical supramolecular structures, i.e., multilamellar vesicles. When part of the lecithin is replaced by the anionic surfactant sodium dodecyl sulfate (SIDS), the compact multilamellar vesicles disappear and the viscosity decreases. By adding oly(diallyldimethylammonium chloride) (PDADMAC) to the lecithin/SDS system, the formation of multilamellar vesicles can be induced again and the viscosity increases. However, one characteristic feature of these polymer-modified systems is a temperature-dependent phase transition from a compact multilamellar vesicle phase to a more swollen liquid crystalline phase. The polymer-modified multilamellar compact vesicles are of interest for utilization as new thermosensitive drug delivery systems. (C) 2003 Elsevier Inc. All rights reserved
This paper is focused on the synthesis and characterization of hydrophobically modified polyelectrolytes and their use as reducing as well as stabilizing agents for the formation of gold nanoparticles. Commercially available poly(acrylic acid) has been hydrophobically modified with various degrees of grafting of butylamine introduced randomly along the chain. Different analytical methods are performed, i.e., IR and H-1-NMR spectroscopy in combination with elemental analysis to determine the degree of grafting. The modified polymers can successfully be used for the controlled single-step synthesis and stabilization of gold nanoparticles. The process of nanoparticle formation is investigated by means of UV-vis spectroscopy. The size and shape of the particles obtained in the presence of unmodified or modified polyelectrolytes are characterized by dynamic light scattering, zeta potential measurements and transmission electron microscopy. The polyelectrolytes were involved in the crystallization process of the nanoparticles, and in the presence of hydrophobic microdomains at the particle surface, a better stabilization at higher temperature can be observed
Metal ion induced self-assembly of the rigid ligand 1,4-bis(2,2':6',2 ''-terpyridine- 4'-yl) benzene (1) with Fe(II), Co(II), Ni(II) and Zn(II) acetate in aqueous solution results in extended, rigid- rod like metallosupramolecular coordination polyelectrolytes (MEPE-1). Under the current experimental conditions the molar masses range from 1000 g mol(-1) up to 500 000 g mol(-1). The molar mass depends on concentration, stoichiometry, metal-ion and time. In addition, we present viscosity measurements, small angle neutron scattering and AFM data. We introduce a protocol to precisely control the stoichiometry during self-assembly using conductometry. The protocol can be used with different terpyridine ligands and the above-mentioned metal ions and is of paramount importance to obtain meaningful and reproducible results. As a control experiment we studied the mononuclear 4'- (phenyl)2,2':6',2 ''-terpyridine (3) complex with Ni(II) and Zn(II) and the flexible ligand 1,3- bis[4'-oxa(2,2': 6',2 ''-terpyridinyl)] propane (2) with Ni(II) acetate (Ni-MEPE-2). This ligand does not form extended macroassemblies but likely ring-like structures with 3 to 4 repeat units. Through spin- coating of Ni-MEPE-1 on a solid surface we can image the MEPEs in real space by AFM. SANS measurements of Fe-MEPE-1 verify the extended rigid-rod type structure of the MEPEs in aqueous solution.
Metal-ion-induced self-assembly in aqueous solution of the rigid ligand 1,4-bis(2,2':6',2 ''-terpyridine-4'-yl)benzene (1) with Fe(OAc)(2) and Ni(OAc)(2) is investigated with viscosimetry, SANS, and AFM. Ligand 1 forms extended, rigid-rod like metallo-supramolecular coordination polyeectrolytes (MEPEs) with a molar mass of up to 200 000 g mol(-1) under the Current experimental conditions. The molar mass depends oil concentration, stoichiometry, and time. By spin-coating MEPEs oil a solid surface, we call image the MEPEs in real space by AFM. Both AFM and SANS confirm the extended rigid-rod-type structure of the MEPEs. As a control experiment, we also studied the flexible ligand 1,3-bis[4'-oxa(2,2':6',2 ''-terpyridinyl)]propane (2). Ligand 2 does not form extended macro-assemblies but likely ringlike structures with three 10 four repeat units. Finally, we present it protocol to control the stoichiometry during self-assembly using conductometry, which is of paramount importance to obtain meaningful and reproducible results.
The influence of the water soluble polymer poly(ethylene glycol) (PEG) on structure formation in the quasiternary system sodium dodecylsulfate (SDS)/pentanol-xylene/water was checked by means of conductometry, rheology, and micro differential calorimetry. The polymer induces the formation of an isotropic phase channel between the o/w and w/o microemulsion. The transition from the normal as well as from the inverse micellar to the bicontinuous phase range can be detected by conductometry, rheology as well as micro-DSC. As a result of polymer-surfactant interactions, the spontaneous curvature of the surfactant film is changed and a sponge phase is formed. The bicontinuous phase is characterized by a moderate shear viscosity, a Newtonian flow behaviour, and the disappearence of interphasal water in the heating curve of the micro-DSC. When the polymer-modified bicontinuous phase is used as a template phase for the nanoparticle formation, spherical BaSO4 nanoparticles were formed. During the following solvent evaporation process the primarily formed spherical nanoparticles aggregate to nanorods and triangular structures due to the non-restriction of the bicontinuous template phase in longitudinal direction