PubMed · 16196227
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John L Guinta. 2005. 'A simpler technique'.. https://doi.org/10.14219/jada.archive.2005.0330
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Nanotubes of poly(4-vinylpyridine) (PVP) and poly(acrylic acid) (PAA) were fabricated by hydrogen bonding based on layer-by-layer (LbL) assembly. The uniform and flexible tubular structures were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). FTIR and X-ray photoelectron spectroscopy (XPS) measurements confirm the formation of hydrogen bonds in the assembled nanotubes. PAA can be released from the assembled PAA/PVP nanotubes in a basic aqueous solution to give the walls of the tubes a porous structure. Such assembled nanotubes can be considered as carriers for catalysts or drugs, especially in aqueous solution against capillary force.
Polyacrylamide-metal (M = Pt, Ag, Cu) nanocomposites with metal nanoparticles homogeneously dispersed in the polymer matrix have been successfully prepared with the corresponding metal salt and acrylamide monomer in ethylene glycol by microwave heating. This method is based on the single-step simultaneous formation of metal nanoparticles and polymerization of the acrylamide monomer, leading to a homogeneous distribution of metal nanoparticles in the polyacrylamide matrix. Ethylene glycol acts as both a reducing reagent and a solvent, thus no additional reductant is needed. Another advantage is that no initiator for AM polymerization and no surfactant for stabilization of metal nanoparticles are necessary. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), ultraviolet visible (UV-vis) absorption spectra, and thermogravimetric (TG) and differential scanning calorimetric analysis (DSC).
The reversible addition-fragmentation chain-transfer polymerization was used to prepare microarray slides grafted with polymer brushes for DNA-based applications. Block copolymer brushes of N,N-dimethylacrylamide (DMA) and glycidyl methacrylate (GMA), poly(DMA-b-GMA) were prepared by extending living poly(dimethylacrylamide) chains. The functional surface was used as a substrate for oligonucleotide hybridization experiments. The results were compared to those provided by glass slides coated by a self-assembled monolayer made of (3-glycidyloxypropyl)trimethoxysilane. Surfaces coated with block polymer brushes bearing oxirane groups are more efficient as substrates for oligonucleotide hybridization than surfaces coated with nonpolymeric self-assembled monolayers containing the same functional group. The high probe grafting density and hybridization efficiency achieved with this polymeric coating reveal the importance of the block architecture to ensure good accessibility of the immobilized probe. The new surface was characterized by static angle measurements and diffuse reflectance FT-IR spectroscopy on a silica model system.