We study the problem of a single ideal polymer chain tethered to a surface at the midpoint of a repulsive potential stripe. If the potential is very weak, the chain remains unperturbed. However, as the potential is increased, the chain conformation undergoes a sudden change. The chain forms a tether to the edge of the stripe and moves most of the monomers off to the region of lower potential. T...

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We report here the photophysical properties of a water-soluble conjugated polythiophene with cationic side-chains. When dissolved in aqueous buffer solution (PBS, phosphate buffered saline), there is ordering of the polymer chains due to the presence of the salts, in contrast to pure water, where a random-coil conformation is adopted at room temperature. The ordering leads to a pronounced colou...

Poly(ionic liquid)s (PILs), similar to their ionic liquid (IL) analogues, present a nanostructure arising from local interactions. The influence of this on the macromolecular conformation polymer chains is investigated for first time by means an extensive use small angle neutron scattering series poly(1-vinyl-3-alkylimidazolium)s with varying alkyl side-chain length and counter-anion both in bu...

2014 We study the conformation of a linear polymer chain A in a melt of linear polymeric chains B of a different chemical species in the temperature domain where A and B chains are incompatible. We are lead to a strong contraction of the A chain similar to the usual collapse of a single chain in a poor solvent. However, the transition between the ideal and the collapsed state of the coils is mo...

Here, we demonstrate the first successful isotope labeling of Ala carbons in hornet silk produced by the larvae of Vespa (Vespinae, Vespidae) mandarinia. This labeled hornet silk was examined by high-resolution 13C solid-state NMR, and it was found that the fraction of Ala residues in a-helical conformations compared with Ala residues in the overall conformation of hornet silk can be quantitati...

Polymer-induced drag reduction is the phenomenon by which the friction factor of a turbulent flow is reduced by the addition of small amounts of high-molecular-weight linear polymers, which conformation in solution at rest can vary between randomly coiled and rodlike. It is well known that drag reduction is positively correlated to viscous stresses, which are generated by extended polymers. Rod...

Proteins are the basis of organic life on the Earth. These macromolecules appear as polymer chains comprising ∼70 to more than 500 residues (amino acids) of 20 different monomer types. In nature such chains fold into certain 3-dimensional structures (see example in Fig.1). The distinct property of proteins (which distinguishes them from other polymers) is that all molecules with the same order ...

The three-dimensional structure of chitosan/HI type I salt was determined by the X-ray fiber diffraction technique and linked-atom least-squares refinement method. Two polymer chains and four iodide ions (I(-)) crystallized in a monoclinic unit cell with dimensions a = 9.46(2), b = 9.79(2)], c (fiber axis)=10.33(2)A, beta = 105.2(2) degrees and a space group P2(1). Chitosan chains adopted an ex...