123 research outputs found
Dipping-Induced Azimuthal Helix Orientation in Langmuir-Blodgett Monolayers of α-Helical Amphiphilic Diblock Copolypeptides
The azimuthal helix orientation of the rigid-rod amphiphilic diblock copolypeptides (PLGA-b-PMLGSLGs) of poly(α-L-glutamic acid) (PLGA) and poly(γ-methyl-L-glutamate-ran-γ-stearyl-L-glutamate) with 30 mol % of stearyl substituents (PMLGSLG) in Langmuir-Blodgett (LB) monolayers was investigated using polarized transmission Fourier transform infrared spectroscopy. The relative position of dipping with respect to the previous transfer position can be used to manipulate the azimuthal orientation of the helices parallel to or tilted by an angle of 45° with respect to the dipping direction in the transferred films. The study of the azimuthal order for the LB monolayers of PLGA-b-PMLGSLGs of various block lengths revealed that the observed effect arises mainly from the deformation of the PMLGSLG top brush layer, induced by the flow orientation around the transfer region. In those cases where the PMLGSLG block is tilted by a sufficiently large angle with respect to the surface normal, high azimuthal order parameters of 0.5-0.75 were obtained.
New silicon hydrogen infrared vibrational band associated to HSiCl configurations in an amorphous silicon matrix : Green's function theory approach
Cytokine mRNA Profile of Myelin Basic Protein Reactive T-cell Clones in Patients with Multiple Sclerosis
Raman scattering and local force variations due to transition-element impurities in zinc-sulfide crystals: Effect of pressure application
A screening assay for Selective Dimerizing Glucocorticoid Receptor Agonists and Modulators (SEDIGRAM) that are effective against acute inflammation
Structure and Photoisomerization of the Z-Type Langmuir−Blodgett Films of a New Series of Azo-Containing Chiral Copolymers
Quasi One-Dimensional Spin System in Langmuir-Blodgett Films of a Charge-Transfer Complex
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