Structure of poly(γ-benzyl-L-glutamate) monolayers at the gas–water interface: A Brewster angle microscopy and x-ray scattering study | Zendy

Masafumi Fukuto | Zendy; Ralf K. Heilmann | Zendy; P. S. Pershan | Zendy; S. Michael Yu | Zendy; Jennifer Griffiths | Zendy; David A. Tirrell | Zendy

Open Access

Structure of poly(γ-benzyl-L-glutamate) monolayers at the gas–water interface: A Brewster angle microscopy and x-ray scattering study

Author(s) -

Masafumi Fukuto,

Ralf K. Heilmann,

P. S. Pershan,

S. Michael Yu,

Jennifer Griffiths,

David A. Tirrell

Publication year - 1999

Publication title -

the journal of chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.071

H-Index - 357

eISSN - 1089-7690

pISSN - 0021-9606

DOI - 10.1063/1.480312

Subject(s) - monolayer , brewster's angle , specular reflection , scattering , surface pressure , monomer , chemistry , langmuir , x ray reflectivity , materials science , crystallography , analytical chemistry (journal) , optics , thin film , nanotechnology , brewster , organic chemistry , polymer , adsorption , physics , mechanics

This paper reports Brewster angle microscopy (BAM), x-ray specular reflectivity (XR), grazing incidence diffraction(GID) and off-specular diffuse scattering (XOSDS) measurements of Langmuir monolayers formed on water by both mono- and polydisperse samples of α-helical poly(γ-benzyl L-glutamate) (PBLG) as a function of area/monomer A. The microscopic behavior does not exhibit any discernible effects due to differing dispersity. At low surface densities (A>∼21A^2/monomer,surface pressure Π=0), BAM images reveal partial surface coverage by solidlike monolayer islands. GID measurements show an interhelix peak corresponding to a local parallel alignment of rodlike PBLG molecules, indicating their tendency to aggregate laterally without external pressure. Compression to A<21A^2/monomer first leads to full and uniform surface coverage by the monolayer, followed by a steep rise in Π that is accompanied by a decrease in the interhelix distance. Further compression results in a plateau of constant Π in the Π-A isotherm (∼11.5

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