Structural Characterization of Thin Hydroxypropylcellulose Films. X-ray Reflectivity Studies

Thin solid films of hydroxypropylcellulose (HPC) have been investigated using synchrotron X-ray reflectivity. Evidence of preferential alignment of HPC molecules at the substrate surface is obtained. In the surface region the liquid crystalline domains of HPC are preferentially oriented parallel to...

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Bibliographic Details
Published in:Langmuir 2004-03, Vol.20 (5), p.1698-1703
Main Authors: Evmenenko, G., Yu, C.-J., Kewalramani, S., Dutta, P.
Format: Article
Language:English
Subjects:
Carbohydrate Conformation
Cellulose - analogs & derivatives
Cellulose - chemistry
MATERIALS SCIENCE
MORPHOLOGY
NATIONAL SYNCHROTRON LIGHT SOURCE
POLYSACCHARIDES
REFLECTIVITY
Synchrotrons
THIN FILMS
X RADIATION
X-Rays
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Summary:Thin solid films of hydroxypropylcellulose (HPC) have been investigated using synchrotron X-ray reflectivity. Evidence of preferential alignment of HPC molecules at the substrate surface is obtained. In the surface region the liquid crystalline domains of HPC are preferentially oriented parallel to the substrate, whereas in the bulk they are mostly distributed randomly. Incorporation of colloidal particles in the film−substrate region destroys the preferential alignment. It is also found that in conditions of restricted geometry (very thin films), a minimum film thickness is required to produce lateral packing order perpendicular to the substrate surface.
ISSN:0743-7463
1520-5827
DOI:10.1021/la035118i