Microscopic Surface Patterns of a Liquid Crystalline Polyacrylate Film

Sentenac, D.; Ostrovskiǐ, B. I.; Jeu, Wim H. de

doi:10.1002/1521-4095(200107)13:14<1079::aid-adma1079>3.0.co;2-4

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…The fiberlike nanostructures in QP monolayers resemble those reported in LB monolayers of esters of dihydroxy fatty acids . Also, discrete fiberlike structures have been observed by the hierarchical self-assembling of azobenzene compounds and crystalline polyacrylate films deposited by spin coating . In the above cases, the fiber lateral size was supposed to be the result of the compact and discrete lateral aggregation of few molecules.…”

Section: Resultssupporting

confidence: 58%

“…13 Also, discrete fiberlike structures have been observed by the hierarchical self-assembling of azobenzene compounds 14 and crystalline polyacrylate films deposited by spin coating. 15 In the above cases, the fiber lateral size was supposed to be the result of the compact and discrete lateral aggregation of few molecules. In our case, by assuming the QP average molecular diameter (0.74 nm) evaluated at the air/water interface and the deconvoluted fiber lateral size (5 nm), one fiber can be evaluated to correspond to about six QP self-assembled molecules.…”

Section: Resultsmentioning

confidence: 99%

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Self-Organizing Fiberlike Nanostructures and Wrapping-Up Processes in Langmuir−Blodgett Films

2003

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Fiberlike supramolecular structures, almost monodisperse in diameter (14 ± 2 nm), were obtained in quercetin-3-O-palmitate (QP) Langmuir−Blodgett monolayers transferred on solid substrates by working at a relatively high subphase temperature (37 °C) and surface pressure (30 mN/m). The formation of QP fiberlike structures of similar diameter was also reached by exploiting phase separation processes occurring in mixed monolayers of dimyristoylphosphatidylcholine and QP at 10 °C. In the mixed films, the nanoscopic fibers were observed to curve and wrap up, leading to novel spirallike domains. The wrapping-up process was observed to be enhanced either by lowering the barrier compression speed at the air/water interface or by heating the solid support at the air/solid interface. The above phenomena were observed by scanning probe microscopy of the transferred monolayers. By employment of different operative modes including tapping, phase, friction, and the dynamic attractive regime, important insights on the phase separation as well as the mechanical properties of the nanostructures were found.

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Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Self-Organizing Fiberlike Nanostructures and Wrapping-Up Processes in Langmuir−Blodgett Films

2003

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“…The hierarchical self-assembling of azobenzene compounds 48 and crystalline polyacrylate films deposited by spin coating are examples of self-association of anisotropic molecules leading to discrete fiber-like structures. 49 Fiber-forming discotic molecules have also been found to form complex supra-structures. Indeed, these systems may grow with both tangential and radial arrangement of the fibers, and this can, respectively, generate supra-structures of different shapes like the compact and holed ones.…”

Section: Equilibrium Systemsmentioning

confidence: 99%

Nanostructured molecular surfaces: advances in investigation and patterning tools

Pignataro

2009

J. Mater. Chem.

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This feature article is aimed to showcase advanced soft and radiationless nanotools for the morphological characterization and for the preparation/modification of molecular surfaces, namely solid supported ultrathin films not exceeding 1-2 molecular layers. As to the characterization, the development of dynamic scanning force microscopy in attractive regime is presented as an important progress at least as far as it concerns imaging of nanoscale features of molecular surfaces with minimal probe-sample physical interaction. To date, this tool has been applied only by a few groups in spite of its larger resolution and image quality than the conventional scanning probe methods. As to the preparation/modification, the realization of ultrathin nanoscale patterns is reviewed by highlighting at first some recent approaches in the field of molecular self-assembly on solid substrates including the possibility to induce order under both equilibrium and non-equilibrium conditions. Secondly, the area of nanoscale man-made fabrication is featured by choosing some of those techniques of urgent need (high resolution, low cost, potentially of simple use) like scanning probe lithographies and nanodispensing tools. Scheme 1 Schematic picture representing the central role played by molecular ultrathin films in different research fields.

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Microscopic Surface Patterns of a Liquid Crystalline Polyacrylate Film

Cited by 2 publications

References 9 publications

Self-Organizing Fiberlike Nanostructures and Wrapping-Up Processes in Langmuir−Blodgett Films

Self-Organizing Fiberlike Nanostructures and Wrapping-Up Processes in Langmuir−Blodgett Films

Nanostructured molecular surfaces: advances in investigation and patterning tools

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