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231223s2007 xx ||||| 00| ||eng c |
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|e rakwb
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|a eng
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| 100 |
1 |
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|a Lin, Jiang-Jen
|e verfasserin
|4 aut
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|a Formation of hierarchical molecular assemblies from poly(oxypropylene)-segmented amido acids under AFM tapping
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|c 2007
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|b nc
|2 rdacarrier
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|a Date Completed 27.06.2007
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|a Date Revised 03.04.2007
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Molecular self-aligning of amphiphilic molecules into bundles with a constant width of 7-13 nm was observed under tapping-mode atomic force microscopy (TM-AFM). The requisite amphiphile, a poly(oxypropylene)-trimellitic amido acid sodium salt, is constituted of a symmetric amido acid structure with potential noncovalent forces of ionic charges, hydrogen bonds, pi-pi aromatic stacking, and hydrophobic interactions for intermolecular interaction. The amphiphiles are able to self-align into orderly hierarchical assemblies after simply being dissolved in water and dried under spin-coated evaporation. Under the TM-AFM tapping process, the bundles increased their length from an initial 20 to 600 nm. A sequential TM-AFM scanning and interval heating process was designed to probe the morphological transformations from the molecular bundles to lengthy strips (nearly micrometer scale) and to columns (with 5-7 nm spacing between the parallel strips). The formation of hierarchical arrays via molecular stretching, aligning, and connecting to each other was simultaneously observed and accelerated under the TM-AFM vibration energy. The molecular self-alignment caused by vibrations is envisioned to be a potential methodology for manipulating molecules into assembled templates, sensors, and optoelectronic devices
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Macromolecular Substances
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|a Polypropylenes
|2 NLM
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|a Tsai, Wei-Cheng
|e verfasserin
|4 aut
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|a Wang, Chi-He
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 23(2007), 8 vom: 10. Apr., Seite 4108-11
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|x 1520-5827
|7 nnns
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|g volume:23
|g year:2007
|g number:8
|g day:10
|g month:04
|g pages:4108-11
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