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Self-Assembly of Asymmetric Fan-Shaped Dendrimers with Different Generation Numbers at the Air-Water Interface

Authors
Lee, JisunKim, KyungbaeLee, SongyKim, Hwan KyuSohn, Daewon
Issue Date
4-11월-2008
Publisher
AMER CHEMICAL SOC
Citation
LANGMUIR, v.24, no.21, pp.12426 - 12430
Indexed
SCIE
SCOPUS
Journal Title
LANGMUIR
Volume
24
Number
21
Start Page
12426
End Page
12430
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/122416
DOI
10.1021/la802438n
ISSN
0743-7463
Abstract
Monolayer formation of two dendrimers containing a hydrophilic core group (COOH) and hydrophobic peripheral groups (anthracene and aryl ether tail groups), 4-{10-[4-(3,5-bis-benzyloxy)-phenyl]-anthracen-9-yl}-benzoic acid (G1) and 4-(10-{4-[3,5-bis-(3,5-bis-benzyloxy)-benzyloxyl-phenyl}-anthracen-9-yl)-benzoic acid (G2), were studied. To understand the mechanism of the self-assembly of these molecules, we measured the surface pressure-surface area (Pi-A) isotherm and investigated the surface texture of Langmuir-Blodgett monolayers transferred onto hydrophilic silicon wafers. Both dendrimers form circular domains at the onset point of surface pressure as a result of the difference in hydrophobicity between the core group and the peripheral end group. The core group has a functional group at the end of dendrimer and can be anchored on the water surface. Upon further compression, monolayer of G I shows a domain of molecules whereas a monolayer of G2 is aligned in the direction of compression at 10 mN/m. At higher surface pressure (20 mN/m), G1 molecules have several aggregates of domains, but G2 molecules maintain their ordering. These results were confirmed by the electron density profile of G1 and G2 monolayers transferred to silicon substrates, as measured by X-ray reflectivity.
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