Two Dimensional Aggregation Behaviors of Quinoxaline Dendrimers.
J Nanosci Nanotechnol
; 15(2): 1511-4, 2015 Feb.
Article
em En
| MEDLINE
| ID: mdl-26353682
ABSTRACT
This study focuses on the molecular behavior of two dendrimers containing a hydrophilic core group (carboxyl group) and hydrophobic branches (quinoxaline and methoxyphenyl groups), 2,3-bis(4-(2,3- bis(4-methoxyphenyl)quinoxalin-6-yloxy)phenyl)quinoxaline-6-carb-oxylic acid (G2) and 2,3-bis(4-(2,3-bis(4-(2,3-bis(4-methoxyphenyl)quinoxalin-6-yloxy)phe-nyl)quinoxalin-6-y-oxy)phenyl) quin oxaline-6-carboxylic acid (G3) at the air-water interface. To understand the mechanism of the self-assembly of these molecules, we measured the surface pressure-area (III-A) isotherm and investigated the surface morphology of Langmuir-Blodgett films transferred onto hydrophilic silicon wafers using atomic force microscopy (AFM). Upon compression, G2 molecules stand up and steadily make close-packed monolayer whereas G3 molecules form circular domains and gradually make aggregates of domains. These results were confirmed by the X-ray Reflectivity (XRR) profiles of G2 and G3 monolayers transferred onto silicon substrates.
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Base de dados:
MEDLINE
Assunto principal:
Quinoxalinas
/
Tensoativos
/
Água
/
Dendrímeros
/
Nanopartículas
Idioma:
En
Revista:
J Nanosci Nanotechnol
Ano de publicação:
2015
Tipo de documento:
Article