Monolayer behavior of a pyridyl head-group-containing amphiphile and its miscibility with poly(d,l-lactide-co-glycolide) on different pH subphase.

Monolayer behavior of a pyridyl head-group-containing amphiphile and its miscibility with poly(d,l-lactide-co-glycolide) on different pH subphase. Research Abstract Details 

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Monolayer behavior of a pyridyl head-group-containing amphiphile and its miscibility with poly(d,l-lactide-co-glycolide) on different pH subphase. Abstract Text:

Miao Xu,Lu Sun,Shengyan Yin,Chunli Liu,Lixin Wu,Miao Xu,Lu Sun,Shengyan Yin,Chunli Liu,Lixin Wu,Miao Xu,Lu Sun,Shengyan Yin,Chunli Liu,Lixin Wu,

In this paper, we investigated the Langmuir film and Langmuir-Blodgett (LB) monolayer film of a nonionic amphiphilic molecule, 4-(6-p-pyridyloxyl)hexyloxyl-4'-dodecyloxylazobenzene (C(12)AzoC(6)Py) and its mixture with poly(d,l-lactide-co-glycolide) (PLG) at different subphase pH values (2.0, 2.6, 3.3, 4.4, and 6.5, respectively) by surface pressure-area (pi-A) isotherms, in situ interface Brewster angle microscopy (BAM), and ex situ atomic force microscopy (AFM). For pure C(12)AzoC(6)Py, its pi-A isotherms display a plateau when the subphase pH value is lower than 3.0. The pressure of the plateau increases with the decrease of pH until 2.0. Over the plateau, the pi-A isotherms become almost identical to the one under neutral conditions. The appearance of such a plateau can be explained as the coexistence of protonation and unprotonation of pyridyl head groups of the employed amphiphile. In contrast to the homogeneous surface morphology of pure C(12)AzoC(6)Py near the plateau by BAM observation, the surface in the case of its mixing with PLG exhibits a dendritic crystalline state under low surface pressure at subphase pH lower than 3.0. The crystalline state becomes soft and gradually melts into homogeneous aggregates with surface pressure increasing to a higher value than that of the plateau. Meanwhile, the hydrolysis of PLG in the mixture system at the interface has been affirmed to be restrained to a very large extent. And the PLG was believed to be compelled to the up layer of the LB film due to the phase separation, which is examined by AFM. Based on the experimental results, the corresponding discussion was also performed.

Monolayer behavior of a pyridyl head-group-containing amphiphile and its miscibility with poly(d,l-lactide-co-glycolide) on different pH subphase. Publishing Authors By Initials

M Xu,L Sun,S Yin,C Liu,L Wu,M Xu,L Sun,S Yin,C Liu,L Wu,M Xu,L Sun,S Yin,C Liu,L Wu,

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Monolayer behavior of a pyridyl head-group-containing amphiphile and its miscibility with poly(d,l-lactide-co-glycolide) on different pH subphase. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of colloid and interface science

VOLUME: 316

Page Numbers: 912-20

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ISSN: 0021-9797

DAY: 19

MONTH: 09

YEAR: 2007

Monolayer behavior of a pyridyl head-group-containing amphiphile and its miscibility with poly(d,l-lactide-co-glycolide) on different pH subphase. Information

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LANGUAGE: eng

NlmUniqueID: 43125

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Grant and Affiliation Information for Monolayer behavior of a pyridyl head-group-containing amphiphile and its miscibility with poly(d,l-lactide-co-glycolide) on different pH subphase.

AFFILIATION: Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China.

Country: United States

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MEDLINETA: J Colloid Interface Sci

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