Probing the microenvironment of unimicelles constituted of amphiphilic hyperbranched polyethyleneimine using 1-methyl-8-oxyquinolinium betaine

Literature Information

Publication Date 2014-05-19
DOI 10.1039/C4CP01333F
Impact Factor 3.676
Authors

Agustín S. Picco, Gustavo F. Silbestri, R. Darío Falcone, Omar Azzaroni, Marcelo Ceolín, N. Mariano Correa


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Abstract

In this work, the microenvironment of the core of different unimicelles of hyperbranched polyethyleneimine (HPEI) capped with different aliphatic chains (stearate, palmitate, and laurate) dissolved in toluene has been investigated. To achieve this goal we have used 1-methyl-8-oxyquinolinium betaine (QB) as a molecular probe due to its solvatochromic behavior to monitor the micropolarity and hydrogen bond donor ability of the unimicelle cores. QB shows that the micropolarity and the hydrogen bond donor capability of the polar core of reverse unimicellar media are very different than toluene and similar to the one obtained with traditional surfactants that form reverse micellar media but at a very low unimicelle concentration. Particularly, our results show that the hydrogen bonding ability of the core is the driving force for QB to partition toward the unimicellar media.

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Back cover

Cover

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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