pH mediated kinetics of assembly and disassembly of molecular and nanoscopic building blocks
| Autor: | István Lagzi, Rózsa Szűcs, Gábor Holló, Eszter Tóth-Szeles, Hideyuki Nakanishi, Zsófia Medveczky, Judit Horváth |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Bilayer Kinetics Nanoparticle Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences symbols.namesake Colloidal gold Chemical physics symbols Molecule Self-assembly Physical and Theoretical Chemistry van der Waals force 0210 nano-technology Nanoscopic scale |
| Zdroj: | Reaction Kinetics, Mechanisms and Catalysis. 123:323-333 |
| ISSN: | 1878-5204 1878-5190 |
| DOI: | 10.1007/s11144-017-1312-x |
| Popis: | Self-assembly occurs when building blocks of the system interact with one another through interactions existing between them. Proper temporal control of these interactions can lead to formation of transient self-assembled states. pH mediated self-assembly is one of the powerful tools to stabilize and destabilize structures consisting of different sized building blocks. Here we investigate the kinetics of pH triggered reversible transformation of two building blocks using a relaxation method, reversible vesicle–micelle transformation of oleic acid molecules and dispersion–aggregation of pH sensitive gold nanoparticles. We found significant differences in the characteristic times (two orders of magnitudes) between the disassembly processes—from an ordered structure to a less ordered structure (in the case of oleic acid molecules) or to single building blocks (in the case of nanoparticles)—and the self-assembly processes (bilayer formation or aggregation of nanoparticles). It can be explained by a sophisticated interplay between repulsive (electrostatic) and attractive (van der Waals) interactions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink