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Solvent Istope Effect and Hydrogen Bond Effect on the Selfassembly Process of Macroions
Başlık:
Solvent Istope Effect and Hydrogen Bond Effect on the Selfassembly Process of Macroions
Yazar:
Yidan, Shen, author.
ISBN:
9780438099210
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (51 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: Tianbo Liu Committee members: Toshikazu Miyoshi.
Özet:
Macroions are nanoscale ions which have a unique solution behavior that can self-assembly into 3D, single layer, hollow spherical, vesical-like structure called “blackberry” structure. There is a critical problem that how the like-charged macroions could stay together to form the beautiful structure. Studying the self-assembly process by regulating the dielectric constant of solvent and the charge density of polyoxometalates (POMs), the major driving force of the self-assembly process is the counterion mediate attraction. Similarly, the nano-sized metal-organic nanocages also have the same self-assembly behaviors. Moreover, the self-recognition was found during blackberry formation process of two mixed POMs with different charge densities.
It is intriguing that the solution properties are of great importance on the behaviors of macroions. The solvent isotopic effect may also have great effect on the self-assembly process. Herein, we report the disparity in the assembly behavior of macroions induced by isotopic substitution of Protium (H) to Deuterium (D) in solvent molecules. The assembly rate is slower in D2O than H2O due to the stronger D-bond or higher viscosity in D-solvent. Meanwhile, the assembly sizes of different macroions have different trend. For strong electrolyte such as {SrPd12} and {U60} with alkali metal ions as counterions, they have been demonstrated similar assembly sizes in both solvents; while the weak acid type POMs {Mo72 Fe30} shows unusually larger assembly size in H2O, which comes from the higher degree of deprotonation in H 2O strengthening the hydrogen bond to provide extra attraction between macroions.
Notlar:
School code: 0003
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(696411.1) | 696411-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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