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第２回ＣＯＥ(自己組織系物理)セミナー ［通算第2回］
| What can be Learnt from Dielectric Spectroscopy on Hydration and Association Phenomena |
| 日 時 |
2003年11月14日（金） 2:40〜4:20 |
| 場 所 |
早稲田大学理工学部大久保キャンパス55号館1Ｆ第一会議室 [地図] |
| 講 師 |
Richard Buchner 博士
Institut fur Physikalische und Theoretische Chemie, Universitat
Regensburg,
93040 Regensburg, Germany. |
| 要 旨 |
Decisive for the intriguing properties
of aqueous solutions is the intricate balance between solvent-solvent,
solvent-solute and solute-solute interactions which can be
phrased by the catchwords hydrophilic and hydrophobic hydration.
These phenomena originate in the ability of water molecules
to form strong inter-molecular hydrogen bonds which gives
rise to co-operative relaxation processes and is able to
trigger structure formation and self-association of solute
molecules to supra-molecular aggregates.
The aim of this lecture is to show what information on the
hydration and association of solute molecules can be obtained
from precise quantitative dielectric relaxation experiments.
After a brief introduction into the dielectric relaxation of
pure water, examples for hydrophilic and hydrophobic hydration
as well as for solute association driven by Coulomb forces
and hydrophobic interactions will be discussed. Aqueous electrolytes
as well as micelles and micro-emulsions will be considered.
It will be shown that the quantitative information obtained
for these systems with dielectric spectroscopy not only can
be linked to knowledge acquired with other techniques but also
provides novel insight which is not accessible otherwise.
親水性水和、疎水性水和という言葉で表される水溶液中における複雑な分子間相互作用は、水分子間の強力な水素結合形成を本質的な起源とする。水素結合は、水分子の高度な共同運動性を生じさせると共に、溶質分子会合や超分子構造形成の機作となる。
本公演では、上述の親水性、疎水性の水和及び、クーロン力や疎水性相互作用による分子会合、特にイオンペア、ミセル、ミクロエマルション等の超分子構造の形成について、最先端の誘電分光測定を通じた分子ダイナミクスの立場から議論する。 |
| 紹介教員 |
千葉明夫、田崎秀一 |
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