Soft X-ray emission spectroscopy of nanoconfined water

2015 Fiscal Year Final Research Report

• Project/Area Number: 25871131
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry; Quantum beam science
• Research Institution: Yamaguchi University (2015); The Institute of Physical and Chemical Research (2013-2014)
• Principal Investigator: Horikawa Yuka (堀川) 山口大学, 理工学研究科, 助教 (10589039)
• Research Collaborator: TOKUSHIMA Takashi ; SADAKANE Koichiro
• Project Period (FY): 2014-02-01 – 2016-03-31
• Keywords: 軟X線発光分光 / 逆ミセル / 多層膜 / ナノ空間中の水 / 水素結合

Outline of Final Research Achievements

We have investigated the hydrogen bonding states of nano-confined water by using Soft X-ray emission spectroscopy. It is known that XES spectrum of water shows a split of the lone-pair (1b1) peak which has been interpreted as arising from structures with distorted hydrogen bonds (1b1'') and from tetrahedrally hydrogen-bonded structures (1b1'). We found the relative population of 1b1’ peak decreased along with a decrease of the micelle size, that is, the hydrogen bonding of water molecules confined in the reverse micelle becomes weaker than that of bulk water when a diameter of the reverse micelle is around 2 nm.

Free Research Field

軟X線分光