期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 42, 页码 23483-23489出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c07173
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资金
- JSPS KAKENHI [18H01934, 18K14176]
- Grants-in-Aid for Scientific Research [18H01934, 18K14176] Funding Source: KAKEN
In this study, the presence of weakly hydrogen-bonded water molecules buried in the hydrophobic moiety of charged lipids at aqueous interfaces was confirmed using heterodyne-detected sum frequency generation (HD-SFG) spectra. The chi((3)) contribution was successfully subtracted from the observable, allowing the reconfirmation of the weakly hydrogen-bonded water molecules in the hydrophobic moiety.
The presence/absence of weakly hydrogen-bonded water molecules buried in the hydrophobic moiety of charged lipids at aqueous interfaces has been a matter of debate. We concluded their presence in our previous study, which was later questioned from the viewpoint of the so-called chi((3)) effect. Here we show that heterodyne-detected sum frequency generation (HD-SFG) spectra of the same lipid interfaces with excess salt in the aqueous subphase allow us to reconfirm the presence of the weakly hydrogen-bonded water in the hydrophobic moiety after successfully subtracting the chi((3)) contribution from the observable.
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