Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and quasi-elastic neutron scattering (QENS) measurements have been made at 200~330 K for capillary-condensed water confined in periodic mesoporous organosilica (PMO) materials with the phenyl groups embedded in silica matrix (Ph-PMO; pore diameter 30 Å). The DSC data showed that the capillary-condensed water in Ph-PMO freezes at 228 K. X-ray radial distribution functions (RDFs) showed that the tetrahedral-like hydrogen-bonded structure of water is distorted in Ph-PMO pores, compared with bulk water; however, with lowering temperature the tetrahedral moiety of water is gradually recovered in the pores. Below the freezing point, cubic ice Ic was formed in the Ph-PMO pores. The QENS data showed that the translational diffusion constant and the residence time and the rotational relaxation time of water molecule in Ph-PMO are comparable with those in bulk. The corresponding activation energies suggested that the more hydrophobic the nature of the wall is, the smaller the activation energy of diffusion and rotation of a water molecule; this implies that water molecules confined in the hydrophobic pores are present in the core of the pores, whereas those in the hydrophilic pores strongly interact with the silanol groups.
Conference
International Conference on Solution Chemistry (ICSC-32), International Conference on Solution Chemistry, ICSC, Solution Chemistry, 32nd, La Grande Motte, France, 2011-08-28–2011-09-02
References
1 10.1021/jp9631238, T. Takamuku, M. Yamaguchi, H. Wakita, Y. Masuda, T. Yamaguchi. J. Phys. Chem. B101, 5730 (1997).Search in Google Scholar
2 10.1103/PhysRevLett.85.3644, M.-C. Bellissent-Funel, S. Longeville, J.-M. Zanotti, S.-H. Chen. Phys. Rev. Lett.85, 3644 (2000).Search in Google Scholar PubMed
3 10.1021/ja00053a020, J. S. Beck, J. C. Vartulli, W. J. Roth, M. E. Leonovicz, C. T. Kresger, K. D. Schmitt, C. T.-W. Chu, D. H. Olson, E. W. Sheppard, S. B. McCullen, J. B. Higgins, J. L. Schlenker. J. Am. Chem. Soc.114, 10834 (1992).Search in Google Scholar
4 10.1021/jp984136j, S. Takahara, M. Nakano, S. Kittaka, Y. Kuroda, T. Mori, H. Hamano, T. Yamaguchi. J. Phys. Chem. B103, 5814 (1999).Search in Google Scholar
5 10.1021/jp994326+, P. Smirnov, T. Yamaguchi, S. Kittaka, S. Takahara, Y. Kuroda. J. Phys. Chem. B104, 5498 (2000).Search in Google Scholar
6 10.1021/jp046036l, S. Takahara, N. Sumiyama, S. Kittaka, T. Yamaguchi, M.-C. Bellissent-Funel. J. Phys. Chem. B109, 1231 (2005).Search in Google Scholar PubMed
7 10.1063/1.2961029, K. Yoshida, T. Yamaguchi, S. Kittaka, M.-C. Bellissent-Funel, P. Fouquet. J. Chem. Phys.129, 054702 (2008).Search in Google Scholar PubMed
8 10.1016/j.molliq.2006.08.003, T. Yamaguchi, H. Hashi, S. Kittaka. J. Mol. Liq.129, 57 (2006).Search in Google Scholar
9 10.1143/JPSJ.71.2863, Y. Maniwa, H. Kataura, M. Abe, S. Suzuki, Y. Achiba, H. Kira, K. Matsuda. J. Phys. Soc. Jpn.71, 2863 (2002).Search in Google Scholar
10 10.1016/j.susc.2008.10.035, E. Levy, A. I. Kolesnikov, J. Li, Y. Mastai. Surf. Sci.603, 71 (2009).Search in Google Scholar
11 10.1038/416304a, S. Inagaki, S. Guan, T. Ohsuna, O. Terasaki. Nature416, 304 (2002).Search in Google Scholar
12 10.1021/jp2029467, T. Yamada, R. Yonamine, T. Yamada, H. Kitagawa, M. Tyagi, M. Nagao, O. Yamamuro. J. Phys. Chem. B115, 13563 (2011).Search in Google Scholar
13 10.1021/ja01864a025, S. Brunauer, L. S. Deming, W. E. Deming, E. Teller. J. Am. Chem. Soc.62, 1723 (1940).Search in Google Scholar
14 10.1063/1.467948, K. Yamanaka, T. Yamaguchi, H. Wakita. J. Chem. Phys.101, 9830 (1994).Search in Google Scholar
15 10.1088/0034-4885/25/1/310, K. Furukawa. Rep. Prog. Phys.25, 395 (1973).Search in Google Scholar
16 10.1107/S0365110X56002655, J. Krogh-Moe. Acta Crystallogr.9, 951 (1956).Search in Google Scholar
17 10.1107/S0365110X57001085, N. Norman. Acta Crystallogr.10, 370 (1957).Search in Google Scholar
18 G. Johansson, M. Sandström. Chem. Scr.4, 195 (1973).Search in Google Scholar
19 10.1016/0921-4526(95)00308-V, T. Kajitani, K. Shibata, S. Ikeda, M. Kohgi, H. Yoshizawa, K. Nemoto, K. Suzuki. Physica B213–214, 872 (1995).Search in Google Scholar
20 J. C. Dore, M. Dunn, P. Chieux. J. Phys. Coll. C1 Suppl. 3, 48, 457 (1987).Search in Google Scholar
21 T. Yamaguchi. Doctoral Thesis, Tokyo Institute of Technology (1978).Search in Google Scholar
22 10.1103/PhysRevA.31.1913, J. Teixeira, M.-C. Bellissent-Funel, S. H. Chen, A. J. Dianoux. Phys. Rev. A31, 1913 (1985).Search in Google Scholar PubMed
© 2013 Walter de Gruyter GmbH, Berlin/Boston
