Effect of nano-confinement on the structure and properties of water clusters: An ab initio study

被引:11
作者
Tripathy, Manoj K. [1 ,2 ]
Mahawar, Devendra K. [3 ]
Chandrakumar, K. R. S. [2 ,4 ]
机构
[1] Bhabha Atom Res Ctr, Res Reactor Serv Div, Mumbai 400085, Maharashtra, India
[2] Homi Bhabha Natl Inst, Mumbai 400094, Maharashtra, India
[3] Univ Rajasthan, Dept Chem, Jaipur 302004, Rajasthan, India
[4] Bhabha Atom Res Ctr, Theoret Chem Sect, Mumbai 400085, Maharashtra, India
关键词
Nanoconfinement; Water clusters; Carbon nanotubes; Density functional theory; WALLED CARBON NANOTUBES; DISORDERED WATER; INFRARED-SPECTRA; PHASE-TRANSITION; PROTON-TRANSFER; HYDROGEN-BONDS; ICE NANOTUBES; TRANSPORT; DYNAMICS; ION;
D O I
10.1007/s12039-019-1697-3
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
An ab initio investigation on water clusters confined to armchair carbon nanotubes (CNT) with varying diameters has been performed using the density functional theory-based calculations. Different parameters have been investigated including structure, hydrogen bonding pattern and vibrational spectra of water-CNT complexes. Our results reveal that one-dimensional water chain parallel to CNT axis is formed in narrow nanotubes CNT(4,4) and CNT(5,5), whereas in CNT(6,6), zigzag structure is observed. An increase in the CNT diameter results in more symmetric structures similar to the gas phase. The vibrational analysis shows a redshift in stretching frequency of the hydrogen bond assisted O-H in CNT(6,6) due to the reduction in O-O separation whereas a significant blue shift in stretching frequency mode is observed in highly confined CNT(4,4) and CNT(5,5). It implies that the hydrogen bond strength between water molecules is strongest in CNT(6,6). It is also observed that water cluster tends to be near CNT wall due to H center dot center dot center dot pi interaction between water molecule and the p-electron cloud of CNT. An inverse relation between the electronic charge transfer (from CNT to water) and the diameter is also established. This study demonstrates that the degree of confinement is extremely important in deciding the properties of confined water molecules.
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页数:11
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