Fig. 1. Schematic of the simulation system for one-dimensional confined water（1DCW） through a single-walled carbon nanotube（SWNT） water channel：In this system，a 2.33 nm long（6，6） SWNT is placed between two perforated graphite sheets，with water reservoirs on either side of the graphite sheets，allowing water molecules to pass through the nanotube only in the Z direction. In the figure，green，red，and white spheres represent carbon（C），oxygen（O），and hydrogen（H） atoms，respectively.

Fig. 2. Infrared spectra of O-H bond stretching vibrations in 1DCW and BW.（a），（b） represent the spectra of O-H bond stretching vibrations in 1DCW and BW； in both spectra，the infrared absorption peaks of the stretching vibrations appear in the frequency（$f$） range of 90-110 THz； the gray curve represents the stretching vibration spectrum between the H₁ atom and the O atom in water molecules（O-H₁），while the red curve represents the stretching vibration spectrum between the H₂ atom and the O atom（O-H₂）

Fig. 3. Changes and distributions of O-H bond lengths over time in 1DCW and BW.（a），（b） Represent the stretching changes of O-H₁ and O-H₂ bond lengths over time in 1DCW and BW，respectively. Insets： the left and right sides respectively represent the stretched states of the two O-H bonds in 1DCW and BW；（c），（d） respectively represent the statistical distribution graphs of O-H₁ and O-H₂ bond lengths in 1DCW and BW，respectively. Herein，where the gray curve represents the distribution of the O-H₁ bond lengths in water molecules，and the red curve represents the distribution of O-H₂ bond lengths.

Fig. 4. The average reduced density gradient（aRDG） calculations of weak interactions in water molecules under different conditions.（a） depicts the chain-like H-bond network structure in 1DCW，where only one H atom in 1DCW is involved in H-bond formation； the light blue curve represents the semi-sectional structure of a carbon nanotube，and the dark blue discs represent H-bond interactions；（b） shows the tetrahedral H-bond network structure in BW，where two H atoms of a BW molecule can simultaneously form H-bond with adjacent water molecules

Fig. 5. Three-dimensional motion trajectories of H atoms in 1DCW and BW.（a），（b） respectively show the projections of the motion trajectories of H₁ and H₂ atoms in 1DCW on a two-dimensional plane；（c），（d） respectively represent the projections of the motion trajectories of H₁ and H₂ atoms in BW on a two-dimensional plane. These trajectories are distinguished by red，green，and blue curves，representing the motion paths of H atoms on the XY plane，XZ plane，and YZ plane respectively

Table 1. Force field parameters of the flexible SPC/E water model. The ${\epsilon }_{ij}$and${\sigma }_{ij}$ represent the L-J interaction parameters; $q_O$ and $q_H$ denote the charges of the oxygen and hydrogen atoms, respectively; ${\theta }_{H-O-H}$ represents the bond angle of H-O-H; $r_{O-H}$ denotes the length of the O-H bond