The PDF file includes:

• Fig. S1. Characterization of GOLC dispersion.
• Fig. S2. Analysis of velocity profile.
• Fig. S3. Estimation of time scale for Ca²⁺ diffusion.
• Fig. S4. Diameter and extension rate of ejected fluid at v₂ = 5.5v₁ as a function of distance.
• Fig. S5. POM images and birefringence intensity profiles of gel fibers.
• Fig. S6. Sol-gel transition and gel behavior of GO solution.
• Fig. S7. Zeta potential of GO as a function of pH in aqueous dispersion at a concentration of 0.05 mg ml⁻¹.
• Fig. S8. XPS spectra of GO gels.
• Fig. S9. Raman spectra of GO gels.
• Fig. S10. Determination of the degree of orientation in gel fibers.
• Fig. S11. Stress-strain curves of dried GO fibers under 10% min⁻¹ of tensile strain.
• Fig. S12. Determination of the degree of orientation in dried fibers.
• Fig. S13. I-V curves of NICs of different lengths.
• Fig. S14. Experimental setup for measuring the ionic conductivity of NICs.
• Fig. S15. Removal of Ca²⁺ by ion exchange in GO gel fibers.
• Fig. S16. Modeling of GO gel fiber nanochannels using the configuration of GO films.
• Table S1. Yield stress values of GO gels prepared with different amounts of NH₄OH.
• Table S2. Quantitative XPS analyses of cylindrical gels and gel fibers.
• Table S3. Comparison of mechanical properties of our GO fibers with previously reported GO fibers and other nanocarbon-based fibers.
• Table S4. Structural parameters of dried GO fibers.
• Table S5. Comparison of ionic conductivity of GO gel fibers with various nanosheet films.
• References (39–50)

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Other Supplementary Material for this manuscript includes the following:

• Movie S1 (.mp4 format). In situ observation of dynamic assembly of GO gel fiber at v₂ = v₁.
• Movie S2 (.mp4 format). In situ observation of dynamic assembly of GO gel fiber at v₂ = 3v₁.