Borehole reinforcement based on polymer materials induced by liquid-gas phase transition in simulating lunar coring

• A novel reinforcement fluid that undergoes liquid-gas phase transition in vacuum is proposed for lunar borehole stabilization. • The developed reinforcement liquid increases the cohesion of simulated lunar soil from 2 to 800 kPa, significantly enhancing borehole stability. • High-vacuum (5 Pa) and low-temperature (−30 to 50 °C) coring experiments confirm spontaneous release and effective borehole reinforcement. • Optimal solute concentration for borehole reinforcement is between 0.15 and 0.25 g/mL.