NOVELTY - Manufacture of immobilized liquid membrane involves producing particles having distribution of sizes, using primary portion of aqueous solution, covering the particles with primary portion of hexane solution, creating microcapsules comprising flexible wall encapsulating a respective one of particles, and creating a gap membrane between the microcapsules. The aqueous solution and hexane solution are immiscible. The flexible wall is formed by carrying out polymerization reaction of respective particle and portion of hexane solution.    USE - Manufacture of immobilized liquid membrane used for separating carbon dioxide from gas mixture, for use in crude oil recovery, methane and biomass production, and bioregenerative application.    ADVANTAGE - The immobilized liquid membrane having gas separation efficiency is manufactured. The flexibility of walls and leakage around the microcapsules are efficiently reduced.    DETAILED DESCRIPTION - Manufacture of immobilized liquid membrane involves producing particles having distribution of sizes, using primary portion of aqueous solution, covering the particles with primary portion of hexane solution, creating microcapsules comprising flexible wall encapsulating a respective one of particles, and creating a gap membrane between the microcapsules. The aqueous solution and hexane solution are immiscible. The flexible wall is formed by carrying out polymerization reaction of respective particles and portion of hexane solution. The gap membrane is formed by carrying out polymerization reaction of secondary portion of aqueous solution and secondary portion of hexane solution. Each of microcapsules and gap membrane are permeable to primary gas of mixture of gasses comprising primary gas and secondary gas. Each of microcapsules and gap membrane are substantially impermeable to the secondary gas. INDEPENDENT CLAIMS are included for the following:    (1) immobilized liquid membrane; and    (2) separation of carbon dioxide from gas mixture.