In light of recent climate and environmental goals, there is an urgent need for the development of efficient mitigation technologies such as carbon capture. While spray-based carbon capture systems can offer high CO2 absorption rates compared to packed columns, their optimisation requires a fine control on spray homogeneity and droplet properties (e.g. size and relative velocity). More specifically, denser mono-disperse sprays with micron scale droplets have been found to increase the rate of CO2 absorption. One approach that has not previously been investigated is to control the solvent spray properties through flash boiling atomisation to consistently produce fine and homogenous droplets. To address this gap, we present optical measurements comparing the performance of solvents atomised with and without flash boiling. Diffuse-back illumination extinction imaging was used for temporal characterisation of spray morphology. We tested a 20:80 (w/w) blend of triethanolamine and methanol under four temperature conditions to vary the amount of superheat. Absorption capacities and CO2 concentration removal are reported for each tested condition, showing significant improvements at the higher temperature conditions.