Bacillus firmus Bacillus halodurans CO2 foam EOR Microbial Enhanced Oil Recovery Pickering emulsions SAG SAGD alcohols asphaltene biotransformation colloid and interfacial science contact angles cyclodextrins dynamic interfacial tension electric double layer emulsions enhanced oil recovery fluid-fluid interactions heavy oil heavy oil and bitumen heavy oil recovery in-situ rheology inclusion complexes interfaces interfacial complexation low salinity waterflooding metal ion interactions microfluidics monolayer