%0 Journal Article %T Surface Properties of Novel Surfactant, Dihexadecyl Gemini Phosphate, Monolayers on Water Surface by Dropping Method %A Yusuke Kobayashi %A Takahiko Amano %A Keijiro Taga %A Yasushi Yamamoto %A Zameer Shervani %A Masato Yamamoto %J Journal of Biophysical Chemistry %P 39-50 %@ 2153-0378 %D 2017 %I Scientific Research Publishing %R 10.4236/jbpc.2017.84004 %X We have synthesized first novel dihexadecyl phosphate (DHGP-n) gemini surfactants containing alkyl chain ((C_nH_2n); n = 3, 4, 5, and 6) spacers. Surfactants were used to form monolayers on water surface. Surface tension measurement (STm), Brewster angle microscopy (BAM), and density functional theory (DFT) calculation were used to investigate these monolayers. Surface pressure (Іа) and molecular area (A); Іа-A isotherm curves of all DHGP-n gemini surfactants showed a gradual increase in surface pressure without any break points in the curves, confirmed the formation of liquid-expand (LE) type monolayers. BAM observations also supported the STm results. Limited molecular area (A₀) of these monolayers depended on the spacer of gemini surfactants without spacer n = 4. Longer alkyl chain spacer in the series had higher value of A₀ in