Chemical and Biomolecular Engineering - Research Publications

Permanent URI for this collection

http://hdl.handle.net/11343/353

Filters

2014 3
2 1
Reset filters

Settings
Statistics
Citations
Author: Solomon, David × End date: 2014 ×

Search Results

Now showing 1 - 3 of 3
  • Item
    No Preview Available
    Method for controlling water evaporation
    SOLOMON, DH ; Prime, EL ; Sunartio, D ; Qiao, G ; Dagley, I ; Blencowe, A ( 2014)
  • Item
    No Preview Available
    Dynamic Performance of Duolayers at the Air/Water Interface. 1. Experimental Analysis
    Leung, AHM ; Prime, EL ; Tran, DNH ; Fu, Q ; Christofferson, AJ ; Yiapanis, G ; Yarovsky, I ; Qiao, GG ; Solomon, DH (AMER CHEMICAL SOC, 2014-09-18)
    Understanding, and improving, the behavior of thin surface films under exposure to externally applied forces is important for applications such as mimicking biological membranes, water evaporation mitigation, and recovery of oil spills. This paper demonstrates that the incorporation of a water-soluble polymer into the surface film composition, i.e., formation of a three-duolayer system, shows improved performance under an applied dynamic stress, with an evaporation saving of 84% observed after 16 h, compared to 74% for the insoluble three-monolayer alone. Canal viscometry and spreading rate experiments, performed using the same conditions, demonstrated an increased surface viscosity and faster spreading rate for the three-duolayer system, likely contributing to the observed improvement in dynamic performance. Brewster angle microscopy and dye-tagged polymers were used to visualize the system and demonstrated that the duolayer and monolayer system both form a homogeneous film of uniform, single-molecule thickness, with the excess material compacting into small floating reservoirs on the surface. It was also observed that both components have to be applied to the water surface together in order to achieve improved performance under dynamic conditions. These findings have important implications for the use of surface films in various applications where resistance to external disturbance is required.
  • Item
    No Preview Available
    Dynamic Performance of Duo layers at the Air/Water Interface. 2. Mechanistic Insights from All-Atom Simulations
    Christofferson, AJ ; Yiapanis, G ; Leung, AHM ; Prime, EL ; Tran, DNH ; Qiao, GG ; Solomon, DH ; Yarovsky, I (AMER CHEMICAL SOC, 2014-09-18)
    The novel duolayer system, comprising a monolayer of ethylene glycol monooctadecyl ether (C18E1) and the water-soluble polymer poly(vinylpyrrolidone) (PVP), has been shown to resist forces such as wind stress to a greater degree than the C18E1 monolayer alone. This paper reports all-atom molecular dynamics simulations comparing the monolayer (C18E1 alone) and duolayer systems under an applied force parallel to the air/water interface. The simulations show that, due to the presence of PVP at the interface, the duolayer film exhibits an increase in chain tilt, ordering, and density, as well as a lower lateral velocity compared to the monolayer. These results provide a molecular rationale for the improved performance of the duolayer system under wind conditions, as well as an atomic-level explanation for the observed efficacy of the duolayer system as an evaporation suppressant, which may serve as a useful guide for future development for thin films where resistance to external perturbation is desirable.