Formation of weakly bound, ordered adlayers of CO on rutile TiO2(110): A combined experimental and theoretical study
The adsorption of CO on the rutile TiO2(110) surface was investigated using He atom scattering (HAS), high resolution electron energy loss spectroscopy (HREELS), thermal desorption spectroscopy (TDS),...
The adsorption of CO on the rutile TiO2(110) surface was investigated using He atom scattering (HAS), high resolution electron energy loss spectroscopy (HREELS), thermal desorption spectroscopy (TDS),...
Molecular origin of the negative heat capacity of hydrophilic hydration
The hydrophobic and hydrophilic hydrations are analyzed with the emphasis on the sign of the heat capacity of hydration (HCH). The angle-dependent integral equation theory combined with a multipolar w...
The hydrophobic and hydrophilic hydrations are analyzed with the emphasis on the sign of the heat capacity of hydration (HCH). The angle-dependent integral equation theory combined with a multipolar w...
Laser-induced aligned self-assembly on water surfaces
J. Chem. Phys. 130, 144704 (2009); doi:10.1063/1.3108540
Published 13 April 2009
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The key to functionalize of engineered molecularly nanometer thick films lies in the ability to reproducibly control their structure. A number of factors influence the film morphology of self-assembled films on solid or liquid surfaces, such as the structure of the molecules/particles, wetting, solvent hydrodynamics, and evaporation. An important example is the deposition of amphiphilic molecules from a volatile solution, self-assembled onto a water surface at monolayer coverage. Upon evaporation, a myriad of microscopic two-dimensional (2D) crystallites forms a ruptured film lying in random orientation on the surface, resulting in “2D powders.” Here we present a general technique, employing linearly polarized laser pulses and varying solvent composition to influence the assembly of molecules such as poly-benzyl-L-glutamate and alamethicin on water surfaces, resulting in ultrathin molecular films with aligned regions that point in the same direction, though macroscopically separated. The experimental results are tentatively explained by a mechanism that is based on excluded volume forces and “kick model” for the effect of laser pulses to induce molecular rotation that eventually results in an aligned pattern when the system is at a collective state.
©2009 American Institute of Physics
| History: | Received 23 December 2008; accepted 4 March 2009; published 13 April 2009 |
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