Superdybrophobic

1. Superdybrophobic 5 min Non hydrophobic 100 nm Pb UPD Method Modeling BET Method Electrochemical Processing of Nanoporous Structures for Superhydrophobic Materials and Polymer ImprintingNikolay Dimitrov, SUNY at Binghamton, DMR 0603019 The non-hydrophobic to super-hydrophobic transition of a Ag surface was studied by Ag electrodeposition (results presented on the right) and potential controlled displacement (PCD) of Cu with Ag (I) ions. It was shown that a specific dendrite density and height is needed for a structure to become super-hydrophobic. It was also demonstrated the transition occurs 5-6 times faster in the PCD case owing to the additional reduction power of provided by Cu (I) ions that populate locally the near electrode vicinity. An inexpensive, fast, selective, and sensitive technique for surface area measurement of metallic nanoporous materials (MNPM) was developed. The approach based on underpotential deposition (UPD) of metals on foreign substrates is shown to be more sensitive than BET technique and surface modeling for determining surface area of MNPM. The figure presented on the right clearly links the surface area results obtained by Pb UPD with top view SEM images of NP Au substrates prepared by de-alloying of Ag-Au alloy. Y. Liu, et al. J. Phys. Chem. C, 2009, 113, 12362–12372

2. 5th Kurt Schwabe Symposium, Erlangen, Germnay HFG Electrochemical Processing of Nanoporous Structures for Superhydrophobic Materials and Polymer ImprintingNikolay Dimitrov, SUNY at Binghamton, DMR 0603019 • A large portion of the work associated with the synthesis of nanoporous substrates was presented in May this year in an invited talk on 5th Kurt Schwabe Meeting, Erlangen, Germany by Dr. Stoyan Bliznakov (the presenter in the middle picture). 5th Kurt Schwabe Symposium, May 2009 Erlangen. Germany • A spin-off work of our project emphasizing routes for determination of trace amounts of Pb (II) ions and published in Analytical Chemistry was presented in August 2008 by the PI on 236th National Meeting of ACS in Philadelphia. • The first collaborative paper on super-hydrophobicity with UniSA, Australia was published in Langmuir in early 2009. 236th National Meeting & ExpositionAugust 17-21, 2008, Philadelphia, PA, New Electrochemical Method for Quantitative Determination of Trace Amounts of Lead, Oral Presentation by Nikolay Dimitrov See also: L.T. Viyannalage et al. Anal. Chem. 2008, 80 (6), 2042 S. Bliznakov et al., 2009, 25 (8), 4760 • An ongoing collaboration with the group of Dr. Toni Spassov (Faculty of Chemistry, Sofia University, Bulgaria) resulted in a publication in Journal of Alloys and Compounds. A new work on amorphous Ag-Cu alloy strips was initiated in June this year during Dr. Bliznakov’s visit in Sofia University. A publication is expected upon finalization of the experimental stage. Sofia University, Bulgaria Faculty of Chemistry See also: T. Spassov et al. J. Alloys. Comp., 2009, 478, (1-2), 232