. ISRANALYTICA 2010, Tel Aviv, Israel, January 19-20, 2010
. ISRAEL JOURNAL OF CHEMISTRY. 2010;50 (3) :262-264.
Shacham R, Mandler D, Avnir D
. Pattern recognition in oxides thin-film electrodeposition: Printed circuits
. COMPTES RENDUS CHIMIE. 2010;13 (1-2, SI) :237-241.
Gofberg I, Mandler D
. Preparation and comparison between different thiol-protected Au nanoparticles
. JOURNAL OF NANOPARTICLE RESEARCH. 2010;12 (5) :1807-1811.
Okner R, Favaro G, Radko A, Domb AJ, Mandler D
. Electrochemical codeposition of sol-gel films on stainless steel: controlling the chemical and physical coating properties of biomedical implants
. Phys Chem Chem PhysPhysical chemistry chemical physics : PCCP. 2010;12 (46) :15265 - 73.Abstract
The electrochemically assisted codeposition of sol-gel thin films on stainless steel is described. Specifically, electrodeposition of films based on aminopropyltriethoxysilane (APTS), and its codeposition with propyltrimethoxysilane (PrTMOS) and phenyltrimethoxysilane (PhTMOS) has been accomplished by applying negative potentials. The latter increases the concentration of hydroxyl ions on the stainless steel surface and thus catalyzes the condensation and deposition of the sol-gel films. The films were characterized by profilometry, electrochemical impedance spectroscopy (EIS), alternating current voltammetry (ACV), goniometry, atomic force microscopy (AFM) and scanning electron microscopy (SEM). AFM and SEM analysis of codeposited APTS:PrTMOS films disclosed the structural changes induced by altering the deposition solution composition and the applied potential. Codeposited APTS:PhTMOS did not show any structural differences from their electrodeposited homopolymers, while Nano Scratch Test clearly revealed the changes in the elastic and adhesion properties, suggesting the formation of an APTS:PhTMOS composite. EIS of the films showed good resistance towards penetration of hydrophilic species, such as hexacyanoferrate. ACV measurements of the homo and codeposits showed the decrease of the interfacial capacity as a result of the electrochemical deposition. In essence, controllable sol-gel films with tunable chemical and physical properties based on controlling the combination of the precursors, pH and electrochemical properties can be electrodeposited on conducting surfaces. The application of this approach has been demonstrated by coating a stainless steel coronary stent.[on SciFinder (R)]
Ginzburg-Turgeman R, Mandler D
. Nanometric thin polymeric films based on molecularly imprinted technology: towards electrochemical sensing applications
. Phys Chem Chem PhysPhysical chemistry chemical physics : PCCP. 2010;12 (36) :11041 - 50.Abstract
A new approach for assembling selective electrodes based on molecularly imprinted polymers (MIPs) is presented. The approach is based on the radical polymerization of a mixture of methacrylic acid (MAA) and ethyleneglycol dimethacrylate (EGDMA) in the presence of an initiator, benzoyl peroxide (BPO) and an activator, N,N'-dimethyl-p-toluidine (DMpT) at room temperature and atmospheric pressure. To form nanometric thin polymeric films the polymerization solution was spin-coated in the course of polymerization. The different physical and chemical parameters that affected the properties of the films, such as the spinning rate and the EGDMA:MAA ratio, were studied and optimized. A variety of techniques, e.g., rheoscopy, SEM, AFM, profilometry and electrochemistry, were used to characterize the films and the polymerization process. By optimizing the conditions very thin and reproducible films could be prepared and imprinted. The electrochemical behavior of the films showed that they were permeable to water-soluble electroactive species providing that either polyethylene glycol or template species were added to the polymerization mixture. Finally, we demonstrated that films imprinted with ferrocenylmethyl alcohol (Fc-MeOH) successfully extracted the imprinted species after their removal from MIPs.[on SciFinder (R)]
Tanami G, Gutkin V, Mandler D
. Thin nanocomposite films of polyaniline/Au nanoparticles by the Langmuir-Blodgett technique
. LangmuirLangmuir : the ACS journal of surfaces and colloids. 2010;26 (6) :4239 - 45.Abstract
The Langmuir-Blodgett (LB) method was used to deposit multilayers of polyaniline (PANI)- and mercaptoethanesulfonate (MES)-stabilized Au nanoparticles. The electrostatic interaction between the negatively charged nanoparticles in the subphase and the positively charged PANI at the air-water interface assisted the deposition of the nanocomposite film onto a solid support. These PANI/Au-NPs films were characterized using cyclic voltammetry, copper under potential deposition, scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. We found that the nanocomposite layers were uniform and reproducible. The density of Au-NPs in the monolayer depended on the acidity of the subphase as well as on the nanoparticles concentration. Moreover, the Au-NPs extrude above the PANI and therefore could be used as nanoelectrodes for the underpotential deposition (UPD) of copper.[on SciFinder (R)]
Malel E, Ludwig R, Gorton L, Mandler D
. Localized deposition of Au nanoparticles by direct electron transfer through cellobiose dehydrogenase
. ChemistryChemistry (Weinheim an der Bergstrasse, Germany). 2010;16 (38) :11697 - 706.Abstract
Cellobiose dehydrogenase (CDH) is a fascinating extracellular fungal enzyme that consists of two domains, one carrying a flavin adenine dinucleotide (FAD) and the other a cytochrome-type heme b group as cofactors. The two domains are interconnected by a linker and electrons can shuttle from the FAD to the heme group by intramolecular electron transfer. Electron transfer between CDH and an electrode can occur by direct electron transfer (DET) and by mediated electron transfer (MET). This characteristic makes CDH an interesting candidate for integration in systems such as biosensors and biofuel cells. Moreover, it makes CDH an alternative for the reduction of metal ions through DET and MET. In this work we have explored the localized deposition of gold on Pd substrates by CDH through DET and MET. For this purpose we exploited the advantage of scanning electrochemical microscopy (SECM) as a patterning tool. We first demonstrated that gold nanoparticles can be formed in homogenous solution. Then we showed that Au nanoparticles can also be locally formed and deposited on surfaces through DET at low pH and by MET at neutral pH using benzoquinone/hydroquinone as mediator.[on SciFinder (R)]
Tanami G, Gutkin V, Mandler D
. Thin Nanocomposite Films of Polyaniline/Au Nanoparticles by the Langmuir-Blodgett Technique.
LangmuirLangmuir. 2010;26 (6) :4239 - 4245.Abstract
The Langmuir-Blodgett (LB) method was used to deposit multilayers of polyaniline (PANI)- and mercaptoethanesulfonate (MES)-stabilized Au nanoparticles. The electrostatic interaction between the neg. charged nanoparticles in the subphase and the pos. charged PANI at the air-H2O interface assisted the deposition of the nanocomposite film onto a solid support. These PANI/Au-NPs films were characterized using cyclic voltammetry, Cu underpotential deposition, SEM, at. force microscopy, and XPS. The nanocomposite layers were uniform and reproducible. The d. of Au-NPs in the monolayer depended on the acidity of the subphase as well as on the nanoparticles concn. Also, the Au-NPs extrude above the PANI and therefore could be used as nanoelectrodes for the underpotential deposition (UPD) of Cu. [on SciFinder(R)]
. Electroanalytical methods: Guide to experiments and applications, 2nd ed: Edited by Fritz Scholz.
Anal. Bioanal. Chem.Analytical and Bioanalytical Chemistry. 2010;398 (7-8) :2771 - 2772.
Magdassi S, Mandler D, Levy I
.; 2010. Electrochemical coating of conductive surfaces by organic nanoparticles.Abstract
An electrodeposition process is provided for depositing a film of org. nanoparticles from liq. dispersion on conductive surfaces. A special feature of the nanoparticles is their ability to aggregate as a response to pH change. The diffusing phase was formed by polylactic acid (43.9 mg) dissoln. in acetone (7.5 mL) and this phase was added dropwise to the dispersing phase of water (TDW, 20 mL) contg. Na oleate (22.2 mg) and NaOH (0.3 mg) while applying continuous moderate stirring to give a dispersion of polylactic acid nanoparticles (av. diam. 153 nm). [on SciFinder(R)]