The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Angela Šurca Vuk - One of the best experts on this subject based on the ideXlab platform.
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in situ electrochemical afm ex situ IR Reflection absorption and confocal raman studies of corrosion processes of aa 2024 t3
Corrosion Science, 2016Co-Authors: Ahmed Kreta, Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Boris Orel, Angela Šurca VukAbstract:The corrosion processes of AA 2024 were analysed via the combined approach of advanced in situ and ex situ analytical tools. FIRstly, IR Reflection–absorption spectroscopy enabled the identification of a pseudo-boehmite layer on initial surface, which remained present also after the ex situ spectroelectrochemical treatment at different potentials. Secondly, formation of oxyhydroxides was confIRmed by confocal Raman spectroscopy. To get a deeper insight into the morphology changes, a three-electrode in situ electrochemical AFM cell was constructed. The results of in situ measurements revealed a gradual increase in the surface roughness. Trenching around intermetallic particles and corrosion deposits were also observed.
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Ex situ IR Reflection–absorption and in situ AFM electrochemical characterisation of the 1,2-bis(trimethoxysilyl)ethane-based protective coating on AA 2024 alloy
Corrosion Science, 2016Co-Authors: Mirjana Rodošek, Ahmed Kreta, Miran Gaberšček, Angela Šurca VukAbstract:Abstract The organic–inorganic protective coatings for the aluminium alloy AA 2024-T3 were produced from a precursor 1,2-bis(trimethoxysilyl)ethane. The structural properties of the coatings were analysed using SEM, EDS, contact angles and IR Reflection–absorption at the near grazing incidence angle conditions. Moreover, the forced degradation of the protective coatings at the anodic potentials was studied by various means of the ex situ and in situ analytical approaches with the aim to verify theIR applicability. The ex situ IR Reflection–absorption spectroscopy revealed the prominent changes in the bands like hydration of coatings, cleavage of some siloxane bonds, changes in the regions of C H vibrations and breaking of some Si O Al bonds. The in situ electrochemical AFM approach revealed a decrease in the surface roughness during immersion of the coating, followed by the pretty similar values during application of the chronocoulometric pulses. The impedance spectroscopy indIRectly confIRmed a gradual dissolution/degradation of the coating.
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ex situ IR Reflection absorption and in situ afm electrochemical characterisation of the 1 2 bis trimethoxysilyl ethane based protective coating on aa 2024 alloy
Corrosion Science, 2016Co-Authors: Mirjana Rodošek, Ahmed Kreta, Miran Gaberšček, Angela Šurca VukAbstract:Abstract The organic–inorganic protective coatings for the aluminium alloy AA 2024-T3 were produced from a precursor 1,2-bis(trimethoxysilyl)ethane. The structural properties of the coatings were analysed using SEM, EDS, contact angles and IR Reflection–absorption at the near grazing incidence angle conditions. Moreover, the forced degradation of the protective coatings at the anodic potentials was studied by various means of the ex situ and in situ analytical approaches with the aim to verify theIR applicability. The ex situ IR Reflection–absorption spectroscopy revealed the prominent changes in the bands like hydration of coatings, cleavage of some siloxane bonds, changes in the regions of C H vibrations and breaking of some Si O Al bonds. The in situ electrochemical AFM approach revealed a decrease in the surface roughness during immersion of the coating, followed by the pretty similar values during application of the chronocoulometric pulses. The impedance spectroscopy indIRectly confIRmed a gradual dissolution/degradation of the coating.
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In situ electrochemical AFM, ex situ IR Reflection–absorption and confocal Raman studies of corrosion processes of AA 2024-T3
Corrosion Science, 2016Co-Authors: Ahmed Kreta, Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Boris Orel, Angela Šurca VukAbstract:The corrosion processes of AA 2024 were analysed via the combined approach of advanced in situ and ex situ analytical tools. FIRstly, IR Reflection–absorption spectroscopy enabled the identification of a pseudo-boehmite layer on initial surface, which remained present also after the ex situ spectroelectrochemical treatment at different potentials. Secondly, formation of oxyhydroxides was confIRmed by confocal Raman spectroscopy. To get a deeper insight into the morphology changes, a three-electrode in situ electrochemical AFM cell was constructed. The results of in situ measurements revealed a gradual increase in the surface roughness. Trenching around intermetallic particles and corrosion deposits were also observed.
Mirjana Rodošek - One of the best experts on this subject based on the ideXlab platform.
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Protective coatings for AA 2024 based on cyclotetrasiloxane and various alkoxysilanes
Corrosion Science, 2017Co-Authors: Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Matjaž Koželj, Romana Cerc Korošec, Angelja K. SurcaAbstract:Abstract An alkoxysilyl-functionalised precursor, 1,3,5,7-tetramethyl-1,3,5,7-tetra-(2-(3-trimethoxysilyl)propylsulfanyl)ethyl-cyclotetrasiloxane was synthesized to produce protective coatings. The addition of bis-end-capped 1,2-bis(trimethoxysilyl)ethane and various alkoxysilanes led to formation of more crosslinked coatings as evidenced by 29 Si NMR and IR Reflection-absorption spectroscopy. The structural changes during forced anodic polarization were followed using ex situ IR Reflection-absorption and in situ Raman spectroelectrochemistry. The former technique shows hydration of coatings and cleavage of some siloxane bonds. In situ Raman bands revealed decrease in intensity, while imaging enabled to follow pit formation. The potentiodynamic polarization, impedance spectroscopy and exposure in salt chamber showed that coating with hexadecyltrimethoxysilane is the most efficient.
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in situ electrochemical afm ex situ IR Reflection absorption and confocal raman studies of corrosion processes of aa 2024 t3
Corrosion Science, 2016Co-Authors: Ahmed Kreta, Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Boris Orel, Angela Šurca VukAbstract:The corrosion processes of AA 2024 were analysed via the combined approach of advanced in situ and ex situ analytical tools. FIRstly, IR Reflection–absorption spectroscopy enabled the identification of a pseudo-boehmite layer on initial surface, which remained present also after the ex situ spectroelectrochemical treatment at different potentials. Secondly, formation of oxyhydroxides was confIRmed by confocal Raman spectroscopy. To get a deeper insight into the morphology changes, a three-electrode in situ electrochemical AFM cell was constructed. The results of in situ measurements revealed a gradual increase in the surface roughness. Trenching around intermetallic particles and corrosion deposits were also observed.
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Ex situ IR Reflection–absorption and in situ AFM electrochemical characterisation of the 1,2-bis(trimethoxysilyl)ethane-based protective coating on AA 2024 alloy
Corrosion Science, 2016Co-Authors: Mirjana Rodošek, Ahmed Kreta, Miran Gaberšček, Angela Šurca VukAbstract:Abstract The organic–inorganic protective coatings for the aluminium alloy AA 2024-T3 were produced from a precursor 1,2-bis(trimethoxysilyl)ethane. The structural properties of the coatings were analysed using SEM, EDS, contact angles and IR Reflection–absorption at the near grazing incidence angle conditions. Moreover, the forced degradation of the protective coatings at the anodic potentials was studied by various means of the ex situ and in situ analytical approaches with the aim to verify theIR applicability. The ex situ IR Reflection–absorption spectroscopy revealed the prominent changes in the bands like hydration of coatings, cleavage of some siloxane bonds, changes in the regions of C H vibrations and breaking of some Si O Al bonds. The in situ electrochemical AFM approach revealed a decrease in the surface roughness during immersion of the coating, followed by the pretty similar values during application of the chronocoulometric pulses. The impedance spectroscopy indIRectly confIRmed a gradual dissolution/degradation of the coating.
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ex situ IR Reflection absorption and in situ afm electrochemical characterisation of the 1 2 bis trimethoxysilyl ethane based protective coating on aa 2024 alloy
Corrosion Science, 2016Co-Authors: Mirjana Rodošek, Ahmed Kreta, Miran Gaberšček, Angela Šurca VukAbstract:Abstract The organic–inorganic protective coatings for the aluminium alloy AA 2024-T3 were produced from a precursor 1,2-bis(trimethoxysilyl)ethane. The structural properties of the coatings were analysed using SEM, EDS, contact angles and IR Reflection–absorption at the near grazing incidence angle conditions. Moreover, the forced degradation of the protective coatings at the anodic potentials was studied by various means of the ex situ and in situ analytical approaches with the aim to verify theIR applicability. The ex situ IR Reflection–absorption spectroscopy revealed the prominent changes in the bands like hydration of coatings, cleavage of some siloxane bonds, changes in the regions of C H vibrations and breaking of some Si O Al bonds. The in situ electrochemical AFM approach revealed a decrease in the surface roughness during immersion of the coating, followed by the pretty similar values during application of the chronocoulometric pulses. The impedance spectroscopy indIRectly confIRmed a gradual dissolution/degradation of the coating.
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In situ electrochemical AFM, ex situ IR Reflection–absorption and confocal Raman studies of corrosion processes of AA 2024-T3
Corrosion Science, 2016Co-Authors: Ahmed Kreta, Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Boris Orel, Angela Šurca VukAbstract:The corrosion processes of AA 2024 were analysed via the combined approach of advanced in situ and ex situ analytical tools. FIRstly, IR Reflection–absorption spectroscopy enabled the identification of a pseudo-boehmite layer on initial surface, which remained present also after the ex situ spectroelectrochemical treatment at different potentials. Secondly, formation of oxyhydroxides was confIRmed by confocal Raman spectroscopy. To get a deeper insight into the morphology changes, a three-electrode in situ electrochemical AFM cell was constructed. The results of in situ measurements revealed a gradual increase in the surface roughness. Trenching around intermetallic particles and corrosion deposits were also observed.
Miran Gaberšček - One of the best experts on this subject based on the ideXlab platform.
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Protective coatings for AA 2024 based on cyclotetrasiloxane and various alkoxysilanes
Corrosion Science, 2017Co-Authors: Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Matjaž Koželj, Romana Cerc Korošec, Angelja K. SurcaAbstract:Abstract An alkoxysilyl-functionalised precursor, 1,3,5,7-tetramethyl-1,3,5,7-tetra-(2-(3-trimethoxysilyl)propylsulfanyl)ethyl-cyclotetrasiloxane was synthesized to produce protective coatings. The addition of bis-end-capped 1,2-bis(trimethoxysilyl)ethane and various alkoxysilanes led to formation of more crosslinked coatings as evidenced by 29 Si NMR and IR Reflection-absorption spectroscopy. The structural changes during forced anodic polarization were followed using ex situ IR Reflection-absorption and in situ Raman spectroelectrochemistry. The former technique shows hydration of coatings and cleavage of some siloxane bonds. In situ Raman bands revealed decrease in intensity, while imaging enabled to follow pit formation. The potentiodynamic polarization, impedance spectroscopy and exposure in salt chamber showed that coating with hexadecyltrimethoxysilane is the most efficient.
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in situ electrochemical afm ex situ IR Reflection absorption and confocal raman studies of corrosion processes of aa 2024 t3
Corrosion Science, 2016Co-Authors: Ahmed Kreta, Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Boris Orel, Angela Šurca VukAbstract:The corrosion processes of AA 2024 were analysed via the combined approach of advanced in situ and ex situ analytical tools. FIRstly, IR Reflection–absorption spectroscopy enabled the identification of a pseudo-boehmite layer on initial surface, which remained present also after the ex situ spectroelectrochemical treatment at different potentials. Secondly, formation of oxyhydroxides was confIRmed by confocal Raman spectroscopy. To get a deeper insight into the morphology changes, a three-electrode in situ electrochemical AFM cell was constructed. The results of in situ measurements revealed a gradual increase in the surface roughness. Trenching around intermetallic particles and corrosion deposits were also observed.
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Ex situ IR Reflection–absorption and in situ AFM electrochemical characterisation of the 1,2-bis(trimethoxysilyl)ethane-based protective coating on AA 2024 alloy
Corrosion Science, 2016Co-Authors: Mirjana Rodošek, Ahmed Kreta, Miran Gaberšček, Angela Šurca VukAbstract:Abstract The organic–inorganic protective coatings for the aluminium alloy AA 2024-T3 were produced from a precursor 1,2-bis(trimethoxysilyl)ethane. The structural properties of the coatings were analysed using SEM, EDS, contact angles and IR Reflection–absorption at the near grazing incidence angle conditions. Moreover, the forced degradation of the protective coatings at the anodic potentials was studied by various means of the ex situ and in situ analytical approaches with the aim to verify theIR applicability. The ex situ IR Reflection–absorption spectroscopy revealed the prominent changes in the bands like hydration of coatings, cleavage of some siloxane bonds, changes in the regions of C H vibrations and breaking of some Si O Al bonds. The in situ electrochemical AFM approach revealed a decrease in the surface roughness during immersion of the coating, followed by the pretty similar values during application of the chronocoulometric pulses. The impedance spectroscopy indIRectly confIRmed a gradual dissolution/degradation of the coating.
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ex situ IR Reflection absorption and in situ afm electrochemical characterisation of the 1 2 bis trimethoxysilyl ethane based protective coating on aa 2024 alloy
Corrosion Science, 2016Co-Authors: Mirjana Rodošek, Ahmed Kreta, Miran Gaberšček, Angela Šurca VukAbstract:Abstract The organic–inorganic protective coatings for the aluminium alloy AA 2024-T3 were produced from a precursor 1,2-bis(trimethoxysilyl)ethane. The structural properties of the coatings were analysed using SEM, EDS, contact angles and IR Reflection–absorption at the near grazing incidence angle conditions. Moreover, the forced degradation of the protective coatings at the anodic potentials was studied by various means of the ex situ and in situ analytical approaches with the aim to verify theIR applicability. The ex situ IR Reflection–absorption spectroscopy revealed the prominent changes in the bands like hydration of coatings, cleavage of some siloxane bonds, changes in the regions of C H vibrations and breaking of some Si O Al bonds. The in situ electrochemical AFM approach revealed a decrease in the surface roughness during immersion of the coating, followed by the pretty similar values during application of the chronocoulometric pulses. The impedance spectroscopy indIRectly confIRmed a gradual dissolution/degradation of the coating.
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In situ electrochemical AFM, ex situ IR Reflection–absorption and confocal Raman studies of corrosion processes of AA 2024-T3
Corrosion Science, 2016Co-Authors: Ahmed Kreta, Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Boris Orel, Angela Šurca VukAbstract:The corrosion processes of AA 2024 were analysed via the combined approach of advanced in situ and ex situ analytical tools. FIRstly, IR Reflection–absorption spectroscopy enabled the identification of a pseudo-boehmite layer on initial surface, which remained present also after the ex situ spectroelectrochemical treatment at different potentials. Secondly, formation of oxyhydroxides was confIRmed by confocal Raman spectroscopy. To get a deeper insight into the morphology changes, a three-electrode in situ electrochemical AFM cell was constructed. The results of in situ measurements revealed a gradual increase in the surface roughness. Trenching around intermetallic particles and corrosion deposits were also observed.
Richard Mendelsohn - One of the best experts on this subject based on the ideXlab platform.
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Monolayer–multilayer transitions in a lung surfactant model: IR Reflection–absorption spectroscopy and atomic force microscopy
European Biophysics Journal, 2005Co-Authors: Lin Wang, Peng Cai, Hans-joachim Galla, Carol R. Flach, Richard MendelsohnAbstract:A hydrophobic pulmonary surfactant protein, SP-C, has been implicated in surface-associated activities thought to facilitate the work of breathing. Model surfactant films composed of lipids and SP-C display a reversible transition from a monolayer to surface-associated multilayers upon compression and expansion at the aIR/water (A/W) interface. The molecular-level mechanics of this process are not yet fully understood. The current work uses atomic force microscopy on LangmuIR–Blodgett films to verify the formation of multilayers in a dipalmitoylphosphatidylcholine, dipalmitoylphosphatidylglycerol, cholesterol, and SP-C model system. Isotherms of SP-C-containing films are consistent with exclusion and essentially complete respreading during compression and expansion, respectively. Multilayer formation was not detected in the absence of SP-C. Most notable are the results from IR Reflection–absorption spectroscopy (IRRAS) conducted at the A/W interface, where the position and intensity of the Amide I band of SP-C reveal that the predominantly helical structure changes its orientation in monolayers versus multilayers. IRRAS measurements indicate that the helix tilt angle changed from approximately 80° in monolayers to a transmembrane orientation in multilayers. The results constitute the fIRst quantitative measure of helix orientation in mixed monolayer/multilamellar domains at the A/W interface and provide insight into the molecular mechanism for SP-C-facilitated respreading of surfactant.
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monolayer multilayer transitions in a lung surfactant model IR Reflection absorption spectroscopy and atomic force microscopy
European Biophysics Journal, 2005Co-Authors: Lin Wang, Peng Cai, Hans-joachim Galla, Carol R. Flach, Richard MendelsohnAbstract:A hydrophobic pulmonary surfactant protein, SP-C, has been implicated in surface-associated activities thought to facilitate the work of breathing. Model surfactant films composed of lipids and SP-C display a reversible transition from a monolayer to surface-associated multilayers upon compression and expansion at the aIR/water (A/W) interface. The molecular-level mechanics of this process are not yet fully understood. The current work uses atomic force microscopy on LangmuIR–Blodgett films to verify the formation of multilayers in a dipalmitoylphosphatidylcholine, dipalmitoylphosphatidylglycerol, cholesterol, and SP-C model system. Isotherms of SP-C-containing films are consistent with exclusion and essentially complete respreading during compression and expansion, respectively. Multilayer formation was not detected in the absence of SP-C. Most notable are the results from IR Reflection–absorption spectroscopy (IRRAS) conducted at the A/W interface, where the position and intensity of the Amide I band of SP-C reveal that the predominantly helical structure changes its orientation in monolayers versus multilayers. IRRAS measurements indicate that the helix tilt angle changed from approximately 80° in monolayers to a transmembrane orientation in multilayers. The results constitute the fIRst quantitative measure of helix orientation in mixed monolayer/multilamellar domains at the A/W interface and provide insight into the molecular mechanism for SP-C-facilitated respreading of surfactant.
Ahmed Kreta - One of the best experts on this subject based on the ideXlab platform.
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in situ electrochemical afm ex situ IR Reflection absorption and confocal raman studies of corrosion processes of aa 2024 t3
Corrosion Science, 2016Co-Authors: Ahmed Kreta, Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Boris Orel, Angela Šurca VukAbstract:The corrosion processes of AA 2024 were analysed via the combined approach of advanced in situ and ex situ analytical tools. FIRstly, IR Reflection–absorption spectroscopy enabled the identification of a pseudo-boehmite layer on initial surface, which remained present also after the ex situ spectroelectrochemical treatment at different potentials. Secondly, formation of oxyhydroxides was confIRmed by confocal Raman spectroscopy. To get a deeper insight into the morphology changes, a three-electrode in situ electrochemical AFM cell was constructed. The results of in situ measurements revealed a gradual increase in the surface roughness. Trenching around intermetallic particles and corrosion deposits were also observed.
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Ex situ IR Reflection–absorption and in situ AFM electrochemical characterisation of the 1,2-bis(trimethoxysilyl)ethane-based protective coating on AA 2024 alloy
Corrosion Science, 2016Co-Authors: Mirjana Rodošek, Ahmed Kreta, Miran Gaberšček, Angela Šurca VukAbstract:Abstract The organic–inorganic protective coatings for the aluminium alloy AA 2024-T3 were produced from a precursor 1,2-bis(trimethoxysilyl)ethane. The structural properties of the coatings were analysed using SEM, EDS, contact angles and IR Reflection–absorption at the near grazing incidence angle conditions. Moreover, the forced degradation of the protective coatings at the anodic potentials was studied by various means of the ex situ and in situ analytical approaches with the aim to verify theIR applicability. The ex situ IR Reflection–absorption spectroscopy revealed the prominent changes in the bands like hydration of coatings, cleavage of some siloxane bonds, changes in the regions of C H vibrations and breaking of some Si O Al bonds. The in situ electrochemical AFM approach revealed a decrease in the surface roughness during immersion of the coating, followed by the pretty similar values during application of the chronocoulometric pulses. The impedance spectroscopy indIRectly confIRmed a gradual dissolution/degradation of the coating.
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ex situ IR Reflection absorption and in situ afm electrochemical characterisation of the 1 2 bis trimethoxysilyl ethane based protective coating on aa 2024 alloy
Corrosion Science, 2016Co-Authors: Mirjana Rodošek, Ahmed Kreta, Miran Gaberšček, Angela Šurca VukAbstract:Abstract The organic–inorganic protective coatings for the aluminium alloy AA 2024-T3 were produced from a precursor 1,2-bis(trimethoxysilyl)ethane. The structural properties of the coatings were analysed using SEM, EDS, contact angles and IR Reflection–absorption at the near grazing incidence angle conditions. Moreover, the forced degradation of the protective coatings at the anodic potentials was studied by various means of the ex situ and in situ analytical approaches with the aim to verify theIR applicability. The ex situ IR Reflection–absorption spectroscopy revealed the prominent changes in the bands like hydration of coatings, cleavage of some siloxane bonds, changes in the regions of C H vibrations and breaking of some Si O Al bonds. The in situ electrochemical AFM approach revealed a decrease in the surface roughness during immersion of the coating, followed by the pretty similar values during application of the chronocoulometric pulses. The impedance spectroscopy indIRectly confIRmed a gradual dissolution/degradation of the coating.
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In situ electrochemical AFM, ex situ IR Reflection–absorption and confocal Raman studies of corrosion processes of AA 2024-T3
Corrosion Science, 2016Co-Authors: Ahmed Kreta, Mirjana Rodošek, Miran Gaberšček, Lidija Slemenik Perše, Boris Orel, Angela Šurca VukAbstract:The corrosion processes of AA 2024 were analysed via the combined approach of advanced in situ and ex situ analytical tools. FIRstly, IR Reflection–absorption spectroscopy enabled the identification of a pseudo-boehmite layer on initial surface, which remained present also after the ex situ spectroelectrochemical treatment at different potentials. Secondly, formation of oxyhydroxides was confIRmed by confocal Raman spectroscopy. To get a deeper insight into the morphology changes, a three-electrode in situ electrochemical AFM cell was constructed. The results of in situ measurements revealed a gradual increase in the surface roughness. Trenching around intermetallic particles and corrosion deposits were also observed.