DNA origami has been used to orchestrate reactions with nano-precision using a variety of biomole... more DNA origami has been used to orchestrate reactions with nano-precision using a variety of biomolecules. Here, the dynamics of albumin-assisted, localized single-molecule DNA polymerization by terminal deoxynucleotidyl transferase on a 2D DNA origami are monitored using AFM in liquid. Direct visualization of the surface activity revealed the mechanics of growth.
Graphene is the most attractive carbon-based material at present and attracting increasing attent... more Graphene is the most attractive carbon-based material at present and attracting increasing attention as promising candidates for applications in numerous areas, because of its extraordinary chemical, thermal and mechanical properties. In this paper, we discussed an innovative and simple method to synthesize titanium dioxide (TiO2) nanoclusters, using graphene as a mid-step template not as a component of final product. Using this method, the graphene was firstly fully coated with TiO2 nanoparticles by the thermal decomposition of titanium (IV) isopropoxide in a supercritical carbon dioxide (SC-CO2) at 200 °C; the developed TiO2/graphene composites then were heated in an oxygen atmosphere. Eventually the TiO2 nanoclusters were obtained. The prepared TiO2 nanoclusters showed irregular features with high surface coverage, providing promises in a wide range of applications, especially for photo-degradation of organic compounds in aqueous solution under the radiation of UV-light.
The environmental crisis due to greenhouse gas CO2 emissions is motivating researchers to discove... more The environmental crisis due to greenhouse gas CO2 emissions is motivating researchers to discover new materials and efficient technologies for CO2 capture and conversion. In this work, density functional theory (DFT) has been employed to investigate the surface curvature dependence of the adsorption and (electro) reduction of CO2 on SiC nanomaterials, including single layer SiC sheets and nanotubes. The DFT calculations show that both the adsorption energy and reduction free energy decrease with the decrease of the curvature of SiC nanotubes. SiC nanotubes with suitable curvature can capture and reduce CO2 effectively. However a single layer SiC sheet (without curvature) cannot adsorb CO2 at all. These findings are particularly relevant to generate fuels with a carbon-neutral footprint.
A low cost AFM, ezAFM is developed for educational purposes as well as research. Optical beam def... more A low cost AFM, ezAFM is developed for educational purposes as well as research. Optical beam deflection method is used to measure the deflection of cantilever. ezAFM scanner is built using voice coil motors (VCM) with ˜50x50x6 μm scan area. The microscope uses alignment free cantilevers, which minimizes setup times. FPGA based AFM feedback Control electronics is developed. FPGA technology allows us to drive all peripherals in parallel. ezAFM Controller is connected to PC by USB 2.0 interface as well as Wi-Fi. We have achieved <5nm lateral and ˜0.01nm vertical resolution. ezAFM can image single atomic steps in HOPG and mica. An optical microscope with <3 μm resolution is also integrated into the system. ezAFM supports different AFM operation modes such as dynamic mode, contact mode, lateral force microscopy. Advanced modes like magnetic force microscopy and electric force microscopy will be implemented later on. The new ezAFM system provides, short learning times for student labs, quick setup and easy to transport for portable applications with the best price/performance ratio. The cost of the system starts from 15,000, with system performance comparable with the traditional AFM systems.
DNA origami has been used to orchestrate reactions with nano-precision using a variety of biomole... more DNA origami has been used to orchestrate reactions with nano-precision using a variety of biomolecules. Here, the dynamics of albumin-assisted, localized single-molecule DNA polymerization by terminal deoxynucleotidyl transferase on a 2D DNA origami are monitored using AFM in liquid. Direct visualization of the surface activity revealed the mechanics of growth.
Graphene is the most attractive carbon-based material at present and attracting increasing attent... more Graphene is the most attractive carbon-based material at present and attracting increasing attention as promising candidates for applications in numerous areas, because of its extraordinary chemical, thermal and mechanical properties. In this paper, we discussed an innovative and simple method to synthesize titanium dioxide (TiO2) nanoclusters, using graphene as a mid-step template not as a component of final product. Using this method, the graphene was firstly fully coated with TiO2 nanoparticles by the thermal decomposition of titanium (IV) isopropoxide in a supercritical carbon dioxide (SC-CO2) at 200 °C; the developed TiO2/graphene composites then were heated in an oxygen atmosphere. Eventually the TiO2 nanoclusters were obtained. The prepared TiO2 nanoclusters showed irregular features with high surface coverage, providing promises in a wide range of applications, especially for photo-degradation of organic compounds in aqueous solution under the radiation of UV-light.
The environmental crisis due to greenhouse gas CO2 emissions is motivating researchers to discove... more The environmental crisis due to greenhouse gas CO2 emissions is motivating researchers to discover new materials and efficient technologies for CO2 capture and conversion. In this work, density functional theory (DFT) has been employed to investigate the surface curvature dependence of the adsorption and (electro) reduction of CO2 on SiC nanomaterials, including single layer SiC sheets and nanotubes. The DFT calculations show that both the adsorption energy and reduction free energy decrease with the decrease of the curvature of SiC nanotubes. SiC nanotubes with suitable curvature can capture and reduce CO2 effectively. However a single layer SiC sheet (without curvature) cannot adsorb CO2 at all. These findings are particularly relevant to generate fuels with a carbon-neutral footprint.
A low cost AFM, ezAFM is developed for educational purposes as well as research. Optical beam def... more A low cost AFM, ezAFM is developed for educational purposes as well as research. Optical beam deflection method is used to measure the deflection of cantilever. ezAFM scanner is built using voice coil motors (VCM) with ˜50x50x6 μm scan area. The microscope uses alignment free cantilevers, which minimizes setup times. FPGA based AFM feedback Control electronics is developed. FPGA technology allows us to drive all peripherals in parallel. ezAFM Controller is connected to PC by USB 2.0 interface as well as Wi-Fi. We have achieved <5nm lateral and ˜0.01nm vertical resolution. ezAFM can image single atomic steps in HOPG and mica. An optical microscope with <3 μm resolution is also integrated into the system. ezAFM supports different AFM operation modes such as dynamic mode, contact mode, lateral force microscopy. Advanced modes like magnetic force microscopy and electric force microscopy will be implemented later on. The new ezAFM system provides, short learning times for student labs, quick setup and easy to transport for portable applications with the best price/performance ratio. The cost of the system starts from 15,000, with system performance comparable with the traditional AFM systems.
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Papers by Husnu Aslan
materials and efficient technologies for CO2 capture and conversion. In this work, density functional theory
(DFT) has been employed to investigate the surface curvature dependence of the adsorption and (electro)
reduction of CO2 on SiC nanomaterials, including single layer SiC sheets and nanotubes. The DFT
calculations show that both the adsorption energy and reduction free energy decrease with the decrease
of the curvature of SiC nanotubes. SiC nanotubes with suitable curvature can capture and reduce CO2
effectively. However a single layer SiC sheet (without curvature) cannot adsorb CO2 at all. These findings
are particularly relevant to generate fuels with a carbon-neutral footprint.
materials and efficient technologies for CO2 capture and conversion. In this work, density functional theory
(DFT) has been employed to investigate the surface curvature dependence of the adsorption and (electro)
reduction of CO2 on SiC nanomaterials, including single layer SiC sheets and nanotubes. The DFT
calculations show that both the adsorption energy and reduction free energy decrease with the decrease
of the curvature of SiC nanotubes. SiC nanotubes with suitable curvature can capture and reduce CO2
effectively. However a single layer SiC sheet (without curvature) cannot adsorb CO2 at all. These findings
are particularly relevant to generate fuels with a carbon-neutral footprint.