The Experts below are selected from a list of 93 Experts worldwide ranked by ideXlab platform
A. P. Limanskii - One of the best experts on this subject based on the ideXlab platform.
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Functionalization of amino-modified probes for atomic force microscopy
Biophysics, 2006Co-Authors: A. P. LimanskiiAbstract:The probes for atomic force microscopy (AFM) functionalized with bovine serum albumin (BSA) were obtained; they can be used for molecular recognition studies. The procedure of modification and functionalization of the AFM probe included three stages. First, amino probes were obtained by modification in vapors of an amino Silane Derivative. Then, a covalent bond was formed between the surface amino groups of the probe and a homobifunctional aminoreactive crosslinker. Finally, the probe with a covalently attached crosslinker was functionalized with BSA molecules. The AFM probes were characterized by force measurements at different stages of the modification; the adhesion force and the work of adhesion force were determined. The modification process was confirmed by visualization of BSA and supercoiled pGEMEX DNA molecules immobilized on the standard amino mica and on amino mica modified with a crosslinker.
F. Canepa - One of the best experts on this subject based on the ideXlab platform.
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Thiol-functionalized magnetic nanoparticles for static and dynamic removal of Pb(II) ions from waters
Journal of Nanoparticle Research, 2019Co-Authors: S. Villa, P. Riani, F. Soggia, E. Magi, F. CanepaAbstract:The synthesis of magnetite (Fe_3O_4) nanoparticles (NPs) and the functionalization by means of a Silane Derivative (3-mercaptopropyl) trimethoxySilane (MPTMS) as a way for heavy metal capture, i.e., Pb^2+ ions, has been investigated. A direct reaction between the active thiol organoSilane molecule and the surface of the magnetite nanoparticle is described. The coated nanoparticles, presenting an average diameter of about 20 nm, have been extensively characterized from the morphological, chemical, and physical point of view. The capture of Pb^2+ ions from aqueous solution has been performed both in static and dynamic mode, using in both cases a configuration of commercial NdFeB permanent magnets. The amount of heavy metal captured by the magnetic NPs as a function of time, as well as its fraction recovered by an EDTA solution, have been measured by inductively coupled plasma atomic emission spectrometry (ICP-AES). The Pb^2+ capture from a spiked water solution (5 mg/L) is very fast, reaching 91% in static conditions after only 10 min. Furthermore, dynamic data also demonstrated the possibility to apply the toxic heavy metal capture method to large volumes. Graphical abstract
Pingmei Wang - One of the best experts on this subject based on the ideXlab platform.
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one pot preparation of nano sio2 using a Silane Derivative as a coupling agent
Tenside Surfactants Detergents, 2016Co-Authors: Zhiping Du, Wanxu Wang, Jianghong Wu, Bin Ding, Pingmei WangAbstract:Abstract The nano-silica particles were prepared by one-pot method using absolute ethanol as solvent. After the nano-silica derived from TEOS was synthesized, the coupling agent was added into the above suspension without any filtration or purification processes to modify the nano SiO2. The optimum modification conditions were determined based on the degree of oil affinity and water sorption ratio. The size and morphology of SiO2 before and after modification were observed using Transmission Electron Microscopy. The introductions of the organic chains to their surfaces were measured using Ultraviolet and Visible Spectrophotometry, Fourier Transform Infrared Spectroscopy and 13C solid-state Nuclear Magnetic Resonance. The influences of the hydrophobicity of the organic functional group on the nano-silica particles were tested by the water contact angle. The results show that the organic chains had been grafted on the surface of nano-silica.
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a Silane Derivative as a coupling agent
2016Co-Authors: Zhiping Du, Wanxu Wang, Jianghong Wu, Bin Ding, Pingmei WangAbstract:The nano-silica particles were prepared by one-pot method using absolute ethanol as solvent. After the nano-silica derived from TEOS was synthesized, the coupling agent was added into the above suspension without any filtration or purification processes to modify the nano SiO2. The optimum modification conditions were determined based on the degree of oil affinity and water sorption ratio. The size and morphology of SiO2 before and after modification were observed using Transmission Electron Microscopy. The introductions of the organic chains to their surfaces were measured using Ultraviolet and Visible Spectrophotometry, Fourier Transform Infrared Spectroscopy and 13 C solid-state Nuclear Magnetic Resonance. The influences of the hydrophobicity of the organic functional group on the nano-silica particles were tested by the water contact angle. The results show that the organic chains had been grafted on the surface of nano-silica.
B. Perito - One of the best experts on this subject based on the ideXlab platform.
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Antibacterial activity of silver nanoparticles grafted on stone surface
Environmental Science and Pollution Research, 2014Co-Authors: F. Bellissima, M. Bonini, R. Giorgi, P. Baglioni, G. Barresi, G. Mastromei, B. PeritoAbstract:Microbial colonization has a relevant impact on the deterioration of stone materials with consequences ranging from esthetic to physical and chemical changes. Avoiding microbial growth on cultural stones therefore represents a crucial aspect for their long-term conservation. The antimicrobial properties of silver nanoparticles (AgNPs) have been extensively investigated in recent years, showing that they could be successfully applied as bactericidal coatings on surfaces of different materials. In this work, we investigated the ability of AgNPs grafted to Serena stone surfaces to inhibit bacterial viability. A Silane Derivative, which is commonly used for stone consolidation, and Bacillus subtilis were chosen as the grafting agent and the target bacterium, respectively. Results show that functionalized AgNPs bind to stone surface exhibiting a cluster disposition that is not affected by washing treatments. The antibacterial tests on stone samples revealed a 50 to 80 % reduction in cell viability, with the most effective AgNP concentration of 6.7 μg/cm^2. To our knowledge, this is the first report on antimicrobial activity of AgNPs applied to a stone surface. The results suggest that AgNPs could be successfully used in the inhibition of microbial colonization of stone artworks.
S. Villa - One of the best experts on this subject based on the ideXlab platform.
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Thiol-functionalized magnetic nanoparticles for static and dynamic removal of Pb(II) ions from waters
Journal of Nanoparticle Research, 2019Co-Authors: S. Villa, P. Riani, F. Soggia, E. Magi, F. CanepaAbstract:The synthesis of magnetite (Fe_3O_4) nanoparticles (NPs) and the functionalization by means of a Silane Derivative (3-mercaptopropyl) trimethoxySilane (MPTMS) as a way for heavy metal capture, i.e., Pb^2+ ions, has been investigated. A direct reaction between the active thiol organoSilane molecule and the surface of the magnetite nanoparticle is described. The coated nanoparticles, presenting an average diameter of about 20 nm, have been extensively characterized from the morphological, chemical, and physical point of view. The capture of Pb^2+ ions from aqueous solution has been performed both in static and dynamic mode, using in both cases a configuration of commercial NdFeB permanent magnets. The amount of heavy metal captured by the magnetic NPs as a function of time, as well as its fraction recovered by an EDTA solution, have been measured by inductively coupled plasma atomic emission spectrometry (ICP-AES). The Pb^2+ capture from a spiked water solution (5 mg/L) is very fast, reaching 91% in static conditions after only 10 min. Furthermore, dynamic data also demonstrated the possibility to apply the toxic heavy metal capture method to large volumes. Graphical abstract