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RISS 인기검색어
- 검색키워드
- 저자 : Samy M. Shaban (검색결과 4 건)
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Samy M. Shaban,김동환 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.6
Three different Gemini compounds containing different lengths of multi-carbonyl groups were synthesized, and the effect of their hydrocarbon tail length on the AgNPs synthesis was investigated. The Gemini surfactants with the long hydrocarbon chain tail produces small AgNPs with a narrow size distribution and high colloidal stability in an aqueous phase. The surface parameters of the aqueous solution were affected by the hydrocarbon chain length as well as phase temperature. The critical micelle concentration, assessed by surface tension and conductometric measurements, decreases with both increasing solution temperature and increasing hydrocarbon tail length. Thermodynamic calculations predicted the ability of the synthesized Gemini surfactant to adsorb on the phase surface and aggregate in a cluster.
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Fiaz Hussain,Samy M. Shaban,김진환,김동환 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6
Well-dispersed silver nanoparticles (AgNPs) were synthesized using a benign, one-pot process based on a low-cost wet chemistry technique. Monoethanolamine was used as a strong reducing agent and poly(acrylic acid) (PAA) was used as a stabilizing agent. After the addition of these reagents to a reaction system, one-pot synthesis of AgNPs was completed in ~45min at 75 oC with a reaction efficiency of 92.4%. The average particle size of the aqueous dispersion of AgNPs was 14.83±5.96 nm, and the dispersion remained stable even after 14 months in an ambient dark environment, which may be due to the electrostatic repulsion of the carboxylate anions of the stabilizing agent. The role of PAA in the stabilization of the AgNPs was analyzed via Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy. The highly stable AgNPs in the aqueous system showed high catalytic activity for the reduction of methylene blue and p-nitrophenol in the presence of sodium borohydride as the reducing agent based on pseudo-first-order kinetics
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Plasmonic-Multichromatic Sensor for Gallic Acid Assay Utilizing Ag-Coated Au Nanobipyramids
Mostafa Mohamed H.,Shaban Samy M.,Hafez Eslam,Shin Jihoon,김동환 한국바이오칩학회 2023 BioChip Journal Vol.17 No.4
Gallic acid (GA) is known for its valuable properties as an antioxidant, anti-cancer, and anti-mutagenic compound, making its detection in foods and drugs of paramount importance. In this research, we introduce a novel multichromatic sensor for GA detection, which employs the controlled growth of silver nanoparticles (AgNPs) on the surface of gold nanobipyramids (AuNBPs). The sensor exploits GA's capability to reduce AgNO 3, resulting in the growth of AgNPs and a subsequent blue shift of localized surface plasmon resonance (LSPR) as large as 195 nm. This unique multicolor response ranges from light gray to green, blue–violet, and pink, allowing for distinctive visual identifi cation of GA concentrations. The sensor's performance demonstrates a wide dynamic range of 0–175 μM, and a detection limit (LOD) as low as 0.139 μM. Notably, the applicability of this multichromic plasmonic probe was successfully tested for GA assay in both Black and Green tea, showcasing highly satisfactory recovery effi ciencies and affi rming its potential for food quality control applications. The presented multichromatic sensor off ers a promising approach for rapid and sensitive GA detection in various food and pharmaceutical products, enhancing the monitoring and assessment of GA content for improved product quality and safety.
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Ahmed H. Elged,Samy M. Shaban,M.M. Eluskkary,I. Aiad,E.A. Soliman,Asma M. Elsharif,김동환 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
In this study, three anionic-cationic zwitterionic Gemini surfactants containing three differenthydrophobic tails were prepared and their chemical structures were confirmed by Fourier transforminfrared (FTIR) and 1H nuclear magnetic resonance (NMR) spectroscopy. The hydrophobic tail of thesynthesized phospho-zwitterionic Gemini surfactants significantly affected the morphological structureof silver nanoparticles (AgNPs) prepared using a photochemical reduction method, which utilizedsunlight as a surplus source of a reducing agent. Increasing the hydrophobic tail length of the surfactantpromoted the formation of AgNPs exhibiting smaller particle sizes with a uniform structure. Moreover, asconfirmed by ultraviolet-visible (UV-Vis) spectroscopy, dynamic light scattering (DLS), and transmissionelectron microscopy (TEM), these AgNPs displayed higher stability in solution than those synthesized inthe presence of Gemini surfactants with a shorter hydrocarbon tail. The impact of tail variation on thecatalytic and antimicrobial performance of AgNPs was also examined. The synthesized surfactant/AgNPsystems showed remarkable catalytic activity in the removal of certain toxic pollutants, including paranitrophenol(p-NP) and methylene blue (MB), which were converted into less toxic compounds in thepresence of NaBH4. Notably, the surfactant exhibiting the longest chain hydrocarbon, i.e., ZGH, producedAgNPs with the highest catalytic activity. This is thefirst study concerning the effects of the surfactant tailon the catalytic activity of NPs. The good biological performance of the synthesized Gemini surfactantsagainst sulfate-reducing bacteria (SRB) demonstrated their potential for application in mitigating thegrowth of SRB during petroleum treatment processes. The combination of the synthesized surfactantswith AgNPs significantly enhanced their biological performance.
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