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RISS 인기검색어
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- 저자 : Opoku Francis (검색결과 3 건)
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Opoku Francis,Govender Penny P. 한국물리학회 2022 Current Applied Physics Vol.40 No.-
Recently, fabricating type-II vertical van der Waals (vdWs) heterostructure is a promising material for hydrogen production. The absorption capability, charge density distributions, band alignments and electronic properties of the monolayers and heterostructures are systematically investigated using computational studies. Using ab initio molecular dynamics, binding energy and phonon calculations, the stability of the heterostructures are verified. Both heterostructures are type-II materials, which can increase the separation of charge carriers. Moreover, the charge density difference and the potential drop across the interface of MSe2/BSe creates a high built-in electric field that can prevent the recombination of charge carriers. We found that the visible-light optical properties of both heterostructures are much enhanced with suitable bandgap energy for water splitting. The band alignment suggests that the heterostructures straddle water redox potentials in acid solutions (0 < pH < 7). Our study predicted that MSe2/BSe vdW heterostructures have great potential for photocatalytic hydrogen production.
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Edward Ebow Kwaansa-Ansah,Samuel Owusu Nti,Francis Opoku 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.2
Health risk assessment and heavy metal accumulationwere evaluated in the muscles of widely consumedTrachurus trachurus, Lutjanus fulgens, Lutjanusgoreensis, Acanthocybium solandri, Pagellus bellottii,Scomber colias and Dentex congoensis fish species inAsafo, Ghana. The fish samples were prepared using a wetdigestion method and the heavy metals analysis was performedwith the flame atomic absorption spectrophotometer(UNICAM 969). The results revealed that Mn, Cu, Zn,Cd, and Pb concentrations were below the permissiblevalues set by several health institutions. The health riskassessment based on non-carcinogenic and cancer factorseffect indicates no adverse health effect of fish intake. Theresults of heavy metal concentrations showed that differentvarieties of fish could be safe for human intake and theresults are anticipated to create alertness among the localpeople.
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Abaye, Daniel A.,Aniagyei, Albert,Adedia, David,Nielsen, Birthe V.,Opoku, Francis Korean Society for Mass Spectrometry 2022 Mass spectrometry letters Vol.13 No.3
During electrospray ionization mass spectrometry (ESI-MS) analysis of proteins, the addition of supercharging agents allows for adjusting the maximal charge state, affecting the charge state distribution, and increases the number of ions reaching the detector thus, improving signal detection. We postulate that in di-substituted arene isomers, molecules with higher polarizability values should generate greater interactions and hence elicit higher signal intensities. Polarizability is an electronic parameter which has been demonstrated to predict many chemical interactions. Many properties can be predicted based on charge polarization. Molecular polarizability is a vital descriptor for explaining intermolecular interactions. We employed DFT (density functional/Hartree-Fock hybrid model, B3LYP)-derived descriptors and computed molecular polarizability for ten disubstituted arene reagents, each set made up of three (ortho, meta, para) isomers, with reported use as supercharging reagents during ESI experiments. The atomic electronic inputs were ionization potential (IP), electron affinity (EA), electronegativity (𝛘), hardness (η), chemical potential (µ), and dipole moment (D). We determined that the para isomers showed the highest polarizability values in nine of the ten sets. There was no difference between the ortho and meta isomers. Polarizability also increased with increasing complexity of the substituents on the benzene ring. Polarizability correlated positively with IP, EA, 𝛘, η, and D but correlated negatively with chemical potential. This DFT study predicts that the para isomers of di-substituted arene isomers should elicit the strongest ESI responses. An experimental comparison of the three isomers, especially of larger supercharging molecules, could be carried out to establish this premise.
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