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In this paper, Mg-doped ZnO nanoparticles were synthesized by the facile sol–gel method. The crystalline structure, characteristic absorption bands and morphology of the obtained Mg-doped ZnO nanoparticles were studied by XRD, FTIR and TEM. The thermal degradation behaviour of the samples was investigated by differential scanning calorimetry (DSC) and thermogravimetry (TG). The effect of Mg concentrations and annealing temperatures on the antibacterial properties of the obtained nanoparticles was investigated in detail. The results indicated that doping Mg ions into ZnO lattice could enhance its antibacterial activity. Antibacterial assay demonstrated that Mg-doped ZnO with 7% Mg content annealed at 400 °C had the strongest antibacterial activity against Listeria monocytogenes (98.7%). This study indicated that the inhibition rate of ZnO nanoparticles increased with the formation of granular structure and the decrease of ZnO size due to the doping of Mg ions into the ZnO lattice. 相似文献
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We present and examine an approximate but ab initio many-body approach, viz., potential harmonics expansion method (PHEM), which includes two-body correlations for dilute Bose-Einstein
condensates. Comparing the total ground state energy for three trapped interacting bosons calculated in PHEM with the exact
energy, the new method is shown to be very good in the low density limit which is necessary for achieving Bose-Einstein condensation
experimentally.
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Nath Surjatapa Bhattacharya Barnali Sarkar Utpal Singh T. Sanjoy 《Journal of fluorescence》2022,32(4):1321-1336
Journal of Fluorescence - In this work, a donor–acceptor substituted aromatic system ((E)-N-((E)-3-(4 (dimethylamino)phenyl) allylidene)-4-(trifluoromethyl) benzenamine (DPATB) has been... 相似文献
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Mondal Animesh Naskar Barnali Goswami Sanchita Prodhan Chandraday Chaudhuri Keya Mukhopadhyay Chhanda 《Molecular diversity》2020,24(1):93-106
Molecular Diversity - A quick access tool for the one-pot, chromatography-free synthesis of the diversified dihydrospiro[indeno[1,2-b]pyridine-4,3′-indoline or... 相似文献
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Barnali Dutta Basile F. E. Curchod Pablo Campomanes Dr. Euro Solari Dr. Rosario Scopelliti Dr. Ursula Rothlisberger Prof. Kay Severin Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2010,16(28):8400-8409
Cyclopentadienyl–ruthenium half‐sandwich complexes with η2‐bound alkyne ligands have been suggested as catalytic intermediates in the early stages of Ru‐catalyzed reactions with alkynes. We show that electronically unsaturated complexes of the formula [RuCl(Cp^)(η2‐RC≡CR′)] can be stabilized and crystallized by using the sterically demanding cyclopentadienyl ligand Cp^ (Cp^=η5‐1‐methoxy‐2,4‐tert‐butyl‐3‐neopentyl‐cyclopentadienyl). Furthermore we demonstrate that [RuCl2(Cp^)]2 is an active and regioselective catalyst for the [2+2+2] cyclotrimerization of alkynes. The first elementary steps of the reaction of mono(η2‐alkyne) complexes containing {RuCl(Cp*)} (Cp*=η5‐C5Me5) and {RuCl(Cp^)} fragments with alkynes were investigated by DFT calculations at the M06/6‐31G* level in combination with a continuum solvent model. Theoretical results are able to rationalize and complement the experimental findings. The presence of the sterically demanding Cp^ ligand increases the activation energy required for the formation of the corresponding di(η2‐alkyne) complexes, enhancing the initial regioselectivity, but avoiding the evolution of the system towards the expected cyclotrimerization product when bulky substituents are present. Theoretical results also show that the electronic structure and stability of a metallacyclic intermediate is strongly dependent on the nature of the substituents present in the alkyne. 相似文献
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Multiple emissions have been observed from benzil under different conditions in solutions at room temperature as well as in low temperature glass matrices at 77 K. Low temperature emission has been monitored in rigid matrices frozen under different conditions of illumination. Steady state and time-resolved results together with the ab initio quantum chemical calculations provide, for the first time, the assignments of the different fluorescence bands to the different geometries and∕or electronic states of the fluorophore molecule. It is revealed that the skew form of benzil emits from the first (S(1)) as well as the second excited singlet (S(2)) states depending on the excitation wavelength, while the relaxed transplanar conformer fluoresces only from the S(1) state. The yet unexplored emission band peaking at around 360 nm has been assigned to originate from the S(2) state. Ab initio calculations using the density functional theory at B3LYP∕6-31G?? level corroborate well with the experimental observations. 相似文献
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We adopt the potential harmonics expansion method for anab initio solution of the many-body system in a Bose condensate containing interacting bosons. Unlike commonly adopted mean-field theories,
our method is capable of handling two-body correlation properly. We disregard three- and higher-body correlations. This simplification
is ideally suited to dilute Bose Einstein condensates, whose number density is required to be so small that the interparticle
separation is much larger than the range of two-body interaction to avoid three- and higher-body collisions, leading to the
formation of molecules and consequent instability of the condensate. In our method we can incorporate realistic finite range
interactions. We calculate energies of low-lying states of a condensate containing23Na atoms and some thermodynamical properties of the condensate. 相似文献
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Barnali Bhattacharya Ngangbam Bedamani Singh Utpal Sarkar 《International journal of quantum chemistry》2015,115(13):820-829
This report aims to explore the possibility of using graphyne derivatives as UV‐light protector. Boron (B) and nitrogen (N) atoms are systematically substituted into the structures, and we find that BN‐substituted analogs exhibit distinct characteristics compared with their parent two‐dimensional structure. Due to the presence of BN at different sites, the optical band gap is tuned from infrared to UV via visible region depending on substitution sites. These findings will lead the way to utilize these BN doped structures in various optoelectronic applications such as in hybrid solar cell, electroluminescence cell, light emitting cell, and as selective electromagnetic radiation absorber. The origin of this tunable optical response and band gap is explained in the light of partial density of states analysis and electron density distribution. The presence of strong absorption peak in UV region indicates that these materials may be used as an excellent candidate for UV light protection. © 2015 Wiley Periodicals, Inc. 相似文献