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Chemical binding

About: Chemical binding is a research topic. Over the lifetime, 1822 publications have been published within this topic receiving 52516 citations.


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Journal ArticleDOI
TL;DR: In this paper, the adsorption of trivalent arsenic [As(OH)3] onto the bimetallic Au19Cu and Au19Pd clusters was computationally studied.
Abstract: The adsorption of trivalent arsenic [As(OH)3] onto the bimetallic Au19Cu and Au19Pd clusters was computationally studied to get insights about as embedded electrodes with bimetallic gold nanostructures can serve for the adsorption and subsequent sensing of arsenic traces from polluted waters. It was found that the As(OH)3 chemisorption onto Au19Cu and Au19Pd is reached with adsorption energies of up to 1.02 and 1.48 eV, respectively, with even a stable physisorption with energies of up to 0.57 eV. Both arsenic and oxygen atoms were determined to bind with adsorbent Cu and Pd atoms, and all the interactions appear to be stable in an aqueous environment. The stability of the adsorbent–pollutant interactions was explained in terms of metal–pollutant chemical binding, charge transfer, dispersion force interactions and non-conventional OH···Au hydrogen bonds. Moreover, the As(OH)3 adsorption on the metal clusters is also accompanied by changes in the reactivity, electron transfer and decreases of the HOMO–LUMO energy gap with respect to the isolated substrates; the highest changes obtained in the mentioned properties are classified in the order Au19Pd > Au19Cu > Au20.

14 citations

Journal ArticleDOI
TL;DR: A new type of biocomposite of nano aptite (NAP)/poly(1,4-phenylene sulfide)poly (2, 4-phenyl sulfide acid) (PPS-PPSA) copolymer was prepared by polycondensation in 1-methyl-2-pyrrolidone (NMP).
Abstract: A new type of biocomposite of nano aptite (NAP)/poly(1,4-phenylene sulfide)–poly (2,4-phenylene sulfide acid) (PPS–PPSA) copolymer (NAP/PPS–PPSA) was prepared by polycondensation in 1-methyl-2-pyrrolidone (NMP). The NAP particles with a size of about 40–60 nm in diameter and 60–80 nm in length uniformly distributed in the composite. The presence of 2,4-phenylene sulfide acid in copolymer increased the copolymer affinity to NAP. Duo to some strong combinations of calcium ion (Ca2+), carboxyl (–COO−) and phosphate radicals ion ( PO 4 3 - ) in the composite, interfacial chemical binding exists between copolymer and NAP. The NAP/PPS–PPSA biocomposite not only had good homogeneity but also had high NAP content of 60%, which was a potential bioactive material to be used as load-bearing implants or fixation in bone repair.

14 citations

Journal ArticleDOI
TL;DR: Solubility and stability of the sensor in water indicate that the sensor is an ideal system for the biological and environmental applications.
Abstract: A new colorimetric sensor was designed for the screening pH changes in solutions, as well as, detection of some cations. The sensor preparation includes the chemical binding of alizarine red S (ARS) as a sensor of pH and cation to graphene quantum dots (GQD). Loading ARS on GQD led to the formation of water soluble sensor which finally responded to the colorimetric detection of some cations in water. Solubility and stability of the sensor in water indicate that the sensor is an ideal system for the biological and environmental applications. To demonstrate the applicability of the new sensor, the colorimetric responds of sensor were examined for some cations including Fe3+, Co2+, Ca2+, As3+, Cd2+, Hg2+, Pb2+, Sn2+, Al3+, and Cr3+. The colorimetric detections of all the ions were performable individually in a solution. In addition, GQD-ARS as a colorimetric sensor detected Co2+ at pH < 0.6 with limit of quantification 0.08 mM and Fe3+ at 0.6 < pH < 4.0 with limit of quantification 0.03 mM in the mixture of cations.

14 citations

Journal ArticleDOI
TL;DR: In this article, the authors report on ceramic materials based on hazardous industrial sewage slurry containing galvanic glass waste and clay-sand mixture, which are sintered at temperatures of 700, 750, 800 and 850 degrees C to provide flexural strengths of up to 12.5 MPa, coefficients of thermal expansion 6.1-9.0% and water absorption of 11.95-13.20%.

14 citations

Journal ArticleDOI
TL;DR: Results obtained with 2,4-dinitrophenol and S-13 show that the shapes of curves obtained when uncoupler concentration is plotted against respiration rate are the same for both “stoichiometric” and classical uncouplers, and it is suggested that this does not necessarily identify a more specific uncoupling reaction than that observed in the absence of azide.

14 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20223
202178
202076
201989
201866
201769