Topic
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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TL;DR: In this paper, a new optical sensor for mercury(II) ions is developed based on immobilization of 4-(2-pyridylazo)-resorcinol (PAR) on a triacetylcellulose membrane.
Abstract: A new optical sensor for mercury(II) ions is developed based on immobilization of 4-(2-pyridylazo)-resorcinol (PAR) on a triacetylcellulose membrane. Chemical binding of Hg2+ ions in solution with a PAR immobilized on the triacetylcellulose surface could be monitored spectrophotometrically at 525 nm. The optode shows excellent response over a wide concentration range of 5–3360 μM Hg(II) with a limit of detection of 1.5 μM Hg(II). The influence of factors responsible for the improved sensitivity of the sensor were studied and identified. The response time of the optode was 20 min for a stable solution, and was 15 min for a stirrer solution. The influence of potential interfering ions on the determination of 5 × 10−5 M Hg(II) was studied. The sensor was applied for determination of Hg(II) in water samples.
59 citations
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29 May 2009TL;DR: In this article, the optical properties of silver doped diamond like carbon films (Ag:DLC) deposited by the RF reactive sputtering technique were investigated by using an X-ray photoelectron spectroscopy.
Abstract: Optical properties of silver doped diamond like carbon films (Ag:DLC) deposited by the RF reactive sputtering technique were studied in detail. The chemical binding energy and the composition of the films were investigated by using an X-ray photoelectron spectroscopy. Optical transparency and optical band gap decreased with the silver incorporation to the DLC film. Optical band gap calculated from transmittance spectra decreased from 2.55 to 1.95 eV with a variation of Ag concentration from 0 to 12.5 at.%. Urbach parameter determined from the band tail of the transmittance spectra showed to increase with the doping concentration.
59 citations
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TL;DR: Treatment of aldehyde-fixed pericardium with L-glutamic acid at pH 3.5 and storage in a nontoxic, bacteriostatic solution resulted in a lower degree of calcification in 63-day subcutaneous implants in rats, as compared with commercially available tissue.
59 citations
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TL;DR: The important finding is that insoluble lipid monolayers allow the discrimination between possible modes of ion-lipid interaction, reflecting the effect of ion size on ionic properties and interactions.
Abstract: In this work, we use Langmuir monolayers of dipalmitoyl phosphatidylcholine (DPPC) as model systems to enhance the understanding of specific anion effects in physicochemical and biological systems. The 298 K isotherms (equation of state, EOS) of DPPC over solutions of a range of sodium salts depend strongly on the type and concentration of the salt in the subphase. We focus in particular on the liquid expanded phase region of the DPPC EOS and assume that the deviation of the isotherms over electrolyte solutions from that over pure water is due entirely to the charging of the lipid monolayer by the ions. We then examine the ability of a range of phenomenological continuum models to explain the pressure increase in the presence of electrolytes. The important finding is that insoluble lipid monolayers allow the discrimination between possible modes of ion−lipid interaction. Chemical binding models, simple or modified, cannot fit the range of data presented in this work. Both dispersion interaction and partit...
59 citations
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TL;DR: In this paper, a multi-component carbide coatings were prepared by reactive co-sputtering of Ti, Al, Cr, Nb and Y targets in an Ar + CH 4 atmosphere, and the films were investigated for elemental and phase composition, chemical binding state, texture, morphology, residual stress, roughness, hardness, friction and wear using X-ray photoelectron spectroscopy (XPS), XRD, atomic force microscopy (AFM), surface profilometry, hardness measurements and tribological tests.
Abstract: (TiAlCrNbY)C multi-component carbide coatings were prepared by reactive co-sputtering of Ti, Al, Cr, Nb and Y targets in an Ar + CH 4 atmosphere. The films were investigated for elemental and phase composition, chemical binding state, texture, morphology, residual stress, roughness, hardness, friction and wear using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), atomic force microscopy (AFM), surface profilometry, hardness measurements, and tribological tests. The metals in the carbide films were found in an almost equiatomic ratio, whereas the carbon content varied from about 46 to 82 at.%. For film composition close to stoichiometry, a single fcc solid solution phase with an (111) preferred orientation was detected. The coatings with higher carbon concentrations (69–82 at.%) exhibited an amorphous structure. Fine grained and smooth surface morphologies were observed by AFM. While the metallic film exhibited a low tensile stress (∼ 0.240 GPa), the carbides coatings were subjected to compressive stress, with values (from 0.200 to 1.950 GPa) strongly depending on CH 4 flow rate. The hardness values (13–23 GPa) were found to be lower than those usually reported for binary carbides (30–35 GPa), while the dry friction coefficients were in the range 0.05–0.25.
58 citations