In Situ and ex Situ Infrared Studies of Nature and Structure of Thiol Monolayers Adsorbed on Cuprous Sulfide at Controlled Potential

Mielczarski, J.; Mielczarski, Ela; Zachwieja, J.B.; Cases, J. M.

doi:10.1021/la00007a072

Cited by 53 publications

(74 citation statements)

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“…53 Our experience shows that the qualitative and quantitative interpretation of reflection spectra improves tremendously by the use of spectral simulation. [54][55][56][57][58][59][60][61][62] Without the theoretical optical consideration of the system under investigation, con- clusive interpretation of spectroscopic reflection data is impossible or very limited at best.…”

Section: Resultsmentioning

confidence: 99%

Real Time Evaluation of Composition and Structure of Concanavalin A Adsorbed on a Polystyrene Surface

2008

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In situ qualitative and quantitative evaluations of adsorbed submonolayers and multilayers of the protein Concanavalin A (ConA) on a polystyrene surface were carried out by attenuated total reflection infrared spectroscopy. The influence of pH and adsorption time on the composition and structure of the adsorbed protein layers was investigated by comparison of the experimental spectra with simulated spectra of hypothetical multilayer systems with the assumed composition, thickness, and structure. This methodology allows the differentiation of observed spectral changes that result from pure optical effects, associated with the passing of an incident beam through the multilayer system, from the chemical and structural changes caused by physicochemical interactions of proteins with polymer surfaces. This represents significant progress since small variations in the band positions or intensities of amide I and amide II infrared absorbance bands have an important interpretation consequence. The applied methodology significantly reduces the misinterpretation of recorded spectra of protein layers and is rewarded by a deep insight of the structure and composition of the samples. The composition, structure, and kinetics of the adsorption of ConA and hydration level of the adsorbed layers were evaluated in detail. Competitive adsorption of bovine serum albumin on pre-adsorbed ConA layers also was investigated to characterize the ConA surface distribution. Parallel studies using X-ray photoelectron spectroscopy support the conclusions drawn from infrared spectroscopic investigations on ConA molecular distributions at the polymer surface. Two-step models that describe ConA submonolayer formation at pH 4.8 and multilayer formation at pH 7.8 are proposed.

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Section: Resultsmentioning

confidence: 99%

Real Time Evaluation of Composition and Structure of Concanavalin A Adsorbed on a Polystyrene Surface

2008

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“…The single band obtained at 979.9 cm −1 is shifted to 983.6 cm −1 and sharpened with the increase in temperature from 283 to 293 K. Further, some new peaks also appear at 999.1, 1006, and 1036.8 cm −1 . According to Mielczarski et al [31,32] the bands near 1010 cm −1 are characteristic of the cuprous ethyl xanthate complex randomly oriented at the surface of cuprous sulfide, and the peak at 1036.8 cm −1 can be assigned to dixanthogen, which is probably formed on the surface according to the reactions…”

Section: Ftir Studiesmentioning

confidence: 99%

Temperature effect on xanthate sorption by chalcopyrite

Mustafa¹,

Hamid²,

Naeem³

2004

Journal of Colloid and Interface Science

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“…The FTIR spectra of different samples are shown in Fig.4. Fig.4(b) shows that there are obvious characteristic peaks at 2 963.6, 1 467.1, 1 372.2, 1 266.0, [18], pyrite interacts with xanthate to form dixanthogen and the characteristic peaks of dixanthogen appear at 1 269 and 1 024 cm −1 . By analyzing Fig.4(b) in wavenumber range of 1 000−1 300 cm −1 , it can be found that there are adsorption peaks at 1 266.0 and 1 033.6 cm −1 on pyrite surface, which indicates that there is dixanthogen formation on pyrite surface.…”

Section: Mechanism Of Mineral-lsc Interactionmentioning

confidence: 99%

Effect of organic depressant lignosulfonate calcium on separation of chalcopyrite from pyrite

Liu

Sun

et al. 2009

J. Cent. South Univ. Technol.

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In order to selectively separate chalcopyrite from pyrite，the effect of organic depressant lignosulfonate calcium (LSC) on the flotation separation of chalcopyrite from pyrite was investigated by flotation tests. The depression mechanism was studied by Fourier-transform-infrared (FTIR) analysis. The flotation tests of single mineral show that LSC can depress the flotation of pyrite in a certain pH range, but it has little effect on chalcopyrite flotation. Flotation separation of a mixture of chalcopyrite and pyrite can be completed to obtain a copper concentrate grade up to 24.73% with a recovery of 80.36%. IR analysis shows that LSC and butyl xanthate compete in absorption on pyrite surface, and there exists an LSC characteristic peak on pyrite surface. There is little adsorption of LSC on chalcopyrite.

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In Situ and ex Situ Infrared Studies of Nature and Structure of Thiol Monolayers Adsorbed on Cuprous Sulfide at Controlled Potential

Cited by 53 publications

References 0 publications

Real Time Evaluation of Composition and Structure of Concanavalin A Adsorbed on a Polystyrene Surface

Real Time Evaluation of Composition and Structure of Concanavalin A Adsorbed on a Polystyrene Surface

Temperature effect on xanthate sorption by chalcopyrite

Effect of organic depressant lignosulfonate calcium on separation of chalcopyrite from pyrite

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