Thermal behaviour and adsorption properties of some benzothiazole derivatives

Samide, Adriana; Rotaru, P.; Ionescu, Cătălina; Tutunaru, Bogdan; Moanță, Anca; Barragan‐Montero, Véronique

doi:10.1007/s10973-014-3644-3

Cited by 19 publications

(11 citation statements)

References 40 publications

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“…The fitting of the degree of surface coverage (θ) values with the maximum regression coefficient (R 2 ) enables the accurate determination of the adsorption-desorption equilibrium constant (K), and then the calculation of the standard adsorption free energy (∆G 0 ads ) [20][21][22][23][24][25][26][27][28]. In our study, the experimental data were successfully fitted by applying the Langmuir adsorption isotherm (Figure 3a), its linearized form being expressed by Equation (8) [27]:…”

Section: Nms Adsorption Mechanismmentioning

confidence: 99%

Inhibitory Properties of Neomycin Thin Film Formed on Carbon Steel in Sulfuric Acid Solution: Electrochemical and AFM Investigation

et al. 2017

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Abstract:Our study aims to implement a strategy to reduce the carbon steel corrosion rate in a sulfuric acid solution, using an expired drug with adsorption affinity on the metal surface. To investigate the corrosion protection efficiency of an environmental friendly inhibitor, namely neomycin sulfate (NMS), the electrochemical measurements were applied on carbon steel immersed in 1.0 M H 2 SO 4 solution with and without NMS. The protective layer that formed on the steel surface was studied by atomic force microscopy (AFM). The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) showed that the presence of the neomycin sulfate in acid solution leads to the decrease in corrosion current density (i corr ) and the increase of polarization resistance (R p ). The mixed mechanism between physical and chemical adsorption of NMS molecules on the steel surface was proposed according to the Langmuir adsorption isotherm. AFM indicated that the NMS molecules contributed to a protective layer formation by their adsorption on the steel surface. The AFM parameters, such as root mean square roughness (R q ), average roughness (R a ), and maximum peak to valley height (R p−v ) revealed that in the presence of NMS a smoother surface of carbon steel was obtained, compared to the steel surface corroded in sulfuric acid blank solution.

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Section: Nms Adsorption Mechanismmentioning

confidence: 99%

Inhibitory Properties of Neomycin Thin Film Formed on Carbon Steel in Sulfuric Acid Solution: Electrochemical and AFM Investigation

et al. 2017

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“…Quantitatively, the adsorption can be evaluated using the adsorption isotherms, for example, Lamgmuir, Temkin, and Freundlich, which allow to calculate the adsorption–desorption constants and standard free energy of adsorption, knowing that the threshold of −40.0 kJ mol −1 represents the limit between physical and chemical adsorption …”

Section: Introductionmentioning

confidence: 99%

Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Samide

Brãtulescu

Merişanu

et al. 2018

J of Applied Polymer Sci

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The poly(vinyl acetate) (PVAC) film was obtained by electropolymerization on the copper electrode using cyclic voltammetry performed in mixed electrolyte based on water/ethyl alcohol/acetic acid containing vinyl acetate (VAc) and benzoyl peroxide as polymerization initiator. The coatings were characterized by optical microscopy, scanning electron microscopy (SEM) and infrared (IR) spectroscopy. The corrosion was induced in hydrochloric acid solution using potentiodynamic measurements and electrochemical impedance spectroscopy (EIS). The microscopic and SEM images revealed the PVAC coating formation and IR spectroscopy confirmed that it exhibits the same characteristic bands as a standard PVAC sample. From the potentiodynamic polarization, the PVAC protective performance of 78% was computed. The EIS measurements showed the occurrence of the surface adsorbed layer with a higher impedance response to the frequency and a phase angle maximum shifted to lower values than those of uncoated samples. In addition, the VAc electropolymerization mechanism was discussed and the PVAC adsorption mechanism on the copper surface was proposed. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47320.

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“…In previous our studies we reported the results of our research on the electrochemical stability of some drugs, and of some dyes, as follows: metronidazole, benzocaine, hematoxylin, Brilliant Blue, Methylene blue, Methyl blue, Methylorange .…”

Section: Introductionmentioning

confidence: 99%

Interactions between Vitamin C and Nanocolloidal Silver Particles Studied by Cyclic Voltammetry and UV‐Vis Spectrophotometry

Samide

Tutunaru

2017

Electroanalysis

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The effect of silver nanoparticles on human health has been investigated and the controversial opinions about their use in a wide variety of commercial products were expressed. Their interactions with vitamins and salts constitute an important step to elucidate the possible improper transformations knowing that the silver nanoparticles could have the effect on cell viability. In this circumstance, in our study we investigated the electrochemical behavior of ascorbic acid, in NaCl blank solution and NaCl solution containing the silver nanoparticles using the cyclic voltammetry and current constant electrolysis associated to UV‐Vis spectrophotommetry. The presence of silver nanoparticles (nAg) leads to a more rapid electrodegradation of vitamin C (VitC) in solution of NaCl, the zero‐order reaction kinetics being followed. The rate constant value of 0.78 u.A. min−1 was obtained compared to the value of 0.39 u.A. min−1 that was computed in the absence of nAg. The Vitamin C degradation mechanism was also proposed.

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Thermal behaviour and adsorption properties of some benzothiazole derivatives

Cited by 19 publications

References 40 publications

Inhibitory Properties of Neomycin Thin Film Formed on Carbon Steel in Sulfuric Acid Solution: Electrochemical and AFM Investigation

Inhibitory Properties of Neomycin Thin Film Formed on Carbon Steel in Sulfuric Acid Solution: Electrochemical and AFM Investigation

Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Interactions between Vitamin C and Nanocolloidal Silver Particles Studied by Cyclic Voltammetry and UV‐Vis Spectrophotometry

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