CORROSION INHIBITION OF BENZOTRIAZOLE AND N-MESYL BENZOTRIAZOLE ON LOW CARBON STEEL IN SULFURIC ACID

This study examines usage of benzotriazole (Bt) and N-mesyl benzotriazole (BtSO₂CH₃) for im- provement of corrosion resistance of low carbon steel (LCS) in 0.1 M sulfuric acid (H₂SO₄). The inhibitor effect of Bt and BtSO₂CH₃ on the corrosion behavior of LCS was studied using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves and polarization resistance techniques. Under investigated experimental conditions these compounds showed a good corrosion inhibition. The inhibition efficiency of BtSO₂CH₃ was more than that of Bt. The potentiodynamic polarization curves indicated that compounds are mixed type inhibitors. The inhibiting properties of compounds were found to depend on the concentration. The adsorption mechanism of compounds was investigated using different adsorption isotherms. The equilibrium constants and free energies of adsorption using the adsorption isotherms were calculated

Uygulamalı Bilimler ve Mühendislik

Bu çalışma 0,1 M sülfürik asit içinde düşük karbon çeliğinin (LCS) korozyon direncini arttırmak için benzotriazol (Bt) ve yeni sentezlenen N-mesil benzotriazol (BtSO2CH3) kullanımını incelemektedir. LCS’nin korozyon davranışına karşı Bt ve BtSO2CH3’ün inhibitör etkisi, elektrokimyasal empedans spektroskopisi (EIS), potansiyodinamik polarizasyon eğrileri ve polarizasyon direnci teknikleri kullanılarak çalışılmıştır. Belirtilen deneysel koşullarda bu bileşikler iyi bir korozyon inhibisyonu göstermektedir. BtSO2CH3’ün inhibitör etkinliği, Bt’ün inhibitör etkinliğinden daha fazladır. Potansiyodinamik polarizasyon eğrileri bileşiklerin karma inhibitör olduğunu göstermektedir. Bileşiklerin inhibisyon özelliklerinin derişime bağlı olduğu bulunmuştur. Bileşiklerin adsorpsiyon mekanizmaları farklı adsorpsiyon izotermleri kullanılarak incelenmiştir. Aynı zamanda serbest enerji ve denge sabiti değerleri adsorpsiyon izotermlerinden hesaplanmıştı

Semi-synthetic biotin imprinting onto avidin crosslinked gold-silver nanoparticles

WOS:000305328900006This study is a different and new application of molecular imprinted polymers (MIPs) based on sensor technologies. In this study, semi-synthetic biotin imprinted polymeric shell has been decorated onto the surface of avidin crosslinked Au/Ag nanoclusters using bis (2-2'-bipyridyl) MATyr-MATrp-ruthenium(II) (MATyr-Ru-MATrp) as photosensitive monomer. The synthesized nanoclusters have been used the recognition of biotin by flourometric method. Synthesis of the photosensitive monomers has been realized by AmiNoAcid (monomer) Decorated and Light Underpinning Conjugation Approach (ANADOLUCA) method. This method provides a strategy for the preparation of photosensitive ruthenium based aminoacid monomers and oligomers, aminoacid monomer-protein crosslinking using photosensitation and conjugation approach on micro and nano-structures by ruthenium-chelate based monomers. The affinity constant (K-a) of biotin imprinted Au/Ag nanoclusters has been determined using the Scatchard method and found to be 3.89 x 10(5) M-1. The obtained calibration graph is linear for the range of 0.051 and 2.50 mu M of biotin. The detection limit of biotin has been found to be 15 nM. Also, the reusability of these nanoclusters has been investigated and it has been observed that the same clusters could be used 10 times during a long period without any binding capacity decreasing

Structural changes in a Schiff base molecular assembly initiated by scanning tunneling microscopy tip

We report the controlled self-organization and switching of newly designed Schiff base (E)-4-((4-(phenylethynyl) benzylidene) amino) benzenethiol (EPBB) molecules on a Au (111) surface at room temperature. Scanning tunneling microscopy and spectroscopy (STM/STS) were used to image and analyze the conformational changes of the EPBB molecules. The conformational change of the molecules was induced by using the STM tip while increasing the tunneling current. The switching of a domain or island of molecules was shown to be induced by the STM tip during scanning. Unambiguous fingerprints of the switching mechanism were observed via STM/STS measurements. Surface-enhanced Raman scattering was employed, to control and identify quantitatively the switching mechanism of molecules in a monolayer. Density functional theory calculations were also performed in order to understand the microscopic details of the switching mechanism. These calculations revealed that the molecular switching behavior stemmed from the strong interaction of the EPBB molecules with the STM tip. Our approach to controlling intermolecular mechanics provides a path towards the bottom-up assembly of more sophisticated molecular machines.TUBITAK (TBAG 112T507); Flemish Science Foundation (FWO-Vl); FWO Pegasus Long Marie Curie Fellowshi