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Journals / Manas Journal of Engineering / 2014 / Cilt: 2 - Sayı: 1

Surface pKa determination of benzoic acid modified gold electrode by electrochemical and contact angle measurement methods

Benzoik Asitle Modifiye Edilmiş Altın Elektrotun Yüzey pKa'sının Elektrokimyasal ve Temas Açısı Ölçüm Metotları ile Tayini

Ali SOLAK
Gamze ABACIOĞLU
Zafer ÜSTÜNDAĞ
Serkan DEMİRCİ
Aybüke TURAN
Haslet EKŞİ
Remziye GÜZEL
Sebahattin BALCI
Pages
3–15
Publication Date
2014-05-01
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Contact angle measurement (CAM) technique was also used to compare the accuracy of the surface pKa values acquired by electrochemical methods. pKa values for Au-BA were found as 2.938±0.283, 4.128 ± 0.342 and 4.251±0.089 by CV, EIS, and CAM, respectively : while the values are 4.084±0.101 5.326±0.323 and 5.102±0.147 for Au-NHBA.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:pKa values of the organic surfaces were determined with ionizable carboxylic acid groups, obtained by the modification of gold electrode by reduction of p-benzoic acid diazonium tetrafluoroborate and oxidation of p-aminobenzoic acid.
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Key Findings & Data:Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques were used in the surface pKa determination, by exploiting the barrier effect arising from the charged nature of the surface against the electrochemistry of Fe(CN)64-/3- redox probe.
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Conclusion & Impact:Contact angle measurement (CAM) technique was also used to compare the accuracy of the surface pKa values acquired by electrochemical methods. pKa values for Au-BA were found as 2.938±0.283, 4.128 ± 0.342 and 4.251±0.089 by CV, EIS, and CAM, respectively : while the values are 4.084±0.101 5.326±0.323 and 5.102±0.147 for Au-NHBA.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Benzoik asitin yüzey pKa · modifiye altın elektrot · dönüşümlü voltametri

Abstract

pKa values of the organic surfaces were determined with ionizable carboxylic acid groups, obtained by the modification of gold electrode by reduction of p-benzoic acid diazonium tetrafluoroborate and oxidation of p-aminobenzoic acid. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques were used in the surface pKa determination, by exploiting the barrier effect arising from the charged nature of the surface against the electrochemistry of Fe(CN)64-/3- redox probe. Contact angle measurement (CAM) technique was also used to compare the accuracy of the surface pKa values acquired by electrochemical methods. pKa values for Au-BA were found as 2.938±0.283, 4.128 ± 0.342 and 4.251±0.089 by CV, EIS, and CAM, respectively : while the values are 4.084±0.101 5.326±0.323 and 5.102±0.147 for Au-NHBA.

Özet

p-Benzoik asit diazonyum tuzunun altın elektrot yüzeyinde indirgenmesi ile p-amino benzoik asit tuzunun yükseltgenmesi sonucu elde edilen modifiye altın elektrot yüzeylerinin pKa değerleri iyonize olabilen karboksilik asit grupları ile tayin edilmiştir. pKa tayini için dönüşümlü voltametri (CV) ve elektrokimyasal empedans spektroskopisi (EIS) teknikleri kullanılmıştır. Redoks probu olarak Fe(CN)64-/3- kullanılmıştır. Elektrokimyasal tekniklerle belirlenen pKa değerlerini karşılaştırmak amacıyla temas açısı ölçümleri (CAM) yapılmıştır. Au-BA için pKa değerleri CV, EIS ve CAM teknikleri ile sırasıyla 2.938±0.283, 4.128 ± 0.342 ve 4.251±0.089 ve Au-NHBA için ise yine sırasıyla 4.084±0.101 5.326±0.323 ve 5.102±0.147 olarak bulunmuştur

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Cite This Article

SOLAK, A., ABACIOĞLU, G., ÜSTÜNDAĞ, Z., DEMİRCİ, S., TURAN, A., EKŞİ, H., GÜZEL, R., BALCI, S. (2014). Surface pKa determination of benzoic acid modified gold electrode by electrochemical and contact angle measurement methods. Manas Journal of Engineering, Cilt: 2 - Sayı: 1, 3–15. https://ajindex.com/articles/687288

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