The Impact of Polyacrylamide Molecular Weight on Its Adsorption Behavior at the Gold/Acidic Solution Interface

Adsorption isotherms for polyacrylamide (PAA) on polycrystalline gold, from sulfuric acid (potential range 0-2.0 V/she; 293 K), were obtained by means of cyclic voltammetry with simultaneous monitoring of the double-layer capacity. The Frumkin isotherm indicates that relatively strong attractive forces are present (a = 0.8-1.0), and the Gibbs energies range between 43 and 56 kJ mol-1. The coverage (q) of the metal surface with polymer molecules depends on the molar concentration of PAA, as well as on its molecular weight, and the size of the statistical polymer coil in the solution (RG = 7.49 \times 10-3 \times Mn0.64/nm). The adsorption coefficient B also strongly depends on the polymer molecular weight (B = k Mna), indicating, once more, that the size of the polymer coil and its conformation at the metal surface and/or in solution are the main factors determining the polymer adsorption at the metal/solution interface.

The Impact of Polyacrylamide Molecular Weight on Its Adsorption Behavior at the Gold/Acidic Solution Interface

Adsorption isotherms for polyacrylamide (PAA) on polycrystalline gold, from sulfuric acid (potential range 0-2.0 V/she; 293 K), were obtained by means of cyclic voltammetry with simultaneous monitoring of the double-layer capacity. The Frumkin isotherm indicates that relatively strong attractive forces are present (a = 0.8-1.0), and the Gibbs energies range between 43 and 56 kJ mol-1. The coverage (q) of the metal surface with polymer molecules depends on the molar concentration of PAA, as well as on its molecular weight, and the size of the statistical polymer coil in the solution (RG = 7.49 \times 10-3 \times Mn0.64/nm). The adsorption coefficient B also strongly depends on the polymer molecular weight (B = k Mna), indicating, once more, that the size of the polymer coil and its conformation at the metal surface and/or in solution are the main factors determining the polymer adsorption at the metal/solution interface.

___

  • A.K. Chakraborty and M. Tirrell, MRS Bulletin, 21, 1 (1996).
  • M.R. Porter, “Recent Developments in the Technology of Surfactants”, ed. M.R. Porter, Ch. 6, Elsevier Applied Science, New York, 1990.
  • Patent office-London, Patent SpeciŞcation 1,133,382 (1966).
  • M. Kawaguchi, Sh. Hattorri and A. Takahashi, Macromolecules, 20, 178 (1987).
  • R.S. Goucalves, J.M. Leger and C. Lamy, Electrochim. Acta, 34, 433 (1989).
  • T. Grchev, M. Cvetkovska, T. StaŞlov and J.W. Schultze, Electrochim. Acta, 36, 1315 (1991).
  • S. Muralidharan, K.L.N. Phani, S. Pitchumani, S. Ravichandran and S.V.K. Iyer, J. Electrochem. Soc., , 1478 (1995).
  • S.S. Abd El Rehim, F.M. Tohamy and M.M. Seleet, Surface Technology, 21, 169 (1984).
  • K. Aramaki and T. Shimura, Corros.Sci., 48, 209 (2006).
  • M.M. Lorengel, K. Schubert and J.W. Schultze, Werkst. Korros., 32, 13 (1981).
  • P.S. Germain, W.G. Pell and B.E. Conway, Electrochim. Acta, 49, 1775 (2004).
  • M. Tian, W.G. Pell and B.E. Conway, Electrochim. Acta, 48, 2675 (2003).
  • O.J. Murphy and J.S. Wainwright, J. Electrochem. Soc., 135, 138 (1988) and Langmuir, 5, 519 (1989).
  • M.J. Sottomayor and F. Silva, J. Electronal. Chem., 376, 59 (1994).
  • B. Piela and P.K. Wrona, J. Electronal. Chem., 388, 69 (1995).
  • M. Cvetkovska, T. Grchev, M. Lazarevich and D. Chamovska, J. Serb. Chem. Soc., 57, 615 (1992).
  • D. Chamovska, M. Cvetkovska and T. Grchev, Bull. Chem. Technol. Macedonia, 18, 187 (1999).
  • G.D. ParŞtt and C.H. Rochester, “Adsorption from Solution at the Solid/Liquid Interface”, Ch. 4, Academic Press Inc., London, 1983.
  • J. Lipkowski and L. Stolberg, “Adsorption of Molecules at Metal Electrodes”, J. Lipkowski and P.N. Ross, eds. pp. 216-232, VCH Publishers Inc., New York, 1992.
  • F.D. Koppitz, J.W. Schultze and D. Rolle, J. Electroanal. Chem., 170, 5 (1984).
  • E. Collinson, F.S. Daiton and G.S. McNaughton, Trans. Faraday. Soc. 53, 489 (1957).
  • Yu.S. Lipatov and L.M. Sergeeva, “Adsorption of Polymers”, Ch. 3, John Wiley & Sons, New York, 1974.
  • T. Schwartz, J. Francois and G. Weill, Polymer, 21, 247 (1980).
  • Lj. Arsov, T. Grcev, M. Cvetkovska and Gj. Petrov, Bull. Soc. Chim. Beograd, 48, 417 (1983).
  • A. Takahashi, M. Kawaguchi, K. Hayashy and T. Kato in: “Polymer Adsorption and Dispersion Stabil- ity”, Amer. Chem. Soc., 39-51 (1984).
Turkish Journal of Chemistry-Cover
  • ISSN: 1300-0527
  • Yayın Aralığı: Yılda 6 Sayı
  • Yayıncı: TÜBİTAK
Sayıdaki Diğer Makaleler

Synthesis of 1-Cyclohept-1,2-dien-1-yl benzene from 1-(2-iodo-, chlorocyclohept-1-en-1yl) benzene and 1-(2-iodo-, chlorocyclohept-2-en-1yl) benzene: Its trapping with diphenylisobenzofuran

Mustafa CEYLAN, Yakup BUDAK, Esra FINDIR, M. Burcu GÜRDERE, Murat ULUKAYA

Template Synthesis and Structural Characterization of Homo Binuclear Chromium(III), Manganese(III), Iron(III), Cobalt(III), and Ruthenium(III) Complexes with Octaazamacrocyclic Ligands

Vinod K. SHARMA, Shipra SRIVASTAVA

The Impact of Polyacrylamide Molecular Weight on Its Adsorption Behavior at the Gold/Acidic Solution Interface

Dragica B. CHAMOVSKA, Toma P. GRCHEV, Maja V. CVETKOVSKA

Hydrothermal and microwave-assisted synthesis of boroarsenate, $BAsO_4$

Abdulhadi BAYKAL, Ayten EVREN

Hydrothermal and Microwave-Assisted Synthesis of Boroarsenate, BAsO4

Abdulhadi BAYKAL, Ayten EVREN

Simple Synthesis of a -Oxime Derivatives of 2-Ketomethyl Quinolines under Mild and Heterogeneous Conditions

Javad SAFARI, Mehdi ADIB, Firouzeh SHEIBANI

Synthesis of 1-Cyclohept-1,2-dien-1-yl Benzene from 1-(2-iodo-, chlorocyclohept-1-en-1-yl)benzene and 1-(2-iodo-, chlorocyclohept-2-en-1-yl)benzene: Its Trapping with Diphenylisobenzofuran

Mustafa CEYLAN, Yakup BUDAK, Murat ULUKAYA

Synthesis, spectroscopic (FT-IR, $^1 H$, $^13 C$, Mass spectrometry), and biological investigation of five-coordinated germanium-substituted tricyclohewyl antimony dipropionates: Crystal structure of tricyclohexylantimony dipromide

Muhammad Kaleem KHOSA, Kieran C. MOLLOY, Sarim DASTGIR, Farkhanda SHAHEEN, Saqib ALI, Muhammad MAZHAR

A New Method for the Preparation of Pyridazine Systems: Experimental Data and Semiempirical PM3 Calculations

Dilek ÜNAL, Emin SARIPINAR, Yunus AKÇAMUR

Synthesis and Properties of Triazol-5-one Substituted Phthalocyanines by Microwave Irradiation

Bahittin KAHVECİ, Selami ŞAŞMAZ, Musa ÖZİL, Cihan KANTAR