Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Self-assembled monolayer gold electrode for surfactant analysis (1997)
    Springer
    Journal of solid state electrochemistry 1 (1997), S. 155-160 
    Details
    ISSN: 1433-0768
    Keywords: Key words Self-assembled monolayer ; Gold ; Surfactant ; Amperometry ; Flow injection analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A gold electrode coated with a self-assembled monolayer of octane-thiol (SAM/Au) has been used as an amperometric detector for the determination of surfactants. This detector operated in the presence of a high percentage of organic solvent and was adapted to an HPLC System. At the SAM/Au, the electrochemical response of an electroactive tracer (potassium ferricyanide) was completely inhibited, but, in the presence of a cationic surfactant, the electrochemical reduction was progressively restored. In flow injection analysis, using the SAM/Au in an amperometric flow-through detector polarised at 0.0 V vs Ag/AgCl, a linear response (i=f{[surfactant]}) was observed for cationic surfactants e.g. cetylpyridinium chloride in the concentration range 2 × 10−6–1 × 10−3 M. The electrochemical data along with the determination of the ion pair stoichiometry between the redox tracer and the surfactant suggest an electrochemical response related to ion pair formation and governed by electron transfer by tunneling effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100080050040
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Surfactant modified carbon paste electrode: Part 1: Electrochemical and microscopic characterization (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 451-458 
    Details
    ISSN: 1040-0397
    Keywords: Surfactant ; Carbon paste ; Modified etectrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The modification of the carbon paste electrode (CPE) with the amphiphile hexadecyl sulfonic acid (sodium salt) has permitted the development of a stable and analytically useful functionalized electrode. The electrochemical characterization of the modified electrode (potential range, background current, stability) has been investigated by cyclic voltammetry in aqueous media with different buffer compositions and in hydro-organic media and the results compared favorably with the conventional carbon paste electrode. The characterization of the sulfonated functionalities and their influence in the electrode behavior has been pointed out using linear scan and adsorptive voltammetry by studying two model compounds: promethazine and ascorbic acid. The marked influence of the pH, ionic strength, and nature of the buffer cation on the shape (potential and intensity) of the voltammetric curves confirmed the structure of the modified electrode interface, i.e., electrode bearing strong cation exchange functionalities. Scanning electron microscopy and optical microscopic observations of the CPE and modified CPE showed a higher density of graphite particles not covered by liquid paraffin at the latter.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060515
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Surfactant modified carbon paste electrode: Part 2: Analytical performances (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 459-462 
    Details
    ISSN: 1040-0397
    Keywords: Surfactant ; Modified electrode ; Carbon paste ; Drug analysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The hexadecylsulfonic acid (sodium salt) modified carbon paste electrode (HDSNa-CPE) has been studied in batch and flowing systems, and its analytical performance has been established in comparison with a conventional carbon paste electrode (CPE). Amperometry, linear scan, and preconcentration voltammetry have been used for the investigation of several analytes of pharmacological interest. Because of the presence of surface functionalities, markedly different electrode responses have been observed at the HDSNa-CPE depending on the nature (hydrophobicity and charge) of the investigated molecule. The HDSNa-CPE showed, in linear scan voltammetry and for all the species investigated, higher responses compared to the CPE. The HDSNa-CPE showed important current enhancements in voltammetric analysis of hydrophobic organic cations in acidic media and at low ionic strength.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060516
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...