The Library
Kinetics of bromine transfer across Langmuir monolayers of phosphatidylethanolamines at the water/air interface
Tools
UNSPECIFIED (2003) Kinetics of bromine transfer across Langmuir monolayers of phosphatidylethanolamines at the water/air interface. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 5 (18). pp. 3979-3983. doi:10.1039/b306518a ISSN 1463-9076.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://dx.doi.org/10.1039/b306518a
Abstract
The kinetics of Br-2 transfer across phosphatidylethanolamine monolayers at the water/air (W/A) interface have been investigated using scanning electrochemical microscopy-double potential step chronoamperometry (SECM-DPSC). An homologous series of three phosphatidylethanolamines was considered: L-alpha-phosphatidylethanolamine dilauroyl (DLPE), L-alpha-phosphatidylethanolamine dipalmitoyl (DPPE) and L-alpha-phosphatidylethanolamine distearoyl (DSPE). The SECM-DPSC approach involved positioning a submarine ultramicroelectrode close to a monolayer assembled at the W/A interface at a defined and controllable surface pressure. Br-2 was produced in an initial (forward) potential step, by the diffusion-controlled oxidation of Br-, and then collected by diffusion-controlled reduction in a second (reverse) potential step. The resulting current-time behaviour provided information on both the tip-interface separation (forward step response) and the kinetics of Br-2 transfer (reverse step response). DSPE monolayers were found to diminish the rate of Br-2 transfer across the W/A interface, with the rate constant decreasing as the surface pressure increased. These experimental data were interpreted using a simple energy barrier model. In contrast, monolayers of DLPE and DPPE had no detectable effect on Br-2 transfer kinetics on the SECM time scale.
Item Type: | Journal Article | ||||
---|---|---|---|---|---|
Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
||||
Journal or Publication Title: | PHYSICAL CHEMISTRY CHEMICAL PHYSICS | ||||
Publisher: | ROYAL SOC CHEMISTRY | ||||
ISSN: | 1463-9076 | ||||
Official Date: | 15 September 2003 | ||||
Dates: |
|
||||
Volume: | 5 | ||||
Number: | 18 | ||||
Number of Pages: | 5 | ||||
Page Range: | pp. 3979-3983 | ||||
DOI: | 10.1039/b306518a | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |