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Temperature-driven phase transitions in oligo(ethylene glycol)-terminated self-assembled monolayers
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics .
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden Linkoping Univ, Div Appl Phys, S-58183 Linkoping, Sweden Linkoping Univ, Div Chem, S-58183 Linkoping, Sweden.
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2000 (English)In: JOURNAL OF PHYSICAL CHEMISTRY B, ISSN 1089-5647, Vol. 104, no 32, 7565-7569 p.Other (Other academic)
Abstract [en]

This letter explores the phase behavior of oligo(ethylene glycol) self-assembled monolayers using temperature-programmed infrared reflection absorption spectroscopy. The monolayers are formed by self-assembly of hexa(ethylene glycol) (EG(6)) and tetra(ethylene glycol) (EG(4))-terminated and amide group containing alkanethiols on polycrystalline gold. The ethylene glycol portions of the two monolayers are known to exist in two different conformations at room temperature: EG(6) in helical and EG(4) in all-trans (zigzag). The helical phase of the EG(6) gradually diminishes upon increasing the temperature and a pronounced conformational transition occurs around 60 degrees C, leading to a rapidly increasing population of all-trans conformers along the EG(6) chain. The EG(4) SAM exhibits a much simpler phase behavior. The oligomer conformation is marginally affected upon increasing the temperature to 75 degrees C, displaying the dominating all-trans phase, which possibly coexists with a small fraction of gauche-rich (disordered) regions. The reported conformational changes are reversible upon returning to 20 degrees C after stepwise heating to 70 degrees C.

Place, publisher, year, pages
2000. Vol. 104, no 32, 7565-7569 p.
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Engineering and Technology
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URN: urn:nbn:se:liu:diva-49622OAI: oai:DiVA.org:liu-49622DiVA: diva2:270518
Available from: 2009-10-11 Created: 2009-10-11

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Valiokas, RamunasÖstblom, MattiasLiedberg, Bo

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