Facile Phase Transition Measurements for Nanogram Level Liquid Samples Using Suspended Microchannel Resonators
SCIE
SCOPUS
- Title
- Facile Phase Transition Measurements for Nanogram Level Liquid Samples Using Suspended Microchannel Resonators
- Authors
- Minhyuk Yun; Il Lee; Jeon, S; Jungchul Lee
- Date Issued
- 2014-03
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Abstract
- We investigated phase transitions of a PEO-PPOPEO triblock copolymer and n-heptadecane using a suspended microchannel resonator (SMR). After filling the microchannel of the SMR with each sample in liquid state, changes in the resonance frequency of the SMR were measured as a function of temperature, and then converted into changes in the density of each sample. As temperature increases, PEO-PPO-PEO unimers aggregate and form micelles (unimer-micelle transition), so the density of the polymer decreases and the resonance frequency of the SMR increases. As temperature decreases, n-heptadecane undergoes liquid to rotator phase (liquid-rotator transition), which increases the sample density and decreases the resonance frequency of the SMR. In addition, the liquid-rotator transition of n-heptadecane exhibits a sudden change in the quality factor of the SMR.
- Keywords
- Liquid-rotator transition; suspended microchannel resonator; unimer-micelle transition; OXIDE) TRIBLOCK COPOLYMERS; AQUEOUS-SOLUTIONS; SINGLE CELLS; MICELLIZATION; NANOPARTICLES; CANTILEVERS; BEHAVIOR; DENSITY; WATER; MASS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15084
- DOI
- 10.1109/JSEN.2013.2287887
- ISSN
- 1530-437X
- Article Type
- Article
- Citation
- IEEE SENSORS JOURNAL, vol. 14, no. 3, page. 781 - 785, 2014-03
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