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Generation of Free-Form Dynamic Temperature Gradients in a Disposable Microchip
Byung Hang Ha(하병항),Jinsoo Park(박진수),Ghulam Destgeer(굴람 데스기어),Jin Ho Jung(정진호),Hyung Jin Sung(성형진) 한국가시화정보학회 2015 한국가시화정보학회 학술발표대회 논문집 Vol.2015 No.12
We present a temperature gradient (TG) generation method using acoustothermal heating of polydimethylsiloxane (PDMS) by surface acoustic wave (SAW) microfluidic system. Independent and precise control of each SAW from a slanted-finger interdigital transducer (SIDT) enables a one-dimensional (1D) spatiotemporal control of temperature in a PDMS microchip. Various TGs were created in solid, gas and liquid. In contrast to prior works, the system creates switchable, dynamic and free-form TGs in a disposable microchip. As an application, one-shot high-resolution DNA melting curve analysis was performed to detect single nucleotide polymorphism (SNP).
미세 유체 플랫폼에서의 광력을 이용한 액적의 연속적인 제어 기술의 개발
정진호(Jin Ho Jung),조현준(Hyunjun Cho),하병항(Byung Hang Ha),Ghulam Destgeer,성형진(Hyung Jin Sung) 한국가시화정보학회 2014 한국가시화정보학회지 Vol.12 No.2
In the present study, the optofluidic droplet manipulation in a microfluidic platform was demonstrated via theoretical and experimental approaches. Optical scattering force and gradient force were used to separate and trap droplets. Two types of droplets were generated by a T-junction method in the microfluidic channel. While they approach a test region where the optical beam illuminates the droplets, they were pushed by the optical scattering beam. The displacement by the laser beam is dependent on the refractive index of the droplets. By using the optical gradient force, the droplets can be trapped and coalesced. In order to bring the droplets in a direct contact, the optical gradient force was used to trap the droplets. A theoretical modeling of the coalescence was derived by combining the optical force and drag force on the droplet.