Abstract ▼

□ Purpose& contents
Based on proof-of-concepts accomplished from our previous study on energy-on-chips by electrokinetic flows, the goal of this research is to highly enhance maximum power and relative energy conversion efficiency, by applying non-Newtonian effect of charged polyelectrolyte solut

□ Purpose& contents
Based on proof-of-concepts accomplished from our previous study on energy-on-chips by electrokinetic flows, the goal of this research is to highly enhance maximum power and relative energy conversion efficiency, by applying non-Newtonian effect of charged polyelectrolyte solution and time-periodic pulsatile flow in microchannel. 1st year's scope spans the depletion-layer effect of polyelectrolyte solution and pulsatile microflow, and 2nd year's scope is to mainly achieve the enhanced power and efficiency due to polyelectrolyte adsorbed-layer formed at channel wall.

□ Result
Rheological property of charged polyelectrolyte solution of polyacrylic acid (PAA) was characterized for different concentrations. We developed computation-design framework for electrokinetic microflow of non-Newtonian solutions including with either depletion layer or adsorbed-layer to predict the flow rate and streaming potential/current for given conditions. Energy conversion efficiency were evaluated from the power measured by using prototype chip fabricated with 10 channels. Efficiency really increases with increasing solution pH and PAA concentration, where 2,000 ppm PAA solution results in over 30 times increases in the efficiency compared to the case of non-PAA solution. Multi-layer chip designed with hierarchical structured multichannel was provided to get more enhanced power, and our computation framework was also extended to the pulsatile electrokinetic microflow, which can cover parameters of wall charge, solution properties, pressure drop, and so on. The correlation between relaxation time of polymer solution and pulsation period required a further study in the future.

□ Expected Contribution
Application challenges can be provided as self-power chip, nano locomotion, battery charger, and operating implantable medical devices. The new paradigm of combining pulsatile microfluidics and MEMS fabrications will make contributions to activate research on ubiquitous powers by human walking and biomimetic energy achievements. It will provide the foundation of clean energy without using organic chemicals, and an emergent technology possible to motivate the next-generated chemical and bio industry.

(출처 : SUMMARY 5p)

목차 Contents

• 표지 ... 1
• 목차 ... 2
• 연구계획 요약문 ... 3
• 연구결과 요약문 ... 4
• 한글요약문 ... 4
• SUMMARY ... 5
• 연구내용 및 결과 ... 6
• 1. 연구개발과제의 개요 ... 6
• 2. 국내외 기술개발 현황 ... 7
• 3. 연구수행 내용 및 결과 ... 8
• 4. 목표달성도 및 관련분야에의 기여도 ... 17
• 5. 연구결과의 활용계획 ... 18
• 6. 연구과정에서 수집한 해외 과학기술정보 ... 19
• 7. 주관연구책임자 대표적 연구실적 ... 19
• 8. 참고문헌 ... 20
• 9. 연구성과 ... 20
• 10. 국가과학기술지식정보서비스에 등록한 연구시설‧장비 현황 ... 25
• 11. 연구개발과제 수행에 따른 연구실 등의 안전조치 이행실적 ... 25
• 12. 기타사항 ... 26
• [별첨1] 대 표 연 구 실 적 ... 27
• [별첨2] 세부 목표 관련 증빙 ... 39
• 끝페이지 ... 50