Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Li Qin-Yi Last modified date:2021.05.10

Associate Professor / Thermophysics and Fluid Mechanics / Department of Aeronautics and Astronautics / Faculty of Engineering


Presentations
1. Qin-Yi Li, Koji Takahashi, Raman optothermal methods to measure interfacial thermal conductance of low-dimensional materials, The 59th Fullerenes-Nanotubes-Graphene General Symposium, 2020.09.
2. Qin-Yi Li, Manipulating conductive and convective heat transfer at the nanoscale, International Symposium on Numerical Methods in Heat and Mass Transfer 2020, 2020.12.
3. Qin-Yi Li, Toshiaki Kato, Xiulin Ruan, Koji Takahashi, Record-high thermoelectric performance of graphene, The 12th Asian Thermophysical Properties Conference (ATPC2019), 2019.10.
4. Qin-Yi Li, Toshiaki Kato, Xiulin Ruan, Koji Takahashi, Record-high thermoelectric performance of as-grown graphene nanoribbons, 16th UK Heat Transfer Conference (UKHTC2019), 2019.09.
5. Qin-Yi Li, Toshiaki Kato, Koji Takahashi, Enhanced thermoelectric performance of suspended graphene nanoribbons, ASME (American Society of Mechanical Engineers) 6th Micro/Nanoscale Heat and Mass Transfer International Conference, 2019.07.
6. Qin-Yi Li, Probing Interface Effect on Heat Conduction in Nanomaterials, International Joint Seminar on Mechanical Engineering 2019, 2019.11.
7. Qin-Yi Li, Record-high thermoelectric efficiency of graphene nanoribbons, 2nd International Symposium on Measurement Technology in Thermal Science and Engineering (MTTSE2019), 2019.11.
8. Qin-Yi Li, Enhancing thermoelectric efficiency of graphene via nanostructuring, 2nd Workshop on Thermal and Charge Transport across Flexible Nano-Interfaces (TCTFN2019), 2019.11.
9. Qin-Yi Li, Koji Takahashi, Xing Zhang, Heater Assisted Raman Method to Measure Interfacial Thermal Conductance in van der Waals Heterostructures, 16th International Heat Transfer Conference (IHTC16), 2018.08.
10. Qinyi Li, Koki Katakami, Tatsuya Ikuta, Masamichi Kohno, Xing Zhang, Koji Takahashi, Measurement of thermal contact resistance between individual carbon fibers using a transient Raman mapping method , The 7th International Symposium on Micro and Nano Technology, 2019.04.
11. Qin-Yi Li, Wakana Okita, Yohei Komori, Hiroo Suzuki, Toshiaki Kato, Toshiro Kaneko, Tatsuya Ikuta, Koji Takahashi, Extraordinary electronic contribution to thermal transport in free-standing graphene nanoribbons with low-disorder edges, Nanoscale and Microscale Heat Transfer VI (Eurotherm seminar No 111), 2018.12.
12. Qinyi Li, Xing Zhang, CO2 long term diffusive leakage into biosphere in geological carbon storage, 2012.10.
13. Qinyi Li, Zhang Xing, T-type Raman spectroscopy method for determining laser absorptivity, thermal conductivity and air heat transfer coefficient of micro/nano fibers, 2013.09.
14. Qinyi Li, Zhang Xing, Raman spectra method for determining viscosity of supercritical fluids, 2014.08, For supercritical fluids, viscosity determination is difficult by contact sensors because contact sensors may be affected by the high pressure, high temperature and distinctive properties of supercritical fluids. In this paper, a non-contact method is presented for determining viscosity of supercritical fluids based on the linear pressure dependence of fluid Raman spectra and the principles of laminar flow in rectangular micro channels. The pressure drop along a micro channel can be determined by mapping the Raman spectra along the channel and the flow rate can be simultaneously determined by mapping the pressures at adjacent locations with different cross areas based on the Bernoulli equation for gases. Thus, the fluid viscosity can be determined combined with the pressure drop and the flow rate. Cases of methane, carbon dioxide and hydrogen at various pressures and temperatures are simulated to analyze the sensitivity and uncertainty of this method. The total viscosity uncertainty for methane at 300 K and 10 MPa is 2.9%. The viscosity uncertainties for carbon dioxide at 313.15 K, 9 MPa and 313.15 K, 12 MPa are respectively estimated as 2.1% and 9.7%. For hydrogen, this method is most suitable at low temperatures. The viscosity uncertainty for hydrogen at 85 K and 5 MPa is 1.84% and increases to 24.1% at 315 K and 15 MPa. This Raman spectra method still remains to be experimentally validated..
15. Qinyi Li, Yudong Hu, Kailun Xia, Ji Zhang, Jinhui Liu, Yingying Zhang, Qunyang Li, Zhang Xing, Comprehensive measurement of the thermophysical properties of suspended and supported graphene using a systematic Raman spectroscopy method, 2016.10.
16. Qinyi Li, Xing Zhang, Comprehensive Raman spectroscopy method to measure thermal conductivity and thermal diffusivity of suspended and supported 1D nanomaterials, 2016.11.
17. Qinyi Li, Xing Zhang, Koji Takahashi, Dual-mode Raman method to measure in-plane and interfacial thermophysical properties of 2D van der Waals heterostructures, 2017.04.
18. Qinyi Li, Xing Zhang, Koji Takahashi, Dual-mode Raman method to measure thermal transport properties of 2D materials and van der Waals heterostructures, 2017.07.
19. Qinyi Li, Xing Zhang, Laser flash raman spectroscopy method for characterizing thermal diffusivity of suspended and supported 2D nanomaterials, ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2016, 2016.01, 2D nanomaterials have been attracting extensive research interests due to their superior properties and the accurate thermophysical characterization of 2D materials is very important for nanoscience and nanotechnology. Recently, a noncontact technique based on the temperature dependent Raman band shifts has been used to measure the thermal conductivity of 2D materials. However, the heat flux, i.e. the absorbed laser power, was either theoretically estimated or measured by a laser power meter with uncertainty, resulting in large errors in thermal conductivity determination. This paper presents a transient "laser flash Raman spectroscopy" method for measuring the thermal diffusivity of 2D nanomaterials in both the suspended and supported forms without knowing laser absorption. Square pulsed laser instead of continuous laser is used to heat the sample and the laser absorption can be eliminated by comparing the measured temperature rises for different laser heating time and laser spot radii. This method is sensitive for characterizing typical 2D materials and useful for nanoscale heat transfer research..