people in the group]
Positions open: We may
have positions for postdoc
fellows, graduate students, and undergraduate students. Please check here.
08/2016: Student award.
Prabudhya Roychowdhury joined our
group as a Ph.D. student. Prabudhya receives the Ross Fellowship
(a one-year fellowship) from the School of Mechanical Engineering.
08/2012: Welcome New
Students. Julian Alberts, Prabudhya Roychowdhury, and
Dedeepya Valluripally have joined our group. Welcome!
Invited Seminars. Dr. Ruan visited China and gave
invited seminars at Xi'an Jiaotong University, Tsinghua University,
North China University of Electric Power, Chinese Academy of
Sciences, Harbin Institute of Technology, and Huazhong
University of Science and Technology.
05/2016: PhD dissertation
Kelly successfully defended her PhD dissertation.
05/2016: PhD dissertation
Yan successfully defended his PhD dissertation and will join
the University of Nevada at Reno as a tenure-track assistant professor.
Congratulations to the soon-to-be Professor Wang!
05/2016: Student Award.
Zuyuan received the Magoon Award for Excellence in Teaching.
Sustainable energy and energy
efficiency are among the greatest challenges facing the society, and heat
transfer scientists and engineers can contribute. Solutions to these
challenges rely on extraordinarily fundamental and
innovative approaches. In our lab, we are developing
efficient energy and renewable energy technologies using the emerging nanotechnology.
The behavior of all energy systems
related to atomic-scale description. With an atomic-level
knowledge of the thermal energy carriers (photon, electron, phonon,
and fluid particle), one is
able to design nano- and micro-structures with
the desired size effects, or to synthesize new materials
with the desired functionalities. Our lab is building and expanding
the understanding of the fundamentals of atomic-level
carrier transport and interactions, and is applying this
knowledge to important applications for energy efficiency and electronics thermal
Current projects fall in two
nanoscale heat conduction, and nano-photonics (including nanoscale thermal radiation).
Projects in the nanoscale heat conduction (or
nano-phononics) category include: (1) high-performance nanostructured
thermoelectric materials for power generation and
thermoelectric refrigeration; (2) thermal transport and thermal
rectification in carbon nanotube and graphene for electronic
thermal management applications; (3) thermal
interface resistance across CNT (or graphene)-metal
interfaces for electronic thermal management applications. Projects in the nano-photonics category include: (4)
Suppression of electron-phonon
coupling in quantum dot solar cell materials for enhanced
efficiency; (5) Enhanced
optical absorption in silicon nanowire arrays for
potentially enhanced solar cell efficiency; (6) Multiscale control of
thermal radiation in ordered array of carbon nanotubes; (7)
enhanced laser cooling of semiconductors and ion-doped
projects involve theoretical, computational, and experimental
components. Currently our lab devotes 2/3 efforts to
theoretical and simulation studies, and 1/3 effort to
experimental work. Theoretical tools include heat transfer,
materials science, quantum mechanics,
solid state physics, optics, and electromagnetic theory. Computational
tools involve multiscale
simulation techniques of nanoscale energy transport,
including molecular dynamics simulations, first principles
simulations, and Boltzmann transport theory. Experiments
include fabrication of nanomaterials and devices, and
characterizations of these materials and devices using
advanced imaging and spectroscopy
techniques. Detailed information of our research can be
We have labs in both the
ME building and the
Birck Nanotechnology Center. We are also associated with
Energy Center at Purdue.
Most Recent Publications:
Li, W. Park, Y.P. Chen, and X.L. Ruan, “Effect of particle
size and aggregation on thermal conductivity of
J. Heat Transfer.
Z.F. Huang and X.L. Ruan, “Nanoparticle
embedded double-layer coating for daytime radiative
cooling”, Int. J. Heat Mass Transfer 104,
890-896 (2017). [PDF]
 Y. Wang, Z.X. Lu,
and X.L. Ruan, "First principles calculation of lattice
thermal conductivity of metals considering phonon-phonon and
phonon-electron scattering", J. Appl. Phys. 119 (22),
225109 (2016). [PDF]
 Z.Y. Wang and X.L.
Ruan, "Phonon spectral energy density analysis of solids:
The k point reduction in the first Brillouin zone of FCC
crystals and a case study on solid argon", Computational
121, 97-105 (2016). [PDF]
 S Sarbada, Z.F.
Huang, Y.C. Shin, and X.L. Ruan, "Low-reflectance
laser-induced surface nanostructures created with a
picosecond laser", Appl. Phys. A 122 (4), 1-10
 A.K. Vallabhaneni,
D. Singh, H. Bao, J.Y. Murthy, and X.L. Ruan, “Reliability
of Raman measurements of thermal conductivity of
single-layer graphene due to selective electron-phonon
coupling: a first principles study”, Phys. Rev. B 93, 125432
list of publications]
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updated 02/15/2016 · © Copyright Xiulin Ruan