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Dr. Weijia Wen 温维佳 Professor
Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong
Tel: (852)-23587979 Fax: (852)-23581652 Email: phwen@ust.hk
Professor Wen's main research interests include soft condensed matter physics, electrorheological (ER) and magnetorheological (MR) fluids, field-induced pattern and structure transitions, micro- and nano-fluidic controlling, microsphere and nanoparticle fabrications, thin film physics, band gap materials, metamaterials and nonlinear optical materials. |
Microfluidic Devices; Micro- Nano-fabrications | ||
Microfluidic devices are new generation micro-chips which will be widely used in Bio-microchip, Chemical reaction technology, lab-on-a-chip and other research areas. Our microfluidic devices are mostly associated with ER techniques developed recently in our laboratory. The merits of which are its fast response time, digitalization, easily controlling, and good reliability. |
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Nanofluidic Mixing (Appl. Phys. Lett) Single Nucleotide Polymorphism detection (Biomedical Microdevices) DNA detection in microfluidic chip-based assays (Microchim Acta) Three-dimensional thermal mapping within microfluidic chip (Scientific Reports) Micro-reaction with microfluidic chip (Analytical Chemistry) Universal logic gate from hybrid divider (Lab on Chip) Interchangeable Micro-PCR device (Biomedical Microdevices) Cell Micro-patterning (RSC Advances) Local Contact Angle on a Heterogeneous Surface (Langmuir) Logic gate with smart colloid (Lab on a Chip) Wax-bonding Microfluidic Chips (Lab on a Chip) "3D microfluidic chips" (Lab on a Chip) "Smart Window" (Appl. Phys. Lett.) Smart droplets (Soft Matters) Core-shell microspheres (Advanced Functional Materials) PDMS Conducting composite ( Advanced Materials) Micro thermo-indicator for microfluid (Appl. Phys. Lett.) Micro-heater (Appl. Phys. Lett.) Microfluidic pump (Appl. Phys. Lett.) Hybrid microfluidic mixer (Phys. Rev. Lett.) ER fluid-based flexible platform (Appl. Phys. Lett.) |
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Microspheres and Nanoparticles | ||
The
team in UST initiated the development of techniques to fabricate
multiply-coated microspheres with different desired properties. In
addition to its utility in ER suspensions, such microspheres also provide
a new tool for basic research in condensed matter physics.
SiO2 nanoparticles for photocatalysis
(Nanoscale)
Honeycomb structural microspheres (Small) (Chem. Comm.)Multi-core microspheres (Langmuir) Magnetically responsive microspheres (Appl. Phys. Lett.) Interaction between two magnetic microspheres (Appl. Phys. Lett.) The Significant Improvement of ER Fluids in 1997 by Using Multilayer-Coated Microspheres (Phys. Rev. Lett.) A Novel Class of Planar Magnetic Colloidal Crystals (Phys. Rev. Lett.) |
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Functional Materials: Fractal Photonics; Metamaterials | ||
A specific class of planar conducting fractals possesses a series of self-similar resonances, leading to multiple gaps and pass bands for electromagnetic waves over an ultra-wide frequency range. The important feature of this material is that it exhibits not only the tunable multiple bands but also subwavelength properties in lateral dimensions, as well as simulates the functions usually exhibited by three-dimensional photonic crystals. |
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Optical conductivities and signatures of topological insulators
(Phys. Rev. B) Thermal coherence properties of topological insulator (Phys. Rev. B) Subwavelength polarization rotators (Optics Letters) Resonant waveguide sensing (Biomedical Optics Express) Fano Effect --Terahertz extraordinary transmission (Appl. Phys. Lett.) Resonant terahertz transmissions (Optics Express) "Fractal THz Antenna" (Appl. Phys. Lett.) (Phys. Rev. Lett.)Resonances-induced transmission (Optics Express)Acoustic wave transmission through bull's eye structure (Appl. Phys. Lett.) 3D H-fractal and its photonic bandgap properties (Phys. Rev. B)Surface resonant-states-enhanced acoustic wave tunneling (Phys. Rev. Lett.) Acoustic and EM wave Metamaterials (Phys. Rev. B) Surface electric field determination of hole array (Appl. Phys. Lett.) Fluid-solid composite (Phys. Rev. Lett.) Negative refractive index effect for EM wave tunneling (Appl. Phys. Lett.) Resonant transmission of EM wave through a metal plate (Phys. Rev. B) Electromagnetic wave tunneling (Phys. Rev. Lett) Movie Metallic planar fractal with photonic band gaps in microwave (Phys. Rev. Lett.) |
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Optical Materials and Thin films | ||
Optical materials with large third-order nonlinear susceptibility, χ(3), are essential for light-controlled phase and refractive index modulation for future applications in optical computing, real-time holography, optical correlators and phase-conjugators. The nonlinear composite materials with χ(3) up to ~105esu. Photoluminescence from Au nanoparticles (J. Opt. Soc. Am. B) Multilayer gold nanoparticle-doped thin film (J. Opt. Soc. Am. B) Optical nonlinearity of nanocrystalline Au/ZnO Composite Films (Optics Letters) Preparation and characterization of Au/SiO2 multilayer composite films with nonspherical Au particles (Appl. Phys. A ) |