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  • AIP Publishing  (8)
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  • AIP Publishing  (8)
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  • 1
    Online Resource
    Online Resource
    Real-time detection, control, and sorting of microfluidic droplets
    AIP Publishing ; 2007
    In:  Biomicrofluidics Vol. 1, No. 4 ( 2007-12-01)
    Details
    In: Biomicrofluidics, AIP Publishing, Vol. 1, No. 4 ( 2007-12-01)
    Abstract: We report the design and implementation of capacitive detection and control of microfluidic droplets in microfluidic devices. Integrated microfluidic chip(s) with detection/control circuit enables us to monitor in situ the individual volume of droplets, ranging from nanoliter to picoliter, velocity and even composition, with an operation frequency of several kilohertz. Through electronic feedback, we are able to easily count, sort, and direct the microfluidic droplets. Potential applications of this approach can be employed in the areas of biomicrofluidic processing, microchemical reactions as well as digital microfluidics.
    Type of Medium: Online Resource
    ISSN: 1932-1058
    URL: Article
    DOI: 10.1063/1.2795392
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 2265444-6
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Electrorheological fluid-actuated flexible platform
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 88, No. 17 ( 2006-04-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 88, No. 17 ( 2006-04-24)
    Abstract: The design, fabrication, and performance of an electrorheological (ER) fluid-actuated flexible platform integrated on a microfluidic chip are reported in this letter. The digitally regulated ER microvalves control the four diaphragms on which a platform is sustained. With electrical input signals, the platform can perform vibrations at tunable frequencies as well as generate complex leveling modes. The flexible platform can potentially act as a microdamper when its inputs are generated from a sensor, in combination with a feedback control system.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2196847
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Active microfluidic mixer chip
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 88, No. 15 ( 2006-04-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 88, No. 15 ( 2006-04-10)
    Abstract: We report the design and fabrication of a chaotic mixer based on the electrorheological (ER) fluid-controlled valves. The flow in the main channel is perturbed by liquid flow in orthogonal side channels, driven by hydrodynamic pulsating pumps. Each pulsating pump consists of a chamber with diaphragm plus two out-of-phase ER valves operating in a push-pull mode. All the valves, pumps, and mixing channels are integrated in one polydimethylsioxane chip. Mixing characteristics in the main channel are controlled by the strength and frequency of external electric fields applied on the ER fluid.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2195567
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Frequency dependence of a field-induced force between two high dielectric spheres in various fluid media
    AIP Publishing ; 2003
    In:  Journal of Applied Physics Vol. 94, No. 12 ( 2003-12-15), p. 7832-7834
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 94, No. 12 ( 2003-12-15), p. 7832-7834
    Abstract: The frequency dependence of the interaction force f between two identical SrTiO3 spheres has been investigated in various carrying media with different dielectric constants under ac electric field strengths E0. We note that the force f is proportional to E02 and increases with the frequency regardless of the carrying media. The force however, is found to be stronger than that expected theoretically when the interspherical gap is small. The experimental results demonstrate that it is the conductivity that dominates the interaction force at low frequency, while dielectric polarization becomes more important at high frequency, and reveal that stronger interaction force between high dielectric spheres may be obtained in higher dielectric fluids when the frequency of the ac field is high enough. Some anomalous behaviors of f versus frequency are found when the two spheres are nearly touched.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.1626804
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2003
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Microheaters fabricated from a conducting composite
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 89, No. 22 ( 2006-11-27)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 89, No. 22 ( 2006-11-27)
    Abstract: The authors report the fabrication of microheaters based on a conducting composite of silver microparticles embedded in polydimethylsioxane (PDMS). Experimental results show that the microheaters exhibit good performance in temperature rise and decay characteristics, with localized heating at targeted spatial domains. A unique feature of the microheater here is its excellent integration capability with biocompatible PDMS and other polymer materials, with potential microchip applications for bioprocessing and chemical reactions.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2400065
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Magnetically responsive elastic microspheres
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 92, No. 1 ( 2008-01-07)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 92, No. 1 ( 2008-01-07)
    Abstract: We report the design, fabrication, and characterization of magnetically responsive elastic microspheres consisting of polydimethylsioxane (PDMS) and magnetic nano-/microparticles. The microspheres can have either core-shell or solid structure, fabricated by using a microfluidic technique. The mechanical characteristics are determined with a modified electronic balance, and the results show that the microspheres exhibit magnetostrictive effect. Such microspheres can in addition behave as a smart material controllable through an external magnetic field. Owing to the transparency, biocompatibility and nontoxicity of PDMS, the magnetically responsive elastic microspheres may have potential applications in drug delivery, biosensing, bioseparation, and medical diagnosis.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2830620
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Electrorheological-fluid-based microvalves
    AIP Publishing ; 2005
    In:  Applied Physics Letters Vol. 87, No. 24 ( 2005-12-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 87, No. 24 ( 2005-12-12)
    Abstract: We present the successful design and fabrication of push-and-pull microvalves that use a giant electrorheological (GER) fluid. Our multilayer microvalves, including the GER fluid control channel, the electrode, the flow channel, and the flexible membrane, are fabricated with polydimethylsioxane-based materials by soft lithography techniques. The GER effect is able to provide high-pressure changes in GER control channel so as to fully close and open an associated flow channel. The fast response time of the GER fluid and the push-and-pull valve design adopted assure fast switching time of the valve less than 10ms and sound reliability. This GER-fluid-based microvalve has other advantages of easy fabrication and biocompatibility and is suitable for most microfluidic applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2140070
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 8
    Online Resource
    Online Resource
    Electrorheological fluid-actuated microfluidic pump
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 89, No. 8 ( 2006-08-21)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 89, No. 8 ( 2006-08-21)
    Abstract: The authors report the design and implementation of an electrorheological (ER) fluid-actuated microfluidic pump, with programmable digital control. Our microfluidic pump has a multilayered structure fabricated on polydimethylsiloxane by soft-lithographic technique. The ER microfluidic pump exhibits good performance at high pumping frequencies and uniform liquid flow characteristics. It can be easily integrated with other microfluidic components. The programmable control also gives the device flexibility in its operations.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2337877
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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