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Lim, Yeongjin,Heo, Jeong-Il,Madou, Marc,Shin, Heungjoo Springer 2013 Nanoscale research letters Vol.8 No.1
<P>With the development of nanomaterial-based nanodevices, it became inevitable to develop cost-effective and simple nanofabrication technologies enabling the formation of nanomaterial assembly in a controllable manner. Herein, we present suspended monolithic carbon single nanowires and nanomeshes bridging two bulk carbon posts, fabricated in a designed manner using two successive UV exposure steps and a single pyrolysis step. The pyrolysis step is accompanied with a significant volume reduction, resulting in the shrinkage of micro-sized photoresist structures into nanoscale carbon structures. Even with the significant elongation of the suspended carbon nanowire induced by the volume reduction of the bulk carbon posts, the resultant tensional stress along the nanowire is not significant but grows along the wire thickness; this tensional stress gradient and the bent supports of the bridge-like carbon nanowire enhance structural robustness and alleviate the stiction problem that suspended nanostructures frequently experience. The feasibility of the suspended carbon nanostructures as a sensor platform was demonstrated by testing its electrochemical behavior, conductivity-temperature relationship, and hydrogen gas sensing capability.</P>
Sharma, Swati,Sharma, Ashutosh,Cho, Yoon-Kyoung,Madou, Marc AmericanChemical Society 2012 ACS APPLIED MATERIALS & INTERFACES Vol.4 No.1
<P>Single suspended carbon nanowires (CNWs) integrated oncarbon-MEMS(CMEMS) structures are fabricated by electrospinning of SU-8 photoresistfollowed by pyrolysis. These monolithic CNW-CMEMS structures enablefabrication of very high aspect ratio CNWs of predefined length. TheCNWs thus fabricated display core–shell structures having agraphitic shell with a glassy carbon core. The electrical conductivityof these CNWs is increased by about 100% compared to glassy carbonas a result of enhanced graphitization. We suggest some tunable fabricationand pyrolysis parameters that may improve graphitization in the resultingCNWs, making them a good replacement for several carbon nanostructure-baseddevices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2012/aamick.2012.4.issue-1/am2014376/production/images/medium/am-2011-014376_0002.gif'></P>
Infrared controlled waxes for liquid handling and storage on a CD-microfluidic platform
Abi-Samra, Kameel,Hanson, Ryan,Madou, Marc,Gorkin III, Robert A. Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.4
<P>A novel active valving technique, whereby paraffin wax plugs in microchannels on a centrifugal microfluidic platform are actuated using focused infrared (IR) radiation is demonstrated in this report. Microchannels were simultaneously or sequentially opened using a stationary IR source by forming wax plugs with similar or differing melting points. The presented wax plugs offer key advantages over current active valving techniques, including a less involved fabrication procedure, a simpler actuation process, and the ability to multiplex experiment with active valves. In addition, a new technique for automated liquid reagent storage and release on the microfluidic disc platform, based on the formation and removal of a wax layer, is demonstrated. Overall, the techniques presented in this report offer novel methods for liquid handling, separation, and storage on the centrifugal microfluidic disc platform.</P> <P>Graphic Abstract</P><P>Novel fluid handling and storage techniques for the centrifugal microfluidic disc platform based on non-contact actuation of paraffin wax plugs <I>via</I> infrared radiation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0lc00160k'> </P>
Maitra, Tanmoy,Sharma, Swati,Srivastava, Alok,Cho, Yoon-Kyoung,Madou, Marc,Sharma, Ashutosh Elsevier 2012 Carbon Vol.50 No.5
<P><B>Abstract</B></P><P>Single suspended carbon nanofibers on carbon micro-structures were fabricated by directed electrospinning and subsequent pyrolysis at 900°C of carbon nanotube/polyacrylonitrile (CNT/PAN) composite material. The electrical conductivity of the nanofibers was measured at different weight fractions of CNTs. It was found that the conductivity increased almost two orders of magnitude upon adding 0.5wt.% CNTs. The correlation between the extent of graphitization and electrical properties of the composite nanofiber was examined by various structural characterization techniques, and the presence of graphitic regions in pyrolyzed CNT/PAN nanofibers was observed that were not present in pure PAN-derived carbon. The influence of fabrication technique on the ordering of carbon sheets in electrospun nanofibers was examined and a templating effect by CNTs that leads to enhanced graphitization is suggested.</P>
Cito, Salvatore,Ahn, Yeh-Chan,Pallares, Jordi,Duarte, Rodrigo Martinez,Chen, Zhongping,Madou, Marc,Katakis, Ioanis Springer-Verlag 2012 Microfluidics and Nanofluidics Vol.13 No.2
<P>Capillary-driven flow (CD-flow) in microchannels plays an important role in many microfluidic devices. These devices, the most popular being those based in lateral flow, are becoming increasingly used in health care and diagnostic applications. CD-flow can passively pump biological fluids as blood, serum or plasma, in microchannels and it can enhance the wall mass transfer by exploiting the convective effects of the flow behind the meniscus. The flow behind the meniscus has not been experimentally identified up to now because of the lack of high-resolution, non-invasive, cross-sectional imaging means. In this study, spectral-domain Doppler optical coherence tomography is used to visualize and measure the flow behind the meniscus in CD-flows of water and blood. Microchannels of polydimethylsiloxane and glass with different cross-sections are considered. The predictions of the flow behind the meniscus of numerical simulations using the power-law model for non-Newtonian fluids are in reasonable agreement with the measurements using blood as working fluid. The extension of the Lucas-Washburn equation to non-Newtonian power-law fluids predicts well the velocity of the meniscus of the experiments using blood.</P>
Centrifugal microfluidics for biomedical applications
Gorkin, Robert,Park, Jiwoon,Siegrist, Jonathan,Amasia, Mary,Lee, Beom Seok,Park, Jong-Myeon,Kim, Jintae,Kim, Hanshin,Madou, Marc,Cho, Yoon-Kyoung Royal Society of Chemistry 2010 Lab on a chip Vol.10 No.14
<P>The centrifugal microfluidic platform has been a focus of academic and industrial research efforts for almost 40 years. Primarily targeting biomedical applications, a range of assays have been adapted on the system; however, the platform has found limited commercial success as a research or clinical tool. Nonetheless, new developments in centrifugal microfluidic technologies have the potential to establish wide-spread utilization of the platform. This paper presents an in-depth review of the centrifugal microfluidic platform, while highlighting recent progress in the field and outlining the potential for future applications. An overview of centrifugal microfluidic technologies is presented, including descriptions of advantages of the platform as a microfluidic handling system and the principles behind centrifugal fluidic manipulation. The paper also discusses a history of significant centrifugal microfluidic platform developments with an explanation of the evolution of the platform as it pertains to academia and industry. Lastly, we review the few centrifugal microfluidic-based sample-to-answer analysis systems shown to date and examine the challenges to be tackled before the centrifugal platform can be more broadly accepted as a new diagnostic platform. In particular, fully integrated, easy to operate, inexpensive and accurate microfluidic tools in the area of <I>in vitro</I> nucleic acid diagnostics are discussed.</P> <P>Graphic Abstract</P><P>This paper presents an in-depth review of the centrifugal microfluidic platform for biomedical applications, while highlighting recent progress in the field and outlining the potential for future applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b924109d'> </P>