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17 Sep 2007

Volume 91, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 91, 123101 (2007); http://dx.doi.org/10.1063/1.2784389 (3 pages)

Thierry Laroche, Alexandre Vial, and Matthieu Roussey
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Electromagnetic actuation and microchannel engineering of a polymer micropen array integrated with microchannels and sample reservoirs for biological assay patterning

Maesoon Im, Il-Joo Cho, Kwang-Seok Yun, and Euisik Yoon

Appl. Phys. Lett. 91, 124101 (2007); http://dx.doi.org/10.1063/1.2787971 (3 pages) | Cited 1 time

Online Publication Date: 20 September 2007

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A polymer (SU-8) micropen array was fabricated for application to biological assay patterning. The micropen, which is integrated with a microchannel and a sample reservoir, can be actuated by Lorentz force induced on an integrated metal actuator. Current to a metal line deflects the micropen up to 1.8 μm by electromagnetic force induced from external permanent magnets. Red ink is loaded in the reservoir and is automatically drawn to the end point of the microchannel by capillary force. A red-ink dot with a diameter of 11 μm was successfully placed onto paper by the fabricated micropen.
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87.80.-y Biophysical techniques (research methods)

Marangoni flow in an evaporating water droplet

Xuefeng Xu and Jianbin Luo

Appl. Phys. Lett. 91, 124102 (2007); http://dx.doi.org/10.1063/1.2789402 (3 pages) | Cited 28 times

Online Publication Date: 20 September 2007

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Marangoni effect has been observed in many liquids, but its existence in pure water is still a debated problem. In the present work, the Marangoni flow in evaporating water droplets has been observed by using fluorescent nanoparticles. Flow patterns indicate that a stagnation point where the surface flow, the surface tension gradient, and the surface temperature gradient change their directions exists at the droplet surface. The deduced nonmonotonic variation of the droplet surface temperature, which is different from that in some previous works, is explained by a heat transfer model considering the adsorbed thin film of the evaporating liquid droplet.
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47.55.Ca Gas/liquid flows
47.55.pf Marangoni convection
68.03.Cd Surface tension and related phenomena
68.03.Fg Evaporation and condensation of liquids
68.15.+e Liquid thin films
68.43.-h Chemisorption/physisorption: adsorbates on surfaces

Micronanofabrication of assembled three-dimensional microstructures by designable multiple beams multiphoton processing

Xian-Zi Dong, Zhen-Sheng Zhao, and Xuan-Ming Duan

Appl. Phys. Lett. 91, 124103 (2007); http://dx.doi.org/10.1063/1.2789661 (3 pages) | Cited 14 times

Online Publication Date: 20 September 2007

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The authors proposed a customizable multiple beam multiphoton polymerization micronanofabrication method for parallel processing of assembled structures. The configuration and geometry of multiple beams were designed by changing the parameters of lenses set as well as aperture masks. Various assembled two-dimensional and three-dimensional microstructures including microgears and photonic crystals were demonstrated under nanometer scale resolution and high fabrication efficiency. The proposed micronanofabrication method could be expected to play an important role in the fabrication of micromachines and microdevices.
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85.35.-p Nanoelectronic devices
81.16.Nd Micro- and nanolithography
07.10.Cm Micromechanical devices and systems

Dissolution and diffusion behavior of Al2O3 in a CaO–Al2O3–SiO2 liquid: An experimental-numerical approach

F. Verhaeghe, J. Liu, M. Guo, S. Arnout, B. Blanpain, and P. Wollants

Appl. Phys. Lett. 91, 124104 (2007); http://dx.doi.org/10.1063/1.2786854 (3 pages) | Cited 3 times

Online Publication Date: 21 September 2007

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A technique to study the dissolution and diffusion behavior of Al2O3 in CaO–Al2O3–SiO2 liquids is presented. The dissolution of spherical Al2O3 particles at elevated temperatures is observed using confocal scanning laser microscopy and interpreted by means of numerical simulations with a lattice Boltzmann dissolution model. The dissolution mechanism is identified as diffusion-controlled and an estimate of the effective binary diffusion coefficient and its activation energy is obtained. The technique is readily applicable to other systems.
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64.75.-g Phase equilibria
66.10.C- Diffusion and thermal diffusion
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