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27 Oct 2008

Volume 93, Issue 17, Articles (17xxxx)

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Appl. Phys. Lett. 93, 172501 (2008); http://dx.doi.org/10.1063/1.3005561 (3 pages)

Yan Wang, X. F. Han, and X.-G. Zhang
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Micromechanical observation of the kinetics of biomolecular interactions

Taeyun Kwon, Kilho Eom, Jinsung Park, Dae Sung Yoon, Hong Lim Lee, and Tae Song Kim

Appl. Phys. Lett. 93, 173901 (2008); http://dx.doi.org/10.1063/1.3006329 (3 pages) | Cited 14 times

Online Publication Date: 31 October 2008

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Resonant microcantilevers have recently enabled the label-free detection of biomolecules. Here, we observed the kinetics of biomolecular interactions such as antigen-antibody interactions and/or DNA hybridization based on a resonant frequency shift, obeying Langmuir kinetics, measured in a buffer solution. It is shown that the kinetics of DNA adsorptions on the surface is governed by intermolecular interactions between adsorbed DNA molecules. It is also shown that the kinetics of DNA hybridization is determined by the intermolecular interaction. It is implied that resonant microcantilever in buffer solution may allow for gaining insights into the kinetics of various molecular interactions.
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87.80.Ek Mechanical and micromechanical techniques
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
87.14.gk DNA
87.14.E- Proteins
87.15.R- Reactions and kinetics
87.15.K- Molecular interactions; membrane-protein interactions

Biocompatible poly(vinylidene fluoride)/cyanoacrylate composite coatings with tunable hydrophobicity and bonding strength

I. S. Bayer, M. K. Tiwari, and C. M. Megaridis

Appl. Phys. Lett. 93, 173902 (2008); http://dx.doi.org/10.1063/1.3009292 (3 pages) | Cited 13 times

Online Publication Date: 31 October 2008

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Biocompatible composite coatings are produced from solution processable poly(vinylidene fluoride)/cyanoacrylate blends prepared in the presence of rosin and ZnO particle fillers, the latter for control of coating surface microstructure. Dispersions are spray coated and cured at 100 °C onto aluminum foils and fiberglass cloths suitable for tissue engineering applications. The elastic modulus of the composite films matches or exceeds that of polyethylene-based orthopedic implant materials. Contact angle measurements on coated fiberglass cloths reveal that wettability of hydrophobic coatings is maintained under strain for applied mechanical stress levels up to ∼ 15 kN/m2, whereas ultrahydrophobic coatings fail at ∼ 5 kN/m2.
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81.05.Qk Reinforced polymers and polymer-based composites
81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)
81.15.Rs Spray coating techniques
68.55.at Other materials
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.de Elastic moduli
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