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28 Feb 2011

Volume 98, Issue 9, Articles (09xxxx)

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Appl. Phys. Lett. 98, 093502 (2011); http://dx.doi.org/10.1063/1.3531756 (3 pages)

Marina S. Leite, Robyn L. Woo, William D. Hong, Daniel C. Law, and Harry A. Atwater
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Localized surface plasmon resonance of nanoporous gold

Xingyou Lang, Lihua Qian, Pengfei Guan, Jian Zi, and Mingwei Chen

Appl. Phys. Lett. 98, 093701 (2011); http://dx.doi.org/10.1063/1.3560482 (3 pages) | Cited 11 times

Online Publication Date: 28 February 2011

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We report the plasmonic properties of free-standing nanoporous gold (NPG) films with an intricate bicontinuous nanostructure. Two characteristic plasmon bands of NPG have been detected in absorption spectra. One at ∼ 490 nm, resulting from the resonant absorption of gold films, is independent of nanopore sizes and dielectric surroundings. The other at ∼ 550–650 nm, arising from the excitation of localized surface plasmon resonance, shows obvious band shift with the nanopore sizes and dielectric indices of surrounding media, suggesting that NPG is a promising candidate as plasmonic sensors for organic and biologic molecule detection. This study also shines light on the underlying mechanisms of surface enhanced spectroscopy of NPG.
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81.07.Bc Nanocrystalline materials
73.22.Lp Collective excitations
78.67.Rb Nanoporous materials
68.55.aj Insulators
78.30.Er Solid metals and alloys

Spatially optimized gene transfection by laser-induced breakdown of optically trapped nanoparticles

Yoshihiko Arita, Maria Leilani Torres-Mapa, Woei Ming Lee, Tomáš Čižmár, Paul Campbell, Frank J. Gunn-Moore, and Kishan Dholakia

Appl. Phys. Lett. 98, 093702 (2011); http://dx.doi.org/10.1063/1.3554415 (3 pages) | Cited 7 times

Online Publication Date: 2 March 2011

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We demonstrate laser-induced breakdown of an optically trapped nanoparticle with a nanosecond laser pulse. Controllable cavitation within a microscope sample was achieved, generating shear stress to monolayers of live cells. This efficiently permeabilize their plasma membranes. We show that this technique is an excellent tool for plasmid-DNA transfection of cells with both reduced energy requirements and reduced cell lysis compared to previously reported approaches. Simultaneous multisite targeted nanosurgery of cells is also demonstrated using a spatial light modulator for parallelizing the technique.
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87.16.dp Transport, including channels, pores, and lateral diffusion
87.85.Rs Nanotechnologies-applications
87.50.wp Therapeutic applications

Direct laser immobilization of photosynthetic material on screen printed electrodes for amperometric biosensor

Christos Boutopoulos, Eleftherios Touloupakis, Ittalo Pezzotti, Maria Teresa Giardi, and Ioanna Zergioti

Appl. Phys. Lett. 98, 093703 (2011); http://dx.doi.org/10.1063/1.3562297 (3 pages) | Cited 1 time

Online Publication Date: 2 March 2011

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This letter demonstrates the direct laser printing of photosynthetic material onto low cost nonfunctionalized screen printed electrodes for the fabrication of photosynthesis-based amperometric biosensors. The high kinetic energy of the transferred material induces direct immobilization of the thylakoids onto the electrodes without the use of linkers. This type of immobilization is able to establish efficient electrochemical contact between proteins and electrode, stabilizing the photosynthetic biomolecule and transporting electrons to the solid state device with high efficiency. The functionality of the laser printed biosensors was evaluated by the detection of a common herbicide such as Linuron.
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87.15.hg Dynamics of intermolecular interactions
82.50.-m Photochemistry
87.80.-y Biophysical techniques (research methods)
82.47.Rs Electrochemical sensors
87.85.-d Biomedical engineering
87.15.R- Reactions and kinetics

Mesoporous silica nanoparticles encapsulating Gd2O3 as a highly efficient magnetic resonance imaging contrast agent

Shuang Li, Huan liu, Li Li, Ning-Qi Luo, Ri-Hui Cao, Di-Hu Chen, and Yuan-Zhi Shao

Appl. Phys. Lett. 98, 093704 (2011); http://dx.doi.org/10.1063/1.3560451 (3 pages) | Cited 4 times

Online Publication Date: 2 March 2011

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The water-adsorptive capabilities of Gd2O3@MCM-41 as contrast agents with various gadolinium additions were evaluated by molecular dynamic simulation, which indicates that increasing gadolinum leads to the decrease in water molecules adsorbed on the surfaces of mesoporous silica and Gd2O3 nanocluster. Gd2O3@MCM-41 nanoparticles were synthesized by a one-step method. The measured microstructure and water-adsorptive capability of Gd2O3@MCM-41 consist with their simulated counterparts. The observation disclosed that the nanoparticles injected within mice were distributed in their liver and tumor. The enhancement of in vivo magnetic resonance imaging was detected in the tumor and inferior vena cava of the mice contrasted with Gd2O3@MCM-41.
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87.61.-c Magnetic resonance imaging
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
87.85.J- Biomaterials
81.16.-c Methods of micro- and nanofabrication and processing
87.85.Rs Nanotechnologies-applications
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