Cluster formation of nanoparticles in an optical trap studied by fluorescence correlation spectroscopy Export

@article{citeulike:1886286, abstract = {We report in situ observation of cluster growth of nanoparticles confined in an optical trapping potential by means of fluorescence correlation spectroscopy. When an optical trapping force caused by a highly focused laser beam acts on nanoparticle suspensions, the number of nanoparticles increases and an assembly can be formed at the focal spot. The decay times of fluorescence autocorrelation curves were investigated as a function of the irradiation time of the laser beam and the laser power. In the initial stage of the optical assembling, the decay time increases with the irradiation time of the laser beam. On the other hand, in the later stage, a decrease of the decay time was observed. This behavior is explained successfully by using two models of Brownian motion under weak and strong optical trapping. It was revealed that trapping and clustering of nanoparticles proceed simultaneously and clusters confined in the focal spot make larger aggregates spontaneously. {\copyright} 2005 The American Physical Society. Art. No.: 021408}, address = {Department of Applied Physics, Handai Frontier Research Center, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan}, author = {Hosokawa, C. and Yoshikawa, H. and Masuhara, H.}, citeulike-article-id = {1886286}, citeulike-linkout-0 = {http://dx.doi.org/10.1103/PhysRevE.72.021408}, citeulike-linkout-1 = {http://www.scopus.com/record/display.url?view=extended&origin=resultslist&eid=2-s2.0-27244437243}, doi = {10.1103/PhysRevE.72.021408}, journal = {Phys. Rev. E Stat. Nonlinear Soft Matter Phys.}, keywords = {clusters, correlation, fcs, fluorescence, nanoparticles, optical, spectroscopy, trap, tweezers}, number = {2}, pages = {1--7}, posted-at = {2007-11-08 21:45:49}, priority = {2}, title = {Cluster formation of nanoparticles in an optical trap studied by fluorescence correlation spectroscopy}, url = {http://dx.doi.org/10.1103/PhysRevE.72.021408}, volume = {72}, year = {2005} }

TY - JOUR ID - citeulike:1886286 L3 - citeulike-article-id:1886286 N2 - We report in situ observation of cluster growth of nanoparticles confined in an optical trapping potential by means of fluorescence correlation spectroscopy. When an optical trapping force caused by a highly focused laser beam acts on nanoparticle suspensions, the number of nanoparticles increases and an assembly can be formed at the focal spot. The decay times of fluorescence autocorrelation curves were investigated as a function of the irradiation time of the laser beam and the laser power. In the initial stage of the optical assembling, the decay time increases with the irradiation time of the laser beam. On the other hand, in the later stage, a decrease of the decay time was observed. This behavior is explained successfully by using two models of Brownian motion under weak and strong optical trapping. It was revealed that trapping and clustering of nanoparticles proceed simultaneously and clusters confined in the focal spot make larger aggregates spontaneously. © 2005 The American Physical Society. Art. No.: 021408 IS - 2 JF - Phys. Rev. E Stat. Nonlinear Soft Matter Phys. AD - Department of Applied Physics, Handai Frontier Research Center, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan EP - 7 TI - Cluster formation of nanoparticles in an optical trap studied by fluorescence correlation spectroscopy VL - 72 SP - 1 KW - clusters KW - correlation KW - fcs KW - fluorescence KW - nanoparticles KW - optical KW - spectroscopy KW - trap KW - tweezers AU - Hosokawa, C AU - Yoshikawa, H AU - Masuhara, H PY - 2005/// UR - http://dx.doi.org/10.1103/PhysRevE.72.021408 ER -