PHYSICAL CHEMISTRY SEMINAR (Haw Yang, Princeton University)

May 04, 2017 - 01:00 PM - 02:00 PM

Lynch Lecture Hall Chemistry Complex

Attached Document: 


Real-Time 3D Single-Particle Tracking Spectroscopy and Its Applications

Real-time 3D single-particle tracking spectroscopy is an experimental technique that allows one to follow a nanoprobe as its moves in three-dimensional space, either by diffusion or by active locomotion [1]. The technique keeps the nanoprobe at the center of the focus at all times by moving the sample stage to counter any movements that the probe exhibits. Effectively, the apparatus transforms the experimental coordinate from lab-based from to probe-based frame [2-4]. This way, it would become possible to do time-dependent experiments on the probe or the molecule tethered to the probe as if the particle or molecules are immobilized. This presentation will discuss its principles [5-7], capabilities [8-10], and applications—including (1) single-particle temperature-jump experiment testing the hot Brownian motion theory [11], (2) 3D multi-resolution imaging of virus-like particle interacting with a live cell [12], and (3) steering of self-propelled micro-swimmers and its implications in bacterial locomotion [13].





[1]     H. Cang, C. M. Wong, C. S. Xu, A. H. Rizvi, and H. Yang, Appl. Phys. Lett. 88 (2006) 223901.

[2]     H. Cang, C. S. Xu, and H. Yang, Chem. Phys. Lett. 457 (2008) 285.

[3]     D. Montiel and H. Yang, Laser & Photonics Reviews 3 (2010) 374.

[4]     H. Yang, Curr. Opin. Chem. Biol. 14 (2010) 3.

[5]     H. Yang, J. Chem. Phys. 129 (2008) 074701.

[6]     D. Montiel, H. Cang, and H. Yang, J. Phys. Chem. B 110 (2006) 19763.

[7]     K. Welsher and H. Yang, Faraday Discuss. 184 (2015) 359.

[8]     H. Cang, C. S. Xu, D. Montiel, and H. Yang, Opt. Lett. 32 (2007) 2729.

[9]     H. Cang, D. Montiel, C. S. Xu, and H. Yang, J. Chem. Phys. 129 (2008) 044503.

[10]   C. S. Xu, H. Cang, D. Montiel, and H. Yang, J. Phys. Chem. C 111 (2007) 32.

[11]   L. F. Guerra and H. Yang, manuscript in preparation.

[12]   K. Welsher and H. Yang, Nat. Nanotechnol. 9 (2014) 198.

[13]   B. Qian, D. Montiel, A. Bregulla, F. Cichos, and H. Yang, Chem. Sci. 4 (2013) 1420.



Inquires please contact Rosa Vargas

Department of Chemistry

231 S. 34 Street, Philadelphia, PA 19104-6323

215.898.8317 voice | 215.573.2112 fax |