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Department: search.filters.department.Department of PhysicsSubject: search.filters.subject.Molecular dynamics

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    Phase behaviour and dynamics of three-dimensional active dumbbell systems
    (Royal Society of Chemistry, 2024) Caporusso, C.B.; Negro, G.; Suma, A.; Digregorio, P.; Gonnella G; Cugliandolo, L.F.; Department of Physics; Carenza, Livio Nicola; Department of Physics; College of Sciences
    We present a comprehensive numerical study of the phase behavior and dynamics of a three-dimensional active dumbbell system with attractive interactions. We demonstrate that attraction is essential for the system to exhibit nontrivial phases. We construct a detailed phase diagram by exploring the effects of the system's activity, density, and attraction strength. We identify several distinct phases, including a disordered, a gel, and a completely phase-separated phase. Additionally, we discover a novel dynamical phase, that we name percolating network, which is characterized by the presence of a spanning network of connected dumbbells. In the phase-separated phase we characterize numerically and describe analytically the helical motion of the dense cluster.
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    Single-molecule fluorescence of terrylene embedded in anthracene matrix: a room temperature study
    (Elsevier Science Bv, 2012) N/A; Department of Physics; Yüce, Mehdi Yavuz; Kiraz, Alper; PhD Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; College of Sciences; N/A; 22542
    We characterized room-temperature fluorescence properties of single terrylene molecules embedded in anthracene thin films that were prepared by spin-coating on glass substrates. Our results show that terrylene molecules embedded in anthracene matrix are oriented nearly parallel to the substrate. Typical measured fluorescence lifetime of terrylene was 3.6 ns and photon count rate at saturation was 750 kHz. Our analyses of 104 molecules indicate that we can detect on average 1.6 x 10(6) photons from a single terrylene molecule before it photobleaches. These results make terrylene-anthracene a promising guest-host system for room temperature single molecule experiments.