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• W2327884083 startingPage "9363" @default.
• W2327884083 abstract "Due to its high specific surface area and chemical stability, porous silica is used as a support structure in numerous applications, including heterogeneous catalysis, biomolecule immobilization, sensors, and liquid chromatography. Reversed-phase liquid chromatography (RPLC), which uses porous silica support particles, has become an indispensable separations tool in quality control, pharmaceutics, and environmental analysis requiring identification of compounds in mixtures. For complex samples, the need for higher resolution separations requires an understanding of the time scale of processes responsible for analyte retention in the stationary phase. In the present work, single-molecule fluorescence imaging is used to observe transport of individual molecules within RPLC porous silica particles. This technique allows direct measurement of intraparticle molecular residence times, intraparticle diffusion rates, and the spatial distribution of molecules within the particle. On the basis of the localization uncertainty and characteristic measured diffusion rates, statistical criteria were developed to resolve the frame-to-frame behavior of molecules into moving and stuck events. The measured diffusion coefficient of moving molecules was used in a Monte Carlo simulation of a random-walk model within the cylindrical geometry of the particle diameter and microscope depth-of-field. The simulated molecular transport is in good agreement with the experimental data, indicating transport of moving molecules in the porous particle is described by a random-walk. Histograms of stuck-molecule event times, locations, and their contributions to intraparticle residence times were also characterized." @default.
• W2327884083 created "2016-06-24" @default.
• W2327884083 creator A5059326347 @default.
• W2327884083 creator A5078927573 @default.
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• W2327884083 date "2013-09-18" @default.
• W2327884083 modified "2023-10-02" @default.
• W2327884083 title "Fluorescence Imaging of Single-Molecule Retention Trajectories in Reversed-Phase Chromatographic Particles" @default.
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• W2327884083 doi "https://doi.org/10.1021/ac402251r" @default.
• W2327884083 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23998479" @default.
• W2327884083 hasPublicationYear "2013" @default.
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