Combinatorial selective synthesis and excitation experiments for quantitative analysis of effects of Au on a semiconductor photocatalyst

Ahn, Yongdeok; Park, Jiseong; Park, Minsoo; Jin, Siwoo; Jo, Woohyun; Kim, Jeongho; Cho, Seung Hwan; Seo, Daeha

doi:10.1016/j.chempr.2022.06.004

Cited by 4 publications

(5 citation statements)

References 45 publications

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“…Through the mean-squared displacement analysis, the endosomal trajectory can be classified into two states based on the instantaneous diffusion coefficient D (two distinct distributions, D < 10 −2.3 μm 2 s −1 and D > 10 −2.3 μm 2 s −1 ) (Figure 2a-c). Considering the anomalous exponent at each state (𝛼, 𝛼 = 1: normal diffusion; 𝛼 > 1: super-diffusion; 𝛼 < 1: confined diffusion), [34,35] the calculated 𝛼 (𝛼 = 0.57 ± 0.19 or 𝛼 = 1.33 ± 0.25) (Figure S8, Supporting Information) suggests that endosomal movements can be classified as either "pause" or "run" states. Moving for-ward, subscripts will be employed to represent each state, such as D pause , 𝛼 run , and Δ𝜑 run .…”

Section: Lateral and Rotational Motion Of A Single Endosome In A Livi...mentioning

confidence: 99%

Temporal Patterns of Angular Displacement of Endosomes: Insights into Motor Protein Exchange Dynamics

Jin,

Ahn,

Park

et al. 2024

Advanced Science

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The material transport system, facilitated by motor proteins, plays a vital role in maintaining a non‐equilibrium cellular state. However, understanding the temporal coordination of motor protein activity requires an advanced imaging technique capable of measuring 3D angular displacement in real‐time. In this study, a Fourier transform‐based plasmonic dark‐field microscope has been developed using anisotropic nanoparticles, enabling the prolonged and simultaneous observation of endosomal lateral and rotational motion. A sequence of discontinuous 3D angular displacements has been observed during the pause and run phases of transport. Notably, a serially correlated temporal pattern in the intermittent rotational events has been demonstrated during the tug‐of‐war mechanism, indicating Markovian switching between the exploitational and explorational modes of motor protein exchange prior to resuming movement. Alterations in transition frequency and the exploitation‐to‐exploration ratio upon dynein inhibitor treatment highlight the relationship between disrupted motor coordination and reduced endosomal transport efficiency. Collectively, these results suggest the importance of orchestrated temporal motor protein patterns for efficient cellular transport.

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Section: Lateral and Rotational Motion Of A Single Endosome In A Livi...mentioning

confidence: 99%

Temporal Patterns of Angular Displacement of Endosomes: Insights into Motor Protein Exchange Dynamics

Jin,

Ahn,

Park

et al. 2024

Advanced Science

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Section: Total Internal Reflection Fluorescence Microscopymentioning

confidence: 99%

“…Seo et al used TIRF microscopy to analyze the photocatalytic reaction as a function of excitation pathways and quantify the influence of Au on semiconductor photocatalysts (Figure 3d). 45 Despite possessing a significant absorption cross‐section in the visible region, plasmonic metals exhibit exceptional stability against visible light 46 . Additionally, Au improves the catalytic performance of adjacent semiconductors; however, the precise electron or energy transfer pathways are yet to be understood 47–51 .…”

Section: Total Internal Reflection Fluorescence Microscopymentioning

confidence: 99%

“…Seo et al employed N‐isopropylacrylamine (PNIPAm), a thermo‐sensitive polymer, to demonstrate the negligible photothermal effect of the gold domain in the photocatalyst (Figure 4b). 45 They deposited a hybridized nanostructure on PNIPAm, which undergoes a reversible phase transition at a lower critical solution temperature (LCST, 32°C), and measured the scattering spectrum of a single particle. When the temperature of the solvent was increased by heating above the LCST, the LSPR λ max shifted from 635 to 650 nm; however, no shift was observed upon irradiating the catalyst.…”

Section: Total Internal Reflection Fluorescence Microscopymentioning

confidence: 99%

Section: Total Internal Reflection Fluorescence Microscopymentioning

confidence: 99%

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Observation of reactions in single molecules/nanoparticles using light microscopy

Ahn

Park

Seo

2022

Bulletin Korean Chem Soc

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Recent techniques for direct observation of single molecules or nanoparticles provide methodologies for imaging the activation sites of heterogeneous catalysts (spatially resolved) and observing intermediates that are not visible in the ensemble average (temporally resolved). Accordingly, the primary challenge for related experiments is obtaining sufficient spatial and temporal resolutions for microscopic observation of the chemical reaction of interest. This review discusses recent advances in fluorescence—for example, total internal reflection fluorescence (TIRF)—and dark‐field microscopy—for example, imaging plasmonic probes—used for observing organic, inorganic, and biological reactions. The following key factors for microscopic observation of chemical reactions are discussed: (1) design of the chemical reaction and probe, (2) selection of microscope based on reaction's temporal information, and (3) use of machine learning algorithms to analyze the sequence imaging data. This review summarizes experimental techniques and detailed examples of reactions at the single molecule and nanoparticle level. Furthermore, it discusses avenues of development. These observations can guide the development of new and systematic methodological approaches for investigating important unsolved problems in chemistry.

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Topotactic cation exchange induced non-epitaxial atomic-organized interface in plasmonic metal-semiconductor hetero-films for efficient photoelectrochemical hydrogen evolution

Chen,

Li,

et al. 2024

Applied Catalysis B: Environment and Energy

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Combinatorial selective synthesis and excitation experiments for quantitative analysis of effects of Au on a semiconductor photocatalyst

Cited by 4 publications

References 45 publications

Temporal Patterns of Angular Displacement of Endosomes: Insights into Motor Protein Exchange Dynamics

Temporal Patterns of Angular Displacement of Endosomes: Insights into Motor Protein Exchange Dynamics

Observation of reactions in single molecules/nanoparticles using light microscopy

Topotactic cation exchange induced non-epitaxial atomic-organized interface in plasmonic metal-semiconductor hetero-films for efficient photoelectrochemical hydrogen evolution

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