Real-space imaging of nanoparticle transport and interaction dynamics by graphene liquid cell TEM
- 주제(기타) Multidisciplinary Sciences
- 설명문(일반) [Kang, Sungsu; Lee, Minyoung; Yu, Ji Woong; Kim, Joodeok; Kang, Dohun; Baek, Hayeon; Bae, Yuna; Lee, Won Bo; Hyeon, Taeghwan; Park, Jungwon] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 08826, South Korea; [Kang, Sungsu; Lee, Minyoung; Yu, Ji Woong; Kim, Joodeok; Kang, Dohun; Baek, Hayeon; Bae, Yuna; Lee, Won Bo; Hyeon, Taeghwan; Park, Jungwon] Seoul Natl Univ, Inst Chem Proc, Seoul 08826, South Korea; [Kang, Sungsu; Hyeon, Taeghwan; Park, Jungwon] Inst Basic Sci IBS, Ctr Nanoparticle Res, Seoul 08826, South Korea; [Kim, Ji-Hyun; Sung, Jaeyoung] Chung Ang Univ, Dept Chem, Seoul 06974, South Korea; [Kim, Ji-Hyun; Sung, Jaeyoung] Chung Ang Univ, Ctr Chem Dynam Living Cells, Seoul 06974, South Korea; [Kim, Byung Hyo] Soongsil Univ, Dept Organ Mat & Fiber Engn, Seoul 06978, South Korea; [Kang, Seulki; Park, So-Jung] Ewha Womans Univ, Dept Chem & Nanosci, Seoul 03760, South Korea; [Shim, Sangdeok] Sunchon Natl Univ, Dept Chem, Sunchon 57922, South Korea; [Park, Jungwon] Seoul Natl Univ, Inst Engn Res, Seoul 08826, South Korea
- 등재 SCIE, SCOPUS
- OA유형 Green Published
- 발행기관 AMER ASSOC ADVANCEMENT SCIENCE
- 발행년도 2021
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000191132
- 본문언어 영어
- Published As https://doi.org/10.1126/sciadv.abi5419
- PubMed https://pubmed.ncbi.nlm.nih.gov/34860549
초록/요약
Thermal motion of colloidal nanoparticles and their cohesive interactions are of fundamental importance in nanoscience but are difficult to access quantitatively, primarily due to the lack of the appropriate analytical tools to investigate the dynamics of individual particles at nanoscales. Here, we directly monitor the stochastic thermal motion and coalescence dynamics of gold nanoparticles smaller than 5 nm, using graphene liquid cell (GLC) transmission electron microscopy (TEM). We also present a novel model of nanoparticle dynamics, providing a unified, quantitative explanation of our experimental observations. The nanoparticles in a GLC exhibit non-Gaussian, diffusive motion, signifying dynamic fluctuation of the diffusion coefficient due to the dynamically heterogeneous environment surrounding nanoparticles, including organic ligands on the nanoparticle surface. Our study shows that the dynamics of nanoparticle coalescence is controlled by two elementary processes: diffusion-limited encounter complex formation and the subsequent coalescence of the encounter complex through rotational motion, where surface-passivating ligands play a critical role.
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