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Application of Dye-coated Ultrasmall Gadolinium Oxide Nanoparticles for Biomedical Dual Imaging
Xu Miao,Wenlong Xu,차현실,장용민,오인택,채권석,이강호 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.9
Nanoparticles are very important in biomedical imaging because their imaging properties are superior to those of small molecules. They can be further functionalized for multimodal imaging through surface modification. In this study, we synthesized dye-coated ultrasmall gadolinium oxide nanoparticles [dye = fluorescein and fluorescein isothiocyanate (FITC)] in one-pot and investigated their dual imaging properties. The dye-coated gadolinium oxide nanoparticles exhibited excellent relaxometric properties suitable for T1 magnetic resonance imaging (MRI): r1 = 9.8 s−1mM−1 (r2/r1 = 2.6) for fluorescein-coated nanoparticles (davg = 1.6 ± 0.1 nm) and r1 = 12.3 s−1mM−1 (r2/r1 = 2.3) for FITC-coated nanoparticles (davg = 1.4 ± 0.1 nm), and strong photoluminescence (PL) in the green region (around 514 nm) suitable for fluorescent imaging (FI). The dye-coated nanoparticles exhibited strong fluorescence in cellular confocal images and high contrast in T1 MR images in mice, suggesting that they are potential dual T1 MRI-FI agents.
Electrically actuated liquid iris.
Xu, Miao,Ren, Hongwen,Lin, Yi-Hsin Optical Society of America 2015 Optics letters Vol.40 No.5
<P>We report an adaptive iris using dielectric liquids and a radial-interdigitated electrode. A black liquid is confined by a circular gasket with a donut shape. The surrounding of the black liquid is filled with an immiscible liquid. In the relaxing state, the black liquid obtains the largest clear aperture. By applying a voltage, the surface of the black liquid is stretched by the generated dielectric force, resulting in a reduction of its aperture. For the demonstrated iris, the diameter of the aperture can be changed from 4.7??mm to 1.2??mm when the voltage is applied from 0 to 70??V(rms). The aperture ratio is 94%. Owing to the radial-interdigitated electrode, the aperture size of the iris can be effectively switched with a reasonably fast response time. The optical switch is polarization-insensitive. The potential applications of our iris are light shutters, optical attenuators, biomimicry, and wearable devices.</P>
Effect of Cu2O Content in Electrodeposited CuOx Film on Perovskite Solar Cells
Xu Miao,Shuo Wang,Wenhai Sun,Yu Zhu,Chen Du,Ruixin Ma,Chengyan Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.10
It is well known that the different proportions of CuO and Cu2O in CuOx hole transfer materials have a great influence on the hole transport property as well as the device performances of perovskite solar cells (PSCs). In this paper, we changed the content of Cu2O in the film by controlling the deposition voltage during electrodeposition, and the effects of different contents of Cu2O in the films on the device were investigated for the first time. It was found that the content of Cu2O in the film reached the highest point with the deposition voltage 0.5 V, such films have the highest transmittance and carrier mobility. After assembling the device, the power conversion efficiency (PCE) of the champion device reached 13.48% under a one-sun AM 1.5G (100 mW/cm2) illumination. Furthermore, the unpackaged device based on CuOx still retained over 75% PCE after being placed in the ambient condition (30–40% humidity, 20–30 ℃) for 500 h.
Mohammad Yaseen Ahmad,차현실,오인택,Tirusew Tegafaw,XUMIAO,Son Long Ho,Shanti Marasini,Adibehalsadat Ghazanfari,Huan Yue,채권석,장용민,이강호 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.4
We prepared gadolinium oxide (Gd2O3) nanoparticles (GNPs) coated with a trans‐activator of transcription (TAT) peptide with cell‐penetrating ability (i.e., TAT‐GNPs) through one‐pot process. We characterized the particle diameter, surface‐coating structure, water proton relaxivities, and in vitro cellular toxicities of the TAT‐GNPs. We measured in vivo T1 magnetic resonance images (MRI) in a model nude mouse with liver cancer prior and posterior to intravenous administration. The average particle diameter of the GNPs was 1.5 nm. The sample solution exhibited a longitudinal water proton relaxivity (r1) of 18.2/s/mM (r2/r1 = 1.6, r2 = transverse water proton relaxivity), which is four to five times higher than those of commercial Gd‐chelates. The in vivo T1 MRI exhibited positively (or T1) enhanced contrasts in the mouse liver cancer after intravenous administration, demonstrating that the TAT‐GNPs acted as an enhanced cancer‐imaging agent similar to the cancer‐targeting agent in T1 MRI.