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354 results on '"Li, Wangchang"'

36. Scalable and Flexible Multi‐Layer Prismatic Photonic Metamaterial Film for Efficient Daytime Radiative Cooling.

Author

Li, Wangchang, Zhan, Huanchen, Huang, Nengyan, Ying, Yao, Yu, Jing, Zheng, Jingwu, Qiao, Liang, Li, Juan, and Che, Shenglei

Subjects
*METAMATERIALS, *COOLING, *CLIMATE change, *AIR conditioning, *ELECTRICAL energy
Abstract

To maintain a comfortable indoor living environment in low latitude or tropical regions, humans consume significant amounts of electrical energy in air conditioning, leading to substantial CO2 emissions. Passive daytime radiative cooling (PDRC) allows objects to cool down during the daytime without any energy consumption by dissipating heat through the atmospheric transparency window (8−13 µm) to outer space, which has garnered significant attention. However, the practical applications of common PDRC materials are hindered by their poor optical selectivity and high‐reflective silver backing. Additionally, the availability of artificial photon emitters with complex structures and excellent performance is also limited by their high cost. Herein, a novel multilayer prismatic photonic metamaterial film without any silver reflector, easily scalable and produced by a roll‐to‐roll method is demonstrated, which exhibits ≈96.4% sunlight reflectance (0.3−2.5 µm) and ≈97.2% emissivity in mid‐infrared (IR) (8−13 µm). At an average solar intensity of ≈920 W m−2, it is on average 6.8 °C below ambient temperature during the day and theoretically yields a radiative cooling power of 88.9 W m−2. Furthermore, the film exhibits excellent hydrophobicity, superior flexibility, and robust mechanical strength, providing an attractive and viable pathway for practical applications addressing the pressing challenges of climate and energy issues. [ABSTRACT FROM AUTHOR]

Published
2024
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37. The thermal debinding of soluble binders in injection molded zirconia ceramic from room temperature to 250°C.

Author

Zhu, Jiacheng, Qiao, Liang, Zheng, Jingwu, Ying, Yao, Cai, Wei, Li, Juan, Yu, Jing, Li, Wangchang, and Che, Shenglei

Subjects
INJECTION molding of ceramics, SURFACE cracks, ZIRCONIUM oxide, POLLUTION
Abstract

In ceramic injection molding, the conventional solvent‐debinding process encounters limitations such as solvent cost and environmental pollution. In this paper, a suitable thermal‐debinding process from room temperature to 250°C using carbon/alumina embedding powders with nano and submicron size was developed to remove the soluble binders replacing the conventional solvent debinding of injection molding ZrO2 ceramic. The effects of the embedding powders on microstructure and debinding ratio were studied in detail. The results showed that the main factor influencing debinding ratio was associated with the sufficient dispersing of mixed particles, which was characterized by the relative change ratio of tap volume. A debinding mechanism was proposed to explain the effects of carbon/alumina mixed powders on the debinding ratio and surface cracks. Based on the influencing mechanism, the debinded green part with the elimination of soluble binders and optimal surface was achieved using the mixed powders with C/A = 8/2 on the top and C/A = 4/6 on the bottom. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Acidity-Responsive Fe-PDA@CaCO3Nanoparticles for Photothermal-Enhanced Calcium-Overload- and Reactive-Oxygen-Species-Mediated Tumor Therapy

Author

Zhao, Fan, Wang, Chen, Wang, Heng, Ying, Yao, Li, Wangchang, Li, Juan, Zheng, Jingwu, Qiao, Liang, Che, Shenglei, and Yu, Jing

Abstract

Calcium-overload-mediated tumor therapy has received considerable interest in oncology. However, its efficacy has been proven to be inadequate due to insufficient calcium ion concentration at the tumor site coupled with challenges in facilitating efficient calcium uptake by tumors, leading to unsatisfactory therapeutic outcomes. In the present study, calcium carbonate nanoshell mineralized ferric polydopamine nanoparticles (Fe-PDA@CaCO3NPs) were prepared for achieving Ca2+-overload-mediated tumor therapy. Upon entering the tumor site, the pH-responsive CaCO3layer, acting as a “Ca2+storage pool”, rapidly degraded and released high quantities of free Ca2+within the weakly acidic environment. The Fe-PDA core, with its excellent photothermal conversion properties, could significantly increase the temperature upon exposure to near-infrared (NIR) light irradiation, thereby activating the TRPV1 channel and leading to a large influx of released Ca2+into the cytoplasm. Furthermore, the exposed Fe-PDA core could react with the tumor-overexpressed hydrogen peroxide (H2O2) to efficiently produce hydroxyl radicals (•OH), significantly increasing intracellular reactive oxygen species (ROS) levels and thus inhibiting the activity of the Ca2+efflux pump, resulting in a high intracellular Ca2+concentration. Ultimately, the increase in calcium/ROS levels could disrupt mitochondrial homeostasis and activate the apoptosis pathway. The current work presents a promising approach for tumor therapy using photothermal-enhanced calcium-overload-mediated ion interference therapy and chemodynamic therapy.

Published
2024
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