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Start Over Author "Yang Hongjun" Journal acs applied materials & interfaces
14 results on '"Yang Hongjun"'

3. Few-Layer Clayenes for Material and Environmental Applications

Author

Bibiao Jiang, Dongjiang Yang, Sridhar Komarneni, Young Dong Noh, Jianfeng Ma, April Doroski, Yan Dong, Christopher A. Gorski, Aron M. Griffin, Xiaoqiang Xue, Wenyan Huang, and Yang Hongjun

Subjects
Materials science, Scanning electron microscope, Analytical chemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Crystal, X-ray photoelectron spectroscopy, Transmission electron microscopy, Mössbauer spectroscopy, General Materials Science, Mica, 0210 nano-technology, High-resolution transmission electron microscopy, Spectroscopy
Abstract

Here, we coined the term "clayene" for a single layer of clay and "few-layer clayene" for clays with 2-10 layers. Few-layer clayenes, which are Fe2+-rich and mica-type, were prepared hydrothermally at 200 °C and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM)/high-resolution transmission electron microscopy (HRTEM) to determine the crystalline phases and morphology, respectively. Chemical composition by energy-dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy confirmed the iron-rich mica composition, and the latter also revealed the presence of both Fe2+ and Fe3+. Mossbauer spectroscopy further confirmed the presence of Fe2+ and Fe3+ and their proportions in the mica-type few-layer clayenes. All of the synthesized mica-type few-layer clayenes except one exhibited high specific surface areas (SSAs) ranging from 94 to 149 m2/g as determined by N2 adsorption-desorption isotherms and the Brunauer-Emmett-Teller (BET) equation. The high surface areas are in conformity with the crystal sizes calculated from XRD peaks and also as revealed by HRTEM. Taking advantage of the interfacial reactions of the high surface area of few-layer clayenes, two potential applications of clayenes were demonstrated in materials and environmental fields.

Published
2020

9. Few-Layer Clayenes for Material and Environmental Applications

Author

Huang, Wenyan, primary, Komarneni, Sridhar, additional, Gorski, Christopher, additional, Noh, Young Dong, additional, Doroski, April, additional, Dong, Yan, additional, Ma, Jianfeng, additional, Griffin, Aron M., additional, Yang, Dongjiang, additional, Xue, Xiaoqiang, additional, Yang, Hongjun, additional, and Jiang, Bibiao, additional

Published
2020
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13. Highly Branched Copolymers with Degradable Bridges for Antifouling Coatings

Author

Yang, Hongjun, Chang, He, Zhang, Qian, Song, Yiye, Jiang, Li, Jiang, Qimin, Xue, Xiaoqiang, Huang, Wenyan, Ma, Chunfeng, and Jiang, Bibiao

Abstract

The antifouling properties of traditional self-polishing marine antifouling coatings are mainly achieved based on their hydrolysis-sensitive side groups or the degradable polymer main chains. Here, we prepared a highly branched copolymer for self-polishing antifouling coatings, in which the primary polymer chains are bridged by degradable fragments (poly-ε-caprolactone, PCL). Owing to the partial or complete degradation of PCL fragments, the remaining coating on the surface can be broken down and eroded by seawater. Finally, the polymeric surface is self-polished and self-renewed. The designed highly branched copolymers were successfully prepared by reversible complexation mediated polymerization (RCMP), and their primary main chains had an Mnof approximately 3410 g·mol–1. The hydrolytic degradation results showed that the degradation of the copolymer was controlled, and the degradation rate increased with increasing contents of degradable fragments. The algae settlement assay tests indicated that the copolymer itself has some antibiofouling ability. Moreover, the copolymer can serve as a controlled release matrix for antifoulant 4,5-dichloro-2-octylisothiazolone (DCOIT), and the release rate increases with the contents of degradable fragments. The marine field tests confirmed that these copolymer-based coatings exhibited excellent antibiofouling ability for more than 3 months. The current copolymer is derived from commonly used monomers and an easily conducted polymerization method. Hence, we believe this method may offer innovative insights into marine antifouling applications.

Published
2024
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14. High Infrared Blocking Cellulose Film Based on Amorphous to Anatase Transition of TiO2via Atomic Layer Deposition

Author

Li, Wenbin, Li, Linfeng, Wu, Xi, Li, Junyu, Jiang, Lang, Yang, Hongjun, Ke, Guizhen, Cao, Genyang, Deng, Bo, and Xu, Weilin

Abstract

A high IR-blocking cellulose film was designed based on an amorphous to anatase transition of TiO2using atomic layer deposition (ALD). This transition was realized at 250 °C, at which the cellulose is thermal stable. Optimized ALD condition of 250 °C and 1200 cycles give us an excellent heat insulator, which could significantly reduce the enclosed space temperature from 59.2 to 51.9 °C after exposure to IR lamp for 5 min.

Published
2018
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