Mxene structure: A key parameter in corrosion barrier performance of organic coatings

Ziyang Zhou,Sepideh Pourhashem,Zhengquan Wang,Jiawen Sun,Xiaohong Ji,Xiaofan Zhai,Jizhou Duan,Baorong Hou 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-

In this research, the effects of fresh and oxidized MXene on the surface, adhesion, and corrosion-resistantproperties of waterborne epoxy coatings are considered. The oxidized MXene is prepared through storageof fresh MXene nanosheets in an open vial for 1 month. The results confirm that the waterborne epoxycoating loaded with silane functionalized fresh MXene nanosheets (epoxy/F-MXene) has significantlyhigher barrier performance and anti-corrosion behavior than the sample modified with silane functionalizedoxidized MXene nanosheets (epoxy/F-O-MXene). Indeed, the F-MXene nanosheets (with defectfreeand large two dimensional morphology) are able to effectively inhibit the path of corrosive mediaas well as increment the epoxy matrix compactness compared to the F-O-MXene (with broken nanosheetmorphology composed of TiO2 nanoparticles) due to rapid oxidation of the MXene nanosheets in theenvironment. Besides, the epoxy/F-MXene nanocomposite coating has slightly higher water contact angleand adhesion strength to the metallic substrate compared to the epoxy/F-O-MXene. The results of thisresearch clearly reveal the importance of preventing MXene oxidation before application as nanofillerin the polymer coatings.

Large-Dimensional Organic Semiconductor Crystals with Poly(butyl acrylate) Polymer for Solution-Processed Organic Thin Film Transistors

Yeqing Sun,Ziyang Zhang,Kyeiwaa Asare‑Yeboah,Sheng Bi,Zhengran He 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.1

Despite solution processed organic semiconductors have attracted much research attention, the randomized crystallizationand large prevalence of grain boundary remain as a challenge to realize high performance organic electronic applications. In this work, we report the incorporation of poly(butyl acrylate) polymer additive with organic semiconductors with themediation of a solvent vapor annealing method in order to modify the nucleation and crystal growth process. As 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) was experimented as a benchmark semiconductor, we demonstratedthat the TIPS pentacene/poly(butyl acrylate) mixture exhibits rigidly aligned crystals, large grain width and improved arealcoverage. In particular, thin film morphological characterization indicated a substantial reduction in misorientation angle byapproximately two orders of magnitude as well as a 5-fold enlargement of grain width. A grain boundary model is proposedas a theoretic basis to understand the connection between grain width and hole mobility. Bottom-gate, top-contact thin filmtransistors based on TIPS pentacene/poly(butyl acrylate) blends demonstrated enhanced hole mobility of up to 0.11 cm2/Vs.

Continuous Use Intention of Paid Reading Media: Influencing Factors, Mechanisms, and Improvement Paths --Empirical Research Based on Expectation Confirmation (ECT) Model

Congying Sun(손총영),Ziyang Liu(유자양) 한국컴퓨터정보학회 2024 韓國컴퓨터情報學會論文誌 Vol.29 No.1

The associations of obesity phenotypes with the risk of hypertension and its transitions among middle-aged and older Chinese adults

Ziyue Sheng,Shang Lou,Jin Cao,Weidi Sun,Yaojia Shen,Yunhan Xu,Ziyang Ren,Wen Liu,Qian Yi,Peige Song 한국역학회 2023 Epidemiology and Health Vol.45 No.-

OBJECTIVES: This study aimed to investigate the associations of obesity phenotypes with hypertension stages, phenotypes, and transitions among middle-aged and older Chinese. METHODS: Using the 2011-2015 waves of the China Health and Retirement Longitudinal Study, we conducted a cross-sectional analysis included 9,015 subjects and a longitudinal analysis included 4,961 subjects, with 4,872 having full data on the hypertension stage and 4,784 having full data on the hypertension phenotype. Based on body mass index and waist circumstance, subjects were categorized into 4 mutually exclusive obesity phenotypes: normal weight with no central obesity (NWNCO), abnormal weight with no central obesity (AWNCO), normal weight with central obesity (NWCO), and abnormal weight with central obesity (AWCO). Hypertension stages were classified into normotension, pre-hypertension, stage 1 hypertension, and stage 2 hypertension. Hypertension phenotypes were categorized as normotension, pre-hypertension, isolated systolic hypertension (ISH), isolated diastolic hypertension (IDH), and systolic-diastolic hypertension (SDH). The association between obesity phenotypes and hypertension was estimated by logistic regression. A comparison between different sexes was conducted by testing the interaction effect of sex. RESULTS: NWCO was associated with normal→stage 2 (odds ratio [OR], 1.95; 95% confidence interval [CI], 1.11 to 3.42), maintained stage 1 (OR, 1.62; 95% CI, 1.14 to 2.29), and normal→ISH (OR, 1.39; 95% CI, 1.05 to 1.85). AWCO was associated with normal→stage 1 (OR, 1.75; 95% CI, 1.40 to 2.19), maintained stage 1 (OR, 2.77; 95% CI, 2.06 to 3.72), maintained stage 2 (OR, 2.80; 95% CI, 1.50 to 5.25), normal→ISH (OR, 1.56; 95% CI, 1.20 to 2.02), and normal→SDH (OR, 2.54; 95% CI, 1.72 to 3.75). An interaction effect of sex existed in the association between obesity phenotypes and hypertension stages. CONCLUSIONS: This study highlights the importance of various obesity phenotypes and sex differences in hypertension progression. Tailored interventions for different obesity phenotypes may be warranted in hypertension management, taking into account sex-specific differences to improve outcomes.

Different divergence events for three pairs of PEBPs in Gossypium as implied by evolutionary analysis

Youjun Lu,Wei Chen,Lanjie Zhao,Jinbo Yao,Yan Li,Weijun Yang,Ziyang Liu,Yongshan Zhang,Jie Sun 한국유전학회 2019 Genes & Genomics Vol.41 No.4

Introduction The phosphatidylethanolamine-binding protein (PEBP) gene family plays a crucial role in seed germination, reproductive transformation, and other important developmental processes in plants, but its distribution in Gossypium genomes or species, evolutionary properties, and the fates of multiple duplicated genes remain unclear. Objectives The primary objectives of this study were to elucidate the distribution and characteristics of PEBP genes in Gossypium, as well as the evolutionary pattern of duplication and deletion, and functional differentiation of PEBPs in plants. Methods Using the PEBP protein sequences in Arabidopsis thaliana as queries, blast alignment was carried out for the identification of PEBP genes in four sequenced cotton species. Using the primers designed according to the PEBP genome sequences, PEBP genes were cloned from 15 representative genomes of Gossypium genus, and the gene structure, CDS sequence, protein sequence and properties were predicted and phylogenetic analysis was performed. Taking PEBP proteins of grape as reference, grouping of orthologous gene, analysis of phylogeny and divergence of PEBPs in nine species were conducted to reconstruct the evolutionary pattern of PEBP genes in plants. Results We identified and cloned 160 PEBPs from 15 cotton species, and the phylogenetic analysis showed that the genes could be classified into the following three subfamilies: MFT-like, FT-like and TFL1-like. There were eight single orthologous group (OG) members in each diploid and 16 double OG members in each tetraploid. An analysis of the expression and selective pressure indicated that expression divergence and strong purification selection within the same OG presented in the PEBP gene family. Conclusion An evolutionary pattern of duplication and deletion of the PEBP family in the evolutionary history of Gossypium was suggested, and three pairs of genes resulted from different whole-genome duplication events.

White-light crosslinkable milk protein bioadhesive with ultrafast gelation for first-aid wound treatment

Zhu Qinchao,Zhou Xuhao,Zhang Yanan,Ye Di,Yu Kang,Cao Wangbei,Zhang Liwen,Zheng Houwei,Sun Ziyang,Guo Chengchen,Hong Xiaoqian,Zhu Yang,Zhang Yajun,Xiao Ying,Valencak Teresa G.,Ren Tanchen,Ren Daxi 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00

Background : Post-traumatic massive hemorrhage demands immediately available first-aid supplies with reduced operation time and good surgical compliance. In-situ crosslinking gels that are flexibly adapting to the wound shape have a promising potential, but it is still hard to achieve fast gelation, on-demand adhesion, and wide feasibility at the same time. Methods : A white-light crosslinkable natural milk-derived casein hydrogel bioadhesive is presented for the first time. Benefiting from abundant tyrosine residues, casein hydrogel bioadhesive was synthesized by forming di-tyrosine bonds under white light with a ruthenium-based catalyst. We firstly optimized the concentration of proteins and initiators to achieve faster gelation and higher mechanical strength. Then, we examined the degradation, cytotoxicity, tissue adhesion, hemostasis, and wound healing ability of the casein hydrogels to study their potential to be used as bioadhesives. Result : Rapid gelation of casein hydrogel is initiated with an outdoor flashlight, a cellphone flashlight, or an endoscopy lamp, which facilitates its usage during first-aid and minimally invasive operations. The rapid gelation enables 3D printing of the casein hydrogel and excellent hemostasis even during liver hemorrhage due to section injury. The covalent binding between casein and tissue enables robust adhesion which can withstand more than 180 mmHg blood pressure. Moreover, the casein-based hydrogel can facilitate post-traumatic wound healing caused by trauma due to its biocompatibility. Conclusion : Casein-based bioadhesives developed in this study pave a way for broad and practical application in emergency wound management.