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- 저자 : Wu Dongliang (검색결과 5 건)
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Wu Dongliang,Xing Yuxuan,Zhang Denglu,Hao Zhenna,Dong Qi,Han Yongqin,Liu Lei,Wang Maoju,Zhang Ruliang 한국탄소학회 2024 Carbon Letters Vol.34 No.1
In this work, the trend in the performance of carbon fiber (CF) and its composite during self-polymerization of polydopamine (PDA) at carbon fiber surface was investigated by varying the self-polymerization time of dopamine in an aqueous solution. Research has shown that the PDA coating elevated the surface roughness and polarity of the inert fiber. The tensile strength of single carbon fiber was significantly improved, especially after 9 h of polydopamine self-polymerization, increasing by 18.64% compared with that of desized carbon fiber. Moreover, the interlaminar shear strength (ILSS) of CF-PDA9-based composites was 35.06% higher than that of desized CF-based composites. This research will provide a deep insight into the thickness and activated ingredients of dopamine oxidation and self-polymerization on interfacial compatibility of carbon fiber/epoxy resin composites.
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Facile and Eco-Friendly Preparation of GO/BIIR Composite for Gas Barrier Applications
Jie Wu,Qin He,Yingjun Li,Dongliang Liu,Yuanlin Zhou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.2
Owing to weak interfacial bonding and incompatibility between graphene and polymer, there are several challenges in the fabrication of graphene-based polymer composites with an effective gas barrier. Hence, it is necessary to enhance the affinity between polymers and graphene. We selected graphene oxide (GO) as filler and brominated butyl rubber (BIIR) as a substrate to prepare GO/BIIR composites via the simple latex mixed route. The tortuous path of diffusion of helium molecules is extended after insertion of GO nanosheets, thus improving the gas barrier of composites. GO/BIIR composite with the GO content of 0.3 wt.% exhibits favorable barrier efficiency to helium with a helium gas transmission rate of 12.79 cm3 cm m -2 day -1 bar -1.
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Xingxing Li,Dongliang Liu,Zhaowei Wu,Dan Li,Yifei Cai,Yao Lu,Xin Zhao,Huping Xue 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.4
Laccases are multicopper oxidases with important industrial value. In the study, a novel laccase gene (mco) in a Staphylococcus haemolyticus isolate is identified and heterologously expressed in Escherichia coli. Mco shares less than 40% of amino acid sequence identities with the other characterized laccases, exhibiting the maximal activity at pH 4.0 and 60oC with 2,2'-azino-bis (3- ethylbenzothiazoline-6-sulphonic acid) diammonium salt (ABTS) as a substrate. Additionally, the Mco is tolerant to a wide range of pH, heavy metal ions and many organic solvents, and it has a high decolorization capability toward textile dyes in the absence of redox mediators. The characteristics of the Mco make this laccase potentially useful for industrial applications such as textile finishing. Based on BLASTN results, mco is found to be widely distributed in both the bacterial genome and bacterial plasmids. Its potential role in oxidative defense ability of staphylococci may contribute to the bacterial colonization and survival.
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Molecular dynamics simulation of nanoindentation influence of indenter velocity on 3C-SiC ceramics
Yu Dongling,Liu Dongliang,Yi Jiaqi,Zhou Jianzhen,Wu Nanxing 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.2
To investigate the effect of nanoindentation velocity on dislocation nucleation, development and elastic deformation of 3C-SiCceramic specimens, the nanoindentation loading process of 3C-SiC ceramic specimens under a diamond indenter is simulated. The molecular dynamics models of diamond indenter and 3C-SiC amorphous layer are constructed, and the nanoindentationconditions such as potential function, relaxation synthesis and time step are optimized. The dislocation analysis method andthe identify diamond structure method are used to analyze the internal structure change of the specimen and the dislocationgeneration, change and transfer of different positions after nanoindentation simulation. It is found that with the increase ofindenter velocity, the elastic threshold decreases and the plasticity increases, and tends to be stable at a certain stage. The loadfluctuation tends to be flat, the total amount of dislocation generated continues to decrease, and the diffusion rate of dislocationslows down. The length of 1/2<110> and 1/6<112> type dislocation becomes shorter, indentation formation of the 'lotus' shapemore regularly. The elastic-plastic threshold of 3C-SiC ceramic material also changes with the change of indenter velocity, andthe dislocation formation rate and total amount also affect while show a certain regularity.
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Oide, Shinichi,Liu, Jinyuan,Yun, Sung-Hwan,Wu, Dongliang,Michev, Alex,Choi, May Yee,Horwitz, Benjamin A.,Turgeon, B. Gillian American Society for Microbiology 2010 EUKARYOTIC CELL Vol.9 No.12
<B>ABSTRACT</B><P>Histidine kinase (HK) phosphorelay signaling is a major mechanism by which fungi sense their environment. The maize pathogen Cochliobolus heterostrophus has 21 HK genes, 4 candidate response regulator (RR) genes (<I>SSK1</I>, <I>SKN7</I>, <I>RIM15</I>, <I>REC1</I>), and 1 gene (<I>HPT1</I>) encoding a histidine phosphotransfer domain protein. Because most HKs are expected to signal through RRs, these were chosen for deletion. Except for pigment and slight growth alterations for <I>rim15</I> mutants, no measurable altered phenotypes were detected in <I>rim15</I> or <I>rec1</I> mutants. Ssk1p is required for virulence and affects fertility and proper timing of sexual development of heterothallic C. heterostrophus. Pseudothecia from crosses involving <I>ssk1</I> mutants ooze masses of single ascospores, and tetrads cannot be found. Wild-type pseudothecia do not ooze. Ssk1p represses asexual spore proliferation during the sexual phase, and lack of it dampens asexual spore proliferation during vegetative growth, compared to that of the wild type. <I>ssk1</I> mutants are heavily pigmented. Mutants lacking Skn7p do not display any of the above phenotypes; however, both <I>ssk1</I> and <I>skn7</I> mutants are hypersensitive to oxidative and osmotic stresses and <I>ssk1 skn7</I> mutants are more exaggerated in their spore-type balance phenotype and more sensitive to stress than single mutants. <I>ssk1</I> mutant phenotypes largely overlap <I>hog1</I> mutant phenotypes, and in both types of mutant, the Hog1 target gene, <I>MST1</I>, is not induced. <I>ssk1</I> and <I>hog1</I> mutants were examined in the homothallic cereal pathogen Gibberella zeae, and pathogenic and reproductive phases of development regulated by Ssk1 and Hog1 were found to mirror, but also vary from, those of C. heterostrophus.</P>
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