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Zhun Li,Yu Zhao,Ying Wang,Shaomin Zhu 한국고분자학회 2020 폴리머 Vol.44 No.2
A novel pyridine-containing aromatic diamine monomer, 2,2′-bis[4-(6-amino-3-pyridinoxy) phenyl] propane, was synthesized through nucleophilic substitution reaction. A series of polyimides (PIs) were obtained by the polycondensation reaction of synthesized monomer with four commercial dianhydrides. The structure and properties of the resulting PIs were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetric analysis, dynamic mechanical thermal analysis, thermogravimetric analysis, and X-ray diffraction. The PIs exhibited good thermal stability with glass transition temperature of 231 to 303℃ by DSC and 205 to 274℃ by DMA. The temperature at 5% weight loss was 478 to 501℃ in nitrogen atmosphere, and the residual mass range at 800℃ was 42-55%. The excellent mechanical properties included tensile strength of 98-102 MPa, elongation at break of 6-18%, and tensile modulus of 2.8- 3.0 GPa. The cut-off wavelength ranged from 391-440 nm, indicating that the resulting PIs had desirable optical performance.
Study of Thermal Stability of Ni Silicide using Ni-V Alloy
Zhun Zhong,Soon-Young Oh,Won-Jae Lee,Ying-Ying Zhang,Soon-Yen Jung,Shi-Guang Li,Ga-Won Lee,왕진석,이희덕,Yeong-Cheol Kim 한국전기전자재료학회 2008 Transactions on Electrical and Electronic Material Vol.9 No.2
In this paper, thermal stability of Nickel silicide formed on p-type silicon wafer using Ni-V alloy film was studied. As compared with pure Ni, Ni-V shows better thermal stability. The addition of Vanadium suppresses the phase transition of NiSi to NiSi₂ effectively. Ni-V single structure shows the best thermal stability compared with the other Ni-silicide using TiN and Co/TiN capping layers. To enhance the thermal stability up to 650 ˚C and find out the optimal thickness of Ni silicide, different thickness of Ni-V was also investigated in this work.
Gu, Zhun World Association for Triple Helix and Future Stra 2018 Journal of Contemporary Eastern Asia Vol.17 No.1
Produced by Chinese local television stations, Maritime Silk Road is a documentary which adopts ancient Maritime Silk Road as a historical nostalgia to interpret "the Belt and Road Initiative", a contemporary Chinese economic, political, and cultural strategy put forward by Chinese government mainly aiming at the countries of Southeast Asia. The main body of this article has three parts and the first part analyses how the documentary adopts computer-generated imagery (CGI) to create a historical nostalgia about ancient Maritime Silk Road in the period of Imperial China. At the same time, this part also presents a sense of diasporic nostalgia of the overseas Chinese. This historical and diasporic nostalgia is related to Chinese President Xi Jinping's political discourse: "Chinese dream" that propagandises to build a strong China put forward by Xi in 2013. The second part analyses how this historical and diasporic nostalgia legitimates Xi's "Chinese dream" and how it responds to recent territorial dispute when China continuously claims its territorial sovereignty in the South China Sea. In this light, the documentary repeatedly mentions two political rhetoric: "coexistence" (gongcun) and "mutual benefit"(huli gongying) as a practical strategy to deal with the dispute between China and some countries of Association of Southeast Asian Nations (ASEAN). In the third section, the concept of "community of common destiny" (mingyun gongtongti) is adopted by the documentary to depict a convenient and effective organization of China and ASEAN, which is framed as an ultimate goal that Chinese government is depicted as the potential leader of this nostalgic community. At the same time, by providing different and even opposite viewpoints, this article discusses three controversial political rhetoric to present how historical and diasporic nostalgia is politicalized and served for Chinese diplomacy and national interest. Overall, this article argues that the documentary creates a glorious ancient Maritime Silk Road, as a sense of nostalgia, to expand China's economic and political influence, to respond to the controversial issues, and to reassert China's leadership as the centre of Asia.
Synthesis of Silver Nanoplates by Two-Dimensional Oriented Attachment
Liu, Zhun,Zhou, Hu,Lim, Young S.,Song, Jung-Hoon,Piao, Longhai,Kim, Sang-Ho American Chemical Society 2012 Langmuir Vol.28 No.25
<P>Synthesis of silver nanoplates was studied in the modified polyol method, where the nucleation and seed stage occurred in a poly(ethylene glycol) (PEG)–water mixture solution, and the growth stage happened in the PEG environment. The morphological evolution of nanoplates was characterized using UV, SEM, and TEM. Interestingly, plane nanostructures with unusual jagged edges were finally formed in our modified polyol method. Using TEM, we observed the medium state of fusion between two nanoplates, resulting in generating unusual jagged edges. Therefore, a novel two-dimensional oriented attachment occurred in our modified polyol method, which involves smaller nanoplates as the building blocks. Further control experiments showed that the presence of water could break this kinetic preferred reactivity, leading to the formation of nanoparticles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2012/langd5.2012.28.issue-25/la301721y/production/images/medium/la-2012-01721y_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la301721y'>ACS Electronic Supporting Info</A></P>
북한강 수계 조류대발생 원인종 남조 Anabaena의 분자계통학적 검토
이준 ( Zhun Li ),한명수 ( Myung Soo Han ),황수옥 ( Su Ok Hwang ),변명섭 ( Myeong Seop Byeon ),황순진 ( Soon Jin Hwang ),김백호 ( Baik Ho Kim ) 한국하천호수학회 2013 생태와 환경 Vol.46 No.2
Between May and August 2012, a massive cyanobacterial bloom with Anabaena has been occurred throughout the North Han River. Sampling was conducted at one station on each lake, L. Uham, L. Cheongpyung, and L. Paldang, where occurred a dense bloom, in 13 July. According to the microscopic examination, the blooms was dominated by one specific filamentous cyanobacterium Anabaena and other phytoplankton. Morphologically, previous literature proven that this Anabaena species is A. crassa (Lemmermann) Komark.-Legn. & Cronberg. However, identification of species in a mixed population is complicated due to limited morphological differences. Therefore, with live sample including trichome, akinete and heterocyst, the sequences of 16S rRNA gene of Anabaena isolates were cloned and analyzed, and three 16S rRNA gene sequences of 1188~1520 bp in length were obtained. It was shown from the homologous analysis results that the obtained 16S rRNA sequences were highly homologous to the relevant sequences of A. crassa in GenBank. The 16S rRNA sequences of 63 species were retrieved from GenBank, and the phylogenetic tree was constructed by using these sequences.