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Fu Yang,Gang Chen,Yu Kang,Dongmin Ma,Qilin Chen,Tian Tao,Fu Deliang 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.2
The U-Pb ages of single zircon grains contained in the sandstone samples were analyzed by the LA-ICP-MS method, the sediment provenances and geological significance were discussed. The LA-ICP-MS zircon U-Pb dating from the sandstones, tuffaceous sandstones and volcanic tuffs of the Pingliang and Zhaolaoyu Formations along the southwestern Ordos Block are used to limit the maximum depositional age and material sources. The results show that: (1) The youngest ages of zircon dating in the three samples are 445 Ma, 444 Ma and 443 Ma, respectively, suggesting that the studied Formations were deposited in the Late Ordovician. (2) The detrital zircon U-Pb age analysis of the sandstones sample from the Pinliang Formation clustered in the 445–477 Ma, 588–1548 Ma and 1612–2496 Ma with the corresponding youngest peak age of 454.5 ± 3.3 Ma. (3) The distribution of zircon U-Pb age in sandstone samples showing that the sedimentary rocks detritus was mainly sourced from the North Qinling-Qilian terranes and the NCC, and has double provenance supply in the north and south. The material source of the tuffaceous sandstones and volcanic tuffs mainly comes from the volcanic and magmatic activity related to the North Qilian-North Qinling Island Arcs.
Knitted Fabrics Made from Highly Conductive Stretchable Fibers
Ma, Rujun,Lee, Jiyong,Choi, Dongmin,Moon, Hyungpil,Baik, Seunghyun American Chemical Society 2014 NANO LETTERS Vol.14 No.4
<P>We report knitted fabrics made from highly conductive stretchable fibers. The maximum initial conductivity of fibers synthesized by wet spinning was 17460 S cm<SUP>–1</SUP> with a rupture tensile strain of 50%. The maximum strain could be increased to 490% by decreasing the conductivity to 236 S cm<SUP>–1</SUP>. The knitted fabric was mechanically and electrically reversible up to 100% tensile strain when coated by poly(dimethylsiloxane). The normalized resistance of the poly(dimethylsiloxane)-coated fabric decreased to 0.65 at 100% strain.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-4/nl404801t/production/images/medium/nl-2013-04801t_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl404801t'>ACS Electronic Supporting Info</A></P>
Lyophobized Ordered Mesoporous Silica Additives for Li-O<sub>2</sub> Battery Cathode
Roev, Victor,Ma, Sang Bok,Lee, Dong Joon,Im, Dongmin The Korean Electrochemical Society 2014 Journal of electrochemical science and technology Vol.5 No.2
The surface of an ordered mesoporous silica (OMS) was functionalized using 1H,1H,2H,2H-perfluorooctyltrimethoxysilane at $20^{\circ}C$ and $60^{\circ}C$. It was shown that only elevated temperature allows lyophobic properties on the walls of OMS, eventually preventing pore flooding with nonaqueous electrolytes. The functionalized OMSs (OMS-F) were characterized with various techniques: wettability test, $N_2$ sorption measurement, high-resolution transmission electron microscopy (HR-TEM). Cathodes of $10mg/cm^2$ loading were prepared with a commercial Pt/C catalyst and polyvinylidene fluoride (PVDF, 2.5 wt.%) binder using a typical doctor blade method on a commercial gas diffusion layer (GDL) in the presence or in the absence of OMS-F additives. Subsequent discharge-charge curves were taken in a 1M LiTFSI-TEGDME electrolyte at 60oC in pure oxygen atmosphere. It was found that the discharge capacity was significantly affected by OMS-F: 5 wt.% of additive extended discharge capacity by a factor 1.5. On the other hand, a similar OMS material but synthesized at $20^{\circ}C$ did not show lyophobic properties and deteriorated cathode capacity.
Acid-doped polyaniline membranes for solar-driven interfacial evaporation
Xia Li,Dongmin Yue,Fei Liu,Jingtong Yu,Bing-Bing Li,De Sun,Xin Ma 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.1
Interface solar desalination technology is an important green and sustainable strategy to solve the freshwater crisis. Herein, polyaniline (PANI) membranes were prepared by immersion precipitation phase inversion (NIPs) method and using for solar-driven water evaporation. To improve the light absorption rate of the PANI membrane, acid doping modification was carried out to the membrane. The results show that the polyaniline-p-toluene sulfonic acid (PANI-PTSA) membrane modified by p-toluene sulfonic acid (PTSA) has microporous structure, and the hydrophilicity was greatly improved after modification. The water evaporation rate and solar energy conversion efficiency of PANI-PTSA membrane were 1.38 kg/(m2h) and 80.7% under 1 kW/m2 sunlight irradiation, respectively, significantly improved compared to the original membrane. Due to the electrostatic repulsion effect of PANI-PTSA on anion charged SO − 3 , Na+ is separated from Cl−, which reduces the salt crystallization in the evaporator, indicating that PANI-PTSA membrane has certain salt resistance in solar desalination experiments. This work provides a simple method to prepare the PANI-PTSA membrane with high efficiency and salt resistance that has huge potential for practical application of interface solar desalination technology.
아키살롱 - 주거복지와 공동체 회복, 사회문제를 해결하고 극복하는 '건축'
강영구,류가영,마동민,Kang, Youngkoo,Ryu, Gayeong,Ma, Dongmin 대한건축사협회 2020 建築士 Vol.613 No.-
건축은 필연적으로 공공성에 대해 고민하고 풀어가야 한다. 우리는 건축이 사회문제로부터 직접적인 피해를 받는 약자와 소수자에게 도움이 된, 나아가 문제를 해결하고 극복할 수 있도록 긍정적 영향을 미친 사례를 소개하고자 한다.