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Boost Up the Mechanical and Electrical Property of CNT Fibers by Governing Lyotropic Liquid Crystalline Mesophases with Aramid Polymers for Robust Lightweight Wiring Applications

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Advanced Fiber Materials 2023年第2期5卷 514-526页

作者： Ki‑Hyun Ryu Jeong‑Gil Kim Dongju Lee Seo Gyun Kim bon‑cheol ku Jun Yeon Hwang Kwang‑Un Jeong Nam Dong Kim Dae‑Yoon Kim Functional Composite Materials Research Center Korea Institute of Science and TechnologyWanju 55324Republic of Korea Carbon Composite Materials Research Center Korea Institute of Science and TechnologyWanju 55324Republic of Korea Department of Polymer‑Nano Science and Technology Department of Nano Convergence EngineeringJeonbuk National UniversityJeonju 54896Republic of Korea Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea

Monofilament type of polyaromatic amide(PA)and carbon nanotube(CNT)composite fibers is presented.A concept of a lyotropic liquid crystal(LLC)constructed via a spontaneous self-assembly is introduced to mitigate the extremely low com-patibility between PA and *** approaches provide an effective co-processing route of PA and CNT simultaneously to fabricate the uniform,continuous,and reliable composite fibers through a ***,the addition of a small amount PA into the dope solution of CNT governs the LLC mesophase not only in a spinneret stage but also in a coagulant ***,the developed PA/CNT composite fibers have the high uniaxial orientational order and the close interfacial packing compared to the pure CNT *** PA/CNT composite fibers achieve the outstanding tensile strength,electrical conductivity,and electrochemical response,while maintaining a *** also exhibit the chemical,mechanical,and thermal *** of these advantages can make flexible,sewable,and washable PA/CNT composite fibers ideal nanocomposite materials for use in next-generation information and energy transporting system by replacing conventional metal electrical conductors.

关键词： Carbon nanotube Aramid polymer Liquid crystal Composite fiber Electrical wire

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Structural Evolution of Polyacrylonitrile Fibers in Stabilization and Carbonization

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Advances in Chemical Engineering and Science 2012年第2期2卷 275-282页

作者： Sungho Lee Jihoon Kim bon-cheol ku Junkyung Kim Han-Ik Joh Institute of Advanced Composite Materials Korea Institute of Science and Technology Jeollabuk-do Korea (South) Korea Institute of Science and Technology Seoul Korea (South)

The effect of structural evolution polyacrylonitrile (PAN) on mechanical properties was investigated in stabilization and carbonization. PAN spun fibers were stabilized in a convection oven with a constant tension for various times at 250℃. Fourier Transform Infrared spectroscopy (FTIR) and gel fraction results suggested that intra and intermolecular stabilization reactions occurred simultaneously. X-ray diffractograms revealed a disruption of crystalline structure and an appearance of pre-graphitic structure of PAN fibers due to stabilization. These structural changes by stabilization resulted in the significant decrease of tensile properties of fibers. In Raman spectra with heat treated fibers from 400℃ up to 1200℃, the intensity ratio of the D to G bands (ID/IG) decreased as heat treatment temperature increased, indicating an increase of basal plane of graphitic layer of heat treated fibers. Tensile strength of heat treated fibers at 1200℃ was found to be as high as 2.2 GPa.

关键词： Polyacrylonitrile Stabilization Carbonization XRD Tensile Properties Carbon Fibers

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Effect of Curing Poly(<i>p</i>-Phenylene Sulfide) on Thermal Properties and Crystalline Morphologies

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Advances in Chemical Engineering and Science 2013年第2期3卷 145-149页

作者： Sungho Lee Do-Hwan Kim Jae-Ha Park Min Park Han-Ik Joh bon-cheol ku Carbon Convergence Materials Research Center Institute of Advanced Composites Materials Korea Institute of Science and Technology Wanju-gun Republic of Korea

Commercial poly(p-phenylene sulfide) (PPS) was thermally cured, which resulted in an increase of molecular weight due to cross-linking. Non-isothermal crystallization studies of samples cured for up to 7 days at 250?C showed a monotonous increase of crystallization temperature compared to pure PPS. However, a further increase of curing time decreased the crystallization temperature. The change in the half-crystallization time (t1/2) was similar to the crystallization temperature. Thus, the cross-linking of PPS affected crystallization behaviors significantly. To a certain extent, crosslinks acted as nucleation agents, but excessive cross-linking hindered the crystallization. Morphologies observed by polarized optical microscopy suggested that thermal curing for as little as 1 day contributed to the spherulitic structure having a smaller size, that was not observed with pure PPS.

关键词： Poly(p-Phenylene Sulfide) Thermal Curing Non-Isothermal Crystallization Cross-Linking Crystalline Morphologies

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Combination of Korean Red Ginseng Extract and Hydrogen-Rich Water Improves Spermatogenesis and Sperm Motility in Male Mice

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Chinese Journal of Integrative Medicine 2020年第5期26卷 361-369页

作者： Ja Yoon ku Min Jung Park Hyun Jun Park Nam cheol Park Bo Sun Joo Department of Urology Pusan National University HospitalPusan National University School of MedicineBusan(49241)Republic of Korea Biomedical Research Institute Pusan National University HospitalBusan(49241)Republic of Korea The Korea Institute for Public Sperm Bank Busan(49241)Republic of Korea

Objective: To investigate the effect of hydrogen-rich Korean Red Ginseng(KRG) water(HRGW) mixture on the spermatogenesis and sperm motility of mice of different ages. Methods: Eighty young(3 month-old) and aged(12 month-old) male mice were randomly assigned to 4 groups(n=10 per group) including control group, hydrogen-rich water(HRW) group(10 m L/kg daily), KRG group(50 mg/kg daily) and HRGW group(10 m L/kg HRW and 50 mg/kg KRG daily) by an oral zoned needle for 4 weeks. Sperm count and motility were measured using sperm suspension released from cauda epididymis. Serum follicle stimulating hormone(FSH), luteinizing hormone(LH), testosterone, and reactive oxygen species(ROS) in serum have also been estimated. Tubular changes were examined through histological hematoxylin and eosin staining. Expression of antioxidation(PPx3, PPx4, GSTm5 and GPx4), spermatogenesis(inhibin-α, neptin-2 and CREM), antiaging(SIRT1 and SIRT2), and angiogenesis [visfatin and vascular endothelial growth factor(VEGF)] related genes were examined through realtime polymerase chain reaction. Results: HRW and KRG treatment stimulated spermatogenesis followed by increasing sperm production and sperm motility(P<0.05). These effects were strengthened synergistically by a HRGW mixture(P<0.05 or P<0.01). HRGW greatly increased the expressions of antioxidation, antiaging, spermatogenesis related genes and VEGF especially in aged mice(P<0.05). Serum testosterone and FSH levels also increased, while serum ROS level decreased(all P<0.05). Conclusion: HRGW increases sperm production and motility by enhancing antioxidation and stimulating spermatogenesis and sex hormone production, particularly in aged mice.

关键词： aging ginseng infertlit mineral waters sperm mtility

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Regulation of c-SMAC formation and AKT-mTOR signaling by the TSG101-IFT20 axis in CD4^(+)T cells

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Cellular & Molecular Immunology 2023年第5期20卷 525-539页

作者： Jiung Jeong In Kang Yumin Kim Keun bon ku Jang Hyun Park Hyun-Jin Kim Chae Won Kim Jeongwoo La Hi Eun Jung Hyeon cheol Kim Young Joon Choi Jaeho Kim Joon Kim Heung Kyu Lee Graduate School of Medical Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Internal Medicine Seoul National University HospitalSeoul 03080Republic of Korea Department of Biological Sciences KAISTDaejeon 34141Republic of Korea Department of Convergent Research of Emerging Virus Infection Korea Research Institute of Chemical TechnologyDaejeon 34114Republic of Korea.

CD4^(+)T cells play major roles in the adaptive immune system,which requires antigen recognition,costimulation,and cytokines for its elaborate *** studies have provided new insight into the importance of the supramolecular activation cluster(SMAC),which comprises concentric circles and is involved in the amplification of CD4^(+)T cell ***,the underlying mechanism of SMAC formation remains poorly ***,we performed single-cell RNA sequencing of CD4^(+)T cells left unstimulated and stimulated with anti-CD3 and anti-CD28 antibodies to identify novel proteins involved in their *** found that intraflagellar transport 20(IFT20),previously known as cilia-forming protein,was upregulated in antibody-stimulated CD4^(+)T cells compared to unstimulated CD4^(+)T *** also found that IFT20 interacted with tumor susceptibility gene 101(TSG101),a protein that endocytoses ubiquitinated T-cell *** interaction between IFT20 and TSG101 promoted SMAC formation,which led to amplification of AKT-mTOR ***,IFT20-deficient CD4^(+)T cells showed SMAC malformation,resulting in reduced CD4^(+)T cell proliferation,aerobic glycolysis,and cellular ***,mice with T-cell-specific IFT20 deficiency exhibited reduced allergen-induced airway ***,our data suggest that the IFT20-TSG101 axis regulates AKT-mTOR signaling via SMAC formation.

关键词： CD4^(+)T cell Intraflagellar transport 20 Tumor susceptibility gene 101 AKT-mTOR signaling Asthma Supramolecular activation cluster

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The Mystery 40 Hz:Unraveling the Efficacy of Rhythmic Stimulation in Alzheimer's Disease

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Neuroscience Bulletin 2024年第6期40卷 831-834页

作者： Yixuan ku Guangdong Provincial Key Laboratory of Brain Function and Disease Center for Brain and Mental Well-beingDepartment of PsychologySun Yat-sen UniversityGuangzhou510006China Peng Cheng Laboratory Shenzhen518000China

Promises and Challenges of Rhythmic *** advances in research have made significant strides in understanding the potential of 40 Hz rhythmic optogenetic stimulation for the treatment of Alzheimer's disease(AD).A pivotal study conducted by Iaccarino et al.(2016)unveiled that targeted stimulation of interneurons at this specific frequency results in a remarkable reduction ofβ-amyloid levels in a mouse model of AD[1].

关键词： stimulation Alzheimer

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Selective reduction of NO by photo-SCR with ammonia in an annular fixed-film photoreactor

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Frontiers of Environmental Science & Engineering 2012年第2期6卷 149-155页

作者： YiangChen CHOU Young ku Department of Chemical Engineering Taiwan University of Science and Technology Taipei 10607 China

Gaseous NO was photocatalytically reduced at room temperature by photo-assisted selective catalytic reduction （photo-SCR） with ammonia over TiO2 in this study. NO reduction efficiency and N2 selectivity were determined from gases composition at the outlet stream of photoreactor. Effect of operating conditions, e.g. light intensity and inlet concentrations of ammonia and oxygen, on the NO reduction efficiency and N2 selectivity were discussed to determine the feasible operating condition for photocatalytic reduction of NO. Experimental results showed that selective catalytic reduction of NO with ammonia over TiO2 in the presence of oxygen was a spontaneous reaction in dark. The photoirradiation on the TiO2 surface caused remarkable photocatalytic reduction of NO to form N2, NO2, and N20 under 254 nm UV illuminations, while almost 90% of N2 selectivity was achieved in this study. The ammonia and oxygen molecules played the roles of reductant and oxidant for NO reduction and active sites regeneration, respectively. The reduction of NO was found to be increased with the increase of inlet ammonia and oxygen concentrations until specific concentrations because of the limited active sites on the surface of TiO2. The kinetic model proposed in this study can be used to reasonably describe the reaction mechanism of photo-SCR.

关键词： photo-SCR photocatalysis NO reduction,Eley-Rideal model

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SOLUTION OF THE ENSO DELAYED OSCILLATOR WITH HOMOTOPY ANALYSIS METHOD

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Journal of Hydrodynamics 2009年第1期21卷 131-135页

作者： WU Zi-ku School of Science Qingdao Agriculture University Qingdao 266109 China

An ENSO delayed oscillator is considered. The E1 Nino atmospheric physics oscillation is an abnormal phenomenon involved in the tropical Pacific ocean-atmosphere interactions. The conceptual oscillator model should consider the variations of both the eastern and western Pacific anomaly patterns. Using the homotopy analysis method, the approximate expansions of the solution of corresponding problem are constructed. The method is based on a continuous variation from an initial trial to the exact solution. A Maclaurin series expansion provides a successive approximation of the solution through repeated application of a differential operator with the initial trial as the first term. This approach does not require the use of perturbation parameters and the solution series converges rapidly with the number of terms. Comparing the approximate analytical solution by homotopy analysis method with the exact solution, we can find that the homotopy analysis method is valid for solving the strong nonlinear ENSO delayed oscillator model.

关键词： ENSO delayed oscillator homotopy analysis method strong nonlinear

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Mixture flow of particles and power-law fluid in round peristaltic tube

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Applied Mathematics and Mechanics(English Edition) 2019年第6期40卷 805-822页

作者： Hailin YANG Jianzhong LIN Xiaoke ku Institute of Fluid Engineering School of Aeronautics and AstronauticsZhejiang University

The erythrocyte and blood flowing in the blood vessel can be treated as the two-phase flow of the mixture of particles and a power-law fluid in a peristaltic *** the present work, the peristaltic transport of a power-law fluid and the suspension of particles in a tube is investigated by a perturbation method using the long wavelength approximation. The influence of different parameters on the velocity profile and streamlines is explored. Results show that there is a deflection of the flow field when the power-law index n = 0.5 or 1.5 compared with the Newtonian fluid where the trapping zone is symmetric to a certain cross section. The flux rate and reflux of the material are identified,and the conditions under which the reflux appears are determined. Moreover, a reflux phenomenon occurs near the wall. The trapping zone is related to not only the tube geometry and the flow flux but also the fluid properties. Both the length and width of the trapping zone increase with an increase in θ or φ. The trapping zone is more difficult to produce in the shear-thinning fluid than the shear-thickening fluid.

关键词： peristaltic transport two-phase flow power-law fluid perturbation method trapping phenomenon

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Nearly degenerate ground states of a checkerboard antiferromagnet and their bosonic interpretation

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 84-89页

作者： Haiyuan Zou Fan Yang Wei ku Key Laboratory of Polar Materials and Devices(MOE) School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Department of Physics Beijing Institute of TechnologyBeijing 100081China Tsung-Dao Lee Institute Shanghai 200240China Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education) Shanghai 200240China Shanghai Branch Hefei National LaboratoryShanghai 201315China

The spin-1/2 model system with antiferromagnetic(AF) couplings on a J1-J2checkerboard lattice, known as the planar pyrochlore model, is strongly frustrated and associated with a two-to-one dimensional crossover. Using the Projected Entangled Simplex States tensor network ansatz, we identify a large number of nearly degenerate states in the frustrated region(J_(1)bond solid(VBS) state to be the ground state at J_(1)≤J_(2), while various 1D AF correlated states take over the rest. We verify the stability of the VBS state against nematic perturbation. The corresponding bosonic picture provides an intuitive understanding of the low-energy physics. Particularly, it predicts weaker VBS states in the easy-plane limit, which we confirm numerically. Our results clarify the most essential ground state properties of this interesting system and demonstrate the usefulness of bosonic picture in dealing with frustrated magnetism.

关键词： tensor networks frustrated magnetism dimensional crossover degenerate states

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