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Muthukumar, P.,Kim, H. S.,Ku, K. S.,Park, J. H.,Son, Y. A. THE KOREAN FIBER SOCIETY 2016 FIBERS AND POLYMERS Vol. No.
<P>The synthesis of two new phthalocyanine precursors 4-(3-(piperidin-1-yl)phenoxy) with mono (2) and trichloro (3) substituents were carried out in this work. Cyclotetramerization of these precursors with zinc acetate gave novel tetrakis-4-(3-(piperidin-1-yl)phenoxy) with tetra (4) and dodecachloro (5) substituted zinc phthalocyanines. The synthesized new compounds were characterized using FT-IR, H-1 NMR, electronic absorption spectroscopy, mass spectra and elemental analysis. The aggregation behavior of zinc phthalocyanines 4 and 5 was investigated in different concentrations of dichloromethane (DCM). Zino phthalocyanines 4 and 5 showed good solubility in different organic solvents such as DCM, CHCl3, THE, benzene and toluene. Further, the aggregation behavior of zinc phthalocyanines 4 and 5 was studied before and after the addition of Triton X100. Further, the fluorescence quantum yields of zinc phthalocyanines 4 and 5 were calculated in the presence and absence of Triton X100.</P>
Durable keratin-based bilayered electrospun mats for wound closure
Singaravelu, Sivakumar,Ramanathan, Giriprasath,Muthukumar, Thangavelu,Raja, M. D.,Nagiah, Naveen,Thyagarajan, Sitalakshmi,Aravinthan, Adithan,P., Gunasekaran,Natarajan, T. S.,V. N. Geetha Selva, Ganga The Royal Society of Chemistry 2016 Journal of Materials Chemistry B Vol.4 No.22
<P>A bilayered nanofibrous scaffold with rapid wound healing properties is found to be suitable for tissue regeneration applications. The objective of this study is to reveal the fabrication of a poly(3-hydroxybutyric acid) (P)-gelatin (G) nanofibrous mat through electrospinning, with a horn keratin-chitosan-based biosheet (KC) as a bilayered nanofibrous scaffold. The mupirocin (D)-loaded horn KC biosheet (KCD) acts as the primary layer over which PG nanofibers were electrospun to act as the secondary layer. It is shown that this engineered bilayered nanofibrous scaffold material (KC-PG) should fulfill the functions of the extracellular matrix (ECM) by elucidating its function<I>in vitro</I>and<I>in vivo</I>. The bilayered nanofibrous scaffold was designed to exhibit improved physiochemical, biological and mechanical properties, with better swelling and porosity for enhanced oxygen permeability, and it also exhibits an acceptable antibacterial property to prevent infection at the wound site. The bilayered nanofibrous scaffold assists in better biocompatibility towards fibroblast and keratinocyte cell lines. The morphology of the nanofibrous scaffold aids increased cell adhesion and proliferation with cell material interactions. This was elucidated with the help of<I>in vitro</I>fluorescence staining against both cell lines. The bilayered KCD-PG nanofibrous scaffold material gives accelerated wound healing efficiency during<I>in vivo</I>wound healing. The results showed the regulation of growth factors with enhanced collagen synthesis, thereby helping in faster wound healing.</P>
Muthukumar, P.,Padmasuresh, L.,Eswaramoorthy, K.,Jeevananthan, S. The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.2
The inverted sine carrier-based pulse width modulation scheme has been acknowledged for fundamental fortification in DC-AC conversion. This paper suggests a randomized inverted sine carrier for the half-controlled PWM switching strategy of a three-phase voltage source inverter to enhance its ability to spread harmonic power. A detailed study of the proposed modulation technique is presented through MATLAB-Simulink, and switching pulses are generated in the ModelSim digital environment. Harmonic analyses and assessments of different performance measures such as power spectrum density, harmonic spread factor, total harmonic distortion and dominating harmonic orders for various modulation indices have been carried out. Simulation and experimental results show that the proposed PWM method can spread harmonic power in output voltage better than the conventional SPWM or SVPWM. For real-time digital implementation, the gating signals are generated using a field-programmable gate array Spartan XC3S500E-320F device.
K. Subramanian,P. Muthukumar,주영훈 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.2
This paper investigates the consensus problem of continuous-time leader-following nonlinear multi-agentsystems with time-varying communication delay via reliable control. The parameter uncertainty is assumed to bebounded in given compact sets. With certain assumptions on the dynamic nonlinearity and underlying topology,the sufficient conditions are derived in terms of linear matrix inequality (LMI) by using a suitable Lyapunov-Krasovskii functional (LKF). It is ensure that the leader-following consensus can be achieved under the proposedreliable control scheme. Finally, numerical simulation results are presented to demonstrate the theoretical results.
Optimization of active area of proton exchange membrane fuel cell with better water management
M. Karthikeyan,M. Muthukumar,P. Karthikeyan,C. Mathan 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5
Water flooding is one of the major issues which is influencing the performance of PEMFC, while scaling up the active area. Water accumulation in between the GDL and cathode flow field landing in PEMFC can be removed by fixing porous inserts along the landing area of the cathode flow field. In this paper, the optimum active area of the PEMFC is found from the experimental investigations of three active area sizes of 25 cm2, 36 cm2 and 70 cm2 with better water management by fixing porous inserts along the landing surface. All three active areas of PEMFCs with three different flow fields viz. Serpentine; Uniform and Stagger patterned pin types having porous inserts on cathode side have been investigated experimentally. The PEMFCs with active area of 25 cm2, 36 cm2 and 70 cm2 with stagger patterned pin types having porous inserts have obtained maximum power densities as 0.270 W/cm2, 0.338 W/cm2and 0.170 W/cm2 respectively. The PEMFC with active area of 36 cm2 yields higher power density compared to 25 cm2 and 70 cm2 PEMFCs. So it is found that the active area of 36 cm2 is the optimum active area of single cell PEMFC for maximum performance.