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Padmini. E,Helen Kalavathy M,Lima Rose Miranda 한국탄소학회 2008 Carbon Letters Vol.9 No.2
In the present study Sisal fiber obtained from the leaves of Agave sisalana has been chosen to validate its viability as anadsorption of Nickel was also studied. Agave sisalana fiber was found to be a cheap and effective adsorbent doing away withthe need to activate the material therby reducing processing cost. The equilibrium studies indicated that the adsorptioncapacity of raw fiber and the surface modified fiber was 8.66 and 9.77 mg/g respectively with the Langmuir isothermdescribing the adsorption phenomena better than the Freundlich and Temkin isotherm. The adsorption was found to beexothermic from the thermodynamic studies and the kinetics showed that the adsorption phenomena were second order.
Nanoneedle-structured Anode Catalyst for Low-Temperature Proton Exchange Membrane Fuel Cells
Padmini Basumatary,Dimpul Konwar,윤영수 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.6
A new state-of-the-art NiMnCo anode co-catalyst has been prepared and investigated with the aim of reducing dependence on expensive Pt catalysts in hydrogen-based fuel cells. The as-prepared co-catalyst exhibited a three dimensional (3D) nanoneedle structure, which was observed using transmission electron microscopy. Pt nanoparticles (approximately 10 wt %) were deposited on the surface of the 3D NiMnCo nanoneedles to further increase their electrocatalytic activity, and the performance of membrane-electrode-assemblies based on the Pt@NiMnCo and NiMnCo anode catalysts was evaluated. The peak power densities of the Pt@NiMnCo- and NiMnCo- based fuel cells were found to be 352.64 and 299.78?mW/cm2, respectively, at 80 °C. Furthermore, the Pt@NiMnCo nanoneedle catalyst exhibited a power density slightly lower than that of a commercial Pt/C (40?wt% Pt) catalyst at 60 °C. Thus, the NiMnCo nanoneedle co-catalyst could reduce the dependence of proton exchange membrane fuel cells on Pt catalysts.
E. Padmini.,M. Helen Kalavathy,Miranda Lima Rose 한국탄소학회 2008 Carbon Letters Vol.9 No.2
In the present study Sisal fiber obtained from the leaves of Agave sisalana has been chosen to validate its viability as an adsorbent for the removal of Nickel from aqueous solutions. The material was also surface modified and its effect on adsorption of Nickel was also studied. Agave sisalana fiber was found to be a cheap and effective adsorbent doing away with the need to activate the material therby reducing processing cost. The equilibrium studies indicated that the adsorption capacity of raw fiber and the surface modified fiber was 8.66 and 9.77 mg/g respectively with the Langmuir isotherm describing the adsorption phenomena better than the Freundlich and Temkin isotherm. The adsorption was found to be exothermic from the thermodynamic studies and the kinetics showed that the adsorption phenomena were second order.
E. Padmini.,Singh K. Prakash,Lima Rose Miranda 한국탄소학회 2010 Carbon Letters Vol.11 No.4
The photodegradation of the model compounds Quinol, an aromatic organic compound and Acid blue FFS, an acid dye of chemical class Triphenylmethane was studied by using illumination with UV lamp of light intensity 250W. TiO2 and TiO2 doped with Boron and Nitrogen was used as catalyst. The sol-gel method was followed with titanium isopropoxide as precursor and doping was done using Boron and Nitrogen. In photocatalytic degradation, TiO2 and doped TiO2 dosage, UV illumination time and initial concentration of the compounds were changed and examined in order to determine the optimal experimental conditions. Operational time was optimized for 360 min. The optimum dosage of TiO2 and BN doped TiO2 was obtained to be 2 mgL-1 and 2.5 mgL-1 respectively. Maximum degradation % for quinol and Blue FFS acid dye was 78 and 95 respectively, at the optimum dosage of BN-doped TiO2 catalyst. It was 10 and 4% higher than when undoped TiO2 catalyst was used.
Yuvraj,Padmini Padmanabhan 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.3
This work identifies shortcomings of conventional practices in unstructured modeling of microalgal growth, thereby exploring the possibility of improving simulation of algal cultures. Light- and nitrogen-limited growth of Chlorella vulgaris under CO2-replete conditions was modeled and simulated for a series of operating conditions in stirred-tank photobioreactors of bench scale. Based on the response of alga over a wide range of incident fluxes (50-400 μmol/(m2·s)) and nitrate levels (23-720 mg/L) in bubbled culture tubes, sixteen two-factor multiplicative models were developed by coupling suitable single-factor kinetic models for light and nitrate limited growth. Results suggest that the traditional use of Monod and Andrews kinetics in multi-factor modeling may not always be optimum as growth of the microalga was best described by other common models with a R2 of 0.93. Contrary to common belief, the study has demonstrated that biomass yield on nitrogen is a variable quantity and its reciprocal can be precisely modeled by Logistic/Gompertz function of nitrogen concentration. Common schemes to determine growth rate in attenuated light were also assessed. Local growth rates were found more appropriate than average intensity for estimation of net growth rate in steep light gradients. Simulations have also revealed that dissolved oxygen tension as high as 400% does not possess any threat to microalgal cultures as generally assumed. Model’s predictability for scaled culture in geometrically similar photobioreactor was also examined.
용매 최적화를 통한 페로브스카이트 태양전지의 전하수송층 제어 기술
조성원(Sung-Won Cho),Padmini Pandey,강동원(Dong-Won Kang) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
태양전지의 효율을 증가시키기 위해서 계면에서의 전하수송 특성을 제어하는 것은 매우 중요하다. 우리 팀은 평면 구조의 페롭스카이트 태양전지 개발에 있어서 자주 이용되는 PCBM 소재의 모폴로지 제어를 위해서 유기 용매의 최적 조합에 대해 연구하였다. 실제적으로 클로로벤젠이라는 용매가 주로 많이 사용되고 있는데, 이 용매로 용액 공정을 진행할 경우 표면 모폴로지가 평탄화 공정이 잘 진행되지 않는 경우가 많다. 따라서 본 논문에서는 평탄화 공정의 최적화를 위해서 클로로벤젠에 추가적인 용매 Y2를 추가하여 끓는점과 증기압의 변화를 추구하였다. 그를 통해서 PCBM의 용액 공정 후의 열처리 공정에서 원활한 평탄화 작업을 지을 수 있음을 실험적으로 검증하였다. 이를 통해서, 페롭스카이트 박막 태양전지의 기본 효율이 16% 수준에서 19%에 가까운 변환 효율의 향상을 검증할 수 있었으며, 향후 추가적인 연구를 통해 본 연구분야의 전하수송층 용액 공정에서의 가이드라인을 제공할 수 있을 것으로 기대된다.
Marine Algae and Their Potential Application as Antimicrobial Agents
Grace N.A. Charway,Padmini Yenumula,Young-Mog Kim 한국식품위생안전성학회 2018 한국식품위생안전성학회지 Vol.33 No.3
The world is becoming overwhelmed with widespread diseases as antibiotic resistance increases at an alarming rate. Hence, there is a demanding need for the discovery and development of new antimicrobial drugs. The ocean is gifted with many organisms like phytoplankton, algae, sponges, cnidarians, bryozoans, mollusk, tunicates and echinoderms, which are known to produce a wide variety of bioactive secondary metabolites with pharmacological properties. Many new therapeutic drugs have emerged from marine invertebrates, although the large algal community is yet to be explored. The bioactivity possessing secondary metabolites of marine algae include polyphenols, phlorotannins, alkaloids, halogenated compounds, sulfated polysaccharides, agar, carrageenan, proteoglycans, alginate, laminaran, rhamnan sulfate, galactosylglycerol, and fucoidan. These metabolites have been found to have great antimicrobial activities against many human aliments. Studies show that the algal community represents about 9% of biomedical compounds obtained from the sea. This review looks at the evolution of drugs from the ocean, with a special emphasis on the antimicrobial activities of marine algae.