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Sekhon, Satpal Singh,Park, Jin-Soo,Choi, Young-Woo Royal Society of Chemistry 2010 Physical Chemistry Chemical Physics Vol.12 No.41
<P>Small-angle X-ray scattering (SAXS) technique has been used to study the evolution of ionomer peak in the recast Nafion membranes containing the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF<SUB>4</SUB>). To the best of our knowledge, this is the first report dealing with the study of membranes containing different concentrations of the ionic liquid (EMIBF<SUB>4</SUB>), from the dry (no ionic liquid) to the saturation (containing 70 wt% ionic liquid) state to understand the evolution of the ionomer peak and the formation of ionic aggregates in these anhydrous membranes. The small-angle scattering maximum (ionomer peak) has been observed to shift continuously toward lower scattering vector (<I>q</I>) values as the ionic liquid content increases. The ionic conductivity behavior for the membranes containing ionic liquid has been found to be closely related with the change of slope of the double logarithmic plot between the reciprocal of the position of the ionomer peak and the polymer weight fraction. The <I>q</I> region over which Porod's law has been obeyed in different membranes was initially narrow and has been observed to widen with an increase in the content of the ionic liquid.</P> <P>Graphic Abstract</P><P>Ionomer peak shifts to lower scattering vector values with an increase in ionic liquid content in anhydrous fuel cell membranes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp00966k'> </P>
고온/저가습 고분자전해질 연료전지를 위한 이온성 액체 기반 고분자 전해질막 개발
새트팔 싱 세콘(Satpal Singh Sekhon),박진수(Jin-Soo Park),조은경(EunKyung Cho),박구곤(Gu-Gon Park),김창수(Chang-Soo Kim),이원용(Won-Yong Lee) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
High temperature polymer electrolyte membranes incorporating ionic liquids (ILs) in different polymers such as commercial fluorinated polymers, sulfonated polymers and recasted nafion have been developed. ILs based on imidazolium cation and different anions possess high ionic conductivity and good thermal stability and have been used in the present study. The membranes containing IL show conductivity ~10-2 S cm-1 above 100oC under anhydrous conditions and are thermally stable up to 250-300 oC. IL acts as a conducting medium in these electrolytes and plays the same role as played by water in fully hydrated nafion membranes. Due to high conductivity and good thermal stability, these membranes are promising materials for PEFCs at higher temperatures under anhydrous conditions.
Bioengineered aptamer-nanoconjugates for cancer theragnosis
SEKHONSIMRANJEET SINGH,안근아,Satpal Singh Sekhon,Ji-Young Ahn,Yang-Hoon Kim 대한독성 유전단백체 학회 2018 Molecular & cellular toxicology Vol.14 No.4
Early detection and treatment of cancer is of global interest as cancer is one of the leading causes of death worldwide. As the survival rate of cancer patients is closely related to its detection at an early stage, there is an urgent need to develop detection techniques that are fast, reliable, and easily available. Aptamers are single stranded DNA- and RNA- based oligonucleotides that can bind to their targets with high affinity and specificity. Their small size, excellent chemical stability, and low immunogenicity enable them to become alternatives to antibodies in cancer theragnostic approaches with cancer imaging and therapy applications. Purpose of review: In this review, we discuss the role of aptamer-nanomaterials conjugates as novel molecular tools for enhanced diagnosis (biosensing and nano-imaging) and therapy (drug delivery) of cancer cells.
Prabhsharan Kaur,김다은,Gaurav Verma,박진수,Satpal Singh Sekhon 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-
The surface modification of carbon nanomaterials with heteroatoms improves their electrocatalyticactivity for oxygen reduction reaction (ORR). The present work reports the surface modification ofcarbon nanofiber (CNF) with poly(diallyldimethylammonium) chloride (PDDA) and Triton X-100. PDDAbehaves as an electron-acceptor, and the intermolecular charge transfer from CNF to PDDA createsdelocalized positive charge sites at the edge and basal plane sites of CNF. Triton X-100 disperses CNF,but also acts as a masking agent to obstruct the intermolecular charge transfer between CNF and PDDA. The surface modification of CNF with (PDDA + Triton X-100) is characterized in terms of FESEM, TEM,EDX, Raman, FTIR and TGA. The electrocatalytic activity of the conjugated systems (CNF + PDDA andCNF + Triton X-100+PDDA) is investigated in terms of cyclic voltammetry and linear sweepvoltammetry. The reduction of oxygen at PDDA-CNF occurs via a more efficient four-electron(n = 3.9) pathway in 0.1 M KOH and exhibits a limiting diffusion current density of 3.23 mA cm 2, whichis closer to the Pt/C electrode (3.41 mA cm 2). PDDA-CNF even outperforms PDDA-CNT or graphene forthe ORR performance owing to their special morphological features. This study thus provides a facileand viable strategy for the scalable production of CNF based ORR electrocatalysts.
Tae-Yeon Cho,Kwan-Woo Ko,윤순길,Satpal Singh Sekhon,강만구,Young-Sik Hong,한치환 한국물리학회 2013 Current Applied Physics Vol.13 No.7
We investigated the effect of a Nb2O5 blocking layer formed through the solegel method introduced to a titanium metal foil electrode in a flexible dye sensitized solar cell. The blocking layer formed directly on the working electrode physically separates the working electrode from the electrolyte, and prevents back transfer of electrons from the electrode to the electrolyte. The gel processing conditions (sol reaction time) and heat treatment temperature used in formation of the Nb2O5 blocking layer have been shown to affect the performance of the dye sensitized solar cell and optimal values of these parameters have been determined. A sol reaction time of 45 min and heat treatment temperature of 550 ℃ has been observed to result in optimal cell performance (h = 6.185%, Jsc = 13.233 mA/cm2, Voc = 0.672 V, ff = 0.694). Introduction of an Nb2O5 blocking layer enhances solar cell efficiency by 39.7%, which is much greater than the increase of 24.6% observed in a similar cell containing a TiO2 blocking layer under standard illumination conditions. The results obtained via Nb2O5 have been observed to be superior to those obtained via a TiO2 blocking layer.
Kaur, Prabhsharan,Shin, Mun-Sik,Park, Jin-Soo,Verma, Gaurav,Sekhon, Satpal Singh Pergamon Press 2018 International journal of hydrogen energy Vol.43 No.13
<P><B>Abstract</B></P> <P>Carbon nanofibers (CNF) exhibit special morphological features pertaining to their high aspect ratio. This work explores the polyelectrolyte (PDDA, Poly (diallyl dimethylammonium) chloride) wrapping on CNF and the interaction mechanism between them in the presence of a surfactant (octyl-phenol-ethoxylate (Triton X-100)). The wrapping has been achieved via a simple on/off ultrasonication methodology. PDDA behaves as a dispersing agent and an electron acceptor; the inter-molecular charge transfer takes place between CNF (electron donor) and PDDA, Triton X-100 works as a dispersing agent too but it affects pronouncedly the inter-molecular charge transfer. It has been observed that π–π, hydrophobic-hydrophilic, weak electrostatic, and van der Waals interactions all sum up to supramolecular interactions in CNF + PDDA + Triton X-100; leading to an augmented N content as compared to carbon nanotubes or graphene in a similar system. This system could work as the metal-free electrocatalyst for the oxygen reduction reaction in a Fuel cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon Nanofibers (CNF) have been modified with Poly (diallyl dimethylammonium) chloride (PDDA) and Triton X-100. </LI> <LI> Supramolecular interactions in CNF+PDDA lead to an enhanced inter-molecular charge transfer. </LI> <LI> Triton X-100 masks the hybrid system to decrease inter-molecular charge transfer in CNF+PDDA+Triton X-100. </LI> <LI> Higher N content (pyridinic and pyrrolic-N) indicates suitability as metal-free electrocatalysts for the Fuel cells. </LI> </UL> </P>