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Improved photoelectrical performance of single crystalline rutile TiO2 nanorod arrays incorporating α-alumina for high efficiency dye-sensitized solar cells

Sriharan, N.,Ganesan, N.M.,Kang, Misook,Kungumadevi, L.,Senthil, T.S. North-Holland 2019 Materials letters Vol.237 No.-
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Abstract Novel architecture like TiO2 nanorod arrays (TNR) incorporating α-alumina (ATNR) thin film have been fabricated on the fluorine-doped tin oxide (FTO) by a modest and flexible doctor-blade technique based hydrothermal method. α-Al2O3, TNR and ATNR were used as a photoanode in dye-sensitized solar cells (DSSCs) and their photovoltaic performance was evaluated. The crystallinity, presence of α-Al2O3 on TNR and morphology of the photoanodes were characterized by X-ray diffraction, field emission scanning microscopy and high-resolution transmission scanning microscopy. DSSCs fabricated with 1.0 wt% α-Al2O3 added TNR exhibited an improved open-circuit photo voltage of 0.68 V, short-circuit current density of 15.23 mA cm−2, fill factor of 0.63 and photo-electric conversion efficiency (PCE) of 6.5%. Highlights <UL> <LI> Novel architecture titanium dioxide nanorod arrays incorporated alpha alumina. </LI> <LI> Synthesized samples were used as a photoanode in dye-sensitized solar cells. </LI> <LI> Presence of nanorod arrays in alumina has been confirmed by electron microscopies. </LI> <LI> Short-circuit current increases with alumina nanocrystals on titania nanorod arrays. </LI> <LI> Photo-electric conversion efficiency of the device reached 6.5%. </LI> </UL> Graphical abstract [DISPLAY OMISSION]
2
Mirizzi’s syndrome

Ashok Kumar,Ganesan Senthil,Anand Prakash,Anu Behari,Rajneesh Kumar Singh,Vinay Kumar Kapoor,Rajan Saxena 한국간담췌외과학회 2016 한국간담췌외과학회지 Vol.20 No.1
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Backgrounds/Aims: Mirizzi’s syndrome (MS) poses great diagnostic and management challenge to the treating physician. We presented our experience of MS cases with respect to clinical presentation, diagnostic difficulties, surgical procedures and outcome. Methods: Prospectively maintained data of all surgically treated MS patients were analyzed. Results: A total of 169 MS patients were surgically managed between 1989 and 2011. Presenting symptoms were jaundice (84%), pain (75%) and cholangitis (56%). Median symptom duration s was 8 months (range, <1 to 240 months). Preoperative diagnosis was possible only in 32% (54/169) of patients based on imaging study. Csendes Type II was the most common diagnosis (57%). Fistulization to the surrounding organs (bilio-enteric fistulization) were found in 14% of patients (24/169) during surgery. Gall bladder histopathology revealed xanthogranulomatous cholecystitis in 33% of patients (55/169). No significant difference in perioperative morbidity was found between choledochoplasty (use of gallbladder patch) (15/89, 17%) and bilio-enteric anastomosis (4/28, 14%) (p=0.748). Bile leak was more common with choledochoplasty (5/89, 5.6%) than bilio-enteric anastomosis (1/28, 3.5%), without statistical significance (p=0.669). Conclusions: Preoperative diagnosis of MS was possible in only one-third of patients in our series. Significant number of patients had associated fistulae to the surrounding organs, making the surgical procedure more complicated. Awareness of this entity is important for intraoperative diagnosis and consequently, for optimal surgical strategy and good outcome.