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Hydrothermal Synthesis of H2V3O8 Nanobelts from V2O5 Xerogels for Lithium Battery Applications
Sun-Il Mho,Ch.V. Reddy,Youna Kim,In-Hyeong Yeo,Su-Moon Park 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6
Vanadium oxyhydroxide (H2V3O8) nanobelts were synthesized from V2O5 xerogels through a simple hydrothermal process in efforts to obtain nanomaterials for rechargeable Li batteries. Polymers with multidentate oxygen ligands, such as polyethylene glycol or polyethylene oxide, were shown to play a critical role in the formation of H2V3O8 nanobelts during the hydrothermal process. The specific capacity measured during the initial discharge process for the lithium battery with a cathode made of H2V3O8 nanobelts were 292 mAh/g, which stabilized at ca. 261 mAh/g corresponding to two equivalents of Li intercalation/deintercalation into H2V3O8. Lithium batteries made of a vanadium-oxyhydroxide cathode showed better cycle stability than those with a V2O5 cathode.
Reddy, Ch.V.,Babu, B.,Vattikuti, S.V.P.,Ravikumar, R.V.S.S.N.,Shim, J. Elsevier [etc.] 2016 Journal of luminescence Vol.179 No.-
Vanadium (0.01, 0.03 and 0.05mol%) doped SnO<SUB>2</SUB> nanoparticles have been synthesized using combustion synthesis method. The as-prepared nanoparticles were characterized using various measurements such as XRD, SEM with EDS, HRTEM, Raman spectroscopy, optical, PL, XPS and FT-IR techniques. The crystal structure and average particle sizes of the prepared nanoparticles were confirmed from the XRD. The average crystalline particle sizes were decreased by increasing the vanadium dopant concentration. The presence of vanadium as V<SUP>4+</SUP> species in the host lattice was confirmed by X-ray photoelectron spectroscopy. The band gap energies were decreased by increasing dopant concentration. The 0.05mol% doped sample showed higher photocatalytic activity than undoped, V-1 and V-3 in decomposing rhodamine B (RhB) under UV light irradiation. The Raman and IR spectra confirm the fundamental vibration of SnO<SUB>2</SUB> host molecules.
Synthesis of VO2 (B) nanorods for Li battery application
Ch.V. Subba Reddy,Edwin H. Walker Jr.,S.A. Wicker Sr.,Quinton L. Williams,Rajamohan R. Kalluru 한국물리학회 2009 Current Applied Physics Vol.9 No.6
Vanadium dioxide nanorods were synthesized through a hydrothermal reaction from V2O5 xerogel, poly (vinyl pyrrolidone) (PVP) and lithium perchlorate (LiClO4). The prepared samples were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical discharge–charge cycling in lithium battery. SEM images reveal the nanorods to have dimensions on the order of 1–3 ㎛ in length and 10–50 nm in diameter. The measured initial discharge capacity of the lithium battery with a cathode made of VO2 (B) nanorods was 152 mA h/g. Vanadium dioxide nanorods were synthesized through a hydrothermal reaction from V2O5 xerogel, poly (vinyl pyrrolidone) (PVP) and lithium perchlorate (LiClO4). The prepared samples were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical discharge–charge cycling in lithium battery. SEM images reveal the nanorods to have dimensions on the order of 1–3 ㎛ in length and 10–50 nm in diameter. The measured initial discharge capacity of the lithium battery with a cathode made of VO2 (B) nanorods was 152 mA h/g.
Alok Sharma,G.D. Reddy,Atul Kaushik,K.Shanker,R.K. Tiwari,Alok Mukherjee,Ch.V. Rao 한국생약학회 2007 Natural Product Sciences Vol.13 No.1
ethanolic (50% v/v) extracts of Carissa carandas (fruits) (Apocynaceae) and Microstylis wallichii(tubers) (Orchidaceae) were examined for anti-inflamatory and analgesic activities in experimental animals.Carissa carandas and Microstylis wallichii (50 - 200 mg/kg) caused a dose dependent inhibition of swellingcaused by carrageenin significantly in cotton pellet induced granuloma in rats (P < 0.05 to P < 0.001). There was asignificant increase in the analgesy meter induced pain in rats. The extracts of Carissa carandas and Microstyliswallichii resulted in an inhibition of stretching episodes and percentage protection was 16.05 - 17.58%respectively in acetic acid induced writhing.KeywordsCarissa carandas, Microstylis wallichii, pain, inflamation
Extranodal NK/T-Cell Lymphoma, Nasal Type, Extranasal and Ulcerative Blister Variant, Case Report
Yadira Noemí Chávez Dávila,Víctor Hugo Pinos León,Sonia Tello Astudillo,Grace Margreth Loza Erazo,Jennyfer Daniela Granizo Rubio 대한피부과학회 2023 Annals of Dermatology Vol.35 No.-
The extranodal natural killer (NK) T-cell lymphoma of nasal type is a form of lymphoma that falls within the WHO/EORTC 2018 classification of cutaneous T-cell lymphomas. It is characterized for being aggressive, infrequent, and destroying midline facial structures; however, it can also be in primary or secondary form at extranasal sites, such as the skin or the gastrointestinal tract, among others. We report the case of an 18-year-old patient with an extranodal NK/T-cell lymphoma located in an extranasal site. The clinical presenta- tion is characterized for being multifocal and with erythematous-violaceous plaques that progress to hemorrhagic blisters and necrotic ulcers. Although this type of lymphoma has been reported previously by others, the presence of blisters is an atypical finding, which we believe has been described only in one case in the medical literature.
Extranodal NK/T-Cell Lymphoma, Nasal Type, Extranasal and Ulcerative Blister Variant, Case Report
( Yadira Noemí Chávez Dávila ),( Víctor Hugo Pinos León ),( Sonia Tello Astudillo ),( Grace Margreth Loza Erazo ),( Jennyfer Daniela Granizo Rubio ) 대한피부과학회 2023 Annals of Dermatology Vol.35 No.7
The extranodal natural killer (NK) T-cell lymphoma of nasal type is a form of lymphoma that falls within the WHO/EORTC 2018 classification of cutaneous T-cell lymphomas. It is characterized for being aggressive, infrequent, and destroying midline facial structures; however, it can also be in primary or secondary form at extranasal sites, such as the skin or the gastrointestinal tract, among others. We report the case of an 18-year-old patient with an extranodal NK/T-cell lymphoma located in an extranasal site. The clinical presentation is characterized for being multifocal and with erythematous-violaceous plaques that progress to hemorrhagic blisters and necrotic ulcers. Although this type of lymphoma has been reported previously by others, the presence of blisters is an atypical finding, which we believe has been described only in one case in the medical literature.
Luis Alfonso Castillejo Adalid,Víctor Chávez Herrera,Diego Soto Rubio,Miguel Abdo Toro,Eric Estrada Estrada 대한뇌혈관외과학회 2022 Journal of Cerebrovascular and Endovascular Neuros Vol.24 No.4
Development of Internal Carotid Artery pseudoaneurysms (ICAp) after transsphenoidal surgery is extremely rare, occurring only in 0.4% of cases. Surgical treatment of ICAp poses a real challenge to the neurosurgeon as treatment may require parent vessel sacrifice or artery reconstruction with bypass grafting. Furthermore, surgical resolution of these lesions is rarely reported in the literature. The internal carotid artery is prone to iatrogenic injury in transsphenoidal surgery due to its frequent involvement in pituitary adenomas. Intracranial pseudoaneurysms may be at high risk for rupture and increased morbidity and mortality. Here we present a case of a patient with an ICAp rupture two months after transsphenoidal surgery for a pituitary adenoma.
Improvement of Mechanical Properties of Pineapple Leaf Fibers by Mercerization Process
Natalia Jaramillo-Quiceno,J. Manuel Vélez R.,Edith M. Cadena Ch.,Adriana Restrepo-Osorio,J. Felipe Santa 한국섬유공학회 2018 Fibers and polymers Vol.19 No.12
Pineapple leaf fibers (PALF) were modified by the mercerization process to improve their mechanical properties for applications in composites. The changes in the morphology and mechanical properties of fibers were evaluated after using different conditions (temperature and sodium hydroxide concentration) for the mercerization process. The study was done using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Mercerization treatments caused a reduction in the diameter of fibers, either due removal of surface impurities, disintegration of middle lamella and/or interfibrillar swelling. Mechanical properties of mercerized fibers were modified. The highest tensile strength was observed when mercerization was done at a temperature of 60 oC and alkali concentration of 3 % wt.