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M. J. Shivaram,Shashi Bhushan Arya,Jagannath Nayak,Bharat B. Panigrahi 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
In this study, antibacterial Ag element added to synthesis of porous Ti–20Nb–5Ag (wt%) alloy using powder metallurgy spaceholder route. The microstructural, mechanical property, surface bioactivity and cytotoxicity behavior of porous Ti–20Nb–5Ag alloy have been investigated. The developed porous alloy obtained the porosities ranging from 22.5 to 68%. The poroussample having a porosity of about 43% is found to be in the optimum condition, which possess a modulus of about 5.8 GPawith an excellent compressive strength about 205 MPa. XRD result shows that the formation of small amount of α-Ti, β-Ti,along with α ״ martensite and Ti2Agare key phase constituents of sintered porous Ti–20Nb–5Ag alloys. The compressionstrength and elastic modulus of the sintered alloys were showed that decreased with increase of porosity. Surface bioactivityresult revealed that the significant formation of hydroxyapatite on the alkali-heat treated (5 M NaOH) porous Ti–20Nb–5Agalloy which is found after the in vitro test in SBF. Further, the cell viability test was conducted on as-synthesized porousTi–20Nb–5Ag alloy for 1, 4, and 7 days using MG-63 human osteoblast cells and result shows an excellent cell proliferation,and the cytotoxicity test confirms the non-toxic nature of the porous alloy which is very much suitable for implant application.
Bhirud, Ashwini P,Sathaye, Shivaram D,Waichal, Rupali P,Ambekar, Jalindar D,Park, Chan-J,Kale, Bharat B RSC Pub 2015 Nanoscale Vol.7 No.11
<P>Highly monodispersed nitrogen doped TiO2 nanoparticles were successfully deposited on graphene (N-TiO2/Gr) by a facile in-situ wet chemical method for the first time. N-TiO2/Gr has been further used for photocatalytic hydrogen production using a naturally occurring abundant source of energy i.e. solar light. The N-TiO2/Gr nanocomposite composition was optimized by varying the concentrations of dopant nitrogen and graphene (using various concentrations of graphene) for utmost hydrogen production. The structural, optical and morphological aspects of nanocomposites were studied using XRD, UV-DRS, Raman, XPS, FESEM, and TEM. The structural study of the nanocomposite shows existence of anatase N-TiO2. Further, the details of the components present in the composition were confirmed with Raman and XPS. The morphological study shows that very tiny, 7-10 nm sized, N-TiO2 nanoparticles are deposited on the graphene sheet. The optical study reveals a drastic change in absorption edge and consequent total absorption due to nitrogen doping and presence of graphene. Considering the extended absorption edge to the visible region, these nanocomposites were further used as a photocatalyst to transform hazardous H2S waste into eco-friendly hydrogen using solar light. The N-TiO2/Gr nanocomposite with 2% graphene exhibits enhanced photocatalytic stable hydrogen production i.e. 5941 μmol h(-1) under solar light irradiation using just 0.2 gm nanocomposite, which is much higher as compared to P25, undoped TiO2 and TiO2/Gr nanocomposite. The enhancement in the photocatalytic activity is attributed to 'N' doping as well as high specific surface area and charge carrier ability of graphene. The recycling of the photocatalyst shows a good stability of the nanocomposites. This work may provide new insights to design other semiconductor deposited graphene novel nanocomposites as a visible light active photocatalyst.</P>
Humidity Sensing Properties of Nanoporous TiO<sub>2</sub>-SnO<sub>2</sub> Ceramic Sensors
Kim, Hye-Kyung,Sathaye, Shivaram Dattatraya,Hwang, Young-Kyu,Jhung, Sung-Hwa,Hwang, Jin-Soo,Kwon, Soo-Hwan,Park, Sang-Eon,Chang, Jong-San Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.11
Bhirud, Ashwini,Sathaye, Shivaram,Waichal, Rupali,Park, Chan-Jin,Kale, Bharat The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.33
<▼1><P>N–ZnO/GR nanocomposites are synthesized by an <I>in situ</I> wet chemical method which show superior photocatalytic H2 production and high supercapacitive performance.</P></▼1><▼2><P>We have demonstrated a facile <I>in situ</I> wet chemical method to synthesize nanostructured nitrogen doped ZnO/Graphene (N–ZnO/GR) nanocomposites for the first time. Nitrogen doped ZnO over graphene (N–ZnO/GR) was studied using various concentrations of graphene. During the synthesis of N–ZnO/GR nanocomposites, <I>in situ</I> formation of graphene <I>via</I> GO reduction and formation of 4–9 nm N–ZnO have been demonstrated. The composite N–ZnO/GR absorbs in the visible region and this property is used for the photocatalytic reaction to transform hazardous H2S waste into eco-friendly hydrogen using solar light. The N–ZnO/GR nanocomposite with 0.3% graphene exhibits an enhanced photocatalytic stable hydrogen production rate <I>i.e.</I> ∼5072 μmol h<SUP>−1</SUP> under visible light irradiation. It is noteworthy that the N–ZnO/GR electrode exhibits a high specific capacitance of 555 F g<SUP>−1</SUP> and excellent cyclic performance with nearly 96.20% capacity retention after 2000 cycles at a current density of 10 A g<SUP>−1</SUP>. These results indicate great potential applications of N–ZnO/GR in developing high hydrogen production and supercapacitors with high energy and power densities.</P></▼2>
The role of actin cytoskeleton in oscillatory fluid flow-induced signaling in MC3T3-E1 osteoblasts
Malone, A. M. D.,Batra, N. N.,Shivaram, G.,Kwon, R. Y.,You, L.,Kim, C. H.,Rodriguez, J.,Jair, K.,Jacobs, C. R. AMERICAN PHYSIOLOGICAL SOCIETY 2007 American journal of physiology. Cell physiology Vol.292 No.5
JNM : Original Article ; Defecation Frequency and Stool Form in a Coastal Eastern Indian Population
( Manas Kumar Panigrahi ),( Sanjib Kumar Kar ),( Shivaram Prasad Singh ),( Uday C Ghoshal ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2013 Journal of Neurogastroenterology and Motility (JNM Vol.19 No.3
Background/Aims Data on normal stool form and frequency, which are important for defining constipation, are scanty; hence, we studied these in an eastern Indian population. Methods One thousand and two hundred apparently healthy asymptomatic subjects were evaluated for predominant stool form (Bristol chart with descriptor) and frequency. Data on demographic and life-style (diet and physical activity) were collected. Results Of 1,200 subjects (age 42 ± 14.5 years, 711, 59% male), most passed predominantly Bristol type IV stool (699 [58.2%]; other forms were: type I (23 [1.9%]), type II (38 [3.2%]), type III (99 [8.2%]), type V (73 [6%]), type VI (177 [14.7%]), type VII (7 [0.6%]) and an irregular combination (84 [7%]). Weekly stool frequency was 12.1 ± 4.7 (median 14, range 2-42). Less than 3 stools/week was noted in 32/1,200 (2.6%). Female subjects (n = 489) passed stools less frequently than males (n = 711) (11.1 ± 5.6/week vs. 12.8 ± 3.8/week, P< 0.001) and tended to pass harder forms (type I: 17, type II: 20, type III: 39 vs. 6, 18 and 60, respectively, P = 0.061). Vegetarians (n = 252) and physically active (n = 379) subjects tended to pass stool more frequently than occasional (n = 553) and regular non-vegetarian (n = 395) (11.8 ± 4.5 and 12.8 ± 4.7 vs. 11.3 ± 4.7; P < 0.05) and sedentary (n = 464) and intermediately active (n = 357) subjects (13.4 ± 4.0 and 12.3 ± 4.5 vs. 10.9 ± 5.1, P = 0.080) in different age groups, respectively. Older age was associated with less frequent stool, particularly among female population. Female gender and age > 35 years were significant on multivariate analysis. Conclusions Median stool frequency in the studied population was 14/week (range 2-42) and predominant form was Bristol type IV. Older age was associated with lesser stool frequency, particularly among female subjects. (J Neurogastroenterol Motil 2013; 19:374-380)
Photoinduced Superhydrophilicity in TiO2 Thin Films Modified with WO3
장종산,Kashinath Rangu Patil,김혜경,Shivaram Dattatraya Sathaye,황진수,박상언,황영규 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.10
Tungsten oxide-modified TiO2 thin films were formed on a glass substrate by sol-gel and dip coating processes using acetyl acetone as a chelating agent. The hydrophilic properties of the thin films were investigated with illumination of UV light. The dependence of water contact angle on material composition and morphology of the film is established with SEM image and AFM profile. The surface morphology was controlled with the change of precursor concentration. 0.01 M of tungsten oxide-modified TiO2 have shown the highest hydrophilicity after UV-irradiation. The effect of composition on photoinduced hydrophilicity of the WO3-TiO2 films was also investigated. The films were characterized by XRD, SEM, AFM and XPS.
Photoinduced Superhydrophilicity in TiO<sub>2</sub> Thin Films Modified with WO<sub>3</sub>
Hwang, Young-Kyu,Patil, Kashinath Rangu,Kim, Hye-Kyung,Dattatraya Sathaye, Shivaram,Hwang, Jin-Soo,Park, Sang-Eon,Chang, Jong-San Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.10
Tungsten oxide-modified TiO2 thin films were formed on a glass substrate by sol-gel and dip coating processes using acetyl acetone as a chelating agent. The hydrophilic properties of the thin films were investigated with illumination of UV light. The dependence of water contact angle on material composition and morphology of the film is established with SEM image and AFM profile. The surface morphology was controlled with the change of precursor concentration. 0.01 M of tungsten oxide-modified Ti$O_2$ have shown the highest hydrophilicity after UV-irradiation. The effect of composition on photoinduced hydrophilicity of the W$O_3$-Ti$O_2$ films was also investigated. The films were characterized by XRD, SEM, AFM and XPS.