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Patole, S.P.,Alegaonkar, P.S.,Lee, H.C.,Yoo, J.B. Pergamon Press ; Elsevier Science Ltd 2008 Carbon Vol.46 No.14
The optimization of water assisted chemical vapor deposition (WA-CVD) was carried out to synthesize ultra long, vertically aligned, densely packed carbon nanotube (CNT) forests. The effect of various WA-CVD parameters (viz. the flow rate of the reactant gas mixture and its injection temperature, growth kinetics, ramp rate and growth temperature) on the height of the CNTs was studied. A hypothesis for catalytic activity is proposed on the basis of the X-ray photoelectron spectroscopic analysis of the CNT grown substrates and further verified at the optimum condition. The effect of temperature on the growth of the CNTs is studied. The gas flow rate and injection temperature influence the onset of oxidation of the substrates, which in turn affects the CNT growth rate. A growth kinetics study is performed in order to monitor the growth temperature. The role of the onset of oxidation of the iron catalyst in the growth of the CNTs is studied by varying the ramp rate. The precise CNT growth temperature for WA-CVD is determined by growth temperature studies. The optimum condition allows ∼2.2+/-0.002mm long CNTs to be obtained.
Patole, S P,Yu, Seong-Man,Shin, Dong-Wook,Kim, Ha-Jin,Han, In-Taek,Kwon, Kee-Won,Yoo, Ji-Beom Institute of Physics [etc.] 2010 Journal of Physics. D, Applied Physics Vol.43 No.9
<P>The effect of Al-barrier layer-mediated Fe-catalytic deactivation in vertically aligned carbon nanotube (CNT) growth was studied. The substrate surface morphology, catalytic diffusion and barrier layer oxidation were found to be dependent on the annealing temperature of the barrier layer, which ultimately affects CNT growth. The annealed barrier layer without complete oxidation was found to be suitable for top to bottom super aligned CNT arrays. The highest average CNT growth rate of up to 3.88 µm s<SUP>−1</SUP> was observed using this simple approach. Details of the analysis are also presented.</P>
Patole, Shashikant P,Shin, Dong Wook,Fugetsu, Bunshi,Yoo, Ji-Beom American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.11
<P>Transparent conducting films (TCF) made up from carbon nanotubes (CNTs) have a tremendous potential in replacing the indium tin oxide films. Compare to single wall CNTs multiwall CNTs are more metallic and are more suitable candidate for the TCF. In this letter we report the use of selectively grown mm-scale, few-wall, vertically aligned CNTs for the fabrication of TCF. Water-assisted chemical vapor deposition was used to grow the mm-scale CNTs within short growth time. A special post-growth water-vapor treatment allowed us to remove the catalyst-free CNT forest very easily from the substrate and use it for the further process. A filtration-wet transfer process was used to form the TCF. The TCF shows sheet resistance of 228 omega/sq. at 72% transparency (at 550 nm). The ratio of optical conductivity to dc conductivity was observed in between 0.21 to 0.25 for below 80% transmission.</P>
Patole, Archana S.,Patole, S. P.,Yoo, Ji-Beom,Ahn, Jeong-Ho,Kim, Tae-Ho Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of polymer science. Part B, Polymer physic Vol.47 No.15
<P>The higher surface area of selectively grown multiwall carbon nanotubes (MWCNTs) and the better proximity of the reactant species in in situ microemulsion polymerization were used to attach the polystyrene (PS) nanoparticles to the outer wall of MWCNTs. Attachment were achieved by replacing surfactant with PS nanoparticles. SEM showed that the MWCNTs and PS nanoparticles were distributed in the composite. High resolution transmission electron microscopy showed successful anchoring of PS nanoparticles to the outer wall of the MWCNTs. In addition, anchoring enhanced the Raman's G/D ratio of the MWCNT and degradation temperature in PS nanoparticles. A mechanism of attachment of PS nanoparticles on the outer wall of MWCNT was proposed. The modified MWCNTs exhibited good durability and dispersability in different organic solvents. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 1523–1529, 2009</P>
Patole, S.P.,Kim, H.I.,Jung, J.H.,Patole, A.S.,Kim, H.J.,Han, I.T.,Bhoraskar, V.N.,Yoo, J.B. Pergamon Press ; Elsevier Science Ltd 2011 Carbon Vol.49 No.11
Aligned carbon nanotubes (CNTs) were grown on an aluminum foil laminated on a flexible stainless steel (SS) substrate. Lamination was carried out under a pressure of 10MPa with simultaneously heating at 400<SUP>o</SUP>C. The laminated Al foil was spray-coated with an iron chloride catalyst precursor solution and the CNTs were grown using water-assisted chemical vapor deposition at 810<SUP>o</SUP>C. The CNTs grew as vertically aligned forests, approximately 600μm in height, within 600s without crumpling of the Al foil. The Al foil acts as a sacrificial barrier layer to grow the CNTs. The CNTs had 2-30 walls with an inner diameter of 3-8nm. Thermogravimetric and field emission analysis of the CNTs revealed a degradation temperature and turn-on field of 643.5<SUP>o</SUP>C and 0.46V/μm, respectively. Transmission electron microscopy and X-ray photoelectron spectroscopy were used to analyze the Al-SS interface and chemical states. After removing the CNTs, the flexible SS substrate could be cleaned, recoated with Al and reused for CNT growth. Overall, this process is a repeatable and continuous roll-to-roll processable method that can be scaled up for industrial production.
Patterned carbon nanotube growth using an electron beam sensitive direct writable catalyst
Patole, S P,Patole, A S,Rhen, D S,Shahid, M,Min, Hyosun,Kang, Dae Joon,Kim, Tae-Ho,Yoo, Ji-Beom IOP Pub 2009 Nanotechnology Vol.20 No.31
<P>This paper reports the use of spin coatable Fe naphthenate (Fe(C<SUB>11</SUB>H<SUB>7</SUB>O<SUB>2</SUB>)<SUB>2</SUB>) as an electron beam sensitive direct writable catalyst suitable for growing high quality carbon nanotubes (CNTs). Vertically aligned, densely packed, equal in height, three- to four-walled and 5–7 nm inner diameter CNTs were grown on the nanoscale stripe patterns by water-assisted chemical vapor deposition. The correlation between electron beam dosage and the growth characteristics of CNTs is also discussed.</P>
In situ 미니에멀젼중합에 의한 실리카/폴리스타이렌 복합체 나노입자의 합성과 특성
( Archana S. Patole ),( S. P. Patole ),송미향 ( Mi Hyang Song ),윤주영 ( Joo Young Yoon ),김진환 ( Jin Hwan Kim ),김태호 ( Tae Ho Kim ) 한국고무학회 2009 엘라스토머 및 콤포지트 Vol.44 No.1
In situ 미니에멀젼 중합으로 실리카/폴리스타이렌 하이브리드 나노복합체를 만들기 위하여 9-데세노 산을 실리카 표면 개질제로 처음 도입하였다. 복합체는 나노크기의 잘 분산된 실리카를 함유하고 있었다. 실리카의 표면 개질 및 폴리스타이렌의 합성 등은 FTIR로 확인하였고 생성 라텍스 중에 존재하는 실리카의 양은 TGA 분석으로 확인하였다. 생성된 하이브리드는 실리카의 양 증가에 따라 유리전이온도가 상승하였다. SEM과 TEM으로 확인한 결과 하이브리드 복합체는 평균 직경이 55 nm 정도로 나타났다. 복합체내의 실리카의 존재는 EDS와 연결된 TEM 등으로 확인되었다. New coupling agent or surface modified agent (9-decenoic acid) was used to enhance the compatibility between silica and polystyrene in silica/polystyrene hybrid nanocomposite, synthesized by in situ miniemulsion polymerization. Composites contain well dispersed nanosize silica particles. Related tests and analyses confirmed the success of synthesis. Functionalization of silica by 9-decenoic acid and silica on the polystyrene was confirmed by FTIR. TGA showed presence and amount of silica in final latex. The glass transition temperature of the hybrid nanocomposite was increased with the silica amount. SEM and TEM analysis showed the spherical morphology of PS and composite with an average diameter of 55 nm. The presence of silica within composite was confirmed by EDS attached to the existing TEM.
Synthesis and Characterization of a Novel Laser Ablation Sensitive Triazene Incorporated Epoxy Resin
Archana S. Patole,Jeong-min Hyeon,Jung-Mn Hyun,김태호,Shashikant P. Patole,Dae-Jo Hong,Chang-Bo Lee,Cheol-Ho Choi 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
New triazene monomer was synthesized and further employed as a crosslinking agent partner with epoxy matrix using ethyl methyl imidazole as a curing agent in order to investigate the effect of triazene moieties on polymeric properties for laser ablation application. The synthesized triazene monomer was characterized by analytical and spectroscopic methods, while the surface morphology of resist after laser ablation was visualized by optical laser scanning images and scanning electron microscopy. Thermogravimetrical investigations indicate the loss of nitrogen being the initial thermal decomposition step and exhibit sufficient stabilities for the requirements for laser ablation application. Fourier transform infra-red, nuclear magnetic resonance, and gas chromatography analyses showed the successful synthesis of triazene. The ablation results from the optical laser scanning images revealed that the etching depth could be controlled by varying the concentration of triazene monomer in the formulation of epoxy. The shear strength analysis revealed that that the shear strength increased with increasing the amount of triazene in the formulation of direct ablation sensitive resist.
Vinita C. Patole,Ashlesha P. Pandit 한국약제학회 2018 Journal of Pharmaceutical Investigation Vol.48 No.3
An attempt was made to formulate mesalamineloaded alginate microspheres by emulsion cross linking method for local treatment of ulcerative colitis. Microspheres were filled in HPMC capsules enteric coated with Eudragit FS-30D. The effect of process variables like drug-alginate concentration ratio and emulsifier concentration was optimized. Microspheres were evaluated for particle size, shape and entrapment efficiency. Spherical shaped microspheres were confirmed by scanning electron microscopy. In vitro drug release study showed a burst drug release pattern in the initial hour necessitating encapsulation of alginate microspheres. In vivo study in rats performed by colonic inflammatory lesions demonstrated remarkable reduction in ulcer index treated with microspheres. Histopathological study confirmed no signs of ulceration or bleeding. Microspheres (drug:alginate concentration, 1:1) was then filled in HPMC capsule shells, enteric coated with Eudragit FS 30D to gain 30 mg weight. Due to solubility of Eudragit FS30D above pH 7, an encapsulated system released alginate microspheres at colon region. Capsules with weight gain of 30 mg coating polymer (B3) resisted the drug release at intestinal region for about 6 h with 10% drug release. In vitro drug release of formulation B3 showed 64.89 and 90.52% drug release within 10 h, in phosphate buffer pH 7.4 and in presence of rat faecal content in simulated colonic fluid, respectively. The later rapid drug release was due to action of colonic microflora at alginate microspheres. Therefore, mesalamine-loaded alginate microspheres enteric coated in HPMC capsules can be potential delivery system for local treatment of ulcerative colitis.
Swapnil Singh THAKUR(Swapnil Singh THAKUR ),Rahul Singh GAUTAM(Rahul Singh GAUTAM ),Ajay Kumar YADAV(Ajay Kumar YADAV ),Hitesh PATOLE(Hitesh PATOLE ),Aashi RAWAL(Aashi RAWAL ),Shailesh RASTOGI(Shailes 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.2
The goal of this study is to understand how financial inclusion (FI) as influenced by Internet subscribers in India, affects India’s Sustainable Development Goals (SDG). This study makes use of secondary data that was collected from 16 Indian states and one Union Territory between the fiscal years of 2018 and 2020. The goal of this study has been investigated using panel data regression analysis (PDR). And the study’s findings indicate that wages received through MNREGA accounts and post office operating accounts under the supervision of Internet subscribers have a significant negative impact on India’s SDGs, demonstrating how financial inclusion is harming the country’s efforts to achieve sustainable development. This study suggests that it is important to pay attention to rural areas’ access to the digital environment and their degree of digital literacy. These findings imply that improving the MGNREGA program and employees’ pay might help the government alleviate poverty in India. Financial inclusion also depends heavily on financial literacy. The government should improve its digital infrastructure in rural and urban areas so that people there may better understand and utilize it given that it promotes financial inclusion, digitalization, economic advancement, rural development, and poverty reduction.