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- 검색키워드
- 저자 : Tiwari, Sneha (검색결과 470 건)
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Tiwari, Jitendra N.,Kemp, Kingsley Christian,Nath, Krishna,Tiwari, Rajanish N.,Nam, Hong-Gil,Kim, Kwang S. American Chemical Society 2013 ACS NANO Vol.7 No.10
<P>Controlling the morphology and size of platinum nanodendrites (PtDs) is a key factor in improving their catalytic activity and stability. Here, we report the synthesis of PtDs on genomic-double-stranded-DNA/reduced-graphene-oxide (gdsDNA/rGO) by the NaBH<SUB>4</SUB> reduction of H<SUB>2</SUB>PtCl<SUB>6</SUB> in the presence of plant gdsDNA. Compared to industrially adopted catalysts (<I>i.e.</I>, state-of-the-art Pt/C catalyst, Pt/rGO, Pt<SUB>3</SUB>Co, <I>etc.</I>), the as-synthesized PtDs/gdsDNA/rGO hybrid displays very high oxygen reduction reaction (ORR) catalytic activities (much higher than the 2015 U.S. Department of Energy (DOE) target values), which are the rate-determining steps in electrochemical energy devices, in terms of onset-potential, half-wave potential, specific-activity, mass-activity, stability, and durability. Moreover, the hybrid exhibits a highly stable mass activity for the ORR over a wide pH range of 1–13. These exceptional properties would make the hybrid applicable in next-generation electrochemical energy devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-10/nn4038404/production/images/medium/nn-2013-038404_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn4038404'>ACS Electronic Supporting Info</A></P>
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Tiwari, Alka,Shukla, Alok,Tiwari, Diwakar,Choi, Suk Soon,Shin, Hyun-Gon,Lee, Seung-Mok The Korean Society of Industrial and Engineering C 2019 공업화학 Vol.30 No.3
The aim of this review article is to summarize the role of titanium oxide ($TiO_2$) nanomaterials in the remediation of the aquatic environment contaminated with various emerging pollutants. The advanced oxidation process led by the semiconductor $TiO_2$ is an impetus in the remediation technology. Therefore, a vast number of literature works are available in this area. Further, the role of modified $TiO_2$ or thin film materials were discussed in the review. Also, the Localized Surface Plasmon Resonance (LSPR) effect of using noble metaldoped $TiO_2$ played an interesting role in the remediation process.
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( Alka Tiwari ),( Alok Shukla ),( Diwakar Tiwari ),( Suk Soon Choi ),( Hyun-gon Shin ),( Seung-mok Lee ) 한국공업화학회 2019 공업화학 Vol.30 No.3
The aim of this review article is to summarize the role of titanium oxide (TiO<sub>2</sub>) nanomaterials in the remediation of the aquatic environment contaminated with various emerging pollutants. The advanced oxidation process led by the semiconductor TiO<sub>2</sub> is an impetus in the remediation technology. Therefore, a vast number of literature works are available in this area. Further, the role of modified TiO<sub>2</sub> or thin film materials were discussed in the review. Also, the Localized Surface Plasmon Resonance (LSPR) effect of using noble metaldoped TiO<sub>2</sub> played an interesting role in the remediation process.
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Alka Tiwari,Alok Shukla,Lalliansanga,Diwakar Tiwari,이승목 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
Novel meso-porous nanoparticles Au/TiO2 thin films were obtained by template synthesis using polyethylene glycol as filler medium. The materials were characterized by advanced analytical methods. The photocatalysts were employed for the photocatalytic degradation of tetracycline from aqueous solutions using UV-A light (λmax 330 nm). Various physico-chemical parametric studies enabled to deduce the mechanism of degradation. A significant percentage of tetracycline was mineralized by the treatment. The stability of thin film was evidenced with the repeated use of thin film. The degradation of tetracycline was proceeded predominantly by the OH radicals generated at the valance and conduction band of semiconductor.
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Accelerated Bone Regeneration by Two-Photon Photoactivated Carbon Nitride Nanosheets
Tiwari, Jitendra N.,Seo, Young-Kyo,Yoon, Taeseung,Lee, Wang Geun,Cho, Woo Jong,Yousuf, Muhammad,Harzandi, Ahmad M.,Kang, Du-Seok,Kim, Kwang-Youn,Suh, Pann-Ghill,Kim, Kwang S. American Chemical Society 2017 ACS NANO Vol.11 No.1
<P>Human bone marrow-derived mesenchymal stem cells (hBMSCs) present promising opportunities for therapeutic medicine. Carbon derivatives showed only marginal enhancement in stem cell differentiation toward bone formation. Here we report that red-light absorbing carbon nitride (C3N4) sheets lead to remarkable proliferation and osteogenic differentiation by runt-related transcription factor 2 (Runx2) activation, a key transcription factor associated with osteoblast differentiation. Accordingly, highly effective hBMSCs-driven mice bone regeneration under red light is achieved (91% recovery after 4 weeks compared to 36% recovery in the standard control group in phosphate-buffered saline without red light). This fast bone regeneration is attributed to the deep penetration strength of red light into cellular membranes via tissue and the resulting efficient cell stimulation by enhanced photocurrent upon two-photon excitation of C3N4 sheets near cells. Given that the photoinduced charge transfer can increase cytosolic Ca2+ accumulation, this increase would promote nucleotide synthesis and cellular proliferation/differentiation. The cell stimulation enhances hBMSC differentiation toward bone formation, demonstrating the therapeutic potential of near-infrared two-photon absorption of C3N4 sheets in bone regeneration and fracture healing.</P>
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Engineered Carbon-Nanomaterial-Based Electrochemical Sensors for Biomolecules
Tiwari, Jitendra N.,Vij, Varun,Kemp, K. Christian,Kim, Kwang S. American Chemical Society 2016 ACS NANO Vol.10 No.1
<P>The study of electrochemical behavior of bioactive molecules has become one of the most rapidly developing scientific fields. Biotechnology and biomedical engineering fields have a vested interest in constructing more precise and accurate voltammetric/amperometric biosensors. One rapidly growing area of biosensor design involves incorporation of carbon-based nanomaterials in working electrodes, such as one-dimensional carbon nanotubes, two-dimensional graphene, and graphene oxide. In this review article, we give a brief overview describing the voltammetric techniques and how these techniques are applied in biosensing, as well as the details surrounding important biosensing concepts of sensitivity and limits of detection. Building on these important concepts, we show how the sensitivity and limit of detection can be tuned by including carbon-based nanomaterials in the fabrication of biosensors. The sensing of biomolecules including glucose, dopamine, proteins, enzymes, uric acid, DNA, RNA, and 11202 traditionally employs enzymes in detection; however, these enzymes denature easily, and as such, enzymeless methods are highly desired. Here we draw an important distinction between enzymeless and enzyme-containing carbon-nanomaterial-based biosensors. The review ends with an outlook of future concepts that can be employed in biosensor fabrication, as well as limitations of already proposed materials and how such sensing can be enhanced. As such, this review can act as a roadmap to guide researchers toward concepts that can be employed in the design of next generation biosensors, while also highlighting the current advancements in the field.</P>
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Tiwari, N.,Singh, S.B.,Ram, M. The Korean Reliability Society 2010 International Journal of Reliability and Applicati Vol.11 No.2
This paper deals with the reliability analysis of a complex system, which consists of two subsystems A and B connected in series. Subsystem A has only one unit and B has two units $B_1$ and $B_2$. Marked process has been applied to model the complex system. Present reliability model incorporated two repairmen: supervisor and novice to repair the failed units. Supervisor is always there and the novice remains in vacation and is called for repair as per demand. The repair rates for supervisor and novice follow general and exponential distributions respectively and the failure time for both the subsystems follows exponential distribution. The model is analyzed under "Head of line repair discipline". By employing supplementary variable technique, Laplace transformation and Gumbel-Hougaard family of copula various transition state probabilities, reliability, availability and cost analysis have been obtained along with the steady state behaviour of the system. At the end some special cases of the system have been taken.
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Tiwari, Vimal K.,Song, Hyeonjun,Oh, Yeonjae,Jeong, Youngjin Elsevier 2020 ENERGY Vol.195 No.-
<P><B>Abstract</B></P> <P>The composite cathode of sulfur-rich polymer and long cylindrical porous multiwalled carbon nanotubes (LCNT) is reported for high performance lithium-sulfur (Li–S) batteries through combining both chemical and physical binding strategies of sulfur, respectively. This technique efficiently exploits the synergistic effect of ability of stabilizing the polymeric sulfur. The role of uniform distribution of highly conductive LCNT network is optimized as a cathode host material by solution route. Annealed sulfur-co-polymer (S-co-poly) composites are homogeneously well attached via physisorption with LCNT submicron channel. The composite shows a high discharge capacity of 1040 mAh g<SUP>−1</SUP> in the 1st cycle of galvanostatic charge-discharge at 0.5C. Whereas, the cell maintains a reversible capacity of 610 mAh g<SUP>−1</SUP> after 200 cycles, showing good capacity rate. Therefore, solvent assisted both synthesis and further proper mixing enables high active material utilization whereas porous submicron channel of CNT network, which provides conducting pathway, adsorbs sulfur copolymer homogeneously for better electrochemical performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> S-co-poly-LCNT composite cathode was fabricated by inverse vulcanization through solution route. </LI> <LI> High discharge capacity and stable cyclability were achieved by combining chemical and physical binding strategies. </LI> <LI> S-co-poly-LCNT composite is a promising cathode material for high performance Li–S battery. </LI> </UL> </P>
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Tiwari, Ram Vinod,Megalamanegowdru, Jayachandra,Gupta, Anjali,Agrawal, Ankush,Parakh, Abhinav,Pagaria, Sulabh,Sahu, Abhishek Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.23
Background: Tobacco is a leading preventable cause of deaths worldwide; the situation is particularly serious in the developing countries. Tobacco use amongst the children and adolescents is already a pandemic and they are vulnerable targets of tobacco industry. This is also the case in India. Objectives: 1) Document and monitor the prevalence of tobacco use including smoked, smokeless and other forms of tobacco; 2) Understand student knowledge and attitudes related to tobacco use and its health impact; 3) Assess the impact of tobacco on the oral health status of school-going children in India. Materials and Methods: The sample was 1,500 school children of the age group 12-15 years age. A pretested, close ended questionnaire was administered in the form of extensive face to face interview to understand student knowledge, attitudes and behavior related to tobacco use and its health impact and to assess the prevalence of tobacco use including smoked, smokeless and other forms of tobacco. Oral health status was assessed using the Community Periodontal Index (CPI). Frequency distribution, Chi-square tests and Odd's ratio was calculated. Results: Prevalence of tobacco usage amongst the prevalence was 20.4%: 9.2% reported smoking, 15.8% used tobacco in the chewable form and 25.3% children were involved in consuming betel nut/areca nuts. The OR (Odd's ratio) for calculus formation was highest for guthka chewers (OR=14.322), paan masala chewers had the highest odds of developing bleeding on probing when compared to the others. Conclusions: There is an urgent need to launch school-based tobacco prevention programs for community awareness of children and the public, as preventing the initiation of a habit is far easier than stopping it.
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Tiwari, Arjun Prasad,Joshi, Mahesh Kumar,Lee, Joshua,Maharjan, Bikendra,Ko, Sung Won,Park, Chan Hee,Kim, Cheol Sang Elsevier 2017 Colloids and surfaces. A, Physicochemical and engi Vol.520 No.-
<P><B>Abstract</B></P> <P>Polycaprolactone (PCL) based electrospun membranes possess many favorable characteristics such as flexibility, high mechanical properties, and non-toxicity, all of which are required for tissue engineering applications. However, their hydrophobic nature and low biocompatibility limit their uses. To overcome these drawbacks, we propose highly biocompatible and hydrophilic heterogeneous scaffolds from a blend of PCL with polyethylene glycol (PEG) that is composed of nano-nets along with backbone/main fibers via an electro-spinning/netting (ESN) technique. Different scaffolds were fabricated by varying the mass composition of PCL to PEG and evaluated physicochemically and biologically. Scanning electron microscopy showed that the PCL/PEG membranes were of a bimodal structure consisting of backbone/main fibers (diameter range=350–600nm) and ultrathin nano-nets while the pure PCL mat was composed of only backbone fibers (diameter range=550–800nm). The nano-nets were composed of ultrathin nano-wires with an average diameter of 10–20nm, shaped in a hexagonal form. We have also prepared the PCL/PEG membranes without nano-nets and compared them to heterogeneous membranes in order to describe the effect of the nano-nets by well distinguishing the effect of PEG on tissue engineering applications such as wettability, biocompatibility, and biomineralization. The results showed that heterogeneous scaffolds exhibit enhanced wettability, mechanical stability, biocompatibility, and mineralization compared to pure PCL and PCL/PEG scaffolds without nano-nets, which confirmed that the nano-nets in the membranes had positive effects for tissue engineering applications. Findings from this study have revealed that the heterogeneous fibrous membrane could be useful in the design and tailoring of a suitable structure as a scaffold for bone tissue engineering.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Heterogeneous fibrous membrane was reported from PCL/PEG first time via electro-spinning/netting (ESN). </LI> <LI> Heterogeneous membrane was consisting of thicker/backbone fibers and ultrathin nano-nets. </LI> <LI> Hydrophilicity and mineralization were improved with incorporation of PEG into PCL fibers. </LI> <LI> Heterogeneous scaffolds showed better support for cell activities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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