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Hussain, Manwar,Ko, Young Hui,Choa, Yong Ho Hindawi Limited 2016 Journal of nanomaterials Vol.2016 No.-
<P>Thermoplastic elastomer composites and nanocomposites were fabricated via melt processing technique by blending thermoplastic elastomer (TPEE) with poly(butylene terephthalate) (PBT) thermoplastic and also by adding small amount of organo modified nanoclay and/or polytetrafluoroethylene (PTFE). We study the effect of polymer blending on the mechanical and thermal properties of TPEE blends with and without nanoparticle additions. Significant improvement was observed by blending only TPEE and virgin PBT polymers. With a small amount (0.5 wt.%) of nanoclay or PTFE particles added to the TPEE composite, there was further improvement in both the mechanical and thermal properties. To study mechanical properties, flexural strength (FS), flexural modulus (FM), tensile strength (TS), and tensile elongation (TE) were all investigated. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used to analyze the thermal properties, including the heat distortion temperature (HDT), of the composites. Scanning electron microscopy (SEM) was used to observe the polymer fracture surface morphology. The dispersion of the clay and PTFE nanoparticles was confirmed by transmission electron microscopy (TEM) analysis. This material is proposed for use as a baffle plate in the automotive industry, where both high HDT and high modulus are essential.</P>
Jagdish Manwar,Kakasaheb Mahadik,L. Sathiyanarayanan,Anant Paradkar,Sanjay Patil 한국한의학연구원 2013 Integrative Medicine Research Vol.2 No.2
Background: Ashwagandharishtha is a liquid polyherbal formulation traditionally prepared by fermentation process using the flowers of Woodfordia fruticosa. It contains roots of Withania somnifera as a major crude drug. Alcohol generated during the fermentation causes the extraction of water insoluble phytoconstituents. Yeasts present on the flowers are responsible for this fermentation. Methods: Total nine formulations of ashwagandharishtha were prepared by fermentation process using traditional Woodfordia fruticosa flowers (ASG-WFS) and using yeasts isolated from the same flowers. During fermentation, kinetic of alcohol generation, sugar consumption, changes in pH and withanolides extraction were studied. All the formulations were tested for in vitro antioxidant potential by 1,1-diphenyl-2-picryl-hydrazyl (DPPH) free radical scavenging, hydrogen peroxide scavenging and total reducing power assay. The results were compared with standard ascorbic acid. Results: Traditional formulation (ASG-WFS) showed the highest activity (p < 0.001) relative to other formulations and standard ascorbic acid. ASG-WFS showed significant (DPPH) free radical scavenging (78.75%) and hydrogen peroxide scavenging (69.62%) at the concentration of 1000 μg/mL and 100 μg/mL, respectively. Conclusion: Traditional process is the best process for preparing ashwagandharishtha to obtain significant antioxidant activity.
Synthesis and characterization of polymer–nanoclay conductive nanocomposites
Ahmad, Irfan,Hussain, Manwar,Seo, Keum-Suk,Choa, Yong-Ho Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of applied polymer science Vol.116 No.1
<P>Polymer–clay nanocomposites based on poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate (PEDOT) : PSS and nanoclay montmorillonite were synthesized and characterized. The doping of PEDOT with polystyrene sulfonate made it water dispersible (PEDOT–PSS). Sodium dodecyl benzene sulfonate (SDBS) and ionic liquid were used to increase the interlayer spacing and the conductivity of the nanocomposites, respectively. The nanocomposite was characterized by various techniques, such as X-ray diffraction (XRD), TEM, surface resistivity, and thermogravimetric measurement analysis. Interlayer spacing increased as a result of the addition of SDBS, and this was confirmed by the 2&thetas; shift observed via XRD analysis. The surface morphology of the conductive coated clay was examined by TEM analysis. Good electrical surface conductivity, interlayer spacing, and polymer coating were observed for the material prepared using the surfactant and conductive ionic liquid. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010</P>
( Tran Xuan Tin ),박성수,( Manwar Hussain ),김희택 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
A facile approach for fabricating polypyrrole/carbon black nanocomposites (PPy/CB) decorated with silver nanoparticles with enhancing the electrocatalysis and the antibacterial property has been carried out via one-pot photopolymerization of pyrrole monomer using silver nitrate as photoinsentizer in the presence of carbon black (CB). Carbon black was functionalized by silane groups to provide anchor sites for the polypyrrole/ silver composite coating. The formation mechanism, structural, morphological properties, and electrical conductivity of the obtained PPy/CB/Ag nanocomposites were studied in detail. The electrical conductivity and thermal stability of the PPy/CB/Ag nanocomposites were higher than those of PPy/CB nanocomposites and pure PPy. The PPy/CB/Ag nanocomposites exhibited a well-defined response to the electrochemical reduction of hydrogen peroxide. Moreover, PPy/CB/Ag nanocomposites also showed excellent antibacterial activity against Escherichia coli bacteria.
( Tran Xuan Tin ),박성수,( Manwar Hussain ),김희택 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
In this research, polypyrrole/silica nanotube/silver nanocomposites (PPy/SiNTs/Ag) were prepared via UV-induced dispersion polymerization of pyrrole monomer using silica nanotubes (SiNTs) as a template and silver nitrate as the photoinitiator. SiNTs were prepared from the natural halloysite nanotubes by the acid-leaching method. The SiNTs were then modified by silane coupling agent (3-APTES) in order to provide anchor sites for depositing of PPy/Ag nanocomposite chains. The formation mechanism, morphological, structure characteristics of the obtained PPy/SiNTs/Ag nanocomposites were reported. The PPy/SiNTs/Ag nanocomposites showed higher electrical conductivity and thermal stability than those of PPy/SiNTs nanocomposites. PPy/SiNTs/Ag nanocomposites exhibited excellent chemical catalytic property in the reduction of methylene blue in the presence of sodium borohydride within few minutes.
Keyur Pankaj. Chande,Narendra U. Manwar,Manoj G. Chandak 대한예방치과학회 2013 International Journal of Clinical Preventive Denti Vol.9 No.4
Objective: The aim of this study is to compare the effect of surface moisture on dentinal tensile bond strength. Methods: Eighty freshly extracted caries free Mandibular first molars were selected. The specimens were randomly divided into four groups of 20 teeth each. Occlusal surface were ground by diamond disc till all occlusal enamel is removed. After treating the occlusal surface of specimens with 37% orthophosphoric acid for 15 sec, specimens were divided into 4 groups namely. Group I (Over wet), Group II (Blot Dry), Group III (One Second Dry) and Group IV (Over Dry). Each group was treated with single bond adhesive (3M ESPE). Composite cylinders were build up using Teflon moulds and cured. Tensile bond strength was tested using INSTRON universal testing machine. The results were analysed statistically. Results: The tensile bond strength values were highest in Group II (Blot dry) and statistically significant. Conclusion: Blot drying after etching provided better bond strength.
( Tran Xuan Tin ),박성수,송시내,( Manwar Hussain ),김희택 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Herein, we have demonstrated a facile and ultrafast technique to obtain carbon nanotubes (CNTs) growth on graphene oxide (GO) surface within just 10 s under ambient conditions via microwave assisted approach. The physicochemical characteristics of the hybrid materials were examined by field emission scanning electron microscope (FESEM), transmission spectroscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, and the mechanism formation was proposed. The obtained data indicated that GO/CNTs hybrid material decorated with silver nanoparticles exhibit good performance for hydrogen peroxide detection with the wide linear detection range of 0.1 to 100 mM, and detection limit of 1.5 μM (S/N ratio 3).
Effect of Chelating Agents and Irrigants on Mineral Content of Root Canal Dentin: An In Vitro Study
Keyur Pankaj Chande,Narendra U Manwar,Manoj G Chandak,Jyoti Lokade,Sneha R Chandak 대한예방치과학회 2014 International Journal of Clinical Preventive Denti Vol.10 No.3
Objective: To evaluate and compare ex vivo the decalcifying effect of 17% ethylenediaminetetraacetic acid (EDTA), 15% citric acid, 37% phosphoric acid and 5.25% sodium hypochlorite on root canal dentin. Methods: Two 2-mm-thick slices were cut from the coronal third of the root of 24 human incisors. Each slice was sectioned into two equal parts. Specimens were assigned to one of four groups (n=24) for immersion in 20 ml of either 17% EDTA, or 15% citric acid, 37% phosphoric acid or 5.25% NaOCl, for three time periods (5, 10, and 15 minutes). The concentration of Ca2+ extracted from the dentine was measured by mass spectrophometry.The amount of calcium extracted was analysed using the Kruskal-Wallis test for global comparisons and the Mann-Whitney U-test for pairwise comparisons. Results: In the three time periods, 17% EDTA and 15% citric acid extracted the largest amount of calcium, with no significant differences between them. The 5.25% NaOCl solution extracted significant amounts of calcium, whereas 17% EDTA extracted 9.3 mg of the calcium in the first 5 min, and 15% citric acid and 37% phosphoric acid had a similar pattern of calcium removal (2.06 mg and 1.82 mg in first 5 minutes, respectively). Conclusion: Solutions of 15% EDTA, 15% citric acid and 5% phosphoric acid decalcify root dentine, with most calcium extracted during the first 5 minutes of action. The efficacy of 15% citric acid and 17% EDTA solutions was significantly greater than that of 37% phosphoric acid solution at each time period (5, 10 and 15 minutes).