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Enhancement of Elastic Modulus of Epoxy Resin with Carbon Nanotubes

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World Journal of Nano Science and Engineering 2011年第1期1卷 1-6页

作者： vijay kumar Srivastava 不详

Nanocomposites consisting of multiwall carbon nanotubes (MWCNT) and epoxy resin were produced by a standard calendaring technique. In this study, 3% multiwall carbon nanotube particles were dispersed in epoxy resin by weight to produce the multiwall carbon nanotubes/epoxy composite. Nanohardness and Raman spectroscopy tests were used to obtain the modulus of elasticity and Raman intensity of MWCNTs/ epoxy resin composite. The results show that the Raman intensity increased with the increase of Raman shift and Raman intensity also affected with the reinforcement of multiwall carbon nanotubes and 1% exposure of laser power. Also, nanohardness increased with increase of modulus of elasticity, which indicated that the toughness of epoxy resin improved with the addition of multiwall carbon nanotubes.

关键词： Epoxy Resin Multiwall Carbon Nanotubes Nanohardness Raman Spectroscopy Modulus of Elasticity

High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

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Nano Research 2015年第7期8卷 2317-2328页

作者： Hakimeh Zare Maziar Marandi Somayeh Fardindoost vijay kumar Sharma Aydan Yeltik Omid Akhavan Hilmi Volkan Demir Nima Taghavinia Institute for Nanoscience and Nanotechnology Shafif University of Technology Tehran 14588 Iran Department of Physics Faculty of Sciences Arak University Arak 38156-8-8349 Iran Department of Physics Department of Electrical and Electronics Engineering and UNAM-Institute of Materials Science and Nanotechnology Bilkent University Ankara Turkey Luminous Center of Excellence for Semiconductor Lighting and Displays Microelectronics Division School of Electrical and Electronics Engineering and Physics and Applied Physics Division School of Physical and Mathematical Sciences Nanyang Technological University Singapore 639798 Singapore Physics Department ShafifUniversity of Technology Tehran 14588 Iran

We report high-efficiency CdTe/CdS core/shell nanocrystals synthesized in water by epitaxially growing CdS shells on aqueous CdTe cores at room temperature, enabled by the controlled release of S species under low-intensity ultraviolet （UV） light illumination. The resulting photo-induced dissociation of S2O2- ions conveniently triggers the formation of critical two-dimensional CdS epitaxy on the CdTe surface at room temperature, as opposed to initiating the growth of individual CdS core-only nanocrystals. This controlled colloidal hetero-epitaxy leads to a substantial increase in the photoluminescence （PL） quantum yield （QY） of the shelled nanocrystals in water （reaching 64%）. With a systematic set of studies, the maximum PL QY is found to be almost independent of the illuminating UV intensity, while the shell formation kinetics required for reaching the maximum QY linearly depends on the illuminating UV intensity. A stability study of the QD films in air at various temperatures shows highly improved thermal stability of the shelled QDs （up to 120 ℃ in ambient air）. These results indicate that the proposed aqueous CdTe/CdS core/shell nanocrystals hold great promise for applications requiring efficiency and stability.

关键词： CdTe/CDs,core/shell nanocrystal thermal stability photochemical

Surface defect engineering of metal oxides photocatalyst for energy application and water treatment

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Journal of Materiomics 2021年第2期7卷 388-418页

作者： Pankaj Raizada Vatika Soni Abhinandan kumar Pardeep Singh Aftab Aslam Parwaz Khan Abdullah M.Asiri vijay kumar Thakur Van-Huy Nguyen Advance School of Chemical Sciences Shoolini UniversitySolanHP173229India Center of Excellence for Advanced Materials Research King Abdulaziz UniversityP.O.Box 80203Jeddah21589Saudi Arabia Chemistry Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah21589Saudi Arabia Biorefining and Advanced Materials Research Centre Scotland Rural College(SRUC)EdinburghUnited Kingdom Institute of Research and Development Duy Tan UniversityDa Nang550000Viet Nam

Despite metal oxides offer excellent characteristics in the field of photocatalysis,they often suffer from charge carrier recombination as well as limited visible response,which indeed reduce the charge kinetics process and ultimately reduce the photocatalytic *** engineering is a sophisticated technique to manufacture defects and alter the geometric structure and chemical environment of the *** present study provides an all-inclusive outline of recent developments on the classification of metal oxide defects based on the dimensions of a host crystal ***,surface modification of metal oxides through 0D(point),1D(line),2D(planar),and 3D(volume)defects with their subsequent mechanism and impact on photocatalytic performance are *** wisely amending the morphology(cores along with the shells)and electronic structure of metal oxide photocatalysts(TiO_(2),ZnO,Bi_(2)O_(3),Fe_(2)O_(4) etc.)through different attuned and veritable approaches,their photocatalytic activity can be substantially *** studies on defect engineering not only expose the altered physicochemical features but also modulate the electron-hole pair dynamics,stability,and active radical production for various photoredox *** atomic,as well as electronic configuration,facilitated a photocatalyst material to have different optical features,adsorption properties along with improved carrier transfer as well as isolation ***,the systematic exploration of photocatalytic rudiments of defect rich metal oxide for various applications such as H_(2) evolution,CO_(2) reduction,pollutant degradation,and bacterial disinfection could bring significant research advancement in this field.

关键词： Defect engineering Nanostructured metal oxides Photocatalysis Surface reactions Point defects Dislocations Boundaries Voids

Atropine eye-drop-induced acute delirium:a case report

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General Psychiatry 2020年第3期33卷 197-198页

作者： Prashant Maravi Dheerendra kumar Mishra Amrendra Singh vijay Niranjan Department of Psychiatry Shyam Shah Medical CollegeRewaIndia Department of Psychiatry M.G.M.Medical CollegeIndoreIndia

Atropine is an anticholinergic drug which is used in both parental and topical *** eye-drops of atropine sulfate are used as mydriatic and *** atropine-induced delirium is well known but topical atropine eye-drop-induced delirium cases are very limited in *** this case report,an elderly man underwent cataract surgery and developed delirium after the use of 1%atropine sulfate eye-drops as *** case supports the notion that even atropine eye-drops can cause delirium in patients at therapeutic doses in elderly.

关键词： doses Atropine cataract

Advances in the Structural Composition of Biomass:Fundamental and Bioenergy Applications

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Journal of Renewable Materials 2021年第4期9卷 615-636页

作者： Neha Srivastava Akshay Shrivastav Rajeev Singh Mohammed Abohashrh K.R.Srivastava Safia Irfan Manish Srivastava P.K.Mishra Vijai kumar Gupta vijay kumar Thakur Department of Chemical Engineering and Technology Indian Institute of Technology(BHU)Varanasi221005India Department of Chemical Engineering Madan Mohan Malaviya University of TechnologyGorakhpur273010India Department of Environmental Studies Satyawati CollegeUniversity of DelhiDelhi110052India Department of Basic Medical Sciences College of Applied Medical SciencesKing Khalid UniversityAbhaSaudi Arabia Departentof Biotechnology Faculty of BiosciencesIntegral UniversityLucknow226026India Biorefining and Advanced Materials Research Center Scotland’s Rural College(SRUC)EdinburghEH93JGUK

Increased environmental pollution due to the organic wastes over the world is one of the most burning *** organic wastes lie under the category of biodegradable waste and can be effectively degraded from their complex compound into simple one by the action of microbes or other living ***,lignocellulosic biomass is a major part of the biodegradable waste and belongs to the group of renewable energy source,which can be very effective for bioenergy *** are made up of different compounds such as cellulose,hemicelluloses,lignin and *** from these components,based on the structural analysis biomass also consist of bioactive substances such as carotenoids,flavonoids,lignin and *** review explores a complete overview of the classification,component and the structure of the ***,it discusses how biomasses can play the key role of substrate in many sectors such as industrial bioenergy production including gaseous and liquid biofuels.

关键词： Biomass classification composition bioactive substance biofuels

CADASIL syndrome(cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy)presenting as psychosis

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General Psychiatry 2018年第6期31卷 148-149页

作者： Dheerendra kumar Mishra Aman Kishore vijay Niranjan Department of Psychiatry Shyam Shah Medical College RewaRewaMadhya Pradesh India Masik Aarogyashala Gwalior lndoreMadhya PradeshIndia Department of Psychiatry M.G.M.Medical College IndoreIndoreMadhya PradeshIndia

Cerebral autosomal dominant arteriopathy with subcortical infarct and leukoencephalopathy(CADASIL) is the most common monogenic form of cerebral small-vessel disease characterised by recurrent strokes. Behavioural disturbance also presents in a significant proportion of subjects as neurotic spectrum disorders and psychotic features are rarely reported. In this case report, we highlight a 32-year-old man with CADASIL syndrome, who had overt psychotic symptoms with neurological signs later on.

关键词： CADASIL psychotic cerebral leukoencephalopathy

Numerical simulation of a hydrocarbon fuelled valveless pulsejet

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Propulsion and Power Research 2014年第2期3卷 90-95页

作者： Joseph Kalyan Raj Isac Logu Mohanraj Enumula Srikar Sai vijay kumar Kannan CD-adapco India Private Limited BangaloreKarnataka 560066India Park College of Engineering and Technology CoimbatoreTamilnadu 641659India

Jet propulsion technology has been limited to being identified largely with turbojets and turbo-machinery driven jet *** late there has been a renewed interest in pulsejet technology and it has once again caught the imagination of *** specific characteristics of the pulsejet,such as easy scalability,absence of moving parts,reduced combustion temperatures;lower NOX formation and the like make it possess varied capabilities for use in the field of jet propulsion and the most viable option for small-scale jet *** the current work,a numerical analysis encompassing feasibility and validation of a valveless pulsejet engine was attempted using CD-adapco's STAR-CCM+CFD *** to lack of comprehensive established mathematical laws to govern the working of a pulsejet,most experimental work being performed is done by trial and *** necessitates in-depth computational studies in order to shed more light on the understanding of valveless *** results have been encouraging and in agreement with observed experimental conclusions such as,i)changes in dimensions affect the working of a pulsejet,ii)presence of a flare enhances the working of a pulsejet,and the close agreement in the frequency of *** continuous study,an optimum initial condition was achieved which enabled the pulsejet to begin operation even before 0.05 s,thereby greatly reducing computational costs if a higher time-scale were to be used.

关键词： Pulsejet Pulsed-combustion Jet engines Computational fluid dynamics Eddy-break up model Combustion modelling Propulsion STAR-CCM+

Acute changes in ganglion cell layer thickness in ischemic optic neuropathy compared to optic neuritis using optical coherence tomography

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International Journal of Ophthalmology(English edition) 2020年第1期13卷 120-123页

作者： Peter W.MacIntosh S.vijay kumar V.R.Saravanan Virna M.Shah Illinois Eye and Ear Infirmary University of Illinois at ChicagoChicagoIL 60612USA Neuro-Ophthalmology Service Aravind Eye HospitalCoimbatore 641014India

AIM:To elucidate the changes of different ganglion cell layer(GCL)thinning patterns between the optic neuritis(ON)and non-arteritic anterior ischemic optic neuropathy(NAION).METHODS:A prospective,observational study was conducted to evaluate the timing of GCL changes between acute ON and NAION using optical coherence ***:Thinning on optical coherence tomography in the NAION group occurs as early as 11 d after symptomatic onset of vision loss and follows an altitudinal *** mean superior-inferior GCL thickness difference in the NAION cohort was clinically significant at 5.7μm in the NAION cohort compared to controls of 0.8μm(P=0.032),but not significant in the ON group compared to controls with both groups measuring 1.1μ*** thinning was significant for the ON group compared to controls at 7.2μm(P=0.011)but not the NAION group compared to controls at 1.35μ***:These findings suggest that future treatments for NAION should be given early,and possibly before 11 d in order to prevent GCL and irreversible vision loss.

关键词： optic neuritis non-arteritic ischemic optic neuropathy optical coherence tomography ganglion cell layer

Microstructural, wettability, and corrosion behaviour of TiO_(2) thin film sputtered on aluminium

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Journal of Central South University 2024年第7期31卷 2210-2224页

作者： Rajeev VERMA vijay kumar Saurabh KANGO Amindra KHILLA Rajeev GUPTA Department of Industrial and Production Engineering Dr B R Ambedkar National Institute of Technology JalandharJalandhar-144008PunjabIndia Department of Mechanical Engineering Dr B R Ambedkar National Institute of Technology JalandharJalandhar-144008PunjabIndia Department of Physics School of EngineeringUniversity of Petroleum&Energy StudiesDehradun 248007UttarakhandIndia

The study investigated the application of radiofrequency(RF)-sputtered TiO2 coatings at various temperatures to enhance the hydrophobicity and corrosion resistance of Al6061 *** research aimed to establish a correlation between the coating process and the resulting surface *** roughness and wettability were quantified with a surface profilometer and ***,chemical boiling and salt spray corrosion tests were conducted to evaluate any topographical changes during these *** analysis further involved the use of field-emission scanning electron microscopy(FESEM),energy-dispersive spectroscopy(EDS),and X-ray diffraction(XRD)techniques to characterize the deposited *** findings indicated that the TiO2 coating applied at 500℃exhibited the highest water contact angle and superior corrosion resistance compared to other *** characterization confirmed that this specific TiO_(2) coating at 500℃ effectively delays corrosion due to its hydrophobic behavior,making it durable for industrial applications.

关键词： aluminium TiO_(2) coating radiofrequency-sputtering hydrophobic corrosion