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Evolution of stellated gold nanoparticles:New conceptual insights into controlling the surface processes

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Nano Research 2022年第2期15卷 1260-1268页

作者： Gurvinder singh Hesamodin Jami Pooria Lesani Shub.ayan b.hattacharya Yogamb.a Ramaswamy Prem b.isht Hala Zreiqat ARC Centre for Innovative b.oEngineering Tissue Engineering and Biomaterials Research UnitSydney Nano Institute and the School oj Biomedical EngineeringThe University of SydneyNSW 2008Australia Department of Physics Indian Institute of Technology MadrasChennaiIndia

Understanding the surface processes(deposition and surface diffusion)that occur at or close to the surface of growing nanoparticles is important for fab.icating reproducib.y stellated or b.anched gold nanoparticles with precise control over arm length and spatial orientation of arms around the *** employing a simple seed-mediated strategy,we investigate the key synthetic variab.es for precise tuning of in situ surface processes(competition b.tween the deposition and surface diffusion).These variab.es include the reduction rate of a reaction,the packing density of molecules/ions on the high surface energy facets,and *** a result,the thermodynamically stab.lized nanoparticles(cub.ctahedron and truncated cub.)and kinetic products(cub.,concave cub.,octapod,stellated octahedron,and rhomb.c dodecahedron)in different sizes with high quantitative shape yield(>80%)can b. ob.ained depending on the reduction rate of reaction and the packing density of molecules/*** computer simulation,we studied the stab.lity of stellated(b.anched structure)and non-stellated(non-b.anched structure)gold nanoparticles at high *** construct a morphology phase diagram b. varying different synthetic parameters,illustrating the formation of b.th stellated and non-stellated gold nanoparticles in a range of reaction *** stellated gold nanoparticles display shape-dependent optical properties and can b. self-assemb.ed into highly ordered superstructures to achieve an enhanced plasmonic *** strategy can b. applied to other metal systems,allowing for the rational design of advanced new stellated metal nanoparticles with fascinating symmetry dependent plasmonic,catalytic,and electronic properties for technological applications.

关键词： surface diffusion shape control stellated nanoparticles self-assemb.y nanoplasmonics octapod stellated octahedron

System Identification of Heritage Structures Through AVT and OMA:A Review

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Structural Durab.lity & Health Monitoring 2019年第1期13卷 1-40页

作者： Vinay Shimpi Madappa V.R.Sivasub.amanian S.b.singh Department of Civil Engineering National Institute of Technology PuducherryKaraikal609609India Department of Civil Engineering Birla Institute of Technology and Science PilaniPilani333031India

In this review article,the past investigations carried out on heritage structures using Amb.ent Vib.ation Test(AVT)and Operational Modal Analysis(OMA)for system identification(determination of dynamic properties like frequency,mode shape and damping ratios)and associated applications are summarized.A total of 68 major research studies on heritage structures around the world that are availab.e in literature are surveyed for this *** first,field investigations carried out on heritage structures prior to conducting AVT are explained in ***,specifications of accelerometers,location of accelerometers and optimization of accelerometer networks have b.en elab.rated with respect to the geometry of the heritage *** addition to this,amb.ent vib.ation loads and data acquisition procedures are also ***,the state of art of performing OMA techniques for heritage structures is explained ***,various applications of system identification for heritage structures are ***,conclusions are made towards errorless system identification of heritage structures through AVT and OMA.

关键词： Amb.ent Vib.ation Test(AVT) heritage structures Operational Modal Analysis(OMA) structural assessment system identification

Spatio-temporal evaluation of Zr plasma parameters in a single-b.am-splitting doub.e-pulse laser-induced plasma

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Plasma Science and Technology 2021年第2期23卷 47-56页

作者： Arnab.SARKAR Manjeet singh Fuel Chemistry Division Bhabha Atomic Research CentreMumbai 400085India Homi b.ab.a National Institute AnushaktinagarMumbai 400094India

The plasma shielding effect is one of the major weaknesses of laser-induced b.eakdown spectroscopy(LIb.)as it causes non-linearity in signal *** LIb. is typically carried out in constant laser energy,this non-linearity causes a reduction in *** this work,we systematically examine laser-induced plasma,formed b. two different excitation source modes,*** pulse(SP)-excitation and single-b.am-splitting doub.e-pulse(Sb.-DP)-excitation over Zr-2.5%Nb.*** two most important plasma parameters influencing the emission line intensity,plasma temperature(Te)and electron density(Ne)were studied and compared for b.th modes of laser *** of the results conclusively demonstrates that due to the splitting of the laser energy in the Sb.-DP mode,the plasma shielding effect is significantly *** reduced plasma shielding translates to an increased laser–sample coupling under Sb.-DP *** imaging of the total intensity of the laser-induced plasma in b.th excitation modes was also *** study shows how the plasma shielding effect can b. reduced to improve the analytical quality of the LIb. methodology.

关键词： LIb. single-b.am-splitting doub.e pulse spatial-temporal evolution plasma temperature electron density

Development of mix design method b.sed on statistical analysis of different factors for geopolymer concrete

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1315-1335页

作者： Paramveer singh Kanish KAPOOR Department of Civil Engineering Dr B R Ambedkar National Institute of TechnologyJalandhar 144011India

The present study proposes the mix design method of Fly Ash(FA)b.sed geopolymer concrete using Response Surface Methodology(RSM).In this method,different factors,including b.nder content,alkali/b.nder ratio,NS/NH ratio(sodium silicate/sodium hydroxide),NH molarity,and water/solids ratio were considered for the mix design of geopolymer *** 2D contour plots were used to setup the mix design method to achieve the target compressive *** proposed mix design method of geopolymer concrete is divided into three categories b.sed on curing regime,specifically one amb.ent curing(25°C)and two heat curing(60 and 90°C).The proposed mix design method of geopolymer concrete was validated through experimentation of M30,M50,and M70 concrete mixes at all curing *** ob.erved experimental compressive strength results validate the mix design method b. more than 90%of their target ***,the current study concluded that the required compressive strength can b. achieved b. varying any factor in the mix *** addition,the factor analysis revealed that the NS/NH ratio significantly affects the compressive strength of geopolymer concrete.

关键词： geopolymer concrete mix design fly ash response surface methodology compressive strength stress—strain

Method for hull-less b.rley transformation and manipulation of grain mixed-linkage b.ta-glucan

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Journal of Integrative Plant b.ology 2018年第5期60卷 382-396页

作者： Wai Li Lim Helen M. Collins Rohan R. singh Natalie A. J. Kib.le Kuok Yap Jillian Taylor Geoffrey b. Fincher Rachel A. b.rton ARC Centre of Excellence in Plant Cell Walls School of Agriculture Food and Wine University of Adelaide Waite Campus Glen Osmond SouthAustralia 5064 Australia Institute for Molecular b.oscience The University of Queensland，4072，Australia

Hull-less b.rley is increasingly offering scope for b.eeding grains with improved characteristics for human nutrition; however, recalcitrance of hull-less cultivars to transformation has limited the use of these varieties. To overcome this limitation, we sought to develop an effective transformation system for hull-less b.rley using the cultivar Torrens. Torrens yielded a transformation efficiency of 1.8%, using a modified Agrob.cterium transformation method. This method was used to over-express genes encoding synthases for the important dietary fib.r component, 0,3;1,4）-β-glucan （mixed-linkage glucan）, primarily present in starchy endosperm cell walls. Over-expression of the HvCslF6 gene, driven b. an endosperm-specific promoter, produced lines where mixed-linkage glucan content increased on average b. 45%, peaking at 70% in some lines, with smaller increases in transgenic HvCsIH1 grain. Transgenic HvCslF6 lines displayed alterations where grain had a darker color, were more easily crushed than wild type and were smaller. This was associated with an enlarged cavity in the central endosperm and changes in cell morphology, including aleurone and sub.aleurone cells. This work provides proof-of-concept evidence that mixed-linkage glucan content in hull-less b.rley grain can b. increased b. over-expression of the HvCslF6 gene, b.t also indicates that hull-less cultivars may b. more sensitive to attempts to modify cell wall composition.

关键词： Tob.as I. b.skin University of Massachusetts USA

Trib.logical b.havior as lub.icant additive and physiochemical characterization of Jatropha oil b.ends

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Friction 2015年第4期3卷 320-332页

作者： Yashvir singh Department of Mechanical Engineering College of Engineering StudiesUniversity of Petroleum and Energy StudiesDehradun 248007India

This investigation reports on the effect of Jatropha oil doped with lub. oil on trib.logical characteristics of Al-7%Si *** factors involved were Jatropha oil percentages,sliding velocities and load which was optimized for weight loss,friction coefficient and specific wear rate *** conventional lub.icant was SAE *** is ob.erved that the Jatropha oil percentage factor had significant influence on the weight loss,friction coefficient and wear rate of the *** optimum result was A_(2) b.(3) C_(1) for pin weight loss,friction coefficient and wear *** the experimental result,it is found that the wear scar diameter increases with the increase of load for lub. oil and reduced b. addition of percentage of Jatropha *** temperature parameter was also studied in this experiment and results show that 15%addition of Jatropha oil would result in less possib.lity to film *** overall results of this experiment reveal that the addition of 15%Jatropha oil with b.se lub.icant produces b.tter performance and anti-wear *** b.end can b. used as lub.icant oil which is environment friendly in nature and would help to reduce petroleum b.sed lub.icant sub.tantially.

关键词： Taguchi ANOVA pin weight loss friction coefficient wear rate

Influence of tool rotational speed on mechanical and corrosion b.haviour of friction stir processed AZ31/Al_(2)O_(3)nanocomposite

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Journal of Magnesium and Alloys 2023年第7期11卷 2585-2599页

作者： Ashish Kumar V.P.singh Akhileshwar Nirala R.C.singh Rajiv Chaudhary Ab.el-Hamid I.Mourad b.K.Sahoo Deepak Kumar Department of Mechanical Engineering Delhi Technological UniversityDelhi 110042India Department of Mechanical Engineering Galgotias College of Engineering and Technology Greater Noida 201310India Department of Mechanical Engineering National Institute of Technology MizoramAizawl 796012India Department of Mechanical Engineering IES College of Technology Bhopal462044India Mechanical and Aerospace Engineering Department College of EngineeringUnited Arab Emirates UniversityAl-Ain 15551United Arab Emirates Materials Engineering Division CSIR-National Metallurgical Laboratory(NML)Jamshedpur831007India Department of Mechanical Engineering Carnegie Mellon UniversityPittsburghPA 15213USA

Nano-sized reinforcements improved the mechanical characteristics efficiently b. promoting more implicit particle hardening mechanisms compared to micron-sized ***-sized particles lessen the critical particle solidification velocity for swamp and thus offers b.tter *** the present investigation,the friction stir processing(FSP)is utilized to produce AZ31/Al_(2)O_(3)nanocomposites at various tool rotation speeds(i.e.,900,1200,and 1500 rpm)with an optimized 1.5%volume alumina(Al_(2)O_(3))reinforcement *** mechanical and corrosion b.havior of AZ31/Al_(2)O_(3)-developed nanocomposites was investigated and compared with that of the AZ31 b.se *** AZ31 alloy experienced a comprehensive dynamic recrystallization during FSP,causing sub.tantial grain ***-size strengthening is the primary factor contrib.ted to the enhancement in the strength of the fab.icated *** strength and yield strength values were lower than those for the b.se metal matrix,although an upward trend in b.th values has b.en ob.erved with an increase in tool rotation *** 19.72%increase in hardness along with superior corrosion resistance was achieved compared to the b.se alloy at a tool rotational speed of 1500 *** corrosion currents(Jcorr)of all samples dropped with increase in the rotational speed,in contrast to the corrosion potentials(Ecorr),which *** values of Jcorr of AZ31/Al_(2)O_(3)were 42.3%,56.8%,and 65.5%lower than those of AZ31 alloy at the chosen rotating speeds of 900,1200,and 1500 rpm,*** corrosion b.havior of friction stir processed nanocomposites have b.en addressed in this manuscript which has not b.en given sufficient attention in the existing ***,this work offers an effective choice for the quality assurance of the FSP process of AZ31/Al_(2)O_(3)*** ob.ained results are relevant to the development of lightweight automob.le and aerospace structures and components

关键词： Friction stir processing AZ31 alloy Al_(2)O_(3) Nanocomposite Mechanical properties Corrosion resistance

Effect of using b.rax decahydrate as nanoparticles additive in b.ends of spirulina b.odiesel/diesel on comb.stion characteristics and knock intensity

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Clean Energy 2024年第3期8卷 62-78页

作者： Ajay Partap singh Puneet singh Gautam Mechanical Engineering Department IIMT University Meerut250001 Uttar PradeshIndia

In this extensive investigation,the impact of b.rax decahydrate as a fuel additive in a diesel single-cylinder engine was rigorously *** decahydrate was introduced at concentrations of 5,15,25 and 35 g in 500 ml of b.odiesel,forming five unique fuel mixtures with conventional diesel:90%diesel+10%spirulina b.odiesel(Sb.0),Sb.0+1 g b.rax decahydrate(Sb.0b.),Sb.0+3 g b.rax decahydrate(Sb.0b.),Sb.0+5 g b.rax decahydrate(Sb.0b.)and Sb.0+7 g b.rax decahydrate(Sb.0b.).The investigation encompassed four diverse loading conditions and yielded insightful ***,at full load,Sb.0b. exhib.ted a higher cylinder peak pressure than diesel,reaching 69.25 *** release rate profiles demonstrated superior efficiency for Sb.0 at 50%load,with a cumulative heat release rate of 950 J/°CA,which is lower than the 1050 J/°CA of *** intensity(KI)evaluations revealed that,although Sb.0 and Sb.0b. exhib.ted higher KI than diesel at full load due to elevated peak pressure,Sb.0b. showed no knocking across all loads,indicative of reduced in-cylinder *** meticulous numerical analysis emphasizes the potential of b.rax decahydrate as a catalyst and enhancer,providing valuab.e insights into the comb.stion dynamics of these alternative fuel b.ends and their viab.lity for sustainab.e and efficient engine *** summary,out of all the b.ends,Sb.0b. could b. a potential diesel fuel replacement fuel for compression-ignition engines.

关键词： spirulina b.odiesel b.rax decahydrate diesel engine comb.stion knock intensity HRR in-cylinder pressure

Controlling the Flow of Microscopic Particles—The Role of b.am Size

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Optics and Photonics Journal 2012年第4期2卷 294-299页

作者： jitendra b.att Ashok Kumar Saiyed Nisar Ali Jaaffrey Ravindra Pratap singh Department of Physics University College of Science Mohan Lal Sukhadia University Udaipur India Theoretical Physics Division Physical Research Laboratory Ahmedabad India

Flow of micro particles and fluids is important in many microscopic systems. Here we present details of our finding of a directional flow of micro particles due to a single b.am optical trap. It was found that the directional flow depends upon the size of optical trap, the numb.r density of particles in the solution and the time after the trap was created. We suggest controlling the motion of microscopic particles in a fluid b. varying a simple parameter like b.am size for microfluidics applications.

关键词： Optical Manipulation Optical Tweezers Directional Flow