Synthesis of tungsten nanoparticles by solvothermal decomposition of tungsten hexacarbonyl

Sahoo, Prasanta Kumar; Kamal, S.S. Kalyan; Manda, Premkumar; Kumar, T. Jagadeesh; Sreedhar, B.; Singh, A. K.; Srivastava, S. K.; Sekhar, K. C.

doi:10.1016/j.ijrmhm.2009.01.005

Cited by 74 publications

(31 citation statements)

References 39 publications

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“…The most common methods of nanostructures synthesis are broadly classified into physical and chemical methods. Some of the physical methods are pulsed laser ablation [136][137][138], laser deposition and matrix assisted pulsed laser evaporation (MAPPLE) [130,139], and ball milling [133][134][135], while the chemical methods are chemical precipitation [140][141][142], sonoelectrochemical synthesis [143][144][145][146][147][148], spray pyrolysis [149,150], chemical vapour deposition [151][152][153] and thermal decomposition [154]. Details on other methods under these categories can be found in the past 24 publications [38,155,156].…”

Section: Methods Of Preparation Of Nanoparticles and Nanofluidsmentioning

confidence: 99%

The Viscosity of Nanofluids: A Review of the Theoretical, Empirical, and Numerical Models

Meyer

Adio

Sharifpur

et al. 2015

Heat Transfer Engineering

198

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The enhanced thermal characteristics of nanofluids have made it one of the fastest-growing research areas in the last decade. Numerous researches have shown the merits of nanofluids in heat transfer equipment. However, one of the problems is the increase in viscosity due to the suspension of nanoparticles. This viscosity increase is not desirable in the industry, especially when it involves flow, such as in heat exchanger or micro-channel applications INTRODUCTIONColloidal suspension dates back to Maxwell's study in 1873 [1]. Though the idea behind his study was vivid, the imposed problems were too enormous for profitable engineering solutions [2]. In 1995, Choi [3] came up with a pioneering idea based on Maxwell's study and suspended ultrafine particles (nanoparticles) in conventional heat transfer fluids. His invention has opened up a myriad of opportunities in research and development. Nanofluids descriptively are colloidal suspensions containing metallic (Ag, Au, Al, Cu, Ni, etc.), non-metallic (single-and multi-wall carbon nanotube (SWCNT and MWCNT), Si, Graphene, etc.), metallic oxide (Al2O3, CuO, NiO2,TiO2, etc.) and oxides of non-metals (SiO2, SiC, MgO, CaCO3, etc.) nanoparticles suspended in conventional heat transfer fluids such as water, engine oil, ethylene glycol, transformer oil, gear oil or mixture of two or more heat transfer fluids [2,3]. When compared with previous microparticle suspensions in conventional heat transfer fluids, it is a special type of fluid with numerous applications potentials because of its enhanced thermal conductivity, stability and homogeneity [3,4]. Microscale particles in suspensions lead to abrasion, clogging of flow paths, pressure drop and high pumping power requirements, therefore, its sustainability was impossible. Besides, nanofluids can reduce the pumping power in engineering equipment significantly and do not pose the problem of clogging and abrasion of equipment flow paths [5][6][7][8]. Therefore, the design and engineering of physical systems are now being tailored towards using nanofluid as working fluid.The impact of colloidal suspension cuts across the fields of science, biological science, medical, pharmaceutical and engineering. In the context of sustainable energy development and thermal management, nanofluids are becoming more and more significant as the need for efficient thermal management is of paramount importance. Moreover, the level of miniaturisation of devices today as technology advances is overwhelming. Devices such as microprocessors, microelectromechanical systems (MEMS), nanoelectromechanical systems (NEMS), microchannels and lab-on-chips come with high-density heat flux that needs quick heat removal for 3 efficient performance, stability and durability, which, from all indications, could be provided by nanofluids for now [9][10][11][12]. The following are also emerging areas of applications of nanoparticles and nanofluids: (i) they could be useful in medicine in the targeted treatment of malignant cells without damaging healthy tis...

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Section: Methods Of Preparation Of Nanoparticles and Nanofluidsmentioning

confidence: 99%

The Viscosity of Nanofluids: A Review of the Theoretical, Empirical, and Numerical Models

Meyer

Adio

Sharifpur

et al. 2015

Heat Transfer Engineering

198

View full text Add to dashboard Cite

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“…This was then loaded into a 600 • C argon-purged tube furnace to decompose the W(CO) 6 [38]. Upon removal from the furnace, the SWCNT-coated wafer had a gray film covering much of its surface and seemingly uncoated regions that appeared purple to the naked eye.…”

Section: Reaction Of W(co) 6 With Raw and Highly Purified Swcntsmentioning

confidence: 99%

Catalyst Residue and Oxygen Species Inhibition of the Formation of Hexahapto-Metal Complexes of Group 6 Metals on Single-Walled Carbon Nanotubes

Wright

Barron

2017

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Abstract:The reaction of Group 6 metals with SWCNT has the potential to bridge the resistive SWCNT . . . SWCNT junctions by the formation of "Cr(SWCNT) 2 " complexes analogous to Cr(C 6 H 6 ) 2 . This study reports that the formation of such species is very sensitive to oxidation by a residual iron oxide catalyst used for the growth of the SWCNTs and adsorbed/bound oxygen functionality. The reaction of raw HiPco SWCNTs with M(CO) 6 and (C 7 H 8 )M(CO) 3 (M = Cr, W) or (C 6 H 6 )Cr(CO) 3 results in the formation of the Group 6 metal oxides. Annealing and acid treating the HiPco SWCNTs to reduce the catalyst content allows for the observation of zero valent metals by XPS, while the use of very high purity SWCNTs and graphene allows for the addition of primarily zero valent Group 6 metals, including the bis-hexahapto metal complex.

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“…1. The spectrum of tungsten shows a doublet peak with binding energies of 31.6 eV (W4f 7/2 ) and 33.2 eV (W4f 5/2 ) corresponds to elemental W 0 [25]. Similarly for titanium XPS spectrum shows a doublet peak with binding energies of 453.8 eV (Ti2p 3/2 ) and 459.6 eV (Ti2p 1/2 ) corresponds to metallic Ti 0 [32,33].…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, chemical methods can produce nanostructured particles and enhance the sintering process by improving dispersion of various metallic phases, while controlling the contamination and chemical composition. Moreover, chemical approaches have the advantage of controlling particle size, shape and distribution by adjusting various reaction parameters, when compared to the mechanical alloying process [24][25][26][27][28][29][30][31]. Therefore, the present work reports a soft chemical route for preparation of W-Ti nanoalloys of variable compositions.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and sintering behavior of nanostructured W-10–20wt.% Ti alloys synthesized by a soft chemical approach

Sahoo

Srivastava

Kamal

et al. 2015

International Journal of Refractory Metals and Hard Materials

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Synthesis of tungsten nanoparticles by solvothermal decomposition of tungsten hexacarbonyl

Cited by 74 publications

References 39 publications

The Viscosity of Nanofluids: A Review of the Theoretical, Empirical, and Numerical Models

The Viscosity of Nanofluids: A Review of the Theoretical, Empirical, and Numerical Models

Catalyst Residue and Oxygen Species Inhibition of the Formation of Hexahapto-Metal Complexes of Group 6 Metals on Single-Walled Carbon Nanotubes

Microstructure and sintering behavior of nanostructured W-10–20wt.% Ti alloys synthesized by a soft chemical approach

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