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      Melting Behaviour of Bi1-xSbx Free Standing Alloy Nanoparticles Synthesized via Solvothermal Route

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          Abstract

          The present investigation aims at understanding the effect of size on melting behaviour of free standing alloy nanoparticles. Alloy nanoparticles of Bi1-xSbx (x=0.12, 0.25, 0.50 and 0.75) have been synthesized by solvothermal route using sodium borohydride (NaBH4) as a reducing agent. The samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The melting behaviour of alloys was determined by differential scanning calorimetry (DSC). The formation of different solid solution phases of Bi-Sb alloy has been confirmed by detailed XRD studies. Uniform cuboctahedral as well as spherical morphology of alloy nanoparticles has been observed in TEM with average particle size of 40±9 nm in Bi0.75Sb0.25 specimen. DSC studies indicate the depression in the melting temperature of the nanoparticles as compared to the bulk alloy of same composition.

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          Size-dependent melting of silica-encapsulated gold nanoparticles.

          T Dhanasekaran, Dan Meisel, Z. Zhang … (2002)
          We report on the size dependence of the melting temperature of silica-encapsulated gold nanoparticles. The melting point was determined using differential thermal analysis (DTA) coupled to thermal gravimetric analysis (TGA) techniques. The small gold particles, with sizes ranging from 1.5 to 20 nm, were synthesized using radiolytic and chemical reduction procedures and then coated with porous silica shells to isolate the particles from one another. The resulting silica-encapsulated gold particles show clear melting endotherms in the DTA scan with no accompanying weight loss of the material in the TGA examination. The silica shell acts as a nanocrucible for the melting gold with little effect on the melting temperature itself, even though the analytical procedure destroys the particles once they melt. Phenomenological thermodynamic predictions of the size dependence of the melting point of gold agree with the experimental observation. Implications of these observations to the self-diffusion coefficient of gold in the nanoparticles are discussed, especially as they relate to the spontaneous alloying of core-shell bimetallic particles.
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            Recent progress in the synthesis of inorganic nanoparticles.

            S W Matte, A Govindaraj, Raj Rao … (2012)
            Nanoparticles probably constitute the largest class of nanomaterials. Nanoparticles of several inorganic materials have been prepared by employing a variety of synthetic strategies. Besides synthesizing nanoparticles, there has been considerable effort to selectively prepare nanoparticles of different shapes. In view of the great interest in inorganic nanoparticles evinced in the last few years, we have prepared this perspective on the present status of the synthesis of inorganic nanoparticles. This article includes a brief discussion of methods followed by reports on the synthesis of nanoparticles of various classes of inorganic materials such as metals, alloys, oxides chalcogenides and pnictides. A brief section on core-shell nanoparticles is also included.
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              The melting behavior of aluminum nanoparticles

              S.L. Simon, J. Sun (2007)
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                Author and article information

                Contributors
                Mayanglambam Manolata Devi: Role: ND
                Krishanu Biswas: Role: ND
                Journal
                Journal ID (publisher): mr
                Title: Materials Research
                Abbreviated Title: Mat. Res.
                Publisher: ABM, ABC, ABPol (São Carlos )
                ISSN: 1980-5373
                Publication date (Print): November 2015
                Volume: 18
                Issue: suppl 1
                Pages: 55-60
                Affiliations
                [1 ] Indian Institute of Technology India
                Article
                Publisher ID: S1516-14392015000700055
                DOI: 10.1590/1516-1439.335214
                SO-VID: e7512b9b-6588-4cbe-a3d7-a327986a941f
                License:

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-1439&lng=en
                Categories
                Subject: ENGINEERING, CHEMICAL
                Subject: MATERIALS SCIENCE, MULTIDISCIPLINARY
                Subject: METALLURGY & METALLURGICAL ENGINEERING

                ScienceOpen disciplines: General materials science,General engineering
                Keywords: solvothermal route,nanoalloys,X-ray diffraction,transmission electron microscopy,melting,solidification,differential scanning calorimetry
                Data availability:
                ScienceOpen disciplines: General materials science, General engineering
                Keywords: solvothermal route, nanoalloys, X-ray diffraction, transmission electron microscopy, melting, solidification, differential scanning calorimetry

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