Size effect on melting temperature of nanosolids

Qi, Weihong

doi:10.1016/j.physb.2005.06.035

Cited by 238 publications

(160 citation statements)

References 22 publications

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“…The value of 2 depends on the structure of the Nanomaterials. For spherical nanosolids its value may be given by [27]:…”

Section: Structural Characterizationmentioning

confidence: 99%

Effect of Sputtering Area Ratio of Gold/Alumina Target on Microstructure and Optical Absorption Properties of Au Nanoparticles dispersed in Amorphous Alumina Dielectric films

Belahmar¹,

Chouiyakh²,

Fahoume³

2018

JTFR

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Amorphous alumina films containing gold nanoparticles were grown by radio frequency (rf) magnetron sputtering technique, with a variation of area ratio of gold/Alumina target ( 2 3 ⁄ ). Effect of the gold content in the composite films on the microstructural and optical absorption have been investigated. From the X-ray diffraction (XRD) measurements, the texture coefficient, lattice parameter, grain size and strain were calculated and correlated with changing . Contrary to the melting point of free metal cluster, it is found that melting point of gold nanoparticles embedded in amorphous alumina matrix is larger than the melting point of the corresponding bulk material, decreases with increasing size of particles. The surface plasmon resonance peak wavelength, volume fraction and size of gold nanoparticles were determined from the optical absorption spectra of the samples through the MaxwellGarnett effective model fitting, considering the size dependent mean free path limitation of free electrons. The peak wavelength of the surface plasmon resonance (SPR) was found to redshift from 500 nm to 558 nm and size increases from 2.2 nm to 5.8 nm when the 2 3 ⁄ increases from 1.3% to 2.6%, and remain at the same wavelength for larger size.

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“…The value of 2 depends on the structure of the Nanomaterials. For spherical nanosolids its value may be given by [27]:…”

Section: Structural Characterizationmentioning

confidence: 99%

Effect of Sputtering Area Ratio of Gold/Alumina Target on Microstructure and Optical Absorption Properties of Au Nanoparticles dispersed in Amorphous Alumina Dielectric films

Belahmar¹,

Chouiyakh²,

Fahoume³

2018

JTFR

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“…The total cohesive energy of the nanomaterials is the sum of the contribution of the interior atoms and the surface atoms of the nanomaterial, which is expressed as [19] ( ) (1) where is the total number of the atoms, is the total number of the surface atoms on the surface of the nanomaterial and ( ) represents the total number of interiors atoms. is the cohesive energy of the bulk material per atom.…”

Section: Theoretical Modelmentioning

confidence: 99%

Analytical Model for the Size Dependent Melting Entropy and Enthalpy of Nanomaterials

2018

IJMTER

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Abstract-A simple, analytical model for the size dependent melting entropy and enthalpy is discussed by considering the cubo-octahedral structure with the change of the cluster size in the low dimension scale. Using the model, melting entropy and enthalpy of Ag, Al, Cu, Au, Ni and Pb nanomaterials are calculated as a function of cluster size. An increase in melting entropy and enthalpy of nanomaterials is observed with their size. The melting entropy and enthalpy of the nanomaterials increases as the cluster size increases because of a growing fraction of the surface atom which have large mean square displacement. This brings the entropy and enthalpy of solid nanomaterial closer to the liquid state entropy and enthalpy, and leads to decrease in melting entropy and enthalpy as nanomaterial size is reduced. A comparison between theoretical prediction with other theoretical model like as Qi's, Jiang's and Guisbiers model with the available experimental and simulation data. Reasonable agreement between the model prediction and the experimental data is found.

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“…Several examples could be found to illustrate the melting point depression as a function of the particle size, and the reader is referred to these studies [84 -87] . The melting temperature is linearly proportional to the reciprocal of the crystal size and can be expressed in Equation (13) [88] :…”

Section: Melting Pointmentioning

confidence: 99%

“…Furthermore, half of the total bonds of each surface atom do not contribute to the cohesive energy and, therefore, the contribution of the surface bonds to the cohesive energy is expressed as E 0 /2, and the total contribution of the surface atoms to cohesive energy, therefore, assumes the form NE 0 /2. Equation 14 is further elaborated by the consideration of the Avogadro number, A , to account for the energy per mole of nanosolid, E p (Equation 15) [88] :…”

Section: Melting Pointmentioning

confidence: 99%

Why is the nanoscale special (or not)? Fundamental properties and how it relates to the design of nano-enabled drug delivery systems

Otto

Villiers

2013

Nanotechnology Reviews

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Why is the nanoscale special (or not) ?Fundamental properties and how it relates to the design of nano-enabled drug delivery systems Abstract: Nanoscience studies describe natural phenomena at the submicron scale. Below a critical nanoscale limit, the physical, chemical, and biological properties of materials show a marked departure in their behavior compared to the bulk. At the nanoscale, energy conversion is dominated by phonons, whereas at larger scales, electrons determine the process. The surface-to-volume ratio at the nanoscale is immense, and interfacial interactions are markedly more important than at the macroscopic level, where the majority of the material is shielded from the surface. These properties render the nanoparticles to be significantly different from their larger counterparts. Nano-enabled drug delivery systems have resulted from multidisciplinary cooperation aimed at improving drug delivery. Significant improvements in the thermodynamic and delivery properties are seen due to nanotechnology. Hybrid nanodelivery systems, i.e., membranes with nanopores that can gate stimuli-responsive drug release could be a future development. Nanotechnology will improve current drug delivery and create novel future delivery systems. The fundamental properties and challenges of nanodelivery systems are discussed in this review.

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Size effect on melting temperature of nanosolids

Cited by 238 publications

References 22 publications

Effect of Sputtering Area Ratio of Gold/Alumina Target on Microstructure and Optical Absorption Properties of Au Nanoparticles dispersed in Amorphous Alumina Dielectric films

Effect of Sputtering Area Ratio of Gold/Alumina Target on Microstructure and Optical Absorption Properties of Au Nanoparticles dispersed in Amorphous Alumina Dielectric films

Analytical Model for the Size Dependent Melting Entropy and Enthalpy of Nanomaterials

Why is the nanoscale special (or not)? Fundamental properties and how it relates to the design of nano-enabled drug delivery systems

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