A new empirical structure factor for real liquids using internal pressure

Ravi, Satyam; Kalidoss, M.; Srinivasamoorthy, R.; Amorós, J.

doi:10.1016/s0378-3812(00)00468-4

Cited by 18 publications

(3 citation statements)

References 15 publications

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“…A drastic increase, almost twice, could be observed in the velocity. Since, the compressibility β=1/U 2 ρ, the value of β has reduced to half, indicating the reduction in molecular interaction energies [37,38] . Hence the feasibility of both the drug and PFD existing together in the form of emulsion for a longer period of time is substantiated.…”

Section: Resultsmentioning

confidence: 99%

Improved Performance of Carbamazepine and Benzodiazepine by Oxygen Enrichment through Perfluorodecalin for Lennox-Gastaut Type of Seizures

Natchimuthu¹,

Ravi²,

Amorós³

2021

ijps

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Natchimuthu et al.: Oxygen Enrichment through PerfluorodecalinLennox-Gastaut syndrome is commonly characterized by a triad of features including multiple seizure types, intellectual disability or regression. The long-term prognosis for Lennox-Gastaut syndrome is generally poor due to uncontrolled seizures. Lennox-Gastaut syndrome type of seizures is epilepsy which is due to abnormal vibrations occurring in seizures. During the time of such abnormal vibrations, both the seizures and the lungs suffer a lack in oxygen content to a considerable extent. This results in prolonged vibrations and loses of nervous control. As a neuro-lung protective strategy, a novel attempt has been made to enrich both seizures and lungs with oxygen content through the support of perfluorodecalin (an excellent oxygen carrier) C 10 F 18 along with an enhancement in the antiepileptic activity by the two chosen antiepileptic drugs carbamazepine and benzodiazepine. The ultraviolet-visible spectrophotometer, fluorescence spectrograph, ultrasonic laser diffraction and scanning electron microscope studies reveals the co-existence of fluorine and drug in the emulsion produced by the sonication of both perfluorodecalin and the drug together. The presence of adequate fluorine and carbon play a catalytic role in ensuring the oxygen content and the antiepileptic activity of drug components.

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Section: Resultsmentioning

confidence: 99%

Improved Performance of Carbamazepine and Benzodiazepine by Oxygen Enrichment through Perfluorodecalin for Lennox-Gastaut Type of Seizures

Natchimuthu¹,

Ravi²,

Amorós³

2021

ijps

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“…Ravi et al 12 derived the structure factor ( ) Q S of liquid using internal pressure. They generalized an EOS for hard-sphere fluid to a real fluid (pseudo van der Waals equation) given as: 19) where σ is the hard -core diameter of fluids.…”

Section: Internal Pressure and Intermolecular Forcesmentioning

confidence: 99%

Chapter 16. Internal Pressure and Internal Energy of Saturated and Compressed Phases

Abdulagatov¹,

Magee²,

Полихрониди³

et al. 2017

Enthalpy and Internal Energy

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Following a critical review of the field, a comprehensive analysis is provided of the internal pressure of fluids and fluid mixtures and its determination in a wide range of temperatures and pressures. Further, the physical meaning is discussed of the internal pressure along with its microscopic interpretation by means of calorimetric experiments. A new relation is explored between the internal pressure and the isochoric heat capacity jump along the coexistence curve near the critical point. Various methods (direct and indirect) of internal pressure determination are discussed. Relationships are studied between the internal pressure and key thermodynamic properties, namely expansion coefficient, isothermal compressibility, speed of sound, enthalpy increments, and viscosity. Loci of isothermal, isobaric, and isochoric internal pressure maxima and minima were examined in addition to the locus of zero internal pressure. Details were discussed of the new method of direct internal pressure determination by a calorimetric experiment that involves simultaneous measurement of the thermal pressure coefficient () V

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“…Hence forth, from the X-ray diffraction studies on liquids, we have the equation for the static structure factor S ( q ) as S ( q ) = 1 + 4 π ρ n q ∫ [ g true( r true) − 1 ] .25em sin .25em q r .25em normald r where ρ n is the number density and q the momentum transfer. At long wavelength limit, that is, q → 0, the above equation reduces to an analytical expression for the equation of state for liquids as S ( 0 ) = ρ n k β T Here, S (0) is nothing but the equation of state (E.O.S). – Hence, we could write X anl ( y ) = ρ n k T β T Depending upon the interactions (existing in the liquid) that one could consider, the expression for X anl ( y ) takes four different forms given by the Percus−Yevick virial approach (PY), scaled particle theory (SPT), Mansoori−Carnahan−Starling−Leland (MCSL), and Matyushov−Ladanyi (ML) as X PY anl ( y ) = true( 1 + 2 y…”

Section: Theoretical Modelmentioning

confidence: 99%

Effective Method of Characterizing Specific Liquid Fluorocarbon Interactions Using Ultrasound

Ravi¹,

Amorós²,

Kulandaisamy³

2008

J. Phys. Chem. B

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Several studies have used the analytical results available for structure factor, osmotic pressure, vapor pressure, and suspension viscosity to characterize nanoparticle interactions. In this work a novel attempt has been made to characterize seven different types of liquid per fluorocarbon nanoparticles (LPFC-np) by estimating packing factor, segment diameter, chemical potential, Rao's constant, and adiabatic and isothermal compressibilities using experimental ultrasonic velocity as input. The segment diameter has also been examined by using experimental surface tension and viscosity for comparison. The calculations were extended for different temperatures involving four different equations of state. We have tested the sensitivity of all these parameters to a very small change in the heat capacity ratio. This extensive calculation helps to make a reasonable description about the interactions among the LPFC-np. Also a better correlation could be determined between the interaction of ultrasound with LPFC-np (as a facilitator) and the pure absorption (propagation) of ultrasound by the entire system.

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A new empirical structure factor for real liquids using internal pressure

Cited by 18 publications

References 15 publications

Improved Performance of Carbamazepine and Benzodiazepine by Oxygen Enrichment through Perfluorodecalin for Lennox-Gastaut Type of Seizures

Improved Performance of Carbamazepine and Benzodiazepine by Oxygen Enrichment through Perfluorodecalin for Lennox-Gastaut Type of Seizures

Chapter 16. Internal Pressure and Internal Energy of Saturated and Compressed Phases

Effective Method of Characterizing Specific Liquid Fluorocarbon Interactions Using Ultrasound

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