Group contribution method: Surface tension of linear and branched alkanes

Randová, Alena; Bartovská, Lidmila

doi:10.1016/j.fluid.2016.09.007

Cited by 15 publications

(13 citation statements)

References 79 publications

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“…The heating effect of vibration energy performances as the temperature changes, and the melt temperature, T , can be expressed as :

T = T_{0} + \frac{Q}{CM} = T_{0} + \frac{ω^{3} A_{0}^{2} e^{- 2 ξ_{0} l} t \sin δ}{4 italicπC}

where T 0 is the initial temperature and C is specific heat capacity of the melt. The increasing melt temperature could reduce the surface tension, γ , of the melt, this process is described by Guggenheim‐Katayama‐van der Waals equation :

γ = γ^{0} {(1 - T / T_{c})}^{n}

where γ 0 and n are constants and T c is the critical temperature of a state change for the polymer. On the other hand, the energy loss of ultrasonic vibration can reduce the contact angle by the heating effect.…”

Section: Theoretical Modelsmentioning

confidence: 99%

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Wall Slip of Linear Polymer Melts During Ultrasonic‐assisted Micro‐injection Molding

Gao

Qiu

Ouyang

et al. 2018

Polymer Engineering & Sci

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The wall slip of linear polymer melts under ultrasonic vibration is investigated by correcting the slip mechanism, and melt flow behaviors in ultrasonic‐assisted micro‐injection molding (UμIM) method are discussed. Based on the effect mechanism of ultrasonic vibration on the melt, theoretical models of the critical shear stresses for the onset of weak and strong wall slip during UμIM are established, and the change in rheological properties due to the onset of wall slip under ultrasonic vibration is experimental investigated by a built measurement system. The results show that the onset of weak and strong wall slip of the melt in micro cavity are promoted by ultrasonic vibration, which agree with the built theoretical models, and the melt filling capability in micro cavity is enhanced by reducing apparent viscosity and releasing shear stress of the polymer melt, which improves the molding quality of micro polymer parts via UμIM method. POLYM. ENG. SCI., 59:E7–E13, 2019. © 2018 Society of Plastics Engineers

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“…The heating effect of vibration energy performances as the temperature changes, and the melt temperature, T , can be expressed as :

T = T_{0} + \frac{Q}{CM} = T_{0} + \frac{ω^{3} A_{0}^{2} e^{- 2 ξ_{0} l} t \sin δ}{4 italicπC}

γ = γ^{0} {(1 - T / T_{c})}^{n}

Section: Theoretical Modelsmentioning

confidence: 99%

“…where T 0 is the initial temperature and C is specific heat capacity of the melt. The increasing melt temperature could reduce the surface tension, γ, of the melt, this process is described by Guggenheim-Katayama-van der Waals equation [31]:…”

Section: Adhesion-detachment Wall Slip Under Ultrasonic Vibrationmentioning

confidence: 99%

Wall Slip of Linear Polymer Melts During Ultrasonic‐assisted Micro‐injection Molding

Gao

Qiu

Ouyang

et al. 2018

Polymer Engineering & Sci

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“…The wettability of the liquid on the solid surface is mainly affected by the surface tension of the liquid. The temperature dependence of surface tension γ can be estimated by the Guggenheim‐Katayama‐van der Waals equation (Equation ):

γ ((), T) = γ_{0} {(1 - T / T_{normalc})}^{11 / 9}

where T c denotes the critical temperature 8 . By substituting γ 0 (22.60 mN/m at 297 K) and T c (512.6 K) for methanol, the surface tension at 90°C is estimated to be ~5.0 mN/m.…”

Section: Discussionmentioning

confidence: 99%

Flash desorption of low‐volatility compounds deposited on a heated solid substrate (90°C) by dripping liquid methanol

Usmanov

Ninomiya

2020

Rapid Comm Mass Spectrometry

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Rationale Desorption of low‐volatility compounds deposited on a solid substrate by dripping a methanol drop was explored. Methods Low‐volatility compounds such as drugs and explosives were deposited/dried on the substrate at 35°C. After increasing the temperature to 90°C, 5 μL methanol was dripped onto the substrate. The desorbed analytes were ionized by alternating current corona discharge and analyzed by mass spectrometry. Results Flash desorption for drugs and explosives was observed accompanied by the rapid evaporation of methanol. However, saccharides, fullerene, cholesterol, and gramicidin S were not detected by the present method. Conclusions It was suggested that surface‐active compounds were desorbed at the peripheral front region of the spreading liquid methanol accompanied by rapid evaporation of methanol.

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“…On the other hand, the most common semiempirical correlations used are those based on the corresponding-states principle, the chemical or physical group contributions, or the quantitative structure–property relationships. ,− Thus, models based on the corresponding-state principle show a possible universal behavior of different kinds of fluids. ,− Others are multiple-parameter correlations such as the van der Waals type model, the Weibull type model, and some others . The group contribution method has been used to study the properties of surface tension of alkanes, hydrocarbons, and ionic liquids, − etc. Recently, artificial neural networks have been successfully developed for the calculation of surface tension of different kinds of fluids. ,, In the case of pure silanes, Di Nicola et al have proposed a correlation for the surface tension as a function of liquid viscosity data.…”

Section: Introductionmentioning

confidence: 99%

“…17,25−36 Others are multiple-parameter correlations such as the van der Waals type 37 model, the Weibull 38 type model, and some others. 39 The group contribution method has been used to study the properties of surface tension of alkanes, 40 hydrocarbons, 41 and ionic liquids, 42−44 etc. Recently, artificial neural networks have been successfully developed for the calculation of surface tension of different kinds of fluids.…”

Section: Introductionmentioning

confidence: 99%

Corresponding-States Model for the Correlation and Prediction of the Surface Tension of Silanes

Yang

Tian

Jiang

et al. 2020

Ind. Eng. Chem. Res.

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A new corresponding-states model for the calculation of the surface tension of silanes is proposed. It requires, as input properties, the critical point temperature, the minimum temperature at which one data for the surface tension is available, and the corresponding maximum value of this property. It includes two adjustable coefficients, which are calculated by considering the data available at the DIPPR database for 5 silanes. Then the model is applied to predict the surface tension values for other 31 silanes. Averaged absolute deviations below 12% are found for the 36 silanes, being below 5% for 33 of them. Results obtained by using the other five corresponding-states models available in the literature, one of them specifically designed for silanes, are also obtained. That proposed here gives clearly the best overall results.

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Group contribution method: Surface tension of linear and branched alkanes

Cited by 15 publications

References 79 publications

Wall Slip of Linear Polymer Melts During Ultrasonic‐assisted Micro‐injection Molding

Wall Slip of Linear Polymer Melts During Ultrasonic‐assisted Micro‐injection Molding

Flash desorption of low‐volatility compounds deposited on a heated solid substrate (90°C) by dripping liquid methanol

Corresponding-States Model for the Correlation and Prediction of the Surface Tension of Silanes

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