Contact Angle of Ethanol and n-Propanol Aqueous Solutions on Metal Surfaces

Fan, Li-Jing; Yuan, Xigang; Zhou, Chuanling; Zeng, Aiwu; Yu, Kun; Kalbassi, Mohammad Ali; Porter, K.E.

doi:10.1002/ceat.201000474

Cited by 25 publications

(12 citation statements)

References 16 publications

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“…Methanol mass fraction values in this work were chosen consistent with mass fractions from bubble point measurements. Contact angle measurements for mixtures here are also in qualitative agreement with previously reported results from Fan et al 8 for ethanol and n-propanol aqueous solutions.…”

Section: Contact Angle Measurementssupporting

confidence: 92%

“…6 This result suggests the possibility of a considerable adsorption of methanol at the SS304/solution interface. Fan et al 8 provides experimental data from neutron diffraction studies along with molecular dynamic simulation that show that, even though water and methanol mix in all proportions, there are extended structures that transform into "bipercolating liquid mixtures." The surface structure may be quite complex.…”

Section: Appendix B: Langmuir Isotherm For the Sl And Sv Casesmentioning

confidence: 99%

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Bubble point pressures of binary methanol/water mixtures in fine‐mesh screens

Hartwig

Mann

2013

AIChE Journal

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Binary methanol/water mixture bubble point tests involving three samples of fine-mesh, stainless steel screens as porous liquid acquisition devices are presented in this article. Contact angles are measured as a function of methanol mass fraction using the Sessile Drop technique. Pretest predictions are based on a Langmuir isotherm fit. Predictions and data match for methanol mole fractions greater than 50% when pore diameters are based on pure liquid tests. For all three screens, bubble point is shown to be a maximum at a methanol mole fraction of 50%. Model and data are in disagreement for mole fractions less than 50%, which is attributed to variations between surface and bulk fluid properties. A critical Zisman surface tension value of 23.2 mN/m is estimated, below which contact angles can be assumed to be zero. Solid/vapor and solid/liquid interfacial tensions are also estimated using the equation of state analysis from Neumann and Good.

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Section: Contact Angle Measurementssupporting

confidence: 92%

Section: Appendix B: Langmuir Isotherm For the Sl And Sv Casesmentioning

confidence: 99%

Bubble point pressures of binary methanol/water mixtures in fine‐mesh screens

Hartwig

Mann

2013

AIChE Journal

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“…Besides a higher viscosity of the solvent [63], an increase in the hydrophobicity of the screw surface or a decrease in the gap size [64] could prevent the solvent from wetting the gaps. In the present case, the screw elements are made of high quality, pharmaceutical-grade stainless steel that generally has good wetting behaviour for water [65] and an even better one for aqueous ethanol solutions [66]. Therefore, the steel type in combination with the solvent employed in the present case promotes wetting in gaps.…”

Section: Swab Test Resultsmentioning

confidence: 98%

Novel Cleaning-in-Place Strategies for Pharmaceutical Hot Melt Extrusion

et al. 2020

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To avoid any type of cross-contamination, residue-free production equipment is of utmost importance in the pharmaceutical industry. The equipment cleaning for continuous processes such as hot melt extrusion (HME), which has recently gained popularity in pharmaceutical applications, necessitates extensive manual labour and costs. The present work tackles the HME cleaning issue by investigating two cleaning strategies following the extrusion of polymeric formulations of a hormonal drug and for a sustained release formulation of a poorly soluble drug. First, an in-line quantification by means of UV–Vis spectroscopy was successfully implemented to assess very low active pharmaceutical ingredient (API) concentrations in the extrudates during a cleaning procedure for the first time. Secondly, a novel in-situ solvent-based cleaning approach was developed and its usability was evaluated and compared to a polymer-based cleaning sequence. Comparing the in-line data to typical swab and rinse tests of the process equipment indicated that inaccessible parts of the equipment were still contaminated after the polymer-based cleaning procedure, although no API was detected in the extrudate. Nevertheless, the novel solvent-based cleaning approach proved to be suitable for removing API residue from the majority of problematic equipment parts and can potentially enable a full API cleaning-in-place of a pharmaceutical extruder for the first time.

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“…Because high surface tension liquids and low surface energy solids rarely render intrinsic contact angles θ < 45° ( Fig. 1 B ), it is not surprising that liquids with medium-to-high surface tension such as water or mercury do not wet low surface energy materials, structured or not ( 10 – 20 ). Therefore, turning a nonwetting liquid/solid combination highly wetting is fundamentally significant.…”

mentioning

confidence: 99%

“…Our approach allows for a metastable hemiwicking state using surface reentrant structures, regardless of intrinsic wettabilities ( iii ). ( B ) Typical intrinsic contact angles for combinations of liquids of different surface tensions and solids with different surface energies with example references ( 10 – 20 ).…”

mentioning

confidence: 99%

Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids

Wilke

Song

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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We present a surface-engineering approach that turns all liquids highly wetting, including ultra-high surface tension fluids such as mercury. Previously, highly wetting behavior was only possible for intrinsically wetting liquid/material combinations through surface roughening to enable the so-called Wenzel and hemiwicking states, in which liquid fills the surface structures and causes a droplet to exhibit a low contact angle when contacting the surface. Here, we show that roughness made of reentrant structures allows for a metastable hemiwicking state even for nonwetting liquids. Our surface energy model reveals that with liquid filled in the structure, the reentrant feature creates a local energy barrier, which prevents liquid depletion from surface structures regardless of the intrinsic wettability. We experimentally demonstrated this concept with microfabricated reentrant channels. Notably, we show an apparent contact angle as low as 35° for mercury on structured silicon surfaces with fluorinated coatings, on which the intrinsic contact angle of mercury is 143°, turning a highly nonwetting liquid/material combination highly wetting through surface engineering. Our work enables highly wetting behavior for previously inaccessible material/liquid combinations and thus expands the design space for various thermofluidic applications.

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Contact Angle of Ethanol and n-Propanol Aqueous Solutions on Metal Surfaces

Cited by 25 publications

References 16 publications

Bubble point pressures of binary methanol/water mixtures in fine‐mesh screens

Bubble point pressures of binary methanol/water mixtures in fine‐mesh screens

Novel Cleaning-in-Place Strategies for Pharmaceutical Hot Melt Extrusion

Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids

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