Retention of Liquids Above Microporous Membranes

2003 ◽  
Vol 790 ◽  
Author(s):  
John Charkoudian ◽  
Volkmar Thom
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Surface Modification ◽  
High Throughput ◽  
Liquid Surface ◽  
Polymer Surface ◽  
Microporous Membranes ◽  
Droplet Spreading ◽  
Liquid Surface Tension ◽  
Multiwell Plates

ABSTRACTThe ability of membranes to retain fluids without leaking in devices such as high throughput multiwell plates was examined as a function of membrane polymer, surface modification, and liquid surface tension. Microporous membranes (200–800nm) act as arrays of millions of imperfect microcapillaries. Extrusion and leaking requires pressure plus coalescence of microdroplets. For unmodified membranes, the liquid hold up height (pressure) is critically dependent on liquid surface tension, rising rapidly when the contact angle prevents droplet spreading and coalescence. Topography, as measured by AFM, also plays a role in ease of coalescence. Surface modification has a large impact on hold up pressure and its dependence on liquid surface tension.

scholarly journals Simultaneous measurement of liquid surface tension and contact angle by light reflection

2019 ◽  
Vol 27 (12) ◽  
pp. 16703 ◽  
Author(s):  
Daobin Luo ◽  
Lailai Qian ◽  
Liangwei Dong ◽  
Peng Shao ◽  
Zongmin Yue ◽  
...  
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Simultaneous Measurement ◽  
Liquid Surface ◽  
Light Reflection ◽  
Liquid Surface Tension

A New Method for Measuring Contact Angle and Liquid Surface Tension Applying Detachment of Two-Dimensional Meniscus

1998 ◽  
Vol 202 (1) ◽  
pp. 54-62 ◽  
Author(s):  
Kenji Katoh ◽  
Yu Tsao ◽  
Masayoshi Yamamoto ◽  
Tsuneo Azuma ◽  
Hideomi Fujita
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Liquid Surface ◽  
New Method ◽  
Two Dimensional ◽  
Liquid Surface Tension

scholarly journals Characterizing surface wetting and interfacial properties using enhanced sampling (SWIPES)

Soft Matter ◽  
2019 ◽  
Vol 15 (5) ◽  
pp. 860-869 ◽  
Author(s):  
Hao Jiang ◽  
Suruchi Fialoke ◽  
Zachariah Vicars ◽  
Amish J. Patel
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Solid Surface ◽  
Efficient Method ◽  
Liquid Surface ◽  
Liquid Droplet ◽  
Interfacial Properties ◽  
Enhanced Sampling ◽  
Surface Wetting ◽  
Liquid Surface Tension

We introduce an accurate and efficient method for characterizing surface wetting and interfacial properties, such as the contact angle made by a liquid droplet on a solid surface, and the vapor–liquid surface tension of a fluid.

Surface Wettability Through Asymptotic Contact Angle

2009 ◽  
Author(s):  
Saeid Vafaei ◽  
Dongsheng Wen ◽  
Ganapathiraman Ramanath ◽  
Theodorian Borca-Tasciuc
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Bismuth Telluride ◽  
Liquid Surface ◽  
Normal Component ◽  
Contact Angles ◽  
Surface Wettability ◽  
Spherical Droplet ◽  
Droplet Shape ◽  
Liquid Surface Tension

The purpose of this investigation is to find a unique and accurate criterion to measure surface wettability. The asymptotic contact angle (droplet contact angle in no gravity condition), which is independent of droplet size, is used to identify the surface wettability in this work. The asymptotic contact angle is calculated by equating the normal component of interfacial force on an axisymmetric droplet and spherical droplet. The effect of 2.5 nm bismuth telluride nanoparticles on surface wettability is measured and evaluated by asymptotic contact angles as a sample. This paper also studies the effects of nanoparticles on solid, gas and liquid interactions at the triple line as well as the gas-liquid surface tension of aqueous solutions of 2.5 nm bismuth telluride nanoparticles functionalized with thioglycolic acid. Experimental measurements of nanofluid droplet shapes show that the contact angle strongly depends on nanoparticle concentrations. Fitting the droplet shape with predictions of the Laplace-Young equation, the nanofluid gas-liquid surface tension is determined.

scholarly journals Trickle/pulse flow regime transition in downflow packed tower involving foaming liquids

2012 ◽  
Vol 18 (3) ◽  
pp. 349-359
Author(s):  
Vijay Sodhi
Keyword(s):  
Surface Tension ◽  
Liquid Flow ◽  
Liquid Surface ◽  
Regime Transition ◽  
Pulse Flow ◽  
Packed Tower ◽  
Flow Rates ◽  
Transition Boundary ◽  
Liquid Surface Tension ◽  
Pulsing Flow

The most of past studies in foaming trickle bed reactors aimed at the improvement of efficiency and operational parameters leads to high economic advantages. Conventionally most of the industries rely on frequently used gas continuous flow (GCF) where operational output is satisfactory but not yields efficiently as in pulsing flow (PF) and foaming pulsing flow (FPF). Hydrodynamic characteristics like regime transitions are significantly influenced by foaming nature of liquid as well as gas and liquid flow rates. This study?s aim was to demonstrate experimentally the effects of liquid flow rate, gas flow rates and liquid surface tension on regime transition. These parameters were analyzed for the air-aqueous Sodium Lauryl Sulphate and air-water systems. More than 240 experiments were done to obtain the transition boundary for trickle flow (GCF) to foaming pulsing flow (PF/FPF) by use excessive foaming 15-60 ppm surfactant compositions. The trickle to pulse flow transition appeared at lower gas and liquid flow rates with decrease in liquid surface tension. All experimental data had been collected and drawn in the form of four different transitional plots which are compared and drawn by using flow coordinates proposed by different researchers. A prominent decrease in dynamic liquid saturation was observed especially during regime transitional change. The reactor two phase pressure evident a sharp rise to verify the regime transition shift from GCF to PF/FPF. Present study reveals, the regime transition boundary significantly influenced by any change in hydrodynamic as well as physiochemical properties including surface tension.

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