Dynamic Response of AFM Cantilevers to Dissimilar Functionalized Silica Surfaces in Aqueous Electrolyte Solutions

Wu, Yan; Misra, Sambit; Karacor, M. Basar; Prakash, Shaurya; Shannon, Mark A.

doi:10.1021/la103005c

Cited by 20 publications

(22 citation statements)

References 38 publications

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“…The results indicate higher pH corresponds to a higher surface charge density and a lower drainage velocity [83].…”

Section: (E) Considerations For Slip Flowmentioning

confidence: 83%

“…Considering three important forces, electrostatic or coulombic, F el , van der Waals, F vdw , and hydrodynamic forces, F h , provides better insight to surface-particle interactions and subsequent phenomena. For an infinite flat surface separated by a distance D from a particle of radius R, F el is given by [83] …”

Section: Theory (A) Fluid Mechanics and Scaling Analyses For Microflumentioning

confidence: 99%

“…F vdw is given by [83] where A H is the Hamaker constant, which serves as an indicator of the interaction between the particle and the sample surface. F h is given by [83] …”

Section: Theory (A) Fluid Mechanics and Scaling Analyses For Microflumentioning

confidence: 99%

“…Figure 4c [83] shows the drainage velocity as a function of AFM tip-sample separation, comparing three different functionalized surfaces. Measurements of fluid drainage have been used in an indirect way to characterize the boundary-slip effect.…”

Section: (E) Considerations For Slip Flowmentioning

confidence: 99%

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Theory, fabrication and applications of microfluidic and nanofluidic biosensors

Prakash

Pinti

Bhushan

2012

Phil. Trans. R. Soc. A.

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Biosensors are a broad array of devices that detect the type and amount of a biological species or biomolecule. Several different types of biosensors have been developed that rely on changes to mechanical, chemical or electrical properties of the transduction or sensing element to induce a measurable signal. Often, a biosensor will integrate several functions or unit operations such as sample extraction, manipulation and detection on a single platform. This review begins with an overview of the current state-of-the-art biosensor field. Next, the review delves into a special class of biosensors that rely on microfluidics and nanofluidics by presenting the underlying theory, fabrication and several examples and applications of microfluidic and nanofluidic sensors.

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“…The results indicate higher pH corresponds to a higher surface charge density and a lower drainage velocity [83].…”

Section: (E) Considerations For Slip Flowmentioning

confidence: 83%

Section: Theory (A) Fluid Mechanics and Scaling Analyses For Microflumentioning

confidence: 99%

“…F vdw is given by [83] where A H is the Hamaker constant, which serves as an indicator of the interaction between the particle and the sample surface. F h is given by [83] …”

Section: Theory (A) Fluid Mechanics and Scaling Analyses For Microflumentioning

confidence: 99%

Section: (E) Considerations For Slip Flowmentioning

confidence: 99%

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Theory, fabrication and applications of microfluidic and nanofluidic biosensors

Prakash

Pinti

Bhushan

2012

Phil. Trans. R. Soc. A.

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“…Reproduced with permission from [38]. Consider the following statistics that present a sobering picture for the current state of −CH 3 1mM NaCl −Br 1mM NaCl The figure depicts experimental measurement of drainage velocity for chemically modified surfaces for a fluid draining between an AFM tip and the modified surfaces.…”

Section: Energy-efficient Water Purificationmentioning

confidence: 99%

Energy and Environmental Applications

Prakash¹,

Yeom²

2014

Nanofluidics and Microfluidics

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Slip Length Enhancement in Nanofluidic Flow using Nanotextured Superhydrophobic Surfaces

Heverhagen

Tasinkevych

Rahman

et al. 2016

Adv Materials Inter

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slippage at fl at, hydrophobic interfaces ( b Ӎ 10 nm). [ 7,8 ] This lack of interfacial slippage greatly reduces fl ow rates in nanofl uidic channels thereby limiting their effi ciency for energy conversion and solute separation. A promising approach to further increase slip, particularly in slit-shaped nanoscale channels, relies on textured hydrophobic surfaces and their ability to effectively trap air when immersed in water. [ 9 ] The air layer provides both "superhydrophobicity" [ 9 ] (i.e., extreme water repellency) and a shear-free interface that greatly reduces fl uid drag [ 10 ] (shown schematically in Figure 1 ). However, conventional microtextured superhydrophobic (SH) surfaces suffer from intrinsic shortcomings that greatly limit their use in nanofl uidic applications. The most serious problem is the collapse of the air layer trapped within the texture [ 11 ] at the relatively high pressures (>1 atm) [ 12 ] required to drive the liquid fl ow in nanofl uidic devices. Although, as shown recently, [ 13,14 ] the resilience of a SH surface to water infi ltration can be improved through reducing the pattern period L to ≈10 nm, in principle this may be detrimental to slippage since theoretically b Ӎ L . [ 7 ] Nevertheless, the dependence of slippage on L has been tested only in textures with micron-scale features ( L Ӎ 1 µm), [ 15 ] and the effect of nanometer sized textures is still largely unexplored.Another long standing question is whether SH surfaces bear electric charge (shown schematically in Figure 1 ), and whether such charge may contribute to enhancing the electroosmotic fl ow, [ 16 ] or enable devices for effi cient electrokinetic energy conversion. [ 17 ] There is also no experimental consensus concerning the magnitude and even the sign of the charge accumulating at the air-water interface. [ 18 ] A recent study of colloidal electrophoresis near a SH surface reported no enhancement of electroosmotic mobility. [ 19 ] However, the surface zeta potential could not be measured due to the high interfacial roughness and the study could not conclusively assign the results to the lack of surface charge.Here we show experimentally that signifi cant interfacial drag reduction in nanoscale, slit-like channels can be obtained with hydrophobic arrays of conical textures tapering to a radius of less than 10 nanometers at their tip. Results and DiscussionWe fabricate large-area (cm 2 ) silicon surfaces containing features with uniform size and spacing on a length scale The development of highly effi cient nanofl uidic devices necessitates means for enhancing and controlling fl uid transport under confi nement. Here, it is shown experimentally that signifi cant interfacial drag reduction in nanoscale channels can be obtained with hydrophobic arrays of conical textures tapering to a radius of less than 10 nanometers at their tip. This geometry maximizes interfacial slippage by trapping a highly resilient air layer at the solid/liquid interface. Further, it is revealed that the composite liquid/solidair interface b...

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Dynamic Response of AFM Cantilevers to Dissimilar Functionalized Silica Surfaces in Aqueous Electrolyte Solutions

Cited by 20 publications

References 38 publications

Theory, fabrication and applications of microfluidic and nanofluidic biosensors

Theory, fabrication and applications of microfluidic and nanofluidic biosensors

Energy and Environmental Applications

Slip Length Enhancement in Nanofluidic Flow using Nanotextured Superhydrophobic Surfaces

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