Generating Aligned Micellar Nanowire Arrays by Dewetting of Micropatterned Surfaces

Glazer, Piotr J.; Bergen, Leo; Jennings, Laurence; Houtepen, Arjan J.; Mendes, Eduardo; Boukany, Pouyan E.

doi:10.1002/smll.201303414

Cited by 18 publications

(24 citation statements)

References 47 publications

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“…At the end of the outer edge almost all nanowires are directed perpendicular to the rolling direction. The "guided de-wetting" method, in which the nanowire containing solution is gently dragged along the micropatterned surface, was recently adopted to generate large arrays of amphiphilic nanowires from ultra-long selfassembled polystyrene-polyethylene oxide block-copolymer micelles [10]. The typical nanowire array is illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Affordable techniques for fabricating large array of functional nanowires: From DNA to micellar systems

Glazer

Warringa

Bergen

et al. 2015

2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

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Section: Resultsmentioning

confidence: 99%

“…During de-wetting, micro-features acted as wetting defects to hold the receding contact line locally. [10] Three different de-wetting approaches including spin stretching method, rolling droplet and guided de-wetting method are presented.…”

Section: Introductionmentioning

confidence: 99%

Affordable techniques for fabricating large array of functional nanowires: From DNA to micellar systems

Glazer

Warringa

Bergen

et al. 2015

2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

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“…The nanowires exhibit a smooth surface and uniform diameter along their entire length, and exceptionally high length/ diameter ratio (up to 5 × 10 5 ) in comparison with polymer nanostructures realized by other methods. [ 26,[30][31][32][33][34][35] These electrospun materials have been found to exhibit superior piezoelectric performance, [ 26,36 ] although their operation is not fully explained by traditional models. To evaluate the piezoelectric response under specifi c compressive loads, fl exible and thin Cu wires with a layer of silver epoxy are used to defi ne contacts to the ends of 9 mm long polymer nanobeams.…”

Section: Communicationmentioning

confidence: 99%

Shear Piezoelectricity in Poly(vinylidenefluoride‐co‐trifluoroethylene): Full Piezotensor Coefficients by Molecular Modeling, Biaxial Transverse Response, and Use in Suspended Energy‐Harvesting Nanostructures

et al. 2016

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Piezoelectric materials and associated nanostructures accumulate electrical charges on their surfaces in response to an applied mechanical stress, through the change in their spontaneous electric polarization. [1,2] Exploiting deformations induced by motion, mechanical vibrations, and environmental noise, [3,4] these systems are extremely attractive for energy harvesting in information and communications technologies and personalized electronics. [5][6][7] Solid-state materials such as crystals [8] and ceramics [9] have been integrated in complex networks for the internet of things [10] as actuators, sensors, and transducers, [11] and as switches in memory devices. Recently, the emerging of magnetoelectric data storage, [12] self-power sources for smart wearables [13] or implantable biomedical devices [14,15] fostered to conjugate mechanical energy harvesting with easy shaped, biocompatible flexible materials. [16,17] In particular, the request of bendable and stretchable systems can be fulfilled with elongated nanostructures (e.g. nanowires and nanotubes).In this framework, organics show an unequalled processing flexibility, lightweight, largearea and low-cost manufacturing methods, biocompatibility, and low acoustic and mechanical impedance, which make them ideal for underwater and medical applications. [14,15,18] For instance, copolymers of vinylidenefluoride (VDF, [CH 2 -CF 2 ] n ) with trifluoroethylene (TrFE), are stable and achieve a high degree of crystallinity (>90%). [19] In addition, they do not need to be poled because they directly crystallize from melt or solution into the ferroelectric (-) phase. Piezoelectricity in these materials is related to the electronegativity difference in hydrogen and fluorine atoms, which determines an effective dipole moment in the direction normal to the carbon backbone. Consequently, these films or nanostructures are often utilized with top/bottom contacts. [20][21][22][23] Instead, the special piezoelectric properties of polymers such as the poly(vinylidenefluoride-co-trifluoroethylene) [P(VDF-TrFE)] might lead to the development of much more versatile nanogenerator architectures. Differently from crystalline inorganic

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“…There is increased interest in DNA molecular behaviour near solid surfaces in micro/nanoscale geometries, as well as DNA stretching and deposition onto a solid substrate. 41,83 We anticipate that local polymer conformation near the interface and bulk can play a crucial role in the fluid dynamics and nonlinear rheological properties of polymer solutions. 84 We believe that these single molecule experiments can provide more insights into a realistic theoretical picture of polymer flow (with different architectures and levels of entanglement) near solid surfaces (with different surface properties), which allows us to optimize these stretching processes more efficiently.…”

Section: -11mentioning

confidence: 99%

“…In polymer processing and micro/nano-fluidics, wall slip can be beneficial and economically viable because (i) it reduces the required force/pressure to transport polymeric fluids in flow devices (in particular for pressure driven transport in nanofluidics), 9,38,39 (ii) it optimizes the liquid transport by electro-osmotic flow in micro/nano-fluidic systems, 39,40 (iii) it forms a thin layer of high shear zone next to the wall surface, which can align and stretch tethered chains for molecular electronics and sensing applications, 37,41 and (iv) it postpones the shark-skin and melt fracture during extrusion to higher flow rates, which allows the production of smoother and glossier polymeric products. 9,38 However, slip is always detrimental during rheometric measurements because it leads to large errors and flow discontinuity across the sample thickness due to illposedness at the boundary and hence complicates the analysis of fluid systems.…”

Section: Introductionmentioning

confidence: 99%

Microscopic origin of wall slip during flow of an entangled DNA solution in microfluidics: Flow induced chain stretching versus chain desorption

Hemminger

Boukany

2017

Biomicrofluidics

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Despite the relevance and importance of slip, a fundamental understanding of the underlying molecular mechanisms of wall slip in polymer flow is still missing. In this work, we investigate the slip behavior of an entangled DNA solution at a molecular scale using a confocal microscope coupled to a microfluidic device. From microscopic measurement, we obtain both the velocity profile and conformation of polymeric chains by visualizing DNA molecules during flow on various surfaces (ranging from weak to strong interactions with DNA molecules). In channel flow at a low Weissenberg number (Wi = 0.14), we observe a parabolic flow for an APTES-treated glass (with strong interaction with DNA) in the absence of slip, while a significant amount of slip has been observed for a regular glass (with a weak interaction with DNA). At higher flow rates (Wi > 1.0), strong slip appears during flow on APTES-treated surfaces. In this case, only immobile DNA molecules are stretched on the surface and other bulk chains remain coiled. This observation suggests that the flow induced chain stretching at the interface is the main mechanism of slip during flow on strong surfaces. Conversely, for slip flow on surfaces with weak interactions (such as unmodified or acrylate-modified glasses), polymeric chains are desorbed from the surface and a thin layer of water is present near the surface, which induces an effective slip during flow. By imaging DNA conformations during both channel and shear flows on different surfaces, we elucidate that either chain desorption or flow-induced stretching of adsorbed chains occurs depending on the surface condition. In general, we expect that these new insights into the slip phenomenon will be useful for studying the biological flow involving single DNA molecule experiments in micro/nanofluidic devices.

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Generating Aligned Micellar Nanowire Arrays by Dewetting of Micropatterned Surfaces

Cited by 18 publications

References 47 publications

Affordable techniques for fabricating large array of functional nanowires: From DNA to micellar systems

Affordable techniques for fabricating large array of functional nanowires: From DNA to micellar systems

Shear Piezoelectricity in Poly(vinylidenefluoride‐co‐trifluoroethylene): Full Piezotensor Coefficients by Molecular Modeling, Biaxial Transverse Response, and Use in Suspended Energy‐Harvesting Nanostructures

Microscopic origin of wall slip during flow of an entangled DNA solution in microfluidics: Flow induced chain stretching versus chain desorption

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