High-aspect ratio polymeric pillar arrays formed via electrohydrodynamic patterning

Dickey, Michael D.; Raines, Allen; Collister, Elizabeth; Bonnecaze, Roger T.; Sreenivasan, Sameet; Willson, C. Grant

doi:10.1007/s10853-007-2086-8

Cited by 26 publications

(23 citation statements)

References 19 publications

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“…Block copolymers62 and crystalline polymers59 have also been employed in EHP so that the micrometer‐scale order imposed by EHP directs their intrinsic, nanometer‐scale structure. EHP is not necessarily limited to polymers; Dickey et al made EHP structures with photopolymerizable liquids so that the room‐temperature pillar formation process occurred in <1 s, much faster than anything previously reported 70, 71…”

Section: Electrohydrodynamic Patterningmentioning

confidence: 99%

Directing convection to pattern thin polymer films

Janes

Katzenstein

Shanmuganathan

et al. 2013

J Polym Sci B Polym Phys

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Convection can be harnessed in elegant ways to pattern surfaces, often using uncomplicated equipment and materials, providing an interesting platform for future technological developments in thin film topographic assemblies. This manuscript contains a brief review of thin polymer film patterning methods that rely on directing convection, such as ''coffee ring'' patterning, lithographically induced self-assembly, and electrohydrodynamic patterning. These techniques are described in the context of a recent approach explored in our group for generating topographic patterns by photochemically directing Marangoni flow in thin polymer films with subtle gradients in surface energy. Aspects unique to this process are highlighted so that they may facilitate new developments in manufacturing technologically impactful patterned surfaces. For example, the features produced by photochemically directed Marangoni-driven flow are preprogrammed in the solid state, thermally developed and can be formed in multilayer films.

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Section: Electrohydrodynamic Patterningmentioning

confidence: 99%

Directing convection to pattern thin polymer films

Janes

Katzenstein

Shanmuganathan

et al. 2013

J Polym Sci B Polym Phys

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“…This is probably a signature of small lateral variations of the electric field, introduced by slight variations in the plate spacing [4]. We conclude that the precise electrode adjustment and control of the air gap and capacitor plate distances for larger areas requires a more sophisticated experimental setup than used here, for example, where a gap monitoring scheme is used to fix the electrodes at a constant distance and parallel to each other [22]. In addition, the strong dependence of the developing (Figure 3(d)).…”

Section: Resultsmentioning

confidence: 97%

Challenges Found When Patterning Semiconducting Polymers with Electric Fields for Organic Solar Cell Applications

Castro

Nüesch

Walder

et al. 2012

Journal of Nanomaterials

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A material-independent, contactless structuring method of semiconducting organic materials for the fabrication of interface-enhanced bilayer solar cells is not available so far. Patterning of thin films using electrohydrodynamic instabilities possesses many desired characteristics and has convincingly been used as a simple method to structure and replicate patterns of nonconducting polymers on submicrometer length scales. However, the applicability of this technique to a wider range of materials has not been demonstrated yet. Here, we report attempts to structure poly(p-phenylene vinylene) in a similar way. We found that thin films of poly(2-methoxy-5-(2′-ethylhexyl-oxy)-1,4-phenylene-vinylene) (MEH-PPV) and poly(2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene-vinylene) (MDMO-PPV) could not be destabilized at all in the limited accessible range of the experimental parameters set by the delicate chemical nature of these materials. We discuss failure origins and present possible loopholes for the patterning of semiconducting polymers using electric fields.

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“…[167b] Polymeric microlens can also be fabricated for optical devices . The resolution of the patterns obtained with electric‐field instability is limited due to the dielectric breakdown 167a,186. The increase in surface area obtained by patterning can be used to facilitate the charged based data storage.…”

Section: Surface Modification Through Patterningmentioning

confidence: 99%

“…Jacobs and Whitesides have fabricated patterned polymers which can be used for high‐density charge‐based data storage and high‐resolution charge‐based printing. [47a] A PDMS stamp was used supporting an 80 nm thick gold film and an 80 nm thick film of PMMA supported on n‐doped silicon. When a voltage pulse transfers charges between gold and the polymer electret, polymers were patterned with trapped charges at a resolution better than 150 nm in less than 20 s. Yang et al have shown that a hysteresis phenomenon is observed between the voltage and the structure height (Figure c).…”

Section: Surface Modification Through Patterningmentioning

confidence: 99%

Surface Modification of Polymers: Methods and Applications

Nemani

Annavarapu

Mohammadian

et al. 2018

Adv Materials Inter

262

161

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Low cost, controlled crystallinity, chemical, and mechanical stability enable application of polymers in energy, water, electronics, and biomedical industries. Recent studies have shown that tailoring surface properties of polymers impacts their durability and functionality in these applications. However, the functionality and performance of polymer‐based devices and systems are greatly affected by the modification method and the process parameters, highlighting the need for understanding these methods and their mechanisms of operation in detail. The selection of the modification method invariably decides the properties enhanced in the polymer. In this review, various polymer surface modification treatments are discussed. These methods are categorized into physical, chemical, thermal, and optical ways, while illustrating their advantages and disadvantages. This review also explores the surface modification of polymers by patterning which encompasses one or more surface treatment methods. An application‐oriented study is presented discussing the relative importance of a method pertaining to a specific field of end‐application.

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High-aspect ratio polymeric pillar arrays formed via electrohydrodynamic patterning

Cited by 26 publications

References 19 publications

Directing convection to pattern thin polymer films

Directing convection to pattern thin polymer films

Challenges Found When Patterning Semiconducting Polymers with Electric Fields for Organic Solar Cell Applications

Surface Modification of Polymers: Methods and Applications

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