More Fluorous Surface Modifier Makes it Less Oleophobic: Fluorinated Siloxane Copolymer/PDMS Coatings

Zhang, Wei; Zheng, Ying; Orsini, Lorenzo; Morelli, Andrea; Galli, Giancarlo; Chiellini, Emo; Carpenter, Everett E.; Wynne, Kenneth J.

doi:10.1021/la903770s

Cited by 25 publications

(27 citation statements)

References 25 publications

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“…Particularly, fluorinated surface hydrophobicity can effectively prevent charge trap (or trapping) formation by repelling H 2 O and O 2 species, thereby improving device operation under ambient air exposure or electrical stress conditions . However, a peculiar phase known as the “fluorous phase” can occur on excessively fluorinated surfaces; this phase is hard to mix with either polar or nonpolar hydrocarbon materials . In fluorous phases with a surface energy ( γ ) of below 30 mJ m −2 , it is difficult to control the ordered domains of organic semiconductors (which are mostly confined within the ultrathin channel layers (<5 nm) near the gate dielectrics) that function as transport paths of charge‐carriers …”

Section: Introductionmentioning

confidence: 99%

Balancing Surface Hydrophobicity and Polarizability of Fluorinated Dielectrics for Organic Field‐Effect Transistors with Excellent Gate‐Bias Stability and Mobility

Jang

Lee

Shin

et al. 2016

Adv Materials Inter

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It is demonstrated that treating dielectrics with fluorinated polymers, which have excellent hydrophobicity, chemical inertness, and the lowest polarizability, yields a semiconductor‐compatible surface energy and excellent charge detrapping characteristics. Fluorocopolymers, polystyrene‐random‐poly(2,3,4,5,6‐pentafluorostyrene) (PS‐r‐PPFS) copolymers with different 2,3,4,5,6‐pentafluorostyrene (PFS) loadings, are synthesized to modify a SiO2 gate dielectric using radical polymerization. Surface energy (γ) of the copolymer‐treated SiO2 dielectrics decreases from 40.7 to 24.0 mJ m−2 with increasing PFS mol% in the copolymer. Pentacene organic field‐effect transistors (OFETs) show field‐effect mobility (μFET) values ranging from 0.82 (for 0 mol% PFS) to 0.25 cm2 V−1 s−1 (for 100 mol% PFS). Enhancing the bias stress stability without affecting the μFET value is achieved via the introduction of a small mol% fluorocarbon segments onto the PS‐r‐PPFS backbone. 15 mol% PFS‐loaded fluorocopolymer‐coated SiO2 substrate yields a γ value of 35 mJ m−2, close to that (38 mJ m−2) of the lowest‐γ crystal surface of pentacene, and the corresponding OFETs have μFET values up to 0.81 cm2 V−1 s−1 and excellent gate‐bias stress stability in comparison to the rich fluorinated dielectric systems, which has degraded μFET values ranging from 0.2 to 0.4 cm2 V−1 s−1.

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Section: Introductionmentioning

confidence: 99%

Balancing Surface Hydrophobicity and Polarizability of Fluorinated Dielectrics for Organic Field‐Effect Transistors with Excellent Gate‐Bias Stability and Mobility

Jang

Lee

Shin

et al. 2016

Adv Materials Inter

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“…Similarly, polydimethylsiloxane (PDMS) based elastomers, typically Sylgard 184, are almost exclusively used as substrate materials for microfluidic devices, 11 properties, which are strongly operator dependent. Even under ideal conditions, the surface properties of PDMS devices are less than perfectly suited for fluorous phases, 12 and hence often require surface derivatization.…”

Section: Introductionmentioning

confidence: 99%

Droplet confinement and leakage: Causes, underlying effects, and amelioration strategies

2015

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The applicability of droplet-based microfluidic systems to many research fields stems from the fact that droplets are generally considered individual and selfcontained reaction vessels. This study demonstrates that, more often than not, the integrity of droplets is not complete, and depends on a range of factors including surfactant type and concentration, the micro-channel surface, droplet storage conditions, and the flow rates used to form and process droplets. Herein, a model microfluidic device is used for droplet generation and storage to allow the comparative study of forty-four different oil/surfactant conditions. Assessment of droplet stability under these conditions suggests a diversity of different droplet failure modes. These failure modes have been classified into families depending on the underlying effect, with both numerical and qualitative models being used to describe the causative effect and to provide practical solutions for droplet failure amelioration in microfluidic systems. V C 2015 AIP Publishing LLC.

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“…Another complication can arise under dynamic conditions such as thermal processing/crosslinking, during which fluorous functionality can be trapped in the bulk 32. Similarly, if present in a domain that is above T g , fluorinated moieties may undergo concentration‐dependent aggregation such that more fluorous modifier makes the surface less oleophobic 33…”

Section: Introductionmentioning

confidence: 99%

A Polyurethane Surface Modifier: Contrasting Amphiphilic and Contraphilic Surfaces Driven by Block and Random Soft Blocks Having Trifluoroethoxymethyl and PEG Side Chains

Zhang

Fujiwara

Taşkent

et al. 2012

Macro Chemistry & Physics

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A conventional MDI-BD-PTMO polyurethane was modified using 2 wt.% polyurethanes (U) having copolyoxetane soft blocks with hydrophobic 3F, CF3CH2OCH2- and hydrophilic MEn, CH3O(CH2CH2O)nCH2-, n = 3, 7) side chains. In contrast to neat 3F-co-MEn-U, 2 wt.% 3F-co-MEn-U compositions have physically stable morphologies and wetting behavior. Surface composition (XPS) and amphiphilic or contraphilic wetting are controlled by the 3F-co-MEn polyoxetane soft block architecture and MEn side chain length. Importantly, θrec can be tuned for 2 wt.% 3F-co-MEn-U compositions independent of swelling, which is controlled by the bulk polyurethane. AFM imaging led to a new morphological model whereby fluorous/PEG-hard block nano-aggregates combine to form near surface features culminating in micron scale texturing.

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More Fluorous Surface Modifier Makes it Less Oleophobic: Fluorinated Siloxane Copolymer/PDMS Coatings

Cited by 25 publications

References 25 publications

Balancing Surface Hydrophobicity and Polarizability of Fluorinated Dielectrics for Organic Field‐Effect Transistors with Excellent Gate‐Bias Stability and Mobility

Balancing Surface Hydrophobicity and Polarizability of Fluorinated Dielectrics for Organic Field‐Effect Transistors with Excellent Gate‐Bias Stability and Mobility

Droplet confinement and leakage: Causes, underlying effects, and amelioration strategies

A Polyurethane Surface Modifier: Contrasting Amphiphilic and Contraphilic Surfaces Driven by Block and Random Soft Blocks Having Trifluoroethoxymethyl and PEG Side Chains

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