Simple Fabrication of Honeycomb- and Pincushion-Structured Films Containing Thermoresponsive Polymers and Their Surface Wettability

Yabu, Hiroshi; Hirai, Yuji; Kojima, Misaki; Shimomura, Masatsugu

doi:10.1021/cm803476m

Cited by 69 publications

(44 citation statements)

References 36 publications

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“…In contrast, the strategy that directly employs stimuli-responsive polymer to fabricate honeycomb fi lm with smart surface is more preferred due to its simplicity and effi ciency. [ 16,17,19,20 ] In this case, the hydrophilic sensitive groups concentrate on the inner surfaces of the pores or further form nanophase structures inside the walls of the honeycomb fi lms, thereby conferring the fi lms tunable surfaces wettability. [ 16,19 ] For instance, Hu and co-workers reported the fi rst pH-responsive honeycomb fi lm by polystyrene-b -polyacrylic acid (PS-b -PAA) self-assembly.…”

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“…[ 16,17,19,20 ] In this case, the hydrophilic sensitive groups concentrate on the inner surfaces of the pores or further form nanophase structures inside the walls of the honeycomb fi lms, thereby conferring the fi lms tunable surfaces wettability. [ 16,19 ] For instance, Hu and co-workers reported the fi rst pH-responsive honeycomb fi lm by polystyrene-b -polyacrylic acid (PS-b -PAA) self-assembly. [ 17 ] The water contact angle (CA) of the original fi lm with 1.5 µm pore diameter is 96°, while it increases to 120° after the treatment with an acid aqueous solution (pH 4.0), it sharply decreases to 10° after the treatment of a base aqueous solution (pH 10.0), ascribing to the protonation of carboxylic acid groups that leads to an increase of hydrophilicity.…”

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confidence: 99%

“…[ 13,16,17 ] Generally, honeycomb fi lm surface exhibits hydrophobic characteristics derived from the hydrophobic polymer and the presence of micron-sized holes which is similar to the "lotus-effect" of plant leaves. [ 13,18 ] Considering the special morphology of honeycomb fi lms, introduction of stimuli-responsive groups on fi lm surface makes it an appropriate way to realize the adjustment of surface wettability since the reversible physical properties change can be easily achieved upon exposure to external stimulation.…”

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CO₂‐Induced Tunable and Reversible Surface Wettability of Honeycomb Structured Porous Films for Cell Adhesion

Yin

Bulteau

Feng

et al. 2016

Adv Materials Inter

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of developing different polymers to fabricate honeycomb fi lms with different surface wettability. The reversible control of wettability enables fi lms to be recycled and reused, as a result, the production cost will be largely reduced. Moreover, adjustable wettability of interfacial materials has versatile potentials in many applications, such as controlled drug delivery, cells capture and release, and oil/water separation, in which wettability acts as a switch. [ 15 ] Therefore, development of honeycomb fi lms with tunable and reversible surface wettability is of great importance for both fundamental research and practical applications.Wettability is largely dependent on surface structure and chemical composition of the materials. [ 13,16,17 ] Generally, honeycomb fi lm surface exhibits hydrophobic characteristics derived from the hydrophobic polymer and the presence of micron-sized holes which is similar to the "lotus-effect" of plant leaves. [ 13,18 ] Considering the special morphology of honeycomb fi lms, introduction of stimuli-responsive groups on fi lm surface makes it an appropriate way to realize the adjustment of surface wettability since the reversible physical properties change can be easily achieved upon exposure to external stimulation. Hence, two approaches have been developed to introduce sensitive groups on honeycomb fi lm surface. One is based on the strategy of posttreatment on an as-prepared fi lm. [ 1,5,13 ] That is, to prepare a normal honeycomb fi lm fi rst and then stimuli-responsive moieties are introduced by further surface modifi cation. For example, Stenzel and co-workers prepared the fi rst example of thermoresponsive honeycomb structured porous polymer fi lm by grafting poly( N -isopropylacrylamide) (PNIPAAm) onto a honeycomb fi lm via reversible additionfragmentation transfer polymerization. [ 13 ] The modifi ed fi lm surface changes from hydrophobic to hydrophilic when temperature declines from 45 to 25 °C. However, postmodifi cation on honeycomb fi lm is, in fact, rather complicated, usually including several steps. In contrast, the strategy that directly employs stimuli-responsive polymer to fabricate honeycomb fi lm with smart surface is more preferred due to its simplicity and effi ciency. [ 16,17,19,20 ] In this case, the hydrophilic sensitive groups concentrate on the inner surfaces of the pores or further form nanophase structures inside the walls of the honeycomb fi lms, thereby conferring the fi lms tunable surfaces wettability. [ 16,19 ] For instance, Hu and co-workers reported the fi rst pH-responsive honeycomb fi lm by polystyrene-b -polyacrylic acid (PS-b -PAA) self-assembly. [ 17 ] The water contact angle (CA) of the original fi lm with 1.5 µm pore diameter is 96°, while it increases to 120° after the treatment with an acid aqueous solution (pH 4.0), it sharply decreases to 10° after the treatment of a base aqueous solution (pH 10.0), ascribing to the protonation of carboxylic acid groups that leads to an increase of hydrophilicity. Later, Billon and co-workers [ 19...

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CO₂‐Induced Tunable and Reversible Surface Wettability of Honeycomb Structured Porous Films for Cell Adhesion

Yin

Bulteau

Feng

et al. 2016

Adv Materials Inter

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“…17 These pincushion-structured surfaces show thermalresponsive wettability from hydrophobic to superhydrophobic. 18 In contrast to these, the BCP used here self-assembles into a nanostructured lamellar surface and provides temperature-dependent wettability.…”

Section: Resultsmentioning

confidence: 99%

Temperature-controlled directional spreading of water on a surface with high hysteresis

et al. 2013

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The actuation of microscale liquid droplets is a key point in the lab-on-chip field. Marangoni force actuation resulting from a temperature gradient has remarkable advantages. However, high hysteresis between the droplet and the surface is an obstacle to this motion. Here, we take advantage of the temperature-responsive wettability of a surface made of a block copolymer (BCP) to show the temperature-controlled directional spreading of water droplets. By applying a temperature gradient on the BCP surface, both the topologies and chemical components in the nanodomains could be changed gradually. As a result, a wettability gradient force would form with the same direction as the Marangoni force, which could also be formed due to the same temperature gradient, and the collaborative effect of these forces could help overcome the high hysteresis. This was confirmed theoretically by calculating the total force acting on the droplet. The liquid droplet was observed to move by forces of non-mechanical origin in experiments conducted using a thermal gradient on the BCP films. Furthermore, two water droplets were observed to merge into one when they were placed in a V-shaped temperature field. These results help us understand the motion of droplets on a surface with high hysteresis and provide potential applications in microfluidic devices.

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“…In contrast, chemical processes are rather quick. For example, water-assisted honeycomb pattern formation was reported by Shimomura and co-workers [6][7][8][9][10]. Water droplets were spontaneously assembled on the polymer solution, and honeycomb structure was formed on the substrate under high humidity conditions.…”

Section: Introductionmentioning

confidence: 94%

Dimple Morphology Formation on Non-woven Fabric by Fluorinated Polymers for Tunable Surface Wettability

Sakae

Kimoto

Watanabe

et al. 2014

Trans. Mat. Res. Soc. Japan

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In this paper, we report the synthesis of two fluorinated block-copolymers, namely, poly(TFEMA-co-BMA) (PFB) and poly(HFIMA-co-BMA) (PHFB) using radical polymerization. We studied their ability to function as water-repellent surface coatings using non-woven fabric as substrate by forming dimple morphology on the fabric surface. The compositions of PFB and PHFB were determined using 1 H NMR, gel permeation chromatography (GPC), and IR spectroscopy analyses. The dimple morphology was obtained from the fluorinated polymer on non-woven fabric by drop coating in a high-humidity environment, through self-organization. Initially, water droplets were assembled on the coating solution and dried by evaporation of different solvents such as methylene chloride and chloroform. Eventually, a template of dimple morphology was formed on the non-woven fabric. The morphology can be easily tuned, for example, by choice of organic solvent, concentration, and humidity (flow rate of water vapor). The dimple morphology was observed using scanning electron microscopy (SEM). The diameters of the dimples, PFB and PHFB, were roughly 0.63 µm and 2.5 µm, respectively. The wettability on the surface was characterized using static contact angle measurements.

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Simple Fabrication of Honeycomb- and Pincushion-Structured Films Containing Thermoresponsive Polymers and Their Surface Wettability

Cited by 69 publications

References 36 publications

CO₂‐Induced Tunable and Reversible Surface Wettability of Honeycomb Structured Porous Films for Cell Adhesion

CO₂‐Induced Tunable and Reversible Surface Wettability of Honeycomb Structured Porous Films for Cell Adhesion

Temperature-controlled directional spreading of water on a surface with high hysteresis

Dimple Morphology Formation on Non-woven Fabric by Fluorinated Polymers for Tunable Surface Wettability

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Simple Fabrication of Honeycomb- and Pincushion-Structured Films Containing Thermoresponsive Polymers and Their Surface Wettability

Cited by 69 publications

References 36 publications

CO2‐Induced Tunable and Reversible Surface Wettability of Honeycomb Structured Porous Films for Cell Adhesion

CO2‐Induced Tunable and Reversible Surface Wettability of Honeycomb Structured Porous Films for Cell Adhesion

Temperature-controlled directional spreading of water on a surface with high hysteresis

Dimple Morphology Formation on Non-woven Fabric by Fluorinated Polymers for Tunable Surface Wettability

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Product

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CO₂‐Induced Tunable and Reversible Surface Wettability of Honeycomb Structured Porous Films for Cell Adhesion

CO₂‐Induced Tunable and Reversible Surface Wettability of Honeycomb Structured Porous Films for Cell Adhesion