Porous Polymer Films and Honeycomb Structures Based on Amphiphilic Dendronized Block Copolymers

Cui, Cheng; Tian, Ye; Shi, Yanqiao; Tang, Rupei; Xi, Fu

doi:10.1021/la050187d

Cited by 149 publications

(126 citation statements)

References 42 publications

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“…[12][13][14][15] A variety of polymers and block polymers such as polystyrene (PS), a-D-glucose, b-cyclodextrin and cellulose derivatives, dendronized polymethacrylate block polymer, and linear poly(ethylene oxide) block polymer have been used to fabricate such films. [16][17][18] Nanoparticles, such as gold, silver, and CdSe, are added into the porous films for different applications. [19][20][21] In this work, a porous polymer film was used as a template to guide the patterning of proteins and a 3D pattern of proteins was achieved.…”

mentioning

confidence: 99%

Micropatterning of Proteins on 3D Porous Polymer Film Fabricated by Using the Breath‐Figure Method

Zhang¹,

Wang²

2007

Advanced Materials

131

135

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Micropatterning of proteins provides a power tool for studying the interactions between proteins, antibodies, and other biomolecules, [1,2] which can find applications in many fields such as biology, biosensor technology, biomedical devices, and tissue engineering. [3][4][5] Most micropatterning techniques are based on conventional photoresist lithography, soft lithography, and pin spotting. [6][7][8][9][10] Both photoresist-lithography and pin-spotting techniques require high-tech equipment such as mask aligners, electron (e)-beam writers, or pin spotters, and well-trained people to operate them. Conversely, soft lithography uses a polydimethylsiloxane (PDMS) stamp or stencil as a template to create a pattern of proteins or cells on the substrate, which is more convenient.[11] However, fabrication of a PDMS stamp or stencil still relies on photolithography. Furthermore, for most of the work carried out so far, 2D patterns of proteins were generated by using soft-lithography techniques on substrates with planar surfaces. Very recently it has been reported that porous polymer films with well-ordered honeycomb structures can be prepared by using a breath-figure method, a templating method based on evaporative cooling and subsequent water-droplet templating to form an ordered array of breath figures. [12][13][14][15] A variety of polymers and block polymers such as polystyrene (PS), a-D-glucose, b-cyclodextrin and cellulose derivatives, dendronized polymethacrylate block polymer, and linear poly(ethylene oxide) block polymer have been used to fabricate such films. [16][17][18] Nanoparticles, such as gold, silver, and CdSe, are added into the porous films for different applications. [19][20][21] In this work, a porous polymer film was used as a template to guide the patterning of proteins and a 3D pattern of proteins was achieved. A big challenge was how to attach proteins to the designated regions of the polymer film, because most of the polymers used in the breath-figure method are hydrophobic and do not have functional chemical groups for conjugating proteins.A schematic drawing is given in Figure 1 to show how proteins can be patterned by using the porous film as the template. PS and a small amount of amino-terminated PS (PS-mNH 2 ) were dissolved in chloroform. The mixed polymer solution was spread on a glass slide to form a film. PS-mNH 2 is an amphiphilic linear polymer, bearing a hydrophilic amino group at one end and a long hydrophobic alkyl group at the other end, which could be used as a surfactant to be self-assembled at the interfaces between water droplets and waterimmiscible PS solution. During the formation of breath figures, the hydrophobic alkyl group of the amphiphilic PS-mNH 2 was oriented towards the hydrophobic phase (PS) in the solution and the hydrophilic amino group was oriented towards the water droplet. After the water droplets were removed, pores were formed with an amino-terminated pore surface. The surface property of the pores in such a film was different from that of a pure PS film whe...

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mentioning

confidence: 99%

Micropatterning of Proteins on 3D Porous Polymer Film Fabricated by Using the Breath‐Figure Method

Zhang¹,

Wang²

2007

Advanced Materials

131

135

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“…Furthermore, various micro structures such as pincushion structures, 10 microsphere arrays 11 and so on were fabricated based on secondary processing of the honeycomb-patterned films. Wide variety of materials, including block copolymers, [12][13][14][15] star polymers, [16][17][18] dendrimers 19 can be used to prepare the honeycomb-patterned films. Amphiphilic copolymers (polyacrylamide, 20 polyion complex 21 ) are suitable polymers for preparation of the honeycomb-patterned films.…”

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confidence: 99%

The Effects of Interfacial Tensions of Amphiphilic Copolymers on Honeycomb-Patterned Films

et al. 2009

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A honeycomb-patterned film is formed by casting a polymer solution of polystyrene and amphiphilic copolymer under humid condition. Amphiphilic copolymers stabilize condensed water droplets as temporal templates. Therefore, physical properties of the amphiphilic copolymer are important factors for stability of condensed water droplets and the structure of the honeycomb-patterned film. In order to verify the effect of the interfacial tension between water and chloroform solution of the amphiphilic copolymer, which is one of the important physical properties, amphiphilic copolymers were synthesized from hydrophobic monomer and hydrophilic monomer at various copolymerization ratios. The interfacial tension decreased with increasing the copolymerization ratio of the hydrophilic comonomer. Uniformity of micropores of the honeycomb-patterned film increased with decreasing the value of the interfacial tension. Moreover, polymer frame of honeycomb-patterned film became thinner with decreasing the value of the interfacial tension. These results indicate that the structure of honeycombpatterned film can be controlled by the interfacial tension between water and polymer solution.

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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: 93%

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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Porous Polymer Films and Honeycomb Structures Based on Amphiphilic Dendronized Block Copolymers

Cited by 149 publications

References 42 publications

Micropatterning of Proteins on 3D Porous Polymer Film Fabricated by Using the Breath‐Figure Method

Micropatterning of Proteins on 3D Porous Polymer Film Fabricated by Using the Breath‐Figure Method

The Effects of Interfacial Tensions of Amphiphilic Copolymers on Honeycomb-Patterned Films

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

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