Porous Thin Films Based on Photo-Cross-Linked Star-Shaped Poly(<scp>d</scp>,<scp>l</scp>-lactide)s

Karikari, Afia S.; Williams, Sharlene R.; Heisey, Cheryl L.; Rawlett, Adam M.; Long, Timothy Edward

doi:10.1021/la0603020

Cited by 55 publications

(47 citation statements)

References 54 publications

(100 reference statements)

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“…The formation of hierarchically-ordered arrays in polymer fibers is of interest because of potential applications in photonic band-gap materials, sensors, and patterned light-emitting diodes [160][161][162][163][164]. These patterned arrays also increase the roughness of the material, which, according to the Cassie-Baxter law, affects the wettability or water contact angle of the surface because it is governed by both the surface energy and roughness [165].…”

Section: Nanoporesmentioning

confidence: 99%

Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

120

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Abstract:Traditional electrospun nanofibers have a myriad of applications ranging from scaffolds for tissue engineering to components of biosensors and energy harvesting devices. The generally smooth one-dimensional structure of the fibers has stood as a limitation to several interesting novel applications. Control of fiber diameter, porosity and collector geometry will be briefly discussed, as will more traditional methods for controlling fiber morphology and fiber mat architecture. The remainder of the review will focus on new techniques to prepare hierarchically structured fibers. Fibers with hierarchical primary structures-including helical, buckled, and beads-on-a-string fibers, as well as fibers with secondary structures, such as nanopores, nanopillars, nanorods, and internally structured fibers and their applications-will be discussed. These new materials with helical/buckled morphology are expected to possess unique optical and mechanical properties with possible applications for negative refractive index materials, highly stretchable/high-tensile-strength materials, and components in microelectromechanical devices. Core-shell type fibers enable a much wider variety of materials to be electrospun and are expected to be widely applied in the sensing, drug delivery/controlled release fields, and in the encapsulation of live cells for biological applications. Materials with a hierarchical secondary structure are expected to provide new superhydrophobic and self-cleaning materials.

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Section: Nanoporesmentioning

confidence: 99%

Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

120

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“…A linear relationship was found between RH and average pore dimensions. 202 Tian et al investigated the compatibility of 7 different solvents with poly(phenylene oxide) and PLGA polymers for the formation of honeycomb structures and the influence of the solvent boiling points on the regularity of the patterns. It was found that the volatility of the solvent is not only responsible for the regularity of the porous structure but also influences the pore sizes of the honeycomb films.…”

Section: Breath Figures Patterning Using Polylactic Acid Derivativesmentioning

confidence: 99%

Droplet condensation on polymer surfaces: A review

UÇAR¹

2013

Turk J Chem

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A novel root inclusion net method was designed to determine the fine root productions and turnover rates of 13-, 22-, and 38-year-old Larix principis-rupprechtii plantations in the whole growing season of 2012, and it was compared with the results of the sequential coring method and in-growth core method. All following values are reported in order for 13-, 22-, and 38-year-old L. principis-rupprechtii plantations. The mean values of fine root biomasses were 103, 261, and 356 g m -2 , about 76-78% of which were live fine root biomasses. The fine root productions were 86-118 g m -2 year -1 , 124-138 g m -2 year -1 , and 134-160 g m -2 year -1 , respectively. The fine root turnover rates were 1.12, 0.61, and 0.51 times year -1 , respectively, suggesting a relative slow fine root turnover in L. principisrupprechtii plantations. The carbon inputs into soil accompanying fine root turnover were 52, 58, and 94 g C m -2 year -1 . This organic carbon is a sizeable pool in the forest ecosystem. The results suggest that our new modified root inclusion net method is suitable for field-based assessment of fine root production and turnover.

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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.…”

mentioning

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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Porous Thin Films Based on Photo-Cross-Linked Star-Shaped Poly(d,l-lactide)s

Cited by 55 publications

References 54 publications

Hierarchically Structured Electrospun Fibers

Hierarchically Structured Electrospun Fibers

Droplet condensation on polymer surfaces: A review

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

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