Nanoporous materials from stable and metastable structures of 1,2-PB-b-PDMS block copolymers

Schulte, Lars; Grydgaard, Anne; Jakobsen, Mathilde R.; Szewczykowski, Piotr; Guo, Fengxiao; Vigild, Martin Etchells; Berg, Rolf H.; Ndoni, Sokol

doi:10.1016/j.polymer.2010.11.038

Cited by 28 publications

(39 citation statements)

References 26 publications

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“…This expectation is based on the observation of nonporous surface by the SEM images in Figures 4b,e combined with the quantitative removal of PDMS in the etching process. 17 The surface composition of the skin and nonskin samples was further assessed by XPS (see Table S1 in SI). A short discussion of the XPS results and their consistency with the results from the other techniques is presented in the SI.…”

Section: Resultsmentioning

confidence: 99%

“…Such a coexistence has been earlier observed in the bulk of a similar block copolymer by SAXS measurements at different temperatures. 17 The length-scale of the peeled-off areas is probably related to external factors, such as variations in thermal contact between the polymer and the substrate during the cross-linking reaction. These may cause disparity in cross-linking rates and therefore variations in the morphology at the polymerÀsub-strate interface before it becomes fully frozen due to the high degree of cross-linking.…”

Section: Resultsmentioning

confidence: 99%

“…The 1,2-PB-b-PDMS copolymer was synthesized by living anionic polymerization as described in ref 17. The general procedure to prepare a nanoporous 1,2-PB membrane is as follows.…”

Section: Methodsmentioning

confidence: 99%

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Gyroid Nanoporous Membranes with Tunable Permeability

Li¹,

Schulte²,

Clausen³

et al. 2011

ACS Nano

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101

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Understanding the relevant permeability properties of ultrafiltration membranes is facilitated by using materials and procedures that allow a high degree of control on morphology and chemical composition. Here we present the first study on diffusion permeability through gyroid nanoporous cross-linked 1,2-polybutadiene (1,2-PB) membranes with uniform pores that, if needed, can be rendered hydrophilic. The gyroid porosity has the advantage of isotropic percolation with no need for structure prealignment. Closed (skin) or opened (nonskin) outer surface can be simply realized by altering the interface energy in the process of membrane fabrication. The morphology of the membranes' outer surface was investigated by scanning electron microscopy, contact angle, and X-ray photoelectron spectroscopy. The effective diffusion coefficient of glucose decreases from nonskin, to one-sided skin to two-sided skin membranes, much faster than expected by a naive resistance-in-series model; the flux through the two-sided skin membranes even increases with the membrane thickness. We propose a model that captures the physics behind the observed phenomena, as confirmed by flow visualization experiments. The chemistry of 1,2-PB nanoporous membranes can be controlled, for example, by hydrophilic patterning of the originally hydrophobic membranes, which allows for different active porosity toward aqueous solutions and, therefore, different permeability. The membrane selectivity is evaluated by comparing the effective diffusion coefficients of a series of antibiotics, proteins, and other biomolecules; solute permeation is discussed in terms of hindered diffusion. The combination of uniform bulk morphology, isotropically percolating porosity, controlled surface chemistry, and tunable permeability is distinctive for the presented gyroid nanoporous membranes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Gyroid Nanoporous Membranes with Tunable Permeability

Li¹,

Schulte²,

Clausen³

et al. 2011

ACS Nano

Self Cite

101

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“…Details about the preparation of nanoporous 1,2-polybutadiene polymer films have been described in previous work [12,15] and are only mentioned here briefly. First, the di-block copolymer 1,2-polybutadiene-b-polydimethylsiloxane (1,2-PB-b-PDMS) is dissolved in tetrahydrofuran (THF).…”

Section: Fabrication Of Nanoporous Dye Lasers By Direct Laser Writingmentioning

confidence: 99%

“…The cross-linked polymer substrates are subjected to selective chemical etching of the PDMS block using tetrabutylammonium fluoride in THF for 24 h. The substrates are further washed sequentially in THF and ethanol. The remaining 1,2 polybutadiene polymer contains a self assembled network of 14 nm diameter pores with a porosity of 44% [15].…”

Section: Fabrication Of Nanoporous Dye Lasers By Direct Laser Writingmentioning

confidence: 99%

Direct laser writing for nanoporous liquid core laser sensors

Großmann¹,

Christiansen²,

Peterson³

et al. 2012

Opt. Express

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Abstract:We report the fabrication of nanoporous liquid core lasers via direct laser writing based on two-photon absorption in combination with thiolene-chemistry. As gain medium Rhodamine 6G was embedded in the nanoporous polybutadiene matrix. The lasing devices with thresholds of 19 µJ/mm 2 were measured to have bulk refractive index sensitivities of 169 nm/RIU at a laser wavelength of 600 nm, demonstrating strongly increased overlap of the modes with the analyte in comparison to solid state evanescent wave sensors.

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Self‐Assembled Nanoporous Membranes for Controlled Drug Release and Bioseparation

Scalarone¹,

Bracco²,

Trotta³

2014

Smart Membranes and Sensors

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Th is chapter highlights recent activity in the area of nanoporous membranes templated by block copolymers . Asymmetric composite membranes and standalone membranes , membranes templated by the cylindrical morphology and bicontinuous nanoporous structures are presented. Fabrication procedures of nanoporous membranes based on self-assembling block copolymers are described, as well as their transport properties and size-selectivity. Since membranes derived from block copolymers have accessible pore size approaching the size scale of biological components, focus is placed especially on applications for controlled release of drugs and eff ective separation of biomolecules.

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Nanoporous materials from stable and metastable structures of 1,2-PB-b-PDMS block copolymers

Cited by 28 publications

References 26 publications

Gyroid Nanoporous Membranes with Tunable Permeability

Gyroid Nanoporous Membranes with Tunable Permeability

Direct laser writing for nanoporous liquid core laser sensors

Self‐Assembled Nanoporous Membranes for Controlled Drug Release and Bioseparation

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