Block Copolymer Membranes

Nunes, Suzana Pereira

doi:10.1016/b978-0-12-814681-1.00011-4

Cited by 12 publications

(16 citation statements)

References 135 publications

(163 reference statements)

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“…The methodology developed was applied to a variety of other membranes 14 . The field was recently reviewed by Nunes 95 …”

Section: Gisaxs Application Examplesmentioning

confidence: 99%

GISAXS: A versatile tool to assess structure and self‐assembly kinetics in block copolymer thin films

Smilgies

2021

Journal of Polymer Science

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Over the past two decades grazing incidence small-angle scattering (GISAXS) has morphed into a powerful tool for the determination of the structure and self-assembly kinetics of block copolymer thin films. An overview of the scattering process and the interpretation of GISAXS data is given and experimental requirements are discussed. The application of the technique for the characterization of block copolymer thin films is illustrated with selected examples.

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“…The methodology developed was applied to a variety of other membranes 14 . The field was recently reviewed by Nunes 95 …”

Section: Gisaxs Application Examplesmentioning

confidence: 99%

GISAXS: A versatile tool to assess structure and self‐assembly kinetics in block copolymer thin films

Smilgies

2021

Journal of Polymer Science

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“…Comparison of directed self-assembly (DSA) and self-assembly and nonsolvent-induced phase separation (SNIPS) techniques for fabricating porous thin film membranes. In DSA (top), a block copolymer (BCP) solution containing a nonselective solvent is evaporated slowly and annealed to form ordered cylinders with hexagonal packing that lie perpendicular to a substrate. ,,,, The cylinder block can then be etched to form pores. − In SNIPS (bottom), a block copolymer solution typically containing a selective solvent forms micelles before or during solvent evaporation. ,, The structure of the micelle, including which block is in the core or corona, depends on the interactions (i.e., χ parameters) between the blocks and solvent . This illustration assumes the hydrophilic block forms the corona.…”

Section: Using Directed Self-assembly To Enhance Ultrafiltration Memb...mentioning

confidence: 99%

“… Cylinder alignment perpendicular to the film surface is necessary to create pores that span the selective layer and are open at both the top and bottom surfaces of the film. Recent developments in thin film lithography have enabled orientation control through a variety of strategies, including controlling solvent evaporation rate, using a solvent that has nearly equal selectivity for both phases, coating the substrate with a nonpreferential wetting layer, or applying an external electrical field. ,− The hydrolyzable phase can then be removed to form isoporous channels for water transport. − The size of the cylindrical phase and resulting pore sizes can be controlled by adjusting block copolymer molecular weight, Flory–Huggins interaction (χ) parameter, and volume fraction of the hydrolyzable block. , Alternatively, bicontinuous morphologies could be targeted that would obviate the need for precise cylinder alignment …”

Section: Using Directed Self-assembly To Enhance Ultrafiltration Memb...mentioning

confidence: 99%

“…56−59 In SNIPS (bottom), a block copolymer solution typically containing a selective solvent forms micelles before or during solvent evaporation. 58,65,66 The structure of the micelle, including which block is in the core or corona, depends on the interactions (i.e., χ parameters) between the blocks and solvent. 67 This illustration assumes the hydrophilic block forms the corona.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Figure 3). The pore formation mechanism in the surface layer is not well understood, 58,81 but nanoscale pores may arise as solvent and nonsolvent exchange in the solvated hydrophilic blocks of the ordered micelles, precipitating the polymer and forming pores containing trapped nonsolvent. 66,68,70,81 The air−solution interface may also affect pore morphology.…”

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Can Self-Assembly Address the Permeability/Selectivity Trade-Offs in Polymer Membranes?

Moon¹,

Freeman²,

Hawker³

et al. 2020

Macromolecules

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In 1999, Freeman published a visionary article that proposed a molecular basis for the trade-off between permeability and selectivity for polymeric gas separation membranes, which is often codified as an “upper bound”. This work has had major impacts in the gas separation membrane community and is paralleled by developments in the water purification membrane literature. A common theme between both communities is optimizing free volume or pore size distributions in polymer membranes to maximize separation performance. In guiding future development in the field, we identify the need to develop isoporous ultrafiltration membranes and highlight the potential for block copolymer self-assembly to achieve direct access to “structure by design” without requiring complex optimization of phase inversion processes.

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How does Micro‐ and Macro‐Phase Separation of Block Copolymers Affect the Formation of Integral Asymmetric Isoporous Membranes? A Review on Effective Factors

Foroutani

Ghasemi

2022

Macro Materials & Eng

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Self-standing isoporous membranes based on amphiphilic block copolymers (BCPs) are an outstanding candidate for efficient separation processes. Such fascinating membranes have been generated through combining the BCP self-assembly (micro-phase separation) together with the classical non-solvent induced phase separation (macro-phase separation), known as SNIPS process. However, the controllability, reproducibility, and cost-effectiveness of the process along with the mechanism for pores generation are still challenging in the SNIPS strategy, especially when new BCP or conditions are utilized. It is mainly due to the narrow efficacy window of numerous variables influencing the desired structure formation. In this review, first, an overview of the one-step readily scalable SNIPS technique and the stepwise explanation of the process are given. Then the formation mechanism of SNIPS membranes, according to the related hypotheses and assumptions proposed on the basis of experimental evidence so far, is presented and discussed. As the main focus , governing factors in the SNIPS process which affect the preparation and structural characteristics of final membrane structures are entirely reviewed and interpreted. This review will help to have a better understanding of the connection between determinant factors and final membrane structure, which facilitates successful preparation of BCP membranes via SNIPS.

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Block Copolymer Membranes

Cited by 12 publications

References 135 publications

GISAXS: A versatile tool to assess structure and self‐assembly kinetics in block copolymer thin films

GISAXS: A versatile tool to assess structure and self‐assembly kinetics in block copolymer thin films

Can Self-Assembly Address the Permeability/Selectivity Trade-Offs in Polymer Membranes?

How does Micro‐ and Macro‐Phase Separation of Block Copolymers Affect the Formation of Integral Asymmetric Isoporous Membranes? A Review on Effective Factors

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