Single-step coating of polyethylenimine on gradient nanoporous phenolics for tight membranes with ultrahigh permeance

Guo, Leiming; Yang, Yazhi; Wang, Yong

doi:10.1016/j.memsci.2019.117172

Cited by 11 publications

(8 citation statements)

References 54 publications

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“…Modification by polyelectrolyte is a promising approach for development of antifouling membranes due to polyelectrolyte’s high hydration ability, possibility to tune surface charge and versatility of chemistry, structure and modification techniques which can be implemented [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ]. Moreover, modification by polyelectrolytes is a flexible instrument for design of thin film composite membranes for microfiltration [ 29 ], ultrafiltration (UF) [ 30 , 31 , 32 , 33 , 34 , 35 , 36 ], nanofiltration (NF) [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ,…”

Section: Introductionmentioning

confidence: 99%

Modification of Polysulfone Ultrafiltration Membranes via Addition of Anionic Polyelectrolyte Based on Acrylamide and Sodium Acrylate to the Coagulation Bath to Improve Antifouling Performance in Water Treatment

et al. 2020

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Surface modification of polysulfone ultrafiltration membranes was performed via addition of an anionic polymer flocculant based on acrylamide and sodium acrylate (PASA) to the coagulation bath upon membrane preparation by non-solvent induced phase separation (NIPS). The effect of PASA concentration in the coagulant at different coagulation bath temperatures on membrane formation time, membrane structure, surface roughness, hydrophilic-hydrophobic balance of the skin layer, surface charge, as well as separation and antifouling performance was studied. Scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy, contact angle and zeta potential measurements were utilized for membrane characterization. Membrane barrier and antifouling properties were evaluated in ultrafiltration of model solutions containing human serum albumin and humic acids as well as with real surface water. PASA addition was found to affect the kinetics of phase separation leading to delayed demixing mechanism of phase separation due to the substantial increase of coagulant viscosity, which is proved by a large increase of membrane formation time. Denser and thicker skin layer is formed and formation of macrovoids in membrane matrix is suppressed. FTIR analysis confirms the immobilization of PASA macromolecules into the membrane skin layer, which yields improvement of hydrophilicity and change of zeta potential. Modified membrane demonstrated better separation and antifouling performance in the ultrafiltration of humic acid solution and surface water compared to the reference membrane.

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Section: Introductionmentioning

confidence: 99%

Modification of Polysulfone Ultrafiltration Membranes via Addition of Anionic Polyelectrolyte Based on Acrylamide and Sodium Acrylate to the Coagulation Bath to Improve Antifouling Performance in Water Treatment

et al. 2020

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“…As an example for the use of phenolic resin microdots as anchoring sites for further functionalizations, we bound PEI, a polyelectrolyte characterized by abundance of amino groups, to the surfaces of the phenolic resin microdots. We adapted a procedure reported elsewhere 30 and immersed the QCM resonators patterned with phenolic resin microdots into aqueous PEI solutions. PEI molecules adsorb to phenolic resin via electrostatic interactions and the formation of hydrogen bonds (Figure 4a).…”

Section: Resultsmentioning

confidence: 99%

“…29 Thus, porous phenolic resins were used for carbon capture 28 and as a material for separation membranes. 23,30,31 Here, we report an optimized two-step thermopolymerization combined with replication molding, which yields porous phenolic resin dual-use stamps with a granular-porous morphology and with topographically micropatterned contact surfaces for parallel additive microcontact lithography. Under moderate contact pressures (here about 5.3 kN/m 2 ), these porous phenolic resin stamps are used under ambient conditions for manual nondestructive capillary stamping of dye solutions selected as model inks.…”

Section: Introductionmentioning

confidence: 99%

“…Examples for the optimization of synthetic strategies to enhance the usability of porous phenolic resins include the formation of network-reinforcing molecular bridges by Friedel–Crafts alkylations and polymerization under hypersaline conditions . Thus, porous phenolic resins were used for carbon capture and as a material for separation membranes. ,, …”

Section: Introductionmentioning

confidence: 99%

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Phenolic Resin Dual-Use Stamps for Capillary Stamping and Decal Transfer Printing

Guo

Klein

Thien

et al. 2021

ACS Appl. Mater. Interfaces

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We report an optimized two-step thermopolymerization process carried out in contact with micropatterned molds that yields porous phenolic resin dual-use stamps with topographically micropatterned contact surfaces. With these stamps, two different parallel additive substrate manufacturing methods can be executed: capillary stamping and decal transfer microlithography. Under moderate contact pressures, the porous phenolic resin stamps are used for nondestructive ink transfer to substrates by capillary stamping. Continuous ink supply through the pore systems to the contact surfaces of the porous phenolic resin stamps enables multiple successive stamp−substrate contacts for lithographic ink deposition under ambient conditions. No deterioration of the quality of the deposited pattern occurs, and no interruptions for ink replenishment are required. Under a high contact pressure, porous phenolic resin stamps are used for decal transfer printing. In this way, the tips of the stamps' contact elements are lithographically transferred to counterpart substrates. The granular nature of the phenolic resin facilitates the rupture of the contact elements upon stamp retraction. The deposited phenolic resin micropatterns characterized by abundance of exposed hydroxyl groups are used as generic anchoring sites for further application-specific functionalizations. As an example, we deposited phenolic resin micropatterns on quartz crystal microbalance resonators and further functionalized them with polyethylenimine for preconcentration sensing of humidity and gaseous formic acid. We envision that also preconcentration coatings for other sensing methods, such as attenuated total reflection infrared spectroscopy and surface plasmon resonance spectroscopy, are accessible by this functionalization algorithm.

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“…40 The absorption bands of -OH and N-H were assigned at around 3429 cm À1 in the green circle. 41 Due to the crosslinking by TMC, the broad peak became weaker in M 0 and M 2 . M 0 and M 2 showed a newly emerged broad peak at around 1725 cm À1 owing to the stretching vibrations of the ester groups (-COO) provided by the crosslinking of TA and TMC.…”

Section: Antifouling Property Of the Membranementioning

confidence: 98%

Preparation of a novel zwitterionic striped surface thin-film composite nanofiltration membrane with excellent salt separation performance and antifouling property

Lin

Tan²,

Li³

et al. 2020

RSC Adv.

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Single-step coating of polyethylenimine on gradient nanoporous phenolics for tight membranes with ultrahigh permeance

Cited by 11 publications

References 54 publications

Modification of Polysulfone Ultrafiltration Membranes via Addition of Anionic Polyelectrolyte Based on Acrylamide and Sodium Acrylate to the Coagulation Bath to Improve Antifouling Performance in Water Treatment

Modification of Polysulfone Ultrafiltration Membranes via Addition of Anionic Polyelectrolyte Based on Acrylamide and Sodium Acrylate to the Coagulation Bath to Improve Antifouling Performance in Water Treatment

Phenolic Resin Dual-Use Stamps for Capillary Stamping and Decal Transfer Printing

Preparation of a novel zwitterionic striped surface thin-film composite nanofiltration membrane with excellent salt separation performance and antifouling property

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