Nanoporous polymer particles made by suspension polymerization: spontaneous symmetry breaking in hydrogen bonded smectic liquid crystalline droplets and high adsorption characteristics

Kuringen, Huub P. C. van; Mulder, Dirk J.; Beltran, Esther; Broer, Dirk J.; Schenning, Albert P. H. J.

doi:10.1039/c6py00865h

Cited by 24 publications

(30 citation statements)

References 32 publications

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“…Thermotropic nematics often develop planar alignment in water contact, hence the homeotropic alignment of our LCN shells is somewhat surprising, reminding more of what can be seen with smectic LCN droplets . Since the homeotropic orientation was present as soon as the nematic phase started developing, it is not a result of the network formation during crosslinking.…”

Section: Discussionmentioning

confidence: 78%

Micrometer‐Scale Porous Buckling Shell Actuators Based on Liquid Crystal Networks

Jampani

Mulder

Sousa

et al. 2018

Adv Funct Materials

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Micrometer-scale liquid crystal network (LCN) actuators have potential for application areas like biomedical systems, soft robotics, and microfluidics. To fully harness their power, a diversification in production methods is called for, targeting unconventional shapes and complex actuation modes. Crucial for controlling LCN actuation is the combination of macroscopic shape and molecular-scale alignment in the ground state, the latter becoming particularly challenging when the desired shape is more complex than a flat sheet. Here, one-step processing of an LCN precursor material in a glass capillary microfluidic set-up to mold it into thin shells is used, which are stretched by osmosis to reach a diameter of a few hundred micrometers and thickness on the order of a micrometer, before they are UV crosslinked into an LCN. The shells exhibit radial alignment of the director field and the surface is porous, with pore size that is tunable via the osmosis time. The LCN shells actuate reversibly upon heating and cooling. The decrease in order parameter upon heating induces a reduction in thickness and expansion of surface area of the shells that triggers continuous buckling in multiple locations. Such buckling porous shells are interesting as soft cargo carriers with capacity for autonomous cargo release.

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Section: Discussionmentioning

confidence: 78%

Micrometer‐Scale Porous Buckling Shell Actuators Based on Liquid Crystal Networks

Jampani

Mulder

Sousa

et al. 2018

Adv Funct Materials

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“…In order to overcome the aforementioned shortcomings, various novel functional porous adsorbents have been developed and attracted intensive research interesting in recent years . The influence of various parameters on the adsorption performance have been intensively investigated, including porous structure and the density of functional groups.…”

Section: Introductionmentioning

confidence: 99%

Effect of neighboring groups on the pH responsive adsorption/desorption behaviors of carboxylate functionalized hollow polymer particles

Luo

Liang

Dong

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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In this article, a serial of bi‐functionalized hollow polymer particles (BF‐HPPs), containing both carboxylate and different amide/amine groups [HPP‐NH2, HPP‐ethylenediamine (EDA), and HPP‐diethylenetriamine (DETA)], were specially designed and synthesized to investigate the effect of neighboring amino groups on their adsorption/desorption behavior. Due to the high density of carboxylate groups, these BF‐HPPs can serve as efficient adsorbents for selective removal of positively charged methylene blue (b‐MB). With increasing chain length of the neighboring amino groups, the maximum adsorption capacities (qmax) at pH 7 decrease dramatically from 606.1 mg g−1 for HPP‐NH2, to 404.9 mg g−1 for HPP‐EDA, and 332.2 mg g−1 for HPP‐DETA, due to increasing steric hindrance. Significantly, the equilibrium adsorption can be achieved within 15 min for HPP‐EDA and HPP‐DETA, while it takes more than 720 min for HPP‐NH2. Moreover, the qmax of HPP‐DETA exhibits remarkable pH‐sensitive property, which decreases sharply to 32.7 mg g−1 at pH 3 due to strong electrostatic repulsion between positively charged ammonium groups and b‐MB molecules. Accordingly, the desorption efficiency of HPP‐DETA reached up to 94% after one desorption step, which is much higher than that of HPP‐EDA (78%) and HPP‐NH2 (60%). The absorbed b‐MB can be facilely desorbed and the adsorption capacity of the regenerated HPP‐DETA keeps above 95% after five consecutive adsorption–desorption cycles. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 1404–1413

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“…[10] CPPs are derived from chiral polymers in nano-or microarchitectures, providing various unprecedented functional materials. In addition, up to date many kinds of approaches have been developed for preparing CPPs, e. g. suspension polymerization, [11] emulsion polymerization, [12] precipitation polymerization, [13] dispersion polymerization, [14] and self-assembly. [15] Typical examples of CPPs are fabricated from amino acid-based polymers, [16] substituted polyacetylenes, [3,17] and polyisocyanides.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Applications of Chiral Polymeric Particles

Zhang

Huang

Zhao

et al. 2018

Israel Journal of Chemistry

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Chiral polymeric particles (CPPs) have been gathering increasing interest as typical functional polymeric particles in recent decades. This article presents a review on the preparation and applications of CPPs. The methods for preparing CPPs are classified into two major groups: The first one is the direct polymerization of monomers and the other is the post-treatment of preformed polymers. CPPs have been explored as a unique type of chiral materials in various fields like asymmetric catalysis, enantioselective release, enantioselective crystallization, and enantioseparation. This review article is expected to accelerate the progress of scientific research dealing with CPPs and their applications in chirality-related fields.

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Nanoporous polymer particles made by suspension polymerization: spontaneous symmetry breaking in hydrogen bonded smectic liquid crystalline droplets and high adsorption characteristics

Abstract: A versatile and scalable suspension polymerization method is reported to synthesize nanoporous polymer particles.

Cited by 24 publications

References 32 publications

Micrometer‐Scale Porous Buckling Shell Actuators Based on Liquid Crystal Networks

Micrometer‐Scale Porous Buckling Shell Actuators Based on Liquid Crystal Networks

Effect of neighboring groups on the pH responsive adsorption/desorption behaviors of carboxylate functionalized hollow polymer particles

Preparation and Applications of Chiral Polymeric Particles

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