Two-dimensional pH-responsive printable smectic hydrogels

Shishmanova, Ivelina K.; Bastiaansen, Cees W. M.; Schenning, Albertus P. H. J.; Broer, Dirk J.

doi:10.1039/c2cc16873a

Cited by 34 publications

(58 citation statements)

References 12 publications

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“…A unique feature of this kind of highly ordered LC networks is their anisotropic swelling [77]. The polymer films swells only perpendicularly to the molecular director ( Fig.…”

Section: Hydrogen Bonding In Liquid Crystals As Nanoporous Networkmentioning

confidence: 99%

“…Potentially they could be used in drug delivery systems. Additionally, the self-organization of LCs can easily be combined with top-down techniques, such as inkjet printing and photolithography [77], which could be interesting to apply them in microfluidic devices. Furthermore, this smectic nanoporous network could be used as reaction medium, for instance for the formation of silver nanoparticles (NPs) [78].…”

Section: Hydrogen Bonding In Liquid Crystals As Nanoporous Networkmentioning

confidence: 99%

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Hydrogen Bonding in Supramolecular Nanoporous Materials

Kuringen¹,

Schenning

2015

Lecture Notes in Chemistry

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This chapter provides an overview of the use of hydrogen bonds for the construction of nanoporous materials. These materials attract a great deal of interest because of their large surface area to volume ratio and their applications in areas such as filtration, separation, adsorption, catalysis, and ion conduction. Organic materials are especially appealing for these applications, because their properties can be tailored. The use of supramolecular interactions is required to control the organization of materials at the molecular level. Hydrogen bonds are ideal supramolecular interactions for the construction of these nanoporous materials, thanks to their directionality and reversibility. The directionality causes the positioning molecules in such a way that voids have been created in between the molecules, such as in two-and three-dimensional hydrogen bonded organic frameworks. In a second approach, hydrogen bonded template molecules have been removed from a polymer to create pores. This method is successfully applied to hydrogen bonded block copolymers and liquid crystalline polymers.

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“…A unique feature of this kind of highly ordered LC networks is their anisotropic swelling [77]. The polymer films swells only perpendicularly to the molecular director ( Fig.…”

Section: Hydrogen Bonding In Liquid Crystals As Nanoporous Networkmentioning

confidence: 99%

Section: Hydrogen Bonding In Liquid Crystals As Nanoporous Networkmentioning

confidence: 99%

Hydrogen Bonding in Supramolecular Nanoporous Materials

Kuringen¹,

Schenning

2015

Lecture Notes in Chemistry

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“…24 The swelling mainly occurred perpendicular to the alignment direction of the LCs, and microscopy pictures revealed a macroscopic size increase of 43% (±10%). Parallel to the alignment direction a 7% (±6%) decrease was observed.…”

Section: Macromoleculesmentioning

confidence: 99%

Photoresponsive Nanoporous Smectic Liquid Crystalline Polymer Networks: Changing the Number of Binding Sites and Pore Dimensions in Polymer Adsorbents by Light

et al. 2015

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Photoresponsive nanoporous polymer films have been fabricated by adding a photoresponsive azobenzene cross-linker to a hydrogen-bonded smectic liquid crystalline polymer network. A base treatment resulted in the nanoporous material which has been fully characterized. Upon exposure to UV light a decrease in the smectic layer spacing is observed, suggesting a decrease in pore size. In addition, the binding sites in the material could be changed with light, leading to light-induced adsorption of cations and cationic dyes. Finally, light could also be used to create nanoporous channels in the polymer film.

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“…Since then, many approaches to create chemomechanical motion are currently being investigated, several of them being specifically based on soft material. These materials are capable of deforming their shape by external stimuli such as electric field [9,12], temperature [13,14], photo [15,16], pH [17], and solvent [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Asymmetry on Adhesion and Locomotion of Soft-Bodied Objects

Mondal

Ghatak

2015

Springer Tracts in Mechanical Engineering

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Limbless locomotion of soft-bodied objects has been achieved by variety of mechanisms: volume phase transition of hydrogels, periodic alterations of electric and photochemical field, rectification of noise on a substrate having asymmetric friction, and so on. In this report, we have presented a new method of inducing locomotion of soft elastomeric objects by generating geometric asymmetry in it. The asymmetry is generated by incomplete swelling of the material with an organic solvent. In particular, we have prepared cross-linked elastomeric cylinders which adhere weakly to a substrate. We have swelled these cylinders partially by dispensing a small quantity of solvent leading to their bending along length; the solvent however evaporates from portion of it exposed to the atmosphere. The bending causes a forward rolling motion which is sustained via continued supply of solvent from one side and its evaporation from the other. The velocity of rolling depends on several geometric and material properties: diameter and elastic modulus of the cylinder, surface tension, density and vapor pressure of the liquid, and its ability to swell the cross-linked network. The above mechanism enables the cylinder to locomote not only on a horizontal substrate but also up an inclined plane.Closely associated with locomotion is adhesion on a substrate, specifically the ability to adhere to it strongly from one direction but to separate easily from the other, which we have achieved by preparing adhesives embedded with closely spaced fluid-filled microchannels. The microchannels are arranged in pairs with a liquid filling on only one of them which generates spatial anisotropy in respect to surface topography and shear modulus of the adhesive. As a result, when an adherent is lifted off the adhesive, it requires different lift-off load to be exerted for separating it from two different directions.

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Two-dimensional pH-responsive printable smectic hydrogels

Abstract: Anisotropic swelling and deswelling of smectic liquid crystal networks have been observed in response to pH changes.

Cited by 34 publications

References 12 publications

Hydrogen Bonding in Supramolecular Nanoporous Materials

Hydrogen Bonding in Supramolecular Nanoporous Materials

Photoresponsive Nanoporous Smectic Liquid Crystalline Polymer Networks: Changing the Number of Binding Sites and Pore Dimensions in Polymer Adsorbents by Light

Effect of Asymmetry on Adhesion and Locomotion of Soft-Bodied Objects

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