Fluid Flow Programming in Paper-Derived Silica–Polymer Hybrids

Dubois, Christelle; Herzog, Nicole; Rüttiger, Christian; Geißler, Andreas; Grange, Eléonor; Kunz, Ulrike; Kleebe, Hans‐Joachim; Biesalski, Markus; Meckel, Tobias; Gutmann, Torsten; Gallei, Markus; Andrieu‐Brunsen, Annette

doi:10.1021/acs.langmuir.6b03839

Cited by 14 publications

(26 citation statements)

References 58 publications

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“…This technique has the advantage that the nuclei of the inorganic component, i.e., 29 Si, and the nuclei of the organic component, i.e., 13 C, have specific chemical shift ranges that allow a precise analysis of their chemical environment and thus the clear identification of functional groups and their connectivity. Many examples of silica hybrid materials containing organic polymers are found in the literature [ 30 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ], where the potential of 29 Si and 13 C solid-state NMR techniques were demonstrated to obtain detailed structural information. Figure 5 shows the 29 Si static spectra of the three linker systems and the corresponding 29 Si CP MAS spectra of the lyophilized powder samples for comparison.…”

Section: Resultsmentioning

confidence: 99%

Free-Standing and Self-Crosslinkable Hybrid Films by Core–Shell Particle Design and Processing

et al. 2017

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The utilization and preparation of functional hybrid films for optical sensing applications and membranes is of utmost importance. In this work, we report the convenient and scalable preparation of self-crosslinking particle-based films derived by directed self-assembly of alkoxysilane-based cross-linkers as part of a core-shell particle architecture. The synthesis of well-designed monodisperse core-shell particles by emulsion polymerization is the basic prerequisite for subsequent particle processing via the melt-shear organization technique. In more detail, the core particles consist of polystyrene (PS) or poly(methyl methacrylate) (PMMA), while the comparably soft particle shell consists of poly(ethyl acrylate) (PEA) and different alkoxysilane-based poly(methacrylate)s. For hybrid film formation and convenient self-cross-linking, different alkyl groups at the siloxane moieties were investigated in detail by solid-state Magic-Angle Spinning Nuclear Magnetic Resonance (MAS, NMR) spectroscopy revealing different crosslinking capabilities, which strongly influence the properties of the core or shell particle films with respect to transparency and iridescent reflection colors. Furthermore, solid-state NMR spectroscopy and investigation of the thermal properties by differential scanning calorimetry (DSC) measurements allow for insights into the cross-linking capabilities prior to and after synthesis, as well as after the thermally and pressure-induced processing steps. Subsequently, free-standing and self-crosslinked particle-based films featuring excellent particle order are obtained by application of the melt-shear organization technique, as shown by microscopy (TEM, SEM).

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Section: Resultsmentioning

confidence: 99%

Free-Standing and Self-Crosslinkable Hybrid Films by Core–Shell Particle Design and Processing

et al. 2017

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“…Another possible solution to overcome the reduced film stability, while maintaining the excellent solvent uptake and release capabilities, is the use of highly porous paper sheets as support. In general, cellulose–polymer composites exhibit excellent transport of fluid phases through the channels of the hierarchically architecture material due to capillary forces . Paper‐supported and solvent‐responsive elastomeric opal films based on core/shell architectures featuring remarkably distinct iridescent reflection colors were therefore prepared by the melt‐shear organization technique .…”

Section: Stimuli‐responsive Opal Structures After Shear‐assembly Of Cmentioning

confidence: 99%

Functional Polymer Opals and Porous Materials by Shear‐Induced Assembly of Tailor‐Made Particles

Gallei

2017

Macromol. Rapid Commun.

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Photonic band-gap materials attract enormous attention as potential candidates for a steadily increasing variety of applications. Based on the preparation of easily scalable monodisperse colloids, such optically attractive photonic materials can be prepared by an inexpensive and convenient bottom-up process. Artificial polymer opals can be prepared by shear-induced assembly of core/shell particles, yielding reversibly stretch-tunable materials with intriguing structural colors. This feature article highlights recent developments of core/shell particle design and shear-induced opal formation with focus on the combination of hard and soft materials as well as crosslinking strategies. Structure formation of opal materials relies on both the tailored core/shell architecture and the parameters for polymer processing. The emphasis of this feature article is on elucidating the particle design and incorporation of addressable moieties, i.e., stimuli-responsive polymers as well as elaborated crosslinking strategies for the preparation of smart (inverse) opal films, inorganic/organic opals, and ceramic precursors by shear-induced ordering.

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“…To design Janus‐type paper hybrid materials with asymmetric wettability and capillary‐driven fluid flow, we modified lab‐engineered eucalyptus sulfate paper with extremely low amounts of silica. Asymmetric silica coating distribution and thus wetting and fluid flow gradients are achieved through a dip‐coating process in a tetraethoxysilane‐containing ethanol‐water‐based solution, adapted from our prior work, together with a subsequent heat treatment at 130 °C at atmospheric pressure or at reduced pressure ( Figure a–c) . The temperature of 130 °C was chosen because it is known to be nondestructive to eucalyptus paper while allowing acid (i.e., HCl)‐catalyzed hydrolysis and condensation of TEOS, resulting in silica formation .…”

Section: Resultsmentioning

confidence: 99%

Janus‐Type Hybrid Paper Membranes

Nau

Herzog

Schmidt

et al. 2019

Adv Materials Inter

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asymmetric chemical properties, both in bulk and in surface-confined coatings. [1][2][3][4][5] Referencing their two-faced nature, such asymmetric material properties are often named after the Roman god Janus. In particular, the behavior of membranes, particles, rods, or micelles with two orthogonal sides shows high potential for different applications, such as oil/water separation, droplet manipulation, fog collection, unidirectional water flow design, bubble aeration, ion gating, and energy harvesting. [6][7][8][9][10][11][12] In particular, asymmetrically designed membranes show strong potential for improved transport design and thus improved application performance. Directed oil-water transport in the context of oil-water separation and directed gas-water transport in the context of fuel cell gas diffusion layers are two specific application examples. [13,14] Therefore, enhancing control of material design and reducing the amount of material needed to achieve asymmetric material characteristics such as wettability are still an ongoing challenge. To make this situation even more stimulating, applying biocompatible and degradable materials while retaining needed stability and doing this in simple, ideally single-step, scalable fabrication processes are of increasing demand.Janus materials in general are well known since the Nobel Prize lecture of de Gennes in 1991, but they were first mentioned in 1898 by the group of Veyssié. [15,16] The general definition of Janus materials is diverse and includes all materials with asymmetric surfaces as well as composite bulk materials. In 2016, the group of Xu reshaped the definition of materials having opposing properties at two respective interfaces and proposed three configurations of so-called Janus membranes. [5] One is the "A to B"-type material, which shows a physical and/or chemical gradient across a membrane cross-section. Alternatively, A-to-B or A-and B-type Janus membranes are defined as having a clear interface between the layers. Within the last few years, the Jiang group developed a coating and peeling strategy for the facile preparation of multifunctional Janus membranes based on synthetic polymers such as polyethylene terephthalate (PET)/polytetrafluoroethylene (PTFE). [1] After membrane modification by tannic acid (TA) and diethylenetriamine to form a hydrophilic coating on the surface, peeling off the top PTFE layer from the hydrophilic membrane results in a Janus membrane showing unidirectional water permeation properties at Functional paper-based materials and devices have been increasingly attractive to scientists in the recent past. In particular, the possibility to functionalize the surface of paper fibers with tailor-made coatings has broadened a possible scope of emerging application considerably. This work introduces novel functional paper membranes with adjustable gradient and Janus-type wettability based on gradient and Janus-type silica coating distribution along the paper cross-section. Correlation of CLSM (distribution), thermogravimetric an...

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Fluid Flow Programming in Paper-Derived Silica–Polymer Hybrids

Cited by 14 publications

References 58 publications

Free-Standing and Self-Crosslinkable Hybrid Films by Core–Shell Particle Design and Processing

Free-Standing and Self-Crosslinkable Hybrid Films by Core–Shell Particle Design and Processing

Functional Polymer Opals and Porous Materials by Shear‐Induced Assembly of Tailor‐Made Particles

Janus‐Type Hybrid Paper Membranes

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