Evidence for the existence of crosslinked crystalline domains within cyclodextrin-based supramolecular hydrogels through sol–gel replication

Bleta, R.; Menuel, S.; Léger, B.; Costa, Antonio Da; Monflier, Éric; Ponchel, A.

doi:10.1039/c3ra47765g

Cited by 20 publications

(22 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[77] In addition, cross-links can be formed in at opological fashion, which implies that individual polymer chains are connected to each other through sliding CD units that are threaded on the polymer chains. [42,78] Self-healing and free-standing host-/guest-based hydrogels were reported by Harada and co-workers.…”

Section: Hydrogelsmentioning

confidence: 99%

Dynamic Macromolecular Material Design—The Versatility of Cyclodextrin‐Based Host–Guest Chemistry

2017

View full text Add to dashboard Cite

Dynamic and adaptive materials are powerful constructs in macromolecular and polymer chemistry with a wide array of applications in drug delivery, bioactive systems, and self‐healing materials. Very often, dynamic materials are based on carefully tailored cyclodextrin host–guest interactions. The precise incorporation of these host and guest moieties into macromolecular building blocks allows the formation of complex macromolecular structures with predefined functions. Thus, dynamic materials with extraordinary adaptive property profiles—responsive to thermal, chemical, and photonic fields—become accessible. This Review explores the hierarchical formation of dynamic materials and complex macromolecular structures from the molecular via the macromolecular to the colloidal and macroscopic level, with a specific emphasis on the functionality and responsiveness of the assemblies, specifically in biological contexts.

show abstract

Section: Hydrogelsmentioning

confidence: 99%

Dynamic Macromolecular Material Design—The Versatility of Cyclodextrin‐Based Host–Guest Chemistry

2017

View full text Add to dashboard Cite

show abstract

“…Figure shows an amorphous form with no reflection of crystallization of the triblock copolymer and a number of sharp absorption peaks of α‐CD. The characteristic peak at 2 θ = 19.4° of the system of α‐CD/MIDM represented the channel‐type structure of necklace‐like inclusion complexes of α‐CD and the flanking MPEG chains of the triblock polymer, due to the crystallizations of the MPEG threaded by α‐CD . This result of the X‐ray powder diffraction suggested that the rod‐contained block copolymer was formed by α‐CD threading onto the MPEG segments of the triblock copolymer (Scheme a) and its crystalline nature provided the primary driving force for the self‐assembly of the inclusion complexes.…”

Section: Resultsmentioning

confidence: 96%

“…The characteristic peak at 2 θ = 19.4° of the system of α-CD/MIDM represented the channel-type structure of necklace-like inclusion complexes of α-CD and the fl anking MPEG chains of the triblock polymer, due to the crystallizations of the MPEG threaded by α-CD. [ 18 ] This result of the X-ray powder diffraction suggested that the rod-contained block copolymer was formed by α-CD threading onto the MPEG segments of the triblock copolymer (Scheme 1 a) and its crystalline nature provided the primary driving force for the self-assembly of the inclusion complexes. To investigate the effects of the concentrations on the morphologies of the assembled nanostructures, three different concentration solutions with a fi xed pH at 9.2 were studied in detail by the transmission electron microscope (TEM) analysis.…”

Section: Resultsmentioning

confidence: 99%

Crystallization‐Driven Self‐Assembly of Rod–Coil–Rod Pseudopolyrotaxanes into Spherical Micelles, Nanorods, and Nanorings in Aqueous Solutions

Jin

Cheng

et al. 2015

Macromol. Rapid Commun.

View full text Add to dashboard Cite

A novel rod-containing block copolymer is constructed by supramacromolecular self-assembly of α-cyclodextrin and a triblock copolymer with methoxy polyethylene glycol as the flanking chains and the midterm block alternately connected by 2,2-dimethylolbutyric acid and isophorone diisocyanate. The assembled rod-containing block copolymer shows an exciting phenomenon of concentration- and pH-dependent morphological switching of well-defined nanostructures. In the solutions at pH 9.2, spherical micelles, rod-like micelles, and hydrogel are observed successively with an increase of the concentration. Notably, the rod-like micelles are composed of spherical segments due to the combination of the crystalline cores of the spherical micelles. In addition, 1D nanostructures with different curvatures from linear rod-like micelles (pH 9.2) to ring-shaped micelles (pH 7.5) can be obtained by controlling the pH values of the assembled systems.

show abstract

“…Randomly methylated β-CD (RaMeβCD) is one of the most widely used β-CD derivatives with a degree of substitution (DS) of about 12.6 and a molecular structure that confers to these oligosaccharide surface-active properties and high solubility in water (>500 mg/mL). Although the possibility of utilizing native or modified cyclodextrins as structure-directing agents in the synthesis of silica nanostructures has been explored so far [ 34 , 35 , 36 , 37 ], a smaller number of reports have been devoted to the practical applications of these materials. Recently, we have developed an efficient CD-assisted colloidal approach to prepare hierarchically porous silica [ 37 ], as well as mesoporous alumina [ 38 , 39 ] and titania materials [ 40 , 41 ] with enhanced activity in photocatalysis [ 40 , 41 , 42 ], heterogeneous catalysis [ 43 , 44 , 45 , 46 ], and biocatalysis [ 47 ].…”

Section: Introductionmentioning

confidence: 99%

Robust Ruthenium Catalysts Supported on Mesoporous Cyclodextrin-Templated TiO2-SiO2 Mixed Oxides for the Hydrogenation of Levulinic Acid to γ-Valerolactone

Decarpigny

Noël

Addad

et al. 2021

IJMS

Self Cite

View full text Add to dashboard Cite

In this paper, we present a versatile template-directed colloidal self-assembly method for the fabrication in aqueous phase of composition-tuned mesoporous RuO2@TiO2-SiO2 catalysts. Randomly methylated β-cyclodextrin/Pluronic F127 supramolecular assemblies were used as soft templates, TiO2 colloids as building blocks, and tetraethyl orthosilicate as a silica source. Catalysts were characterized at different stages of their synthesis using dynamic light scattering, N2-adsorption analysis, powder X-ray diffraction, temperature programmed reduction, high-resolution transmission electron microscopy, high-angle annular bright-field and dark-field scanning transmission electron microscopy, together with EDS elemental mapping. Results revealed that both the supramolecular template and the silica loading had a strong impact on the pore characteristics and crystalline structure of the mixed oxides, as well as on the morphology of the RuO2 nanocrystals. Their catalytic performance was then evaluated in the aqueous phase hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) under mild conditions (50 °C, 50 bar H2). Results showed that the cyclodextrin-derived catalyst displayed almost quantitative LA conversion and 99% GVL yield in less than one hour. Moreover, this catalyst could be reused at least five times without loss of activity. This work offers an effective approach to the utilization of cyclodextrins for engineering the surface morphology of Ru nanocrystals and pore characteristics of TiO2-based materials for catalytic applications in hydrogenation reactions.

show abstract

Evidence for the existence of crosslinked crystalline domains within cyclodextrin-based supramolecular hydrogels through sol–gel replication

Cited by 20 publications

References 45 publications

Dynamic Macromolecular Material Design—The Versatility of Cyclodextrin‐Based Host–Guest Chemistry

Dynamic Macromolecular Material Design—The Versatility of Cyclodextrin‐Based Host–Guest Chemistry

Crystallization‐Driven Self‐Assembly of Rod–Coil–Rod Pseudopolyrotaxanes into Spherical Micelles, Nanorods, and Nanorings in Aqueous Solutions

Robust Ruthenium Catalysts Supported on Mesoporous Cyclodextrin-Templated TiO2-SiO2 Mixed Oxides for the Hydrogenation of Levulinic Acid to γ-Valerolactone

Contact Info

Product

Resources

About