Multicompartmental Mesoporous Silica/Polymer Nanostructured Hybrids: Design Capabilities by Integrating Linear and Star-Shaped Block Copolymers

Iatridi, Zacharoula; Evangelatou, Kyriaki; Theodorakis, Nikolaos; Angelopoulou, Athina; Avgoustakis, Konstantinos; Tsitsilianis, Constantinos

doi:10.3390/polym12010051

Cited by 5 publications

(5 citation statements)

References 48 publications

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“…The assignment of the weight lost was based on the TGA of similar polymers. ( Deng et al., 2007 ; Iatridi et al., 2020 ). The biphenyl product was extracted from the reaction solution by dichloromethane, then the solvent was evaporated, and the product was dissolved in deuterated chloroform (CDCl 3 ) and quantified by 1 H-NMR (Varian-INOVA 400 MHz, Agilent Technologies) with mesitylene used as the internal standard.…”

Section: Methodsmentioning

confidence: 99%

Mechanistic insight into deep holes from interband transitions in Palladium nanoparticle photocatalysts

et al. 2022

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Summary Utilizing hot electrons generated from localized surface plasmon resonance is of widespread interest in the photocatalysis of metallic nanoparticles. However, hot holes, especially generated from interband transitions, have not been fully explored for photocatalysis yet. In this study, a photocatalyzed Suzuki-Miyaura reaction using mesoporous Pd nanoparticle photocatalyst served as a model to study the role of hot holes. Quantum yields of the photocatalysts increase under shorter wavelength excitations and correlate to “deeper” energy of the holes from the Fermi level. This work suggests that deeper holes in the d -band catalyze the oxidative addition of aryl halide R-X onto Pd 0 at the nanoparticles' surface to form R-Pd II -X complex, thus accelerating the rate-determining step of the catalytic cycle. The hot electrons do not play a decisive role. In the future, catalytic mechanisms induced by deep holes should deserve as much attention as the well-known hot electron transfer mechanism.

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Section: Methodsmentioning

confidence: 99%

Mechanistic insight into deep holes from interband transitions in Palladium nanoparticle photocatalysts

et al. 2022

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“…Moreover, the presence of mPEG ether bonds leads to create apeak at 1108 cm À 1 (CÀ O bond). [43] The block copolymers designed with hydrophilic/hydrophobic structures have a good ability to be used as compatibilizer and dispersing macromolecules for nano silica [44] and clay particles. [45]…”

Section: Synthesis Of Block Copolymer Of Poly (1-hexene -Copolyethyle...mentioning

confidence: 99%

Functionalization of Poly (1‐hexene) with Maleic Anhydride: The Effect of Reaction Parameters

et al. 2023

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The functionalization of poly (1-hexene) with maleic anhydride (MA) in the presence of benzoyl peroxide as initiator was investigated and the effect of reaction parameters such as initiator content, maleic anhydride concentrations, reaction temperature and reaction time were studied. Furthermore, changing the catalyst system from a commercial Ziegler-Natta (TiCl 4 /MgCl 2 /Internal donor) to α-diimine Nickel catalyst led to a higher degree of functionalization (DOF) thanks to higher unsaturation content of polymer chains made by the Nickel catalyst system. The obtained polymer moreover was contacted with polyethylene glycol methyl ether to ensure the attachment of the functionalizing agent on the poly (1-hexene) chains. Different analyses were used to support the observations. For instance, thermogravimetric analysis (TGA) exhibited no weight loss at 210 °C for the sample confirming, the complete reaction of maleic anhydride, or FTIR analysis, where the presence of ester group bands was evidence for the reaction.

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“…In order to overcome this obstacle, surface functionalization of the silica particles is a prerequisite. The modification of the silica surface with polymers is a key method that offers improved and additional properties to the silica particles [ 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

pH/Thermo-Responsive Grafted Alginate-Based SiO2 Hybrid Nanocarrier/Hydrogel Drug Delivery Systems

et al. 2021

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We report the preparation of mesoporous silica nanoparticles covered by layer by layer (LbL) oppositely charged weak polyelectrolytes, comprising poly(allylamine hydrochloride) (PAH) and a sodium alginate, highly grafted by N-isopropylacrylamide/N-tert-butylacrylamide random copolymers, NaALG-g-P(NIPAM90-co-NtBAM10) (NaALG-g). Thanks to the pH dependence of the degree of ionization of the polyelectrolytes and the LCST-type thermosensitivity of the grafting chains of the NaALG-g, the as-prepared hybrid nanoparticles (hNP) exhibit pH/thermo-responsive drug delivery capabilities. The release kinetics of rhodamine B (RB, model drug) can be controlled by the number of PAH/NaALG-g bilayers and more importantly by the environmental conditions, namely, pH and temperature. As observed, the increase of pH and/or temperature accelerates the RB release under sink conditions. The same NaALG-g was used as gelator to fabricate a hNP@NaALG-g hydrogel composite. This formulation forms a viscous solution at room temperature, and it is transformed to a self-assembling hydrogel (sol-gel transition) upon heating at physiological temperature provided that its Tgel was regulated at 30.7 °C, by the NtBAM hydrophobic monomer incorporation in the side chains. It exhibits excellent injectability thanks to its combined thermo- and shear-responsiveness. The hNP@NaALG-g hydrogel composite, encapsulating hNP covered with one bilayer, exhibited pH-responsive sustainable drug delivery. The presented highly tunable drug delivery system (DDS) (hNP and/or composite hydrogel) might be useful for biomedical potential applications.

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Multicompartmental Mesoporous Silica/Polymer Nanostructured Hybrids: Design Capabilities by Integrating Linear and Star-Shaped Block Copolymers

Cited by 5 publications

References 48 publications

Mechanistic insight into deep holes from interband transitions in Palladium nanoparticle photocatalysts

Mechanistic insight into deep holes from interband transitions in Palladium nanoparticle photocatalysts

Functionalization of Poly (1‐hexene) with Maleic Anhydride: The Effect of Reaction Parameters

pH/Thermo-Responsive Grafted Alginate-Based SiO2 Hybrid Nanocarrier/Hydrogel Drug Delivery Systems

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