Covalent Organic Frameworks as Efficient Photoinitiators and Cross-Linkers To Fabricate Highly Stretchable Hydrogels

Review Chemistry, Multidisciplinary

Emerging porous organic polymers for biomedical applications

Youlong Zhu et al.

Summary: This review summarizes the recent progress in the biomedical applications of porous organic polymers (POPs), including drug delivery, bioimaging, and photothermal therapy.

CHEMICAL SOCIETY REVIEWS (2022)

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Article Polymer Science

Carbon nitride-coated transparent glass vials as photoinitiators for radical polymerization

Baris Kumru et al.

Summary: Using metal-free semiconductor polymeric carbon nitride as a photocatalyst, performance and effectiveness in automated or continuous flow polymer synthesis have been improved. This method eliminates the necessity of adding or removing initiators, works at room temperature, and provides a platform for cheap and effective polymer synthesis in the age of automated synthesis.

JOURNAL OF POLYMER SCIENCE (2022)

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Article Chemistry, Physical

Graphitic carbon nitride colloid as one photoinitiator for two-step polymerization

Yufeng Luo et al.

Summary: This study investigates the application of g-C3N4 as a photoinitiator in the preparation of functional hybrid hydrogels. By utilizing a two-step polymerization, a g-C3N4/PNIPAM/PAN hydrogel with excellent photothermal effect and electrical conductivity was obtained, avoiding excessive usage of traditional molecular initiators.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2022)

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Article Nanoscience & Nanotechnology

In Situ Synthesis of Gold Nanoclusters in Covalent Organic Frameworks with Enhanced Photodynamic Properties and Antibacterial Performance

Hean Zhang et al.

Summary: In this work, ultrasmall gold nanoclusters (AuNCs) were synthesized in situ in the nanopores of covalent organic framework (COF) nanoparticles, resulting in enhanced fluorescence, improved photosensitizing capabilities, and promising antibacterial performance. The incorporation of AuNCs into COFs led to efficient electron transfer and increased separation of photogenerated electron-hole pairs, significantly enhancing the light-triggered reactive oxygen species (ROS) production of COFs. The resulting nanocomposites exhibited efficient photodynamic killing on Escherichia coli under visible light exposure. This study provides a facile strategy for the preparation of COF/AuNC nanocomposites for ROS-related applications.

ACS APPLIED BIO MATERIALS (2022)

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Article Nanoscience & Nanotechnology

Internal Chemiluminescence Light-Driven Photocatalysis

Yufeng Luo et al.

Summary: The research explores the possibility of using chemiluminescence as internal light to drive photocatalysis, employing graphitic carbon nitride as the catalyst with efficient catalytic activity. A biphasic reaction is utilized with the light-generating reaction occurring in the oil phase, and photocatalysis mainly taking place in the aqueous phase.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Article Chemistry, Multidisciplinary

Quantum Photoinitiators: Toward Emerging Photocuring Applications

Nir Waiskopf et al.

Summary: Semiconductor nanocrystals, as promising photocatalysts, have diverse properties that depend on multiple parameters, such as composition, dimensions, architecture, surface coating, and environmental conditions.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Nanoscience & Nanotechnology

Free Radical Polymerization of Gold Nanoclusters and Hydrogels for Cell Capture and Light-Controlled Release

Shuxian Zhu et al.

Summary: Gold nanoclusters copolymerized with hydrogels exhibit good stability, efficient photothermal conversion, and high thermoresponsiveness. The C=C bonds on the surface of AuNCs protect the structure and connect them with polymer chains, improving the mechanical properties of the hydrogels.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Article Chemistry, Multidisciplinary

Nanoscale Covalent Organic Frameworks with Donor-Acceptor Structure for Enhanced Photothermal Ablation of Tumors

Rui Xia et al.

Summary: This study successfully developed a series of COFs based on the electron donor-acceptor strategy with excellent colloidal stability and adjustable sizes, as well as varying absorption spectra. By altering the electron-donating ability of the monomers, these COFs exhibit a wide range of absorption spectra and potent photothermal activity, effectively inhibiting tumor growth.

ACS NANO (2021)

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Article Chemistry, Multidisciplinary

Light-Triggered In Situ Gelation of Hydrogels using 2D Molybdenum Disulfide (MoS2) Nanoassemblies as Crosslink Epicenter

Hung Pang Lee et al.

Summary: Light-responsive biomaterials based on NIR-triggered in situ gelation system using defect-rich 2D MoS2 nanoassemblies and thiol-functionalized thermoresponsive polymer without a photoinitiator have been introduced. This system leverages the photothermal characteristics of MoS2 and intrinsic phase transition ability of the thermoresponsive polymer upon exposure to NIR radiation. The crosslinked gel shows potential for NIR light-responsive release of encapsulated therapeutics and various biomedical applications.

ADVANCED MATERIALS (2021)

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Review Biochemistry & Molecular Biology

Photopolymerized Porous Hydrogels

Erwan Nicol

Summary: Hydrogels, highly swollen polymeric networks, are versatile materials mimicking biological tissues, making them interesting for biomedical applications. Porosity control plays a crucial role in determining transport properties and cell fate. Photopolymerization is a powerful and versatile synthetic route for generating hydrogels with controlled porosity, with applications in controlled release and tissue engineering.

BIOMACROMOLECULES (2021)

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Article Chemistry, Multidisciplinary

Porous 2D and 3D Covalent Organic Frameworks with Dimensionality-Dependent Photocatalytic Activity in Promoting Radical Ring-Opening Polymerization

Kaixuan Wang et al.

Summary: The study demonstrates that the photocatalytic performance of COFs is heavily dependent on their structural dimensionality, with 2D-PN COFs showing higher catalytic activity and improved synthesis performance compared to 3D-PN COFs.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Biotechnology & Applied Microbiology

Magnetic COFs as satisfied support for lipase immobilization and recovery to effectively achieve the production of biodiesel by great maintenance of enzyme activity

Zi-Wen Zhou et al.

Summary: The study presented a core-shell magnetic COF composite for immobilizing Rhizomucor miehei lipase to produce biodiesel, demonstrating excellent immobilization efficiency and catalytic performance.

BIOTECHNOLOGY FOR BIOFUELS (2021)

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Article Polymer Science

Photocontrolled RAFT Polymerization Catalyzed by Conjugated Polymers under Aerobic Aqueous Conditions

Huan Lu et al.

Summary: Photocontrolled polymerization using PBF as a photocatalyst allows for effective control of reaction progress and preparation of polymers with narrow molecular weight distributions. The reaction can be controlled by switching irradiation conditions, and block copolymers can be prepared from chain extension of a macro-initiator. Antioxidants like ascorbate play a key role in the reduction of chain transfer agents during the process.

ACS MACRO LETTERS (2021)

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Article Polymer Science

Durable and recyclable conjugated microporous polymer mediated controlled radical polymerization under white LED light irradiation

Longqiang Xiao et al.

Summary: Photo-induced controlled radical polymerization using a newly synthesized imine-based conjugated microporous polymer material showed excellent catalytic efficiency, stability, and recyclability under mild conditions. The polymerization process can be initiated and controlled by alkyl radicals generated from alkyl iodide under white LED light. This method demonstrated high chain-end fidelity and an ideal photo on-off switchable system, making it a promising heterogeneous photocatalyst with easy separation and efficient reusability.

POLYMER CHEMISTRY (2021)

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Review Polymer Science

Light-Mediated Polymerization Induced by Semiconducting Nanomaterials: State-of-the-Art and Future Perspectives

Yifan Zhu et al.

Summary: Direct capture of solar energy for chemical transformation via photocatalysis is a cost-effective and energy-saving approach for constructing organic compounds. Photopolymerization, a robust strategy for producing specialty polymers with complex structures, faces a key challenge of scarcity in effective photomediators. Nanomaterials, especially semiconducting nanomaterials, are promising candidates for photochemical reactions due to their unique optical and electrical properties.

ACS POLYMERS AU (2021)

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Review Chemistry, Multidisciplinary

Radical photoinitiation with LEDs and applications in the 3D printing of composites

Yijun Zhang et al.

Summary: This review discusses the radical initiation upon LED light irradiation and its application in additive manufacturing, with a focus on the benefits of 3D printing through photopolymerization technology. It also provides an overview of the development of 3D printing of composites through photopolymerization, highlighting the challenges related to light penetration in filled matrices and discussing popular applications of 3D printing in various fields.

CHEMICAL SOCIETY REVIEWS (2021)

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Article Chemistry, Multidisciplinary

Porous 2D and 3D Covalent Organic Frameworks with Dimensionality-Dependent Photocatalytic Activity in Promoting Radical RingOpening Polymerization

Kaixuan Wang et al.

Summary: Dimensionality plays a crucial role in modulating the photocatalytic performances of covalent organic frameworks (COFs), with 2D-PN COFs exhibiting higher catalytic activity than 3D-PN COFs. The improved performance of 2D-PN COFs can be attributed to their larger internal surface area, more catalytically active sites, higher photosensitizing ability, and higher photoinduced electron transfer efficiency.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Article Chemistry, Multidisciplinary

Multifunctional Antimicrobial Biometallohydrogels Based on Amino Acid Coordinated Self-Assembly

Jingwen Song et al.

SMALL (2020)

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Aldehydes as powerful initiators for photochemical transformations

Maria A. Theodoropoulou et al.

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ACS APPLIED POLYMER MATERIALS (2020)

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Pectin-bioactive glass self-gelling, injectable composites with high antibacterial activity

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CARBOHYDRATE POLYMERS (2019)

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Dual-Responsive Photocatalytic Polymer Nanogels

Calum T. J. Ferguson et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2019)

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A versatile cyclic dipeptide hydrogelator: Self-assembly and rheology in various physiological conditions

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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2019)

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Glutathione-Functionalized Magnetic Covalent Organic Framework Microspheres with Size Exclusion for Endogenous Glycopeptide Recognition in Human Saliva

Bin Luo et al.

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Nanoscale Covalent Organic Framework for Combinatorial Antitumor Photodynamic and Photothermal Therapy

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Size-Controllable Synthesis of Uniform Spherical Covalent Organic Frameworks at Room Temperature for Highly Efficient and Selective Enrichment of Hydrophobic Peptides

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Photo-Induced Hydrogel Formation Based on g-C3N4 Nanosheets with Self-Cross-Linked 3D Framework for UV Protection Application

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Heteroatom-Doped Carbon Dots (CDs) as a Class of Metal-Free Photocatalysts for PET-RAFT Polymerization under Visible Light and Sunlight

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Carbon nitride nanosheets as visible light photocatalytic initiators and crosslinkers for hydrogels with thermoresponsive turbidity

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Covalent Organic Frameworks as Efficient Photoinitiators and Cross-Linkers To Fabricate Highly Stretchable Hydrogels

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