Jian Li

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Academic Career Length

18Years (2009-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

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13 November 2019 in Angewandte Chemie International Edition

Journal Article

Carbon Dots as a Promising Green Photocatalyst for Free Radical and ATRP‐Based Radical Photopolymerization with Blue LEDs

Carbon dots (CDs) have been used for the first time as a sensitizer to initiate and activate free radical and controlled radical polymerization, respectively, based on an ATRP protocol with blue LEDs. Consideration of diverse heteroatom‐doped CDs indicated that N‐doped CDs could serve as an effective photocatalyst and photosensitizer in combination with LEDs emitting either at 405 nm or 470 nm. Free radical polymerization was initiated by combining the CDs with an iodonium or sulfonium salt in tri(propylene glycol) diacrylate. Polymerization of methyl methacrylate (MMA) by photo‐induced ATRP was achieved with CDs and ethyl α‐bromophenylacetate using Cu^II as catalyst in the ppm range. The polymers obtained showed temporal control, narrower dispersity ≲1.5, and chain‐end fidelity. The first‐order kinetics and ON/OFF experiments additionally gave evidence of the constant concentration of polymer radicals. No remarkable cytotoxic activity was observed for the CDs, underlining their biocompatibility.

11 February 2021 in Angewandte Chemie International Edition

Journal Article

Distinct Sustainable Carbon Nanodots Enable Free Radical Photopolymerization, Photo‐ATRP and Photo‐CuAAC Chemistry

Carbon nanodots (CDs) originating from different biomass result in different activities to sensitize photo‐ATRP and photo‐CuAAC reaction protocols with visible light. Free radical polymerization of tri(propylene glycol)diacrylate also exhibited a good efficiency using CDs in combination with an iodonium salt employing LEDs emitting either at 405 nm, 525 nm or 660 nm. Photo‐ATRP experiments confirmed controlled polymerization conditions using Cu^II at the ppm scale resulting in dispersities between 1.06 to 1.10. Chain end fidelity was successfully provided by chain extension and block copolymerization additionally approving the living feature of polymerization using a CD synthesized from lac dye comprising olefinic moieties in the originating biomass. By global analysis, time resolved fluorescence measurements indicated the appearance of several emitting species contributing to the reactivity of the excited states. Different cytotoxic response appeared following the answer of MCF‐10A cells in a flow cytometry assay; that is 400 μg mL⁻¹. Thus, cell viability was greater 80 % in the case of CD‐2–CD‐5 while that of CD‐1 was close to 70 %.

30 December 2020 in Polymers

Journal Article

One-Step Synthesis of Eu³⁺-Modified Cellulose Acetate Film and Light Conversion Mechanism

A CA-Eu(III) complex was synthesized by the coordination reaction of cellulose acetate (CA) and Eu³⁺ to obtain a CA-Eu light conversion film. This product was then doped with Tb(III) to sensitize the luminescence of Eu³⁺, which could functionalize the CA film. FTIR and XPS showed that the oxygen atoms in C=O, C–O (O=C–O), and O–H were involved in the complexation with Eu³⁺ and formed a Eu–O bond. SEM revealed that Eu³⁺ filled in the pores of the CA film. By changing the experimental conditions, the best fluorescence performance was obtained at the CA: Eu³⁺ ratio of 3:1 with a reaction time of 65 min. The energy transfer between Tb³⁺–Eu³⁺ could be realized by doping Tb³⁺ to enhance the luminescence of Eu³⁺. The best fluorescence performance of the CA-Eu-Tb light conversion film was at a Eu³⁺:Tb³⁺ ratio of 3:1. Compared with the CA film, the light conversion film has high transparency, high tensile strength, and good flexibility. It can convert the ultraviolet light harmful to plants into red light that is beneficial to photosynthesis. This offers high efficiency and environmental protection in the field of agricultural films.

25 March 2024 in Angewandte Chemie International Edition

Journal Article

Light‐Mediated Polymerization Catalyzed by Carbon Nanomaterials

Carbon nanomaterials, specifically carbon dots and carbon nitrides, play a crucial role as heterogeneous photoinitiators in both radical and cationic polymerization processes. These recently introduced materials offer promising solutions to the limitations of current homogeneous systems, presenting a novel approach to photopolymerization. This review highlights the preparation and photocatalytic performance of these nanomaterials, emphasizing their application in various polymerization techniques, including photoinduced i) free radical, ii) RAFT, iii) ATRP, and iv) cationic photopolymerization. Additionally, it discusses their potential in addressing contemporary challenges and explores prospects in this field. Moreover, carbon nitrides, in particular, exhibit exceptional oxygen tolerance, underscoring their significance in radical polymerization processes and allowing their applications such as 3D printing, surface modification of coatings, and hydrogel engineering.

28 April 2023 in Angewandte Chemie International Edition

Journal Article

A Sustainable Wood‐Based Iron Photocatalyst for Multiple Uses with Sunlight: Water Treatment and Radical Photopolymerization

Xiaolin Guo

Xinpeng Zhao

A sustainable photocatalyst for use with multiple purpose comprising demethylated lignin (Fe₃O₄@D‐wood) was made by treatment of wood and iron oxide. Characterization followed by XRD, UV/Vis, photo‐current studies, and electrochemical measurements. This material became subject of photocatalytic explorations for water treatment and material synthesis by radical photopolymerization. Exposure of Fe₃O₄@D‐wood with artificial sunlight showed an improved activity considering photochemical oxidation of organic pollutants in the presence of H₂O₂. The efficient generation of reactive radicals brought this system also to photopolymerization. Here, radicals based on reactive oxygen species (ROS) generated in the catalytic cycle can be seen as the dominating species to initiate radical polymerization. A mixture of UDMA and TPGDA showed good reactivity with cumene hydroperoxide (CHP). Photocatalyst used for water treatment facilitates reuse for photopolymerization.

31 May 2024 in Journal of Colloid and Interface Science

Journal Article

Investigation of silicon doped carbon dots/Carboxymethyl cellulose gel platform with tunable afterglow and dynamic multistage anticounterfeiting

About Me

Jian Li, an expert in wood science and technology and doctoral supervisor, is the academic leader of wood science and technology. He graduated in 1966 from Northeast Forestry College, majoring in Chemical Engineering of Forest Products. From 1966 to 1978, he worked as an engineer and manager for paper production. From 1978 to 1987, he became a student again and obtained a master’s degree and then a Ph.D. From 1989 to 1990, he performed cooperative research at Wales University. He has been engaged in teaching and research in the field of wood science and technology since 1981. He is the president of Northeast Forestry University and director of Wood Science and Technology National Key Subject, Northeast Forestry University. He is also the president of the Wood Science Society of China Society of Forestry, director of the Forest Engineering Committee of the Ministry of Education, caller of the Subject Senate of the Academic Degree Committee of the State Council, and National Expert of Excellent Achievement. He has long been the leader of research and education in wood science and technology and has contributed much to the construction and development of the subject. As the subject advisor, he led his subject team in entering the National Key Subject. He has many achievements in wood protection and the biological and environmental characteristics of wood. In 2011, he became an academician of the Chinese Academy of Engineering.

Jian Li

Jian Li

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