POLYMER TESTING
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2024
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IF 5
Yingfan Zhang,Zhengyong Huang,Run He,Teng Zhao,Chenxin Li,Jian Li
The sustainability and additive manufacturing of dielectric insulators are the development direction of the power system. Introducing dynamic covalent bonds in light-based 3D printing have attracted considerable attention as the reversible crosslinks allow for the reprocessing of printed objects. However, there generally exists a trade-off between mechanical strength, glass transition temperature (T g ), and reconfigurability for dynamic covalent networks. The reconfiguring process of the dynamic covalent network often requires high mobility of molecular chains and large free volumes, which in turn decreases the mechanical strength, T g , and electrical insulating performance. Herein, we demonstrate a novel strategy for developing a kind of mechanically robust and sustainable vitrimer by building a rigid-flexible coupling inter-penetration network (IPN). Specifically, a two-stage curing approach was used to prepare high-performance 3D-printing vitrimers by using the plant oil-epoxy hybrid resin, which brings a lot of ester bonds and β -hydroxyl ester for the crosslinking network. Computational techniques with molecular dynamics calculation are used for the design and optimization of the crosslinking network, and then the optimized IPN is prepared by digital light processing 3D printing and subsequent heat curing. In the IPN, the epoxy backbone is rigid to enhance the T g and tensile strength, while the plant-based methacrylate is flexible to guarantee topological rearrangement at elevated temperatures. Compared to reported epoxy vitrimers, the resultant IPN exhibits simultaneous high T g (111 °C), outstanding tensile strength and toughness (tensile strength of 70 MPa, elongation at break of 17.58 %), good topological rearrangement, and excellent dielectric properties (permittivity less than 4, breakdown strength of 49.3 kV/mm). This work provides a new strategy for balancing the strength, toughness, electrical insulating and sustainability of 3D-printed thermosets.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yibo Song,Guowu Zhan,Shu-Feng Zhou
Cuproptosis, a newly discovered cell death pathway, has shown great potential in cancer treatment. Herein, near-infrared (NIR) light-driven nanomotors (CuSiO 3 @Au-Pd NMs) are designed for cuproptosis-assisted synergistic therapy with autonomous mobility and improved cellular uptake and tumor penetration. Specifically, the released Cu 2+ ions from CuSiO 3 @Au-Pd NMs can induce the Fenton-like reaction, leading to the generation of hydroxyl radicals (·OH), accompanied by the depletion of glutathione within the MCF-7 cells. Additionally, the designed CuSiO 3 @Au-Pd NMs also exhibit excellent photothermal effects, which can further promote the production of ·OH, resulting in intensified oxidative stress and cellular apoptosis. Moreover, the enhanced tumor permeation efficiency and cellular uptake of CuSiO 3 @Au-Pd NMs via autonomous movement under self-thermophoretic forces are proved using 2D cellular experiments and 3D multicellular tumor spheroids. The resultant intracellular accumulation of Cu 2+ can induce the oligomerization of lipoylated proteins, leading to cuproptosis, along with the mitochondrial dysfunction pathway. More importantly, both in vitro and in vivo experiments show that CuSiO 3 @Au-Pd NMs could penetrate deeply into tumors and exhibit great anticancer efficacy through multimodal therapeutic methods. These findings manifest promising potentials of NIR-powered Cu-based NMs with high maneuverability for future smart and synergistic cancer therapy.
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OPTICAL MATERIALS
·
2025
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IF 4.2
Ye Chen,Zunxian Yang,Jiaxiang Wang,Hui Zhang,Yue Chen,Xudong Jiang,Yuting Bai,Jiajie Hong,Benfang Liu,Zheyu Zhou,Runsen Yu,Zhezhou Fang,Jinzhu Gao,Xuanyao Song,Zhiyu Yuan,Tailiang Guo,Fushan Li,Yongyi Chen,Zhenzhen Weng
Quantum dot (QD) based light-emitting diode devices (QLEDs) attracted significant academic interest due to their outstanding color saturation and convenient solution-based manufacturing processes. Currently, the external quantum efficiency (EQE) of red, green, and blue QLEDs reached their own theoretical limits. However, there was still a common phenomenon of roll-off existed in QLEDs. In this work, QLEDs with an ultra low roll-off were realized via simple carrier injection regulation strategy in achieving carrier recombination balance and exhibited excellent repeatability. By modifying quantum dots and electron transport layer (ETL), the champion device with the peak EQE of 15.2 %, and a current efficiency (CE) of 63.4 cd/A was successfully fabricated, which were 1.9 and 2.0 times greater than those of the control devices, respectively. The devices delivered a peak brightness of 266,778 cd/m 2 , and the EQE remained at 15.0 % at a brightness of 50,000 cd/m 2 , staying above 14 % within the range of 3000 to 200,000 cd/m 2 . At a voltage of 10 V, the peak EQE of the optimized devices decreased by only 7.6 % when compared with their optimum value of EQEs, while the EQE of the control device declined by 26.6 %. Finally, analysis of 40 different batches of devices revealed an average EQE of 14.3 %, demonstrating that this strategy exhibited good repeatability. This approach provided a convenient means to regulate carrier injection and further elucidated the relationship between roll-off and carrier injection balance in QLEDs, proposing a strategy to enhance their performance and simultaneously mitigate roll-off.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Congcong Pei,Aaron Albert Aryee,Keke Zhu,Rong Wang,Runping Han
Treatment of colored effluent is necessary for the textile industry. In this study, a magnetically recyclable composite (MnFe 2 O 4 @cCNTs-PEI) was prepared by coprecipitation and grafting methods, and its efficiency for removal of light green SF (LG) from solution assessed via the adsorption and advanced oxidation techniques. The experimental results indicated that the maximum adsorption capacity of MnFe 2 O 4 @cCNTs-PEI towards LG could reach 371 mg‧g −1 at solution pH 3 and 303 K. The adsorption equilibrium results could be well fitted by Koble-Corrigan, Temkin, and Freundlich isotherm models whereas the adsorption kinetic process follows the Elovich equation and Double Constant model. This implies the adsorption process be heterogeneous multimolecular layer adsorption, accompanied by heterogeneous diffusion. The adsorption process was spontaneous, endothermic and entropy increasing which was majorly controlled by the electrostatic attraction and π-π stacking mechanisms. MnFe 2 O 4 @cCNTs-PEI can catalyze and activate H 2 O 2 to achieve a heterogeneous Fenton-like degradation of LG. MnFe 2 O 4 @cCNTs-PEI as a catalyst could achieve a higher removal rate of LG (90 %) within a broad pH range (3–10) which could be ascribed to the presence of active radical species such as ‧OH and 1 O 2 . After three adsorption and degradation regeneration cycles, the removal rate of LG was still higher than 60 %. It is potential for MnFe 2 O 4 @cCNTs-PEI to be economically viable for practical applications.
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Journal of Natural Gas Chemistry
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2011
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IF 1.345
Huiling Li,Yonggen Lei,Ying Huang,Yueping Fang,Yuehua Xu,Li Zhu,Xin Li
The Cu 2 O/SiC photocatalyst was obtained from SiC nanoparticles (NPs) modified by Cu 2 O. Their photocatalytic activities for reducing CO 2 to CH 3 OH under visible light irradiation have been investigated. The results indicated that besides a small quantity of 6H-SiC, SiC NPs mainly consisted of 3C-SiC. The band gaps of SiC and Cu 2 O were estimated to be about 1.95 and 2.23 eV from UV-Vis spectra, respectively. The Cu 2 O modification can enhance the photocatalytic performance of SiC NPs, and the largest yields of methanol on SiC, Cu 2 O and Cu 2 O/SiC photocatalysts under visible light irradiation were 153, 104 and 191 μmol/g, respectively.
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Nature Photonics
·
2024
·
IF 32.3
Zhou Yang,Guo Zhengfeng,Gu Honggang,Li Yanqiang,Song Yipeng,Liu Shiyuan,Hong Maochun,Zhao Sangen,Luo Junhua
Optical anisotropy, a spatially asymmetric light–matter interaction that manifests itself as birefringence and dichroism, is paramount for manipulating light polarization in modern optics. So far, various natural birefringent crystals are widely used, but their birefringence is limited to <0.3. Here we demonstrate a solution-processable natural crystal C 3 H 8 N 6 I 6 ·3H 2 O with giant birefringence up to 2.8 within the visible to infrared spectral region. Combining critical point analysis and the first-principles calculations, we reveal that this giant optical anisotropy mainly comes from the linear (I 3 ) − structural units in a parallel arrangement, which maximizes the difference of polarizability along the different crystallographic axes. This work highlights the potential of natural polyiodide crystals as an outstanding platform to satisfy the increasing demand for photonic applications that exploit polarization in optical communication, three-dimensional imaging, ultrahigh-resolution sensing and other tasks.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Xuemeng Xia,Jian Meng,Jingjing Qin,Guozheng Yang,Pengyang Xuan,Yunpeng Huang,Wei Fan,Yao Gu,Feili Lai,Tianxi Liu
Inspired by natural organisms, a four-dimensional (4D)-printed starfish-like bionic soft robot (SBSR) was effectively prepared by integrating three-dimensional (3D) printing with smart hydrogels. The body of the SBSR is composed of a reduced graphene oxide-poly(N-isopropylacrylamide) hydrogel (rGO-PNH) with superior mechanical properties. In addition, the enhanced photothermal conversion effect was obtained by the reduction of graphene oxide nanosheets after the 3D printing process. Cylindrical actuators prepared using rGO-PNH exhibited bending and orientation toward the light source within 20 s of exposure to near-infrared light, thus demonstrating the rapid photoresponsivity of rGO-PNH. Furthermore, the 4D-printed SBSR showcased effective grasping, lifting, and releasing of objects by mimicking the predatory behavior of starfish. This study would provide insights into the development of responsive materials in 4D printable bionic soft robots and their applications in areas such as biomimetic devices and artificial muscles.
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Nano Today
·
2024
·
IF 13.2
Fan Dong,Yunhang Liu,Huihua Dong,Xing Sun,Bolong Xu,Qingyuan Wu,Xican Xu,Yong Jiang,Huiyu Liu,Yuguang Wang
Using nanomaterials with photodynamic therapy (PDT) to combat bacterial infections including periodontal infections has attracted the attention of researchers because of their high efficiency, simplicity and low susceptibility to drug resistance. However, the therapeutic effectiveness is threatened by the endogenous accumulation of hydrogen peroxide and insufficient amounts of the substrate oxygen. Here, we report a microporous Zr porphyrin carboxylate metal-organic framework (MOF) PCN-222 doped with platinum nanozymes, Pt@PCN-222, to reshape the microenvironment that is not conducive to the recovery of infected tissue and further promote recovery after periodontal tissue infection. This MOFdoped with platinum nanozymes can remove excessive endogenous hydrogen peroxide and produce dissolved oxygen simultaneously. This framework can effectively alleviate anaerobic bacterial infection in periodontal tissue, including efficiently killing the bacteria and reducing the level of inflammation in tissue. This work provides a new strategy to solve the long-term clinical challenge of anaerobic bacterial infections in periodontal tissue and proposes an innovative approach to improve treatment.
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Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 15
·4711-4720
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IF 6.1
Zhexuan Gao,Yi Zhang,Yinyan Li,Shilong Zhao,Peng Zhang,Xiaolong Dong,Degang Deng,Shiqing Xu
The second near-infrared window (NIR-II, 1000–1700 nm) emitting phosphor is a key component for the phosphor-converted light-emitting diode (pc-LED), which has garnered significant attention. However, it remains a major challenge to discover efficient NIR-II broadband phosphors that can be excited by blue LEDs. Herein, Cr3+ and Ni2+ ions were co-doped into the Li2ZnSn3O8 (LZSO) host. LZSO:Cr3+,Ni2+ phosphor achieves a broadband NIR-II emission peak at 1465 nm with a large full width at half maximum (FWHM) of 300 nm and internal quantum efficiency (IQE) of 43.31% under excitation at 426 nm because of the efficient energy transfer (ET) from Cr3+ to Ni2+. In addition, a dual-emissive doped phosphor across the NIR-I (700–1000 nm) and NIR-II regions with a higher sensitivity at physiological temperatures was obtained. The relative sensitivity value (Sr) reaches 1.44% K−1 at 293 K, indicating that the LZSO:Cr3+,Ni2+ phosphor is a potential candidate for NIR optical thermometers in biotechnological applications. The manufactured NIR-II pc LED provides a radiative flux of 8.26 mW with a photoelectric conversion efficiency of 2.71% at a drive current of 100 mA and has promising potential in night vision, medical imaging, and spectral analysis applications.
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Advanced Optical Materials
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2025
·
IF 7.2
Si-Jie Li,Xiongkai Tang,Chiu Hwi Ng,Jia Yang Lim,Wai Kit Tang,Wen-Cheng Chen,Yanping Huo,Maggie Ng,Season Si Chen,Dongdong Zhang,Lian Duan,Man-Chung Tang
Improving operational stability for organic light-emitting diode (OLED) is a hotspot in scientific research. It is proposed that silicon (Si) and germanium (Ge) can exhibit hyperconjugation effects and participate in conjugated systems, thereby stabilizing molecules’ excited and polarized states. Herein, the importance of incorporating Si and Ge in multi-resonance thermally activated delayed fluorescence emitters is revealed to improve their luminescence efficiency and intrinsic stability. Computational studies show that introducing Si and Ge atoms can strengthen the C−Si and C−Ge bonds due to the hyperconjugation effect, resulting in higher bond dissociation energies and molecular photostability. With the efficient spin-vibronic coupling and spin-orbital coupling, the flexible conformations of the emitters facilitate the spin-flip processes by enriching the characters and density of their excited states. A maximum external quantum efficiency of 30.0% for BN -Ge -based blue-emitting OLEDs, with (Commission Internationale de l'Eclairage) CIE y ≤ 0.18 is realized. In particular, the LT 90 at 1000 cd m −2 of 48.3 and 7.1 h is achieved for BN-Si -based and BN-Ge -based OLEDs, respectively, using the developed deuterated SiCzCz-d 15 and SiTriCz2-d 16 as the hole-transporting and host materials. It is anticipated that the study will provide insights into the design of group IV element-containing multiple-resonance thermally activated delayed fluorescent emitters for optoelectronics applications.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chong He,Yang Xiao,Sheng Wang,Huanjun Lu,Xiaohong Li,Lin Xu,Chao Wang,Yingfeng Tu
The stimulus-responsive polymeric materials have attracted great research interest, especially those remotely manipulated materials with potential applications in actuators and soft robotics. Here we report a photoresponsive main-chain actuator based on azobenzene poly(ether ester) multiblock copolymer (mBCP) thermoplastic elastomers, (PTAD-b-PTMO-b-PTAD)n, which were synthesized by a cascade polycondensation-coupling ring-opening polymerization method using poly(tetramethylene oxide) (PTMO) and azobenzene-containing cyclic oligoesters (COTADs) as monomers. The thermal, mechanical, and microphase separation behaviors of mBCPs could be flexibly tuned by altering the ratios of soft-to-hard segments and block number (n). The oriented azobenzene mBCP fibers were prepared by melt spinning, showing reversible photoresponsive properties with remarkably high strength (∼1000 MPa) and high elongation at break comparable to spider silks. Fast photoinduced bending and contraction were successfully achieved in these fibers with high work and power densities and energy conversion efficiency, enabling it to lift up about 250 times of its own weight. Moreover, it can take out materials inside the tube by UV-light control. These fibers could be applied in light-driven actuators or telecontrolled robot arms.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jian Yang,Haojie Yu,Li Wang,Xiaowei Liu,Yudi Huang,Yichuan Hong,Shuning Ren
Infected wound management is a great challenge to healthcare, especially in emergencies such as accidents or battlefields. Hydrogels as wound dressings can replace or supplement traditional wound treatment strategies, such as bandages or sutures. It is significant to develop novel hydrogel-based wound dressings with simple operation, inexpensive, easy debridement, effective antibacterial, biocompatibility, etc. Here, we designed a novel gelatin-based hydrogel wound dressing Gel-TA-Fe 3+ . The hydrogels used tannic-modified gelatin as the main body and Fe 3+ as the crosslinking agent to achieve a controllable rapid sol-gel transition. The hydrogels exhibited tough mechanical properties, excellent antibacterial ability, biocompatibility and an acceptable temperature response to near-infrared light (NIR). Moreover, the hydrogels could promote the healing process of MRSA -infected skin wound in rats. This multifunctional hydrogel was thought to have potential for emergency treatment of bacterial infected wound.
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