DENTAL MATERIALS
·
2024
·
IF 4.6
Qiuyi Li,Yongzhe Liu,Delu Zhao,Yupu Yang,Qibo Liu,Yujun Zhang,Junling Wu,Zheqin Dong
Objective Stress concentration and excessive wear on the opposite jaw teeth are the main problems that lead to the failure of all-ceramic crown restoration. The objectives of this study were to: (1) Synthesize the biomimetic gradient zirconia/resin composites. (2) Control the porosity and structure so that the mechanical properties of the biomimetic gradient zirconia/resin composites are close to enamel and dentin. Methods Biomimetic uniform zirconia scaffolds with different widths (1.6 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.2 mm) and Biomimetic gradient (1.6 mm-2.2 mm) zirconia scaffolds were designed using 3DMax and Magics, fabricated by digital light processing 3D printing, and then infiltrated into dental resin for mechanical testing, finite element simulation and cytotoxicity testing. Results Results show that the ceramic-polymer composites exhibit a significant enhancement in strength (1.37-fold increase) and toughness (2.08-fold increase) compared to zirconia ceramic scaffold (P < 0.05), highlighting the effectiveness of our structural design. In addition, the gradient design further improves the mechanical strength of the composites. Notably, the gradient composite crown exhibits a bending strength of 138.3 (±16.7) MPa, a toughness of 9.0 (±0.5) MJ/m³, and a compressive strength of 113.7 (±2.6) MPa, values that are comparable to those of natural enamel and dentin, and shows good biosafety. Conclusion Biomimetic gradient zirconia/dental resin materials were precisely fabricated through a series of studies, which is expected to further improve the clinical treatment effect. At the same time, the strategic design also provides new ideas for the performance improvement of other dental materials. Significance Gradient zirconia/resin composite materials with mechanical properties matching natural teeth were precisely fabricated, and are expected to significantly improve clinical treatment outcomes. Additionally, the strategic design provides new insights for enhancing the performance of other dental materials.
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International Journal of Extreme Manufacturing
·
2025
·Vol. 7
·期 3
·035003
·
IF 21.3
Guangbin Zhao,Yanlong Wu,Bochen Li,Hang Tian,Bo Li,Xiao Li,Xu Chen,Tao Zhou,Yaning Wang,Yichao Gong,Dingchang Hou,Yaxiong Liu,Xuewen Zong,Bingheng Lu
Porous metals fabricated via three-dimensional (3D) printing have attracted extensive attention in many fields owing to their open pores and customization potential. However, dense internal structures produced by the powder bed fusion technique fails to meet the feature of porous materials in scenarios that demand large specific surface areas. Herein, we propose a strategy for 3D printing of titanium scaffolds featuring multiscale porous internal structures via powder modification and digital light processing (DLP). After modification, the titanium powders were composited with acrylic resin and maintained spherical shapes. Compared with the raw powder slurries, the modified powder slurries exhibited higher stability and preferable curing characteristics, and the depth sensitivity of the modified powder slurries with 45 vol% solid loading increased by approximately 72%. Green scaffolds were subsequently printed from the slurries with a solid loading reaching 45 vol% via DLP 3D printing. The scaffolds had macropores (pore diameters of approximately 1 mm) and internal open micropores (pore diameters of approximately 5.7–13.0 μm) after sintering. Additionally, these small-featured (approximately 320 μm) scaffolds retained sufficient compressive strength ((70.01 ± 3.53) MPa) even with high porosity (approximately 73.95%). This work can facilitate the fabrication of multiscale porous metal scaffolds with high solid loading slurries, offering potential for applications requiring high specific surface area ratios.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Jingwen Yao,Yuling Huang,Haifeng Sun,Zhiyu Wang,Jie Xue,Zhifeng Huang,Shou-Cheng Dong,Xihan Chen,Haipeng Lu
Spin light-emitting diodes (spin-LEDs) are important for spin-based electronic circuits as they convert the carrier spin information to optical polarization. Recently, chiral-induced spin selectivity (CISS) has emerged as a new paradigm to enable spin-LED as it does not require any magnetic components and operates at room temperature. However, CISS-enabled spin-LED with tunable wavelengths ranging from red to near-infrared (NIR) has yet to be demonstrated. Here, chiral quasi-2D perovskites are developed to fabricate efficient spin-LEDs with tunable wavelengths from red to NIR region by tuning the halide composition. The optimized chiral perovskite films exhibit efficient circularly polarized luminescence from 675 to 788 nm, with a photoluminescence quantum yield (PLQY) exceeding 86% and a dissymmetry factor ( g lum ) ranging from 8.5 × 10 −3 to 2.6 × 10 −2 . More importantly, direct circularly polarized electroluminescence (CPEL) is achieved at room temperature in spin-LEDs. This work demonstrated efficient red and NIR spin-LEDs with the highest external quantum efficiency (EQE) reaching 12.4% and the electroluminescence (EL) dissymmetry factors ( g EL ) ranging from 3.7 × 10 −3 to 1.48 × 10 −2 at room temperature. The composition-dependent CPEL performance is further attributed to the prolonged spin lifetime as revealed by ultrafast transient absorption spectroscopy.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yi Yu,Zelin Li,Wei Zhou,Wei Lu,Shuxin Wei,Tao Chen
Rewritable luminescent materials are attracting widespread attention for information storage and display as they can help to reduce environmental wastes caused by the abuse of single-use and transient systems. Nevertheless, since most reported systems are chemical-stimuli-responsive and single-stimuli-responsive, it remains challenging to achieve the rewritable and programmable display of multiple information in one single system, which is essential to enhance information richness and display intelligence. In this work, an ideal kind of multi-responsive soft luminescent display systems are reported, which consist of heat/humidity-responsive fluorescence-phosphorescence dual-emission film and stacked graphene assembly (SGA) film by using thin poly (dimethyl siloxane) (PDMS) as middle connecting layer. In such multilayer structure, the heat generated by electricity connection or light illumination of bottom SGA film can be instantly transferred across the middle PDMS layer to cause heat-triggered red-to-blue emission color change, or to evaporate water for blue-to-red emission color recovery. Owing to the “residual-free” nature of these electricity, light and water stimuli, multi-responsive rewritability is guaranteed to enable the reversible writing and complete erasure of various letter/pattern information. On this basis, robust electricity/light-heat-hygro multi-responsive soft luminescent display systems are demonstrated, in which diverse letter/pattern information could be facilely programmed to be successively displayed and then completely reset to enable another data writing/erasing cycle by sequential modulation of different environmental stimuli. This study brings programmable merit for rewritable luminescent display systems and is expected to inspire more intelligent ones.
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Energy & Environmental Science
·
2024
·Vol. 17
·期 8
·2945-2955
·
IF 32.4
Binyang Tuo,Ziyu Wang,Ziqiu Ren,Hanwen Zhang,Xinqi Lu,Yiqiang Zhang,Shuangquan Zang,Yanlin Song
The stability issues of perovskite solar cells (PSCs), especially illumination stability, have become a bottleneck that limits their further development, which needs urgent attention. Herein, we present a novel strategy for enhancing the illumination stability of PSCs using the radical scavenger of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) to interrupt photoinduced radical decomposition. It is demonstrated that selectively generated triiodide with the addition of TEMPO can obliterate I-deficient phases during crystallization and passivate defects. More importantly, the photochemical decomposition of targeted perovskite polycrystalline films has been observably inhibited by the free-radical elimination effect of TEMPO. By harnessing TEMPO's defect passivation and radical-scavenging effects, target perovskite devices achieve an outstanding power conversion efficiency of 25.03%, maintaining over 90% of their initial efficiency after continuous maximum power point tracking under ISOS-L-2 conditions at 65 °C for 1000 hours. We demonstrate a novel perspective on the management of photochemical behavior in perovskite devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zeshuang Kong,Ruiqi Zhang,Jixian Dong,Jiahui Yu,Dafeng Zhang,Junchang Liu,Peiqing Cai,Xipeng Pu
With the increasing needs of people for a better life, the problem of water resources pollution has attracted wide attention. The construction of p-n heterojunction is an effective strategy to promote the removal of pollutants by photocatalysts. In this work, a series of BiOBr/Cu 2 S heterojunction photocatalysts with mass ratios of Cu 2 S have been synthesized successfully by a hydrothermal method combined with grinding method for photocatalytic degradation of tetracycline (TC) and ciprofloxacin (CIP). The results showed that BiOBr/Cu 2 S exhibited superior photodegradation efficiency of TC and ciprofloxacin CIP than BiOBr and Cu 2 S monomers. When the mass ratio of Cu 2 S is 0.15 %, the visible degradation of CIP and TC are 79.2 % in 90 min and 88.5% in 60 min. In addition, the effects of different inorganic ions and pH value on the photocatalytic performance of BiOBr/Cu 2 S were investigated. It was proved that superoxide free radical (•O 2 - ) was the main active species by free radical trapping experiment. The photocatalytic degradation process was further evaluated by total organic carbon and mass spectrometry tests. This work provides a feasible construction strategy for photocatalysts with potential application in water resources pollutants.
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Nature Electronics
·
2025
·
IF 40.9
Lu Xiuyuan,Deng Yunzhou,He Siyu,Zhu Xitong,Zelewski Szymon J.,Wang Hao,Ren Aobo,Zhou Xiangyu,Wu Jiang,Li Xiang,Zeng Jiejun,Dai Xingliang,Shen Qibin,Chen Desui,Penty Richard V.,Friend Richard H.,Jin Yizheng
Fast-response electroluminescent devices are crucial for optoelectronic applications that involve high-speed operations. Quantum-dot light-emitting diodes are solution-processed electroluminescent devices with high efficiencies and stabilities, and they are of potential use in such applications. However, their response speed is typically limited by slow charge injection and transport across the organic hole-transport layers. We show that the transient electroluminescent responses of quantum-dot light-emitting diodes are influenced by their excitation history in pulsed operations. As the pulse interval decreases, this results in an increased response speed and the emergence of another fast-response electroluminescent channel, indicating the presence of excitation-memory effects. We show that these dynamics are due to deep-level hole traps in the organic hole-transport layers with fast charge-trapping and slow charge-detrapping characteristics. We develop a low-capacitance micro-quantum-dot light-emitting diode that exploits the excitation-memory-induced fast-response channel. The device, which has a −3 dB bandwidth of up to 19 MHz, exhibits an electroluminescent modulation frequency of 100 MHz and data-transmission rates of up to 120 Mbps with sub-picojoule energy consumption.
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Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 15
·4711-4720
·
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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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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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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Journal of Natural Gas Chemistry
·
2011
·
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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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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