Korean Journal of Materials Research
·
2024
·Vol. 34
·期 9
·422-431
·
IF 0.3
Shu Ye,Jing Cheng,Zeda Meng,Won-Chun Oh
Hydrothermal and ultrasonic processes were used in this study to synthesize a single-atom Cu anchored on t-BaTiO3. The resulting material effectively employs vibration energy for the piezoelectric (PE) catalytic degradation of pollutants. The phase and microstructure of the sample were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), and it was found that the sample had a tetragonal perovskite structure with uniform grain size. The nanomaterial achieved a considerable increase in tetracycline degradation rate (approximately 95 % within 7 h) when subjected to mechanical vibration. In contrast, pure BaTiO3 demonstrated a degradation rate of 56.7 %. A significant number of piezo-induced negative charge carriers, electrons, can leak out to the Cu-doped BaTiO3 interface due to Cu's exceptional conductivity. As a result, a single-atom Cu catalyst can facilitate the separation of these electrons, resulting in synergistic catalysis. By demonstrating a viable approach for improving ultrasonic and PE materials this research highlights the benefits of combining ultrasonic technology and the PE effect.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Keran Lv,Rui Tu,Lihui Xiao,Wei Wei,Yuchun Xu,Guoqing Ren,Rong Huang,Weiqiao Deng,Tie Yu
A mechano-catalysis approach is introduced into “heterogeneously catalyzed gas phase reaction” with continuous gas flow, and Ruthenium (Ru) doped Nickel (Ni) milling balls (Ru/Ni) serve as CO 2 methanation catalyst. Under mechanical vibration conditions, Ru/Ni presented a state-of-the-art TOF CH4 of 15995.6 h −1 and higher CH 4 selectivity (>95%) at 340 ∼ 390 ℃. Compared with conventional Ru-Ni/Al 2 O 3 catalyst, Ru/Ni also exhibited intact Ru-Ni structure without deactivation and coke formation over 200 hrs. The surface and spatial distribution of Ru species on Ni substrate were studied by XRD, SEM, XPS, TOF-SIMS and XANES . In situ DRIFTs were also conducted to examine the reaction intermediates and boosting impact of Ru species on hydrogenation ability, and the advantages of mechanical vibration reactor for CO 2 methanation are proposed finally. This work pioneers a new idea for low energy consumption and high efficiency CO 2 hydrogenation.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 8
·4280-4291
·
IF 11.9
Ya Liu,Wangshu Tong,Wanting Song,Tingting Cao,Yulun Liu,Lingchao Wang,Zhihao Wang,Yihe Zhang
Piezocatalysis can be used to harvest widely existing and renewable mechanical vibrations in the environment to convert mechanical energy into chemical energy, which is employed in various important applications, and typically, the polyvinylidene fluoride (PVDF)/graphene composite piezocatalyst is used because of its recyclability, flexibility, and easy preparation. However, its poor piezocatalytic performance, primarily attributed to the wrapped graphene in the PVDF matrix that prevents the generated charges from fully accessing pollutants, remains a challenge. Herein, we use phase conversion and the “self-assembly strategy” to prepare a sandwich film called PVDF-hexafluoropropylene@reduced graphene oxide (PVDF-HFP@rGO) with PVDF-HFP as the interlayer and rGO as the outer layer to fully expose rGO. Under magnetic stirring at 600 rpm, the degradation efficiency of PVDF-HFP@rGO toward methylene blue reaches ∼98% within 60 min, higher than those of the traditional composite film (∼75%) and pure PVDF-HFP film (∼8.0%). The charge supply by rGO, piezoelectric field provision by PVDF-HFP, and advantage of the sandwich structure are verified through contrast experiments under different conditions such as changing rGO band structures, varying PVDF-HFP interlayer thicknesses, and using different layer structures, respectively. Therefore, the enhanced piezocatalytic performance of the sandwich structure provides new insights into the structural design of high-performance PVDF/graphene composite piezocatalysts.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Research
·
2025
·
IF 10.7
Ding Zhao,Yihan Li,Lei Xiang,Qimanguli Saiding,Zhiqi Lin,Zhengwei Cai,Juan Wang,Wenguo Cui
Chronic mechanical vibrations and endoplasmic reticulum (ER) stress are major contributors to osteoarthritis (OA) progression. This study proposes a novel “cellular shock absorption” approach by developing viscoelastic hydrogel microspheres with tunable stress relaxation properties. By modulating the chemical bonds in the hydrogel network through oxidation and hydrazine coupling reaction, hydrogel microspheres capable of absorbing shock and reducing mechanical stimulus-induced ER stress in chondrocytes are created. Cationic liposomes, modified with the cartilage-targeting peptide Wyrgrl and loaded with tauroursodeoxycholic acid (TUDCA), are encapsulated within these hydrogel microspheres. The microspheres not only dissipate intra-articular impact forces, reducing vibration and pressure transmission, but also provide sustained release of TUDCA, alleviating ER stress and slowing OA progression. In vitro studies showed that the stress relaxation time constant (τ) of the microspheres was tuned to 23.81 s, closely resembling the mechanical properties of the cartilage matrix. This property, combined with targeted TUDCA delivery, reduced Grp78 and CHOP expression, alleviating ER stress and inhibiting chondrocyte apoptosis. In vivo, the microspheres preserved joint cartilage structure, suppressed ER stress responses, and substantially delayed OA progression. This strategy presents a promising approach to mitigating cartilage damage and delaying OA by reducing mechanical stress and alleviating ER stress.
研究领域:
生物医学工程
·
材料科学
·
细胞生物学
·
药剂学
·
骨科
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）