Regenerative Biomaterials
·
2016
·Vol. 3
·期 5
·299-307
·
IF 0
Sun Hong-Ji,Wang Yan,Hao Tong,Wang Chang-Yong,Wang Qi-Yu,Jiang Xiao-Xia
Glutathione (GSH) depletion has been an important contributor to the dysfunction of dopamine neurons. Polyamidoamine-GSH (PAMAM-GSH) was synthesized and the delivery effect of GSH into PC12 cells was tested. MTT assessment for cytotoxicity and reactive oxygen species (ROS) as well as nitrite oxide (NO) and intracelluar superoxide dismutase (SOD) detection for antioxidative ability were performed. Furthermore, the antiapoptotic ability was analysed by assessing caspase-3, JNK1/2 and Erk1/2 expression. Our data indicated that PAMAM-GSH is an effective agent to replenish GSH into PC12 cells. PAMAM-GSH developed its antioxidative and protective ability for 1-methyl-4-phenylpyridinium (MPP)-induced PC12 cells by reducing the intracellular levels of ROS and SOD activity as well as decreasing the release of NO. Meanwhile, PAMAM-GSH could inhibit caspase-3 activation and might show its antiapoptotic ability to MPP-induced PC12 cells through JNK2/Erk1/2 pathway. In summary, these studies suggest that PAMAM-GSH conjugate has an intrinsic ability to penetrate PC12 cells and deliver GSH into these cells which may provide a new strategy for clinical applications in the treatment of Parkinson’s disease.
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Regenerative Biomaterials
·
2015
·Vol. 2
·期 2
·97-105
·
IF 0
Li Xiaomeng,Qin Jinli,Ma Jun
A silk fibroin/poly (vinyl alcohol) porous scaffold with a water vapor transmission rate of 2125 ± 464 g/m2/day has been developed via thermally induced phase separation (gelation) and freeze-drying process. A hierarchical architecture of micropores and nanofibers was observed inside the scaffolds, and the related structures were analyzed. The viability and proliferation of 3T3 fibroblasts were examined, which indicated that the scaffolds exerted low cytotoxicity. After loading curcumin, the scaffolds can suppress the growth of 3T3 fibroblasts. The release behavior of curcumin from the scaffolds was investigated. At pH = 7.2, the release profiles showed no significant difference for the loading amounts of 0.5 mg and 0.25 mg per sample. Meanwhile, the cumulative amount of released drug at pH = 5.7 was significantly more than that in neutral solution due to more degradation of the scaffolds. It was suggested that the silk fibroin/poly (vinyl alcohol) blend scaffolds could be potentially used as wound dressing materials.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 30
·9203-9210
·
IF 6.641
Y. Y. Zhou,E. H. Song,M. G. Brik,Y. J. Wang,T. Hu,Z. G. Xia,Q. Y. Zhang
Mn4+-doped fluoride red-emitting phosphors have been developed for backlighting white light-emitting diodes (WLEDs). However, the long fluorescence lifetime (τ > 5 ms) leads to the image-retention phenomenon for the human eye when Mn4+ is doped into equivalent X sites in A2XF6 (A = Na, K, Rb, Cs; X = Si, Ge, Ti, Zr). Herein, we report on novel red-emitting A2NaScF6:Mn4+ (A = K, Rb, Cs) (ANSF) phosphors with short fluorescence lifetimes (τ < 4 ms) and characteristic zero phonon line (ZPL) emission, which can be realized via non-equivalent doping of Mn4+ into Sc3+ sites. Density functional theory (DFT) calculations verified the formation of a slightly distorted environment of Mn4+ and an Na+ vacancy to balance the charge with Mn4+ non-equivalent doping. The WLED backlight using ANSF as a red-light component can reach a wide color gamut above 105% of the National Television Standards Committee (NTSC) standard, and the image-retention on the backlighted screen can be effectively avoided compared to the backlight obtained using commercial K2SiF6:Mn4+. Such a Mn4+ non-equivalent doping strategy opens a new perspective for the modification of local symmetry and enhancement of the luminescence properties of Mn4+-doped red-emitting fluoride phosphors.
研究领域:
材料科学
·
光学工程
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Nature Communications
·
2026
·
IF 18.1
Li Ling,Ning Shangbo,Cheng Fangqi,Chen Mingjun,San Xingyuan,Hu Zhuofeng,Gao Linjie,Tang Yuan,Hao Yuchen,Lv Cuncai,Li Yaguang,Ye Jinhua
Photothermal hydrogenation of CO 2 offers a solar-driven route to multicarbon hydrocarbons, but controlling carbide formation and maintaining reconstructed active sites remain challenging for iron-based catalysts. Here, we develop a trace Al/Rb co-promoted CuFe 2 O 4 catalyst that enables efficient and stable photothermal CO 2 hydrogenation to light olefin under ambient pressure. The optimized catalyst achieves high C 2 -C 4 olefin selectivity of approximately 63%, suppressing CH 4 selectivity and sustaining stable photothermal-catalytic performance for 200 h. Integrated experimental characterizations and theoretical calculations reveal that the CuFe 2 O 4 precursor undergoes reaction-induced reconstruction to form Cu-Fe 5 C 2 interfacial structures. Trace Al/Rb promotion facilitates the formation and stabilization of reconstructed metal–carbide interfaces, with Al regulating the Fe-centered coordination environment and carbide stability, while Rb tunes the interfacial electronic structure and adsorption–hydrogenation balance. This cooperative regulation stabilizes carbide-based interfacial active sites and promotes CO 2 -derived C 1 intermediates toward C–C coupling and C 2 -intermediate stabilization, thereby favoring C 2 -C 4 olefin formation.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Changjiang Shi,Haihua Zhang,Haolun Li,Hongbing Fu
Blue-green lasers are essential for next-generation optoelectronics. While GaN-InGaN lasers offer excellent performance, their complex fabrication and challenges in precise bandgap tuning remain significant limitations. Hybrid lead halide perovskites present a promising alternative, with tunable bandgaps and cost-effective solution processing. However, halide migration in these materials causes spectral instability and luminescence shifts under operational conditions. Here, a novel class of Rb-Cs alloyed quasi-2D perovskites is introduced that achieve both low amplified spontaneous emission (ASE) thresholds and exceptional spectral stability. By precisely tuning the Rb-Cs ratio, it realizes ASE across the blue-green spectrum (481–532 nm). Rb-Cs alloying critically modulates the quantum well distribution, optimizes the energy landscape, and suppresses Auger recombination, resulting in a record-low ASE threshold of 1.94 µJ·cm −2 —over 50% lower than that of mixed-halide perovskites. These materials exhibit remarkable spectral robustness, with ASE spectra remaining stable even after prolonged thermal annealing, thereby overcoming halide migration-induced degradation. Furthermore, micro-ring laser arrays fabricated from these Rb-Cs alloyed perovskites demonstrate superior lasing characteristics, including high-quality whispering-gallery-mode resonances and low lasing thresholds, underscoring their potential for advanced laser technologies.
研究领域:
光电子学
·
材料科学
·
光子学
·
半导体激光器
·
钙钛矿光电器件
·
激光技术
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hui Yang,Baozhong Ma,Shuyang Shi,Jiancheng Yu,Yubo Liu,Zhihe Cao,Chengyan Wang
The alkali method has been proven to be an effective approach for lithium (Li) and rubidium (Rb) extraction; however, the significant dissolution of silicon (Si) remains a challenging issue. A high Si concentration in the leachate can cause filtration difficulties and pipeline blockages, while also negatively affecting phase separation during the subsequent extraction of Rb. Additionally, since the leachate needs to be recycled, the removal of Si from the leach liquor is essential. This study introduces an innovative approach of adding Al(OH) 3 for Si removal during the alkali leaching of lithium concentrate. Preliminary single-factor experiments demonstrate that Al(OH) 3 effectively reduces the Si concentration in leach liquor but also consumes NaOH, leading to a decline in Li and Rb leaching efficiency. Given the interaction between Al(OH) 3 addition and NaOH concentration on element leaching, Response Surface Methodology was employed to predict and optimize the parameters of the leaching process. Under the optimal parameters of 290 g/L NaOH concentration, 39 % Al(OH) 3 addition, and 120 °C leaching temperature, the experimental leaching efficiencies of Li, Rb, and Si were 99.8 %, 87.9 %, and 4.1 %, respectively. Subsequently, Rb was separated with Li via solvent extraction under high alkaline conditions. The single-stage extraction efficiency of Rb was 82.8 % at optimized conditions, and after four-stage countercurrent extraction, the overall Rb recovery could reach 99.2 %. The innovative alkali method proposed not only enables the synergistic extraction and separation of Li and Rb but also achieves effective Si removal and its utilization.
研究领域:
化学工程
·
材料科学
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高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Lu Qi,Zhaohui Chen,Xuerui Shi,Xiaodong Zhang,Qun Jing,Na Li,Zhongqi Jiang,Bingbing Zhang,Ming-Hsien Lee
Exploring novel photoelectric functional materials via chemical substitution-oriented design is an effective strategy, which can be expanded to the discovery of high-performance UV nonlinear optical (NLO) materials. Two new NLO pyrophosphates, Rb3BaBi(P2O7)2 (I) and Cs3BaBi(P2O7)2 (II), are rationally developed by a cation substitution technique based on A3PbBi(P2O7)2 (A = Rb and Cs), of which I inherits the large second-harmonic generation (SHG) response (exptl 2.5 × KDP; calcd 2.9 × KDP) and moderate birefringence (0.025@1064 nm) accompanied by a broadened UV transparent region. Compounds I and II are isomeric and exhibit different Ba–P–O frameworks. Especially, I possesses a large SHG effect benefiting from the favorable pentagonal-net topological structure. Detailed theory calculations elucidate the origin of the linear and nonlinear optical properties of the compounds. The insights obtained from the atomic-level module adjustment involving lone-pair-active optical anisotropy are useful for designing more efficient UV NLO materials.
研究领域:
材料科学
·
非线性光学
·
无机化学
·
晶体工程
·
计算材料科学
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Yanping Wang,Kexin Li,Dezhen Fang,Xiushen Ye,Haining Liu,Xiaoli Tan,Quan Li,Jun Li,Zhijian Wu
A new composite adsorbent (AMP@MOF-76(Sm)) grafted ammonium molybdophosphate onto MOF-76(Sm) was synthesized via a solvothermal method and well-characterized by SEM-EDS, particle size analysis , N 2 adsorption-desorption isotherms, TG, FT-IR, XRD and XPS analysis . The adsorption behaviors of Rb + and Cs + on synthesized AMP@MOF-76(Sm) were investigated depending on the parameters of solution pH, ionic strength, contact time, ion concentration and temperature. The adsorbent can adsorb Rb + and Cs + from the solution when the solution pH ranged from 4.0 to 10.0 and the coexisted ion (Na + ) has little effect on the adsorption amounts of both Rb + and Cs + . The adsorption kinetic data fitted well with pseudo-second order kinetic models . The adsorption equilibrium of Rb + and Cs + on AMP@MOF-76(Sm) is better explained by the Langmuir isotherm model and the maximum adsorption amounts for Rb + and Cs + are 0.490 mmol g −1 and 0.434 mmol g −1 , respectively. Furthermore, the AMP@MOF-76(Sm) could be easily reused at least four times using 3.0 mmol L −1 ammonia nitrate as the eluent . The mechanism of the adsorption of Rb + and Cs + is proposed to be a combination of electrostatic attraction and ion exchange mechanism.
研究领域:
环境科学
·
材料科学
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 17
·6638-6645
·
IF 4.569
Lin-Tao Jiang,Ming-Ze Li,Xiao-Ming Jiang,Bin-Wen Liu,Guo-Cong Guo
Mixed-anionic compounds have caught considerable attention due to their flexible coordination manners and abundant physical properties. Four new chalcohalides RbIn4S6Cl (1), CsIn4S6Cl (2), Pb5Sn3S10Cl2 (3) and Pb5Sn3Se10Cl2 (4) were successfully obtained by the high-temperature halide salt flux method. Compounds 1 and 2 have layered structures that consist of octahedral InS6 and aliovalent-anionic InS3Cl units. Compounds 3 and 4 feature 3-D structural frameworks built by [Pb4SnQ8Cl4]6− and [PbSn2Q6]2− (Q = S and Se) polyhedral chains, in which partial Pb2+ cations are coordinated by Q2− and Cl− anions. Compounds 1–4 have optical band gaps close to the wavelength range of visible light and exhibit significant photocurrent responses of 28.75 nA cm−2, 55.12 nA cm−2, 19.58 mA cm−2, and 36.12 μA cm−2 with on/off ratios 30.0, 2.5, 15.7 and 2.6, respectively, implying their potential for photovoltaic applications. To the best of our knowledge, compound 3 has the largest photocurrent response among all non-oxides. In addition, the activation energies of 1–4 are well below 0.3 eV, which makes these compounds interesting for potential applications in electrochemical devices. This work sheds light on the exploration of promising photocurrent response materials in the mixed-anionic compound system.
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2026
·
IF 16.8
Zengqi Ye,Xin Zhou,Qianshu Xia,Xuanbing Chen,Xiaofeng Lu,Qian Teng,Tianxiang Ren,Xian Tong,Zhaoping Chen,Yuncang Li,Li Zhu,Cuie Wen,Jixing Lin,Jianfeng Ma
Two-step K/Rb ion exchange (IE) enables high exchange depth and high stress levels. • Residual stress originates from volumetric expansion of the amorphous phase. • Mechanical properties of lithium disilicate (LD) are effectively enhanced via IE. • IE induces a transition from brittle to ductile damage mode in 3D-printed LD. • 3D-printed LD veneers after IE show an increased crack-initiation threshold. To improve the mechanical reliability of thin-walled lithium disilicate (LD) veneers, this study developed a strengthening strategy that integrates vat photopolymerization (VP) with a two-step ion-exchange (IE) process. VP was employed to fabricate thin-walled LD structures, eliminating machining-induced damage, while a sequential K⁺/Rb⁺ IE process achieved both sufficient IE depth and compressive stress, overcoming their conventional trade-off. The two-step IE process increased the flexural strength of LD by 52.0% to 448.6 ± 31.5 MPa and improved the fracture toughness by 80.4% to 2.64 ± 0.10 MPa m 1/2 . The significant enhancement in mechanical performance was mainly attributed to a 349% increase in compressive stress (CS), reaching 141.9 ± 4.4 MPa. The atomic force microscope revealed that the ultrahigh CS was attributed to the volumetric expansion of an amorphous phase. Under scratching loads of 100 mN above the brittle-ductile transition threshold (∼70 mN), the coefficient of friction of IE-processed LD increased by nearly 50%, indicating a transition in energy dissipation from brittle crack initiation to localized plastic deformation. Overall, the VP-fabricated LD, after undergoing the two-step IE processing, exhibits markedly enhanced strength and toughness. This improved mechanical performance effectively resists crack initiation and propagation caused by sharp contacts, thereby contributing to the superior long-term reliability of the LD veneers in the oral masticatory environment. Download: Download high-res image (510KB) Download: Download full-size image
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 20
·7839-7845
·
IF 3.069
Kun Chai,Shichao Cheng,Hongyi Li,Bin Dai
A new phosphate fluoride, Rb2CaPO4F, was synthesized from a high temperature solution. Single-crystal X-ray diffraction analysis indicates that Rb2CaPO4F belongs to the Pnma space group of the orthorhombic system. It exhibits an intricate three dimensional (3D) framework that consists of 1D infinite zig-zag [FRb2Ca]∞ chains interlinked by isolated PO4 tetrahedra. The 1D chains are composed of plane-sharing F-centered [FRb4Ca2] octahedra. Meanwhile, we also obtained another phosphate fluoride K2CaPO4F, which is isostructural with Rb2CaPO4F. Moreover, the effect of the cation size on the framework structures of A2CaPO4F (A = K, Rb) and K2BaPO4F is discussed in detail. In addition, the UV-Vis-NIR diffuse reflectance spectra and the infrared spectra were measured to determine their cut-off edge and the anionic group, respectively. The first-principles theoretical studies were also conducted to aid in the understanding of the electronic structures and linear optical properties.
研究领域:
材料科学
·
化学
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Taotao Lu,Yongfeng Zhu,Yuru Kang,Jiang Xu,Aiqin Wang
The radioactive Rb + , Cs + and Sr 2+ have serious threat for the aquatic life and human health, its removal has been granted increasing concern. Hence the adsorbent with excellent adsorption performance and favourable reusability is strongly demanded. This work prepared a novel porous polymer of chitosan- g -polyacrylamide (CTS- g -PAM) by grafting the acrylamide (AM) onto the chitosan (CTS) with sufficient pore structure via an eco-friendly surfactant-free (corn oil)-in-water Pickering medium internal phase emulsion (O/W Pickering MIPE), solely stabilized by CTS. Interestingly, its pore structure could be tuned by varying the emulsion character via changing the molecular weight and concentration of CTS, as well as the pH values. Due to the abundant –COO − and −NH 2 functional groups in the porous material of CTS- g -PAM, the high adsorption capacities of 195.43, 237.44 and 185.63 mg/g for Rb + , Cs + and Sr 2+ could be reached within 40, 30 and 20 min, respectively. Moreover, the CTS- g -PAM had excellent regeneration ability and reusability. Herein, we provided a feasible and low-cost pathway for preparation of the porous adsorbent with tunable porous structure for adsorption and separation application.
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高影响因子
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