MACROMOLECULES
·
2024
·
IF 5.1
Kai Geng,Tengyao Xue,Xiaodan Li,Haoqi Sang,Shichao Feng,Chenyi Wang,Hanli Wang,Yongbing Zhuang
In this study, a novel diamine monomer (BTPA) containing a benzocyclobutene (BCB) cross-linking site was synthesized, and two polyimides (PIs), PI-BCB-1 and PI-BCB-2, were synthesized using BTPA with dianhydrides, 4,4′-(hexafluoroisopropyl) diphenyl anhydride (6FDA) and 4,4′-(4,4-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA), respectively. The BCB-based PIs were soluble in common organic solvents and exhibited a desirable toughness. The cross-linking behavior of the BCB-based PIs was investigated using nonisothermal differential scanning calorimetry, and a mathematical model for the curing kinetics was established. Further, the effects of BCB cross-linking on the interchain packing, thermal performance, and gas transport properties of the PIs were thoroughly examined. The cross-linked PIs exhibited excellent heat resistance with glass-transition temperatures exceeding 400 °C. In addition, the CO2 and CH4 permeabilities for the cross-linked PI membranes increased 16- and 27-fold, respectively, compared with their counterparts before cross-linking. Remarkably, the CO2 permeability for PI-BCB-1 increased from 33 to 1559 Barrer after cross-linking, while maintaining a nearly unchanged CO2/CH4 selectivity of 35 (39 for its uncross-linked counterpart), surpassing the 2008 Robeson upper limit. In addition, the cross-linked PI membranes showed desirable aging resistance and excellent plasticization resistance. This study offers insights for designing PIs containing BCB side group-cross-linked units to enhance membrane-based gas separation performance.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 8
·e71060
·
IF 4.2
Haoyan Zhang,Canrong Luo,Huairen Cui,Zaijin Fang,Hong Jia
Developments for high light yield and high density of Ce 3+ -doped glass scintillators are of fundamental importance for practical applications in fields of nuclear medical imaging and high-energy physics. Here, a series of Ce 3+ -doped glass scintillators was designed. The glasses exhibit broadband emissions around 380 nm, and the photoluminescence quantum yield (PL QY) reaches 78.63%. By adjusting the Gd 2 O 3 /GdF 3 ratios of the glasses, the properties such as density, light yield, and transmittance of glass scintillators are all modulated. The optimized glass GSG 3 (Gd 2 O 3 :GdF 3 = 1:1) exhibits superior performance, including a high density of 5.562 g/cm 3 , high transmittance of 93% at 400 nm, a high light yield of 2859 ph/MeV, and an energy resolution of 19.3%@662 keV. The X-ray imaging system utilizing a self-developed glass scintillator was employed to acquire clear images of objects such as metal springs and integrated circuit chips, and achieved a spatial resolution of 14 lp/mm. The designed glass provides a low-cost scintillator for potential applications in medical imaging and radiation detection. This study also offers a powerful solution to conquer the conventional contradictions of glass scintillators between density and light yield.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 5.2
Di Ma,Jingtao An,Xiaoming Huang,Minghao Zhai,Chunli Ma,Na Wei,Wanan Cai,Tingting Zhou,Haijun Niu
A diamine containing carbazole (Cz) and triphenylamine (TPA) groups, N-(4-(dibenzocarbazol-7-yl) phenyl)-N-(4-aminophenyl) benzene-1,4-diamine (DC7TPA-NH2), is designed and used to form three polyamides (PAs): DC7TPA-SA, DC7TPA-CA, and DC7TPA-OA through linear condensation with three dicarboxylic acids. The photophysical properties including UV–visible absorption spectra and photoluminescence (PL) emission spectra of three PAs are measured. Among them, DC7TPA-CA exhibits an intense PL emission. Upon comparison of UV–visible absorption spectra and PL emission spectra of DC7TPA-CA in diverse solvents, a consistent red shift in the PL emission peak is observed with increasing solvent polarity. Most notably, electrochromic (EC) performance testing revealed that this series of PA films exhibit optical contrast exceeding 90% and have good cycling stability. Specifically, the DC7TPA-SA film shows the highest optical contrast, reaching an impressive 95%. Meanwhile, due to the presence of ether oxygen bonds stabilizing free radicals, DC7TPA-OA demonstrates the best cycling stability among the three PAs. To further investigate its potential for application in EC smart windows (ECSWs), DC7TPA-OA is fabricated into an EC device (ECD). Testing reveals a maximum (initial) optical transmittance change (ΔT) of 88% with only a 3% decay after 240 cycles. Compared to other ECSWs, device of DC7TPA-OA consistently ranks among the top in terms of ΔT performance across all-most categories, whether inorganic ECDs, organic ECDs, COF-based ECDs or composite ECDs, and also demonstrates excellent response times and coloring efficiency (CE). Furthermore, the three PAs exhibit distinct color-changing behaviors, and DC7TPA-CA and DC7TPA-OA maintain a colorless neutral state. This property meets diverse application requirements, especially for ECSWs. Additionally, DC7TPA-CA possesses a high PL quantum efficiency (φ) and sensitivity to trinitrophenol (TNP), making it a promising candidate for nitroexplosive detection.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Weikang Zhang,Xuefan Deng,Yanjun Chen,Xuhui Tan,Qihan Hu,Chunbo Xie,Kefeng Xie,Haibo Zhang
The photocatalytic conversion of nitrate (NO 3 − ) to ammonia (NH 3 ) represents a dual-benefit strategy for environmental remediation coupled with the recovery of a valuable chemical feedstock. In this work, we demonstrate that boron-doped black titanium dioxide materials (B x -TiO 2 ), synthesized using closo -dodecaborate dianion ([ closo -B 12 H 12 ] 2− ) as the boron (B) source, serve as efficient catalysts for photoreduction of NO 3 − to NH 3 in aqueous media under visible-light irradiation. B doping induces the formation of an amorphous phase in TiO 2 , which optimizes surface properties, narrows the band gap, and extends the optical absorption spectrum from the ultraviolet to the visible region—resulting in a significant enhancement in light utilization efficiency. Density functional theory (DFT) calculations reveal orbital hybridization between Ti and B, confirming their synergistic catalytic role. Among the series of synthesized materials, B 1 -TiO 2 exhibits the highest catalytic activity, achieving an ammonia production rate of 769.0 μmol g cat −1 h −1 , which compares favorably with previously reported systems. This work on heterogeneous B doping is expected to serve as a reference for the development of efficient catalysts in follow-up studies.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Jianan Wang,Fu Du,Jiangyan Xu,Jiaqing Peng,Yipeng Liu,Yali Sun,Daowang Liu,Decai Huang,Xinyu Ye
Mini/Micro-LED backlight systems require color conversion layers that combine submicron size with high absorption efficiency. However, commercial phosphors are difficult to meet this demand due to their relatively large particle size. The Cs 2 MnF 6 system demonstrates a unique advantage due to its intrinsic high absorption efficiency. In this study, submicron-sized Cs 2 MnF 6 was successfully prepared via anti-solvent synthesis method. Furthermore, a Si 4+ reverse doping strategy was employed (Cs 2 MnF 6 :Si 4+ ) to effectively suppress concentration quenching. At the optimal doping concentration, the emission intensity reaches 3523 times that of the undoped Cs 2 MnF 6 host. Subsequently, surface passivation treatment was applied with a Mn 4+ -free Cs 2 SiF 6 coating. This treatment not only suppressed surface quenching, further increasing the luminescence intensity, but also significantly improved the material's moisture resistance. The finally obtained Cs 2 MnF 6 :Si 4+ @Cs 2 SiF 6 phosphor has an average particle size of approximately 800-900 nm and a high absorption efficiency of 48.4%. Its luminescence intensity is 4.25 times that of the un-passivated sample. And this material retained 75% of its initial luminescence intensity after 240 minutes of immersion in deionized water. In contrast, the untreated sample remained only 16.4%. These advancements highlight the significant potential of this material in mini/micro-LED backlight systems, offering new possibilities for the development of next-generation display technologies.
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Shasha Wang,Xinxin Han,Dongxi Liu,Linghang Kong,Tao Hu,Qilin Wei,Hui Peng,Ruosheng Zeng,Bingsuo Zou
Conventional storage scintillators are plagued by rapid information fading during X-ray real-time imaging at room temperature, a consequence of intense X-ray excited persistent luminescence (XEPL) from high-density shallow traps. To address this limitation, we demonstrate a synergistic band/trap engineering strategy in RbCdF 3 :Mn 2+ via Cs + /Eu 3+ co-doping. Specifically, Cs + doping narrows the bandgap, increasing the carrier density for radiative recombination and boosting the radioluminescence (RL) intensity to 1000%. In parallel, Eu 3+ doping introduces charge-compensated defect clusters ( 2 E u C d · − V C d ′ ′ $2Eu_{Cd}^ \cdot - V_{Cd}^{^{\prime\prime}}$ ) that elevate the deep trap density to 933%. This synergistic optimization yields a high-performance scintillator exhibiting an RL intensity of 625% relative to BGO, an ultra-low detection limit of 102.3 nGy s −1 , and an ultra-weak room-temperature XEPL that is visually undetectable and weaker than commercial LuAG:Ce. Notably, the regulatory effect of this co-doping strategy is demonstrated to be universal across the ABF 3 :Mn 2+ series. Furthermore, a flexible scintillator film fabricated from this material achieves an ultra-high spatial resolution of 22.7 lp mm −1 , substantially surpassing most reported counterparts. It enables both ghost-free X-ray real-time imaging and stable multi-cycle X-ray time-delay imaging (XTDI) via thermal stimulation. This work establishes a versatile material design platform for high-performance, low-dose X-ray imaging in both real-time and delayed modes.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19
Hongkang Su,Chenxu Li,Jiahao Jiao,Zhihua Yang,Shilie Pan,Min Zhang
The development of modern science urgently needs the vital tool of deep-ultraviolet (DUV, λ < 200nm) all-solid-state lasers, while the exploration of DUV nonlinear optical (NLO) crystals is limited by their strict application conditions. Herein, we propose a structural design strategy for developing novel DUV NLO optical crystals through synergistic assembly of fluorinated polyhedral and planar B─O groups with balanced optical properties, namely, large second-harmonic generation (SHG) response, appropriate birefringence, and wide band gap. The key to achieve consistent alignment of π-conjugated functional groups lies in leveraging the “shearing” effect and directional polymerization capability of fluorinated polyhedra. Furthermore, based on this strategy, a series of alkali-metal fluorooxoborates M x (NH 4 ) 2- x B 8 O 12 F 2 (M = K, Rb; 0 < x < 2; KABF, RABF) and CsNH 4 B 8 O 12 F 2 (CABF) were successfully designed and synthesized. Driven by uniformly arranged [BO 3 F] 4− and chain-like aggregated [BO 3 ] 3− functional groups, these compounds achieve a well-balanced optimization of strong SHG response (1.6–1.7 × KDP, 1064–532 nm; 0.4–0.5 × BBO, 532–266 nm, respectively) and the shortest type-I phase-matching wavelength (161.5–168.6 nm). The inspiring results highlight their potential as candidates for DUV NLO crystals and provide support for the structure construction strategy using a synergistic combination of fluorinated polyhedra and polymerized BO 3 units.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Xing Liu,Jianjun Zhou,Jianqing Zhao,Shumei Liu
To simultaneously improve the storage stability of epoxy/imidazole systems and flame retardancy without sacrificing the thermal, mechanical and dielectric properties of thermosets , a novel multifunctional polyetherimide containing benzimidazole and phosphorus (mPI) was synthesized and used as a hardener for diglycidyl ether of bisphenol A (DGEBA). In addition to retaining the effective curing behavior of imidazole , mPI, a macromolecular hardener and flame retardant , could endow the mixture of DGEBA and mPI (EP/mPI) with the long latent period and thermosets with the high performance. The results showed that mPI was unreactive at ambient temperature and underwent the rapid curing reaction at 170 °C that is a little higher than its glass transition temperature ( T g ) of 164.7 °C, and EP/mPI showed the long thermal latent period of 70 days or more. Meanwhile, the cured EP/mPI attained the UL-94 V-0 rating with the LOI value of 31.2%. Besides, EP/mPI thermoset showed a 42.9 °C, 47.6 °C, 18.2 °C, 135.4% and 60.6% increase in the T g , heat deflection temperature, temperature at 5% mass loss, storage modulus and Young's modulus , respectively, as well as a 3.6% decrease in the dielectric constant at 100 MHz, in comparison with those of the traditional cured DGEBA/benzimidazole (EP/BIM). This work provides a facile strategy to prepare one-pot epoxy/imidazole formulations and flame-retarded epoxy thermosets with high performance by using the well-designed multifunctional polyetherimides as a hardener and flame retardant, which has good application prospects in electronics.
✓ 已验证
产品关联
DOI
高影响因子
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
·
2023
·
IF 4.7
Xingan Cheng,Fangyun Dong,Junjie Li,Qiwen Zou,Xin Liu,Huiqing He,Hanhui Zhang,Xiaojing Lv,Yuehua Wu,Xuhong Jiang,Xiangjing Qin
As one of the major threats to global food security, Spodoptera frugiperda ( S. frugiperda ) is highly gaining consideration due to its severe damage. Matrine is a widely and effectively used botanical insecticide in controlling S.frugiperda but lacks a rapidly available effect. To further improved the insecticidal activity of matrine based on combination principles, this work synthesized five new pyrazole matrine derivatives (PMDs) using Michael addition and investigated insecticidal activity against 2nd instar larvae of S. frugiperda ( in vivo ) and its isolated cell( in vitro ). Our result demonstrated that PMDs show higher pesticidal activity than that matrine in both in vitro and in vivo assays. The most toxic derivatives in vitro and in vivo are PMD-3 and PMD-1, with IC 50 of 2.49 mM and LC 50 of 22.76 mg/L respectively. This research also investigates the anti-proliferation mechanism of PMDs based on isolated cells. PMDs decrease mitochondria membrane potential , arrested cell cycle at the G2/M phase, and upregulated Caspase 3 , Caspase 9 , and Apaf-1 to induce Caspase-dependent apoptosis. For Caspase-independent apoptosis, AIF and Endo G were found to be upregulated. Besides, pro-apoptotic factors like p53, IBM-1, and anti-apoptotic factors like IAP were upregulated. Moreover, we supposed that there was a linkage between lysosomes and PMD-induced apoptosis according to increased apoptosis rate , activated lysosomes, and upregulated Cathepsin B . This research provides new ideas for the synthesis of matrine derivatives and further demonstrated the anti-proliferation mechanism of PMDs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Konglan Chen,Shiyu Jia,Xueliang Zhang,Zifan Shao,Yayun Zhou,Ting Fan,Ting Yu,Tingting Deng
Development of highly thermally stable broadband near-infrared (NIR) luminescence materials is crucial for advancing the prolonged stable application of smart NIR light sources. In this study, a zero-thermal-quenching and reversible temperature-dependent broadband NIR-emitting Cs2NaAl3F12:Cr3+ phosphor is demonstrated, benefiting from its stable polyhedron-cluster-building rigid structure. The excellent thermal stability of Cs2NaAl3F12:Cr3+ is rooted in its stable [Al6Na4F45] cluster building unit, which provides a rigid structure with a weak electron–phonon coupling effect and a wide band gap with a huge thermal activated barrier. Such characteristics are well revealed by multiple studies on crystal structure, electronic structure, Huang–Rhys factor S, configuration coordinate model, and Debye temperature. The incorporation of Li or K instead of Na weakens the luminescence thermal stability, directly proving the importance of the stable [Al6Na4F45] cluster for stable Cr3+ substitution and rigid structure construction. Furthermore, Cs2NaAl3F12:Cr3+ presents much superior thermal stability compared to traditional rigid garnet-type fluorides Na3X2Li3F12:Cr3+ (X = Al, Ga, In). A high-power NIR LED is presented, utilizing the high quantum efficiency (∼71%) and extremely thermally stable broadband NIR emission around 750 nm of Cs2NaAl3F12:Cr3+. It realizes clear vein and cartilage imaging in the human hand, demonstrating its potential in medical diagnosis applications. This result provides important insights for designing new-type rigid crystal structures using stable polyhedron clusters as basic units, advancing the development of highly thermally stable NIR-emitting phosphors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 17
·5587-5596
·
IF 4
Zhijian Liao,Yan Li,Jiaxing Zuo,Guang Chen,Heng Liang,Shihao Wu,Jiaqing Peng,Xinyu Ye
For high-efficiency lighting and wide color gamut backlight display, high-quality narrow-band red phosphors for WLEDs are still in high demand. Herein, a novel red-emitting fluoride phosphor Cs2NaGaF6:Mn4+ was successfully synthesized by a simple two-step co-precipitation method and exhibits ultra-intense zero-phonon lines (ZPLs) and long wavelength phonon sidebands under 468 nm blue light irradiation. The ZPL emission peak of Cs2NaGaF6:Mn4+ was located at 627 nm, which is much stronger than its υ6 vibration peak, more matchable with the eye-sensitive region of humans, and beneficial for obtaining higher luminous efficiency of WLEDs. Interestingly, the υ6 vibration peak of this red phosphor is at 636.5 nm, which is larger than that of the common fluoride phosphor A2BF6:Mn4+ (usually at about 630 nm, represented by K2SiF6:Mn4+) at about 6.5 nm. Thanks to the longer wavelength of the υ6 vibration peak, the chromaticity coordinates (0.7026, 0.2910) with a larger x-coordinate value were realized, leading to a potentially wider color gamut of WLEDs. In addition, this phosphor has high thermal stability and its emission intensity at 423 K remains 93.7% of the initial intensity at room temperature. The lumen efficiency of WLED1 packaged with a mixture of Cs2NaGaF6:Mn4+ and YAG:Ce3+ on the InGaN blue chip is 115.7 lm W−1 with the color temperature (Tc) = 3390 K and the colour rendering index (Ra) = 92.5 under 20 mA driving current. The chromaticity coordinates of WLED2 packaged with Cs2NaGaF6:Mn4+ and β-SiAlON:Eu2+ on the InGaN blue chip are (0.3149, 0.3262) and the calculated color gamut is up to 118.4% (NTSC). These results indicate that Cs2NaGaF6:Mn4+ red phosphors have promising applications in the high-quality lighting and display fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junze Tong,Long Li,Haiqing Su,Feng Hong,Edwin Yue Bun Pun,Hai Lin
Red-emitting Mn 4+ -doped fluoride phosphors are promising fluorescent material for use in high-performance warm white light emitting diodes (WLEDs). However, low stability and non-green synthesis method limit the development and commercialization of such phosphor. Herein, a series of novel (Li/Na/Cs) 0.4 Ba 0.8 SiF 6 :Mn 4+ phosphors with optimized fluorescence properties induced by alkaline metal ions replacement are successfully synthesized via a green and eco-friendly approach. Under the irradiation of 460 nm blue light, Cs 0.4 Ba 0.8 SiF 6 :Mn 4+ red phosphor with narrow band emission peak has the best optical performance. The optimal doping concentration of Mn 4+ in Cs 0.4 Ba 0.8 SiF 6 host and the reason for concentration quenching are systematically analyzed. Furthermore, the moisture resistance and thermal stability of this phosphor are discussed. After being soaked in deionized water for 90 min, the PL intensity of Cs 0.4 Ba 0.8 SiF 6 :Mn 4+ phosphor can maintain at 40% of that in air, which is 4 times higher than commercial K 2 SiF 6 :Mn 4+ . At the operating temperature of LED (423 K), Cs 0.4 Ba 0.8 SiF 6 :Mn 4+ red phosphor can exhibit stable light output intensity and color. A warm WLED with low correlated color temperature of 4336 K, high color rendering index of 88.4 and high lumen efficiency of 105.96 lm/W is fabricated via using Cs 0.4 Ba 0.8 SiF 6 :Mn 4+ phosphor as a component of red-light, and the warm WLED can maintain stable output even at high driving currents. Overall, the alkali metal ion replacement and green synthesis strategies have opened up a new perspective for the synthesis of efficient Mn 4+ -doped fluoride phosphors, which has dual benefits for optimizing the performance of WLED and environmental protection.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）