Polymers
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2022
·Vol. 14
·期 14
·2880
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IF 4.967
Ming Fang,Wenjuan Wei,Ruoxin Li,Liucheng Mao,Yuanheng Wang,Yan Guan,Qiang Chen,Zhigang Shuai,Yen Wei
The study of aggregation-induced emission luminogens (AIEgens) shows promising perspectives explored in lighting, optical sensors, and biological therapies. Due to their unique feature of intense emissions in aggregated solid states, it smoothly circumvents the weaknesses in fluorescent dyes, which include aggregation-caused quenching of emission and poor photobleaching character. However, our present knowledge of the AIE phenomena still cannot comprehensively explain the mechanism behind the substantially enhanced emission in their aggregated solid states. Herein, to systematically study the mechanism, the typical AIEgens tetraphenylethene (TPE) was chosen, to elucidate its photophysical properties, the TPE in THF/H2O binary solvents, TPE in THF solvents depending on concentration, and the following direct conversion from a dissolved state to a precipitated solid state were analyzed. Moreover, the TPE derivatives were also investigated to supply more evidence to better decipher the generally optical behaviors of TPE and its derivatives. For instance, the TPE derivative was homogeneously dispersed into tetraethyl orthosilicate to monitor the variance of photophysical properties during sol–gel processing. Consequently, TPE and its derivatives are hypothesized to abide by the anti-Kasha rule in dissolved states. In addition, the factors primarily influencing the nonlinear emission shifting of TPE and its derivatives are also discussed.Keywords:aggregation-induced emission;sol–gel synthesis;tetraphenylethene;emission mechanism
研究领域:
化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Xiansong Li,Shiquan Liu
Silica xerogels were synthesized via the hydrolysis and condensation of tetraethyl orthosilicate (TEOS) under the catalysis of n-butylamine (BA), followed by drying the formed wet gel under ambient pressure at 120 °C. The solvents (water and ethanol) and catalyst enclosed in wet gels were recovered during the drying process. It was found that the relative percentage of ethanol in the recovered liquids increased, while those of water and butylamine decreased. The recovered liquids were directly used for four runs, and then the contents of BA, H2O, and TEOS were adjusted to maintain the reactant ratios to be the same as those in the first run, facilitating a fast sol and gel formation. Totally 12 silica xerogels with high degree of three-dimensional Si–O–Si network were synthesized. The results indicate that all the silica xerogels are composed of aggregated particles sized 20–250 nm, resulting in porous networks with specific area, pore volume, and pore diameter in the range of 290–690 m2/g, 1.54–2.40 cm3/g, and 17.4–68.2 nm, respectively. The compositional change in the recovered liquids, the drying time, and the volume of wet gel had influence on the aggregation, degree of condensation, and surface area of the cyclically synthesized xerogels. The synthesis route not only saves resources but also does not generate any waste, providing a sustainable sol−gel way to synthesize materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2019
·
IF 5.439
Yi Zhang,Wen Tao,Kehan Wang,Dongxu Li
Microencapsulated phase change materials (MePCMs) were prepared in this study through sol-gel synthesis; these materials consisted of SiO 2 as shell and paraffin as core materials, and were subsequently incorporated in gypsum. Further, this study examined the thermal regulation performance of gypsum materials. Fourier transform infrared spectra confirmed the encapsulation of the paraffin with SiO 2 shell. Scanning electron microscope (SEM) results showed that the microcapsules obtained at a pH of 2.5 exhibit a regular spherical structure, excellent dispersibility , and compact surface structure. The MePCMs were found to reveal high thermal performance and encapsulation efficiency even in this synthetic condition. This is because the SiO 2 shell with its high compactness imparts high thermal stability and a good anti-osmosis performance to the microcapsules. Further, gypsum materials achieved high mechanical strength, compactness, thermal conductivity , and a good thermal regulation performance with the weight ratio of MePCMs at 10 wt%. The results showed that the MePCMs in the gypsum matrix exhibited advantageous application prospects for the thermal regulation in buildings.
研究领域:
建筑材料学
·
热能工程
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Yaling Wu,Xiaotong Sun,Junchen Zhu,Jiawei Shen,Huiying Wang,Lunan Zhu,Yang Zhou,Yanxiong Ke
In recent years, core–shell silica particles (CSSPs) have been increasingly used for highly efficient separation at fast flow rates and relatively low back pressures in high-performance liquid chromatography (HPLC). However, material synthesis techniques for producing CSSPs economically in batch processes remain elusive. In this report, a practical and straightforward method for the preparation of CSSPs is presented. By refluxing freshly prepared nonporous silica particles in ammonia–water solution in the presence of poly(diallyldimethylammonium chloride) at 70–100 °C, CSSPs with shell thicknesses of up to 300 nm and pore sizes from 8 to 25 nm were easily prepared. The effects of the synthetic conditions on the shell thickness, surface area, and pore size were investigated in detail, and the method reproducibility was evaluated in scale-up experiments. A mechanism of CSSP formation is also proposed. The CSSPs were characterized via scanning electron microscopy, transmission electron microscopy, laser particle size (dynamic light scattering) analysis, and nitrogen adsorption and desorption experiments. The synthesized 3.4-μm CSSPs were functionalized with dimethyloctadecylchlorosilane and used as an HPLC packing material, exhibiting excellent separation performance for both small molecules and large biomolecules. In summary, we report the simplest method developed thus far for the preparation of monodisperse core–shell silica particles suitable for HPLC column packing.
研究领域:
化学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2019
·
IF 1.911
Weiquan Cai,Junlin Zhuo,Jimin Fang,Zhichao Yang
A series of nanorod-like porous Pd/γ-Al 2 O 3 catalysts with controllable textural properties and enhanced catalytic performance in 2-ethyl-9,10-anthraquinone (eAQ) hydrogenation for H 2 O 2 preparation were successfully prepared via a facile sol–gel method using aluminum isopropoxide as aluminum precursor and eAQ as structure directing agent, sequential calcination and impregnation process with Na 2 PdCl 4 solution. The physicochemical properties of the catalysts obtained with different addition amounts of eAQ were comparatively characterized by XRD, TG–DSC, BET, TEM, CO-TPR, H 2 -TPR and H 2 –O 2 titration. The results show that addition of eAQ can not only effectively control the textural properties (surface area, pore volume and average pore size) of the catalysts, but also lower their reduction temperature of active metal. Importantly, the catalyst obtained with an addition amount of 4 wt% eAQ shows the highest hydrogenation efficiency of 10.28 g·L −1 , which is 37.3% higher than 7.49 g·L −1 of the catalyst obtained without eAQ.
研究领域:
催化
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zheqin Chen,Yongmin Xie,Zhibin Lu,Xiaocong Zhong,Zhifeng Xu
This research addresses the issue of particle agglomeration and a low catalytic activity in the traditional sol–gel preparation of LaNi 0.5 Co 0.5 O 3 (LNCO). A new synthetic strategy is proposed, leveraging the combination of polyvinylpyrrolidone (PVP) serving as a complexing agent and graphene nanosheet (GN) functioning as a template, successfully producing a high-activity LNCO cathode material (GN-LNCO) with a layered structure. Various characterizations confirmed that incorporating PVP and GN effectively suppressed particle agglomeration at high temperatures. The optimized GN-LNCO exhibited excellent physicochemical properties, including a specific surface area of 45.21 m 2 g −1 , a more regular mesoporous structure, a higher electronic conductivity, and a greater oxygen vacancy concentration. Electrochemical performance tests showed that the GN-LNCO cathode demonstrated an outstanding performance in solid oxide fuel cells at 800 °C, with a peak power density of 350.91 mW cm −2 . This represented an improvement of 28.65% over the conventional LNCO. Additionally, a 72 h long-term stability test of a GN-LNCO single cell revealed a voltage decay rate of only 1.60%, indicating its excellent stability. Overall, this study provides a novel material design strategy for developing high-performance cathodes, which has significant implications for advancing solid oxide fuel cell technologies.
研究领域:
材料科学
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电化学
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能源技术
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纳米技术
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无机化学
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产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
·
IF 6.3
Qingyang Mei,Hui Liu,Jinjia Wei
To address the challenges of structural degradation and low solar absorptivity in calcium-based thermochemical energy storage systems under high-temperature cycling, we propose a novel Mn/Al/Ce ternary-doped CaO composite (Ca10Mn1Al1Ce1) optimized for solar-driven calcium looping applications. Through a sol-gel synthesis strategy, the co-doping strategy synergistically integrates structural stabilization mediated by Ca 2 MnO 4 /Ca 3 Al 2 O 6 frameworks, carbonation kinetics enhancement through CeO 2 -induced oxygen vacancies, and Mn element doping, significantly improving the material's solar energy absorption performance. The optimized material demonstrates unprecedented cycling stability with only 5.6 % energy density decay over 200 cycles, outperforming pure CaO (73.5 % degradation after 100 cycles). Kinetic analysis reveals accelerated calcination rates enabled by Mn doping, while DFT calculations confirm an 18.3 % reduction in CaCO 3 decomposition energy barriers. Remarkably, the composite achieves a 3.9-fold enhancement in solar absorptivity through synergistic full-spectrum light harvesting. This work establishes a multifunctional doping strategy that simultaneously addresses sintering resistance, solar absorptance, and reaction kinetics, offering a promising pathway for next-generation concentrated solar power plants requiring high-temperature, long-cycle thermochemical energy storage.
研究领域:
储能材料
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太阳能转换
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热化学
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固态化学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Shulin Liu,Yubin Tang,Xiaona Zhang,Ying Zhang
Infected bone regeneration faces challenges from biofilm resistance and antibacterial material trade-offs. To resolve this, we synthesized lithium-doped mesoporous bioactive glass microspheres (7Li-MBGs) via sol-gel precursor sequence modulation. This optimization maintained structural integrity (~500 nm diameter, 2-5 nm pores) while enhancing long-term antibacterial efficacy (> 90% against S. aureus / E. coli over 14 days). A dual-mechanism strategy operates: Non-ROS lithium release dominates early-phase (1-7 days) bactericidal action via membrane disruption and metabolic interference; controlled ROS-boosted reinforcement sustains late-phase (7-14 days) activity below safety thresholds without osteogenic suppression. Simultaneously, 7Li-MBGs enhance osteoblast ALP activity with safe degradation (14-day Li + release: 5 ppm, << nephrotoxicity limit). This synergy overcomes the trade-off between sustained antibacterial efficacy, biosafety, and osteogenic compatibility in bone repair materials.
研究领域:
生物材料
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纳米技术
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生物医学工程
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材料科学
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抗菌治疗
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组织工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Boxu Xu,Chao Song,Jie Song,Rui Huang,Zhenxu Lin,Yi Zhang,Shaomin Lin,Jun Song
In this study, a series of well-crystallized Yb 3+ /Er 3+ /Tm 3+ -tridoped Y 2 O 3 –ZnO ceramic phosphors were prepared using sol–gel synthesis, and the phosphor structures were studied using X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis . The phosphors had excellent physical stability and porous structure. All phosphors generated blue, green, and red emission bands attributed to Tm: 1 G 4 → 3 H 6 , Er: 2 H 11/2 ( 4 S 3/2 )→ 4 I 15/2 , and Er: 4 F 9/2 → 4 I 15/2 radiative transitions , respectively. The emissions were intensified twice by tuning the Tm 3+ ratio in the host matrix Y 2 O 3 and ZnO parts. The color coordinates were adjusted by tuning both the Tm 3+ concentration and the excitation laser pump power to shift the color coordinates and only enhance the brightness, respectively. Meanwhile, heating phosphors can also linearly adjust the color coordinates of the luminescence. Therefore, it can also be used as a fluorescence thermometer in the field of temperature sensor . The study findings will broaden the phosphor practical application potential.
研究领域:
材料科学
·
光学
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陶瓷
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发光材料
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温度传感
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Wangmei He,Yunfei Xie,Qingguo Xing,Peilong Ni,Yingchao Han,Honglian Dai
Herein, a polyacrylic acid sol-gel method was presented to synthesize rare earth doped calcium phosphate nanocrystals (RE-CaP) as cell bioimaging agent. The effects of calcination temperature, calcination time and PAA concentration on phase composition , morphology, size and luminescence were discussed. In addition, the hemolysis, cytotoxicity, cell uptake and cell imaging of resulting RE-CaP nanocrystals were investigated. Results show that the increases in calcination temperature and time promote the transformation of product from impure crystalline phase (CaCO 3 , CaO) to pure CaP phase. The rise of calcination temperature results in significant enhancement of luminescence intensity. PAA concentration does not influence the crystalline phase composition and its increase leads to a little increase in luminescence intensity. In addition, the co-doping of Gd 3+ improves the luminescence intensity of Eu 3+ emissions. This method achieves the doping of Eu 3+ ions in the crystallographic Ca 2+ I and Ca 2+ II sites of HAP with a preferable occupation at Ca 2+ II site. The resulting RE-CaP nanocrystals (PAA: 0.6 mg/mL, Eu/Gd = 2:1.5, 600 °C, 3 h) show good biocompatibility and can be easily uptaken by cancer cells. The internalized nanocrystals show stable and strong red luminescence under visible wavelengths excitation. In summary, PAA sol-gel method can be used to synthesize biocompatible RE-CaP luminescent nanomaterials for cell bioimaging.
研究领域:
材料科学
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纳米技术
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生物医学工程
·
细胞生物学
✓ 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）