EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Sizhao Zhang,Guangyu Xu,Kunming Lu,Jing Wang,Hui Ji,Zhao Wang,Zhouyuan Yang,Yue Yang,Yunyun Xiao,Feng Ding
Polybenzoxazine aerogel is a new polymer aerogel material developed in recent years, which the ring-opening polymerization of benzoxazine monomer under high temperature or HCl could achieve the formation of cross-linked three-dimensional network structure so that to further reduce the cost of preparation. However, HCl as a catalyst has the disadvantages of easy volatilization and corrosion. Here we introduced Lewis acid as the catalyst for fabricating nanoporous polybenzoxazine aerogels with low density and self-extinguishing properties depending upon the evolution law for the influence of the mixed ratio of Lewis acid and hydrochloric acid (volume ratio) on the corresponding aerogels. The results show that PBz aerogels prepared in the mixed acid environment (with n -hexane as the exchange solvent) have a good three-dimensional nanopore network structure, and the pore size distribution is in the range of 20–140 nm. Additionally, the obvious self-extinguishing performance (even exposing to a flame at 1200 °C), low density and excellent mechanical properties are reflected as well, potentially suggesting the broad application prospects in the field of aerospace.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Wenhao Wu,Yuan Lan,Yaxiong Zeng,Daohui Lin,Kun Yang
Organobentonites, i.e., bentonites coated with surfactants such as cetyltrimethylammonium (CTAB), are superior and low-cost sorbents for removal of organic contaminants from wastewater. Nonlinear sorption of polar organic compounds such as phenols and anilines by organobentonites were widely observed and interpreted by adsorption mechanism. However, in this study, it was observed that the nonlinear sorption of phenols and anilines by CTAB coated bentonites (CTAB-bentonites) should be attributed to nonlinear partition mechanism with the additional space limitation in CTAB-bentonites for nonlinear partitioning, rather than adsorption mechanism. This nonlinear partition mechanism is supported by that (i) organobentonites is a partition medium, identified by the linear isotherms of polycyclic aromatic hydrocarbons (PAHs) and nitrobenzenes ; (ii) sorption coefficients (log K d ), the ratio of adsorbed amount ( q e ) to equilibrium concentration ( C e ), and Dubinin-Ashtakhov (DA) model fitted sorption capacity (log Q 0 ) of organic compounds, by a given CTAB-bentonite, are positively correlated with their octanol-water distribution coefficients (log K OW ) and solubility in octanol (log S o ) respectively; (iii) log K d and log Q 0 of a given organic compound by CTAB-bentonites are positively correlated with organic carbon contents ( f oc ) of CTAB-bentonites, but not specific surface area. Specific interaction (i.e., hydrogen-bonding interaction), in addition to van der Waals force , is responsible for the nonlinear partitioning of phenols and anilines into CTAB-bentonites, because of the positively linear relationship between DA model fitted sorption affinity ( E ) and hydrogen-bonding donor parameter ( α m ) of organic compounds. These results could help the recognizing of the nonlinear sorption behaviors of organic compounds by organobentonites and promote their environmental applications in wastewater treatment .
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MATERIALS LETTERS
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2015
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IF 2.489
Yanze Bi,Yang Zheng,Yan Li
Porous Mg has been prepared by powder metallurgy using spherical polymethyl methacrylate (PMMA) as the space holder. The PMMA is thoroughly decomposed and removed from the porous Mg after being sintered at 400 °C and then 550 °C. Small amount of MgO forms by the effects of decomposition products. The sintered density of porous Mg decreases from 1.72 to 1.05 g cm −3 with increasing content of PMMA from 0% to 30%. The porosity of the porous Mg increases up to 40% with increasing content of PMMA. The ultimate compressive strength ranges between 25 and 170 MPa and decreases with increasing porosity.
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Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 31
·12304-12310
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IF 0
Dahu baiyila,Xiaohui Wang,Xin Li,Bao sharileaodu,Xiaotian Li,Liang Xu,Zongrui Liu,Limei Duan,Jinghai Liu
TiO2 nanofibers integrating space-separated magnetic nanoparticles and heterostructures have been fabricated to construct multifunctional photocatalysts with excellent photocatalytic activity and magnetic recoverability. The electrospinning technique has been employed to prepare the Fe3O4-embedded TiO2 (Fe3O4@TiO2) magnetic nanofibers. TiO2/CdS heterostructures (Fe3O4@TiO2/CdS) formed by depositing CdS nanoparticles onto the Fe3O4@TiO2 nanofibers have been obtained by a hydrothermal process. The heterostructures improve the photocatalytic activity and widen the range of solar light response. Under visible light irradiation, the photocatalytic activity of the Fe3O4@TiO2/CdS nanofibers is 5.11 times higher than that of the Fe3O4@TiO2 nanofibers and is 1.22 times than that of CdS nanoparticles. In addition, it exhibits a slight increase under simulated solar light with the photocatalytic degradation ratio 1.1 times higher than that under visible light. The loading amounts of CdS only have effects on the photocatalytic activity under visible light and simulated solar light. The Fe3O4@TiO2/CdS nanofiber exhibits a saturation magnetization strength of 1.572 emu g−1 and can be effortlessly separated and recovered by applying a contactless magnetic field. The cycling stability is durable after magnetic separation and recycling.
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PLoS One
·
2014
·Vol. 9
·期 12
·e114300
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IF 3.534
Xingchu Gong,Ying Zhang,Jianyang Pan,Haibin Qu
A solvent recycling reflux extraction process for Panax notoginseng was optimized using a design space approach to improve the batch-to-batch consistency of the extract. Saponin yields, total saponin purity, and pigment yield were defined as the process critical quality attributes (CQAs). Ethanol content, extraction time, and the ratio of the recycling ethanol flow rate and initial solvent volume in the extraction tank (RES) were identified as the critical process parameters (CPPs) via quantitative risk assessment. Box-Behnken design experiments were performed. Quadratic models between CPPs and process CQAs were developed, with determination coefficients higher than 0.88. As the ethanol concentration decreases, saponin yields first increase and then decrease. A longer extraction time leads to higher yields of the ginsenosides Rb 1 and Rd. The total saponin purity increases as the ethanol concentration increases. The pigment yield increases as the ethanol concentration decreases or extraction time increases. The design space was calculated using a Monte-Carlo simulation method with an acceptable probability of 0.90. Normal operation ranges to attain process CQA criteria with a probability of more than 0.914 are recommended as follows: ethanol content of 79–82%, extraction time of 6.1–7.1 h, and RES of 0.039–0.040 min −1 . Most of the results of the verification experiments agreed well with the predictions. The verification experiment results showed that the selection of proper operating ethanol content, extraction time, and RES within the design space can ensure that the CQA criteria are met.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Guangwei Shao,Wenlong Huang,Xin Zhang,Junjie Pan,Minghao Li,Hongjie Li,Renbiao Zhang,Bixia Sun,Zhihao Li,Qiusen He,Wenfeng Hu,Siyi Bi,Huiqi Shao,Jinhua Jiang,Nanliang Chen
The extremely cold environment restricts certain activities, making the preparation of a material with both heating and insulation functions a significant challenge. This study presents the large space warp-knitted composite fabric (LSWCF) as an electric heating inflatable material with a three-dimensional structure. It is designed and developed from three modes to mitigate heat loss. The top layer of LSWCF is combined with the electric heating film as the heating layer, showing high electric heating efficiency (577.33 °C/(W·cm–2)), high electrothermal conversion efficiency (95%), and excellent conductivity (12.5 S/cm). The bottom layer of LSWCF is coated with TiO2/WPU coatings as a thermal radiation layer. The inflated LSWCF retains a substantial volume of still air within its middle layer and exhibits low thermal conductivity (0.037 W·m–1·K–1), with resulting minimization of heat loss due to convection and conduction. LSWCF’s radiant coating, on the other hand, reduces heat loss through directed radiation. Contributed to the structural design, the LSWCF demonstrates an enhanced ability to generate heat at low temperatures (up to 35 °C at −20 °C, 980 W·m–2) compared to the existing literature. This study offers a novel strategy for the development of materials for use in extremely cold environments.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 13
·e2321825121
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IF 9.4
Yang Liu,Qiankun Chen,Hongli Zhang,Zeyu Feng,Gang Zou,Douguo Zhang
Label-free optical imaging of single-nanometer-scale matter is extremely important for a variety of biomedical, physical, and chemical investigations. One central challenge is that the background intensity is much stronger than the intensity of the scattering light from single nano-objects. Here, we propose an optical module comprising cascaded momentum-space polarization filters that can perform vector field modulation to block most of the background field and result in an almost black background; in contrast, only a small proportion of the scattering field is blocked, leading to obvious imaging contrast enhancement. This module can be installed in various optical microscopies to realize a black-field microscopy. Various single nano-objects with dimensions smaller than 20 nm appear distinctly in the black-field images. The chemical reactions occurring on single nanocrystals with edge lengths of approximately 10 nm are in situ real-time monitored by using the black-field microscopy. This label-free black-field microscopy is highly promising for a wide range of future multidisciplinary science applications.
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Journal of Energy Storage
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2024
·
IF 8.9
Zijian He,Hongting Ma,Shilei Lu
In order to effectively address the mismatch between thermal energy supply and demand in buildings, latent heat storage (LHS) based on phase change material (PCM) stands out as a key technology. While hydrated salt has emerged as a promising PCM, it encounters common issues such as substantial supercooling, phase separation, and low thermal conductivity , hindering its development. To mitigate these limitations, this study focused on modifying Ba(OH) 2 ·8H 2 O by incorporating various nucleating agents and thickening agents to reduce supercooling, enhancing the composite PCM's thermal properties by introducing expanded graphite (EG) to elevate thermal conductivity . Subsequently, the thermal stability of the PCM was evaluated through accelerated thermal cycling tests, encompassing the assessment of critical thermal parameters, including supercooling degree, enthalpy, and thermal conductivity of the composite PCM. Experimental findings unveiled the effectiveness of incorporating 2 wt% BaCl 2 ·2H 2 O and 1 wt% CMC to Ba(OH) 2 ·8H 2 O, effectively diminishing the supercooling degree from 14 °C to 1.42 °C. Further integration of 3.5 wt% EG led to a substantial decrease in the supercooling degree to 0.24 °C. Simultaneously, the addition of EG resulted in an improvement in thermal conductivity , elevating it from 0.62 W/(m·K) to 1.03 W/(m·K), while the enthalpy decreased from 283.68 J/g to 252.81 J/g. Notably, the composite PCM exhibited notable thermal reliability with a latent heat drop of 15.9 % following 1000 accelerated cycles of testing. Moreover, the composite PCM demonstrated superior thermal storage density, measuring at 2.36 times that of traditional paraffin wax , yet with a thermal storage cost merely a quarter of paraffin wax, rendering it more favorable for extensive deployment in building energy systems .
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Advanced Materials Technologies
·
2025
·
IF 6.2
Shixiang Lin,Chengfeng Sun,Yuhan Huang,Bin Cheng,Heng Luo,Minglu Zhu,Tao Chen,Fengxia Wang,Lining Sun
Gesture recognition based on machine-learning approaches plays a pivotal role in advancing Human–machine Interaction (HMI) and robotics. Typical smart glove solutions with flexible sensors can only recognize discrete gestures, not sentences, and fail to meet the daily communication needs of signers. Moreover, current interfaces for displaying recognition outcomes are mostly confined to smartphones or computers, limiting seamless communication between signers and non-signers. Herein, we propose an artificial intelligence hand gesture recognition HMI system consisting of an intelligent sensing glove, a machine learning module, and a virtual reality interface. This system represents a substantial leap forward in gesture recognition technology with adaptability, comfort, and lightweight construction. Enhanced by advanced machine learning algorithms, it achieves remarkable accuracy across a diverse range of gestures—including 10 numeric gestures, 14 alphabetic phrases, and 5 sentence patterns—boasting 99.5% accuracy for numeric and 99.3% accuracy for alphabetic recognition and an impressive 98.8% accuracy for sentence-level interpretation. The system projects recognition results into a virtual space, translating gestures into text in real time. This functionality facilitates not only human–machine interaction but also inter-human communication, particularly bridging the gap between signers and non-signers. It underscores its potential for practical implementation in next-generation HMI systems.
研究领域:
人机交互
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人工智能
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可穿戴电子
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机器人学
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虚拟现实技术
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 43
·1804394
·
IF 13.325
Junpeng Zeng,Xiaoming Li,Ye Wu,Dandan Yang,Zhiguo Sun,Zehao Song,Hao Wang,Haibo Zeng
All-inorganic halide perovskite is considered as outstanding candidate of organic–inorganic hybrid perovskite due to its superior stability. However, the low solubility of precursor and uncontrollable film growth result in poor film quality and impede the application of polycrystalline films greatly. In this work it is reported on a space-confined growth strategy to overcome the low solubility and fast crystal growth disadvantages via freezing the precursor solution within the gaps of ordered polystyrene sphere templates. Then, the dense CsPbBr 3 polycrystalline films realize low trap density (3.07 × 10 12 cm −3 ) and high carrier mobility (9.27 cm 2 V −1 s −1 ) after stoichiometric modulation. Photodetectors based on these films exhibit high performance in all figures of merit. Specifically, high responsivity up to 216 A W −1 and ultrashort response time (<5 µs) are achieved, which are better than those of all the CsPbBr 3 based PDs. A record detectivity of 7.55 × 10 13 and 3.1 × 10 5 Hz −3 dB bandwidth are also achieved. This work opens the window of high quality all-inorganic halide perovskite polycrystalline films and can be extended to rational application of more optoelectronic devices including solar cells, photoelectrodes, and ray detectors.
研究领域:
材料科学
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光电技术
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纳米技术
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 13
·7093-7099
·
IF 7.443
Jiaoxing Xu,Qiangmin Yu,Lunhui Guan
Hierarchically nanoporous N-doped carbon nanowires (N-CWs) were prepared by a novel space-confinement-induced assembly strategy, for which nitrogen-enriched pyrimidine and anodic aluminium oxide (AAO) template bearing metal oxides are employed as precursor and nanoscale channels, respectively, and the Fe/Co metal oxide not only blocks the AAO surface from the original surface-templating carbonization, but also introduces nanoporosity with acid etching. Thus-obtained carbon nanowires composed of N-doped graphene-like carbon nanosheets not only contain a high N content (up to ∼12%), but also possess a hierarchically meso/microporous structure (∼1.3 cm3 g−1) with high specific surface area (∼455 m2 g−1). This protocol allows for the simultaneous optimization of graphitization, porous structure and surface functionalization. As a result, the prepared N-CWs demonstrate an attractive electrocatalytic capability towards oxygen reduction reaction (ORR). Specifically, in addition to the improved kinetic current density and overpotential, the N-CWs prepared at 700 °C show the optimized ORR performance with an electron-transfer number of ∼4.0, which very close to that of a commercial Pt/C catalyst.
研究领域:
材料科学
·
电化学
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PLoS One
·
2015
·Vol. 10
·期 5
·e0128236
·
IF 3.234
Xingchu Gong,Yao Li,Huali Chen,Haibin Qu
A design space approach was applied to optimize the extraction process of Danhong injection. Dry matter yield and the yields of five active ingredients were selected as process critical quality attributes (CQAs). Extraction number, extraction time, and the mass ratio of water and material (W/M ratio) were selected as critical process parameters (CPPs). Quadratic models between CPPs and CQAs were developed with determination coefficients higher than 0.94. Active ingredient yields and dry matter yield increased as the extraction number increased. Monte-Carlo simulation with models established using a stepwise regression method was applied to calculate the probability-based design space. Step length showed little effect on the calculation results. Higher simulation number led to results with lower dispersion. Data generated in a Monte Carlo simulation following a normal distribution led to a design space with a smaller size. An optimized calculation condition was obtained with 10000 simulation times, 0.01 calculation step length, a significance level value of 0.35 for adding or removing terms in a stepwise regression, and a normal distribution for data generation. The design space with a probability higher than 0.95 to attain the CQA criteria was calculated and verified successfully. Normal operating ranges of 8.2-10 g/g of W/M ratio, 1.25-1.63 h of extraction time, and two extractions were recommended. The optimized calculation conditions can conveniently be used in design space development for other pharmaceutical processes.
研究领域:
中药学
·
制药工程
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危险品化学品经营许可证（带存储）