Journal of Materials Chemistry A
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2018
·Vol. 6
·期 36
·17713-17723
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IF 9.931
Xiang Ke,Shuangfeng Guo,Gensheng Zhang,Xiang Zhou,Lei Xiao,Gazi Hao,Ning Wang,Wei Jiang
In this study, to improve the safety in the preparation process of energetic materials, vacuum freeze-drying technology is applied to develop nanoenergetic thin films in which Al nanoparticles (Al NPs) are used as the fuel and polyvinylidene fluoride (PVDF) powders act as the oxidant. The whole process effectively avoids high temperature and thus ensures operational safety. The morphology and composition characterizations confirm that Al NPs are dispersed uniformly in the hydrophobic energetic binder, endowing the films with increased water-proof, anti-aging and anti-corrosion characteristics. The results of thermal analysis show that a pre-ignition reaction (PIR) destroys the Al2O3 shell and a sharp exothermic peak from the reaction between the exposed Al core and PVDF is found before the melting point of Al. Combustion tests reveal that the film with the highest content of Al NPs possesses the fastest flame propagation speed. The preliminary reaction mechanism obtained by probing the reaction products and intermediates suggests that a two-step reaction exists when the film is slowly heated in N2, while a competitive reaction between oxidation and fluorination of Al NPs is observed when the film burns in air. These results indicate the promising potential of vacuum freeze-drying technology in manufacturing nanoenergetic materials.
研究领域:
材料科学
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化学工程
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纳米技术
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能量材料
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DOI
高影响因子
RSC Advances
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2018
·Vol. 8
·期 22
·12315-12321
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IF 2.936
Lixian Xu,Di Wu,Bingrong Zhou,Yang Xu,Wenjuan Wang,Dinghua Yu,Dan Luo
Sunscreen is believed to protect human skin from photo damage due to UV exposure. However, substantial concerns remain associated with skin contact with UV filters and the subsequent reactive oxygen species from photoactivation of UV filters. Herein, we show that the microencapsulation of octyl p-methoxycinnamate (OMC), a typical UV filter, into the nanoporous structure of zeolitic imidazole frameworks (ZIF-8) prevents the skin exposure to UV filters while improving UV protection performance. Meanwhile, the UV filter photostability has been obviously improved due to the nanoconfinement effect. Microencapsulated OMC in ZIF-8 adhered to the stratum corneum could not only reduce OMC transdermal penetration, but also prevent skin exposure to the deleterious reactive oxygen species (ROS) from photoactivation of OMC. Therefore, this microencapsulated UV filter system based on a metal organic frameworks microporous polymer would find important applications in skin care products through providing safe and effective UV protection.
研究领域:
材料科学
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皮肤病学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2016
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IF 6.333
Tianqiao Yong,Lingzhi Zhang,Jinglun Wang,Yongjin Mai,Xiaodan Yan,Xinyue Zhao
Three choline-based ionic liquids functionalized with trimethylsilyl, allyl, and cynoethyl groups are synthesized in an inexpensive route as safe electrolytes for high-voltage lithium-ion batteries. The thermal stabilities, viscosities, conductivities, and electrochemical windows of these ILs are reported. Hybrid electrolytes were formulated by doping with 0.6 M LiPF6/0.4 M lithium oxalydifluoroborate (LiODFB) as salts and dimethyl carbonate (DMC) as co-solvent. By using 0.6 M LiPF6/0.4 M LiODFB trimethylsilylated choline-based IL (SN1IL-TFSI)/DMC as electrolyte, LiCoO2/graphite full cell showed excellent cycling performance with a capacity of 152 mAh g -1 and 99% capacity retention over 90 cycles at a cut-off voltage of 4.4 V. The propagation rate of SN1IL-TFSI)/DMC electrolyte is only one quarter of the commercial electrolyte (1 M LiPF6 EC/DEC/DMC, v / v / v = 1/1/1), suggesting a better safety feature.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Hui Li,Yunqing He,Jin Yang,Xin Wang,Tianqing Lan,Lincai Peng
We presented a facile method for preparing a food-safe superhydrophobic packaging paper with improved moisture and air barrier properties in this study, which is combining construction of polymer-nanoclay hybrid multilayers with subsequent carnauba wax treatment. The polymer-nanoclay hybrid multilayers consisting of quadlayers of carrageenan (CR)/chitosan (CS)/montmorillonite (MMT)/CS were created using layer-by-layer (LbL) assembly. The surface chemical compositions, potentials and morphologies of the CR/CS/MMT/CS multilayer-modified paper samples were investigated. The paper sample modified with a wax-treated (CR/CS/MMT/CS) 2 multilayer gave a water contact angle of 151.4°. Compared with original paper, this superhydrophobic paper sample showed comparable tensile strength and excellent barrier properties against water vapor and air. Moreover, the obtained paper was used for strawberries packaging at ambient temperature, and it was very effective at reducing the weight loss and maintaining titratable acidity compared with the unpackaged strawberries, which might has a great potential as food packaging materials.
研究领域:
材料科学
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食品科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Lan-ying Guo,Qi-sheng Xia,Jing-lei Qin,Mu Yang,Ting-yu Yang,Fang-tian You,Zhi-hua Chen,Bei Liu,Hong-shang Peng
Although photodynamic therapy (PDT) has been extensively studied as an established modality of cancer treatment, it still suffers from a few clinical limitations, such as skin phototoxicity and tumor hypoxia. To circumvent these hurdles, hollow silica mesoporous nanoparticles (HMSNs) loaded with photosensitizers were employed as the nanoplatform to construct multifunctional nanoparticles (NPs). Specifically, an ultra-uniform polydopamine (PDA) shell was highly controlled grown around HMSNs by photogenerated outwards-diffused 1 O 2 , followed by conjugation of folic acid-poly(ethylene glycol) and chelation of Fe 2+ ions. Thanks to the optimal thickness of light-absorbing PDA shell, the multifunctional NPs exhibited not only negligible skin phototoxicity but also efficient 1 O 2 generation and photothermal (PT)-enhanced • OH generation upon respective photoirradiation. Anti-tumor therapy was then performed on both 4 T1 tumor cells and tumor-bearing mice by the combination of 638 nm PDT and 808 nm PT-enhanced chemodynamic therapy (CDT). As a result, high therapeutic efficacy was achieved compared to single-modality therapy, with a cell inhibitory rate of 86% and tumor growth inhibition of 70.4% respectively. More interestingly, tumor metastasis was effectively inhibited by the synergetic treatment. These results convincingly demonstrate that our multifunctional NPs are very promising skin-safe PDT agents combined with CDT for efficient tumor therapy.
研究领域:
纳米技术
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癌症治疗
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
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2022
·
IF 5.204
Qiu Shi,Siqi Huo,Cheng Wang,Guofeng Ye,Lingfeng Yu,Zhengping Fang,Hao Wang,Zhitian Liu
The implementation of current flame-retardant strategy is often accompanied by the deterioration of other properties, e.g., mechanical and optical properties. Herein, a flame-retardant, hyperbranched polymer was synthesized by using trichlorovinylsilane (TVS), triethylenetetramine (TETA) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) as raw materials, which was named as TTD and applied to epoxy resin (EP). Our result shows that TTD is able to catalyze and participate in the curing of EP. Furthermore, the EP-TTD samples exhibit high transparency, glass-transition temperature and good UV-blocking properties at a low TTD addition (≤ 4 wt%). Notably, TTD enhances the toughness and robustness of EP. The elongation at break, tensile strength, flexural strength, and impact strength of EP containing 4 wt% TTD are 54%, 42%, 29%, and 29% higher than those of pure EP. Meanwhile, the incorporation of 7 wt% TTD endows EP with a limiting oxygen index (LOI) of 40.0%, a UL-94 V-0 rating, and a 13% reduction in total smoke production (TSP), indicating the significantly enhanced fire safety. During burning, TTD exerts promoting carbonization and quenching effects to suppress the heat transfer and smoke release. Therefore, this work provides an effective strategy to fabricate high-performance, fire-safe epoxy resins using P/Si-containing, hyperbranched polymers.
研究领域:
材料科学
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高分子化学
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消防安全工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yunhan Bai,Xiaoshu Ding,Ying Sun,Yucong Song,Yanji Wang
The reverse water gas shift (RWGS) reaction is one kind of the catalytic conversion of CO 2 to reduce an enormous amount of CO 2 . However, the RWGS reaction has the safety hazards associated with the use of hydrogen and thermodynamic limitation. Therefore, this work proposes a new safe and efficient reaction route (CO 2 -MCH) to get CO from CO 2 and methylcyclohexane (MCH). Thermodynamic calculations showed that the equilibrium CO 2 conversion at 350 °C increased from 17.8 % of the RWGS reaction to 53.5 % of the CO 2 -MCH reaction. In the CO 2 -MCH reaction, the relationship of the catalytic performance with the metal dispersion, the Pt particle size and the acidity of Pt-based catalysts on the different supports was investigated, respectively. The results showed that the Pt/γ-Al 2 O 3 catalyst with high dispersion of Pt particles, small particle size and medium acidity had good activity and selectivity. The relationships among Pt loading and Pt particle size on the Pt/γ-Al 2 O 3 catalyst and the catalytic performance were evaluated. The Pt particle size gradually increased with the metal loading. A positive correlation was observed between Pt particle size and CO 2 conversion; a volcano-type relationship was observed between CO selectivity and Pt particle size. In the CO 2 -MCH reaction at 350 °C, 0.1 MPa, LHSV = 6 h −1 , the CO 2 conversion was 24.7 %, the CO selectivity reached 95.2 %, and the Pt/γ-Al 2 O 3 catalyst within 40 h showed good stability. Moreover, the mechanism of the CO 2 -MCH catalytic reaction over the Pt/γ-Al 2 O 3 catalyst was speculated.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Hui Li,Hui Chen,Xiaohui Shen,Xingwei Liu,Yongjin Fang,Faping Zhong,Xinping Ai,Hanxi Yang,Yuliang Cao
Sodium metal is a promising anode for high-energy-density sodium rechargeable batteries (RSBs). However, the low Coulombic efficiency (CE) of the Na plating/stripping process and the problem of safety hinder their practical application. Herein, we report a facile strategy for employing the fluorinated phosphate solvents to realize highly reversible Na plating/stripping and improve the safety performance. The fluorinated phosphate molecules reduce the polarity of the solvent and lower the coordination number to Na+, which makes it possible to form the anion-induced ion–solvent-coordinated (AI-ISC) structures with high reduction tolerance. Moreover, the fluorination treatment enhances the oxidation resistance of the phosphate solvent, enabling compatibility with the high-voltage Na3V2(PO4)2F3 (NVPF) cathode. As expected, the Na@Al//NVPF full cell with the as-prepared 0.9 M NaFSI/tris(2,2,2-trifluoroethyl) phosphate (TFEP) demonstrates a capacity retention of 83.4% after 200 cycles with an average CE of 99.6%. This work opens a new avenue for designing high-energy-density RSBs with improved safety performance.
研究领域:
材料科学
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电化学
·
能量存储
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Miao Liu,Kexin Chen,Yongqian Shi,Shijie Wu,Hengrui Wang,Ruizhe Huang,Chenxin Nie,Yuezhan Feng,Libi Fu,Pingan Song
To meet the demand for practical applications, it is imperative to develop flexible electromagnetic interference (EMI) shielding materials with fire safety. In this work, highly fire safe and flexible thermoplastic polyurethane (TPU)-based EMI shielding nanocomposites were prepared via melt blending polyphenyl phosphate ester amide (PPPEA) with MXene/carboxylic multiwalled carbon nanotubes hybrid (MC), air-assisted thermocompression and layer-by-layer stacking. Combining PPPEA with MC led to peak of heat release rate, total heat release and total smoke release of TPU nanocomposite containing 5.0 wt% PPPEA and 2.0 wt% MC decreased by 39.0%, 24.5% and 23.8%, respectively. Furthermore, the hierarchical TPU/5PA/2.0MC/carbon fiber cloth (CF) nanocomposite showed a prominent averaged EMI shielding effectiveness (SE) of 35.5 dB and a high normal SE value of 29.6 dB/mm, which were superior to most previously reported results. Catalytic carbonization of PPPEA and multiply reflected and scattered effect of MC together with continuous conductive network of CF were responsible for the improvement of these performances.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Tiancheng Chu,Yong Zhang,Linghao Kong,Kuiling Li,Zhichao Zhao,Lili Xu,Xiaohui Wu,Jun Wang
Sulfide precipitation is a popular technique for the treatment and resource recovery of arsenic-containing dirty acid wastewater. However, this approach frequently suffers from toxic hydrogen sulfide (H 2 S) escape and agent wastage issues. Herein, a safe and efficient technique is proposed based on a polytetrafluoroethylene membrane contactor wherein the mass transfer resistance of the gas, membrane, and liquid phases can be easily and independently regulated to control the H 2 S supply. Additionally, H 2 S is transferred in bubble-free form, fundamentally avoiding the issue of gas escape, and uniform membrane distribution contributes to evenly distributed H 2 S delivery. The results demonstrated that 99.3 % arsenic precipitation could be achieved and the H 2 S emission ratio was limited to < 0.12 %, which was significantly better than traditional methods. Thus, highly efficient separation and resource recovery of heavy metals in wastewater can be achieved using this unique and controllable low-dose H 2 S supply method. The separation factor between copper and arsenic was as high as 7490.9. This study provides a safe, reliable, and promising new approach for the treatment of arsenic-containing acidic wastewater.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
Pigment & Resin Technology
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2024
·
IF 1.3
Xinrui Wang,Xiaomeng Hu,Xiangnan Feng,Xinyu Han,Qi Liu,Yueqin Li
PurposeThis study aims to produce composite pigments, including SHS/ZnAl-LDHs, IDS/ZnAl-LDHs and SNND/ZnAl-LDHs, with improved coloration, enhanced photostability and thermostability and biocompatibility.Design/methodology/approachThe chemical structures of the composite pigments were characterized by X-ray diffraction spectroscopy and Fourier transform infrared spectroscopy. Photostability and thermal stability were assessed using ultraviolet-visible spectroscopy and colorimetry. The coverage of the dyes was determined through black-and-white tile testing, and specific RGB values were used to indicate color expressiveness. Finally, a four-color eyeshadow was formulated, and safety tests were conducted via human patch test and cellular assays to confirm the safety and reliability of the samples.FindingsThe experimental results demonstrate an enhancement in the photo and thermal stability of the SHS/ZnAl-LDHs, IDS/ZnAl-LDHs and SNND/ZnAl-LDHs composites, along with their superior performance in terms of covering power and color saturation. These composite pigments also exhibit high safety, making them well-suited for cosmetic applications.Practical implicationsThe composite pigments based on hydrotalcite can be used in the cosmetic industry without causing any harm to the environment and human health.Originality/valueThe addition of hydrotalcite enables better application of pigments in cosmetics.
研究领域:
化妆品科学
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材料化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Hao Deng,Yanling Wu,Leyi Li,Xiaojia jiang,Peng Wang,Kui Fang,Jun Li,Derek Hao,Huayue Zhu,Qi Wang,Qiang Li
To tackle the issues of low adsorption capacity, poor regeneration efficiency, and limited recoverability in wastewater treatment adsorbents, we innovatively developed a low−cost Fe(III)−SA gel ball aerogel (FA) through a simple chemical crosslinking method. FA aerogel exhibits exceptional adsorption performance for a wide range of antibiotics, including norfloxacin (NOR), ciprofloxacin (CIP), and tetracycline hydrochloride (TC), showcasing its broad applicability. Remarkably, FA achieved a maximum NOR adsorption capacity of 338.4 mg/g (Langmuir isotherm model, pH 7.0, 298 K, m/V=0.1 g/L). Furthermore, under the synergistic effect of photocatalysis, FA demonstrated a breakthrough by removing 97 % of NOR (30 mg/L, 50 mL) within just 150 min. Notably, FA displayed innovative regeneration capabilities, successfully completing 10 continuous and stable NOR removal cycles without loss of performance. The DFT calculations alongside experimental evidence were employed to elucidate the NOR degradation pathway, while electron density distribution and Fukui function analysis confirming the proposed degradation pathways through HPLC−MS results. Moreover, plant stress and zone of inhibition tests verified that the degradation intermediates were significantly less toxic, ensuring the safety of the regeneration process. This research introduces an innovative approach for designing superior adsorbents and provides critical insights into efficient and sustainable adsorbent regeneration.
研究领域:
环境科学
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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
危险品化学品经营许可证（带存储）