JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yuanjie Wang,Luke Ma,Xueliang Pei,Wanfeng Zhuo,Jing Huang,Qing Huang
The inevitable residual carbon that normally appears in the polycarbosilane-derived SiC ceramics has notorious effects on the crystallinity and thermal conductivity of SiC ceramic. In this study, nano Si was employed to fully exhaust unwanted residual carbon in a liquid polycarbosilane. Through addition of 12 wt% theoretical nano Si and pyrolysis to 1600 °C, the ceramic yield of the liquid polycarbosilane increased from 72.0 wt% to 81.8 wt% and the C/Si ratio of ceramic product decreased from 1.14 to 0.99. Raman spectroscopy and transmission electron microscope also confirmed that the residual carbon almost completely disappeared. In addition, the crystallization ability of SiC also improved, and as a result dramatical improvement in the thermal conductivity of SiC f /SiC composite was achieved. The reaction mechanism was investigated in detail to understand the residual carbon trapping effect of nano Si during the precursor-to-ceramic conversion.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Jin Wang,Shiyu Zhou,Qiang Zhang,Guo-Ping Lu,Yamei Lin
Bio-based tannic acid (TA) has been first applied as a reactive flame retardant for the preparation of polyurethane elastomers (PUEs). The flame retardant properties of PUEs are evaluated by limiting oxygen index (LOI), cone calorimeter test (CCT), thermogravimetric analysis (TGA), scanning electron microscope (SEM) and Raman tests, which confirm the flame retardant of TA for PUE owing to its polyphenol and cross-linked aromatic structure . When 5 wt% of TA is involved, the LOI value of the sample (PUE4) increases to 40%. According to CCT, TGA, SEM and Raman tests, the introduction of TA can reduce the heat release of PUE and greatly promote the generation of carbon residue during combustion. The flame retardant mechanism of PUEs is also investigated by TGA-FTIR test, indicating that TA inhibits the generation of combustible gas during combustion. Compared with PUE1, the elongation at break of TA-modified PUEs decreases obviously due to the presence of benzene ring structure (474.5–632.7%), but their tensile strength increases significantly owing to the hydroxyl groups and cross-linked structure of TA (14.8–31.1 MPa).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Zhipeng Li,Ruochun Zhang,Jun Huang,Dandan Yu,Zhanjun Cheng,Guanyi Chen,Peizhe Sun
The continuously growing of municipal solid waste (MSW) has posed a threat to human-being. Pyrolysis is a promising technique for MSW disposal, as it can reduce its volume and produce valuable products as well. This study evaluated the potential of carbon residue (CR) derived from waste carton as soil amendment. Additionally, considering the waste plastics, such as plastic bags, plastic tape, etc., can mix with carton in MSW, the effect of polyvinyl chloride (PVC) addition on the characteristics of CR and its environmental behavior was measured. Results showed that the CR derived from carton exhibited notable efficacy in adsorbing Cd 2+ (56.111 mg/g), pesticides and PO 4 3− (0.231 mmol/g), thereby mitigating pollutants and immobilizing nutrient in soil environment. The introduction of PVC was found to enhance the adsorption of CR for Cd 2+ (65.623 mg/g) and PO 4 3− (0.524 mmol/g), albeit exhibiting diminished performance in the removal of pesticides. Different from previous studies, this study revealed that the dissolved black carbon (DBC) released from CRs did not generate reactive oxygen species (ROS) effectively under solar irradiation, and the light screening of DBC can mitigate the photodegradation of pollutants. Furthermore, both CRs increased bacterial luminescence by approximately 70%, which indicated that no toxicity produced during the pyrolysis process. And gas chromatography-mass spectrometry (GC-MS) revealed the absence of polyaromatic hydrocarbon (PAH) in CRs. In summary, this study may provide some new insights on the disposal of MSW, and the CR made by MSW could be effective in soil amendment and reduce the leaching of pollutants and nutrient.
研究领域:
环境科学
·
土壤学
·
废弃物管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS ES&T Engineering
·
2023
·
IF 7.1
Zhipeng Li,Xu Zhang,Yuan Meng,Hong Yao,Zhanjun Cheng,Guanyi Chen,Peizhe Sun
The recent significant increase in the amount of municipal solid waste (MSW) is a remarkable environmental issue. Pyrolysis is a promising thermal treatment process, as it can reduce MSW and produce some valuable products as well. This study evaluated the potential of the carbon residue (CR) as an efficient H2O2 activator. The CR was produced from the copyrolysis of a mixture of abandoned cartons and plastic wraps, which are becoming increasingly dominant in MSW. The results show an interesting interaction between cartons and PVC, that the introduction of PVC into the carton greatly enhanced the activation rates of H2O2 by CR below the ratio of 0.2:1 (PVC/carton, w/w), whereas higher PVC content lowered its activation ability. EPR signals under different conditions revealed that CR directly activated H2O2 to mainly produce •O2–, which was responsible for pollutant degradation. A mechanistic study suggested that the rates of H2O2 activation were mainly governed by two factors: the amount of oxidative sites on CR and the conductivity of CR, which both were also quantitatively correlated with the activation rates of H2O2. Surface defects and surface-bound radicals were attributed to the two factors, respectively. The introduction of a limited amount of PVC to the carton greatly increased both factors mainly contributed from the generation of HCl during pyrolysis of PVC. In summary, this study may provide some new insights on the catalytic features of CRs, which are generated from the pyrolysis of a mixture of abandoned plastic wraps and cartons.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Muyi Zhang,Yuhao Liu,Bo Yang,Xuetian Lin,Yue Lu,Jiajia Zheng,Chao Chen,Jiang Tang
CuPbSbS3 (bournonite) has emerged as a promising light-absorbing material for thin-film solar cells due to its attractive photophysical properties. The crystallinity of CuPbSbS3 films is a main challenge of achieving high power conversion efficiency. Herein, we perform a series of optimization strategies to enhance the crystallinity of CuPbSbS3 films, including adjusting the annealing temperature and reducing the carbon residue. The optimized CuPbSbS3 film acquires an enhanced crystallinity, and an optimal solar cell device based on it achieves a power conversion efficiency of 2.65% with good stability. This efficiency is the highest value for CuPbSbS3 solar cells up to now.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Huadong Fu,Yan Qin,Zhengwei Peng,Jipeng Dou,Zhixiong Huang
Lightweight phenolic matrix composites are highly potential in ablative thermal protective materials for future aerospace vehicles, and hybrid modification is considered as one of effective ways to improve the oxidation and ablation resistance of phenolic matrix. Herein, the co-continuous silica zirconium hybrid phenolic resin (SZRx) was synthesized, which can be used to prepare lightweight ablation resistant aerogel composites by the sol-gel method. The SZRx aerogel showed stable porous structure and excellent hydrophobicity, and the silicon zirconium hybrid greatly improved the high temperature carbon residue and oxidation resistance of phenolic resin. The SZRx aerogel composites also possessed excellent integrated characteristics of heat protection and insulation, with a linear ablation rate as low as 0.032 mm/s and a back temperature below 200 °C. The synergistic effect of silicon and zirconium formed the multiphase ceramic layer (C, SiO 2 , SiC and ZrO 2 ) with the sea-island-like structure on the surface of the composite material, which can effectively resist high-temperature ablation and aerodynamic exfoliation. This can indicate that silicon zirconium dual element hybrid phenolic resin is the highly competitive matrix for lightweight and ablation resistant composite materials.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2020
·Vol. 22
·期 11
·3597-3607
·
IF 9.48
Hai-Qin Xiao,Wen-Hui Zhou,Dong-Xing Kou,Zheng-Ji Zhou,Yue-Na Meng,Ya-Fang Qi,Sheng-Jie Yuan,Qing-Wen Tian,Si-Xin Wu
Cu2ZnSn(S,Se)4 (CZTSSe) solar cells have been receiving considerable attention in recent years, owing to their low cost and toxicity as well as a high abundance of their constituent elements. Solution-based (mainly precursor solution) methods have been widely used in the fabrication of CZTSSe-based thin film solar cells. Though most record solar cells since 2009 have been achieved using solution-based methods, carbonaceous residues are always formed during post deposition treatment (PDT). These carbonaceous residues are detrimental to grain growth of CZTSSe to form large grains. The presence of unwanted small grain layers will increase the series resistance and reduce the fill factor of the solar cell, thus consequently decreasing the efficiency of CZTSSe solar cells. Herein, we propose “green” supercritical carbon dioxide (SCCO2) treatment to overcome the challenge of carbonaceous residues. FT-IR, SEM, XRD and Raman characterization studies were used to confirm the reduction of carbonaceous residues in CZTSSe films. The solar cell fabricated from a selenized CZTSSe precursor film with SCCO2 treatment under optimal conditions showed the best conversion efficiency of 11.23% (VOC = 0.456 V, JSC = 36.6 mA cm−2, FF = 67.1%). To the best of our knowledge, this is the first report on boosting the efficiency of solution-based CZTSSe solar cells by using SCCO2 treatment. In addition, this unique SCCO2 treatment may also bring forth new ideas for other solution-based optoelectronic devices.
研究领域:
材料科学
·
太阳能
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Han Lin,Liying Qian,Junrong Li,Yu Song
Organic vehicle carbon residue after sintering of copper-terminated electronic pastes for multilayer ceramic capacitors (MLCC) under nitrogen atmosphere has been a challenge. In this work, thermal degradation of ethyl cellulose with different molecular weights was investigated using TG-FTIR, and it is found that the volatilization rate of CH 4 and CO 2 of ethyl cellulose rose with the increase of molecular weight, and the residual rate of ethyl cellulose with 5.0 × 10 4 was only 1.29 % at 800 °C. The molecular weight of ethyl cellulose also shows a great influence on the rheological properties of copper terminal paste, the phase angle of copper pastes gradually decreases with the increasing molecular weight of ethyl cellulose, from viscous liquid to elastic solid. For the copper terminal paste, which is prepared by ethyl cellulose with molecular weight between 4.6 × 10 4 and 5.0 × 10 4 , the end termination morphology is good and the densification of the sintered copper paste is more than 99.5 %, which has satisfactory rheological and sintering properties. This work clarifies the effect of thickener on electronic paste and provide guidance for the design of organic vehicle and electronic paste.
研究领域:
材料科学
·
化学工程
·
电子工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2020
·
IF 4.762
Na Wang,Hao Liu,Jing Zhang,Miao Zhang,Qinghong Fang,Deyi Wang
In this paper, GO-BN(graphene oxide grafted boron nitride) was synthesized from graphene oxide and boron nitride by silane coupling agent KH550. Furthermore, GO-BN and intumescent flame retardant (IFR) were added into natural rubber (NR) simultaneously to improve its flame retardancy. The structure of GO-BN was studied by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The analysis showed that GO-BN was successfully synthesized. The enhanced flame retardancy performance of flame retardant natural rubber (FRNR) was evaluated by limiting oxygen index (LOI) and UL-94 tests. Moreover, the combustion action of FRNR in fire was evaluated by cone calorimetry. Notably, the results showed that the sample with a GO-BN content of 12 phr showed the best flame retardancy performance. The heat release rate (HRR) and total heat release rate (THR) were remarkably decreased by 42.8% and 19.4%, respectively. Carbon residues were analyzed by infrared spectroscopy and scanning electron microscopy, which showed that GO-BN and IFR had a synergistic catalytic effect. The formation of compact thermal stable carbon layer after combustion was the key to protect engineering materials from combustion.
研究领域:
材料科学
·
高分子化学
·
消防安全工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 25
·11985-11993
·
IF 3.925
Xiaoyan Liu,Yanlong Sui,Pengyu Guo,Rui Chen,Jianxin Mu
The application safety of rigid polyurethane foam (RPUF) is greatly restricted by its flammable characteristics, and the existing inorganic flame retardants have dispersibility and compatibility problems with organic matrices. Taking advantage of the good coating performance and chemical structure of biomass polydopamine (PDA), an inorganic additive flame retardant aluminium hydroxide (ATH) with biomass surface modification was prepared. The effects of unmodified and silane coupling agent modified flame retardants on the thermal, mechanical, and flame retardant properties of RPUF were compared. The study found that the overall performance of the composite material was maximized by PDA by enhancing the interaction between ATH and the matrix. Compared with RPUF and RPUF/ATH, the compressive strength of RPUF/ATH@PDA increased by 3.4% and 10.0%, respectively, and the ultimate flexural strength surged by 26.5% and 30.3%. Compared with RPUF and RPUF/ATH, the addition of ATH@PDA reduced the peak heat release rate of RPUF composites by 39.9% and 24.9%, and the total heat release by 33.6% and 31.9%. In addition, PDA promoted the conversion of RPUF to a dense and highly graphitized carbon residue during combustion and reduced the flammable and harmful gases in the combustion gas. It played a crucial role in the condensed and gas phases, which minimized the fire hazard of RPUF.
研究领域:
材料科学
·
高分子化学
·
消防安全工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Fei Zhong,Xubin Yang,Chunlin Chen,Mingwu Wang,Bin Wang,Hong Xia,Jiaming Song
The abundant C, P, and N elements in the structure of adenosine triphosphate (ATP) can act as carbon, acid, and gas sources, and thus can be used as an efficient intumescent flame retardant. Here, a layer of polydopamine (PDA) with polyhydroxyl groups was firstly loaded on the surface of BN to provide a bridging effect for the surface modification of BN. Then, ATP-Cu was immobilized on the BN surface by complexation of ATP with Cu 2+ , resulting in an efficient inorganic-organic-metal composite flame retardant (BNP@ATP-Cu). This composite flame retardant effectively combined the high barrier effect of BN, the high swelling property of ATP and the catalytic carbon formation activity of Cu 2+ . The experimental results revealed that the EP loaded with BNP@ATP-Cu showed the lowest backside temperature (171.2 °C), indicating the highest thermal barrier effect. Moreover, BNP@ATP-Cu/EP exhibited the most significant swelling characteristics (22.7 mm, 17.46) and smoke suppression effect (42.8 %). In contrast, the carbon residue of BNP@ATP-Cu/EP (30.8 %) was significantly higher than that of the other coated samples, which was related to the combined effect of BN and ATP-Cu. The above relevant results fully demonstrated the effectiveness of the composite flame retardants in improving the fire resistance of epoxy coatings.
研究领域:
材料科学
·
化学工程
·
消防安全科学
✓ 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）