International Journal of Applied Ceramic Technology
·
2022
·Vol. 19
·期 5
·2533-2544
·
IF 2.328
Changxi Jiang,Yinghua Zhuang,Jianjun Wang,Shengjun Liao,Lijuan Zhou,Shuang Li,Yunxia Zhao
Si 3 N 4 ceramics with high thermal conductivity and outstanding mechanical properties were prepared by adding β-Si 3 N 4 seeds and nanophase α-Si 3 N 4 powders as modifiers. The introduction of β-Si 3 N 4 seeds enhanced the growth of β-Si 3 N 4 grains. Owing to the interlocked structure induced by the β-Si 3 N 4 grains, the fracture toughness of Si 3 N 4 ceramics reached a high value of 7.6 MPa·m 1/2 ; also, the large-sized grains increased the contact possibility of Si 3 N 4 grains, improving the thermal conductivity of Si 3 N 4 ceramics (64 W/(m·K)). Because of the introduction of nanophase α-Si 3 N 4 , the flexural strength, fracture toughness, and thermal conductivity of the Si 3 N 4 ceramics increased to 754 MPa, 7.2 MPa·m 1/2 , and 54 W/(m·K), respectively. According to the analysis of the growth kinetics of Si 3 N 4 grains, the rapid growth of Si 3 N 4 grains was ascribed to the reduction in the activation energy resulting from the introduction of β-Si 3 N 4 seeds and nanophase α-Si 3 N 4 .
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2019
·
IF 5.189
Jingfu Jia,Xiaojing Liu,Kongyun Wu,Xue Zhou,Fahuan Ge
Nanocarriers of the stimuli-responsive mesoporous silica nanoparticles (MSNs) have exhibited great potential on target-specific and controlled-release drug delivery. However, it is still a challenge to load drugs into this promising nanocarriers because of its gated structure. In this study, we developed a method named gate-penetration by supercritical CO 2 (GPS) to successfully prepared zedoary oil loaded chitosan grafted MSNs (ZO@CS-MSNs). Quantitative analysis by high performance liquid chromatography demonstrated the composition ratio of six primary ingredients in zedoary oil remained constant after the drug loading process. Several process parameters of GPS were optimized, and the drug load of ZO reached 41.4 ± 1.2%. Morphology characterization by scanning electron microscope showed that ZO@CS-MSNs were spheres with diameter about 80 nm and a ‘gate’ structure was formed by chitosan on the surface of MSNs. Infrared and thermogravimetric analysis were performed to further confirm the structure of ZO@CS-MSNs. in vitro drug release test under different pH conditions indicated that ZO had a well pH-response release behavior, proving that ZO was transported into the inner channels of MSNs. The results state GPS is a promising way of high-efficacy and non-destructive to overcome the drug loading problems for stimuli-responsive MSN and further extend its application.
研究领域:
药剂学
·
纳米医学
·
材料科学
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产品关联
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 4
·512
·
IF 2.67
Zhijian Wang,Feng Pan,Lanlan Liu,Qifeng Du,Ruitao Tang,Jun Ai,Hong Zhang,Ying Chen
Mg2SiO4holds promise for its application in the microwave communication field due to its low dielectric constant and highQ×fvalue. However, its high negativeτfand high sintering temperature limit its application in low-temperature co-fired ceramic (LTCC) devices. In this work, Li2TiO3and CaTiO3were introduced to improve theτf, and LiF was chosen to decrease the sintering temperature. According to XRD patterns and SEM micrographs, the ceramic systems displayed a complex-phase structure, and the microstructure was densified when CaTiO3was added. All of the relative densities, dielectric constants, andQ×fvalues first increased and then decreased as the sintering temperature increased. The MLLC11.5 ceramics sintered at 800 °C could be obtained with the highestQ×fvalue of 54,581 GHz (at 8.06 GHz),εrof 14.13, andτfof + 5.81 ppm/°C. Furthermore, it was proven that the MLLC11.5 powders could be co-fired without any reaction with Ag powders at 800 °C, indicating its potential for LTCC application. The MLLC11.5 composition was used to prepare a GPS antenna and showed good prospects for its application in electronic communications.Keywords:Mg2SiO4-Li2TiO3-LiF-CaTiO3ceramics;structure;microwave dielectric property;LTCC;antenna
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF GERIATRIC PSYCHIATRY
·
2024
·Vol. 39
·期 7
·e6119
·
IF 3.6
James Watson,Kerry Hanna,Catherine Talbot,Marcus Hansen,Jacqueline Cannon,Thais Caprioli,Mark Gabbay,Aravind Komuravelli,Ruth Eley,Hilary Tetlow,Clarissa Giebel
Objectives For many people with dementia and unpaid carers, using technology for care and support has become essential. Rapid proliferation of technology highlights the need to understand digital access to health and social care services for dementia. This mixed-methods systematic review aims to explore digital access to health and social care services for dementia, from the perspective of people with dementia and unpaid carers. Methods Nine electronic databases were searched in May 2023 for qualitative, quantitative, or mixed-method studies, published in English or German, focused on experiences of using technology-delivered health and social care services for people with dementia and unpaid carers. After removal of duplicates and screening, 44 empirical papers were included. Results From the 44 studies, findings were grouped into five categories, highlighting experiences for people with dementia and unpaid carers: (1) Adapting to technology, (2) Inequalities and variations in outcomes, (3) Impact on caring, (4) Impact on health, and (5) Impact on relationships. Proliferation of technology in care access emphasised the need for quick adaptation to technology and examination of its impact. The impact of such service delivery has evidenced mixed findings. There were improvements in the health and wellbeing of people with dementia and unpaid carers, and benefits for their dyadic relationship. However, using technology for health and social care access is not always possible and is often reliant on unpaid carers for support. Lower tech-literacy, lack of equipment or money to buy equipment and poor internet connection can impact the potential for positive outcomes. Conclusions Technology can bring great benefits: social inclusion, improved service access and care. However, using technology in service delivery in dementia needs careful thought. Professionals and service providers need to be cognizant of the complex nature of dementia, and the benefits and challenges of hybrid service delivery.
研究领域:
老年学
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数字健康
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卫生服务研究
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神经退行性疾病
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患者与照护者体验
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DOI
高影响因子
Green Processing and Synthesis
·
2019
·Vol. 8
·期 1
·568-576
·
IF 1.128
Yingna Cui,Changping Li,Ming Bao
Deep eutectic solvents (DESs) are successfully used as powerful and recyclable catalysts and solvents for the synthesis of 3,4-dihydropyrimidin-2(1 H )-ones/thiones (DHPMs). The acidity of DESs is the main factor that determines catalytic activity. DESs, based on p -toluene sulfonic acid (PTSA) and choline chloride (ChCl), exhibits the highest catalytic activity. ChCl/2PTSA is suitable for a vast variety of aromatic aldehydes with electron-donating and electron-withdrawing groups, different β-diketonates, and urea or thiourea to obtain the corresponding DHPMs. Furthermore, DESs can be recycled easily after synthesis. The reused DESs achieve catalytic efficiency six times without significant changes. This study will provide a new green catalyst and efficient process for the synthesis of DHPMs.
研究领域:
有机化学
·
绿色化学
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DOI
高影响因子
Green Processing and Synthesis
·
2017
·Vol. 7
·期 3
·191-197
·
IF 0.782
Wenxiu Deng,Lujie Liu,Yanqing Peng
A new biocompatible amino-functionalized ionic liquid composed solely of biomaterials was synthesized from taurine and choline hydroxide, and its physical properties (density, viscosity, miscibility and thermal stability) were also determined. The classic base-promoted three-component cyclic condensation of aromatic aldehydes, malononitrile and dimedone was chosen as the test reaction to demonstrate the catalytic activity of choline taurinate ([Ch][Tau]). The catalyst could be recovered and reused several times with no significant loss of activity. As a basic ionic liquid, [Ch][Tau] can extract acidic compounds from immiscible solvents through acid-base interaction. The extraction process of fluorescent dye Rhodamine B was monitored using ultraviolet-visible (UV-Vis) spectroscopy, by which the percentage extraction rate was determined as 95%.
研究领域:
有机化学
·
生物化学
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DOI
高影响因子
Green Processing and Synthesis
·
2022
·Vol. 11
·期 1
·823-829
·
IF 3.97
Bo Jiang,Yue-Yue Du,Guo-Zhi Han
Herein, we report a new one-step direct synthesis of aromatic azo compounds from anilines under mild conditions. With the catalysis of copper acetate mediated by palladium salt, rapid conversion of anilines to aromatic azo compounds can be observed under the conditions of base-free along with solvent-free. Furthermore, the cross-coupling nitridation reaction based on this strategy was also studied. This research provides not only a new way for the synthesis of symmetrical and asymmetrical aromatic azo compounds but also a strategy and platform for exploring catalytic applications of transition metal compounds.
研究领域:
有机化学
·
催化化学
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DOI
高影响因子
Green Processing and Synthesis
·
2022
·Vol. 11
·期 1
·595-603
·
IF 3.97
Fuhua Wei,Ting Zheng,Qinhui Ren,Hongliang Chen,Junhao Peng,Yufu Ma,Zhengjun Liu,Zhao Liang,Ding Chen
Metal–organic frameworks (Sm-MOFs) were prepared using a microwave-assisted ball milling method with a water solution. The structure was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and SEM, and the thermal stability of the Sm-MOFs was tested by Thermogravimetry (TGA). The results showed that the Sm-MOF material exhibited a favorable effect on removing the organic dye Congo red (CR). When the concentration of CR was 80 ppm, adding 50 mg of Sm-MOF material achieved an adsorption capacity of 396.8 mg·g −1 . The experimental data were analyzed theoretically through dynamics, and the experimental results were consistent with the second dynamics model, with correlation coefficients ( R
2 ) all above 0.99. Comprehensive data analysis revealed that the Sm-MOF materials had great potential for future application in wastewater treatment.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Green Processing and Synthesis
·
2021
·Vol. 10
·期 1
·336-348
·
IF 2.83
Yuxuan Ma,Yuan Xu,Hui Chen,Jifeng Guo,Xiao Wei,Lihui Huang
The imprinted polymers were prepared to absorb dichlorophen (DCP) by using mesoporous silica with ordered pores and high specific surface area. Both scanning electron microscopy and transmission electron microscopy results suggested that the mesoporous silica nanosphere pores had a periodic distribution. The imprinted layer of polymers was thin and uniform. The adsorption experiments showed that the adsorption of imprinted polymers was obviously improved due to the presence of mesoporous structure. The maximum adsorption capacity of MSNs@MIPs at 318 K was 91.1 mg/g, and the adsorption process rapidly reached the equilibrium within 40 min. The adsorption isotherm was well fitted by the Freundlich isotherm model, indicating that multimolecular layer adsorption mechanism governs the adsorption of DCP by the polymers. The adsorption of MSNs@MIPs complied with pseudo-second-order kinetic model. Both selective and regenerative experiments demonstrated that MSNs@MIPs can be successfully applied for selective adsorption of DCP.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Green Processing and Synthesis
·
2022
·Vol. 11
·期 1
·536-544
·
IF 3.97
Ba-Duc Tran,Phuong-Nam Tran,Xuan-Thanh Bui,Duy-Hung Nguyen,Thanh-Tung Duong
In this study, CsPb 1– x
Mn
x
Br 3–2 x
Cl 2 x
( x = 0–0.5) nanoparticles were synthesized directly in toluene solvents at high temperature. This approach results in small-size nanoparticles, which can be used in photoelectric components without adding a filtration process to eliminate high-temperature solvents such as octadecene. The high content Mn 2+ -incorporated CsPb(Cl/Br) 3 host is observed by strongly wideband emission at 592 nm of manganese d-states spin and orbital forbidden transition. After infiltration into mesoporous TiO 2 , the Mn 2+ ion receives energy from the CsPb(Cl/Br) 3 host (irradiated 405 nm light-emitting diode source) and effectively transfers to the TiO 2 scaffold layer. As a result, a metal/semiconductor/metal planar structure photodetector with m-TiO 2 /CsPb 1– x
Mn
x
Br 3–2 x
Cl 2 x
( x = 0–0.5) composite showed several figures of merit compared to bare m-TiO 2 and m-TiO 2 /CsPbBr 3 such as on/off ratio of 10 4 times, responsivity of 1.67 A·W −1 , and detectivity of 4.42 × 10 9 Jones. The key factors contributing to the growth of the on/off ratio include the decreasing dark current and enhancing exciton energy and transportation due to the infiltration of CsPb 1– x
Mn
x
Br 3–2 x
Cl 2 x
( x = 0–0.5) perovskite quantum dots into mesopores of the m-TiO 2 scaffold layer.
研究领域:
材料科学
·
纳米技术
·
光子学
·
半导体器件
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DOI
高影响因子
Green Processing and Synthesis
·
2021
·Vol. 10
·期 1
·219-229
·
IF 2.83
Yiming Xu,Suli Liu,Weijun Meng,Hua Yuan,Weibao Ma,Xiangqian Sun,Jianhong Xu,Bin Tan,Ping Li
Heavy alkyl benzene sulfonates are inexpensive surfactants that are extensively used as oil-displacing agents during tertiary oil recovery. Among these, C 16–18 heavy alkyl benzene sulfonates possess an excellent ability to reduce the oil-water interface tension. In this study, hexadecylbenzene sulfonic acid (HBSA) was synthesised in a continuous stirred-tank microreactor using a continuous method with 1,2-dichloroethane (EDC) dilution. Post-sulfonation liquid SO 3 solution was used as a sulfonating agent for hexadecylbenzene (HDB). The effects of reaction conditions, such as the SO 3 :HDB molar ratio, sulfonation temperature and sulfonation agent concentration, on the yield and purity of the product were investigated. Optimisation of the reaction process yielded high-quality HBSA samples with a purity exceeding 99 wt%. The continuous sulfonation process significantly enhanced the production and efficiency in the case of a considerably short residence time (10 s) in the reactor, without the need for aging. The results of this study demonstrate significant potential for application in industrial production.
研究领域:
化学工程
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表面活性剂化学
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石油工程
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DOI
高影响因子
Green Processing and Synthesis
·
2024
·Vol. 13
·期 1
·
IF 3.8
Xiaofei Zhen,Han Zhan,Ruonan Jiao,Ke Li,Wenbing Wu,Lei Feng,Tie Du
Medium-temperature anaerobic digestion experiments lasting for 55 days were conducted using sulfamethoxazole (SMX)-containing chicken manure in sequential batch reactors added with nano-Fe 2 O 3 at a concentration of 300 mg·kg −1 ·TS or nano-C 60 at a concentration of 100 mg·kg −1 ·TS. The effects of nanoparticles on the anaerobic digestion properties of SMX-containing chicken manure were assessed by measuring the following indicators: biogas production by anaerobic digestion, chemical parameters, enzyme concentrations, and bacterial diversity and changes in antibiotic concentrations over time. The law of bacterial degradation of SMX was analyzed. The results showed that (1) adding either nano-Fe 2 O 3 or nano-C 60 promoted biogas production by anaerobic production from chicken manure containing different concentrations of SMX, and the cumulative biogas production in Fe 2 O 3 and nano-C 60 increased by 35.4% and 130.7%, respectively. The final cumulative biogas productions in different groups were as follows: 3,712(CK), 4,281(S1), 3,968(S2), 4,061(S3), 4,498(S4), and 4,639(S5) mL and the final concentration of SMX residues varied between 99.79% and 99.94%; (2) Bacterial abundance at the phylum level: on day 1, Firmicutes and Bacteroidota were the main dominant bacterial phyla, with relative abundances of 45.13–68.53% and 26.12–48.32%, respectively. The addition of nanoparticles increased the abundance of Bacteroidota in S4 and S5 significantly. The abundance of Bacteroidota was slightly higher in the group added with nanoparticles than in S2. On day 50, Firmicutes became the dominant bacterial phylum, and its relative abundance varied little across the groups, ranging from 90.87% to 94.54%; (3) At different stages, the bacterial community structure at the genus level was dramatically affected by substrates. As nutrients were being depleted, some bacterial communities lost their original competitive advantages. On day 5, the relative abundance of Prevotella increased. Especially, the relative abundances of Prevotella in S4 and S5 added with nanoparticles were lower than that in S2 by 8–10%. On day 15, the relative abundance of Prevotella in S2 decreased compared with the control group CK. A decrease was also observed in S4 and S5, although to a smaller extent than in S2.
研究领域:
环境科学
·
微生物学
·
生物技术
·
废物管理
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DOI
高影响因子
危险品化学品经营许可证（带存储）