JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2012
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IF 1.693
Xiao-Ming Peng,Yu-Feng Hu,Jin-Zhu Zhang,Zhi-Xin Wang,Zhe-Yu Li,Chao Miao
Viscosities were measured for the ternary systems Y(NO3)3 + Ce(NO3)3 + H2O, Y(NO3)3 + Nd(NO3)3 + H2O, and Ce(NO3)3 + Nd(NO3)3 + H2O and their binary subsystems Y(NO3)3 + H2O, Ce(NO3)3 + H2O, and Nd(NO3)3 + H2O at (293.15, 298.15, and 308.15) K and atmospheric pressure. The results were used to test the applicability of simple equations for the viscosity of mixed solutions. The predictions agree well with measured values, implying that the viscosities of the examined electrolyte solutions can be related to those of their constituent binary solutions using these simple equations.
研究领域:
化学
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物理化学
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DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 7
·985
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IF 2.67
Yuhan Feng,Yumin Zhang,Jipeng Liu,Ye Zhang,Yongshuai Xie
Due to its high thermal and chemical stability, excellent dielectric properties, unique optical properties, corrosion resistance, and oxidation resistance, the two-dimensional hexagonal boron nitride (h-BN) is often used in a thermal conductor protective layer in deep ultraviolet light-emitting detector fields. However, due to the complicated growth conditions of h-BN, it is often necessary to prepare h-BN by the CVD method in a high vacuum environment, which is limited to a certain extent in terms of film size and production cost. In order to solve this problem, we proposed a method to prepare h-BN thin films by atmospheric CVD (APCVD). This method does not need a vacuum environment, which reduces energy consumption and cost, and makes the operation simpler and the experimental environment safer. The preparation of high-quality h-BN film was carried out using a Cu-Ni alloy as the growth substrate. The growth process of h-BN film was studied, and the influence of growth parameters on the structure of the h-BN film was explored. The morphological features and elemental composition pairs of the samples were characterized and analyzed, which confirmed that the high-quality h-BN film could be successfully grown on the Cu-Ni alloy substrate by APCVD. The UV detection device prepared by using the prepared h-BN film as the photoresponse material had good photoresponse characteristics and performance stability. It provides a new idea for the low-cost preparation of large-scale h-BN.Keywords:APCVD;h-BN;film;photoelectric devices
研究领域:
材料科学
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物理学
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DOI
高影响因子
Greenhouse Gases-Science and Technology
·
2023
·Vol. 13
·期 5
·689-698
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IF 2.2
Xuewei Tu,Luping Zhang,Yutong Chen,Shouxin Zhu,Can Sun,Jiali Jin,Min Liu,Hui Zheng
The conversion of CO 2 into valuable chemicals to reduce greenhouse gas emissions has received extensive attention. Converting CO 2 into pharmaceutical intermediates via graphitic carbon nitride (CN) at atmospheric pressure is a challenge. In this work, a series of novel graphitic carbon nitrides (K-CN) catalysts with different doping ratios of K were synthesized by post-treatment of CN with KOH as a dopant under magnetic stirring. Herein, substrates of o -phenylenediamine with different electron-donating/withdrawing groups were employed to convert CO 2 into high-value heterocyclic benzimidazoles. The optimal reaction conditions were determined by a single factor optimization approach. A series of benzimidazole derivatives were synthesized with a yield of up to 96% under atmospheric pressure, indicating that the catalyst can efficiently fix CO 2 . This work not only designs a simple and low-cost K-CN catalyst but also provides a new pathway for converting CO 2 into valuable benzimidazole derivatives at atmospheric pressure. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
催化化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zihao Song,Wenqi Liu,Longjin Huang,Man Yuan,Sisi Shang,Wei Liu,Sheng Cui
The high production cost and extremely weak mechanical properties of SiO 2 aerogels have been two major challenges hindering its widespread application. Atmospheric pressure drying (APD) has always been regarded as the optimal process to reduce costs. However, traditional APD is cumbersome, still uses a large amount of expensive raw materials, and is extremely immature. In this study, a novel APD was developed, inspired by the wing changes during adult damselfly process. Inorganic silica source/water was used as the raw material, and CO 2 was used instead of low surface tension solvent to stabilize the aerogel skeleton structure in situ, and ultimately aerogel material was obtained. The thermal conductivity of pure aerogels was as low as 0.0264 W/(m·K), the porosity reached 94.7 %, and the preparation cycle was only 28.5 h. The thermal stability of the skeleton structure and the chemical stability of surface were investigated and showed the hydrophobicity to withstand temperatures up to 400 °C. Aerogel composites feature low thermal conductivity of 0.0283 W/(m·K), and prominent thermal insulation properties over a wide temperature range of 50–300 °C. For traditional APD, this method shortens preparation cycle by 1–6 times. Compared with the commercial aerogel, the cost is reduced by 38.2 %, and the process is simple and environmentally friendly under the premise of ensuring excellent performance.
研究领域:
材料科学
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仿生学
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 4
·460
·
IF 2.935
Jing Yang,Yi Pu,Dagang Miao,Xin Ning
The surface treatment of fabrics in an atmospheric environment may pave the way for commercially viable plasma modifications of fibrous matters. In this paper, we demonstrate a durably superhydrophobic cotton cellulose fabric prepared in a single-step graft polymerization of hexamethyldisiloxane (HMDSO) by N2and O2atmospheric pressure plasma. We systematically investigated effects on contact angle (CA) and surface morphology of the cotton fabric under three operational parameters: precursor value; ionization gas flow rate; and plasma cycle time. Surface morphology, element composition, chemical structure and hydrophobic properties of the treated fabric were characterized by scanning electron microscope (SEM), EDS, FTIR and CA on the fabrics. The results indicated that a layer of thin film and nano-particles were evenly deposited on the cotton fibers, and graft polymerization occurred between cellulose and HMDSO. The fabric treated by O2plasma exhibited a higher CA of 162° than that treated by N2plasma which was about 149°. Furthermore, the CA of treated fabrics decreased only 0°~10° after storing at the ambient conditions for four months, and treated fabrics could also endure the standard textile laundering procedure in AATCC 61-2006 with minimum change. Therefore, this single-step plasma treatment method is shown to be a novel and environment-friendly way to make durable and superhydrophobic cotton fabrics.Keywords:atmospheric pressure plasma;durability;superhydrophobility;cotton fabric;siloxane
研究领域:
材料科学
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纺织工程
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表面化学
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产品关联
DOI
PubMed
高影响因子
Chemical Engineering and Processing-Process Intensification
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2015
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IF 2.071
Fengping Peng,Yaru Ni,Qiang Zhou,Jiahui Kou,Chunhua Lu,Zhongzi Xu
This work reported a universal and effective route to fabricate a kind of flexible photocatalyst film to broaden the scope of application (wearable photocatalyst devices for example). This technology roadmap is premised on the air atmospheric pressure glow discharge (AAPGD) pretreatment. Through treating poly (dimethyl siloxane) (PDMS) with AAPGD technique, the PDMS surface is functionalized by hydroxyl groups and the contact angle gains a minimum value of about 26.0, which make it easy to be decorated for the desired efficiency. Then the PDMS surface can be endowed with photocatalytic activity through wet-chemical method without the bondage of inherent hydrophobic-nature. Owing to the hydrophilic surface, the graphene can be inserted to improve the photocatalytic performance and the flexibility of graphene was kept. Compared with the photocatalysts films without AAPGD pretreatment, the photocatalytic performance of films suffering from AAPGD pretreatment is much higher. Therefore this flexible film strategy, based on AAPGD pretreatment, is of great significance to design flexible photocatalysts films, pushing forward the development of wearable photocatalyst devices.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SOLID STATE SCIENCES
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2024
·
IF 3.4
Meng-Jie Chang,Xin Li,Jun Liu,Ge Bai,Qiu-Yu Hu
Water glass (WG)-based aerogels (WAGs) are challenged with requirement of acid catalyst and poor mechanical property. In this work, we have developed a novel formamide (FA) as catalyst for gelation of WG at alkaline condition to prepare WAG monolith under atmospheric pressure drying (APD). The FA serves both as the catalyst by hydrolyzing product formic acid and drying control agent. The effect of the gelation temperature, FA dosage, and WG concentration on the gelation time, density, shrinkage and microstructure of the aerogels were analyzed. The optimum WAG monolith shows a low shrinkage of 20 % and density of 0.165 g cm −3 , as well as large specific surface area of 229.4 m 2 g −1 and superhydrophobic surface. The connected nanoparticle into three-dimensional network endows the WAG monolith with good mechanical property. Due to the low-cost, easy fabrication process and free usage of acids, the method expands the synthesis of aerogel monolith.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ANALYST
·
2022
·Vol. 147
·期 21
·4857-4865
·
IF 5.227
Yiran Wang,Yuze Li,Xiao Wang,Dehua Yu,Zongxiu Nie
Hongmu, a Chinese customary noun representing 29 kinds of wood species such as some Pterocarpus species (abbreviated as spp. hereinafter), Dalbergia spp. and Diospyros spp., is popular among Chinese people due to the furniture made from it. The slow regeneration of hongmu resources led to a decline in production, making hongmu prices high and illegal businesses profit from it. Therefore, it is necessary to identify and distinguish different varieties of hongmu for commercial trade. Herein, a cost-effective and rapid methodology was first developed via atmospheric pressure glow discharge mass spectrometry (APGD-MS) to classify three Dalbergia spp. and three Pterocarpus spp. Meanwhile, principal component analysis (PCA) was further applied to distinguish wood species and six kinds of hongmu extracts were able to be approximately separated into six units. Besides, hongmu could be clearly distinguished from their counterfeits, such as Guibourtia spp., using the method provided here. This method may provide a timely and necessary way for the determination of ingredients and identification of the authenticity of hongmu.
研究领域:
木材科学
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分析化学
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植物分类学
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DOI
PubMed
高影响因子
Crystals
·
2019
·Vol. 9
·期 9
·474
·
IF 2.061
Xunan Shen,Chengchun Tang,Chao Zhang,Guanda Li,Yue Zhao,Wei Li,Guifeng Chen,Tie Yang
In current work, Cu2ZnSn(S,Se)4thin films have been prepared by the sol-gel method based on dimethyl sulfoxide solution followed by a modified three-step selenization process. The key process of this method is to divide the Se evaporation and annealing into two different stages: employ a thermal cracking Se source in the Se evaporation stage and an above-atmospheric pressure in the annealing process. The morphological, structural, elemental distributional, and photovoltaic properties of Cu2ZnSn(S,Se)4thin films prepared with the three-step selenization process were systematically investigated. It was found that through this modified selenization process, the formations of secondary phases (ZnSe, CuSnSe3) and a fine-grain bottom layer, which usually exists in the traditional one-step selenization process, were effectively suppressed. These improvements could further reduce the carrier recombination and improve the solar cell performance. The best solar cell is obtained with a short-circuit current density of 28.16 mA/cm2, open-circuit voltage of 404.91 mV, fill factor of 62.91%, and a power conversion efficiency of 7.17% under air mass 1.5 (100 mW/cm2) illumination.Keywords:CZTSSe solar cell;sol-gel method;selenization;thermal cracking Se;above-atmospheric pressure;secondary phases
研究领域:
材料科学
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光伏技术
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DOI
高影响因子
Reaction Chemistry & Engineering
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2022
·Vol. 7
·期 9
·1968-1977
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IF 5.2
Yu Chen,Chong Liu,Yaoting Duan,Dongkun Yu,Zhenghui Liu,Yuting Li,Ruifen Shi,Yuting Guo,Tiancheng Mu
Highly efficient and sustainable conversion of CO2 into quinazoline-2,4(1H,3H)-dione at room temperature and atmospheric pressure is challenging. Deep eutectic solvents (DESs) are considered as the green solvents of the 21st century, which are also designable with high tunability and high atom efficiency. Here, DESs are for the first time used to catalyze the CO2 conversion into quinazoline-2,4(1H,3H)-dione at room temperature and atmospheric pressure with high efficiency and nearly 100% yield. This work provides a sustainable way for the efficient conversion of CO2 into quinazoline-2,4(1H,3H)-dione by DESs at room temperature and atmospheric pressure.
研究领域:
化学
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环境科学
·
可持续发展
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产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 2
·226
·
IF 5.3
Shuo Wang,Simiao Li,Qian Zhao
Perovskite quantum dots (PQDs) have shown great promise in optoelectronic device applications. Typically, a traditional hot-injection method with heating and high vacuum pressure is used to synthesize these colloidal nanoparticles. In this article, we report a low-cost synthetic method for FAPbI3PQDs in air at atmospheric pressure with the assistance of ZnI2. Compared with the FAPbI3PQDs synthesized under vacuum/N2condition, the air-synthesized Zn:FAPbI3PQDs exhibit the same crystalline structure with a similar preferential crystallographic orientation but demonstrate higher colloidal stability and higher production yield. Furthermore, we examine the influence of ZnI2during the synthesis process on morphologies and optoelectronic properties. The results show that the mean size of the obtained FAPbI3PQDs is decreased by increasing the amount of added ZnI2. More importantly, introducing an optimal amount of ZnI2into the Pb source precursor enables increasing the carrier lifetime of FAPbI3PQDs, showing the potential beneficial effect on device performance.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL LETTERS
·
2023
·
IF 2
Shuowang Huang,Jiancheng Yu,Jun Li,Xu Tang,Yong Wu,Chenlu Wang,Haixing Wang,Keqi Tang
With the goal of enhancing the low sensitivity of the conventional atmospheric pressure chemical ionization (APCI) source due to the ion divergence, here is reported a T-shaped ion source to improve the sensitivity with a portable mass spectrometer for the rapid determination of the pesticides ethoprophos and atrazine in water. Compared with conventional APCI, the ion source improves the sensitivity for the analytes. The results show that the analysis requires less than 2 s, the limit of detection (LOD) is better than 0.1 μg·mL−1, and the relative standard deviation (RSD) is 16% at 1, 5, and 25 μg·mL−1. The recoveries of the analytes are between 80% and 130%, meeting the requirements for rapid pesticide determination in water.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）