JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 1
·1-11
·
IF 2.009
You Xiao,Feng Qian,Yang Jinshan,Huang Kai,Hu Jianbao,Dong Shaoming
Exploring the graphene material is premised on the graphene sheets being single-layer graphene (SG) or bi-layer graphene (BG) state, and graphene suspension keeps stably disperse are critical. Since graphene has a highly conjugated system, it is easy to conduct strong π-π interaction with conjugated structure. In this paper, by dispersing graphene powder at low boiling point solvent water or ethanol, ensuring the excellent properties of graphene are not affected by the solvent, which simultaneously solves the difficulty of removing organic solvents. On the basis the concentration of graphene suspension can be greatly improved and no damage to the graphene sheets in the presence of dispersant. This method allows us to prepare a large amount of excellent graphene dispersion, making it possible to obtain graphene-based materials through the low-cost technology, as well as opening up the opportunity for exploiting the application of this nanocarbon material with unique structure.
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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 Water Process Engineering
·
2023
·
IF 7
Ce Wang,Yuling Lü,Chao Song,Jiakai Shi,Peng Zhang,Limin He
The poor adhesion of oil droplets and bubbles in the flotation process leads to inefficient separation of oil and water. In this paper, condensate bubbles were prepared by partial vaporization of low boiling point condensate to increase the oil removal effect. The purpose of partial vaporization was achieved by bringing emulsified condensate droplets into the produced water at different temperatures. The structure of the bubble is composed of condensate film wrapped around the gas core of the vaporized portion. The contact angle between condensate bubble and oil surface is >150°, which show great similarity-intermiscibility. The average bubble size prepared at 303 K - 318 K is 20 - 100 μm. The stability of bubbles decreased with an increase in temperature, the half-decay time decreased from 340 s to 110 s, and the zeta potential decreased from −31 mV to −12 mV. However, the gas hold-up of the bubbles first increased and then decreased with the increase in temperature, while the highest gas holdup was 21 % at 313 K. The rise of the condensate/water ratio (R con-wat ) did not increase the stability of the bubbles, but the gas holdup increase. The condensate bubble flotation experiment found that at the optimum temperature 313 K, the oil removal efficiency of 1.5 % R con-wat can reach 85 %. In contrast, the oil removal efficiency of the dissolved air flotation experiment is <75 %. Otherwise, with a smaller amount of flocculant (ferric chloride), the oil removal efficiency of condensate bubble flotation can reach >95 %.
研究领域:
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Tao Zhang,Ao Li,Xin Xu,Yixin Ma,Dongmei Xu,Lianzheng Zhang,Jun Gao,Yinglong Wang
Acetone and n -heptane are widely applied in pharmaceutical industry as benign solvents and are observed in the wastewater. Because acetone and n -hexane can form an azeotropic mixture, it is impossible to recover acetone and n -heptane with high purity from the wastewater using conventional distillation. In this research, for separating the azeotrope (acetone + n -heptane) by homogeneous extractive distillation, 1-chlorobutane and butyl propanoate were chosen as the intermediate and heavy boiling entrainers. The isobaric vapour-liquid equilibrium (VLE) behaviour for the three binary systems (acetone + 1-chlorobutane), (butyl propanoate + acetone) and ( n -heptane + butyl propanoate) were reported at 101.3 kPa. The values of the excess Gibbs energy ( G E ) were calculated to explore the nonideal of the systems. The thermodynamic consistency of the determined VLE values was checked by the van Ness and Herington tests. In addition, the determined VLE data were fitted by the UNIQUAC, Wilson, and NRTL models. The parameters of those models were regressed, which are helpful for simulating the separation process with the intermediate and heavy boiling entrainers by extractive distillation.
研究领域:
化学工程
·
热力学
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分离过程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER JOURNAL
·
2015
·Vol. 48
·期 2
·169-175
·
IF 1.653
Wu Qi,Pan Lili,Wang Haijiang,Deng Wenxiu,Yang Guangjie,Liu Xikui
Polymeric aerogels have great potential in numerous fields because of their unique combination of thermal and electrical properties, and lightweight porous structures. However, the laborious supercritical CO 2 drying method required for making these aerogels limits their commercial availability. Here we demonstrate a green and scalable method for preparing high-performance polyimide (PI) aerogels using a low-boiling-point solvent mixture of tetrahydrofuran/methanol, and especially using sublimation drying instead of laborious supercritical CO 2 drying. The monolithic and powder polyamic acid aerogels can be prepared easily; after thermal imidization, PI aerogels with nanofibrous morphology, low density and high thermal stability can be obtained. This green, scalable and cost-effective process will facilitate the application of high-performance PI aerogel materials in many fields, in particular those in which high-temperature resistance is important.
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
Research
·
2023
·
IF 11
Siyang Li,Panpan Zhu,Yaoting Xue,Lei Wang,Tuck-Whye Wong,Xuxu Yang,Haofei Zhou,Tiefeng Li,Wei Yang
Heterogeneous nucleation plays a critical role in the phase transition of water, which can cause damage in various systems. Here, we report that heterogeneous nucleation can be inhibited by utilizing hydrogel coatings to isolate solid surfaces and water. Hydrogels, which contain over 90% water when fully swelled, exhibit a high degree of similarity to water. Due to this similarity, there is a great energy barrier for heterogeneous nucleation along the water–hydrogel interface. Additionally, hydrogel coatings, which possess polymer networks, exhibit higher fracture energy and more robust adhesion to solid surfaces compared to water. This high fracture and adhesion energy acts as a deterrent for fracture nucleation within the hydrogel or along the hydrogel–solid interface. With a hydrogel layer approximately 100 μm thick, the boiling temperature of water under atmospheric pressure can be raised from 100 to 108 °C. Notably, hydrogel coatings also result in remarkable reductions in cavitation pressure on multiple solid surfaces. We have demonstrated the efficacy of hydrogel coatings in preventing damages resulting from acceleration-induced cavitation. Hydrogel coatings have the potential to alter the energy landscape of heterogeneous nucleation on the water–solid interface, making them an exciting avenue for innovation in heat transfer and fluidic systems.
研究领域:
材料科学
·
热力学
·
流体力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2024
·
IF 1.5
Zhang Chenxia,Wu Zeyi,Qiu Meiyan,Li Yanhua,Wang Zhongqing,Fan Xiaomei,Cai Shaoyu,Rao Wanbing
The difficulty on determination of high boiling point solvents, always exist due to their low vapor pressure in headspace (HS) vial. What’s worse, the commonly used GC diluents, such as N, N-dimethylacetamide, 1,3-dimethyl-2-imidazolidinone, dimethyl sulfoxide, N, N-dimethylformamide and N-methylpyrrolidone are often remained in HS instrument after frequent injection into HS, thus would result in terrible positive interference problem. In this work, a fast and sensitive HPLC method in combination with a sample precipitation method, was proposed for the determination of above five high boiling point solvents in drug substances within 14.5 min. The final method was validated with regard to limit of detection and limit of quantitation, precision, linearity and accuracy in accordance with ICH Q2 (R1). Finally, the proposed strategy was successfully applied for the analysis of high boiling point solvents used in three active pharmaceutical ingredients. The established generic strategy would provide another choice for the determination of high boiling point solvents in pharmaceuticals.
研究领域:
分析化学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Junsheng Hou,Dongyu Li,Xiong Zhao,Li Ma,Lei Huang,Yinan Qiu,Junjie Wu,Zihan Ding,Jiabin Fang,Jinjia Wei,Nanjing Hao
Enhanced boiling heat transfer through nanofluids represents a significant approach to improving the cooling performance of electronic devices. However, the preparation of nanofluids poses challenges regarding production efficiency, morphology control, and structural stability. In addition, the underlying mechanism of flow boiling heat transfer enhancement of nanofluids, particularly changes in vapor behavior, remains a limited understanding. This study presents a facile and straightforward microfluidic strategy for the controllable synthesis of nanofluids toward efficient heat transfer enhancement. The microfluidic flow synthesis approach effectively enhances mixing efficiency at various flow rates, enabling continuous and high-throughput synthesis of boehmite nanofluids with different morphologies. The synthesized nanofluids exhibit long-term stability (>50 days) at room temperature. Both rod- and sphere-shaped nanofluids under equivalent concentrations can significantly improve critical heat flux (CHF) and maximum heat transfer coefficient (HTC) across various operating parameters, but with similar enhancement characteristics. Analysis of the period of bubble growth and burst, bubble size distributions, number of bubbles, and vapor phase fractions reveals that rod- and sphere-shaped nanofluids could shorten the period, enhance surface wetting, increase nucleation sites, and reduce bubble size efficiently and similarly. Furthermore, the effect of the concentration of nanofluid on phase-change heat transfer performance is systematically explored. 0.01 wt% nanofluid behaves the most remarkable enhancement, CHF and maximum HTC are improved by 24 % and 14.4 %, respectively. These findings not only shed new light on the controllable synthesis of functional nanomaterials but also provide important guidelines for the rational design of nanofluids for efficient two-phase cooling of electronic devices.
研究领域:
材料科学
·
热能工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Guocai Wang,Shigui Tang,Fei Cao,Hongli Wu,Honghua Jia,Ping Wei,Pingkai Ouyang
During the lactide producing process, volatile impurities, such as lactic acid and its dimer, are simultaneously distilled out with lactide. To remove these impurities, many post-treatments were needed. Herein, we present a novel approach to obtain high purity lactide by adding high-boiling-point alcohols to immobilize these volatile impurities. A series of high-boiling-point alcohols were screened and pentaerythritol was found to be the best immobilization reagent. When the molar ratio of lactic acid’s carboxylic group and pentaerythritol’s hydroxyl group was 15:1, lactide with 99% GC purity was directly distilled out and no traces of lactic acid and its dimer were detected. The results of HPLC-MS revealed that the distillation residues were esters of pentaerythritol with lactic acid or its oligomer. This indicated that volatile impurities were immobilized in distillation residues. The distillation residues were reused for 4 runs, and the purities of lactide were all over 98%.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Zhenkang Li,Zhiping Wang,Qiwei Yang,Zhiguo Zhang,Yiwen Yang,Qilong Ren,Huabin Xing
Ionic liquid (IL)-mediated extraction methods have drawn much attention due to their reduced environmental impact and improved extraction efficiencies compared to traditional separation methods. However, one long-standing challenge in the application of IL-based extraction processes is the difficulty in recovering high-boiling solutes from the IL phase due to the negligible vapor pressure of ILs and the strong interaction between solutes and ILs. In this study, a new CO2-assisted back-extraction method was developed for the recovery of high-boiling solutes from the IL phase based on the reversible chemical absorption and/or strong physical interaction of CO2 with ILs. We found the distribution coefficient (D) of the typical solute δ-tocopherol in the [P4444][Pro]/DMSO–hexane biphasic system significantly decreased from 10.38 to 2.42 after the introduction of CO2, which greatly reduced the required solvent consumption and the number of back-extractions required for tocopherol recovery. For example, the number of back-extractions required for the recovery of 90% of the tocopherols from the [P4444][Pro]/DMSO–hexane biphasic phase decreased from 24 to 5 with the aid of CO2 absorption, along with a decrease in solvent consumption by approximately 80%. The effects of the structure of the IL, the loading of CO2, the type of cosolvents, and the temperature of the CO2-assisted back-extraction processes were investigated in this study. This proof-of-concept study demonstrates the great potential of CO2-assisted back-extraction as a green method for the efficient recovery of high-boiling solutes from the IL phase.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Hongru Zhang,Bingjie Huo,Mengya Sun,Rongli Shan,Peizhe Cui,Jingwei Yang,Yinglong Wang,Shiqing Zheng
For the extraction distillation process, the choice of entrainer is very important. Usually, the boiling point of the entrainer is higher than that of any of the components to be separated, while the mechanism of separation of azeotropic system with intermediate-boiling-point solvent as entrainer is not common. Taking the azeotrope of n-heptane and isopentyl alcohol as an example, the intermediate-boiling-point solvent of butyl acetate was determined as the entrainer. The experimental data of vapor–liquid equilibrium for the two systems of n-heptane isoamyl alcohol and n-heptane butyl acetate were analyzed. After the thermodynamic consistency test, the binary interaction parameters of three models were obtained by correlating and regressing the experimental data. The possibility and mechanism of the extraction of azeotropic system by the intermediate-boiling-point solvent were analyzed from the aspects of σ-profile, interaction energy and charge density by the principle of quantum chemistry and molecular dynamics. The results showed that the tendency of hydrogen bond between the intermediate-boiling-point solvent and the azeotropic system was different: one component interacted with each other in the form of hydrogen bond, and the other had no hydrogen bond. The mechanism of the intermediate-boiling-point solvent as the entrainer to separate azeotropic system was verified in the extractive distillation process.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2025
·
IF 4.1
Jiangchen Wu,Qiang Li,Xinghua Liu,Jingxia Zheng,Lin Chen,Yongzhen Yang,Chunhui Su
A simple and rapid one-step microwave-assisted method was employed to synthesize solid-state red emissive carbon dots (R-CDs) using phloroglucinol, urea, and ammonium fluoride in a high-boiling point solvent. Raw material ratios and solvent types were investigated. The optimal emission of R-CDs at 625 nm was achieved when the molar ratio was 3:1:6 in a 50% N , N -dimethyl formamide/water for 15 min. When formamide and water (v/v = 5:95) were used, R-CDs with longer emission (640 nm) were obtained and the reaction time was shortened to 3 min, enhancing both efficiency and cost-effectiveness. Both R-CDs maintained >96% fluorescence intensity after UV exposure and <5% weight loss at 200°C. Combined with polyvinyl pyrrolidone, R-CDs baesed red LEDs with CIE coordinates (0.67, 0.33) and (0.62, 0.38) were achieved. Combined with blue/green CDs, white LEDs showed color rendering indexes of 91–92. This study advances solid-state red CDs for high-quality white LEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Dan Li,Ying Zhao,Yunxiao Zhang,Jinliang An,Jiaqiang Huang,Jinglei Yang
The facile encapsulation of perfluoro liquids that are hydrophobic but not lipophilic into liposomes or microcapsules presents a significant challenge in the fields of biomedicine, dynamic optics, functional chemical applications, etc. This is due to their chemical inertness and physical immiscibility, particularly those with low boiling points. In this study, a novel strategy based on a double emulsion template via solvent evaporation is proposed after investigating the mechanism of three-phase emulsion systems. The perfluoro liquid droplets can be easily emulsified into a polymer solution as the second emulsion layer, where the polymer shell is formed during solvent evaporation in the continuum medium under proper processing controls. The morphology of particles is predictable and fits well with the linear model derived from Neumann’s triangle in three-phase systems. Furthermore, a comprehensive study on the encapsulation of perfluoro ketone, which is widely used as a green fire extinguisher agent, is conducted as an example. The encapsulated perfluoro ketone showed instant thermal response upon heating while maintaining a good shelf life at room temperature. The remarkable fire suppression performance exhibited great potential for practical applications. This work offers more insight into the encapsulation of “naughty” perfluorinated chemicals and provides more possibilities for extended applications.
研究领域:
生物医学
·
动态光学
·
功能化学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）