CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Liming Liu,Yunlu Pan,Bharat Bhushan,Feiran Li,Xuezeng Zhao
Super-amphiphobic surfaces are limited either by the specific micro-morphologies which are difficult to fabricate on particular substrates, or by the liquid-repellent ability which is confined to liquids with surface tension (γ) higher than about 24 mN m −1 . To resolve this problem, a facile method was developed by introducing low surface energy building blocks to a surface for the purpose of realizing the combination between low surface energy and hierarchical structures with reentrant-like geometry. Magnetic nanoparticles with typical core-shell structure were synthesized through one-pot graft polymerization with amino silane and fluorosilane surfactant. By spraying or dip-coating method, a super-amphiphobic surface can be prepared on various substrates which can repel n-heptane (γ = 19.68 mN m −1 ) with sliding angle no more than 5°. The micro-morphology and chemical composition were optimized to achieve desired surface wettability. Thanks to the high super-amphiphobicity of the nanoparticles, the liquid marbles (LMs) with organic solvents have been obtained by using the core shell nanoparticles as the building blocks. The formed LMs can act as microdroplet carriers with the ability of repeatable tip opening-closing and magnetic-driven directed movements. Chromogenic reaction was realized in the LMs, which demonstrated the LMs can act as a desirable miniature reactor. Details of impact-resistance, motion stability, anti-corrosion properties and thermal stability for LMs have been investigated, which are of interest in applications of microfluidic system and microreactors.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2019
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IF 2.606
Liqing Chen,Atef Mohammed Qasem Ahmed,Yibin Deng,Dingyun Cao,Huanhuan Du,Jinghao Cui,Beom-Jin Lee,Qingri Cao
Low encapsulation efficiency (EE) and high initial burst release are key issues for the development of microspheres loading highly water-soluble peptide drugs. In this study, novel triptorelin acetate-loaded microspheres with high EE and low initial burst release were prepared by a liquid/oil/oil (L/O/O) phase separation method using poly(lactic- co -glycolic acid) (PLGA) as the sustained-release carrier. The formulation of the microspheres and the preparation process were optimized in terms of particle size, surface morphology, EE, and in vitro drug release. Importantly, PLGA concentration, solvent and non-solvent ratio, solidification solvent volume, and solidification speed were found to significantly affect the properties of the obtained microspheres. The optimal microspheres present 50–100 μm spherical-shaped particles with remarkably high drug loading and EE. The in vitro drug release of these microspheres exhibit a delayed-release manner, starting to release drug at the third week and displaying approximately 20% drug release at day 28. Fourier transform infrared spectroscopy and differential scanning calorimetry results show that triptorelin acetate slightly interacted with PLGA, indicating that the drug was successfully encapsulated into PLGA microspheres. The drug content in the microspheres had no significant change after the 12-month storage at 4 °C, suggesting their excellent long-term stability. In conclusion, novel triptorelin acetate-loaded PLGA microspheres have been achieved via the L/O/O phase separation method to effectively improve the EE and reduce the initial burst release.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Congfei Yao,Yucui Hou,Ying Sun,Weize Wu,Shuhang Ren,Hui Liu
The extraction of aromatics from aliphatics with both high distribution coefficient ( D ) and high selectivity ( S ) is a challenge in the industry. Hydrophobic dicationic ionic liquids (DILs) were demonstrated as efficient extractants with both high D and high S . However, the high viscosity of the DILs may influence their application. In this work, we found that a hydrophobic DIL ([C 5 (MIM) 2 ][NTf 2 ] 2 ) could dissolve a small amount of water with a solubility of 2.24 wt% at 303.15 K. The viscosity and density of the DIL with different contents of water were investigated from 293.15 K to 333.15 K. A small amount of water in the DIL could decrease its viscosity greatly, while had little effect on its density. The effect of water content in the DIL on the extraction performance was studied, and it was found that both D and S remained high when a small amount of water dissolved in the DIL. The highest selectivity and distribution coefficient for toluene were 45.7, 0.86 (water content: 1.10 wt%) and 41.5, 0.75 (water content: 1.59 wt%), respectively. With increasing the carbon chain of aliphatics, both D tol and D ali decreased, but S increased in the presence of water. All the results indicated that the DIL with a small amount of water not only had high D and S simultaneously, but also enhanced the extraction process. Importantly, the use of water in the extraction process accords with the concept of green chemistry.
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SEPARATION SCIENCE AND TECHNOLOGY
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2019
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IF 1.354
Chenhua Shu,Lina Wang,Peijun Kong,Meizhu Gao
A poly ionic liquid, poly(1-vinyl imidazole)-p-xylylene dichloride (PVIm-PXDC), was synthesized and used for fuel oil denitrogenation. The structure of PVIm-PXDC was characterized and the denitrogenation performance was investigated. Results indicate that the pseudo-second-order kinetic model and Langmuir model are appropriate to describe the adsorption kinetics and thermodynamics, respectively. The adsorption ability of PVIm-PXDC for different nitrogen compounds follows the order of indole > pyrrole > quinoline > pyridine. The equilibrium adsorption amount decreased about 10% for all the nitrogen compounds after six regeneration cycles and the denitrogenation and regeneration processes have no influence on the structure of PVIm-PXDC.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Yuchen Zhu,Jian Xu,Haiyan Zhang,Aodong Zhang,Boxin Chen,Bin Zhao,Lei Li,Xuhong Qian,Ya Cheng,Fei Feng
A novel micro gas chromatography column (μGCC) with straight-sided elliptic microchannel cross sections was prepared by ultrafast laser-assisted chemical etching inside a glass substrate . The straight-sided elliptic cross sections resulted in a uniform distribution of the flow velocity field . This uniform distribution and the use of a microchannel with a consistent composition led to a uniform stationary phase coating. Upon the separation of a test mixture of C7–C11 alkanes, highly symmetrical chromatographic peaks were obtained. The tailing factors of the chromatographic peaks ranged from 0.95 to 1.05, which satisfies the relevant provisions of Pharmacopoeia of the People's Republic of China (ChP). The test results show that the improvement of the tailing factors is mainly due to the optimization of the cross-section structure rather than the optimization of the test conditions. Notably, due to the simple preparation processes and the low cost of the glass substrate, the total manufacturing cost of this novel μGCC is low.
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Small
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2022
·Vol. 18
·期 51
·2205301
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IF 15.153
Jiasheng Rong,Jianxin Zhou,Yucheng Zhou,Cong Hu,Luxian Li,Wanlin Guo
Flexible intelligent materials are desired to effectively regulate their own deformation and accurately sense their immediate morphology at the same time. Graphene foam is an attractive material for strain sensing and electrical/thermal performance control due to its outstanding mechanical, electrical, and thermal properties. However, graphene-foam-based materials with both strain sensing and deformation control capabilities are rarely reported. Here, a multiscale design of graphene foam with a single-layer-graphene-dominated microstructure and resilient 3D network architecture, which leads to exceptional strain sensing performance as well as modulation ability of the electrical and thermal conductivity for shape memory polymers, is reported. The graphene foams exhibit a strain detection limit of 0.033%, a rapid response of 53 ms, long-term stability over 10 000 cycles, significant thermoacoustic effect, and great heat-generation and heat-diffusion ability. By combining these advantages, an electro-activated shape-memory composite that is capable of monitoring its own shape state during its morphing process, is demonstrated.
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Journal of CO2 Utilization
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2022
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IF 8.321
Qiqi Niu,Zhaoxia Dong,Qichao Lv,Fengfan Zhang,Hao Shen,Zihao Yang,Meiqin Lin,Juan Zhang,Kang Xiao
CO 2 enhanced oil recovery is the most realistic carbon capture, utilization, and storage (CCUS) technology to fit the green and low-carbon development concept. During CO 2 injection, gas channeling is a key problem to limiting displacement efficiency, and foam has shown great advantages in sealing channeling technology. However, conventional surfactant-stabilized CO 2 foam is difficult to maintain for a long time. In this paper, CO 2 foam was developed with a single long-chain viscoelastic surfactant (erucyl dimethyl amidopropyl betaine, EAB). Stability mechanism and dynamic evolution of structure were studied using multiple light scattering method. Then, the aggregation and adsorption behaviors of EAB were determined by rheology experiments, dynamic light scattering, cryogenic transmission electron microscopy, and dilatational rheology. The results showed EAB has excellent CO 2 foam performance, and initial volume and the half-life of foam could reach 330 mL and 272 min. Liquid drainage and bubble coalescence of foam were delayed due to the formation of viscoelastic liquid phase and interface. Liquid film thickness was maintained at about 10 µm after 2 h and interfacial dilational modulus was above 25 mN/m, which showed high surface repair efficiency and liquid storage capacity. Apparent viscosity of EAB solution decreased from 89 to 15 mPa·s as the temperature increased, which accelerated the process of water evaporation and liquid drainage. Only enough EAB molecules could effectively reduce initial surface tension from 70 to 56 mN/m to ensure good interfacial properties of foam. At high salt concentration, surface adsorption process to reach equilibrium was extended from 300 to 1400 s and dilational modulus fluctuated between 5 and 20 mN/m, which indicated surface activity and surface repair ability of EAB were inhibited. This study can deepen the understanding of aggregation and adsorption behavior for viscoelastic surfactants and broaden their application in oilfield development.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Yingxi Gao,Jiayi Shi,Jie Wang,Fan Zhang,Shichao Tian,Zhiyong Zhou,Zhongqi Ren
Nervonic acid is the world's first and only potent substance that can repair damaged nerve fibers and promote nerve cell regeneration with high nutritional value. The wide variety of fatty acids in plant oils and fats with similar structures makes the large-scale separation and purification of high-purity nervonic acid very difficult. A new combined process of molecular distillation, urea inclusion and solvent crystallization was established to prepare high-purity nervonic acid with the mixed fatty acids obtained after saponification and acidification of Acer truncatum Bunge oil as raw materials. First, according to the difference in the mean free path of fatty acids, molecular distillation was used to separate and remove C16 saturated fatty acid of palmitic acid and four C18–C20 fatty acids of stearic, oleic, linoleic, and linolenic acids. The content of C16–C20 fatty acids decreased from 72.92% to 19.22% after two-stage molecular distillation processes, in which the contents of saturated fatty acid of palmitic acid decreased to about 0.5%. Then, according to the difference in carbon chain length and saturation of fatty acid, the contents of C22–C24 saturated fatty acids of tetracosanoic and docosanoic acids decreased to 0.21% and 0.07% by urea inclusion with urea/free fatty acid preparation by saponification (SPOMFs) ratio as 0.6. In addition, all saturated fatty acids were basically separated. Finally, according to the difference in the solubility of fatty acids in solvents, the C18–C20 unsaturated fatty acids of oleic, linoleic, and linolenic acids and C22 unsaturated fatty acid of erucic acid were removed by solvent crystallization. The content of C18–C20 unsaturated fatty acids decreased to less than 5% with pentanol as the solvent after the first stage solvent crystallization. The content of erucic acid decreased to 3.47% with anhydrous ethanol as the solvent after the second to fifth stage solvent crystallization. The combined process of molecular distillation, urea inclusion and low temperature crystallization innovatively adopted an efficient, simple and easy-to-industrial solvent crystallization method to separate erucic and nervonic acids, obtaining nervonic acid with purity of 96.53% and final yield of 47.99%.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2019
·Vol. 25
·期 6
·595-602
·
IF 0
Wang Nan,Ma Qingqing,Yuan Enxian,Wang Li
SBA-15 silica was synthesized by adding normal paraffin and alkyl benzene as swelling agents and using a low-temperature gelation procedure. Pd was then impregnated on SBA-15, yielding a catalyst. Characterizations of the catalyst by X-ray diffraction, N 2 adsorption/desorption, scanning electron microscopy, transmission electron micrographs, X-ray photoelectron spectroscopy, in situ FTIR, and a hydrogenation test of 2-ethyl-anthraquinone reveal that the addition of C 6 ‒C 9 normal paraffin and 1,3,5-triisopropylbenzene could enlarge the pore diameter without a significant loss of ordered structure. Moreover, the length of SBA-15 pore channels decreased significantly. However, the sizes of Pd particles increase as the pore diameter is enlarged. The largest pore size (13.6 nm) and short length of pore channels (ca. 0.35 μm) are achieved by adding n-hexane. As a result, this catalyst exhibits the highest hydrogenation activity with an approximately 100% improvement, compared with a conventionally synthesized catalyst in the absence of a swelling agent.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Shiyi Chen,Mengli Ma,Juan Peng,Xiaogang He,Qian Wang,Ganghui Chu
Candida rugosa lipase (CRL, EC3.1.1.3) is one of the main enzymes synthesizing esters, and ZIF-8 was chosen as an immobilization carrier for lipase. Enzyme activity testing often requires expensive reagents as substrates, and the experiment processes are time-consuming and inconvenient. As a result, a novel approach based on near-infrared spectroscopy (NIRs) was developed for predicting CRL/ZIF-8 enzyme activity. The absorbance of the immobilized enzyme catalytic system was evaluated using UV–Vis spectroscopy to investigate the amount of CRL/ZIF-8 enzyme activity. The powdered samples' near-infrared spectra were obtained. The sample’s enzyme activity data were linked with each sample’s original NIR spectra to establish the NIR model. A partial least squares (PLS) model of immobilized enzyme activity was developed by coupling spectral preprocessing with a variable screening technique. The experiments were completed within 48 h to eliminate inaccuracies between the reduction in enzyme activity with increasing laying-aside time throughout the test and the NIRs modeling. The root-mean-square error of cross-validation (RMSECV), the correlation coefficient of validation set (R) value, and the ratio of prediction to deviation (RPD) value were employed as assessment model indicators. The near-infrared spectrum model was developed by merging the best 2nd derivative spectral preprocessing with the Competitive Adaptive Reweighted Sampling (CARS) variable screening method. This model's root-mean-square error of cross-validation (RMSECV) was 0.368 U/g, the correlation coefficient of calibration set (R_cv) value was 0.943, the root-mean-square error of prediction (RMSEP) set was 0.414 U/g, the correlation coefficient of validation set (R) value was 0.952, and the ratio of prediction to deviation (RPD) was 3.0. The model demonstrates that the fitting relationship between the predicted and the reference enzyme activity value of the NIRs is satisfactory. The findings revealed a strong relationship between NIRs and CRL/ZIF-8 enzyme activity. As a result, the established model could be implemented to quantify the enzyme activity of CRL/ZIF-8 quickly by including more variations of natural samples. The prediction method is simple, rapid, and adaptable to be the theoretical and practical basis for further studying other interdisciplinary research work in enzymology and spectroscopy.
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CHEMICAL ENGINEERING JOURNAL
·
2026
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IF 12.5
Weizhen Zhang,Wenqian He,Qian Yan,Lele Zhang,Nan Ni,Shaorui Song,Shuhua Tu,Jie Feng
Surfactant-free interfacial synthesis of hollow Al 2 O 3 via kinetic modulation • Chelation enables precursor transition from hydrophobic to amphiphilic states. • Simple room-temperature strategy bypasses harsh energy-intensive methods. • PDRC coatings deliver 97.6% solar reflectance and 0.976 mid-IR emissivity. • The scalable coatings realize a remarkable sub-ambient cooling of 9.66 °C. Hollow γ-Al 2 O 3 architectures are highly attractive for passive daytime radiative cooling (PDRC) owing to their low density and unique optical characteristics. However, their fabrication typically relies on sacrificial templates, hydrothermal treatments, or high-temperature processing, while the intrinsically ultrafast hydrolysis of aluminum alkoxides has long prevented their use in hollow-structure engineering. Here, we report a surfactant-free, chelation-enabled interfacial synthesis strategy that overcomes this limitation through kinetic regulation of aluminum sec-butoxide. The coordination process gradually transforms the precursor from hydrophobic to amphiphilic, enabling spontaneous self-emulsification and controlled interfacial assembly. As a result, hierarchical hollow γ-AlO(OH) microspheres are obtained at room temperature and subsequently converted into hollow γ-Al 2 O 3 microspheres by calcination. The resulting hollow γ-Al 2 O 3 microspheres exhibit tunable diameters (3.3–15.8 μm), uniform nanoscale shells (162 ± 60 nm), and an ultralow density of 0.083 g·cm −3 . The process is readily scalable using an industrial homogenizer. When incorporated into coatings, the hollow microspheres provide abundant dielectric interfaces that enhance solar reflection and thermal emission, delivering a solar reflectance of 97.6%, an atmospheric window emissivity of 0.976, and a sub-ambient cooling of 9.66 °C under a solar irradiance of 454.5 W·m −2 . This work provides a scalable and energy-efficient manufacturing strategy for hollow γ-Al 2 O 3 architectures, offering significant potential for large-area radiative cooling coatings and thermal management applications. Download: Download high-res image (108KB) Download: Download full-size image
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Journal of Cleaner Production
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2023
·
IF 11.1
Teng Lu,Zhaomin Li,Liping Du
With declining conventional reserves, tapping heavy oils generates substantial emissions yet is essential to meet energy demands. This study pioneers an integrated approach using silica aerogels to develop thermally stable flue gas foams for enhanced CO 2 sequestration and heavy oil recovery. Microfluidic experiments and molecular dynamics simulations revealed a 5-fold decrease in gas diffusion rates for aerogel-stabilized versus pure surfactant foams at 95 °C due to the ultralow thermal conductivity of the nanoparticle coating layer . The thermally stable nanoengineered foams demonstrated a remarkable 81.23% CO 2 trapping efficiency in heterogeneous cores, surpassing conventional flue gas foam. Additionally, three-dimensional simulations in an oil reservoir model showed improved vertical conformance and oil recovery with aerogel-stabilized foam. The exceptional insulating properties redirected heat downward to enhance sweep efficiency. This novel concept transforms flue gas emissions into value-added foams for concurrent environmental and productivity benefits during heavy oil development.
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危险品化学品经营许可证（带存储）