CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Wentao Hao,Jian Xu,Ran Li,Xiangzheng Zhao,Longzhen Qiu,Wen Yang
Oil spillages and industrial discharge of oily water have caused severe damage to global environment. Currently a great many of oil-absorbing materials including graphene aerogels, superhydrophobic cellulose aerogels and polymer foams have been developed to effectively separate oil and water. However, most of the absorbing materials show limitations in separation of high-viscosity oils because the diffusion speed of high-viscosity oils into the porous materials is very slow at room temperature. In this article, a novel oil/water separation material was fabricated from rock wool superhydrophobically modified by PDMS/SiO 2 nanoparticle treatment. The modified rock wool could circularly absorb spilled oil and reload after combustion or squeezing. Most importantly, the modified rock wool worked well in continuously collecting high-viscosity oil with the aid of electric heating due to its excellent heat resistance. Because the rock wools have been industrially produced in large scale with very low prices and they are degradable naturally, this kind of spilled oil treatment was demonstrated to be a low-cost and environment-friendly method for the high-viscosity oil separation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2020
·
IF 3.35
Shaojian Hu,Jianhua Zhu,Bencheng Wu,Rui Ma,Xiaohui Li
As an eco-friendly lubricant base oil, ester base oil is receiving increasing attention. However, studies on synthetic reaction kinetics of high viscosity complex ester have been rarely reported. In this work, based on the principle of equal reactivity of all functional groups and simplified kinetics models, synthetic reaction kinetics for high viscosity complex ester was investigated in two steps. As for the esterification of trimethylolpropane with glutaric acid, the activation energies of the first and second stage were 55.3 and 73.5 kJ/mol, respectively. As for the esterification of the first step products with 2-ethylhexanoic acid, the activation energies of the first and second stage were 60.6 and 98.2 kJ/mol, respectively. As for the esterification of the first step products with n -heptanoic acid, its activation energy was 68.9 kJ/mol. A mutation phenomenon on reaction order from zero to second order was discovered, which could be explained by the strong adsorption of organic acid on catalyst surface. The conversion rate of carboxyl of synthetic reaction for mixed acid ester was estimated by simulation, and average relative error was less than 3.0%. The synthetic process of high viscosity complex ester was considered to consist of a series of parallel–consecutive reactions with addition–elimination mechanism.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 4
·1901671
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IF 4.948
Miao Yu,Peng Xu,Jin Yang,Lai Ji,Changsheng Li
For dealing with crude oil spills, the high viscosity of crude oil greatly limits the absorption capacity of the absorbent materials, making crude oil a major obstacle in the cleaning process. Herein, a MoS 2 -rubber sponge (MoS 2 -RS), as a photothermal sorbent, is prepared by a one-step in situ synthesis. The sponge exhibits excellent superhydrophobicity (the water contact angle is 151°), a high absorption capacity for oils and organic liquids (15–67 g g −1 ), and an outstanding compressive elasticity of 38.6 kPa. Furthermore, MoS 2 -RS shows a good photothermal conversion capability. Under illumination, the viscosity of crude oil could be effectively reduced due to the rapid temperature rise in MoS 2 -RS. This response allows the modified sponge to quickly absorb crude oil, which significantly reduces the adsorption time of 20 µL crude oil from 16 h to 19 s when compared to that of absorbent materials without a photothermal conversion capability. Because of the excellent mechanical performance, MoS 2 -RS could be installed in a vacuum pump to continuously collect crude oil from the water surface. This setup greatly improves the crude oil collecting efficiency. The new photothermal absorbent material shows great potential for the collection of crude oil and the cleanup of spill accidents.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2023
·
IF 5
Jie Liang,Chao Shan,Mengda Tian,Hao Wang,Tao Hu,Qing Yang,Feng Chen
Transparent surfaces with anti-pollution and anti-adhesive properties show promise for optical windows. However, there is currently no effective way to create glass surfaces that are impervious to highly viscous and sticky oils, like crude oil. In this research, an electrical-heating silica glass with resistance to high viscosity oil was prepared using a femtosecond laser process. An inner micro-channel system was fabricated by the femtosecond laser wet etching method, and the surface was treated to be superhydrophilic/underwater superoleophobic through femtosecond laser irradiation. The prepared sample could be electrically heated by its internal heating unit, which could reduce the viscosity of the crude oil. Thus, the prepared sample is resistant not only to typically low-viscosity oils, but also prevents the adhesion of crude oil, which would be widely applied in anti-pollution optical windows.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Microsystems & Nanoengineering
·
2023
·Vol. 9
·期 1
·1-13
·
IF 7.9
Huang Biao,Ge Xinjin,Rubinstein Boris Y.,Chen Xianchun,Wang Lu,Xie Huiying,Leshansky Alexander M.,Li Zhenzhen
Micron- and submicron-sized droplets have extensive applications in biomedical diagnosis and drug delivery. Moreover, accurate high-throughput analysis requires a uniform droplet size distribution and high production rates. Although the previously reported microfluidic coflow step-emulsification method can be used to generate highly monodispersed droplets, the droplet diameter ( d ) is constrained by the microchannel height ( b ), \(d\gtrsim 3b\) , while the production rate is limited by the maximum capillary number of the step-emulsification regime, impeding emulsification of highly viscous liquids. In this paper, we report a novel, gas-assisted coflow step-emulsification method, where air serves as the innermost phase of a precursor hollow-core air/oil/water emulsion. Air gradually diffuses out, producing oil droplets. The size of the hollow-core droplets and the ultrathin oil layer thickness both follow the scaling laws of triphasic step-emulsification. The minimal droplet size attains \(d\approx 1.7b\) , inaccessible in standard all-liquid biphasic step-emulsification. The production rate per single channel is an order-of-magnitude higher than that in the standard all-liquid biphasic step-emulsification and is also superior to alternative emulsification methods. Due to low gas viscosity, the method can also be used to generate micron- and submicron-sized droplets of high-viscosity fluids, while the inert nature of the auxiliary gas offers high versatility.
研究领域:
生物医学工程
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 49
·2304430
·
IF 29.4
Xianmei Huang,Shuqiang Peng,Longhui Zheng,Dongxian Zhuo,Lixin Wu,Zixiang Weng
Elastomers prepared via vat photopolymerizationus ually exhibit unsatisfied mechanical properties owing to their insufficient growth of molecular weight upon UV exposure. Increasing the weight ratio of oligomer in the resin system is an effective approach to enhance the mechanical properties, yet the viscosity of the UV-curable resin increases dramatically; this hinders its printing. In this study, a linear scan-based vat photopolymerization (LSVP) system which can print high-viscosity resins is implemented to 3D print the oligomer-dominated UV-curable resin via a dual-curing mechanism. A polyurethane methacrylate blocking oligomer is first synthesized and then mixed with a commercialized bifunctional oligomer, photoinitiator, and primary amine as a chain extender to prepare high-viscosity UV-curable resin for the LSVP system. The deblocked isocyanate is further crosslinked with a chain extender via thermal treatment to construct a highly entangled polymer chain network. The optimal thermal treatment parameters are investigated, and the resilience of the 3D-printed elastomer is evaluated through continuous tensile loading and unloading tests. Subsequently, complex structured elastomers are printed, exhibiting favorable mechanical durability without defects. The results obtained from this work will provide a reference for preparing elastomeric devices with excellent physical properties and expand the application scope of vat photopolymerization to new fields.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Weixiang Chao,Shaobin Wang,Yudong Li,Guoliang Cao,Yusen Zhao,Xiaohan Sun,Chengyu Wang,Shih-Hsin Ho
An efficient collection and recovery of high-viscous crude-oil from oil spillage through an environmental-friendly way is extremely important for water remediation. Herein, a new material of thermally-reduced graphene-oxide coating and decoration of hydrophobic-layer over a compressible wood-sponge was proposed as an adsorbent. Owing to the preferable photothermal conversion, an in-situ solar-assisted thermogenesis process could increase the temperature to 88 °C within 100 s under 1 sun illumination and decrease the viscosity of crude-oil for easy adsorption. The fabricated adsorbent exhibited great performances in separation and adsorption (7.28 g/g–0.801 g/cm 3 ) of oil-spill; with fully active-collection of 50 mL crude-oil within 20 min. Numerical modeling was also employed to gain an in-depth understanding of the adsorption and regeneration processes. The temperature gradient and structural dots subjected to compression stress for both photothermal induced adsorption and compressible recovery of crude oil were investigated as the dominant factors. The adsorbent also exhibited satisfactory adsorption and separation capacities for common light oils and heavy oils. Moreover, the adsorbent could be employed for feasible adsorption in semi-open seawater-environment under light, showing potential for practical treatment of offshore oil-spillage. This work designed a potential route to overcome the dilemma of crude-oil adsorption, due to its inherent high-viscosity, through in-situ photothermal thermogenesis using environment-friendly materials derived from natural wood. The knowledge obtained from this work would help in developing novel adsorbents with applied and ecological merits and further understanding of the related mechanisms.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
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IF 10.53
Mengmeng Liu,Liqiang Shen,Jianqiang Wang,Yajie Ding,Yong Zhou,Fu Liu
Membrane separation has been considered as a promising technology for oily wastewater treatment . However, membrane fouling significantly limited its practical applications especially for oils with high viscosity and concentration. In this study, we propose membrane based nondispersive solvent extraction for continuous separation and recovery oils with high viscosity and concentration from oil-in-water emulsion. In this process, oil-in-water emulsion and extraction solution (hexane) was separated by a porous hydrophobic poly (vinylidene fluoride) (PVDF) nanofibrous membrane and flowed on each side of the membrane. The strong affinity of PVDF membrane and high solubility of hexane towards oil (e.g., lubricant oil) endowed continuous transfer of oil from emulsion side to hexane side. Different from conventional physical sieving, fouling enhanced transfer of lubricant oil in this process. Lubricant oil flux was up to about 336 g/m 2 when 1% lubricant oil-in-water emulsion was used and increased to 935 g/m 2 in case of 10%. Moreover, lubricant oil can be easily recovered through hexane evaporation both in low (17 o C) and relative high temperature (67 o C). Water content of recovered oil (0.10 ± 0.02%) was almost the same as original samples (0.11 ± 0.02%). Strategy proposed in the current study offers an effective way for treating oil-in-water emulsion with high viscosity and concentration.
研究领域:
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 3
·459
·
IF 4.329
Kangkang Yu,Tao Yuan,Songdi Zhang,Chenlu Bao
Thermal conductive polymer composites (filled type) consisting of thermal conductive fillers and a polymer matrix have been widely used in a range of areas. More than 10 strategies have been developed to improve the thermal conductivity of polymer composites. Here we report a new “hypergravity accumulation” strategy. Raw material mixtures of boron nitride/silicone rubber composites were treated in hypergravity fields (800–20,000 g, relative gravity acceleration) before heat-curing. A series of comparison studies were made. It was found that hypergravity treatments could efficiently improve the microstructures and thermal conductivity of the composites. When the hypergravity was about 20,000 g (relative gravity acceleration), the obtained spherical boron nitride/silicone rubber composites had highly compacted microstructures and high and isotropic thermal conductivity. The highest thermal conductivity reached 4.0 W/mK. Thermal interface application study showed that the composites could help to decrease the temperature on a light-emitting diode (LED) chip by 5 °C. The mechanism of the improved microstructure increased thermal conductivity, and the high viscosity problem in the preparation of boron nitride/silicone rubber composites, and the advantages and disadvantages of the hypergravity accumulation strategy, were discussed. Overall, this work has provided a new, efficient, and simple strategy to improve the thermal conductivity of boron nitride/silicone rubber and other polymer composites (filled type).Keywords:boron nitride;silicone rubber;hypergravity;thermal conductivity;microstructure;high viscosity problem;MPPT theory;thermal conductive polymer composites;fillers
研究领域:
材料科学
·
热传导工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Lian Yin,Mengqing Zhou,Yongqian Shi,Keqing Zhou
Rapid and safe implementation of viscous crude oil cleanup is still a daunting challenge. Superhydrophobic materials are outstanding candidates for handling solvent spills, but are limited to recovering low viscosity oil and organic solvents. Hence, a polyurethane foam (PMRP-PU) integrating superelasticity, dual solar-responsive and fire resistance was fabricated by blending MXene and reduced graphene oxide (RGO) via self-foaming method. The surface temperature of the PMRP-PU reached 105 °C after simulated sunlight irradiation for 600 s. PMRP-PU had outstanding adsorption performance for low-viscosity oil and organic solvent (∼70.1 g/g) at room temperature, and the adsorption capacity of high-viscosity oil was also increased by 202.1 % compared with pure PU. Additionally, the adsorption capacity of PMRP-PU-3 remained at 92.7 % of the original level after 20 cycles of experiments. Excellent acid and alkali resistance and high temperature stability also greatly improved the environmental adaptability of the foam. Contrary to the flammability of pure PU, the peak heat release rate and total heat release of PMRP-PU-3 were decreased by 22.6 % and 25.2 %, respectively, and the melt dripping phenomenon disappeared during burning, exhibiting excellent fire safety. Briefly, this polyurethane foam can be repeatedly used for oil spill cleaning, and has a broad development prospect in the field of oil-water separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Pei Xie,Kai Wang,Guangsheng Luo
The preparation of bromobutyl rubber (BIIR) faces two challenges, the high viscosity of the reaction system and the accumulation of generated HBr during the reaction, which result in lower productivity, higher energy consumption, and lower selectivity for BIIR-1. In this work, we developed an efficiently intensified technology using calcium stearate as the acid scavenger and a microreactor as the reaction platform. We successfully realized both high productivity and high selectivity for synthesizing high concentrations of bromobutyl rubber. The optimized results indicate that using predispersed calcium stearate in a butyl rubber (IIR) solution (xCa of about 0.8 wt %) as the acid scavenger could guarantee sufficiently high selectivity for BIIR-1 (w of almost 95%). A T-junction microreactor with slitlike microchannels is suitable for mixing a high-viscosity IIR solution and a Br2 solution. As the concentration of IIR increases from 10 wt % to 15 wt %, the conversion of IIR could increase by 13%, and the residence time could be shortened to less than 1 min. The utility of the reactants and the reaction efficiency have both been largely improved.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Lei Zhu,Hongye Lu,Tianci Huo,Dongxiao Liu,Zechen Yan,Jianqiang Zhang
The frequent oil leakage accidents cause huge loss of natural resources and serious damage to the ecosystem. Although all kinds of modified sponges have been invented to deal with the offshore oil spills, it is difficult to separate high viscosity crude oil and water-in-oil emulsions. To address these challenges, a modified polyurethane (PU) sponge (PDMS/MOF-74@PU) coated by polydimethylsiloxane (PDMS) with ultra-low surface energy after growing spindle-shaped metal–organic framework structure (MOF-74) on the PU sponge surface was prepared. With the advantages of super-hydrophobic and high porosity, the prepared sponge can selectively and effectively absorb various oils from oil/water mixtures and it has good oil adsorption capacity (18–55 g/g). Meanwhile, the black MOF-74 endows the PDMS/MOF-74@PU photothermal properties for the separation of high viscosity crude oil under the light conditions. As well as, the prepared sponge shows excellent separation performance for the water-in-oil emulsions, the amount of water in the oil could reduce to less than 20 ppm and the separation efficiency could reach as high as 99.9 % after separation. In addition, we used molecular dynamics to verify the mechanism by which PDMS coatings change the surface wettability of materials. With the excellent mechanical property, chemical stability, and thermal stability in various harsh environments, the PDMS/MOF-74@PU have a broad application prospect in the treatment of offshore oil spills.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）