FUEL
·
2025
·
IF 7.5
Junjie Liu,Jianmin Wu,Qiwen Sun,Jiancheng Wang,Yan Sun,Hengxuan Zhang
The high-viscosity poly-alpha-olefin was prepared from Fischer-Tropsch mixed α-olefins (FTO) polymerization under [EBIZrCl 2 /Al( i Bu) 3 /[Ph 3 C] + [B(C 6 F 5 ) 4 ] - system (EBI = rac -C 2 H 4 (1-Ind) 2 ), and its mechanism was investigated by in situ UV–Vis, 1 H NMR and ESI-MS. The results show that the kinematic viscosity at 100°C (KV 100 ), viscosity index (VI) and yield of product reach to 306.3 cSt, 244 and 81.12 % under optimum reaction condition, respectively. Through adjusting temperature to 20°C, in situ UV–Vis, 1 H NMR and ESI-MS are conducted to monitor the formation of origin species (EBIZr( i Bu) 2 + ), active species (EBIZr-σ-y n + (y = nonenyl, decenyl and undecenyl, n ≥ 1)), reactivated species and dormant species (EBIZr-η 3 -(1-R-C m H m+1 ) + (R = n-propyl and m = 6 or 7 or 8)). The simultaneous generation of active and dormant species is observed, and the reaction process is described as [FTO] + [catalyst] → [active species] + [dormant species]. This reaction fitting curve also conforms to the Boltzmann (R 2 ≥ 0.993). The effect of different types of olefins on catalytic evolution and product properties is investigated. The existence of multiple α-olefins inhibits the formation of the second inactivate species found in 1-decene polymerization. However, the multiple isomeric olefins further enhance the possibility of dormant species generation, because of the promotion of β-H concentration in catalytic system, leading to the higher activation energy (19.597kJ/mol) than pure 1-decene (10.949kJ/mol). Based on those findings, a possible mechanism in ansa-zirconocene catalyzed to prepare high-viscosity poly-alpha-olefin from Fischer-Tropsch mixed α-olefins is proposed.
研究领域:
高分子化学
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催化化学
·
石油化学
·
材料科学
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工业化学
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反应机理
·
流变性能
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Qian Jia,Tong Zou,Yukai Huang,Linlin Yu,Bin Zhang,Wenyu Wang,Shijie Zhang,Meng Guo,Ruoyu Chen
The management of high-viscosity crude oil leaks has become an environmental problem due to the fluid characteristics, and common adsorption materials are difficult to cope with. Based on the photothermal viscosity reduction technology, a superhydrophobic melamine composite sponge (OTS/CuS@CuFe-MOF/MS) with synergistic functions of magnetic control drive, photothermal conversion, and organic dye catalysis was prepared. The adsorbent material was prepared by loading core–shell structured CuS@CuFe-MOF and modifying octadecyltrichlorosilane (OTS) on melamine sponge as the substrate, showing excellent hydrophobic properties (WCA = 157.4°) and a stable oil–water separation efficiency of 98.9 % (20 cycles). Based on the photothermal synergistic effect of CuS@CuFe-MOF, OTS/CuS@CuFe-MOF/MS achieved a rapid temperature rise of 112.5 °C under 8.95 kW/m 2 light irradiation, and the pump oil adsorption amount increased significantly from 31.61 g/g to 57.02 g/g (an increase of 80.3 %). Additionally, the modified sponge had both photo-Fenton catalytic ability and could simultaneously purify oily wastewater. This multifunctional sponge provides an efficient and environmentally friendly solution for the magnetic control recovery of high-viscosity crude oil, and has important application value in the fields of environmental remediation and industrial cleaning.
研究领域:
环境修复
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材料科学
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化学工程
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纳米技术
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催化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 17
·3483-3489
·
IF 4.726
Di-Wei Zheng,Jiang-Lan Li,Cao Li,Zu-Shun Xu,Si-Xue Cheng,Xian-Zheng Zhang
High viscosity is important for normal intracellular homeostasis. In this study, nanoporous drug delivery systems (DDSs), including mesoporous silica nanoparticles (MSNs) and layer by layer (LBL) microcapsules, with a viscosity enhanced release (VER) effect were designed and prepared, and their drug release behaviors in a sticky environment with a high viscosity were investigated using rhodamine B, methylene blue and doxorubicin (DOX) as model drugs. The results showed that the drug release rate from DDSs in a biomimetic high viscosity solution was 7 to 8 times higher than that in water. A semipermeable membrane model was used to explain the VER effect. The results indicate that the existence of macromolecules in the release medium caused a VER effect. The VER effect found in this study will provide a new concept to guide the design of DDSs in a high viscosity environment in vivo.
研究领域:
药剂学
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomimetics
·
2025
·Vol. 10
·期 9
·585
·
IF 3.9
Tianwen Wang,Song Song,Shiwen Bao,Yanfeng Gong,Yujue Wang,Chuncai Wang,Wenshao Ma,Nuo Liu,Kunyan Sui,Jun Gao,Xueli Liu
Oil spills and oily wastewater discharges have posed severe threats to the ecosystem and human health, yet efficient cleanup and recovery remain huge challenges. The absorption of crude oil is especially difficult due to its high viscosity. In this study, we propose a strategy for the fast and highly selective absorption of crude oil as well as other oils and organic solvents with variable viscosity by combining the desert beetle’s back-inspired gradient hydrophobicity with the photothermal effect to enhance the absorption rate. The oil-absorbent material was prepared through the alkylsilane-based gradient chemical modification of MXene-polyurethane sponges. The hydrophobic gradient across the composite sponge offers an extra driving force for the selective oil wetting in the sponge. Owing to the synergistic effect between gradient wettability and photothermal heating, a faster absorption rate, in addition to the high separation rate, was achieved for a variety of oils, including thick crude oil, thin crude oil, and light diesel oil, compared to that without gradient wettability. The as-prepared material is robust with good repeatability for the oil absorption. The surface silane modification was also demonstrated to help prevent the oxidation of MXene, facilitating the long-term stability of the material. This study will enlighten the development of fast and highly selective liquid absorbents.
研究领域:
环境科学技术
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材料科学
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化学工程
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纳米技术
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可持续能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 38
·e202302822
·
IF 2.1
Jiajia Fu,Chen Chen,Qiong Tang,Hong Xu,Lei Liu,Jinxiang Dong
Graphical At low temperatures, an efficient synthesis of polycyclic alkylated compounds by tetralin and 1,7-octadiene using Et 3 NHCl−AlCl 3 ionic liquid has been developed. The polycyclic alkylated tetralin with high viscosity has excellent tribological properties, which provides a new route for the production of high viscosity lubricating base oils from coal-based feedstocks. A novel polycyclic alkylated tetralin (PAT) similar to the naphthenic oil was successfully synthesized through Friedel-Crafts alkylation. This was accomplished by reacting coal-based chemical tetralin with 1,7-octadiene, using Et 3 NHCl−AlCl 3 ionic liquid as a catalyst. To enhance the selectivity towards dialkylated products (C28−2THN), the reaction conditions were systematically studied. Interestingly, the reaction could proceed well even at a low temperature of 0 °C and the selectivity for C28−2THN products could reach 54.0 %. The primary physicochemical properties of PAT were investigated in detail, it was found that the existence of polycyclic structures contributes to high viscosity, better thermal-oxidative stability and good polarity. Compared with octyltetralins- and commercial alkylnaphthalene-based oil (AN30), the PAT exhibited superior friction-reducing and anti-wear properties under the load of 100 N at 50 °C due to its rigid cycle structures and flexible chain.
研究领域:
化学工程
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材料科学
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润滑技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Dongsheng Song,Congcong An,Zhe Zhang,Yu Qiu,Zhimin Zhao,Dingqiang Zheng,Ming Zhang
A superhydrophobic CNF/PDA composite membrane has been developed to revolutionize oily wastewater treatment for achieving high efficiency, cost-effectiveness, and environmental sustainability. Inspired by the adhesive properties of mussels and the self-cleaning mechanism of lotus leaves, this innovative material is fabricated through a novel lyophilization and spray modification process using cellulose nanofibers (CNF), dopamine hydrochloride (DA), and octadecylamine (ODA). The membrane is synthesized via an aerobic, weakly alkaline self-polymerization process, which facilitates the formation of robust covalent and non-covalent bonds between the catecholamine structure of DA and CNF. ODA is integrated through hydrogen bonding and Schiff base reactions with polydopamine (PDA), enhancing structural stability. The resulting membrane demonstrates a tensile strength of 2.9 MPa, alongside exceptional separation efficiency (98.5 %) and flux rates (3745 L·m −2 ·h −1 ). Even after five consecutive water-in-oil (W/O) emulsion separation cycles, a separation efficiency exceeding 91.8 % is maintained, with hydrophobicity and structural integrity preserved. Durability tests confirm its robustness, with 98.5 % of initial capacity retained after ten adsorption-desorption cycles. The membrane's porous architecture and photothermal brown-black hue synergistically boost light-to-heat conversion, facilitating swift thermal response and efficient high-viscosity oil uptake. This demonstrates viable applications as a sustainable solution for oily wastewater treatment, promoting greener industrial application.
研究领域:
环境科学
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材料工程
·
化学工程
·
绿色技术
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2020
·
IF 5.578
Shaojian Hu,Jianhua Zhu,Bencheng Wu,Rui Ma,Yuechun Chang,Xiaohui Li,Yuqing Wei,Liujie Yu
High viscosity ester base oil, as an eco-friendly lubricant base oil with high performance, can significantly reduce the friction, wear, and energy consumption of large machinery. However, there is less research on the preparation of heterogeneous catalysts for synthesis of high viscosity ester oil. In this work, Sn/Zr mixed oxide catalysts were prepared for the green synthesis of ester base oil with high viscosity. This approach gets rid of additional template, surfactant, organic solvent, sulfur, nitrogen, phosphorus, and halogen, thereby avoiding the potential environmental pollution. A superior powdered catalyst MO-Sn 8 Zr-9.0-160-18 was developed with optimized Sn/Zr molar ratio, pH, hydrothermal temperature, and hydrothermal time of 8:1, 9.0, 160 °C, and 18 h, respectively. Results of catalyst characterization indicated that the developed catalysts were mesoporous materials with hydrophobic properties, allowing for free diffusion of macromolecules, adsorption of reactants, and desorption of water. Additionally, the specific surface area, pore volume, pore diameter, and surface hydrophobicity of catalyst were enhanced by doping Zr, so the catalysts with higher [Sn/Zr] ICP /[Sn/Zr] XPS exhibited better catalytic activity. Preformed catalyst was prepared by simple mechanical mixing method to achieve better catalyst separation. The specific surface area, acid amount, and acid strength of catalyst were indeed improved significantly after catalyst molding. By programmed heating, the preformed catalyst achieved a maximum carboxyl conversion of 97.2%. Moreover, spent catalyst could be reactivated via solvent washing, drying, calcination, and hydrogen reduction, exhibiting good reusability.
研究领域:
化学工程
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材料科学
·
催化
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Intelligent Systems
·
2023
·Vol. 5
·期 3
·2200311
·
IF 7.4
Yin Chen,Mingliang Li,Qianqian Tang,Yifan Cheng,Anqi Miao,Liang Cheng,Shilu Zhu,Tingting Luo,Guangli Liu,Lijiu Zhang,Fuzhou Niu,Liang Zhao,Jialong Chen,Runhuai Yang
Untethered synthetic microrobots have significant potential to revolutionize biomedical interventions therapy in the future. However, the relatively slow speed of microrobots and viscosity biofluid environments are some of barriers standing in the way of microrobots’ biomedical applications. Herein, inspired by high-speed biological escape propulsion, NIR-driven microrobots with a high-speed, unidirectional propulsion in the high-viscosity liquid are proposed. The bubble's growth and ejection cause the proposed 3D-printed microrobot to propel forward. The 3D-printed claw-like microrobot achieves motion average speed of 1.4 mm s −1 (three-body length (bl) s −1 ) when driven by NIR light in a pure glycerol viscous (945 mPa s, 25 °C) environment, which has a viscosity that is more than 200 times the viscosity of blood and of 54 mm s −1 (120 bl s −1 ) when driven by NIR light in deionized (DI) water. This work provides more ideas for the design and propulsion of light-driven microrobots in a high-viscosity vivo environment, which may broaden the applications of microrobots in the biomedical field, such as propulsion and navigation in confined and hard-to-reach body location areas.
研究领域:
生物医学工程
·
微/纳机器人技术
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 26
·10137-10145
·
IF 0
Aikifa Raza,Bin Ding,Ghazala Zainab,Mohamed El-Newehy,Salem S. Al-Deyab,Jianyong Yu
Creating a practical and energy-efficient method with high efficacy to separate oil–water mixtures, especially those stabilized by surfactants, has proven to be extremely challenging. To overcome this challenge, a novel and scalable strategy was developed for the synthesis of superhydrophilic and prewetted oleophobic nanofibrous membranes by the facile combination of in situ cross-linked polyethylene glycol diacrylate nanofibers supported on polyacrylonitrile/polyethylene glycol nanofibrous (x-PEGDA@PG NF) membranes. The as-prepared x-PEGDA@PG NF membranes have shown superhydrophilicity with ultralow time of wetting and promising oleophobicity to achieve effective separation for both immiscible oil–water mixtures and oil-in-water microemulsions solely driven by gravity. These new membranes having a good mechanical strength of 14 MPa and mean pore sizes between 1.5 and 2.6 μm have shown a very high flux rate of 10 975 L m−2 h−1 with extremely high separation efficiency (the residual oil content in filtrate is 26 ppm). More importantly, the membranes exhibit high separation capacity, which can separate 10 L of an oil–water mixture continuously without a decline in flux, and excellent antifouling properties for long term use, thus making them important candidates for treating wastewater produced in industry and daily life. Such membranes are also ideal for high viscosity oil purification such as purification of crude oil.
研究领域:
材料科学
·
环境工程
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
SmartMat
·
2022
·Vol. 4
·期 1
·e1133
·
IF 0
Yahui Cai,Jianfei Wu,Kaili Wang,Youming Dong,Jundie Hu,Jiafu Qu,Dan Tian,Jianzhang Li,Qiliang Fu
Designing highly porous materials is of great importance for liquid separation, water purification, and disinfection, such as spill oil cleaning and recycling, seawater desalting, and oil/water separation. However, a remaining challenge is to produce porous materials with the characteristics of fast absorption, continuous directional transport, and self-release of viscous liquid. Herein, a functional cellulosic composite is reported by the chemical treatment and functionalization of wood resulting in a smart wood that can thermally self-release and separate high viscosity oil. The smart wood has a high absorption speed of 1398 mL/(m 2 ·s) (ethylene glycol) and a maximum absorption capacity of 47.2 g/g (chloroform) due to its intrinsic vertical micro/nanoscale channel structure, low tortuosity, and high porosity. Moreover, the switchable wettability is achieved by the surface coating of poly(N-isopropylacrylamide) on the porous wood, which enables the collection and removal of oil from the oil/water mixture. The high viscosity oil can be automatically released due to the passive oil release at room temperature. The release capacity of the smart wood remains above 91% after 15 cyclic tests. We envision that this functional smart wood could be extended to a wide range of applications in smart hydrogels, microfluidics, artificial drug release, and environmental restoration.
研究领域:
材料科学
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环境科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）