Nano Energy
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2019
·
IF 15.548
Lijun Yang,Shuai Chi,Shunping Dong,Fen Yuan,Zhaoding Wang,Jingxin Lei,Lixia Bao,Jun Xiang,Jiliang Wang
The quasistatic piezoelectric coefficient ( d 33 ) of the state-of-the-art bulk polymers is lower than 38 pC N −1 , extremely restricting their application in the fields of next generation of smart and wearable devices . Herein, a novel soluble and meltable piezoelectric bulk copolyimide with the d 33 of about 420 pC N −1 has been successfully synthesized by co-polymerizing pyromellitic dianhydride with p-phenylenediamine and the specially designed NH 2 -ended imidazole ionic liquid . Molecular structure, solubility, melt processability , and piezoelectricity of the resulting piezoelectric copolyimide have been extensively investigated. Relevant results reveal that the d 33 value of the obtained piezoelectric copolyimide is found to be 10 and 50–100 times higher than the reported bulk poly (vinylidene fluoride) and polyimides , respectively. It still surpasses 250 pC N −1 as the storage temperature approaches 150 °C, evidently higher than that of the previously reported polymer based piezoelectric materials . The developed copolyimide shows outstanding piezoelectricity reliability, benefiting from the semicrystallinity of the resulting copolyimide at room temperature. A maximum output voltage of about 219 mV can be instantaneously obtained once a tiny periodical force is loaded on the copolyimide based piezoelectric nanogenerator (PENG). Meanwhile, an output power of about 1.17 mW can be reached for the developed PENG, implying large potential application in the sectors of smart tactile devices, electronic skins, and self-powered biomedical nanorobots etc.
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高影响因子
LANGMUIR
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2019
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IF 3.683
Yunrui Han,Shipeng Wang,Rifeng Zhou,Limin He,Xiaoming Luo
In this article, the rising trajectories of oil droplets near the substrates of small channels in the laminar flow field were observed using a high-speed camera. Chemical modifications were made on the surfaces of the brass sheets to change the surface properties, and the controllable regulation of the superoleophilic–superoleophobic wettability gradient was achieved. The adhesion behaviors of the oil droplets on surfaces with different wettabilities at different flow velocities were observed as well. According to the adhesion behaviors of oil droplets on surfaces with different wettabilities, a mathematical model was established to analyze water film thinning and the adherence of oil droplets on the wall in the laminar flow field. Then the quantitative relationships among the adhesion times tf of oil droplets on different wetting surfaces, oil and water properties, and surface wettability were acquired.
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PubMed
高影响因子
CELLULOSE
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2019
·Vol. 26
·期 4
·2861-2872
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IF 3.917
Cheng Quan-Yong,Guan Cheng-Shu,Li Yi-Dong,Zhu Jiang,Zeng Jian-Bing
Traditional superhydrophobic cotton fabrics (CF) demonstrate various advantages such as self-cleaning, water repelling and efficient oil/water separation capacity but limited practical applications due to their poor mechanical robustness and environmental durability. In this work, robust and durable superhydrophobic polydivinylbenzene (PDVB) coated CF (PDVB@CF) are fabricated via a simple one-step, fluorine-free, and inorganic nanoparticle-free solvothermal method. The PDVB@CF displays excellent chemical resistance without losing superhydrophobicity after immersing in various organic solvents, strong acid and alkali solutions for a long time. The PDVB@CF shows excellent mechanical robustness to resist sandpaper abrasion and ultrasonication treatment. Furthermore, the PDVB@CF exhibits outstanding high and low temperature resistances since the contact angle of either acidic or alkali droplets is greater than 150° after isothermal treatment at 200 °C or immersion in liquid nitrogen for 3 h. The PDVB@CF is very efficient in separating water mixtures with various oily compounds with separation efficiency of higher than 98% and flux up to 56 k L m −2 h −1 depending on characteristics of the oils. In addition, the PDVB@CF shows excellent recyclability with superhydrophobicity and separation efficiency that remained after 10 separation cycles. The PDVB@CF with excellent robustness and durability exhibits potential utility in oil/water separation even under some harsh conditions.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2019
·Vol. 99
·期 7
·3548-3554
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IF 2.422
Wen Nie,Kezhou Cai,Yuzhu Li,Zehui Tu,Bing Hu,Cunliu Zhou,Conggui Chen,Shaotong Jiang
BACKGROUND The characteristics of carcinogenic polycyclic aromatic hydrocarbons (PAHs) produced from various fatty acids, as important components of fats and oils, at high temperature are still little known. The reason is because the existing data are from experiments conducted in complex food systems. In this study, 12 PAHs produced from nine fatty acids, representing saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs), were investigated in a model system heated at 98, 165 and 240 °C. RESULTS SFAs can with difficulty be pyrolyzed to generate PAHs at 98 °C, but small amounts of PAHs were determined in MUFAs (44.97 µg kg −1 ) and PUFAs (177.73 µg kg −1 ). When the temperature reached 165 °C, there were totals of 27.59, 142.8 and 449.68 µg kg −1 PAHs assayed in SFAs, MUFAs and PUFAs, respectively. The amounts of PAHs generated from SFAs, MUFAs and PUFAs at 240 °C were higher when compared with those of the 165 °C group ( P < 0.05). With an increase of heating temperature, the proportion of PAHs with four to five rings increased. Under the same heating conditions, the concentration of PAHs in fatty acids increased with an increase in the number of double bonds. CONCLUSIONS More PAHs, especially carcinogenic ones with four to five rings, will be produced in fatty acids heated at higher temperature. The content of PAHs generated from fatty acids increased with an increase in the number of double bonds. This study will increase the understanding of the production characteristics of PAHs from various fatty acids under heating condition. © 2019 Society of Chemical Industry
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POLYMERS FOR ADVANCED TECHNOLOGIES
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2019
·Vol. 30
·期 5
·1226-1233
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IF 2.162
Mingshuai Fan,Yongjie Zhang,Xiaopei Li,Beidi Zeng,Shangtao Chen,Wenqin Zhu,Shuwei Wang,Jing Xu,Na Feng
It is of great significance to synthesize polyolefin/polysiloxane hybrid materials due to their unique combination of crystalline polyolefin segments and semiorganic polysiloxane segments. Herein, we report the syntheses of a novel polypropylene/polydimethylsiloxane (PP -g- PDMS) graft copolymer via the coupling reactions between maleic anhydride-grafted PP and monoaminopropyl-terminated PDMS. The chemical structures of PP -g- PDMS have been characterized by Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), and gel permeation chromatography (GPC). The correlation between reaction conditions and the structural parameters of PP -g- PDMS has been established. Consequently, the potential applications of resultant PP -g- PDMS were investigated, and the results showed that PP -g- PDMS can serve as an efficient compatibilizer in heterogeneous PP/PDMS blend system and also as an ideal processing aid for high-viscosity PP.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Xiaoming Luo,Haoran Yin,Jing Ren,Haipeng Yan,Xin Huang,Donghai Yang,Limin He
The mixing of binary droplets is of paramount importance in microfluidic systems. In order to reveal the mixing mechanism of two free droplets suspended in the immiscible phase, we have developed a novel experimental setup to study the internal mixing in coalescing droplets with varying interfacial tension differences and droplet sizes. It is confirmed that the interfacial energy of droplets supports the jet flow and liquid bridge expansion during the coalescence of droplets. The increase of interfacial tension difference can increase the intensity of jet flow accompanied with slower liquid bridge expansion, which enhances the mixing of droplets. The decrease of droplet size can increase the initial velocity of jet flow. However, the intensity of jet flow decreases due to the rapid expansion of the liquid bridge, which results in weaker internal mixing. On this basis, a Reynolds number incorporating the jet velocity and droplet size is proposed to characterize the vortex size, which represents the degree of droplet mixing. This study presents an effective approach for enhancing the mixing of droplets.
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高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Yanni Yu,Biyu Jin,Muhammad Imran Jamil,Dangguo Cheng,Qinghua Zhang,Xiaoli Zhan,Fengqiu Chen
Various organogel materials with either a liquid or solid surface layer have recently been designed and prepared. In this work, amphiphilic organogels (AmOG) are innovatively developed from copolymer P(PDMS-r-PEG-r-GMA) and 2,2′-diaminodiphenyldisulfide via epoxy group addition reaction and then infiltrated with amphiphilic lubricants instead of traditional hydrophilic or hydrophobic lubricants. Because of synergistic effects of hydrophilic and hydrophobic segments of amphiphilic lubricants, the AmOG surfaces showed high stability and excellent anti-icing performance. The delay in the freezing point of water was 1000 s on AmOG surfaces, which is 40 times longer as compared to the untreated hydrophilic glass surface. More importantly, low ice adhesion strength (15.1 kPa) was observed on AmOG which remained about 40 kPa even after 20 icing–deicing cycles. The novel amphiphilic organogels provide a new idea to prepare long-term anti-icing materials for practical applications.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Jingcheng Du,Changyuan Zhang,Hong Pu,Yufeng Li,Saimeng Jin,Luxi Tan,Cailong Zhou,Lichun Dong
Oil/water separation is an urgent topic because the frequently occurred oil leakages and increasing discharge of oily wastewater. The 3D metal foams with special wettabilities are promising oil/water separation materials owing to their outstanding properties. Herein, we fabricated a HKUST-1 MOFs decorated copper foam using a facile template-sacrificial method for oil/water separation. The as-prepared copper foam possessed good superhydrophobicity under broad pH and saline conditions. Its oil adsorption capability was larger than 150% for all the chosen oils and the oil/water separation efficiency of the foam for various oil/water mixture was larger than 96%. Furthermore, although the wettability decreased to hydrophobic state after 30 cycles of mechanical abrasion, the separation efficiency of the foam kept above 97%, showing good repeatability. Results demonstrated that the distinctive 3D structure of copper foam contributed the excellent durability to mechanical abrasion.
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高影响因子
LANGMUIR
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2019
·
IF 3.683
Dong Zhang,Yuzheng Xia,Xiaonong Chen,Shuxian Shi,Lei Lei
Advanced liquid-repelling materials that resist both water-based and oil-based contaminants have significant applications in many fields. Herein, a novel protocol for the fabrication of a robust poly(high internal phase emulsion) (polyHIPE)-based slippery liquid-infused porous surface (SLIPS) system with combined self-repairing and self-cleaning properties is developed. Specifically, polystyrene-based polyHIPE (PS-HIPE) membranes with an interconnected porous structure were prepared from polymerization of the continuous oil phase in the water-in-oil HIPE templates. These polyHIPE membranes were used, for the first time, as porous substrates for loading low surface tension silicone oils as lubricating liquids for the fabrication of polyHIPE-based SLIPS membranes. These polyHIPE-based SLIPS membranes could easily repel both water- and oil-based contaminants (e.g., ink, milk, and coffee) with very low sliding angles (3.0 ? 1.3?) and could even repel solid contaminants (e.g., dust) upon washing with water. Meanwhile, such membranes exhibit excellent self-repairing properties so that physical scratching damage, such as cutting a trench, does not affect the liquid-repelling performance. The liquid-repelling ability could be recovered completely within 10 s. More significantly, such a SLIPS membrane shows excellent durability so that the water sliding angle of the SLIPS could be maintained at less than 5.0? for about 80 cycles owing to the regenerated poly(dimethylsiloxane) layer on the surface. This work represents a robust methodology to enrich the development of hydrophobic and oleophobic slippery surfaces, which is promising for many areas, such as biomedical, self-cleaning, antifouling, and self-repairing materials.
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高影响因子
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
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2019
·
IF 2.829
Xin Huang,Limin He,Xiaoming Luo,Haoran Yin,Donghai Yang
Deformation and coalescence behaviors of water droplets in viscous fluid under a direct current electric field are investigated with experiments and numerical simulations. An electro-hydrodynamic model is developed based on fluid dynamics equations and electrostatic equations. A coupled level set and volume of fluid method is proposed to capture the dynamic interface. The numerical results are validated to be in good accordance with classic results in the literature. The effects of electric capillary number Ca and viscosity ratio λ on droplet deformation and coalescence are systematically analyzed. Two different droplet response modes are obtained, namely overdamping response and underdamping response. The conversion of response modes is discussed with the ( Ca, λ ) phase diagram. Moreover, the distributions of electric field and flow field before and after the droplets contact are compared and analyzed. Numerical results show the time evolution of liquid bridge is dominated by the interfacial tension and viscosity of continuous phase. The electric stress is extremely weak at the liquid bridge and has a slight influence on evolution of liquid bridge. The correlation formula between dimensionless liquid bridge radius and conical angle during the growth of liquid bridge is regressed. These results are helpful for the optimization of electro-coalescence process.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Jiang Hu,Jundong Zhu,Chongwen Jiang,Tianyu Guo,Quzhi Song,Le Xie
Herein, a stable three-dimensional composite sponge with magnetic and superhydrophobic was prepared via a two-step process including self-polymerization of dopamine (DA) and anchoring of Fe 3 O 4 particles assisted by polydopamine (PDA) and polydimethylsiloxane (PDMS). The modified sponge exhibited high adsorption capacity (52.39–91.52 g/g) for diverse oils and organic solvents , which can be easily recovered in oil-water mixture under magnetism . The excellent properties were attributed to the synergistic effect of micro-nano structures and low surface energy, which were derived from the coatings of PDA and Fe 3 O 4 and hydrophobic methyl groups of PDMS, respectively. When the temperature of PDA coating was 40 °C, the water contact angle (WCA) of the prepared superhydrophobic sponge reached 152.74 ± 0.2°. More importantly, the present adsorbents possessed robust chemical, mechanical, and temperature stability at a harsh environmental and good reusability for oil-water separation after 12 cycles of repeated adsorption, which enable to deal with oil leakage under harsh conditions still maintaining the excellent performance.
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ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Quan-Yong Cheng,Xiao-Li Zhao,Yun-Xuan Weng,Yi-Dong Li,Jian-Bing Zeng
Traditional superhydrophobic materials for oil/water separation not only depend on nonrenewable feedstocks but also lead to secondary environmental pollutions after discarding, due to the presence of inorganic nanoparticles and toxic fluorine-containing chemicals. Herein, we report a fully sustainable, nanoparticle-free, and fluorine-free superhydrophobic cotton fabric (CF) fabricated via an eco-friendly method, that is, roughness creation by enzyme etching followed by surface coating with an epoxidized soybean oil thermoset and subsequent low surface energy modification with stearic acid. The superhydrophobic CF exhibited excellent durability with surface superhydrophobicity surviving from mechanical abrasion, tape peeling, ultrasonication, chemical resistance, and low/high temperature treatment, due to the enzyme etching-induced stable surface structure with covalently linked low-energy substance. The superhydrophobic CF showed excellent oil/water separation performance with a high separation efficiency and high oil flux. With outstanding mechanical robustness, chemical and environmental resistances, and excellent oil/water separation performance, the fully sustainable superhydrophobic CF can be applied as an environmentally friendly substitute to nonrenewable and harmful chemicals containing oil/water separation materials.
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高影响因子
危险品化学品经营许可证（带存储）