ACS Applied Polymer Materials
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2020
·
IF 0
Yan Fang,Liyu Yan,Haiqing Liu
In this work, hydrophobic sponges for highly efficient oil/water separation and oil absorption were fabricated by a simple, eco-friendly, economical, and scalable dip-coating of hydrophilic melamine sponges in urushiol (a naturally occurring small compound) solution. Because of the unique catechol group and a long alkyl side chain with unsaturated double bonds, urushiol molecules easily adhered on the sponge wall surface and self-polymerized to form a thin hydrophobic coating layer with the assistance of heat treatment. The urushiol-modified melamine sponge (UMS) displayed a water contact angle of ∼139o and a 3D highly porous structure, so it could effectively separate oil from dynamic oil/water mixtures. The separation flux of n-hexane from an n-hexane/water mixture was as high as 18,356 ± 2200 L·m–2·h–1·bar–1. It could quickly absorb various oils and common organic solvents with an absorption capacity of up to 181 g·g–1 and had excellent recyclability. UMS also displayed robust mechanical stability, flexibility, elasticity, and thermal stability. Therefore, the facile preparation process, low cost, and superior oil separation/absorption would endow UMS with high potential when dealing with oily wastewater.
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LANGMUIR
·
2020
·
IF 3.557
Guangyan Wang,Tianyi Zhao,Lie Chen,Kesong Liu,Ruochen Fang,Mingjie Liu
Porous polymers are of great interest in potential energy storage and environmental remediation applications. However, traditional fabrication methods are either time-consuming or energy-consuming and deteriorate the mechanical strength of polymer materials. In this study, polymerization-induced phase separation was used to realize the template-free fabrication of superflexible macroporous polymers. Since the solvent is also used as a porogen, this method can be widely used to synthesize several porous polymers by carefully choosing the solvent and monomer. Compared to nonstructured polymers, the prepared macroporous polymers exhibited enhanced mechanical strength, superflexibility, multicompressibility, and bending properties. Along with hydrophobicity/oleophilicity and macroporous structures, the as-prepared porous polymers demonstrated controllable oil absorbability and release; furthermore, after infusing with lubrication liquid, these materials can be used as antiwaxing materials. The elastic porous polymers prepared using this simple and universal method show great potential for various applications, including controlled drug release, antiwaxing, and lubrication.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Xingxing Ni,Yujie Gao,Xinhai Zhang,Yang Lei,Gang Sun,Bo You
Smart self-healing coatings containing stimuli-responsive materials have attracted tremendous interest recently due to their switchable and desirable functionalities with the changes of external environment. However, the fabrication of most smart self-healing coatings requires complex procedures and/or unfriendly chemicals, and the environmental durability of a coating is still considered as a major factor that influences its large-scale engineering applications. Herein, an eco-friendly smart self-healing coating with near infrared (NIR) and pH dual-responsive superhydrophobic and anti-biofouling properties was fabricated by simply mixing the biomimetic stimuli-responsive mesoporous polydopamine microspheres (polydimethylsiloxane-loaded mesoporous polydopamine microspheres, abbreviated as [email protected] MSPs) with waterborne resin and hydrophobic nanoparticles. The [email protected] MSPs were fabricated through an emulsion-induced interfacial anisotropic assembly strategy, followed by the abundant loading of hydrophobic PDMS. These biocompatible [email protected] MSPs with NIR and pH dual-responsive properties acted as the self-healing agents and green hydrophobic fillers. The [email protected] MSPs also provided source for outfield stimulated response and no additional responsive material was required for the self-healing process. Superhydrophobicity of the coating was achieved with these fluorine-free, non-toxic, and biocompatible materials. When damaged by the external environment, the coating could directly self-heal its superhydrophobicity and active anti-biofouling properties under the NIR or pH stimuli, owing to the release of low-surface-energy PDMS from the [email protected] MSPs. The cytotoxicity of the casting solution for this smart coating and the long-term self-healing superhydrophobicity of the coating in harsh environments, including exposure to UV irradiation and immersion in salt, strong acid, and strong base solutions, were investigated. This smart coating shows great promise for anti-fouling, anti-adhesion, and biomedical applications due to its excellent self-healing and biological properties. The MPDA-based stimuli-responsive microspheres can be extended to other functionalized smart coatings.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Ang Li,Mengqi Zhu,Pengfei Hao,Haihao Wu,Jing Gong,Kun Wang,Weichao Yu,Yaorong Feng
To inhibit wall sticking during gathering of high water cut crude oil, based on the deposition characteristics of the complexes by reaction of phytic acid (PA) with ferric chloride (FC), a simple and environmentally friendly method for carbon steel plate modification was adopted in this study. The effects of reaction time, FC concentration, and deposition times on surface wettability and morphology were investigated. It appeared in the results that the wettability of the surface no longer changed after 1 min of reaction. After two times of deposition, the carbon steel exhibited superhydrophilicity in air and superoleophobicity under water, and more pronounced nano-structures were observed. Comparing with similar works, no electroplating, heating and other devices are required during the entire coating process . Moreover, for the sake of clearly explaining the mechanism of wettability conversion during PA-FC modification, the theory of surface energy and adhesion work were used to quantitatively calculate the adhesion strength of oil droplet on solid surfaces . It was found that the hydrophilization and underwater oleophobicization of materials were essentially a process of increasing the polar component of surface energies, and the opposite adhesion state of oil in air and under water was demonstrated theoretically. Finally, the anti-sticking ability at low temperatures of treated carbon steel was evaluated experimentally. The PA-FC coating showed good oil gel prevention performance below the pour point of crude oil. In conclusion, the wall sticking prevention method proposed in our work provides another way for flow assurance of the transportation of high water cut crude oil.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Peng Wan,Xiaobin Gu,Xiaolong Ouyang,Shuyu Shi,Baolin Deng,Jiaqi Liu,Paul K. Chu,Xue-Feng Yu
Water evaporation driven by solar energy is an efficient, renewable, and environmentally friendly method to purify polluted or saline water. However, current solar-powered evaporation systems generally suffer from the poor stability, high materials cost, and complex fabrication processes. In this work, an inexpensive and versatile photothermal membrane (PTM) is prepared with basalt-fibers, which are prepared from natural basalt and synthesized by fiber forming and annealing. Owing to the special chemical composition and physical structure, the basalt-fiber PTM is very robust and corrosion resistant in extreme environments such as a strong acid, organic solvent, and alkali. The water evaporation processes are investigated and the floating-with-insulator mode shows the lowest heat dissipation and highest water evaporation rate. The basalt-fiber fabric is optimized by carbonization and a vaporization rate of 1.50 kg·m −2 ·h −1 and energy utilization efficiency of 82.5% are achieved for evaporation of pure water. The basalt-fiber PTM can be hand washed at least 30 times without efficiency deterioration and the process can be readily scaled up to address commercial needs.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Ran Chen,Junfeng Liu,Xingzheng Wang,Linlin Kong,Leyun Feng,Jingkai Han,Hao Bai,Fubing Bao
Porous membranes are widely used for filtration, especially those with homogenous pore size and strong mechanical strength. Here, we develop a programmable electrospinning system and fabricate porous membranes consisted of orthogonally aligned nanofibers. The porous fibrous membranes possess more homogeneous pore size and stronger mechanical strength when compared to traditional porous membrane with disordered nanofibers. By physically modifying the membrane surface with PTFE nanoparticles, we obtain a filter membrane, which has both large oil contact angle in water and large water contact angle in oil. Synergism between hierarchical structure and surface property realizes a high separation efficiency of both oil-in-water and water-in-oil emulsions. The technique to control the structure of fibrous membrane, combined with the method to modify the surface of nanofibers, provides a great opportunity to design advanced fibrous membrane for various applications.
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高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
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2020
·Vol. 46
·期 7
·6207-6217
·
IF 1.711
Ahmed Numan,Zhang Xianwei,Fahad Shah,Jamil Muhammad Imran,Aziz Tariq,Husamelden E.,Bittencourt Carla,Wan Jintao,Fan Hong
Nanoadditives are promising materials for long-envisioned next-generation lubricants to achieve excellent tribological performance and thermal stability. Here, an instigative and novel approach has been scrutinized to facilely prepare the nanolubricant additive. For this purpose, three synthetic strategies were designed for i) preparation of uniform-sized poly(methyl silsesquioxane) (PMSQ) nanoparticles, ii) hydrosilylation of the long carbon chain of ethyl 10-undecenoate and iii) modification of PMSQ nanoparticles with hydrosilylation product through a condensation reaction, in order to obtain long-carbon-chain grafted nanohybrids. The morphology, composition, and properties of these nanohybrids were confirmed by 1 H-NMR, FTIR, SEM, EDS, and TGA. The effects of different concentrations of unmodified and modified PMSQ nanoparticles on the tribological properties of silicone oil were discussed. In the comparison of unmodified PMSQ nanoparticles, the modified one performs very well to reduce the coefficient of friction and wear scar diameter at low concentration. The TGA results revealed the extraordinary thermal stability of these particles, as their weight loss was only 19% at 800 °C which is remarkably higher than other solid lubricant additives. In this research, we tried to fill the deficiency of thermally stable material in the field of heavy machinery and industry. In addition, the environment-friendly (fluorine-free), superhydrophobic and self-cleaning surface effect of modified PMSQ nanoparticles was also observed. These silsesquioxane-based nanohybrids having synergistic effects, advantageous scientific values, and promising application prospects are expected to be more useful with other longer carbon chains.
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ACS Sensors
·
2020
·
IF 7.333
Jianan Xu,Zhen Zhang,Shiyu Gan,Han Gao,Huijun Kong,Zhongqian Song,Xiaoming Ge,Yu Bao,Li Niu
Wearable potentiometric ion sensors are attracting attention for real-time ion monitoring in biological fluids. One of the key challenges lies in keeping the analytical performances under a stretchable state. Herein, we report a highly stretchable fiber-based ion-selective electrode (ISE) prepared by coating an ion-selective membrane (ISM) on a stretchable gold fiber electrode. The fiber ISE ensures high stretchability up to 200% strain with only 2.1% increase in resistance of the fiber electrode. Owing to a strong attachment between the ISM and gold fiber electrode substrate, the ISE discloses favorable stability and potential repeatability. The Nernst slope of the ion response fluctuates from 59.2 to 57.4 mV/dec between 0 and 200% strain. Minor fluctuation of the intercept (E0) (±4.97 mV) also results. The ISE can endure 1000 cycles at the maximum stretch. Sodium, chloride, and pH fiber sensors were fabricated and integrated into a hairband for real-time analysis of human sweat. The result displays a high accuracy compared with ex situ analysis. The integrated sensors were calibrated before and just after on-body measurements, and they offer reliable results for sweat analysis.
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高影响因子
AICHE JOURNAL
·
2021
·Vol. 67
·期 5
·e17165
·
IF 3.993
Xin Huang,Limin He,Xiaoming Luo,Ke Xu,Yuling Lü,Donghai Yang
The dynamic behaviors of two droplets and droplet cluster under an alternating current (AC) electric field are investigated. Two droplets generally undergo transformation from complete coalescence to partial coalescence and finally to non-coalescence as the electric capillary number Ca p increases. The critical electric capillary number Ca pc for complete coalescence in the AC electric field remains unchanged and is twice as large as that in the direct current (DC) electric field when the frequency f ≥ 250 Hz. Charge transfer and reversal of electric field result in the reversal of the direction of electric force, which is the fundamental mechanism of non-coalescence of two droplets and chain formation in droplet cluster. The number of rebounds dramatically increases as f increases, promoting the stability of droplet chain. The droplet chains in the high-frequency AC electric field are longer and more stable than those in the low-frequency AC electric field.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Yong Xu,Gang Wang,Lijing Zhu,Luli Shen,Zhepeng Zhang,Tianhui Ren,Zhixiang Zeng,Tao Chen,Qunji Xue
Supra-wetting materials, especially superhydrophobic absorption materials , as an emerging advanced oil-water separation material have attracted extensive concern in the treatment of oil spillage and industrial oily wastewater. However, it is still a challenge to fabricate robust and multifunctional superhydrophobic materials for the multitasking oil-water separation and fast clean-up of the viscous crude oil by an environment-friendly and scalable method. Herein, a solid-solid phase ball-milling strategy without chemical reagent-free modification was proposed to construct heterogeneous superhydrophobic composites by using waste soot as the solid-phase superhydrophobic modifier. A series of covalent bond restricted soot-graphene (S-GN) or soot-Fe 3 O 4 (S-Fe 3 O 4 ) composite materials with a peculiar micro-nano structure are prepared. Through "glue+superhydrophobic particles" method, the prepared soot-based composite particles are facilely loaded on the porous skeleton of the sponge to obtain multifunctional superhydrophobic adsorbents. The reported superhydrophobic adsorbents exhibited robust chemical and mechanical stability, convenient magnetic collection, the high oil absorption capacity of 60–142 g g −1 , durable recyclability (>250 cycles), efficient separation efficiency (>99.5%) and outstanding self-heated performance, which enable them to be competent for oil-water separation in multitasking and complex environment (floating oils, continuous oil collection, oil-in-water emulsion, and viscous oil-spills).
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Zhongsheng Ma,Qiangzi Li,Bijia Wang,Xueling Feng,Hong Xu,Zhiping Mao,Chun You,Xiaofeng Sui
Nanocellulose are promising Pickering emulsion stabilizers for being sustainable and non-toxic. In this work, semicrystalline cellulose oligomers (SCCO), which were synthesized from maltodextrin using cellobiose as primer by in vitro enzymatic biosystem, were exploited as stabilizers for oil-in-water Pickering emulsions. At first, the morphology, structure, thermal and rheological properties of SCCO suspensions were characterized, showing that SCCO had a sheet morphology and typical cellulose-Ⅱ structure with 56 % crystallinity. Then the kinetic stabilities of emulsions containing various amounts of SCCO were evaluated against external stress such as pH, ionic strength, and temperature. Noting that SCCO-Pickering emulsions exhibited excellent stabilities against changes in centrifugation, pH, ionic strengths, and temperatures, and it was also kinetically stable for up to 6 months. Both SCCO suspensions and their emulsions exhibited gel-like structures and shear-thinning behaviors. These results demonstrated great potential of SCCO to be applied as nanocellulosic emulsifiers in food, cosmetic and pharmaceutical industries.
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高影响因子
LANGMUIR
·
2021
·
IF 3.882
Dege Li,Yi Cao,Bingfang Huang,Molong Han,Xinlei Wu,Qiang Sun,Chao Zheng,Lilong Zhao,Chi Ma,Hui Jin,Xiaolong Wang,Yonghong Liu,Yanzhen Zhang
The precise and effective generation of micron-sized droplets is one of the most common and important issues for droplet-based microfluidics. Active droplet generation makes use of additional energy input in promoting interfacial instabilities for droplet generation. Here, we report a new technique for the active generation of femtoliter droplets in microfluidic systems using confined interfacial vibration (CIV). The CIV is formed at the orifice of a traditional inkjet nozzle first by pushing the liquid out and then pulling it back. Droplets are pinched off during the withdrawal process, and this is different from the current active droplet generation techniques, which only monodirectionally push the liquid out. Droplets with radius ranging from ca. 1 to 28 μm can be actively generated by CIV at an orifice with radius 30 μm, distinguishing from conventional active generation techniques in which the droplets are always comparable or slightly bigger than the orifice. Experimental results showed that the droplet volume can be customized by controlling the intensity of the CIV. The inherent digital nature of the inkjet technique enables easy and precise regulating of the droplet volume, making it seamlessly compatible with the digital microfluidic systems.
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