JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2018
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IF 3.046
Junzhang Wang,Mingxiu Fan,Xiufang Bian,Mengchun Yu,Tianqi Wang,Shuai Liu,Yinghui Yang,Yuan Tian,Rongzhang Guan
Magnetic heating and thermal conductivity of magnetic nanofluids (MNFs) are of great interest for biomedicine and electronic heat transfer. Here, we report the enhanced magnetic heating efficiency and thermal conductivity of MNFs fabricated by amorphous FeZrB nanoparticles with high saturation magnetization and good magnetothermal stability. Under external magnetic fields, the viscosities of FeZrB MNFs are almost twice that of Fe 3 O 4 MNFs, enhancing the field-driving force in heat transfer applications. Under 250 Oe alternating current fields, the required time of heating FeZrB MNFs to the hyperthermic temperature (45 °C) is only 16.5% that of Fe 3 O 4 MNFs, amplifying the specific absorption rate of the magnetic nanoparticles by about 2.4 times. Benefiting from the higher thermal conductivity of amorphous, the thermal conductivity enhancement for FeZrB MNFs is also larger than that of Fe 3 O 4 MNFs—up to 34.0% enhancement for silicone oil-based FeZrB MNF at φ = 2 vol%. This investigation of amorphous-nanoparticle-including MNFs shall shed light on the potential of utilizing amorphous nanoparticles to fabricate MNFs for biomedicine or heat management applications.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Qian Wei,Oluwasola Oribayo,Xianshe Feng,Garry L. Rempel,Qinmin Pan
Sponge-like superhydrophobic and superoleophilic materials are attracting significant attention for effective cleanup and recovery of spilled oils from water. We report on the synthesis of TiO2 nanoparticle/polyurethane (TPU) composite foam substrate and its surface modification with tetradecylamine (TDA)-amidated graphene oxide (GO-TDA), thereby forming superhydrophobic and superoleophilic TPU-GO-TDA sorbent for oil spill clean-ups. Spectroscopic analyses confirmed that TDA was successfully grafted onto GO and the reduced GO by TDA was successfully grafted onto the TPU foam. Sorption experiments with engine oil, crude oil, silicone oil, and chloroform demonstrated that the TPU-GO-TDA foam was an effective sorbent with sorption capacity of 20.2–62.4 times its own weight. The absorbed oils in the sorbent could be recovered simply by squeezing the oil-laden foam. The much higher selectivity to oils and better reusability of the TPU-GO-TDA foam than commercial sorbents make the TPU-GO-TDA foam promising for the separation and recovery of spilled oils and organic solvents from water.
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TALANTA
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2018
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IF 4.244
Fan Luo,Bin Zhao,Fei Feng,Lei Hou,Wenbin You,Pengcheng Xu,Haimei Zhou,Xinxin Li
In this paper, a novel and facile way to improve the separation of micro gas chromatographic column is presented which utilizes the mesoporous silica thin film as the stationary phase support. A serpentine semi-packed column is fabricated based on a micro-electro-mechanical system (MEMS) technology and polydimethylsiloxane is used as the stationary phase. The chromatographic resolution of C6-C7 increases from unseparated to 7.44 after depositing mesoporous silica thin film as the stationary phase support in the separation of a mixture of heavy hydrocarbons (C6-C10), and the separation efficiency is as high as 9290 plates/m. Meanwhile, in the separation of a mixture of benzene series (gas mixtures of benzene, toluene and paraxylene), the chromatographic resolution of benzene and toluene can also be increased by 483%. Those outstanding results indicate that using the mesoporous silica as the stationary phase support is an effective way to improve the separation efficiency of the gas chromatographic column.
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Journal of Materials Chemistry B
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2018
·Vol. 6
·期 29
·4799-4807
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IF 4.776
Wenxiang Li,Ruyan Feng,Rensheng Wang,Dan Li,Wenwen Jiang,Hanzhou Liu,Zhenzhong Guo,Michael J. Serpe,Liang Hu
Physically crosslinked hydrogels were synthesized by copolymerization of acrylamide and acrylic acid monomers in the presence of cationic polyelectrolyte polydimethyldiallylammonium chloride. The fully physically crosslinked hydrogel showed good mechanical properties and good adhesion with a variety of substrates. These advantages can be attributed to the homogeneous distribution of crosslinking points due to hierarchical hydrogen bonds and electrostatic attractions in the hydrogel networks. Furthermore, these non-covalent bonds provided an effective pathway to dissipate energy. The mechanical properties of the hydrogels can be easily tuned by changing the chemical composition and ratio of monomers. We further showed that the transparent hydrogels were cytocompatible, and can be used for biomedical applications, including pH-triggered small molecule delivery and hydrogel-based hybrids for detecting doses of radiotherapy.
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高影响因子
Polymers
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2018
·Vol. 10
·期 10
·1101
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IF 2.935
Qiancheng Xiong,Qiuhong Bai,Cong Li,Huan Lei,Chaoyun Liu,Yehua Shen,Hiroshi Uyama
Ecological and environmental damage caused by oil spillage has attracted great attention. Used cigarette filters (CF) have also caused negative environmental consequences. Converting CF to economical materials is a feasible way to address these problems. In this study, we demonstrate a simple method for production of a highly hydrophobic absorbent from CF. CF was modified by using different volume ratios of octadecyltrichlorosilane and methyltrimethoxysilane. When the volume ratio was 3:2, the modified CF had the high water contact angle of 155°. It could selectively and completely absorb silicone oil from an oil-water mixture and showed a good absorption capacity of 38.3g/g. The absorbed oil was readily and rapidly recovered by simple mechanical squeezing, and it could be reused immediately without any additional treatments. The as-obtained superhydrophobic modified CF retained an absorption capacity of 80% for pump oil and 82% for silicone oil after 10 cycles. The modified CF showed good elasticity in the test of repeated use. The present study provides novel design of a functional material for development of hydrophobic absorbents from used CF via a facile method toward oil spillage cleanup, as well as a new recycling method of CF to alleviate environmental impacts.Keywords:cigarette filter;superhydrophobic;highly selective;absorbent;oil spillage
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JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Wenjing Ma,Mengjie Zhang,Zhongche Liu,Mengmeng Kang,Chaobo Huang,Guodong Fu
Developing an effective and energy-efficient oil-water separation technologies for cleaning up or removing of oil contaminants from oily water is highly desired, owing to the frequent occurrence of oil spill accidents and large amounts of oil-containing industrial wastewater emissions. Here, a facile method to fabricate superhydrophobic/superoleophilic membranes based on a fluorine-free system by the combination of electrospun polyimide (PI) nanofibers and a novel in-situ polymerized polybenzoxazine (PBZ) functional containing silica nanoparticles (SNP) is proposed. The resultant PI-based membrane has outstanding superhydrophobicity and superoleophilicity with water and oil contact angles above 154° and approaches 0 °, respectively. Simultaneously, the membrane possesses extraordinary chemical and thermal stability and high salt tolerance. Furthermore, the membrane presents high separation efficiency (above 99%) and high-flux (4798 L m −2 h −1 ) as well as good reusability and oil content in the filtrate below 5 ppm for separation of various oil/water mixture. Significantly, these studies offer a simple yet cost-effective technique to fabricate superhydrophobic/superoleophilic membranes and have potential use for oily wastewater treatment and oil spill clean-up.
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ANALYTICAL CHEMISTRY
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2018
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IF 6.042
Ke Yang,Xiang Yang,Xiang Zhao,Marc Lamy de la Chapelle,Weiling Fu
Simple, rapid, and efficient cell viability assays play a fundamental role in much of biomedical research, including cell toxicology investigations and antitumor drug screening. Here, we demonstrate for the first time a rapid and label-free cell viability assay using THz spectroscopy in combination with a new optical clearing agent (OCA) and microfluidic technology. This strategy uses a considerably less absorptive OCA to replace the highly absorptive water molecules around the living cells and thus to decrease the background signal interference. Three low-viscosity oils were screened as potential OCA candidates, among which fluorinated oil was selected because of its lower absorption and lowest cytotoxicity. After the liquid medium was replaced with fluorinated oil in a microfluidic chip, an obvious THz spectral difference was observed between the fluorinated oils with and without living cells. This change in THz response was preliminarily attributed to the distinguishable signals between the cells and the fluorinated oil. In addition, we applied this method to cell viability assays of human breast cancer cells (MDA-MB-231) after treatment with different antitumor drugs. The results indicated that THz spectroscopy with the aid of the proposed water-replacement strategy presented excellent quantification of cell viability with the advantages of a rapid, label-free, nondestructive microassay, which offers significant potential to developing a convenient and practical cell analysis platform.
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Journal of Physical Chemistry C
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2018
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IF 4.484
Xiaoming Luo,Haoran Yin,Haipeng Yan,Xin Huang,Donghai Yang,Limin He
In this study, the electrocoalescence characteristic of two drops with different surfactant concentrations suspended in oil is revealed. Different from the symmetrical coalescence of identical drops, the asymmetrical liquid bridge is induced by the capillary force, which involves the interfacial tension gradient between the drops. In addition, a mushroom-like jet is formed during asymmetrical coalescence, causing mixing of drops. A characteristic time considering the interfacial tension gradient is proposed to describe the asymmetrical liquid bridge evolution. The mushroom-like jet is found to be driven by the pressure difference between drops, which has a positive correlation with the interfacial tension gradient. Moreover, it is found that the electrocoalescence time is shortened as the interfacial tension increases. This study indicates that increasing the interfacial tension gradient will enhance the jet flow rate and reduce the coalescence time, which is of significance to improve the mixing efficiency of the drops.
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Small
·
2019
·Vol. 15
·期 31
·1901888
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IF 10.856
Bin Shang,Min Chen,Limin Wu
Tunable underwater oil adhesion is a critical issue in interfacial science and industrial applications. Although much progress has been made to date, development of novel smart coating materials that can selectively change the wetting property at different areas is considerably scarce. Here, a simple strategy is proposed to fabricate photothermal responsive coatings, which can change the oil adhesion behavior from low-adhesive rolling state to high-adhesive pinning state for a variety of oily liquids in a remote, local, and reversible manner. Owing to this unique controllability, the adhesion and no-adhesion of oil droplets on the coated surfaces can be easily manipulated by remote and local near-infrared radiation.
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APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Hu Luo,Shaohui Yin,Shuai Huang,Fengjun Chen,Qingchun Tang,Xiaojie Li
Zinc and its alloys are valuable crucial materials applied in the fields of automobile, ship manufacturing and construction industries. However, their application is limited due to poor performance on water-resistance, condensation and anti-icing property. Slippery liquid-infused porous surface (SLIPS) has been widely used owing to excellent water-repellent, condensation and anti-icing properties. In this work, a SLIPS was fabricated based on zinc substrate by using electrochemical etching, low surface energy modification and lubricant infusion, successively. According to the SEM morphologies and EDS images, it could be confirmed that the rough porous surface structure, low surface energy modification and infused lubricants are key factors accounting for the excellent anti-wetting property of fabricated slippery Zn surface. The experimental results showed that the SLIPS on zinc substrate exhibited outstanding water-repellent performance at a wide range of temperature and drop impact velocity. Moreover, its anti-wetting ability can be sustained even under the impacts of droplets or the continuous water jet. Owing to its dropwise condensation strategy, the SLIPS shows reasonable water collection efficiency, which exceeds 60 mg/(cm 2 ·h) at relative humidity of 90%. The excellent anti-icing property is demonstrated by the simulated ice rain test and deicing force test. And the results showed that only tiny residue ice left on the SLIPS and the deicing force was 2–3 times smaller than ordinary surface. The prepared SLIPS is expected to be an adaptable and efficient method for enhancing the water-repellent, condensation and anti-icing properties of zinc substrate, and may expand the application in energy-efficient fluid handing & transportation, medicine and anti-fouling operating in low temperature environment.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2018
·
IF 0.824
Bo-Wen TIAN,Fei FENG,Bin ZHAO,Fan LUO,Xue-Lei YANG,Hai-Mei ZHOU,Xin-Xin LI
A monolithic micro gas chromatography (μGC) chip which integrated the micro separation column (μSC) and the micro thermal conductivity detector (μTCD) based on MEMS (Micro-electro-mechanical systems) technique was fabricated. Compared to the state of the art, the μSC with high depth-to-width ratio channels that was coated with mesoporous silica nanoparticles as stationary phase could effectively improve the column capacity and separation performance. Besides, the stable suspending μTCD, which was designed and fabricated in two ports of the μGC chip, could availably enhance the thermal isolation and reliability of the device. The mixture of light hydrocarbons (methane, ethane, propane and butane) could be separated from each other and detected by this monolithic integrated μGC chip, in which the overall analysis and detection time was only 33 seconds, the separation resolution of ethane and propane was 8.34, and the number of theoretical plate was as high as 11420. The monolithic integrated μGC chip has many advantages such as good separation resolution, high column efficiency and short analysis time, and is suitable for portable gas chromatographic field and onsite detection.
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ACS Nano
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2018
·
IF 13.709
Xin Tang,Liqiu Wang
Manipulation of tiny amounts of liquid is a fundamental technique for miniaturized diagnostic, analyzing, and synthetic processes. Among diverse maneuver methods, light-controlled liquid manipulation stands out because of its ready controllability, high spatial precision, and noncontact feature of light. As light controls the motion of liquid droplets, substantial liquid loss frequently accompanies, leading to reduced sample volume, contaminated devices, and erroneous results. Here, we report a light-controlled droplet-maneuver method based on pyroelectro-trapping on superhydrophobic surfaces. On such a platform, a light source traps and guides the droplet on a nonwetting surface remotely, offering a precise and loss-free droplet transport that eliminates intersample cross-contaminations. Our approach provides a simplified, facile, and compact platform which is suitable for repeated and multistep usages. Droplet-based microreactions and enhanced mixing inside tiny droplets are effectively demonstrated using the platform. The photocontrolled loss-free droplet maneuver is very promising for applications like chemical/bioassays, microfluidics, and liquid transfer.
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