科创中国

A mechanical robust and thermal tolerant nanofibrous membrane with hydrophilicity is presented by one step via electrospinning Nomex® solution. The nanofibrous membrane shows a high specific surface area of 21.46 m ²/g, two orders of magnitude larger than that of the commercial Nomex® fibers. The experimental results demonstrate that the membrane has high efficient rejection for nanoparticles from aqueous solution, which reveals its feasibility used in liquid filtration. Additionally, the membrane displays high break strength of 31.34 MPa as well as very excellent thermal resistance, making it as good candidates for applications in reinforced nanomaterials, automobile air filters, template of structure coatings etc., requiring high strength and high thermal resistance.

Jinyou Lin;彬 丁;Jianmao Yang;建勇 俞;Salem S. Al-Deyab

Materials Letters

2012-2-15

Novel flexible, thermally stable and hierarchical porous silica nanofibrous membranes with superhydrophilicity and underwater superoleophobicity were prepared by a facile in situ synthesis method, which can effectively separate oil-in-water microemulsions solely driven by gravity, with an extremely high flux of 2237 L m^-2 h^-1.

Shan Yang;Yang Si;Qiuxia Fu;Feifei Hong;建勇 俞;Salem S. Al-Deyab;Mohamed El-Newehy;彬 丁

Nanoscale

2014-11-7

The separation of oil and water is a worldwide challenge due to the ever-increasing amount of oily industrial wastewater and polluted oceanic waters, as well as the increasing frequency of oil spill accidents. As the leader of advanced fibrous materials, electrospun nanofibers combine the properties of tunable wettability, large surface area, high porosity, good connectivity, fine flexibility, and ease of scalable synthesis from various materials (polymer, ceramic, carbon, etc.), and they hold great potential for many emerging environmental applications, including the separation of oily wastewater. In this review, the recent progress in the design and fabrication of electrospun nanofibrous materials with tunable surface wettability for oil/water separation applications is summarized and highlighted. This review covers the research and development starting from the design concepts and the synthesis of nanofibrous sorbents, nanofibrous membranes, and nanofibrous aerogels for effective oil/water separation. The review concludes with a brief forecast of challenges and future directions in this rapidly expanding field.

Xianfeng Wang;建勇 俞;Gang Sun;彬 丁

Materials Today

2016-9-1

Organic/inorganic hybrid nanofiber systems have generated great interest in the area of tissue engineering and drug delivery. In this study, halloysite nanotube (HNT)-doped poly(lactic-co-glycolic acid) (PLGA) composite nanofibers were fabricated via electrospinning and the influence of the incorporation of HNTs within PLGA nanofibers on their in vitro biocompatibility was investigated. The morphology, mechanical and thermal properties of the composite nanofibers were characterized by scanning electron microscopy (SEM), tensile test, differential scanning calorimetry and thermogravimetric analysis. The adhesion and proliferation of mouse fibroblast cells cultured on both PLGA and HNT-doped PLGA fibrous scaffolds were compared through 3-(4,5-dimethylthiazol-2-yl)-2,5- diphenyl tetrazolium bromide assay of cell viability and SEM observation of cell morphology. We show that the morphology of the PLGA nanofibers does not appreciably change with the incorporation of HNTs, except that the mean diameter of the fibers increased with the increase of HNT incorporation in the composite. More importantly, the mechanical properties of the nanofibers were greatly improved. Similar to electrospun PLGA nanofibers, HNT-doped PLGA nanofibers were able to promote cell attachment and proliferation, suggesting that the incorporation of HNTs within PLGA nanofibers does not compromise the biocompatibility of the PLGA nanofibers. In addition, we show that HNT-doped PLGA scaffolds allow more protein adsorption than those without HNTs, which may provide sufficient nutrition for cell growth and proliferation. The developed electrospun HNT-doped composite fibrous scaffold may find applications in tissue engineering and pharmaceutical sciences.

Ruiling Qi;Xueyan Cao;Mingwu Shen;Rui Guo;建勇 俞;Xiangyang Shi

Journal of Biomaterials Science, Polymer Edition

2012

Effective degradation of organic pollutants in wastewater is of great importance to the environment and human society. TiO2-based electrospun nanofibrous materials combining the properties of the large specific surface area, high aspect ratio, tunable compositions and structures, as well as easy to recycle, show great promise for the efficient removal of organic pollutants. In this Prospective paper, the recent progress in the degradation of organic water contaminants over visible-light-responsive TiO2-based nanofibrous materials is summarized, with emphasis on the strategies for improving the visible-light photocatalytic activity of TiO2-based nanofibrous materials. Finally, the current challenges and future outlook in this field are discussed.

Xiaohui Wu;Yang Si;建勇 俞;彬 丁

MRS Communications

2018-9-1

In this paper, a super-hydrophobic cotton fabric was fabricated by low-pressure plasma-enhanced chemical vapor enhanced deposition (LP-PECVD) with lauryl methacrylate (LMA) as the functional monomer. Scanning electron microscopy (SEM), atomic force microscope (AFM) and X-ray photoelectron spectroscopy were used to analyze the changes of surface morphology and chemical composition of the cotton fabrics surface, respectively. A randomly wrinkled morphology was exhibited by SEM and AFM. The combination of the low surface energy film of LMA and micro-nano-scale structure resulted in the super-hydrophobicity of modified cotton fabrics. The reactive species in LMA/Ar plasma were studied by optical emission spectroscopy, and based on the results of the test, the reaction principle in the plasma reaction chamber was discussed. It was proved that the LMA film is polymerized by chemical bonds on the surface of cotton fibers. The water repellency, washing stability, water-vapor transmission, air permeability and tensile property of fabrics were also discussed. We found that a washing-stable and breathable super-hydrophobic cotton fabric can be achieved after treatment without decreasing the tensile property.

Liyun Xu;Jiawen Deng;Ying Guo;Wei Wang;Ruiyun Zhang;建勇 俞

Textile Reseach Journal

2019-5-1

In this study, we have fabricated the polyacrylonitrile (PAN) reinforced super-hydrophobic fibrous polystyrene (PS) mats via a multi-syringe electrospinning technique. The composition ratio of PS/PAN in the blend mats could be controlled by tuning the number ratios of syringes of PS/PAN. The water contact angles (WCAs) of resultant fibrous mats was decreased from 155° to 143° with the decreasing the number ratios of syringes of PS/PAN from 4/0 to 1/3. The addition of the component of PAN nanofibers in fibrous PS mats significantly improved the mechanical properties of PS mats. At a critical syringe ratio of 3/1 (PS/PAN), the mat surface showed a WCA of 150° with a three times increased tensile strength compared with the pure PS mats. Additionally, the results of field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR), and mechanical properties indicated the multi-syringe electrospinning technique is an effective approach to fabricate the large-scale well-dispersed blend fibrous mats.

Min Sun;孝红 李;彬 丁;建勇 俞;Gang Sun

Journal of Colloid and Interface Science

2010-7

The dissolution of cellulose in another novel solvent, namely, LiOH/thiourea/urea aqueous solution, and its processing by wet spinning was investigated so as to study the morphology, structure, and properties of the resultant cellulose. The process of dissolution that was observed using a polarized optical microscope revealed that the swelling happens to the cellulose at dissolution time of 30 seconds. It also exhibited the change of cellulose diameter against the reduction of the manufacture period of the regenerated cellulose fiber. The cross section of these fibers was found to be different from that of the viscose rayon, which can be explained by the transition of the viscose solution into the rayon. The improved mechanical properties can attribute to the high molecular weight, high degree of crystallinity, and direct dissolution process. The innovative technology with low-cost proved to be environmentally friendly, promising to substitute for viscose process.

Shuai Zhang;Fa Xue Li;建勇 俞

Chemical Fibers International

2009

A facile route of ‘copolymerization/blending' was proposed to fabricate silicon/nitrogen synergistically reinforced flame-retardant PA6 nanocomposites with simultaneously improved anti-dripping and mechanical properties. Firstly, a persistently inherent flame-retardant PA6 (FR-PA6), with 1,3-bis(3-aminopropyl)tetramethyl disiloxane (MSDS), was synthesized via controllable amidation and a polycondensation reaction. Melamine cyanurate (MCA) nanoparticles as a ‘gas phase' synergistic agent were then added into FR-PA6 to further improve its flame retardancy. The primarily obtained FR-PA6 could be extinguished after a few melt droplets dropped as ignited, and passed the V-2 rating with enhanced mechanical properties, while PA6 had no rating (NR). The prepared FR-PA6/MCA nanocomposites could attain a limiting oxygen index (LOI) value of 32.7%, and passed the V-0 level with only 1 melting droplet with similar mechanical properties to PA6. Accordingly, the special ‘condensed-gas phase' synergistic flame-retardant mechanism of FR-PA6/MCA nanocomposites was proposed through studying the residues and pyrolysis volatiles. This work provided a facile route as a model for developing functional PA6 for diverse engineering applications.

Shuo Fan;Ruchao Yuan;Dequn Wu;Xueli Wang;建勇 俞;Faxue Li

RSC Advances

2019

Akund fiber is a new type of natural cellulose fiber. Because of its excellent properties, akund fiber has become one of the new ecological materials which have huge development potential. Recently natural fibers have shown great promise in a variety of applications that were previously dominated by synthetic fibers due to their important aspects of biocompatibility, possible biodegradation, nontoxicity, and abundance. Moisture absorption and release behaviour of natural fiber plastic composites is one major concern in their outdoor applications. So the knowledge of the moisture content and the moisture absorption and release rate is very much essential for the application of akund fiber as an excellent reinforcement in polymers. An effort has been made to study the moisture absorption and release behaviour of akund fiber and the mechanical performance of it at relative air humidity from 0% to 100%. The gain and loss in moisture content in akund fiber due to water absorption and release were measured as a function of exposure time under the environment, in which temperature is 20°C and humidity is 65%. The regression equations of the absorption and release process were established.

Xue Yang;Liqian Huang;隆棣 程;建勇 俞

Advances in Mechanical Engineering

2012