The Experts below are selected from a list of 915 Experts worldwide ranked by ideXlab platform

Chaobo Huang - One of the best experts on this subject based on the ideXlab platform.

  • durable superhydrophobic and superoleophilic Electrospun Nanofibrous Membrane for oil water emulsion separation
    Journal of Colloid and Interface Science, 2018
    Co-Authors: Juntao Zhao, Olayinka Oderinde, Jingquan Han, Zhongche Liu, Buhong Gao, Ranhua Xiong, Qilu Zhang, Shaohua Jiang, Chaobo Huang
    Abstract:

    Marinepollution andindustrial wastewater have caused serious environmental pollution, thereby resulting into an alarming damage to public health in the past decades, hence the high demand for, cost effective, energy-efficient oil-water separation technologies for the removal of oil contaminants from such water. Herein, we report a facile method to fabricate superhydrophobic/superoleophilic Membrane by immersing a polyimide (PI)-based Nanofibrous Membrane into a water/ethanol/ammonia/dopamine mixture, followed by modification with 1H, 1H, 2H, 2H-perfluorodecanethiol (PFDT). The PI-based Membrane exhibited water contact angle (WCA) above 153°, while the oil contact angle (OCA) approached 0°, thereby promoting an outstanding chemical stability which sustained its superhydrophobicity when immersed in aqueous solutions at different pH values. Additionally, the PI-based Membrane possesses ultrahigh flux, high separation efficiency and good reusability in oil-water separation. The aforementioned properties, as well as the easily scale-up preparation process ensure that this promising as-fabricated Membrane can be applied for practical environmental applications including treatment of oily wastewater and oil spillage clean-up.

  • nature inspired creation of a robust free standing Electrospun Nanofibrous Membrane for efficient oil water separation
    Environmental science. Nano, 2018
    Co-Authors: Mengjie Zhang, Zhongche Liu, Chaobo Huang
    Abstract:

    A novel flexible and free-standing Electrospun Fe3+–PA/OTMS/PI Nanofibrous Membrane with superhydrophobicity and superoleophilicity was successfully fabricated by electrospinning assembly in combination with surface modification technology. The as-prepared Membrane exhibited excellent resistance to high temperature, ultraviolet (UV) irradiation, corrosive liquids (such as acidic, basic, and salt solutions) and mechanical abrasion. In addition, the superhydrophobic and superoleophilic Membrane could be efficiently used to separate various oil–water mixtures including dichloromethane (DCM), trichloromethane, dichloroethane, bromobenzene, and carbon tetrachloride. Furthermore, the as-prepared Membrane still possesses a relatively stable and high flux level of 8424 ± 105 L m−2 h−1 after repeated used for twenty separation cycles with the separation efficiency always above 99% and the oil content in the filtrate for all the tested oil–water mixture below 5 ppm. We believe that these as-prepared nanofibers with such excellent performance, are low cost, environmentally friendly, easy to scale up and sustainable, and thereby have the potential to be used in practical applications in the treatment of industrial oily wastewater and oil–water separation.

  • dual ph and ammonia vapor responsive Electrospun Nanofibrous Membranes for oil water separations
    Journal of Membrane Science, 2017
    Co-Authors: Sangram Keshari Samal, Zhongche Liu, Ranhua Xiong, Qilu Zhang, Stefaan C De Smedt, Bharat Bhushan, Chaobo Huang
    Abstract:

    Abstract In the last few years, the amount of industrial oily wastewater discharge and number of oil spill accidents have increased exponentially, spurring the development of highly efficient, cost-effective oil-water separation technologies. In this study, a dual pH- and ammonia-vapor-responsive polyimide (PI)-based Nanofibrous Membrane with high permeate flux and stability was developed for oil-water separations. The Membrane was prepared by successively dip-coating Electrospun PI in decanoic acid (DA)-TiO2 and silica nanoparticles (SNPs). The novel SNP/DA-TiO2/PI Membrane exhibits superhydrophobicity in air and superoleophilicity in neutral aqueous environments (e.g., at pH 6.5). However, the Membrane becomes hydrophilic and superoleophobic in basic aqueous environments (e.g., at pH 12), resulting in only water permeation during oil-water separations. The oil-water separation potential of this innovative dual-responsive Membrane was investigated using several model oil-water mixtures. The Membrane has extremely high flux (6500±100 L m−2 h−1) and separation efficiency (>99%) and is reusable. In addition, thermal stability and abrasion resistance tests show that the Membrane is highly stable under extreme conditions. This dual-responsive Electrospun Nanofibrous Membrane has potential for use in industrial oil-polluted water and oil spill treatment and in systems that require selective oil-water permeation. Furthermore, changes in the surface wettability can also be induced by exposure to ammonia vapor, which might facilitate remote-controlled oil-water separations.

Seeram Ramakrishna - One of the best experts on this subject based on the ideXlab platform.

  • rapid determination of sulfonamide residues in pork by surface modified hydrophilic Electrospun Nanofibrous Membrane solid phase extraction combined with ultra performance liquid chromatography
    Analytical and Bioanalytical Chemistry, 2016
    Co-Authors: Seeram Ramakrishna, Rong Chen, Yingying Yang, Lingling Tian, Weiyang Shen
    Abstract:

    This study aimed to rapidly determine 13 representative sulfonamide (SA) residues in pork by using a surface-modified hydrophilic polystyrene sulfonic acid (PSSA) Electrospun Nanofibrous Membrane as the solid-phase extraction (SPE) pretreatment sorbent, followed by ultra-performance liquid chromatography (UPLC) analysis. The highly hydrophilic nature of PSSA Nanofibrous Membrane created by vacuum plasma treatment was characterized using Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), water contact angle, and X-ray photoelectron spectroscopy (XPS) measurements. In the pretreatment procedures, 13 SA standards, which were spiked in the fatty pork samples, were extracted, enriched, and purified by the SPE procedure based on the principle of ion exchange with the sulfonic groups on the PSSA chains. Under the optimized conditions, the calibration curves of 13 SA compounds showed good linearities with correlation coefficients (r) of more than 0.99 in the range of 50.0-200 μg kg(-1). The mean recoveries of 13 SAs at the spiked concentrations of 50, 100, and 200 μg kg(-1) were in the range of 70.3-92.5 % with average RSDs (n = 6) of less than 15 % (except for sulfacetamide, 56.9-61.6 %). Compared with other pretreatment methods reported previously, less organic solvent (especially without degreasing the extract with n-hexane) was used in this time-saving SPE procedure, which avoids the possibility of emulsification and therefore enhances the recoveries. The developed and validated analysis method was sensitive, accurate, rapid, convenient, environmentally friendly, and was successfully applied for the detection of 13 SA residues in commercially available pork samples.

  • influence of Electrospun fiber size on the separation efficiency of thin film nanofiltration composite Membrane
    Journal of Membrane Science, 2012
    Co-Authors: Subramanian Sundarrajan, Satinderpal Kaur, Dipak Rana, Takeshi Matsuura, Seeram Ramakrishna
    Abstract:

    Abstract Currently, Electrospun Nanofibrous Membrane (ENM) is classified as a microfiltration (MF) Membrane, which upon further modification is used for nanofiltration (NF) applications. The objective of this study was to investigate the suitability of ENM for water treatment applications. Different fiber sizes were obtained by varying the concentration of polyacrylonitrile solution (namely 4, 6, 8 and 10 wt%) to explore the interplay between Electrospun fiber size and rejected salt ions. When the fiber size was larger, its ‘bubble-point’ was higher and hence its pure water flux was also higher. In order to transform these MF Membrane to NF Membrane, an interfacial polymerization technique was used to coat a thin film on the surface of ENM. Separation of 2000 ppm of various salts was conducted on this developed thin film Nanofibrous composite (TFNC) Membrane. The results indicated that as the fiber size decreased, the pore-size also decreased, and the separation of salts increased, while at the expense of flux. When the cross-sectional thickness of the Electrospun layer was decreased together with smaller pore-size, it resulted in the increased flux with high salt rejection. In addition, rejection efficiency of these TFNC Membranes against PEG 300, PEG 600 and PEG 3400 were also studied.

  • hot pressing of Electrospun Membrane composite and its influence on separation performance on thin film composite nanofiltration Membrane
    Desalination, 2011
    Co-Authors: Subramanian Sundarrajan, Satinderpal Kaur, Takeshi Matsuura, R S Barhate, Seeram Ramakrishna
    Abstract:

    Abstract The primary objective of this paper was to investigate the influence of hot pressing on Electrospun Nanofibrous Membrane (ENM) properties and subsequently the separation of salt after interfacial polymerization was carried out on the surface of ENM. Polyacrylonitrile solution was Electrospun on a Hollytex backing material and this composite layer was subsequently subjected to hot pressing at 87 °C at pressures of 0.14, 0.28 or 0.41 MPa. The bubble-point of the hot pressed ENM significantly reduced with increasing pressure. Overlapping fibers fused at 0.28 MPa and over fusing occurred at 0.41 MPa hence accounting for the drastic decrease in bubble-point. In addition, the thickness of the ENM layer decreased with applied pressure as it compressed the ENM layer. A decrease in bubble-point resulted in a drastic decrease in pure water flux. Interfacial polymerization was carried out on the surface of ENM. The interfacial polymerized control was not able to withstand higher pressures. However, with treatment of 0.14 MPa onwards, the composite Membrane was resilient at higher pressure and there wasn't a drastic difference in the average separation of the interfacially polymerized ENM. When compared to NF90, ENM-1 and ENM-2 had fluxes more than 3 folds. However the rejection was compromised by 8–12%.

  • in vitro culture of human dermal fibroblasts on Electrospun polycaprolactone collagen Nanofibrous Membrane
    Artificial Organs, 2006
    Co-Authors: Jayarama Reddy Venugopal, Yanzhong Zhang, Seeram Ramakrishna
    Abstract:

    Novel cost-effective Electrospun Nanofibrous Membrane is established for wound dressing and allogeneic cultured dermal substitute through the cultivation of human dermal fibroblast for skin defects. Synthetic polymers are generally used for tissue engineering and drug delivery applications because of their remarkable mechanical stability and slow degradation. Polycaprolactone (PCL) is used as a bioresorbable polymer in numerous medical devices as well as for tissue engineering applications. The large surface area of the polymer nanofibers with specific modifications facilitates cell adhesion and control of their cellular functions. The objectives of this study was to fabricate Electrospun Nanofibrous Membrane from biodegradable PCL for wound dressing and collagen-blended Nanofibrous Membrane, and to examine fibroblast attachment, cell proliferation, and morphology of cell matrix interaction. Results of the present investigation prove that the porous Nanofibrous Membrane is suitable for wound dressing and modified PCL-blended collagen Nanofibrous Membrane is suitable for the attachment and proliferation of fibroblast, and might have the potential to be applied in tissue engineering as a dermal substitute for the treatment of skin defects and burn wounds.

Narayan Bhattarai - One of the best experts on this subject based on the ideXlab platform.

  • Electrospun Nanofibrous polyurethane Membrane as wound dressing
    Journal of Biomedical Materials Research Part B, 2003
    Co-Authors: Myung-seob Khil, Narayan Bhattarai
    Abstract:

    Produced via electrospinning, polyurethane Membrane, which has a unique property, has been of interest in medical fields. Electrospinning is a process by which nanofibers can be produced by an electrostatically driven jet of polymer solution. Electrospun fibers are collected in the form of Membranes. The porous structured Electrospun Membrane is particularly important for its favorable properties: it exudates fluid from the wound, does not build up under the covering, and does not cause wound desiccation. The Electrospun Nanofibrous Membrane shows controlled evaporative water loss, excellent oxygen permeability, and promoted fluid drainage ability, but still it can inhibit exogenous microorganism invasion because its pores are ultra-fine. Histological examination indicates that the rate of epithelialization is increased and the dermis becomes well organized if wounds are covered with Electrospun Nanofibrous Membrane. This Electrospun Membrane has potential applications for wound dressing based upon its unique properties. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 67B: 675–679, 2003

  • Electrospun Nanofibrous polyurethane Membrane as wound dressing
    Journal of Biomedical Materials Research Part B, 2003
    Co-Authors: Myung-seob Khil, Dongil Cha, Hak Yong Kim, Inshik Kim, Narayan Bhattarai
    Abstract:

    Produced via electrospinning, polyurethane Membrane, which has a unique property, has been of interest in medical fields. Electrospinning is a process by which nanofibers can be produced by an electrostatically driven jet of polymer solution. Electrospun fibers are collected in the form of Membranes. The porous structured Electrospun Membrane is particularly important for its favorable properties: it exudates fluid from the wound, does not build up under the covering, and does not cause wound desiccation. The Electrospun Nanofibrous Membrane shows controlled evaporative water loss, excellent oxygen permeability, and promoted fluid drainage ability, but still it can inhibit exogenous microorganism invasion because its pores are ultra-fine. Histological examination indicates that the rate of epithelialization is increased and the dermis becomes well organized if wounds are covered with Electrospun Nanofibrous Membrane. This Electrospun Membrane has potential applications for wound dressing based upon its unique properties.

Tamer Uyar - One of the best experts on this subject based on the ideXlab platform.

  • fabrication of cellulose acetate polybenzoxazine cross linked Electrospun Nanofibrous Membrane for water treatment
    Carbohydrate Polymers, 2017
    Co-Authors: Yelda Ertas, Tamer Uyar
    Abstract:

    Abstract Herein, polybenzoxazine based cross-linked cellulose acetate Nanofibrous Membrane exhibiting enhanced thermal/mechanical properties and improved adsorption efficiency was successfully produced via electrospinning and thermal curing. Initially, suitable solution composition was determined by varying the amount of the benzoxazine (BA-a) resin, cellulose acetate (CA) and citric acid (CTR) to obtain uniform Nanofibrous Membrane via electrospinning. Subsequently, thermal curing was performed by step-wise at 150, 175, 200 and 225 °C to obtain cross-linked composite Nanofibrous Membranes. SEM images and solubility experiments demonstrated that most favorable result was obtained from the 10% (w/v) CA, 5% (w/v) BA-a and 1% (w/v) CTR composition and cross-linked Nanofibrous Membrane (CA10/PolyBA-a5/CTR1) was obtained after the thermal curing. Chemical structural changes (ring opening) occurred by thermal curing revealed successful cross-linking of BA-a in the composite Nanofibrous Membrane. Thermal, mechanical and adsorption performance of pristine CA and CA10/PolyBA-a5/CTR1 Nanofibrous Membranes were studied. Char yield of the pristine CA Nanofibrous Membrane has increased notably from 12 to 24.7% for composite CA10/PolyBA-a5/CTR1 Membrane. When compared to pristine CA Membrane, CA10/PolyBA-a5/CTR1 Nanofibrous Membrane has shown superior mechanical properties having tensile strength and Young’s modulus of 8.64 ± 0.63 MPa and 213.87 ± 30.79 MPa, respectively. Finally, adsorption performance of pristine CA and CA10/PolyBA-a5/CTR1 Nanofibrous Membranes was examined by a model polycyclic aromatic hydrocarbon (PAH) compound (i.e. phenanthrene) in aqueous solution, in which CA10/PolyBA-a5/CTR1 Nanofibrous Membrane has shown better removal efficiency (98.5%) and adsorption capacity (592 μg/g).

  • flexible and highly stable Electrospun Nanofibrous Membrane incorporating gold nanoclusters as an efficient probe for visual colorimetric detection of hg ii
    Journal of Materials Chemistry, 2014
    Co-Authors: Anitha Senthamizhan, Asli Celebioglu, Tamer Uyar
    Abstract:

    Here, we describe the visual colorimetric detection of Hg2+ based on a flexible fluorescent Electrospun Nanofibrous Membrane (NFM). It is an efficient approach, in which we have effectively integrated fluorescent gold nanoclusters (AuNC) into Electrospun polyvinyl alcohol nanofibers. Interestingly, the resulting composite nanofibers (AuNC*NFM) are shown to retain the fluorescence properties of AuNC and exhibit red fluorescence under UV light, being cogent criteria for the production of a visual colorimetric sensor. Furthermore, capabilities with regard to the stability of the AuNC*NFM have been under observation for a period of six months, with conditions matching those of typical atmosphere, and the resulting outcome has thrown light on their long-term storability and usability. It is clear, from the fact that the Nanofibrous Membrane preserves the fluorescence ability up to a temperature of 100 °C, that temperature does not have an effect on the sensing performance in real-time application. The water-insoluble AuNC*NFM have been successfully tailored by cross-linking with glutaraldehyde vapor. Further, the contact mode approach has been taken into consideration for the visual fluorescent response to Hg2+, and the observed change of color indicates the utility of the composite nanofibers for onsite detection of Hg2+ with a detection limit of 1 ppb. The selectivity of the AuNC*NFM hybrid system has been analyzed by its response to other common toxic metal interferences (Pb2+, Mn2+, Cu2+, Ni2+, Zn2+, Cd2+) in water. Several unique features of the hybrid system have been determined, including high stability, self-standing ability, naked-eye detection, selectivity, reproducibility and easy handling – setting a new trend in Membrane-based sensor systems.

Weizhong Yuan - One of the best experts on this subject based on the ideXlab platform.

  • a superhydrophobic poly lactic acid Electrospun Nanofibrous Membrane surface functionalized with tio2 nanoparticles and methyltrichlorosilane for oil water separation and dye adsorption
    New Journal of Chemistry, 2019
    Co-Authors: Zixuan Zhou, Lejing Liu, Weizhong Yuan
    Abstract:

    A functionalized nanofiber Membrane with high oil/water separation efficiency and methylene blue adsorption has been successfully fabricated by electrospinning and a surface modification approach. The substrate poly(lactic acid) (PLA) nanofiber film was firstly coated with titanium dioxide (TiO2) nanoparticles (NPs) by the sol–gel method. Then, polysiloxane formed by the hydrolysis and polycondensation of methyltrichlorosilane (MTS) was deposited on the modified nanofiber surface to increase the surface roughness and reduce the surface energy. The PLA Nanofibrous Membrane functionalized with TiO2 NPs and MTS exhibited excellent superhydrophobicity (water contact angle = 157.4 ± 0.9°), high permeation flux (2297.6 ± 51.6 L m−2 h−1) and ideal filtration efficiency (98.4 ± 1.0%). Moreover, the functionalized Nanofibrous Membrane could also achieve rapid and recyclable adsorption of toxic dyes such as methylene blue in aqueous solution. It provides a new prospect to facilely fabricate Nanofibrous Membrane materials to achieve the dual functions of oil/water separation and removal of toxic dyes with high efficiency.

  • a hierarchical functionalized biodegradable pla Electrospun Nanofibrous Membrane with superhydrophobicity and antibacterial properties for oil water separation
    New Journal of Chemistry, 2018
    Co-Authors: Lejing Liu, Weizhong Yuan
    Abstract:

    In recent years, the application of superwettability materials in oil/water separation has been developed rapidly. In this work, a hierarchical surface-modified biodegradable Electrospun Nanofibrous poly(lactic acid) (PLA) Membrane was fabricated with the bioinspired coating of polydopamine (PDA), the immobilization of silver nanoparticles (AgNPs) and the subsequent superhydrophobization of the fluorinated thiol as a medium for high-efficient oil/water separation. Due to the synergistic effect of the hierarchical rough structure and the low surface energy chemicals, the as-prepared Membrane exhibited superhydrophobicity (water contact angle = 158.6° ± 1.2°, sliding angle = 2.5° ± 0.2°) and superoleophilicity (oil contact angle = 0°). A high permeation flux (2664.3 ± 48.2 L m−2 h−1) and desirable separation efficiency (98.4 ± 1.0%) were achieved during the gravity-driven oil/water separation. Moreover, the Membrane could separate the water-in-oil emulsion effectively. Furthermore, the stable hydrophobicity and roughness were maintained after 20 cycles of repeated separation, indicating the favorable recyclability. Besides, the Membrane showed extremely low water-adhesion performance, desirable antifouling properties and superior antibacterial properties (antibacterial activity reached 99.0 ± 0.4%), which would make it a promising biodegradable candidate for oily wastewater treatment.