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In order to reduce the dependency of resin synthesis on petroleum resources, vanillyl alcohol which is a renewable material that can be produced from lignin has been used to synthesize bioepoxy resin. Although it has been widely reported that the curing reaction and properties of the cured epoxies can be greatly affected by the molecular structure of the curing agents, the exact influence remains unknown for bioepoxies. In this study, four aliphatic amines with different molecular structures and amine functionalities, namely triethylenetetramine (TETA), Tris(2-aminoethyl)amine (TREN), diethylenetriamine (DETA), and ethylenediamine (EDA), were used to cure the synthesized vanillyl alcohol–based bioepoxy resin (VE). The curing reaction of VE and the physicochemical properties, especially the thermomechanical performance of the cured bioepoxies with different amine functionalities, were systematically investigated and compared using different characterization methods, such as DSC, ATR–FTIR, TGA, DMA, and tensile testing, etc. Despite a higher curing temperature needed in the VE–TETA resin system, the cured VE–TETA epoxy showed a better chemical resistance, particularly acidic resistance, as well as a lower swelling ratio than the others. The higher thermal decomposition temperature, storage modulus, and relaxation temperature of VE–TETA epoxy indicated its superior thermal stability and thermomechanical properties. Moreover, the tensile strength of VE cured by TETA was 1.4~2.6 times higher than those of other curing systems. In conclusion, TETA was shown to be the optimum epoxy curing agent for vanillyl alcohol–based bioepoxy resin.
Zhenyu Wang; Pitchaimari Gnanasekar; Sandeep Sudhakaran Nair; Songlin Yi; Ning Yan. Curing Behavior and Thermomechanical Performance of Bioepoxy Resin Synthesized from Vanillyl Alcohol: Effects of the Curing Agent. Polymers 2021, 13, 2891 .
AMA StyleZhenyu Wang, Pitchaimari Gnanasekar, Sandeep Sudhakaran Nair, Songlin Yi, Ning Yan. Curing Behavior and Thermomechanical Performance of Bioepoxy Resin Synthesized from Vanillyl Alcohol: Effects of the Curing Agent. Polymers. 2021; 13 (17):2891.
Chicago/Turabian StyleZhenyu Wang; Pitchaimari Gnanasekar; Sandeep Sudhakaran Nair; Songlin Yi; Ning Yan. 2021. "Curing Behavior and Thermomechanical Performance of Bioepoxy Resin Synthesized from Vanillyl Alcohol: Effects of the Curing Agent." Polymers 13, no. 17: 2891.
Rapid cleanup of crude oil spills is a worldwide challenge because heavy oil components (>103 mPa·s) are difficult for removal by conventional porous oil sorbents due to their inherent high viscosities. In this work, we took advantage of the photothermal effect by using sunlight as the energy source to heat heavy oil components for significantly reducing their viscosities to achieve a fast crude oil cleanup. A carbon nanotube (CNT) modified lignin-based polyurethane foam was fabricated as a photothermal sorbent that exhibited outstanding adsorption capacity for heavy oil. The modified foam achieved nearly full sunlight absorption (97%) with its surface temperature reaching up to 90.3 °C within 500 s owing to the excellent photothermal effect of CNTs. The resulting solar heating effectively reduced the viscosity of the heavy oil, which enabled the modified foam to quickly adsorb more than six times (6.34 ± 0.27 g/g) of its weight of crude oil within 6 min under one sun illumination (1.00KW/m2). Meanwhile, the lignin-based foam adsorbents were degradable in alkaline environments and CNTs can be recovered from the same condition. They could reach a degradation efficiency of 88.03% in 2 mol/L NaOH aqueous solution at 80 °C for 10 h, and the degradation rate was as high as 6.25 mg/h. Given the novel structural design, excellent environmental friendliness, rapid oil adsorption rate, and high oil adsorption capacity, this work provides a promising solution for addressing catastrophic large-area viscous crude oil spills.
Xiaozhen Ma; Chang Zhang; Pitchaimari Gnanasekar; Peng Xiao; Qing Luo; Shuqi Li; Dongdong Qin; Tao Chen; Jing Chen; Jin Zhu; Ning Yan. Mechanically robust, solar-driven, and degradable lignin-based polyurethane adsorbent for efficient crude oil spill remediation. Chemical Engineering Journal 2021, 415, 128956 .
AMA StyleXiaozhen Ma, Chang Zhang, Pitchaimari Gnanasekar, Peng Xiao, Qing Luo, Shuqi Li, Dongdong Qin, Tao Chen, Jing Chen, Jin Zhu, Ning Yan. Mechanically robust, solar-driven, and degradable lignin-based polyurethane adsorbent for efficient crude oil spill remediation. Chemical Engineering Journal. 2021; 415 ():128956.
Chicago/Turabian StyleXiaozhen Ma; Chang Zhang; Pitchaimari Gnanasekar; Peng Xiao; Qing Luo; Shuqi Li; Dongdong Qin; Tao Chen; Jing Chen; Jin Zhu; Ning Yan. 2021. "Mechanically robust, solar-driven, and degradable lignin-based polyurethane adsorbent for efficient crude oil spill remediation." Chemical Engineering Journal 415, no. : 128956.
Commercial paints and coatings can serve as a protective barrier for metallic substrates in a corrosive environment. A considerable variety of nanostructures can be embedded in a polymeric coating to achieve both barrier and active protection. This research aims to elucidate the role of polyaniline (PANI) as an active polyelectrolyte modifier for the surface modification of mesoporous silica nanoparticles (MSNs) doped with zinc cations (Zn2+). To characterize the samples, we employed different techniques, including field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), N2 adsorption-desorption, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), inductively coupled plasma optical emission spectroscopy (ICP-OES), rheometric mechanical spectroscopy (RMS), differential scanning calorimetry (DSC), tensile, and electrochemical impedance spectroscopy (EIS). Characterization of PANI-MSNs proved the formation of PANI shells onto the surface of silica cores, and pH triggered the release of Zn2+ at the alkaline condition. Enhancement in rheological, thermal, and mechanical characteristics revealed good dispersion and chemical interaction between PANI coated nanoparticles and the epoxy matrix. Moreover, epoxy nanocomposite coatings illustrated a dual barrier/active protection after 50 days of salt immersion.
Seyyed Arash Haddadi; Erfan Mehmandar; Hossein Jabari; Ahmad Ramazani S.A.; Rahman Mohammadkhani; Ning Yan; Mohammad Arjmand. Zinc-doped silica/polyaniline core/shell nanoparticles towards corrosion protection epoxy nanocomposite coatings. Composites Part B: Engineering 2021, 212, 108713 .
AMA StyleSeyyed Arash Haddadi, Erfan Mehmandar, Hossein Jabari, Ahmad Ramazani S.A., Rahman Mohammadkhani, Ning Yan, Mohammad Arjmand. Zinc-doped silica/polyaniline core/shell nanoparticles towards corrosion protection epoxy nanocomposite coatings. Composites Part B: Engineering. 2021; 212 ():108713.
Chicago/Turabian StyleSeyyed Arash Haddadi; Erfan Mehmandar; Hossein Jabari; Ahmad Ramazani S.A.; Rahman Mohammadkhani; Ning Yan; Mohammad Arjmand. 2021. "Zinc-doped silica/polyaniline core/shell nanoparticles towards corrosion protection epoxy nanocomposite coatings." Composites Part B: Engineering 212, no. : 108713.
The Cover Feature shows a flexible supercapacitor device fabricated using an electrode composed of lignin‐containing cellulose nanofibrils, reduced graphene oxide, and polyaniline. The natural lignin that is covalently bound to the surface of the cellulose nanofibrils improved the charge storage performance of the electrode. These improvements were explained by the quinone/hydroquinone functional groups in lignin that enable redox reactions to contribute additional pseudocapacitance. More information can be found in the Full Paper by N. R. Tanguy et al.
Nicolas R. Tanguy; Haoran Wu; Sandeep S. Nair; Keryn Lian; Ning Yan. Cover Feature: Lignin Cellulose Nanofibrils as an Electrochemically Functional Component for High‐Performance and Flexible Supercapacitor Electrodes (ChemSusChem 4/2021). ChemSusChem 2021, 14, 993 -993.
AMA StyleNicolas R. Tanguy, Haoran Wu, Sandeep S. Nair, Keryn Lian, Ning Yan. Cover Feature: Lignin Cellulose Nanofibrils as an Electrochemically Functional Component for High‐Performance and Flexible Supercapacitor Electrodes (ChemSusChem 4/2021). ChemSusChem. 2021; 14 (4):993-993.
Chicago/Turabian StyleNicolas R. Tanguy; Haoran Wu; Sandeep S. Nair; Keryn Lian; Ning Yan. 2021. "Cover Feature: Lignin Cellulose Nanofibrils as an Electrochemically Functional Component for High‐Performance and Flexible Supercapacitor Electrodes (ChemSusChem 4/2021)." ChemSusChem 14, no. 4: 993-993.
In this study, non-covalently functionalized graphene oxide (FGO) containing phosphorus and nitrogen was synthesized using dibenzyl N,N′-diethyl phosphoramidite (DDP) via a single step process. Meanwhile, novel bio-based phosphorus containing vanillin epoxy resin (VPE) was made via a two-step process and used as a flame-retardant adhesive. Subsequently, FGO was dispersed in the epoxy resin matrix at different weight ratios as reinforcement for improving mechanical, thermal and flame-retardant properties of the resultant composite systems. Curing behavior of the VPE and FGO mixtures with 4,4′-diaminodiphenylsulfone (DDS) as the crosslinker was investigated using a Differential Scanning Calorimeter (DSC). Thermal and flame-retardant properties of the cured VPE/FGO nanocomposites were systematically investigated by Thermogravimetric Analysis (TGA), Gas Chromatography – Mass Spectrometry (GC-MS), Limited Oxygen Index (LOI), vertical burning test (UL-94), and cone calorimeter test. Results indicated that all VPE/FGO nanocomposites exhibited excellent thermal and flame-retardant properties. In particular, VPE with 9 wt% of FGO achieved the highest LOI value (29.1%) and passed the V-0 rating in the UL-94 test. Furthermore, cone calorimetry test showed that flame retardancy performance of the VPE and VPE/FGO composites significantly improved compared to vanillin epoxy control resin without phosphorus. The gaseous and high boiling pyrolysis products of VPE cured by DDS were collected and characterized by GC/MS to reveal their formation mechanisms. The char layers of the cued VPE showed a high oxidation resistance with intumescent structures. The combined barrier and quenching effects of the char layer imparted VPE with excellent flame retardancy. This study illustrated a promising approach for synthesizing mechanically strong, thermally-stable and environmentally-friendly flame-retardant bio-based composite resins.
Pitchaimari Gnanasekar; Heyu Chen; Nicole Tratnik; Martin Feng; Ning Yan. Enhancing performance of phosphorus containing vanillin-based epoxy resins by P–N non-covalently functionalized graphene oxide nanofillers. Composites Part B: Engineering 2020, 207, 108585 .
AMA StylePitchaimari Gnanasekar, Heyu Chen, Nicole Tratnik, Martin Feng, Ning Yan. Enhancing performance of phosphorus containing vanillin-based epoxy resins by P–N non-covalently functionalized graphene oxide nanofillers. Composites Part B: Engineering. 2020; 207 ():108585.
Chicago/Turabian StylePitchaimari Gnanasekar; Heyu Chen; Nicole Tratnik; Martin Feng; Ning Yan. 2020. "Enhancing performance of phosphorus containing vanillin-based epoxy resins by P–N non-covalently functionalized graphene oxide nanofillers." Composites Part B: Engineering 207, no. : 108585.
Cellulose triacetate (CTA) was first applied as the catalytic support to load Pt nanoparticles for low-temperature formaldehyde (HCHO) decomposition. The room-temperature HCHO decomposition rate of the obtained catalyst (Pt/CTA) is 13.4 times and 4.3 times as high as that of the microcrystalline cellulose-supported Pt catalyst and Pt/TiO2 under the parallel preparation condition, respectively. With facile shaping, the CTA microsphere-supported Pt catalyst and the CTA film-supported Pt catalyst could also exhibit similar HCHO decomposition performance to that of the powdery one. Structural analyses showed that Pt nanoparticles (∼2.3 nm) could densely disperse on the small-area surface of Pt/CTA and provide abundant active sites. Moreover, only the HCHO molecules could slightly adsorb onto CTA, while other HCHO decomposition-related species absolutely could not. This is beneficial to the coordination of various steps of HCHO decomposition and the transfer of reaction species to vicinal active sites of Pt/CTA. HCHO-diffuse reflectance infrared Fourier transformed spectroscopy studies demonstrated that no species were accumulated on the Pt/CTA catalyst. Both the good Pt dispersion and unique adsorption properties of CTA were responsible for the excellent low-temperature HCHO decomposition performance of Pt/CTA.
Long Li; Lei Wang; Xuejuan Zhao; Tongtong Wei; Haibo Wang; Xiaobao Li; Xiaoli Gu; Ning Yan; Licheng Li; Huining Xiao. Excellent Low-Temperature Formaldehyde Decomposition Performance over Pt Nanoparticles Directly Loaded on Cellulose Triacetate. Industrial & Engineering Chemistry Research 2020, 59, 21720 -21728.
AMA StyleLong Li, Lei Wang, Xuejuan Zhao, Tongtong Wei, Haibo Wang, Xiaobao Li, Xiaoli Gu, Ning Yan, Licheng Li, Huining Xiao. Excellent Low-Temperature Formaldehyde Decomposition Performance over Pt Nanoparticles Directly Loaded on Cellulose Triacetate. Industrial & Engineering Chemistry Research. 2020; 59 (50):21720-21728.
Chicago/Turabian StyleLong Li; Lei Wang; Xuejuan Zhao; Tongtong Wei; Haibo Wang; Xiaobao Li; Xiaoli Gu; Ning Yan; Licheng Li; Huining Xiao. 2020. "Excellent Low-Temperature Formaldehyde Decomposition Performance over Pt Nanoparticles Directly Loaded on Cellulose Triacetate." Industrial & Engineering Chemistry Research 59, no. 50: 21720-21728.
The increasing demand for wearable electronics has driven the development of supercapacitor electrode materials toward enhanced energy density, while being mechanically strong, flexible, as well as environmentally friendly and low cost. Taking advantage of faradaic reaction of quinone groups in natural lignin that is covalently bound to the high strength cellulose nanofibrils, we report the fabrication of a novel class of mechanically strong and flexible thin film electrodes with high energy storage performance. The electrodes were made by growing polyaniline (PANI) on flexible films composed of lignin‐containing cellulose nanofibrils (LCNF) and reduced graphene oxide (rGO) nanosheets at various loading levels. The highest specific capacitance was observed for the LCNF/rGO/PANI electrode with 20 wt% rGO nanosheets (475 F g ‐1 at 10 mV s‐1 and 733 F g‐1 at 1 mV s‐1), which represented a 68% improvement as compared to a similar electrode made without lignin. In addition, the LCNF/rGO(20)/PANI electrode demonstrated high rate performance and cycle life (87% after 5000 cycles). These results indicated that LCNF functioned as an electrochemically active multi‐functional component to impart the composite electrode with mechanical strength and flexibility and enhanced overall energy storage performance. LCNF/rGO(20)/PANI electrode was further integrated in a flexible supercapacitor device, revealing the excellent promise of LCNF for fabrication of advanced flexible electrodes with reduced cost and environmental footprint and enhanced mechanical and energy storage performances.
Nicolas Roland Tanguy; Haoran Wu; Sandeep S. Nair; Keryn Lian; Ning Yan. Lignin Cellulose Nanofibrils as an Electrochemically Functional Component for High‐Performance and Flexible Supercapacitor Electrodes. ChemSusChem 2020, 14, 1057 -1067.
AMA StyleNicolas Roland Tanguy, Haoran Wu, Sandeep S. Nair, Keryn Lian, Ning Yan. Lignin Cellulose Nanofibrils as an Electrochemically Functional Component for High‐Performance and Flexible Supercapacitor Electrodes. ChemSusChem. 2020; 14 (4):1057-1067.
Chicago/Turabian StyleNicolas Roland Tanguy; Haoran Wu; Sandeep S. Nair; Keryn Lian; Ning Yan. 2020. "Lignin Cellulose Nanofibrils as an Electrochemically Functional Component for High‐Performance and Flexible Supercapacitor Electrodes." ChemSusChem 14, no. 4: 1057-1067.
Formaldehyde-free, water-resistant, and environmentally friendly wood adhesives were prepared from starches via a simple one-step epoxidation reaction followed by cross-linking using diethylenetriamine. This study focused on the effect of amylose/amylopectin ratio of starch (high amylose, low amylose, and amylopectin) on the epoxidation reaction and on the bonding performance of the prepared epoxidized starches. The epoxidation of starches altered the fluid behavior of the resins, from Newtonian for pristine epoxy to shear thinning, that corroborated the successful integration of starch chains as part of the epoxy resin. Epoxidized amylopectin had the highest viscosity, 114 Pa.s, and a high degree of substitution, 2.33 ± 0.10, among the starches that indicated that amylopectin is more favorable for the grafting of epoxy groups and for the integration of starch chains in epoxy resins compared to the starches with high amylose content. Bonding strengths were determined by lap shear tests on yellow birch specimens in dry, wet, and boiled conditions. High amylopectin epoxidized starch showed the highest lap shear bonding performance under wet conditions (5.50 ± 0.451 MPa). Under boiled conditions, all three epoxidized starches showed equally better performance than the unreacted starch-filled epoxy blends. This study provides fundamental insights into the effect of starch molecular structure on epoxidation reaction and adhesion properties and suggests a promising approach for developing strong formaldehyde-free sustainable biobased wood adhesives.
Nicole Tratnik; Pei-Yu Kuo; Nicolas R. Tanguy; Pitchaimari Gnanasekar; Ning Yan. Biobased Epoxidized Starch Wood Adhesives: Effect of Amylopectin and Amylose Content on Adhesion Properties. ACS Sustainable Chemistry & Engineering 2020, 8, 17997 -18005.
AMA StyleNicole Tratnik, Pei-Yu Kuo, Nicolas R. Tanguy, Pitchaimari Gnanasekar, Ning Yan. Biobased Epoxidized Starch Wood Adhesives: Effect of Amylopectin and Amylose Content on Adhesion Properties. ACS Sustainable Chemistry & Engineering. 2020; 8 (49):17997-18005.
Chicago/Turabian StyleNicole Tratnik; Pei-Yu Kuo; Nicolas R. Tanguy; Pitchaimari Gnanasekar; Ning Yan. 2020. "Biobased Epoxidized Starch Wood Adhesives: Effect of Amylopectin and Amylose Content on Adhesion Properties." ACS Sustainable Chemistry & Engineering 8, no. 49: 17997-18005.
A novel chemical architecture, vanillin-based phosphorus-containing flame-retardant building block (VP), was successfully synthesized as a sustainable platform biomolecule to be converted into fire-retardant epoxy (VPE) and polyurethane (VPU) resins for application as environmentally friendly adhesives. Structural characterizations confirmed the successful functionalization through their molecular structures. A series of VPU and VPE blends were prepared that showed excellent dry and wet bonding strengths and superior self-extinguishing flame retardancy. The highest bonding strengths, the maximum LOI value, and the lowest heat release rate in cone calorimetry tests were achieved by the VPE/VPU (80:20) blend due to the strong synergistic interpenetrating networks formed between the epoxy and PU macromolecules. The GC-MS analysis of the char residues indicated that the mechanisms for flame retardancy were a combination of the quenching effect from the phosphorus-containing free radicals and the diluting effect of the nonflammable gases in the gas phase, plus the formation of phosphorus-rich char layers in the condensed phase. This study showcased a highly promising approach to develop environmentally friendly high-performance flame-retardant chemicals using nontoxic vanillin as the starting material.
Pitchaimari Gnanasekar; Martin Feng; Ning Yan. Facile Synthesis of a Phosphorus-Containing Sustainable Biomolecular Platform from Vanillin for the Production of Mechanically Strong and Highly Flame-Retardant Resins. ACS Sustainable Chemistry & Engineering 2020, 8, 17417 -17426.
AMA StylePitchaimari Gnanasekar, Martin Feng, Ning Yan. Facile Synthesis of a Phosphorus-Containing Sustainable Biomolecular Platform from Vanillin for the Production of Mechanically Strong and Highly Flame-Retardant Resins. ACS Sustainable Chemistry & Engineering. 2020; 8 (47):17417-17426.
Chicago/Turabian StylePitchaimari Gnanasekar; Martin Feng; Ning Yan. 2020. "Facile Synthesis of a Phosphorus-Containing Sustainable Biomolecular Platform from Vanillin for the Production of Mechanically Strong and Highly Flame-Retardant Resins." ACS Sustainable Chemistry & Engineering 8, no. 47: 17417-17426.
Polyurethane (PU), as a polymer material with versatile product forms and excellent performance, is used in coatings, elastomers, adhesives, and foams widely. However, the raw materials (polyols and isocyanates) of PU are usually made using petroleum‐derived chemicals. With the concern for depletion of petroleum resources and the associated negative impact on the environment, developing technologies that can use renewable raw materials as feedstock has become a research hotspot. Lignin, as an abundant, natural, and renewable organic carbon resource, has been explored as raw material for making polyurethanes because it possesses rich hydroxyl groups on its surface. Meanwhile, compared to vegetable oils, lignin does not compete with food supply and performance of the resulting products is superior. Lignin or modified lignin has been shown to impart the polyurethane material with additional functionalities, such as UV‐blocking ability, hydrophobicity, and flame retardancy. However, the utilization of lignin has encountered some challenges, such as product isolation, heterogeneity, aggregation, steric hindrance, and low activity. This paper summarizes recent research progress on utilizing lignin and modified lignin for bio‐based polyurethane synthesis with a focus on elastomers and foams. Opportunities and challenges for application of the lignin‐based polyurethanes in various fields are also discussed.
Xiaozhen Ma; Jing Chen; Jin Zhu; Ning Yan. Lignin‐Based Polyurethane: Recent Advances and Future Perspectives. Macromolecular Rapid Communications 2020, 42, e2000492 .
AMA StyleXiaozhen Ma, Jing Chen, Jin Zhu, Ning Yan. Lignin‐Based Polyurethane: Recent Advances and Future Perspectives. Macromolecular Rapid Communications. 2020; 42 (3):e2000492.
Chicago/Turabian StyleXiaozhen Ma; Jing Chen; Jin Zhu; Ning Yan. 2020. "Lignin‐Based Polyurethane: Recent Advances and Future Perspectives." Macromolecular Rapid Communications 42, no. 3: e2000492.
Heyu Chen; Pitchaimari Gnanasekar; Sandeep S. Nair; Wenbiao Xu; Prashant Chauhan; Ning Yan. Lignin as a Key Component in Lignin-Containing Cellulose Nanofibrils for Enhancing the Performance of Polymeric Diphenylmethane Diisocyanate Wood Adhesives. ACS Sustainable Chemistry & Engineering 2020, 8, 17165 -17176.
AMA StyleHeyu Chen, Pitchaimari Gnanasekar, Sandeep S. Nair, Wenbiao Xu, Prashant Chauhan, Ning Yan. Lignin as a Key Component in Lignin-Containing Cellulose Nanofibrils for Enhancing the Performance of Polymeric Diphenylmethane Diisocyanate Wood Adhesives. ACS Sustainable Chemistry & Engineering. 2020; 8 (46):17165-17176.
Chicago/Turabian StyleHeyu Chen; Pitchaimari Gnanasekar; Sandeep S. Nair; Wenbiao Xu; Prashant Chauhan; Ning Yan. 2020. "Lignin as a Key Component in Lignin-Containing Cellulose Nanofibrils for Enhancing the Performance of Polymeric Diphenylmethane Diisocyanate Wood Adhesives." ACS Sustainable Chemistry & Engineering 8, no. 46: 17165-17176.
Qing Luo; Jing Chen; Pitchaimari Gnanasekar; Xiaozhen Ma; Dongdong Qin; Haining Na; Jin Zhu; Ning Yan. Highly Cross-Linked and Stable Shape-Memory Polyurethanes Containing a Planar Ring Chain Extender. ACS Applied Polymer Materials 2020, 2, 5259 -5268.
AMA StyleQing Luo, Jing Chen, Pitchaimari Gnanasekar, Xiaozhen Ma, Dongdong Qin, Haining Na, Jin Zhu, Ning Yan. Highly Cross-Linked and Stable Shape-Memory Polyurethanes Containing a Planar Ring Chain Extender. ACS Applied Polymer Materials. 2020; 2 (11):5259-5268.
Chicago/Turabian StyleQing Luo; Jing Chen; Pitchaimari Gnanasekar; Xiaozhen Ma; Dongdong Qin; Haining Na; Jin Zhu; Ning Yan. 2020. "Highly Cross-Linked and Stable Shape-Memory Polyurethanes Containing a Planar Ring Chain Extender." ACS Applied Polymer Materials 2, no. 11: 5259-5268.
An ultra-tough conductive composite hydrogel with antibacterial activity and UV-shielding performance was prepared via a simple soaking approach. The soaking agent [email protected] was synthesized via a simple microwave-assisted reduction method using the green biomass tannic acid (TA) and sodium lignosulfonate (LS) as the carrier for silver nanoparticles (Ag NPs). The [email protected]/PVA composite hydrogel was then prepared by soaking the pure poly(vinyl alcohol) (PVA) hydrogel into the [email protected] suspension. The dense hydrogen bonding interactions between the hydroxyl groups in PVA chain and oxygen-containing groups in [email protected] endowed the composite hydrogel with excellent mechanical properties including great tensile strength (5.43 MPa), high toughness (30.51 MJ/m3) and outstanding crack resistance performance. The composite hydrogel also exhibited good electrical performance with high conductivity (4.1 S/m) and favorable sensitivity to stretch, compression, bending and handwriting. In addition, the composite hydrogel performed excellent antibacterial activity and UV-blocking property. This study provides a feasible approach for fabricating multifunctional hydrogels integrating the good mechanical performance with high conductivity and electric sensing, and excellent antibacterial activity for promising flexible electronic applications.
Xiao Zhang; Danting Sun; Junqi Cai; Weifeng Liu; Ning Yan; Xueqing Qiu. Robust Conductive Hydrogel with Antibacterial Activity and UV-Shielding Performance. Industrial & Engineering Chemistry Research 2020, 59, 1 .
AMA StyleXiao Zhang, Danting Sun, Junqi Cai, Weifeng Liu, Ning Yan, Xueqing Qiu. Robust Conductive Hydrogel with Antibacterial Activity and UV-Shielding Performance. Industrial & Engineering Chemistry Research. 2020; 59 (40):1.
Chicago/Turabian StyleXiao Zhang; Danting Sun; Junqi Cai; Weifeng Liu; Ning Yan; Xueqing Qiu. 2020. "Robust Conductive Hydrogel with Antibacterial Activity and UV-Shielding Performance." Industrial & Engineering Chemistry Research 59, no. 40: 1.
A new chemical architecture from abietic acid, consisting of a cycloaliphatic unsaturated terminal diisocyanate (AADI) structure, was synthesized and fully characterized. This is the first time that multiple shape recovery polyurethane (SMPU) network based on abietic acid has been reported. In this study, we designed an amorphous and biocompatible SMPU network system with adjustable cross‐linking densities over a wide range using AADI. The SMPU network showed good shape memory properties with a shape fixing rate of greater than 98% and a shape recovery rate of 95%. In vitro hydrolytic biodegradation weight loss ratio of SMPUs reached 71% within 8 weeks. The physical properties of these SMPU’s were comparable to what were reported for SMPU’s obtained using petroleum‐derived commercially available diisocyanates. These environmentally‐friendly SMPUs displayed a wide range of physic‐mechanical properties with promising hydrolytic degradability, showing good potential for practical applications.
Pitchaimari Gnanasekar; Jing Chen; Shrestha Roy Goswami; Heyu Chen; Ning Yan. Sustainable Shape‐Memory Polyurethane from Abietic Acid: Superior Mechanical Properties and Shape Recovery with Tunable Transition Temperatures. ChemSusChem 2020, 13, 5749 -5761.
AMA StylePitchaimari Gnanasekar, Jing Chen, Shrestha Roy Goswami, Heyu Chen, Ning Yan. Sustainable Shape‐Memory Polyurethane from Abietic Acid: Superior Mechanical Properties and Shape Recovery with Tunable Transition Temperatures. ChemSusChem. 2020; 13 (21):5749-5761.
Chicago/Turabian StylePitchaimari Gnanasekar; Jing Chen; Shrestha Roy Goswami; Heyu Chen; Ning Yan. 2020. "Sustainable Shape‐Memory Polyurethane from Abietic Acid: Superior Mechanical Properties and Shape Recovery with Tunable Transition Temperatures." ChemSusChem 13, no. 21: 5749-5761.
Biorefinery from bark waste stream to cyclic carbonate with immobilization of CO2 for non-isocyanate polyurethanes.
Heyu Chen; Prashant Chauhan; Ning Yan. “Barking” up the right tree: biorefinery from waste stream to cyclic carbonate with immobilization of CO2 for non-isocyanate polyurethanes. Green Chemistry 2020, 22, 6874 -6888.
AMA StyleHeyu Chen, Prashant Chauhan, Ning Yan. “Barking” up the right tree: biorefinery from waste stream to cyclic carbonate with immobilization of CO2 for non-isocyanate polyurethanes. Green Chemistry. 2020; 22 (20):6874-6888.
Chicago/Turabian StyleHeyu Chen; Prashant Chauhan; Ning Yan. 2020. "“Barking” up the right tree: biorefinery from waste stream to cyclic carbonate with immobilization of CO2 for non-isocyanate polyurethanes." Green Chemistry 22, no. 20: 6874-6888.
A simple and rapid synthesis of bio-based epoxy resin derived from vanillyl alcohol was performed and its chemical structure was confirmed by FTIR, 1H and 13C NMR spectroscopy. Vanillin based epoxy resin (VE) was further reinforced by lignin-containing cellulose nanofibrils (LCNFs) with different weight ratios. Characteristics of the resin and the nanocomposites, including the curing process, chemical structure, morphology, mechanical performance, thermo-mechanical properties, and thermal degradation behavior were studied. A significant improvement in the mechanical performance of the nanocomposites was achieved with a low level of nanofibril addition. Tensile strength and toughness increased by 81% and 185%, respectively, when 1 wt% of LCNFs were used. The nanocomposite also showed an increase in thermo-mechanical properties as measured by dynamic mechanical analysis (DMA), and increased resistance to thermal degradation as shown by higher onset temperature and final char value in thermogravimetric analysis (TGA). This study showcased a promising approach to make environmental-friendly sustainable bio-based epoxy products with superior performance.
Zhenyu Wang; Pitchaimari Gnanasekar; Sandeep Sudhakaran Nair; Ramin R. Farnood; Songlin Yi; Ning Yan. Biobased Epoxy Synthesized from a Vanillin Derivative and Its Reinforcement Using Lignin-Containing Cellulose Nanofibrils. ACS Sustainable Chemistry & Engineering 2020, 8, 11215 -11223.
AMA StyleZhenyu Wang, Pitchaimari Gnanasekar, Sandeep Sudhakaran Nair, Ramin R. Farnood, Songlin Yi, Ning Yan. Biobased Epoxy Synthesized from a Vanillin Derivative and Its Reinforcement Using Lignin-Containing Cellulose Nanofibrils. ACS Sustainable Chemistry & Engineering. 2020; 8 (30):11215-11223.
Chicago/Turabian StyleZhenyu Wang; Pitchaimari Gnanasekar; Sandeep Sudhakaran Nair; Ramin R. Farnood; Songlin Yi; Ning Yan. 2020. "Biobased Epoxy Synthesized from a Vanillin Derivative and Its Reinforcement Using Lignin-Containing Cellulose Nanofibrils." ACS Sustainable Chemistry & Engineering 8, no. 30: 11215-11223.
Due to the increased awareness of utilization of waste biomass utilization for higher sustainability and concern for indoor air pollution associated with formaldehyde emission by wood adhesives, there are strong interests in developing bio-based formaldehyde-free wood adhesives for plywood production. In this study, bark and soybean meal were used as raw materials to develop a cost-effective and formaldehyde-free wood adhesive through epoxidation of bark extractives to enhance performance of soybean meal-based (SM) adhesive. The bark-based bio-epoxy resin (BEP) reacted with functional groups on the protein and formed a cross-linked structure, which improved water resistance, mechanical strength, and thermal stability of the cured adhesive. Plywood bonded by the adhesive with 10 wt% of BEP showed a wet shear bonding strength of 0.89MPa exceeding that of the SM-only adhesive by 187.1%, which met requirements for interior use plywood. Meanwhile, the dry shear bonding strength and cold water soaking bonding strength were improved by 56.9% and 81.1%, respectively. Further, the viscosity of the adhesive reduced to 10,700 mPa·s and solids content of the adhesive increased to 32.05%, which improved technological applicability of the bio-based adhesive for plywood production. Thus, this novel waste biomass derived formaldehyde free adhesive has excellent promises to be applied as environmental-friendly commercial wood adhesive for plywood production.
Jing Luo; Ying Zhou; Qiang Gao; Jianzhang Li; Ning Yan. From Wastes to Functions: A New Soybean Meal and Bark-Based Adhesive. ACS Sustainable Chemistry & Engineering 2020, 1 .
AMA StyleJing Luo, Ying Zhou, Qiang Gao, Jianzhang Li, Ning Yan. From Wastes to Functions: A New Soybean Meal and Bark-Based Adhesive. ACS Sustainable Chemistry & Engineering. 2020; ():1.
Chicago/Turabian StyleJing Luo; Ying Zhou; Qiang Gao; Jianzhang Li; Ning Yan. 2020. "From Wastes to Functions: A New Soybean Meal and Bark-Based Adhesive." ACS Sustainable Chemistry & Engineering , no. : 1.
Conversion of biomass into renewable chemicals and fuels has received significant attention as an approach to enhance global sustainability. Biomass conversion, especially carbohydrate conversion, commonly involves cascade reactions. During these cascade reactions, various activity sites on carbohydrates may have different reactivities that enable us to control the final products through adjusting these activity sites. Heteropolyacids (HPAs), one of the major solid acid catalysts, are extensively used in biomass conversion owing to their numerous excellent physicochemical properties, such as strong Brønsted acidity, oxidizability, structural versatility, and easy design. Accordingly, this review aims to outline recent breakthroughs in obtaining platform chemicals from carbohydrates by cascade reactions involving heteropolyacid catalysts. Moreover, the relationship between the final products and the structure of heteropolyacid catalysts is discussed and insights will help us to design more efficient solid acid catalysts for conversion of biomass to more sustainable chemical products.
Zhong Sun; Xixin Duan; Pitchaimari Gnanasekarc; Ning Yan; JunYou Shi. Review: cascade reactions for conversion of carbohydrates using heteropolyacids as the solid catalysts. Biomass Conversion and Biorefinery 2020, 1 -19.
AMA StyleZhong Sun, Xixin Duan, Pitchaimari Gnanasekarc, Ning Yan, JunYou Shi. Review: cascade reactions for conversion of carbohydrates using heteropolyacids as the solid catalysts. Biomass Conversion and Biorefinery. 2020; ():1-19.
Chicago/Turabian StyleZhong Sun; Xixin Duan; Pitchaimari Gnanasekarc; Ning Yan; JunYou Shi. 2020. "Review: cascade reactions for conversion of carbohydrates using heteropolyacids as the solid catalysts." Biomass Conversion and Biorefinery , no. : 1-19.
Today many efforts have been made in biomass for high-value products. In this paper, conversion of cotton cellulose to ZnO/C anodes for lithium-ion batteries (LIBs) was achieved via a simultaneously hierarchical “bottom-up” assembly in a sustainable solvent system. Cotton linter was dissolved in a newly developed aqueous NaOH/zinc nitrate solution, which avoided the usage of common toxic organic cellulose solvents. What is more, the zinc salts therein not only facilitated the cellulose dissolution, but were also in-situ utilized as the precursor to transform into ZnO nanoparticles, thus no additional reagents or reaction were needed. Simultaneously, cellulose was regenerated from the solution by self-assembly of its macromolecules as fibrous microspheres encapsulating the ZnO. The self-driven assembly of cellulose molecules as the building block in the solution could provide a highly porous structure as the carbon source to ensure the better performance of the anode materials than the regular non-assembled bio-derived substrate, while most importantly, no waste or by-products would be produced during the self-assembly process. The final ZnO/C composites were characterized as a lithium-ion battery anode, which exhibited stable charging and discharging performance. This work demonstrated a novel process for the biomass conversion via a sustainable and efficient strategy for high value-added materials.
Sen Wang; Luyang Lyu; Ramin Farnood; Ning Yan. Conversion of cotton cellulose to ZnO/C anodes for lithium-ion batteries via a sustainable self-assembly process in a green solvent. Materials Today Sustainability 2020, 9, 100038 .
AMA StyleSen Wang, Luyang Lyu, Ramin Farnood, Ning Yan. Conversion of cotton cellulose to ZnO/C anodes for lithium-ion batteries via a sustainable self-assembly process in a green solvent. Materials Today Sustainability. 2020; 9 ():100038.
Chicago/Turabian StyleSen Wang; Luyang Lyu; Ramin Farnood; Ning Yan. 2020. "Conversion of cotton cellulose to ZnO/C anodes for lithium-ion batteries via a sustainable self-assembly process in a green solvent." Materials Today Sustainability 9, no. : 100038.
Increasing CO2 levels in atmosphere has led to the unprecedented climate change in recent years. Conventional methods for CO2 capture are often cost inefficient, unsafe and result in secondary pollution in environment. Many microorganisms can assimilate CO2 as sole carbon source and convert it into valuable products. Recently, the microbial CO2 fixation techniques have been attracting much attention for reducing greenhouse gases and subsequent production of value-added products. The present review deals with introducing of recent advances and biotechnological importance of microbial CO2 fixation, as well as conversion into precursors and commodity chemicals. Aspects including microbial CO2 fixation techniques, microorganisms involving in CO2 fixation, biosynthesis pathways and role of genetic and metabolic engineering, microbial conversion of CO2 to various metabolites and high value bio-based products, and emerging industrial application fields of CO2 capture are summarized and presented.
Hossein Salehizadeh; Ning Yan; Ramin Farnood. Recent advances in microbial CO2 fixation and conversion to value-added products. Chemical Engineering Journal 2020, 390, 124584 .
AMA StyleHossein Salehizadeh, Ning Yan, Ramin Farnood. Recent advances in microbial CO2 fixation and conversion to value-added products. Chemical Engineering Journal. 2020; 390 ():124584.
Chicago/Turabian StyleHossein Salehizadeh; Ning Yan; Ramin Farnood. 2020. "Recent advances in microbial CO2 fixation and conversion to value-added products." Chemical Engineering Journal 390, no. : 124584.