ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Sufeng Zhang,Gang Liu,Hui Chang,Xinping Li,Zhao Zhang
Optical haze nanopapers were fabricated based on a self-assembly process of lanthanide complexes with tris(2-benzimidazolylmethyl) amine (NTB) [(Tb(NTB)Cl3 and/or Eu(NTB)Cl3] and TEMPO-oxidized cellulose nanofibrils (tCNFs), using a subsequent simple blending-vacuum filtration method. These optical haze nanopapers were characterized in terms of visible light transmittance, efficiency of ultraviolet (UV) light harvesting, and soft-fluorescence emission. The lanthanide complexes acted as a light-scattering source to enhance optical haze (∼100%) and a light emitter to emit soft-fluorescence under a UV light-emitting diode (UV-LED, λex, 365 nm). Due to excellent light-scattering behavior induced by the optical haze nanopaper, UV harvesting efficiency was increased from 53% to 98%, and the absolute quantum efficiency was enhanced from 21% to 25%. The optical haze nanopaper with high efficiency UV harvesting and soft-fluorescent emission presented potential applications in solar cells, lampshades, light diffusers, UV-blocking devices, anticounterfeiting devices, and organic light-emitting diodes.
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Nanomaterials
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2018
·Vol. 8
·期 10
·800
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IF 3.504
Peng Lu,Ren Liu,Xin Liu,Min Wu
Cellulose hydrogels are often prepared from native cellulose through a direct cellulose dissolution approach that often involves tedious process and solvent recovery problems. A self-supporting cellulose hydrogel was prepared by gelation of the TEMPO-oxidized bagasse cellulose nanofibrils (CNF) triggered by strong crosslinking between carboxylate groups and Zn2+. TEMPO process was used to generate negatively charged carboxylate groups on CNF surface to provide a high binding capability to Zn2+. Three TEMPO-oxidized CNFs of different carboxylate contents were prepared and characterized. TEM and AFM microscopes suggested that the sizes of CNFs were fined down and carboxylated cellulose nanofibrils (TOCNFs) of 5–10 nm wide, 200–500 nm long, and carboxylate contents 0.73–1.29 mmol/g were obtained. The final structures and compressive strength of hydrogels were primarily influenced by interfibril Zn2+-carboxylate interactions, following the order of TOCNFs concentration > content of carboxylate groups > concentration of zinc ions. A CO2sensitive self-supporting cellulose hydrogel was developed as a colorimetric indicator of food spoilage for intelligent food packaging applications.Keywords:hydrogel;cellulose nanofibrils;zinc ions;ionic cross-linking;bagasse cellulose fiber
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高影响因子
JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Jingyi Wu,Hongxia Zeng,Qingxuan Shi,Xiongwei Li,Qing Xia,Zhigang Xue,Yunsheng Ye,Xiaolin Xie
Uncontrollable lithium (Li) dendrite growth has hampered the application of lithium metal batteries (LMBs). Herein, a novel plastic crystal composite polymer electrolyte (nh-CPE) consisting of multifunctional two-dimensional (2D) molybdenum disulfide (MoS 2 ) and ion-conducting one-dimensional (1D) surfactant oxidized cellulose nanocrystal (OCNC) is developed to overcome this challenge. The nh-CPE possesses good Li-dendrite-suppressing ability, which is attributed to the well-designed three-dimensional (3D) ion conducting network constructed by homogeneously dispersed MoS 2 and OCNC. This structure facilitates Li-ion conductivity and enables uniform Li deposition on the anode. Moreover, the impermeable MoS 2 nano-flakes with excellent mechanical strength serve as physical barriers to hold the electrolyte-electrode interface stability and consequently block Li dendrite growth and enhance fire retardancy. When applied in LMB, the nh-CPE exhibits excellent cycle performance and rate capability, with 90% capacity retention after 200 cycles at 0.5 C and 60 °C, and a discharge capacity of 128 mAh g −1 at 1 C. Notably, owing to high room-temperature ionic conductivity (0.8 mS cm −1 ), the cell with nh-CPE cycled at room temperature delivers an initial discharge capacity of 144 mAh g −1 . The outstanding performance and simple process offer great opportunity to promote Li-dendrite-suppressing LMBs for practical application.
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COMPOSITES PART B-ENGINEERING
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2018
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IF 4.92
Fanrong Meng,Guoqing Wang,Xueyu Du,Zhifen Wang,Shuying Xu,Yucang Zhang
Banana pseudo-stems fibers were novel extracted via atmospheric liquefaction combined with TEMPO-mediated oxidation . Cellulose nanofibers (CNF) and nanocrystals (CNC) were subsequently obtained by high-intensity ultrasonic treatment and acidolysis, respectively. Liquefied residue content as well as its constituent varied with liquefaction time. Scanning electron microscopy and fourier transform infrared demonstrate that the progressive removal of non-cellulosic impurities. Morphological studies exhibit that CNF present a range of 3∼10 nm in diameter and 140∼690 nm in length, while CNC have average diameter of 3.5 ± 1.6 nm and a length of 93.3 ± 37.6 nm. XRD analysis indicates that the CNCs have a high crystallinity (95.6%). The thermal stability of the fibers was measured by thermogravimetric analysis . The structures and properties of CNF and CNC give it potential to be used in reinforcing polymeric matrix materials .
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APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Xin Ning,Fangxue Wei,Heyun Fu,Xiaolei Qu,Zhaoyi Xu,Shourong Zheng
Supported gold nanoparticles (AuNPs) have recently attracted significant interest in catalysis, with much emphasis on optimizing the catalytic activity of AuNPs. We herein reported the promotion effect of weak ultraviolet (UV) light on the activity of titania nanotube (TNT) supported AuNPs (Au/TNT) for catalytic reduction of 4-nitrophenol by sodium borohydride. The presence of low-intensity UV irradiation increased the turnover frequency of Au/TNT for the reaction by a factor of 2.56–4.97 (increase factor depending on the Au loading amount). The photonic efficiency of the reaction for Au/TNT was found to be far more higher than the literature values for titanium oxide-based catalysts, suggesting that the reaction was not primarily implemented via a photocatalytic pathway. We attributed the pronounced promotion effects to the negative surface charge on AuNPs that formed from the charge separation between AuNPs and TNT. The negative surface charge assisted the formation of active Au-H intermediates and the activation of 4-nitrophenol molecules, giving rise to markedly enhanced catalytic activity for 4-nitrophenol reduction under low-intensity UV irradiation. The findings imply that weak UV irradiation is a very efficient and cost-effective approach to tune the surface charge and hence catalytic activity of semiconductor supported AuNPs.
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DESALINATION
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2013
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IF 3.041
Xinwang Cao,Meiling Huang,Bin Ding,Jianyong Yu,Gang Sun
Conventional ultrafiltration (UF) or nanofiltration (NF) filters for water treatments are based on porous membranes, where the torturous porosity usually results in a relatively low flux rate , typically manufactured by the phase immersion method. Electrospun (ES) nanofibrous membranes with a high flux rate evoked a considerable interest in the ultrafiltration or nanofiltration applications, because of their high porosity, good interconnectivity and high specific surface area. Herein, we developed a novel double layers of polyacrylonitrile (PAN) electrospun nanofibrous membranes (with an average fiber diameter of 173 nm) reinforced with TEMPO (2, 2, 6, 6-tetramethylpiperidine-1-oxyl radical) selectively oxidized jute cellulose nanowhiskers (with a diameter in the range of 3–10 nm). From FE-SEM images, the presence of evenly coated thin layer of cellulose nanowhiskers on the PAN ES nanofibers is evident. The versatile PAN/cellulose ES composite membranes with superior mechanical properties and high filtration efficiency of 7–40 nm particles would be particularly useful for applications in the domestic drinking water and industrial waste water treatment.
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CARBOHYDRATE POLYMERS
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2014
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IF 3.916
Qingyuan Niu,Kezheng Gao,Wenhui Wu
A cellulose nanofibril film is modified by chemical assembly of boronate-terminated conjugated polymer chains at its specific sites, C-6 carboxyl groups. The modified cellulose nanofibril film is used as a fluorescent sensor for nitroaromatic vapor. Thanks to the specific reactive sites, numerous loose cavities or pathways located in the film sensor's out-layer have been formed, and the fraction of easily accessible cavities of the novel fluorescent film sensor is up to 0.97, which could benefit the penetration and diffusion of analyte vapor. Therefore, the novel fluorescent film sensor exhibits high sensitivity toward nitroaromatic vapor with a fast response. The fluorescence quenching efficiency of the chemical-assembly film sensor is about 3 times larger than that of the spin-cast film sensor using the same conjugated polymer for 600 s exposure to DNT vapor. In addition, the novel fluorescent film sensor shows good reversibility.
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高影响因子
RSC Advances
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2013
·Vol. 3
·期 35
·15058-15064
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IF 2.562
Kezheng Gao,Ziqiang Shao,Xi Wang,Yunhua Zhang,Wenjun Wang,Feijun Wang
In recent years, much effort has been dedicated to achieve environmentally friendly, low cost, and excellent performance energy storage devices. In this work, cellulose nanofibers (CNFs)/multi-walled carbon nanotubes (MWCNTs) hybrid aerogels are prepared from CNFs/MWCNTs hydrogels by supercritical CO2 drying using CNFs as an effective, environmentally friendly, and steady dispersant of MWCNTs. All-solid-state flexible supercapacitors are fabricated using CNFs/MWCNTs hybrid aerogel film as the electrode material and charge collector. One-dimensional CNFs can effectively prevent the aggregation of MWCNTs, significantly enhance the re-wettability, and improve the utilization efficiency of the mesopores. Therefore, CNFs/MWCNTs hybrid aerogel film-based all-solid-state flexible supercapacitors exhibit excellent electrochemical properties: the specific capacitance is about 178 F g−1. The flexible supercapacitors also exhibit excellent cyclic stability. Our work provides a novel method using low cost, and environmentally friendly CNFs to realize the full potential of the MWCNTs in an assembled bulk form. Taking its low cost and environmentally friendliness, CNFs/MWCNTs hybrid aerogel has great potential as the electrode material for all-solid-state flexible supercapacitors.
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CARBOHYDRATE POLYMERS
·
2013
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IF 3.479
Yiming Zhou,Shiyu Fu,Liangliang Zhang,Huaiyu Zhan
Superabsorbents based on carboxylated cellulose nanofibrils (CCNFs) and carboxymethyl cellulose-g-poly(acrylic acid-co-acrylamide) were synthesized. A series of experiments were performed to evaluate the influence of factors such as CCNFs amount, solution pH, temperature, salt solution type and concentration on the swelling behaviors of the hydrogels. The water uptake of the hydrogels strongly depended on the CCNF content, the swelling capacity in distilled water increased dramatically from 245.8 to 458.7 g/g with the addition of CCNFs up to 2.5 wt%. Furthermore, the incorporation of CCNFs improved salt resistance properties of the hydrogels with slower deswelling rate and higher water retention capacity at deswelling equilibrium. Besides, the CCNF nanocomposite hydrogels presented better responsive behavior in relation to pH presence and showed an increase in water retention capacity at various temperatures. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were employed to examine the structure and morphologies of the prepared superabsorbent hydrogels.
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CARBOHYDRATE POLYMERS
·
2015
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IF 4.074
Xiaran Miao,Jinyou Lin,Feng Tian,Xiuhong Li,Fenggang Bian,Jie Wang
Cotton stalk bark, as the byproduct of cotton plant, was usually discarded and/or combusted, leading to waste of resources and environment pollution. How to efficiently utilize this kind of cellulosic materials is of significative to energy saving and environment protection. Herein, we report on the extraction of cellulose nanofibrils (CNF) from the cotton stalk bark for the first time by a combination of TEMPO-oxidation and mechanical disintegration method. The obtained CNF showed a yield more than 20 wt%. The morphologies, crystalline structures and thermal properties of CNF were extensively investigated by the transmission electron microscopy, scanning electron microscopy, synchrotron radiation wide-angle X-ray scattering, Fourier transform infrared spectra and differential scanning calorimetry, respectively. The results showed that the final extracted CNF have similar polymorphs with their starting materials and a significantly increased crystallinity. This work will provide a new way to utilize the cotton stalk barks.
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MOLECULAR PHARMACEUTICS
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2014
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IF 4.787
Huan Huang,Duanwen Cao,Linghao Qin,Shouqin Tian,Yang Liang,Shirong Pan,Min Feng
Numerous preclinical studies have demonstrated that polycation mediated gene delivery systems successfully achieved efficient gene transfer into cells and animal models. However, results of their clinical trials to date have been disappointing. That self-assembled gene and polycation systems should be stable undergoing dilution in the body is one of the prerequisites to ensuring efficiency of gene transfer in clinical trials, but it was neglected in most preclinical studies. In this account, we developed the dilution-stable PAMAM G1-grafted polyrotaxane (PPG1) supermolecules in which PAMAM G1-grafted α-cyclodextrins are threaded onto a PEG chain capped with hydrophobic adamantanamine. The PPG1/pDNA polyplex (approximate 100 nm in diameter) was very stable and kept its initial particle size and a uniform size distribution at ultrahigh dilution, whereas DNA/PEI 25K polyplex was above three times bigger at a 16-fold dilution than the initial size and their particle size distribution indicated multiple peaks mainly due to forming loose and noncompacted aggregates. PPG1 supermolecules showed significantly superior transfection efficiencies compared to either PEI 25K or Lipofectamine 2000 in most cell lines tested including normal cells (HEK293A) and cancer cells (Bel7402, HepG2, and HeLa). Furthermore, we found that the PPG1 supermolecules delivered DNA into HEK293A through a caveolae-dependent pathway but not a clathrin-dependent pathway as PEI 25K did. These findings raised the intriguing possibility that the caveolae-dependent pathway of PPG1 supermolecule/pDNA polyplex avoiding lysosomal degradation was attributed to their high transfection efficiency. The dilution-stable PPG1 supermolecule polyplex facilitating caveolae-dependent internalization has potential applications to surmount the challenges of high dilutions in the body and lysosomal degradation faced by most gene therapy clinical trials.
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INTEGRATED FERROELECTRICS
·
2016
·
IF 0.375
Zhang-Yunhua,Liu-Chuanting,Lv-Yanyan,Zhou-Zhenwen,Wang-Feijun,Shao-Ziqiang,Zuo-Yingying,Wei-Xiaolin
Cellulose nanofibers (CNFs) with high aspect ratio was prepared from wood cellulose using 2,2,6,6-tetramethylpiperidine oxygen radical (TEMPO) oxidation method. By UV, TEM, FT-IR, XRD and TG, the characterizations of CNFs were studied. The results showed that CNFs was a a hydrophilic natural nanomaterials with good suspension stability, high aspect ratio and cellulose I crystal structure. The modified double base propellant with high solid content prepared by calendering process was modified by using CNFs as nano-fillers. The results of tensile test and burning test of propellant showed that the mechanical properties and combustion performances of CNFs modified double base propellant had been improved significantly compared to conventional modified double base propellant. The tensile strength and elongation at break can be increased by nearly 34%, 45%,respectively. The burning rate of propellant can be increased by 27.5% while the pressure coefficient decreased by 20%.
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危险品化学品经营许可证（带存储）