JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 15
·48564
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IF 2.188
Yunyun Yu,Yanlai Wang,Penghu Deng,Tonghua Zhang
This work presented a new method for preparing cellulose nanofibril (CNF)/Fe 3 O 4 @rGO composite aerogels with enhanced magnetic and mechanical properties. The composite aerogels were obtained through compounding, gelling, washing, tert -butanol replacing, and freeze-drying. The structural characteristics of composite aerogels were investigated via scanning electron microscopy, Fourier transform infrared, and X-ray diffraction. Results showed that the composite aerogels had interconnected three-dimensional porous network microstructures, and the Fe 3 O 4 @rGO hybrids were uniformly dispersed in the aerogels. Moreover, the aerogels' magnetization and compression characteristics were also studied. Magnetic measurements indicated that composite aerogels had good magnetization characteristics with the saturation magnetization value of 6.75 emu/g. The uniaxial compression tests showed that the compression strength and Young's modulus of the composite aerogels were significantly improved by 32.33 and 118.56%, respectively, relative to those of CNF aerogels. The perfect combination of structure and performance may render the composite aerogels useful for commercial applications in the fields of environmental engineering, biomedical engineering, electronics, and energy. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48564.
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Polymers
·
2019
·Vol. 11
·期 10
·1593
·
IF 3.164
Hajo Yagoub,Liping Zhu,Mahmoud H. M. A. Shibraen,Ali A. Altam,Dafaalla M. D. Babiker,Songmiao Liang,Yan Jin,Shuguang Yang
The complex aerogel generated from nano-polysaccharides, chitin nanocrystals (ChiNC) and TEMPO-oxidized cellulose nanofibers (TCNF), and its derivative cationic guar gum (CGG) is successfully prepared via a facile freeze-drying method with glutaraldehyde (GA) as cross-linkers. The complexation of ChiNC, TCNF, and CGG is shown to be helpful in creating a porous structure in the three-dimensional aerogel, which creates within the aerogel with large pore volume and excellent compressive properties. The ChiNC/TCNF/CGG aerogel is then modified with methyltrichlorosilane (MTCS) to obtain superhydrophobicity/superoleophilicity and used for oil–water separation. The successful modification is demonstrated through FTIR, XPS, and surface wettability studies. A water contact angle of 155° on the aerogel surface and 150° on the surface of the inside part of aerogel are obtained for the MTCS-modified ChiNC/TCNF/CGG aerogel, resulting in its effective absorption of corn oil and organic solvents (toluene, n-hexane, and trichloromethane) from both beneath and at the surface of water with excellent absorption capacity (i.e., 21.9 g/g for trichloromethane). More importantly, the modified aerogel can be used to continuously separate oil from water with the assistance of a vacuum setup and maintains a high absorption capacity after being used for 10 cycles. The as-prepared superhydrophobic/superoleophilic ChiNC/TCNF/CGG aerogel can be used as a promising absorbent material for the removal of oil from aqueous media.Keywords:cellulose nanofiber;chitin nanocrystals;cationic guar gum;aerogel;oil absorption
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CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Xiao Chen,Jian Cui,Xuran Xu,Bianjing Sun,Lei Zhang,Wei Dong,Chuntao Chen,Dongping Sun
In recent decades, increased industrial activities have led to the release of various pollutants, such as toxic heavy metals, inorganic anions, and organics. It is imperative but challenging to develop an eco-friendly treatment technology with easy operation, low cost, and high efficiency. Here, we describe a design of magnetic purifier, which has biomass-based structure by blending attapulgite/chitosan (ATP/CS) composite with bacterial cellulose nanofibrils (BCNs). Compared to similar materials reported previously, our product exhibited efficient adsorption capacities towards various metal ions including Pb 2+ , Cu 2+ , and Cr 6+ , and anionic organic dyes including Congo red. The adsorption process could be well fitted by Langmuir isotherm and pseudo-second order equation. Additionally, the adsorption capacity only decreased less than 8% after five adsorption-desorption cycles. We expect our design will inspire more efforts to build a multifunctional water purifier with simple operation, and hopefully effectively remove pollutants from wastewater in future practical applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Lijie Zhou,Zhaoyang Xu
In increasingly serious marine pollution environment, environmentally friendly low-density aerogels have become potential oil-water separation materials. However, many reported aerogels have the drawbacks of low oil absorption, poor compressibility and flexibility, which limit their application. Herein, we reported a compressible, anisotropic lamellar hydrophobic and lipophilic graphene/polyvinyl alcohol/cellulose nanofiber carbon aerogel (a-GPCCA) prepared by directional freeze-drying and carbonization processes. The synthetic ultralight a-GPCCA had low density (6.17 mg/cm 3 ) and high porosity (99.61 %). Moreover, directional freeze-drying resulted in a lamellar interpenetrated three-dimensional porous structure, which endowed it with high adsorption capacity (155–288 times of its weight), good compressibility (95 % recovery after repeating 15 cycles at 50 % strain in parallel to the freezing direction) and recyclability (oil retention rate reached 88.8 % after 10 absorption-compression cycles). Furthermore, carbonization provided it with excellent thermal stability and hydrophobic properties, resulting in oil-water selectivity and combustion cyclicity (the oil absorption capacity was reduced by only 10.2 % after 10 absorption-combustion cycles). Therefore, the a-GPCCA obtained in this study possesses a promising potential in the field of treatment of offshore oil spills and domestic industrial wastewater.
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Materials Research Express
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2019
·Vol. 6
·期 12
·125327
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IF 1.449
Guyu Feng,Xinyue Wang,Diantang Zhang,Xueliang Xiao,Kun Qian
In recent years, there has been increasing interest on maintaining the efficiency of Polypropylene (PP) fibers by various methods during its application. In this paper, bilayer antioxidant microcapsules were successfully prepared with Irgafos168 as inner core, hindered polyphenol as inner shell, and TEMPO as outer shell via in situ polymerization method combined with water phase separation method. Structure and property of microcapsules were investigated by FT-IR, XPS, SEM, and TGA analysis. Results showed that microcapsules were successfully prepared with bilayer structure. Microcapsules had spherical shape with particle sizes of 1.09 ± 0.35 μm. They also had good thermal stability to ensure stable structure and property during melt-spinning process. These microcapsules were then blended with PP melts to fabricate composite PP fibers via melt-spinning technique. DSC measurement and accelerated aging treatment was performed to investigate the effect of microcapsules on aging resistance of composite PP fibers. Results showed that the addition of bilayer microcapsules significantly increased the onset oxidation temperature and decreased the aging rate of PP fibers, indicating that the addition of bilayer microcapsule effectively improved the aging resistance of PP fibers. Furthermore, the addition of microcapsules contributed to maintain sound surface morphology of PP fibers.
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TEXTILE RESEARCH JOURNAL
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2019
·
IF 1.613
Xiang Yeping,Liu Liu,Zhang Ruiyun,Yu Jianyong,Fang Bin,Ji Feng,Jing Miaolei
Hemp fiber, as a kind of renewable textile fiber, has evoked much interest due to its excellent properties in various fields. It has been investigated in just one step to finish the process of chemo-enzymatic degumming and modification of hemp fiber, which is done in acetic acidsodium acetate buffer solution containing laccase (6.0 g), hemicellulase (0.3 g) and 2,2,6,6-tetramethylpiperidine-1-oxyl radical (0.3 g) under a mild condition (pH 5, 50C). The degumming effects of different batches of raw hemp fibers were also discussed. We found that the residual rate, fineness, length and tensile strength of degummed fiber were 15–27%, 9.00–24.00 dtex, 14.00–19.00 cm and 3.8–5.1 cN/dtex, respectively. Meanwhile, some of the oxidized functional groups were introduced into degummed fiber, which improved the moisture absorption and water retention value of the hemp fiber. The hemp fiber treated by this process could be further improved and then applied in the textile industry.
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Bolang Wu,Ge Zhu,Alain Dufresne,Ning Lin
Generally produced by solvent sublimation via freeze-drying or critical point drying treatment, nanocellulose-based aerogels have attracted considerable interest in offering the features such as sustainability, available surface reactivity, lightweight, high porosity, and specific surface area. This study presents a novel strategy for the preparation of fluorescent aerogels based on covalent linkage between the natural skeleton of a cellulose nanofibril (CNF) and a fluorescent carbon dot (CD). The maximum CD grafting content on the CNF-based aerogel was 113 mg g–1, providing bright blue fluorescence under ultraviolet radiation with a high fluorescence quantum yield of 26.2%. Besides improved mechanical properties with a 360% increase in compression strength, the covalently bonded CD nanoparticle further serves as a structural stabilizer to endow the characteristic of shape recovery in water for the fabricated fluorescent aerogel. Finally, this aerogel displays high sensitivity and selection on the recognition of NOx and aldehyde species, which is studied for the detection of glutaraldehyde at ultralow concentrations (ppm) in water. Using the innovation of an organic solvent-free route and avoiding the toxic crosslinking reagents or fluorescent sources, the CNF/CD-based fluorescent aerogel developed in this study is a promising functional material for potential optical sensing application.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 9
·8585-8594
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IF 2.195
Lv Yanyan,Zhou Yi,Shao Ziqiang,Liu Yanhua,Wei Jie,Ye Zhengqing
In order to meet the urgent needs of portable and flexible devices in today’s society, it is strongly demanded to develop a next-generation, low-cost, flexible, lightweight, and sustainable supercapacitor system with high electrochemical performance and good operational safety. Here, a new type of highly flexible and lightweight all-solid-state supercapacitor is developed by using the freestanding and highly porous nanohybrid aerogel films consisting of carbon nanosphere fibers (CNPFs)/molybdenum disulfide (MoS 2 )/reduced graphene oxide (RGO) as electrodes and using H 2 SO 4 /polyvinyl alcohol (PVA) gel as electrolyte. The CNPFs/MoS 2 /RGO nanohybrid aerogels are prepared by one-step pyrolysis of the nanocellulose fibers (NCFs)/MoS 2 /graphene oxide (GO) aerogels obtained via freeze-drying process. During the pyrolysis process, the NCFs is carbonized to CNPFs and the GO is thermally reduced to RGO. The as-prepared all-solid-state flexible supercapacitors exhibit high specific capacitance of 1144.3 F g −1 at 2 mV s −1 with good cycling stability of more than 98% of the capacitance is retained after 10,000 charge–discharge cycles at a current density of 5 mA cm −2 . Moreover, they can deliver high energy density and power density which are up to 57.5 µW h cm −2 (28.8 W h kg −1 ) and 29.1 mW cm −2 (14.5 kW kg −1 ), respectively. Therefore, we provide the highly porous CNPFs/MoS 2 /RGO nanohybrid aerogels with characteristics of superior electrochemical performance, remarkable bending stability, environmental friendliness and low cost will be a potential promising electrode material for highly flexible all-solid-state supercapacitors.
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CARBOHYDRATE POLYMERS
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2019
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IF 6.044
Jun Wu,Xueyu Du,Zhibing Yin,Shuang Xu,Shuying Xu,Yucang Zhang
Coconut waste husks were effectively utilized in this study as a promising cellulose source for production of purified coir cellulose (PCC) after multiple treatments, e.g., ultrasonic-assisted solvent immersion, alkaline treatment, bleaching, etc. As to upgrade the self-value of coir cellulose based products and further broaden their applications in light of biorefinery, coir cellulose nanofibrils (CCNF) with an average diameter of 5.6 ± 1.5 nm were prepared by selection of a milder TEMPO-mediated oxidation system (TEMPO/NaClO/NaClO 2 , pH = 4.8) accompanied by subsequent ultrasonic treatment. The cellulose nanofibrils were comprehensively characterized in terms of their functional groups, crystallinity, morphology, and thermal stability. The potential reinforcement of CCNFs as a filler for biodegradable PVA based films was investigated and the main properties including tensile strength, elongation at break, and thermal stability of CCNF/PVA composite films were significantly enhanced especially when 3% of CCNF (based on dry film weight) was applied.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2019
·Vol. 36
·期 3
·1800412
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IF 4.194
Lin Gan,Na Feng,Siyuan Liu,Shuyu Zheng,Zhen Li,Jin Huang
Fluorescent-labeled cellulose nanocrystal (CNC) films have been used to record and protect information in paper materials, whereas the fluorescent materials usually suffer photobleaching. Herein, a strategy of solid-state emission induced by the vertical assembly of CNCs was established. The assembly-induced emission starts from the structural diffraction of CNC, whose wavelength is adjusted into the ultraviolet (UV) region for hiding information under natural light. The small diameter (≈10 nm) of CNCs then promotes the resonance between the vertically assembled CNCs and the UV light, leading to a strong blue emission with an emitting quantum efficiency as high as 13.90%. By introducing the vertical-assembly film with a specific pattern into paper materials, an anti-counterfeiting image is obtained under a UV radiation. Since CNCs are a kind of cellulose with high crystallinity, this material can be a wear-resistant anti-counterfeiting material for banknotes or other paper applications.
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ACS Omega
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2019
·
IF 2.584
Zeming Jiang,Lan Tang,Xin Gao,Wentao Zhang,Jiwei Ma,Liping Zhang
An electrolyte and aprotic solvent mixture were used to prepare cellulose solutions containing cellulose nanocrystals (CNCs). All-cellulose composite fibers were then produced by dry–wet spinning these solutions. The presence of CNC in the all-cellulose fibers was demonstrated, and the effects of the CNC on the fiber properties were investigated. The all-cellulose fibers were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and electronic tensile measurements. These results showed that CNCs were present in the mixture and that their structure was maintained in the all-cellulose fibers. No compatibility problems between the CNC and cellulose II matrix were observed. Introducing CNC enhanced the crystallinity, thermal stability, and mechanical properties of the composite fibers.
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JOURNAL OF CONTROLLED RELEASE
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2019
·
IF 7.901
Wendi Teng,Liyun Zhao,Songtao Yang,Chengying Zhang,Meiyu Liu,Jie Luo,Junhua Jin,Ming Zhang,Chen Bao,Dan Li,Wei Xiong,Yuan Li,Fazheng Ren
Nonalcoholic fatty liver disease (NAFLD) is the early stage of many metabolic syndromes . The intervention of NAFLD can prevent its further development into severe metabolic syndromes. Given the inefficiency and side effects of chemical drugs for treating NAFLD, the hepatic-targeted nanocarriers loaded with bioactive compounds may offer a more effective and acceptable strategy for eliminating NAFLD. Here we developed hepatic-targeted oxidized starch-lysozyme (OSL) nanocarriers to specifically deliver resveratrol (Res) to liver tissue in order to maximize its therapeutic efficiency. The hepatic targeting was achieved using covalently conjugated galactose (Gal), which is recognized by the asialoglycoprotein receptors specifically expressed in hepatocytes. In steatotic HepG2 cell model, treatment with hepatic-targeted Gal-OSL/Res nanocarriers enhanced the cellular Res uptake and anti-lipogenesis capabilities, and effectively decreased triglyceride accumulation by modulating AMP-activated protein kinase (AMPK)/silent information regulation 2 homolog 1(SIRT1)/fatty acid synthase (FAS)/sterol regulatory element-binding protein-1c (SREBP1c) signaling pathway. In mice, Gal-OSL increased Res delivery into liver tissues and increased their hepatic effective concentration in liver. Most importantly, Gal-OSL/Res nanocarriers effectively reversed NAFLD and recovered hepatic insulin sensitivity of NAFLD mice to the healthy state. Furthermore, Gal-OSL/Res efficiently ameliorated lipid deposition and insulin resistance by modulating AMPK/SIRT1/FAS/SREBP1c signaling pathway and downregulated insulin receptor substrate-1 (IRS-1) phosphorylation at serine 307 in liver. These findings suggested that the hepatic-targeted Gal-OSL nanocarriers delivering Res could potentially serve as a safe and promising platform for NAFLD and other liver related diseases.
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