Analytical Methods
·
2017
·Vol. 9
·期 42
·6044-6048
·
IF 1.9
Yao Gu,Meiling Wang,Guizhen Li
1,4-Dihydroxyanthraquinone (1,4-DHAQ, a fluorophore) doped carbon nanotubes@cellulose (1,4-DHAQ-doped CNTs@CL) nanofibrous membranes have been prepared via electrospinning and subsequent deacetylation in this work. They have been successfully applied for highly sensitive detection of Cu2+ in aqueous solution. The surface area per unit mass (S/M) ratio of the nanofibrous membranes was enhanced by incorporating the CNTs into cellulose. Moreover, the excellent metal ion sorption capability of the CNTs improved the sensitivity of the sensing materials. Both of the two points mentioned above significantly improved the lower detection limit of fluorescence sensing as expected. As the resultant byproduct of Cu2+-contaminated 1,4-DHAQ-doped CNTs@CL nanofibrous membranes showed recovered fluorescence by extra addition of Cr3+ in solution, 1,4-DHAQ and Cu2+ co-doped CNTs@CL (denoted as 1,4-DHAQ/Cu2+ co-doped CNTs@CL) microporous nanofibrous membranes were further fabricated for the fluorescence enhancement detection of Cr3+ in aqueous solution. It was found that the fluorescence intensity of the 1,4-DHAQ-doped CNTs@CL nanofibrous membranes linearly decreased with Cu2+ concentration in the range of 0–2.2 × 10−8 M, while that of the 1,4-DHAQ/Cu2+ co-doped CNTs@CL nanofibrous membranes linearly increased with Cr3+ concentration in the range of 0–2.4 × 10−8 M. The excellent fluorescence sensing properties of the 1,4-DHAQ-doped CNTs@CL and 1,4-DHAQ/Cu2+ co-doped CNTs@CL nanofibrous membranes for Cu2+ and Cr3+ were further demonstrated by using polluted lake waters, proving their potential applications in environmental monitoring areas. The design concept mentioned in this work might also open a door to the design of other effective fluorescence probes with high sensitivity.
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POLYMER SCIENCE SERIES A
·
2021
·Vol. 63
·期 6
·815-821
·
IF 1.206
Huang Xinmin,Yang Lianhe,Meng Lingling,Qiu Tingting
Abstract This study investigated the effects of loadings of cellulose nanofibers extracted from jute fibers on the tensile property, onset temperature, melting temperature, crystallization temperature, and thermal stability of polyvinyl alcohol matrix. The synthesized nanocomposites were characterized by scanning electron microscopy, Fourier transform infrared spectrometry, tensile tests, dynamic mechanical analysis, differential scanning calorimetry, and thermogravimetric analysis. Experimental results showed that there is an increase in both the modulus and strength of the composite films up to 10% cellulose nanofibers loading and a gradual decrease with further increases to 30% cellulose nanofibers loading. In addition, the thermal degradation of the composites occurs at higher temperature than that of both cellulose nanofibers and neat polyvinyl alcohol. However, thermal stability of the composites decreases with increase of the cellulose nanofibers content higher than 20 wt %.
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Polymers
·
2022
·Vol. 14
·期 11
·2286
·
IF 4.967
Meiyan Wu,Wangfang Deng,Yidong Zhang,Chao Chen,Zhexuan Liu,Pedram Fatehi,Bin Li
It is highly desirable to develop a safe, highly efficient, and biodegradable drug carrier with an enhanced drug transport efficiency. Cellulose nanofibrils (CNF) and chitosan (CS) composite hydrogels are promising candidate carriers with biological compatibility and non-cytotoxicity. Herein, the CNF/CS composite beads were prepared by dissolving cellulose and CS in LiBr molten salt hydrate and regenerating in ethanol. This preparation method is facile and efficient, and the obtained porous CNF/CS beads with the weight ratio of 8:2 exhibited a large specific surface area, uniform micro-nano-sized pores, strong mechanical property, and water absorption-resistance. Moreover, these beads as drug (tetracycline hydrochloride, TH) carriers showed a higher encapsulation efficiency (47.4%) at the TH concentration of 5 mg/mL in 24 h, and a higher drug loading rate (12.0%) than pure CNF and other CNF/CS beads prepared with different ratios. In addition, the TH releasing behavior of CNF/CS (8:2) beads fitted well into the zero-order, first-order, and Higuchi models under an acid condition, indicating that the drug release of these pH-sensitive beads was mainly affected by drug concentration under an acid condition. Therefore, these CNF/CS beads have great potential to be used as drug carriers for medical applications.Keywords:cellulose nanofibrils;chitosan;drug carrier;tetracycline hydrochloride;drug release
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高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2021
·Vol. 31
·期 2
·1096-1107
·
IF 1.819
Sheng Dezun,Zhou Jinxi,Zhang Hongdun,Tian Haitao,Liu Xicai,Qi Xuelian,Zhang Huichen,Wang Weiwei
The hydroxyethyl cellulose (HEC) is a biocompatible and nonperishable natural compound, which makes it an ideal additive for achieving super-low friction in hydration lubrication. In this work, ultra-polished quartz glasses were used as friction pairs with a contact area as large as 50.24 mm 2 . The lubrication behavior of HEC solutions was studied and the topology of the friction pairs was investigated. A super-low COF of 0.0012 was achieved under lubrication of 1.00 wt.% HEC. Increasing or decreasing the dosage of HEC will lead to defective lubrication. Dehydration tests have shown that saturated salts compete for the water of the hydrated HEC and destroy the lubricating film, demonstrating the importance of hydration in achieving super-low lubrication. The XPS spectra of quartz and quartz covered with lubricant indicate that there is no chemical interaction between the quartz and HEC during the friction. However, a negative shift in the peak of O 1s lines were detected, suggesting that physical adsorption of the oxygen atoms occurs at the interface between the quartz and the lubricant. The lubrication regime was analyzed by Hamrock-Dowson theory and the ratio λ is around 1.7–24.5, which suggested that the lubrication regime was mixed lubrication or hydrodynamic lubrication. According to the experiments and discussions, possible lubrication models are proposed for HEC lubricants with different concentrations, which can contribute to the development of new hydration lubricants with superlubricity properties and are of great importance for scientific exploration and engineering applications.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 10
·2797-2806
·
IF 3.186
Dong Yuxiao,Tong Dongshen,Ren Laibin,Chen Xingtao,Zhang Hao,Yu Weihua,Zhou Chunhui
Abstract Kaolinite, a natural, layered phyllosilicate, has been used as the solid catalyst for the hydrolysis of cellulose in our previous work. In the present study, kaolinite was activated by mineral acid and further evaluated for the hydrolysis of cellulose in water. The acid-activated kaolinite was characterized by XRF, XRD, FT-IR, BET and TG. The effects of reaction temperature, reaction time, mass ratio and water amount were investigated in the system. It was found that the highest total reducing sugars (TRS) yield of 50.2% was obtained on the kaolinite activated by 20% HNO 3 with the mass ratio of catalyst to cellulose of 0.2 and water to cellulose of 14 at 205 ℃ for 3 h. Moreover, the catalyst was easily regenerated by calcination and the yield of TRS on the regenerated catalyst changed between 50.2% and 45.2% after four times reuse. The results showed that the acid activation could influence the crystallinity and improve the specific surface area, but the high TRS yield of the activated kaolinite should be ascribed to the increasing of the interlayer Al–OH groups and the formation of inner hydrogen bonds between the octahedral sheets and tetrahedral sheets. Finally, it was suggested that this was the effective way for improving the catalytic performance by increasing the interlayer Al–OH groups on the kaolinite catalyst. Graphic Abstract
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Desalination and Water Treatment
·
2016
·
IF 1.272
Manfeng Li,Zhaomei Wang,Bingjie Li
A cellulose/chitosan hydrogel bead was prepared by extruding and regenerating the blends from ionic liquid 1-ethyl-3-methylimidazolium acetate ([Emim]Ac) in ethanol. FT-IR, scanning electron microscopy (SEM) and X-ray powder diffraction techniques were used to prove the successful blending of both natural polymers (cellulose and chitosan). Brunauer–Emmet–Teller surface area and pore diameter analysis showed that the beads were nanoporous with pores measuring from 10 to 20 nm. Batch adsorption experiments demonstrated that the bead had a maximum adsorption capacity of 40 mg/g for congo red (CR) dye removal from aqueous solutions, which was more efficient than the most reported natural biosorbents. The CR adsorption capacity at equilibrium was related to initial CR concentration, dosage of beads and pH values of the CR solution. When the initial concentration of CR was 30 mg/L, and the adsorbent dosage was 2.0 g/L, the equilibrium of adsorption was reached within 115 min with the removal rate of 89.6%. The Langmuir model represented the adsorption isotherm data and the experimental results followed a pseudo-second-order rate model, indicating that intraparticle diffusion dominated the adsorption process. The cellulose/chitosan hydrogel beads can be used as an efficient adsorbent for dye contaminant removal from wastewater.
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高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2022
·Vol. 37
·期 2
·300-310
·
IF 1.595
Jin-Jie Zhang,Ying-Ping Qi,Yong-Feng Shen,Hua Li
Paper cultural relics are both precious, inheritable and fragile. However, with the passage of time, paper will also be affected by a variety of factors, and will appear mildew, yellow, brittle, or even completely damaged. In order to protect the cultural relics, extend lifespan paper, CMC-acrylate-OVPOSS graft copolymerization emulsion was synthesized by using carboxymethyl cellulose (CMC) as substrate, methyl methacrylate (MMA), butyl acrylate (BA), glycidyl methacrylate (GMA), hydroxyethyl methacrylate (HEMA), octavinyl polyhedral oligomeric silsesquioxane (OVPOSS) as graft copolymer. The CMC-acrylate-OVPOSS emulsion was coated on the surface of the paper to test its protective effect on the paper. The results showed that the mass concentration of 10 % reinforcement solution coated on the paper, mechanical properties of paper were greatly improved, and the gloss and whiteness of paper were slightly changed, the paper also had a certain aging resistance and acid and alkali corrosion resistance. At the same time, the reversibility experiment showed that the reinforcement material had a certain reversibility.
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SOFT MATERIALS
·
2022
·
IF 1.619
Yan Bai,Shuaihang Bi,Weikang Wang,Ning Ding,Yuyuan Lu,Mengyue Jiang,Chengbo Ding,Weiwei Zhao,Ning Liu,Jing Bian,Shujuan Liu,Qiang Zhao
With the booming growth of flexible human-computer interactions and telecommunications, it is desirable to fabricate a high-sensitivity strain sensor to monitor human movement and develop an electromagnetic interference (EMI) shielding materials to protect modern microelectronics and humans from electromagnetic damage. Herein, the biocompatible, stretchable, and compressible cellulose/MXene hydrogel has been prepared to first realize the dual-functional applications in strain sensor and EMI shielding. Two-dimensional MXene nanosheets serve as conductive sensing materials and fillers to construct conductive networks. The hydrogen bond interaction between them enhances the mechanical property of hydrogel. Benefiting from the excellent electrical conductivity and good mechanical property of the cellulose/MXene hydrogel, the resultant strain sensor displays excellent tensile strain (~144.4%), high sensitivity (gauge factor ~ -6.97), adjustable detection range (0-68.7%), fast response time (~100 ms), and great stability (~1000 cycles). It can monitor human motion, including pulse beating, speech recognition, writing sensing and pressure distribution induction of 4 × 4 sensor array platform. Moreover, the cellulose/MXene hydrogel presents an absorption-predominant EMI shielding performance in the frequency of X-band. This work provides a new inspiration for the development of multifunctional hydrogel in artificial intelligence, human-computer interaction, and EMI shielding technique.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Yanxia Chao,Huichang Gao,Xiang Zhu,Huibin Wang,Zhuohong Yang,Wuyi Zhou,Yaozong Li,Huangwei Chen,Yu Yang,Yang Hu
The multifunctional biocompatible hydrogels have attracted widespread attention in biomedical applications such as the fields of biomimetic tissues, wound dressings and biosensors. But it is a great challenge to facilely develop a hydrogel with favorable mechanical strength, adhesion performance, anti-swelling behavior, antibacterial activity and biocompatibility at the same time. Inspired by the mechanical reinforcement mechanism of double network and nanocomposite hydrogels as well as the adhesion mechanism of mussel, tannic acid-coated cellulose nanocrystals (TA@CNC)/pectin/polyacrylic acid nanocomposite hydrogels (TPP hydrogels) are reported in this work. The obtained TPP hydrogels exhibited high stretchability with the fracture strain of more than 1400%, and excellent elasticity and fatigue resistance. Additionally, the abundant catechol groups on TA@CNC nanoparticles endow TPP hydrogels with good adhesiveness and can adhere to various hydrophilic and hydrophobic substrates such as wood, glass, polytetrafluoroethylene and biological tissues. Moreover, TPP hydrogels also exhibited the significant anti-swelling properties expressed that the equilibrium swelling ratio of the tested TPP hydrogel was only 19.25% as much as that of the polyacrylic acid hydrogel. In addition, TPP hydrogels displayed favorable antibacterial properties against Escherichia coli and Staphylococcus aureus , and can effectively support the adhesion, growth and proliferation of mouse fibroblasts for showing cytocompatibility. All the results imply that TPP hydrogels have promising potential in biomedical application.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Nan Sun,Zhaofeng Wang,Ying Xu,Jie Cong,Jia Li,Long Bai,Pengfei Huo,Zhiguo Li,Yang Liu
Inspired by the self-recoverability ability of organisms, various self-healing materials have been developed. However, most reinforced fillers are faced with the problem that mechanical strength and self-healing efficiency of materials cannot be improved simultaneously. Here we first prepared new polysiloxane-polyurea (PDMS-PU) and used it as matrix resin to prepare cellulose nanofiber (CNF)/PDMS-PU composite materials with high mechanical properties. CNFs increased the tensile strength of PDMS-PU by 38.87 % and CNF/PDMS-PU composite materials maintained the great bending resistance, transparency and reprocessing properties of PDMS-PU. Moreover, the introduction of CNFs did not reduce the self-healing efficiency of PDMS-PU, and PDMS-PU containing disulfide bonds with CNF content of 1 % (CNF/PDMS-IPDI-S-1 %) with healing efficiency of 95.58 %, and the tensile strength after three recycling processing was still as high as 92.55 % of the original. CNFs reinforced PDMS-PU composite materials are expected to replace PDMS materials in advanced engineering fields that require high strength durability and good formability.
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高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Ke Li,Xiao Zhang,Chen Du,Jinwan Yang,Bolang Wu,Zhiwei Guo,Conglin Dong,Ning Lin,Chengqing Yuan
With the increasing requirement of environmental protection, the development of lubricating materials with non-toxicity and good biodegradability becomes more and more significant. As the novel green nanomaterial derived from natural cellulose, cellulose nanocrystals (CNCs) in the present work were prepared from native cotton and added into polyalphaolefin (PAO) base oil as the lubricant additive. To improve the compatibility of CNCs with PAO, the surface of CNCs were grafted by stearoyl chains, which entangled with polyolefin chains and led to a good dispersibility and stability of the colloidal solution. This hybrid oil with the elevated viscosity improved the formation of lubricant film in the boundary lubrication regime. Combining with the mending effect of CNC particles on the surface roughness and scars, both the friction and the wear were dramatically reduced. Specifically, the introduction of 2 wt% modified nanocrystals (mCNC) in PAO base oil reduced the coefficient of friction (COF) by 30%. The results of this study suggest that cellulose nanocrystal is a promising ecofriendly and effective lubricant additive.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Yangyang Han,Xiaodong Wu,Xinxing Zhang,Zehang Zhou,Canhui Lu
A novel and straightforward synthetic strategy was developed to prepare silver nanoparticles-doped cellulose microgels (Ag NPs@CMG) nanohybrids at room temperature. Residual alkali (sodium hydroxide/urea) from a cellulose dissolving system was reused and acted as a functional accelerant, which made it possible for Ag+ to be reduced to Ag0 by CMG at room temperature, yielding Ag NPs decorated on CMG. The as-prepared Ag NPs@CMG nanohybrids exhibited excellent catalytic performance in reduction of 4-nitrophenol and organic dyes. Moreover, the Ag NPs@CMG nanohybrids were capable to form a desirable porous membrane for catalyzing and simultaneous product separation. Reactants passing through the membrane could be catalytically transformed to product, which is of great significance for water treatment. As a demonstration, three kinds of organic dye solutions were successfully decolorized by using a Ag NPs@CMG nanohybrids-based membrane. The simplicity, sustainability, and straightforwardness of this approach to prepare a highly efficient catalyst and functional membrane open up new possibilities for large-scale production and application of bioresources/noble metal nanohybrids in various fields.
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高影响因子
危险品化学品经营许可证（带存储）