NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 1
·330-337
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IF 3.201
Chaoping Yuan,Wentao Shi,Peng Chen,Huaxin Chen,Lihua Zhang,Gang Hu,Longming Jin,Haibo Xie,Qiang Zheng,Shengjun Lu
Cellulose dissolution is crucial for its regeneration and the application of its derivative materials. In this study, the dissolution of cellulose in γ-valerolactone (GVL), promoted by 1-ethyl-3-methylimidazolium acetate ([Emim]OAc), was investigated and 15 wt% α-cellulose was rapidly dissolved by the designed mixed organic electrolyte solvents (OESs) at 80 °C in 1 h. The rheological study indicated that the activation energy of dissolution is lower than that in pure [Emim]OAc, and the overlap concentration was determined to be C* = 1.7 wt%. The viscosity of the α-cellulose solution overlapped well with the complex viscosity, suggesting that the Cox–Merz law is valid therein. The potential of the solution for homogeneous derivatization through transesterification of α-cellulose with vinyl esters was also investigated at 80 °C in 4 h with a low vinyl ester/anhydroglucose unit (AGU) molar ratio of 3, achieving a cellulose laurate ester with a DS = 3.0, cellulose pivalate ester with a DS = 3.0 and cellulose chloroacetate ester with a DS = 1.43.
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高影响因子
COMPOSITES COMMUNICATIONS
·
2018
·
IF 0
Cheng Duan,Qiuxia Fu,Yang Si,Lifang Liu,Xia Yin,Feng Ji,Jianyong Yu,Bin Ding
Fabricating metal-chelating affinity materials with excellent protein adsorption and isolation properties is of great significance in numerous biotechnological fields, yet still face huge challenges. Herein, we successfully developed a new kind of nanofiber based metal-chelating affinity membranes by orderly modifying the electrospun regenerated cellulose nanofibrous membranes (RC NFMs) with intermediate bridging agent of cyanuric chloride (CC), chelating agent of iminodiacetic acid (IDA) and affinity ligand of Fe 3+ ions. The resultant Fe 3+ ions immobilized RC NFMs (RC-CC-IDA-Fe 3+ NFMs) exhibited a high lysozyme adsorption amount of 365 mg g -1 within the fast equilibrium adsorption time of 4 hours. Meanwhile, the performance of RC-CC-IDA-Fe 3+ NFMs could be facilely regulated by controlling the properties and concentration of protein solutions. Moreover, the obtained nanofibrous affinity materials also possessed superior cycle performance and excellent regeneration ability. Undoubtedly, the successful fabrication of efficient RC-CC-IDA-Fe 3+ NFMs might provide a new kind of affinity adsorbent for protein purification and other potential biotechnological fields.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 46
·48221
·
IF 2.188
Sakil Mahmud,Yu Long,Muhammad Abu Taher,Zhu Xiong,Ruoyu Zhang,Jin Zhu
Polylactide (PLA) is a bio-based polymeric material which is earth abundant in nature. It also possesses abundant strength and stiffness making it a promising material for industrial applications. However, its brittle behavior is currently limiting research work on them. As such, an eco-friendly blending approach is developed in this study in order to fabricate a ductile and toughen PLA composites using renewable bio-based materials as a precursor. Specifically, PLA, epoxidized soybean oil (ESO), and frangible powder form of cellulose nanocrystals (CNCs) are melt blended to prepare the ternary composite system (PLA/CNC/ESO). During the composite routing, it is found out that the ESO successfully attached to the surface of CNC which in turn results in CNC/ESO mixtures in the PLA matrix. This intrinsic combination induces cavitation which consumes the energy produced under the stretching and impacting, resulting in the turning of the PLA's brittle phenomenon. In fact, a reasonable increase in the ductility is observed. The elongation and notched impact strength of the ternary nanocomposite are found to be ∼32% and ∼4.8 kJ m −2 , respectively, which are comparatively higher than that of neat PLA or PLA/CNC composites. Differential scanning calorimetry analyses show that the ESO layer on CNC affects the thermal characteristics of PLA in the ternary composite while thermogravimetric analysis shows that there is an increase in the char yield of the composite. Furthermore, scanning electron microscopy analysis shows that the synthesis approach adopted here enables a mechanistically turning of the PLA's brittle phenomenon to ductile. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48221.
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高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 10
·800
·
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
Polymers
·
2018
·Vol. 10
·期 12
·1392
·
IF 2.935
Wenyan Li,Shengchang Lu,Mengchan Zhao,Xinxing Lin,Min Zhang,He Xiao,Kai Liu,Liulian Huang,Lihui Chen,Xinhua Ouyang,Yonghao Ni,Hui Wu
Self-healing gels based on reshuffling disulfide bonds have attracted great attention due to their ability to restore structure and mechanical properties after damage. In this work, self-healing gels with different cellulose nanocrystals (CNC) contents were prepared by embedding the thiuram disulfide bonds into gels via polyaddition. By the reshuffling of thiuram disulfide bonds, the CNC-containing gels repair the crack and recover mechanical properties rapidly under visible light in air. The thiuram disulfide-functionalized gels with a CNC content of 2.2% are highly stretchable and can be stretched approximately 42.6 times of their original length. Our results provide useful approaches for the preparation of dynamic CNC-containing gels with implications in many related engineering applications.Keywords:cellulose;disulfide;gel;self-healing
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 58
·33129-33137
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IF 2.936
Aphra Agaba,Huan Cheng,Jiangbin Zhao,Congcong Zhang,Mike Tebyetekerwa,Liduo Rong,Xiaofeng Sui,Bijia Wang
Silicon-containing compounds such as silica are effective heavy metal sorbents which can be employed in many applications. This is attributed to the porous nature of hydrothermally-stable silica, endowing such materials with high surface area and rich surface chemistry, all responsible for improving adsorption and desorption performance. However, to this day, the wide application of silica is limited by its skeletal brittleness and high production cost coupled with a risky traditional supercritical drying method. To solve the named problems, herein, precipitated silica agglomerates (referred to as PSA) was crosslinked with TEMPO-oxidized cellulose nanofibrils (TO-CNF) as a reinforcement in the presence of 3-aminopropyltriethoxysilane (APTES), via a facile dual metal synthesis approach, is reported. The resultant new silica-based sponges (TO-CNF PSA) showed desirable properties of flexibility, porosity and multifaceted sorption of various heavy metals with re-usability. The experimental results showed maximum adsorption capacities of 157.7, 33.22, 140.3 and 130.5 mg g−1 for Pb(II), Hg(II), Cr(III) and Cd(II) ions, respectively. Such a facile approach to modify silica materials by attaching active groups together with reinforcement can provide improved and reliable silica-based materials which can be applied in water treatment, gas purification, thermal insulation etc.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Lin Wang,Lizhuan Lin,Xiaohan Chen,Cailing Tong,Jie Pang
To development of konjac glucomannan (KGM) based films for use in food packaging is increasing because of environmental attraction, biodegradability and availability. The objective of this research was to prepare a facile approach for KGM based films. Polydopamine (PDA) functionalized microcrystalline cellulose (PFMC) were incorporated into a KGM matrix. The KGM/PFMC films were prepared by the solvent casting method. The surface morphology of the KGM/PFMC films were generated by scanning electron microscope (SEM) and atomic force microscope (AFM). The crystal structure and thermal ability of the film were generated by X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Rheological behavior, elemental and characteristic peak changes were developed by rheology, X-ray photoelectron spectroscopy (XPS) and fourier infrared spectroscopy (FT-IR). Incorporation of PFMC increased the mechanical properties owing to the high ratio (0.2 g) of PFMC and strong interactions with the KGM. Water vapor permeability (WVP) of the films were significantly decreased. Moreover, PFMC also gave KGM/PFMC films high thermal stability. The results suggest that that KGM/PFMC film is a promising food packaging material.
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 5
·2977-2986
·
IF 3.809
Wu Hao,Teng Chao,Tian Huafeng,Li Yanru,Wang Jianguo
Cellulose nanocomposite membranes with predesigned functions were prepared and evaluated as adsorbents for protein adsorption. Maghemite nanoparticles (MNP) with amino groups and carboxyl groups were obtained by modifying maghemite nanoparticles with glycine and sodium citrate, respectively. The functional maghemite nanoparticles were then dispersed into NaOH/urea aqueous solution for dissolving cellulose, and the magnetic membranes were constructed using a tape casting method. The modified MNP were evaluated by zeta potential and FTIR measurements. The developed cellulose nanocomposite membranes possess microporous structure with porosity higher than 88.3%. The introduction of MNP with carboxyl groups into the cellulose nanocomposite membranes could absorb the highest amount of protein at a pH of 4, and gradually decreased with the increase of pH from 4 to 6. However, cellulose nanocomposite membranes with introduced MNP with amino groups absorb the highest and lowest amount of protein at pH of 5 and 4, respectively. This study provides a green and simple method for the design of multifunctional cellulose nanocomposite membranes for controllable protein adsorption, and is expected to open new venues for biomolecule binding by choice of various nanofillers and pH of the medium.
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高影响因子
DESALINATION
·
2013
·
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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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2013
·Vol. 169
·期 6
·1811-1821
·
IF 1.893
Wang Ting,Li Bin,Lin Li
A novel functional material of β -cyclodextrin ( β -CD) grafting cellulose beads containing immobilized silver nanoparticles (AgNPs) is presented in this paper. The morphology was characterized by scanning electron microscopy, energy-dispersive X-ray, and X-ray photoelectron spectroscopy. Phenolphthalein probe molecule technique was used to detect the activity of the grafting β -CD, and the results demonstrated that the deposition of AgNPs had no influence on its encapsulation ability. Acid resistance of the AgNPs on the bead material was studied by atomic absorption spectrometry. The stability of the AgNPs was enhanced due to the grafting of β -CD. Tube dilution method was applied to study the bacteriostatic effect, and the minimal inhibitory doses of the novel material against Escherichia coli and Staphylococcus aureus were 12.5 and 25 mg, respectively. The minimal bactericidal doses for the two bacteria were 25 and 25 mg, respectively.
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高影响因子
CELLULOSE
·
2013
·Vol. 20
·期 2
·841-848
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IF 3.476
Huo Jiansheng,Zheng Yuhui,Pang Shuting,Wang Qianming
In this paper, a novel luminescent hydrogel was successfully prepared by incorporating Tb-HSA (HSA = Human Serum Albumin) complex into cellulose host. The green luminescence intensities of Tb(III) exhibited on – off changes in terms of pH variation. At the same time, europium activated phosphor (GdVO 4 :Eu 3+ ) was immobilized into the cellulose hydrogels through two approaches. The photophysical properties of luminescent gels with the temperature variation were investigated by fluorescence. The new group of soft materials will display task-specific usages in sensing fields.
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高影响因子
Journal of Materials Chemistry B
·
2014
·Vol. 3
·期 4
·620-628
·
IF 0
Xilun Weng,Zongbi Bao,Zhiguo Zhang,Baogen Su,Huabin Xing,Qiwei Yang,Yiwen Yang,Qilong Ren
Organic–inorganic hybrids incorporating cellulose tris(3,5-dimethylphenylcarbamate) (CDMPC)-functionalized silica particles can exhibit a high loading capacity with high loadings of the chiral selector. These materials offer considerable potential for use in preparative chiral separations. However, the preparation of these hybrid particles with high surface areas and controlled organic/inorganic ratios is challenging. We have found that by controlling the pH of sol–gel step and regulating the ratio of the inorganic precursor over CDMPC, unique functional hybrid particles could be prepared with optimum pore structure, novel interfacial features and excellent mechanical strength. The morphological features of these hybrid particles were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The organic content was determined by thermogravimetric analysis (TGA) and pore structure determined by Brunauer–Emmett–Teller (BET) analysis. These new hybrid particles exhibit excellent solvent durability, which is crucial for preparative chromatography. HPLC analysis of columns, packed with this material, confirmed solvent tolerance such as for chloroform, giving potential applications for large scale chromatographic separations.
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