POLYMER BULLETIN
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2017
·Vol. 75
·期 1
·77-91
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IF 1.43
Zhu Qiyu,Teng Jianying,Liu Xuan,Lan Yong,Guo Rui
In this study, a kind of antibacterial collagen (Coll)/cellulose nanocrystals (CNCs) scaffolds was prepared and characterized, which can be applied in skin trauma as a promising dressing. In order to achieve the goal of antibacterial function for a period of long time, the Gentamycin sulfate (GS) was absorbed in the prepared gelatin microsphere (GMs) then doped in the porous Coll–CNCs freeze-drying scaffold. The CNCs had a width of 20–40 nm and length of 150–350 nm from electron microscopy (TEM), retained the basic chemical structure of cellulose observed from Fourier transform infrared, and increased the machinery properties of Coll scaffold from thermal property analysis. From the SEM, the mean pore size of the compound scaffolds was about 120 μm with or without GMs. The in vitro release profile of GS showed a sustained release of this GS/GMs/Coll–CNCs composite scaffold. The biological compatibility experiments showed the composite scaffold low cellular cytotoxicity of NIH-3T3 cells. The significant inhibition zones indicated the antibacterial efficacy of the composite scaffold against Escherichia coli and Staphylococcus aureus .
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E-POLYMERS
·
2017
·Vol. 17
·期 4
·333-340
·
IF 0.949
Jun Song,Mei Liu,Zhanping Yang,Songwei Xu,Bowen Cheng,Pengfei Fei
Commercial cellulose diacetate with a degree of substitution (DS) of 2.45 was partly deacetylated to cellulose acetate (CA) with different DSs by acid-catalyzed hydrolysis and then reacted with 1-naphthoyl chloride (NpCl) to synthesize CA naphthoate (CANp). Fourier transform infrared and 1 H-NMR were used to characterize the chemical structure of CANp. The DS of naphthoate moiety (DS CANp ) could be varied from 0.18 to 0.98 by adjusting the molar ratio of –OH in CA unit to NpCl, the DS of CA (DS CA ), and the reaction time and temperature. When DS CA was 2.01 and the molar ratio was 1:6, the maximum DS CANp of the product was achieved after a reaction at 80°C for 2 h. With the increase of DS CANp , the thermal stability decreased slightly whereas the anti-ultraviolet property was enhanced. Moreover, the obtained films containing CANp exhibited good ultraviolet resistance as well as chemical resistance.
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ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Lirong Tang,Tao Li,Senyang Zhuang,Qilin Lu,Pengfei Li,Biao Huang
Fluorescent labeled nanoparticles are expected to have potential applications in biological and imaging systems. In this study, in order to construct the fluorescent nanoparticles for pH-sensing, l-leucine amino acid is used as a spacer linker between cellulose nanocrystals (CNCs) and a pH-indicator dye (5 (and 6)-carboxy-2′,7′-dichlorofluorescein, CDCF). Characterization by Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), and X-ray photoelectron spectroscopy (XPS) is adopted to follow the chemical modification, whereas the morphology is determined by atomic force microscopy (AFM). The crystallinity determined by NMR for the CNCs, A-CNCs, and F-A-CNCs is 78.32, 79.84, and 79.52, respectively. The quantitative analysis by elemental analysis revealed that the degree of cellulose hydroxyl group substitution (DS) of A-CNCs and F-A-CNCs is 0.05 and 0.27, respectively. According to the obtained results, CDCF fluorescein could be successfully labeled onto CNCs via l-leucine amino acid spacer linking, and the cellulose structure is stable during the labeling reaction. The fluorescent properties of the yielding pH-sensitive fluorescent CNCs (F-A-CNCs) are characterized by fluorescence spectrometer and imaged by confocal laser scanning microscopy (CLSM). The result shows that the fluorescence intensity of F-A-CNCs increases with increasing pH of the buffer from 2.28 to 10.84.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Chaofan Ding,Yue Li,Yanhui Wang,Jianbo Li,Yuanling Sun,Yanna Lin,Weiyan Sun,Chuannan Luo
Magnetic hydroxyethyl cellulose/ionic liquid (MHEC/IL) materials were fabricated through a facile and fast process and their application as excellent adsorbents for hydroquinone was also demonstrated. The thermal stability, chemical structure and magnetic property of the MHEC/IL were characterized by the Scanning electron microscope (SEM), Transmission Electron Microscope (TEM), Fourier transform infrared spectrometer (FT-IR) and X-ray diffraction (XRD), respectively. The adsorbents were used for the removal of hydroquinone from simulated wastewater with a fast solid–liquid separation in the presence of external magnetic field. The influence of various analytical parameters on the adsorption of hydroquinone such as pH, contact time and initial ion concentration were studied in detail. The results showed that the maximum adsorption capacity was 335.68 mg g −1 , observed at pH 5 and temperature 30 °C. Equilibrium adsorption was achieved within 30 min. The kinetic data, obtained at the optimum pH 5, could be fitted with a pseudo-second order equation. Adsorption process could be well described by Freundlich adsorption isotherms. The obtained results indicated that the impregnation of the room temperature IL significantly enhances the removal efficiency of hydroquinone. The MHEC/IL may be suitable materials in phenols pollution cleanup if they are synthesized in largescale and at low price in near future.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Juncheng Ma,Xueqin Wang,Qiuxia Fu,Yang Si,Jianyong Yu,Bin Ding
Construction of adsorptive materials for simple, efficient, and high-throughput adsorption of proteins is critical to meet the great demands of highly purified proteins in biotechnological and biopharmaceutical industry; however, it has proven extremely challenging. Here, we report a cost-effective strategy to create carbonyl groups surface-functionalized nanofibrous membranes under mild conditions for positively charged protein adsorption. Our approach allows maleic anhydride to in situ graft on cellulose nanofibrous membranes (CMA) to construct adsorptive membranes with large surface area and tortuous porous structure. Thereby, the resultant CMA membranes exhibited high adsorption capacity of 160 mg g–1, fast equilibrium within 12 h, and good reversibility to lysozyme. Moreover, the dynamic adsorption was performed under low pressure-drops (750 Pa), with a relatively high saturation adsorption amount of 118 mg g–1, which matched well with the requirements for proteins purification. Considering the excellent adsorption performance of the as-prepared adsorptive membranes, this simple and intriguing approach may pave a way for the design and development of robust and cost-effective adsorption membranes to meet the great demands for fast and efficient adsorption of positively charged proteins.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 38
·
IF 1.768
Chengying Jia,Junlong Song,Yongcan Jin,Orlando J. Rojas
We report a facile method to synthesize hollow silica microtubes (SMTs) from electrospun cellulose acetate fiber precursors. Specific surface areas of up to 765 m 2 /g (Brunauer–Emmett–Teller) were measured for the SMTs, which had a typical wall thickness of ∼100 nm and submicron inner diameters. An average pore size of 4.6 nm and pore volume of 0.41 cm 3 /g were derived from Barrett–Joyner–Halenda fitting, whereas Horvath–Kawazoe pore size distribution analysis revealed microporous median pore size and maximum pore volume of 0.7 nm and 0.18 cm 3 /g, respectively. The as-prepared SMTs featuring micro- and mesoporous structures in the walls where amino-functionalized to facilitate a very high drug loading (15% by weight). Drug release profile revealed sustained release rates (79% of acetylsalicylic acid was released after 6 h). It is concluded that the high drug loading and sustained release resulted from the advantageous integration of SMTs' hollow structure and wall mesoporosity. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42562.
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CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Jing Wang,Xuesong Zhou,Huining Xiao
Semi-interpenetrating polymer network (SIPN) strategy was employed to fabricate a kind of novel hydrogels composed of cellulose and poly( N -isopropylacrylamide) (PNIPAAm) in the presence of N , N ′-methylenebisacrylamide (MBAAm) as the crosslinker and benzoyl peroxide (BPO) as the initiator. The results from FTIR and TGA indicated that the network indeed existed in the SIPN hydrogels. The data from experiments, those related to the swelling behavior of the hydrogels at different temperatures in particular, demonstrated the thermal sensitivity of these hydrogels. The impact of crosslinker content on the hydrogel properties was discussed as well. The swelling ratio of hydrogels decreased with increasing the content of MBAAm. Besides, the loading and releasing behavior of the hydrogels were examined using dimethyl methylene blue as a model drug. These novel hydrogels combining the advantages of natural polymer with thermal responsive behavior are of great potential to be applied to drug delivery and control release systems.
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PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 11
·1351-1355
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IF 1.757
Deming Zeng,Jian Lv,Chun Wei,Chuanbai Yu
Sisal is a natural material and a potential additive to reinforce composites. In this paper, sisal fiber cellulose microcrystalline (SFCM) was obtained from sisal fiber, and SFCM/unsaturated polyester (SFCM/UPR) in-situ resins were prepared via in-situ polymerization. Moreover, SFCM/UPR composites were produced with methods of rolling and molding. Effect of SFCM on dynamic mechanical properties of composites was studied. It is demonstrated that SFCM could significantly improve the dynamic mechanical properties of composites; the effect is closely related with the amount of SFCM, its dispersion in UPR matrix, and interfacial interaction. When the content of SFCM was 3 wt%, at 50°C, the storage modulus of SFCM/UPR composite was 33.22% higher than that of pure UPR. In addition, the glass transition temperature (T g ) was shifted to a higher temperature by 7.5°C, and loss modulus was decreased by 16.24%. The equilibrium value of relaxation modulus at 120 min was 30.52% higher than that of pure UPR composite. Besides, the equilibrium value of creep strain at 120 min was decreased by 41.61% compared with pure UPR composite. Copyright © 2015 John Wiley & Sons, Ltd.
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COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 293
·期 3
·963-974
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IF 2.41
Liu Hongxia,Geng Simin,Hu Panpan,Qin Qianyi,Wei Chun,Lv Jian
Sulfonated cellulose nanowhiskers (sulfonated CNWs), a kind of needle-like colloidal particles, could be obtained through sulfuric acid hydrolysis of microcrystal cellulose extracted from sisal fibers. Here, stable Pickering emulsions were prepared using the sulfonated CNWs as a stabilizer. The effects of the sulfonated CNW concentration in aqueous phase, volume ratio of water to oil, oil type, and the pH value on the stability, type, and morphology of these emulsions were investigated. The average droplet size decreases with increasing sulfonated CNW concentration and volume ratio of water to oil. Many types of oil phase were stabilized by sulfonated CNWs to form stable oil-in-water (o/w) Pickering emulsion only by adjusting the pH value of water phase. In addition, poly(methyl methacrylate)PMMA/sulfnated CNW composite microspheres were fabricated by solvent volatilization of the as-prepared Pickering emulsion. Confocal laser scanning microscope (CLSM) and scanning electron microscope (SEM) studies confirmed that sulfonated CNWs adsorbed on the surface of the PMMA microparticles. With the interesting renewability and biodegradability of the sulfonated cellulose nanowhisker, these PMMA@sulfonated CNW composite microsphere could find great potential application in food, cosmetics, drug delivery, and biological tissue engineering, etc.
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COMPOSITE INTERFACES
·
2014
·
IF 0.701
Lian-zhen Ren,Peng-gang Ren,Xiao-liang Zhang,Zhen-feng Sun,Yuan Zhang
Regenerated cellulose (RCE)/poly(vinyl alcohol) (PVA) composite hydrogels were successfully prepared via physical repeated freezing and thawing method. The structure and properties of the RCE/PVA composite hydrogel were investigated by Fourier transform infrared spectrum, scanning electron microscopy, mechanical and swelling tests. The results revealed that a novel compact dual-network structure was formed between the cross-linked cellulose network and PVA matrix, which can strongly enhance the mechanical properties of the composite hydrogels as expected. Compared with neat PVA hydrogels, a 611% increase in tensile strength of RCE/PVA composite hydrogel from 0.09 to 0.64 MPa and 643% improvement in compressive strength from 0.07 to 0.52 MPa were achieved with the addition of 4 wt% of cellulose. The presence of cellulose is also beneficial to the elasticity of PVA hydrogels. With the incorporation of RCE, the composite hydrogels perform better shape recovery after compression test. Moreover, the addition of RCE has improved the swelling, water-absorbing, and water-retaining properties of the PVA hydrogels significantly.
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DESALINATION
·
2014
·
IF 3.96
Ling-Ling Shao,Quan-Fu An,Yan-Li Ji,Qiang Zhao,Xue-San Wang,Bao-Ku Zhu,Cong-Jie Gao
Sulfated carboxymethyl cellulose (SCMC) with tailored amount of sulfate groups was synthesized, and their composite nanofiltration membranes (SNFMs) were prepared by solution casting onto polysulfone (PSF) supporting membrane and crosslinking by glutaradehyde (GA). Chemical structure and composition of SCMCs and SNFMs were characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. SNFM surfaces were examined by field emission scanning electron microscopy , water contact angle and streaming potential measurement. The effects of the chemical composition on the hydrophilicity , the surface charge and the nanofiltration performance of SNFMs were determined. It is found that the incorporation of sulfate groups improves the water permeability of SNFMs while retaining their salt rejection. For the feed mixture of aqueous Na 2 SO 4 (1.0 g L − 1 , pH = 6.5), the optimum water flux is 39.6 L m − 2 h − 1 , which is 2.2 times of the pristine SNFM-0. For the xylenol orange (XO) dye solution (0.1 g L − 1 , pH = 4.0), the flux of SNFM-3 (30.0 L m − 2 h − 1 ) is also higher than that of SNFM-0 (11.1 L m − 2 h − 1 ). In addition, SNFM-3 exhibits good separation performance and chemical stability in treating saline anionic dye aqueous solution (MYB/NaCl) in acidic conditions.
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RSC Advances
·
2014
·Vol. 4
·期 86
·45753-45759
·
IF 3.708
Haiyan Wang,Yutong Gong,Yong Wang
Carbon aerogels have attracted considerable attention in fundamental investigation and potential applications in a myriad of fields. We present a novel approach for the synthesis of cellulose-based carbon aerogels by dissolution, gelation, regeneration, freeze-drying and carbonization of cellulose. The carbon aerogels obtained here possess the characteristics of high surface area (500 m2 g−1), hydrophobicity, and fire-resistance. In addition, the carbon aerogels show excellent adsorption capacity and selectivity for removal of oils, organic solvents, a variety of dyes, and heavy ions, so they could be used as promising adsorbents for sewage treatment. Especially for malachite green and Cu(II), the adsorption capacities can reach up to 1947 mg g−1 and 801 mg g−1, respectively, which far surpass other aerogels previous reported.
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