CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Xiao-kun Ouyang,Lijuan Zhao,Fangyuan Jiang,Junhong Ling,Li-Ye Yang,Nan Wang
Porous microsphere hemostatic materials, which possess rapid hemostatic, antibacterial, and wound healing-promotion properties, have key advantages over hemostatic dressings with a single hemostatic function. Using rod-shaped cellulose nanocrystals as the supporting framework, sodium alginate/cellulose nanocrystal porous microspheres (SA/CNC) were prepared using an inverse emulsion method. After SA/CNC self-assembly with the antibacterial polymer ε-polylysine, the hemostatic porous microspheres (PSLMs) showed high porosity, high liquid absorption capacity, and excellent coagulation properties. The in vitro and in vivo coagulation properties of PSLMs were evaluated and compared with those of the commercially available chitosan hemostatic powder. PSLMs had marked hemostatic effects in the following mouse hemorrhage models: caudal (81.20 s), liver (48.44 s), and femoral artery (71.66 s). After the introduction of ε-polylysine with excellent antibacterial properties to PSLMs, PSLMs effectively inhibited the activities of Escherichia coli , Staphylococcus aureus , and Pseudomonas aeruginosa .
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高影响因子
Food Packaging and Shelf Life
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2022
·
IF 8.749
Jingkun Zhao,Tao Liu,Kai Xia,Xin Liu,Xiaodong Zhang
In this paper, agar/gelatin (AG/GE) composite film modified by cellulose nanocrystals (CNC), agar/gellan gum (AG/GG) and agar/κ-carrageenan (AG/KC) composite films modified by CNC and calcium chloride were prepared and their properties were investigated. The results showed that the three prepared nanocomposite films exhibited dense and smooth surface structure, and their tensile strength (TS), elongation at break (EB) and light transmittance were larger than 60 MPa, 21 %, 80 % at 660 nm, respectively. Their water swelling rate (SR), water solubility (WS) and water vapor permeability (WVP) were lower than 155 %, 33 % and 6.8 × 10 −11 g m/m 2 Pa s, respectively. These three prepared films not only exhibited better comprehensive properties than those of the existing studies, but also possessed edible, good light transmittance and heat seal performance, especially, possessed better fresh keeping performance than plastic-based food packaging film when they were used to preserve strawberry through packaging or coating methods.
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CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Xiaojun Wang,Jinsong Zeng,J.Y. Zhu
Post-fibrillation endoglucanase treatment was employed to reduce the entanglement of cellulose nanofibrils (CNFs) produced with low extent of mechanical milling. The results showed that post-fibrillation endoglucanase treatment can effectively reduce the fibril degree of polymerization (DP) values and therefore entanglement. Cellulose DP was reduced from 520 for CNFs prepared by milling using a SuperMassColloider with 1 pass to 225 after endoglucanase treatment at a low dosage of 1 mg protein/g fibril for 24 h. Endoglucanase treatment can also effectively reduce the fibril mean diameter from 66 nm to 25 nm. Applying post-fibrillation endoglucanase treatment produced more uniform CNFs than the feed CNFs from pure mechanical treatment. All CNFs suspensions prepared by post-fibrillation endoglucanase treatment were non-Newtonian (except at very low concentrations below 0.5 wt%) with shear thinning behavior. Post-fibrillation endoglucanase treatment reduced the viscosity of CNF suspensions due to decreasing fibril DP values and the extent of entanglement.
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高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Shaohuang Chen,Ning Yue,Mei Cui,Anastasia Penkova,Renliang Huang,Wei Qi,Zhimin He,Rongxin Su
TEMPO-oxidized cellulose nanofibrils (CNFs) possess lots of attractive properties. However, recycling of TEMPO is desirable because of ecological and economic demands. In this study, a novel strategy integrating direct reuse and extraction recovery of TEMPO was developed. 50 % of filtrates after TEMPO oxidation were directly reused and half of the fresh TEMPO was added to maintain a constant dosage, the obtained CNFs within 2 cycles shared similar carboxylate contents, crystallinity , and homogeneous width compared to the original ones. Furthermore, TEMPO in another 50 % of filtrates was extracted by ethyl acetate followed by distillation. The CNFs produced using the extracted TEMPO had almost the same properties compared to those of original ones, suggesting a negligible loss of activity of the recovered catalyst. Compared to the traditional route, the combined strategy exhibited a 31.3 % reduction in production costs, which enables clean and cost-effective production of CNFs and shows a promising industrial feasibility.
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MOLECULES
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2022
·Vol. 27
·期 13
·4243
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IF 4.927
Weisong Zhao,Hong Chi,Shiyun Zhang,Xue Zhang,Tianduo Li
Ti3C2TxMXene has attracted considerable interest as a new emerging two-dimensional material for environmental remediation due to its high adsorption capacity. However, its use is greatly limited by its poor mechanical properties, low processability and recyclability, and the low dispersity of such powder materials. In this work, a porous adsorbent (C–CMP) containing cellulose nanocrystals (CNC), Ti3C2TxMXene and polyvinyl alcohol (PVA) was prepared by a simple and environmentally-friendly foaming method. Glutaraldehyde was used as crosslinker to improve the mechanical properties and boost the adsorption efficiency of methylene blue (MB) molecules. Fourier transform infrared (FT–IR), elemental analysis (EDX) and thermogravimetric analysis (TGA) further confirmed that the preparation of the C–CMP foam and cross-linking reaction were successful. Scanning electron microscope (SEM) indicated that the macropores were distributed homogeneously. The adsorption experiment showed that maximum adsorption capacity of MB can reach 239.92 mg·g−1which was much higher than anionic dye (methyl orange, 45.25 mg·g−1). The adsorption behavior fitted well with the Langmuir isotherm and pseudo-second-order kinetic models. Thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic. Based on FT–IR, EDX and X-ray photoelectron spectroscopy (XPS) analysis, the adsorption mechanism between C–CMP and MB molecules was attributed to electrostatic interaction.Keywords:foam;Ti3C2TxMXene;polyvinyl alcohol;cellulose nanocrystals;methylene blue;adsorption
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Qinyu Wang,Wei Zuo,Yu Tian,Lingchao Kong,Guiyuan Cai,Haoran Zhang,Lipin Li,Jun Zhang
To achieve efficient removal of copper(II) from heavy metal wastewater, designing an eco-friendly and low-cost adsorbent is highly desirable. Here, a novel air- and underwater shape-memory cellulose aerogel was reported via coupling brushite and polyethyleneimine (PEI)-modified nanofibrillated cellulose (NFC) for selectively adsorbing Cu(II) ions. The adsorption kinetic and isotherm studies were consistent with pseudo-second-order model and Langmuir model, indicating the removal of Cu(II) was a monolayer chemisorption process. Benefiting from the open three-dimensional (3D) framework structure and abundant exposed active sites, such compressible aerogel exhibited excellent adsorption capacity of 332.66 mg/g for Cu(II). In addition, the developed aerogel could be conveniently used as a continuous flow filter for successive purification of industrial wastewater, where the up-to-standard treatment volume was about 5.6 L. The Cu(II)-loaded aerogel could be regenerated after being eluted by 0.1 M EDTA-2Na, and its structure, shapeability and selective adsorption properties were hardly affected even after 8 consecutive cycles. Mechanistic analysis confirmed that the surface complexation, ion exchange and chemical deposition were the main driving forces for the superior adsorption performance. Finally, PNFCA/BRU could inhibit the contamination of crops by heavy metals, which was a great safeguard for wheat growth.
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CARBOHYDRATE POLYMERS
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2022
·
IF 10.723
Qianqian Peng,Yunjie Lu,Zhaohui Li,Jianming Zhang,Lu Zong
High-performance thermally insulating nanocellulose-based aerogels with robust mechanical properties is highly desirable for energy-saving and thermal protection applications. However, the large-scale applications of traditional nanocellulose aerogels are still limited by their brittleness nature and rigorous processes. Herein, an effective biomimetic hybrid strategy for high strength and thermal insulated nanocellulose-based aerogel with hierarchical-ordered microstructure is designed and fabricated. The novel cellulose nanoclaws-based aerogels extracted from corncob are hybridized by nanosized silica aerogel layer in situ and have an intensified H-bonding crosslinked network after ambient-drying and hotpress treatment, endowing excellent mechanical properties (16–58 MPa) as well as scalable potential for structure materials. Benefitting from the synergistic effect of the tailored hierarchical-ordered microstructure, the resulting hybrid aerogels also possess high specific surface area (30–630 m 2 g −1 ), low thermal conductivity (0.021 W m −1 K −1 ), and outstanding flame retardant . This hybrid strategy provides an avenue to produce thermal-insulated and mechanically robust materials.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 15
·8177-8194
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IF 6.123
Gao Meng-hang,Xie Xu,Huang Ting,Zhang Nan,Wang Yong
Developing the green dielectric materials satisfies the requirement of the sustainable development of society and economics. In this work, glutaraldehyde (GA)-assisted crosslinking strategy was developed to prepare the crosslinked regenerated cellulose (CRC) films, and the effects of different crosslinking methods, including crosslinking steps, concentration of GA solution and crosslinking time, on dielectric and mechanical properties of the CRC films were systematically investigated. Microstructure and morphology characterizations show that compared with the common RC films, the CRC films show apparently reduced defects and enhanced intermolecular interaction. At GA concentration of 6 vol% and crosslinking time of 30 min, the CRC film shows the lowest dielectric loss (0.03 at 1000 Hz, 92.3% smaller than RC film) and the highest breakdown strength (336.55 MV m −1 , 364.3% higher than RC film), and simultaneously, the film shows the high tensile strength of 76.8 MPa and excellent tensile modulus of 6.08 GPa, about 240.9% and 104% higher than those of the RC film, respectively. This work provides new insight in tailoring the dielectric and mechanical properties of the cellulose films through constructing the crosslinking structure, which is of great significance for the fabrication of the high-performance cellulose-based dielectric materials. Graphical abstract
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FOOD HYDROCOLLOIDS
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2022
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IF 11.504
Fu-Zhen Zhou,Xin-Hao Yu,Dong-Hui Luo,Xiao-Quan Yang,Shou-Wei Yin
Water-in-oil (W/O) emulsions have gained interest in many fields, including food, healthcare, pharmaceutical, and agriculture . However, research on Pickering W/O emulsions is limited due to the lack of available stabilizers. This study aimed to demonstrate the development of edible Pickering W/O emulsions using biocompatible and biodegradable gliadin/ethyl cellulose complex particles (GECPs) with neutral hydrophobicity as the stabilizer. The characterizations of GECPs indicated that the particle size, contact angle, and dynamic interfacial tension could be adjusted by varying the gliadin-to-ethyl cellulose (EC) ratio. The investigations of emulsions revealed that the most stable emulsions were obtained when the gliadin-to-EC ratio was 2:1. Moreover, stable emulsions could be prepared at particle concentrations higher than 1.5%. The phase inversion of emulsions from W/O to O/W occurred at 55 wt% water. Confocal laser scanning microscopy and the theoretical calculations confirmed that GECPs formed multiple interfacial layers and acted as physical barriers against coalescence, thereby contributing to the stability of emulsions for at least 433 days; no reverse inversion occurred after 2.3 years of storage. This study provided a new approach to prepare stable Pickering W/O emulsions from GECPs. This strategy might open interesting avenues in solving the dilemma where Pickering stabilization using edible particles is required.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2022
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IF 6.437
Gang Wu,Haojie Yang,Wenran Gao,Kui Wang,Maxim V. Penzik,Alexander N. Kozlov,Bin Li,Yong Huang,Shu Zhang,Hong Zhang
Acid-catalyzed hydrolysis and metal-catalyzed hydrogenolysis are two important methods for conversion of cellulose into high value-added chemicals, which preferentially use homogeneous acids and precious metals as catalysts, respectively. This paper reports that cobalt disulfide (CoS 2 ) can be competent in both acid hydrolysis and hydrogenolysis reactions as an inexpensive heterogeneous catalyst by controlling its morphology. Two kinds of CoS 2 with imperfect spherical (A-CoS 2 ) and regular octahedral (Syn-CoS 2 ) morphologies were tested in the conversion of 5-hydroxymethylfurfural (HMF) under a hydrogen atmosphere. Interestingly, A-CoS 2 showed high activity in the hydrogenolysis of HMF to 2,5-hexanedione (2,5-HD) with a yield of 81.5 wt%, while Syn-CoS 2 was responsible for the acid hydrolysis of HMF to methyl levulinate (ML) in high yield of 90.8 wt%. Characterization of the two catalysts suggested that Syn-CoS 2 had higher Co 2+ /Co 3+ ratio in comparison to A-CoS 2 , leading to a proportional difference in their acid site numbers. The unique activity of these two catalysts was also reflected in the conversion of cellulose. In particular, Syn-CoS 2 exhibited high selectivity to ML formation from cellulose and good recyclability.
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CELLULOSE
·
2022
·Vol. 29
·期 15
·8133-8150
·
IF 6.123
Sun Liangyun,Han Juan,Tang Chaofan,Wu Jiacong,Fang Sihan,Li Yuanyuan,Mao Yanli,Wang Lei,Wang Yun
As an effective substitute for ionic liquids (ILs), deep eutectic solvents (DESs) are known as a new generation of green solvents. In addition, DESs are considered to be the best solvents to replace traditional organic solvents and ILs due to their advantages of economy, simple preparation and biodegradability, which can be used to further break through the technical bottleneck in the field of biomass pretreatment. This study synthesized a series of choline chloride-based (ChCl-based) DESs and used them to pretreat microcrystalline cellulose (MCC) without dissolution, in order to achieve the purpose of improving the saccharification effect. DES-9 (ChCl/hydroquinone), DES-12 (ChCl/acetamide) and DES-16 (ChCl/acetic acid) were better pretreatment solvents. The optimum conditions for the pretreatment of MCC by DES-9 and DES-12 were both at 110 °C for 4 h, and the optimum condition of DES-16 was at 90 °C for 4 h. Compared with untreated MCC (26.66%), the saccharification yield of pretreated MCC with DES-16 increased by 20.5%. Finally, the structure and morphology changes of MCC before and after pretreatment were investigated in detail through the degree of polymerization (DP), SEM and enzyme adsorption. The results showed that DESs pretreatment made the surface of MCC become rough, which enhanced the accessibility of cellulose and enzymes, improving the saccharification effect. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 25
·12138-12146
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IF 4.682
Liu Yupeng,Jian Junyu,Xie Yitong,Gao Shishuai,Zhang Daihui,Shi Hao,Xu Yuzhi,Lai Chenhuan,Wang Chunpeng,Chu Fuxiang
Magnetic hydrogels have been widely utilized in the fields of biomedical devices, flexible electronics, and soft robotics. Unfortunately, current strategies to synthesize magnetic hydrogels are difficult to achieve high mechanical properties. Herein, we have presented a biomimetic strategy to synthesize a strong, tough and elastic cellulose enhanced magnetic hydrogel (CEMH). The cellulose skeleton containing magnetic nanoparticles was first generated by self-assembly of cellulose chains as the enhancement filler, while elastic polyacrylamide formed by in situ polymerization functioned as the elastic matrix. The mechanical and physicochemical properties of CEMH, as well as the effect of Fe 3 O 4 and acrylamide concentration on the performance, were systematically investigated. The highest tensile strength and toughness of CEMH could reach 1.1 MPa and 2.9 MJ/m 3 , respectively. Furthermore, CEMH showed a high elastic recovery of 94.5% (10th cycle), accompanies by a certain swelling resistance ability. All these advantages were accomplished mainly owing to the synergetic contribution of biomimetic design and enhanced non-covalent interactions.
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