JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2020
·Vol. 29
·期 3
·745-754
·
IF 2.572
Hu Yinghan,Guo Qing,Liu Peiwen,Zhu Ruonan,Lu Fachuang,Ramaswamy Shri,Wu Yuying,Xu Feng,Zhang Xueming
Aimed at decreasing the environmental pollution caused by petroleum-derived packing materials, many efforts have been directed towards fabricating biodegradable substitutes, especially of cellulose-based film with functional properties. In this paper, a totally plant-derived antibacterial film was successfully prepared. Regenerated cellulose films were used as substrate and poacic acid, a decarboxylated product from 8–5-diferulic acid, as fungicides. The physical properties and thermal stability of the prepared plant-derived antibacterial films were characterized, and the antibacterial activity was also assessed as the function poacic acid contents. The morphology showed that the cellulose/poacic acid films exhibited a homogeneous and smooth surface and poacic acid was successfully incorporated into cellulose films as revealed by Fourier-transform infrared (FT-IR) spectroscopy and fluorescent microscopy. It was noted that both the tensile strength and thermal stability of the antibacterial films decreased due to the incorporation of the poacic acid. Remarkably, the prepared cellulose/poacic acid films exhibited superior antibacterial activity against Staphylococcus aureus . The notable properties of the cellulose/poacic acid films are promising for applications in food and medical packaging to enhance their safety.
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高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Zhu Yue,Chen Tingting,Cui Zhenggang,Dai Hong,Cai Li
Stimuli-responsive surface-active microcrystalline cellulose (MCC) particles are obtained by interaction with conventional cationic surfactants such as cetyltrimethylammonium bromide (CTAB) in aqueous media, where MCC are in situ hydrophobized by adsorption of the cationic surfactant in water via electrostatic interaction and with the in situ hydrophobization removed by adding an equimolar amount of an anionic surfactant such as sodium dodecyl sulfate (SDS). The trigger is that the electrostatic interaction between the oppositely charged ionic surfactants is stronger than that between the cationic surfactant and the negative charges on particle surfaces, or the anionic surfactant prefers to form ion pairs with the cationic surfactants and thus making them desorbed from surface of MCC. Reversible O/W Pickering emulsions can then be obtained by using the MCC in combination with trace amount of a cationic surfactant and an anionic surfactant, and the anionic surfactant with a longer alkyl chain is more efficient for demulsification. With excellent biocompatibility, biodegradability, and renewability, as well as low toxicity, the biomass cellulose particles that can be made stimuli-responsive and able to reversibly self-assemble at fluid interface become ideal biocompatible particulate materials with extensive applications involving emulsions and foams.
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ACS Catalysis
·
2020
·
IF 12.35
Haiyong Wang,Haosheng Xin,Chiliu Cai,Changhui Zhu,Zhongxun Xiu,Qiying Liu,Yujing Weng,Chenguang Wang,Xinghua Zhang,Shijun Liu,Zifang Peng,Longlong Ma
Keto-alcohols, which are traditionally produced from fossil resources with multisteps, are considered as important intermediates for diversified high-value-added fine chemical synthesis due to their involved carbonyl and hydroxyl groups. Herein, direct cellulose hydrogenolysis to C3-C4 keto-alcohol products (hydroxyacetone and 1(3)-hydroxy-2-butanone) was achieved over Ni-WOx/C catalysts with an W/Ni atom ratio of 1.0–5.0. The keto-alcohol yield was proposed to strongly depend on the W/Ni ratio and the catalyst annealing temperature. The highest keto-alcohol yield of 63% was obtained at the optimal balance of basic/acidic WOx species and metallic Ni. The introduction of Ni facilitated the formation of the basic W5+ sites, which enhanced the formation of basic sites at the Ni-WOx interface. The synergistic effect between the basic W5+ and acidic oxygen vacancy (Vö) could activate the target C–O/C═O bonds, promoting the isomerization of glucose and C3-C4 aldehyde intermediates with the assistance of the interfacial Ni. The cooperative adsorption of the −OH and −C═O groups at the Ni-O-W-Vö interface stabilized the adjacent ketone and hydroxyl groups and kept the other hydroxyl groups for hydrogenolysis, obtaining the final C3-C4 keto-alcohols. This work expanded the application of cellulosic biomass, enabling the green and sustainable synthesis of the high-value C3-C4 keto-alcohol products using lignocellulosic biomass as a raw material.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Yue Jiang,Gaobo Yu,Yang Zhou,Yuanyuan Liu,Yuhong Feng,Jiacheng Li
In this work, we reported the in situ biological modification of bacterial cellulose (BC) using various sodium alginate with different molecular weights as the carbon source in the fermentation media. The presence of sodium alginate (SA) showed a great influence on the microstructure of the resulting components of bacterial cellulose incorporated with sodium alginate (SA-BCs), based on the characterization results of SEM images, FT-IR analysis, crystallinity index, and contact angles. With the addition of high molecular weight of SA, the resulting high molecular weight of SA and BC composite (H-SA-BC) demonstrated a narrower fiber and less intramolecular hydrogen bonds, as compared to the modified BCs with lower molecular weights. Specifically, the crystallinity index value of SA-BCs was observed to decrease with the increase of SA’s molecular weight. Using these SA-BCs as emulsifiers, the corresponding physicochemical properties and emulsifying performances of BC and SA-BCs in the stabilization of olive oil Pickering emulsion were fully assessed by Optical micrographs, the diameter of droplets and CLSM images. SA-BCs were proven to show stronger amphipathicity as compared to BC due to the lower molecular regularity of SA-BC and the presence of carboxyl groups. The droplets of the emulsions are observed to be smaller and more uniform when stabilized by the emulsifier of H-SA-BC. Therefore, the addition of SA in the biological modification of BC resulted in a great change in both morphology and amphiphilicity. These results would be helpful in the understanding of the development of natural materials as stabilizers for the potential applications of Pickering emulsions.
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CATALYSIS LETTERS
·
2020
·Vol. 151
·期 7
·1984-1992
·
IF 2.482
Wu Ningxin,Zhang Manling,Pan Xiaomei,Zhang Jin,Gao Lijing,Xiao Guomin
Abstract The production of 5-hydroxymethylfurfural (HMF) from cellulose is of great significance for the high-value utilization of biomass, although this route currently faces the challenge of low efficiency. In the present work, a series of effective (x)Hf/ZSM-5 catalysts were developed for HMF production from cellulose, and analyzed by BET, XRD, SEM, ICP, NH 3 -TPD, Py-FTIR techniques. Driven by the (5)Hf/ZSM-5 catalyst, HMF with a yield of up to 67.5% and 17.2% of furfural are simultaneously obtained from cellulose in the H 2 O (NaCl) /THF biphasic system. Moreover, after four consecutive cycles, (5)Hf/ZSM-5 catalyst still maintained part of its catalytic activity. The 67.5% HMF yield achieved herein is one of the highest yields achieved in the conversion reaction using cellulose as a substrate, and the catalytic performance of the H 2 O (NaCl) /THF system containing the (5)Hf/ZSM-5 catalyst is even comparable to that of the expensive ionic liquid system. This result reflects the application prospect of (5)Hf/ZSM-5 catalyst in the future industrial production process of HMF. Graphic Abstract
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yingying He,Shuai Li,Li Zhou,Chun Wei,Chuanbai Yu,Yunhua Chen,Hongxia Liu
The development of multifunctional microwave absorbers that worked in complex environments remains challenging. In this study, oil-in-water Pickering emulsion gelation approach was combined with freeze-drying to prepare foam-based microwave absorbers along with appealing photo-thermal conversion and thermal insulation. In hybrid foam, cellulose nanofibrils (CNF) and polylactic acid (PLA) serve as three-dimensional skeleton, where carbon nanotubes (CNT) and Fe 3 O 4 nanoparticles are homogeneously incorporated, which forms a conductive network with hetero-interfaces. The optimal reflection loss value of the foam reaches −65.14 dB with a thickness of 3.0 mm. The foam also demonstrate high photo-thermal conversion performance with its surface temperature up to 97 °C after irradiation under 1 Sun for 5 min. Additionally, the foam shows superior thermal insulation comparing with the commercial polyvinyl alcohol and polyurethane foams. This study may offer a promising approach to develop ultralight and high-performance microwave absorber with great potential for multifunctional applications.
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PubMed
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1527-1540
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IF 5.044
Tang Zuwu,Miao Yanan,Zhao Jing,Xiao He,Zhang Min,Liu Kai,Zhang Xingye,Huang Liulian,Chen Lihui,Wu Hui
Hydrogels are attractive due to their various applications in the fields of biomedical materials, cosmetics, and biosensors. To enhance UV protection and prevent skin penetration behaviors, inspired by the mussel adhesive proteins, the functional polydopamine (PDA) is employed herein to fabricate polydopamine/carboxymethyl cellulose/polyacrylic acid (PDA/CMC/PAA) adhesive hydrogels. To disperse PDA nanoparticles well in the PAA matrix, dopamine was self-polymerized in CMC solution to form PDA/CMC complex. Acrylic acid was polymerized in PDA/CMC complex solution and cross-linked to construct UV-resistant PDA/CMC/PAA hydrogel. The morphology, rheological behavior, mechanical properties and adhesion strength of PDA/CMC/PAA hydrogels were studied by scanning electron microscopy, rotational rheometer, universal test machine. Owing to the hydrogen bonding interaction between the PDA/CMC complex and PAA, the PDA/CMC/PAA hydrogels showed high resilience and compressive strength to withstand large deformation. The hydrogels exhibited strong adhesion to various substrate surfaces, such as stainless steel, aluminum, glass and porcine skin. The biocompatibility and UV-shielding properties were investigated through culture of cells and UV irradiation test. The adhesiveness of PDA promoted cell adhesion and provided the PDA/CMC/PAA hydrogels good biocompatibility with 96% of relative cell viability. The hydrogels possessed excellent UV-shielding ability to prevent collagen fibers from being destroyed during UV irradiation, which has promising potential in the practical applications for UV filtration membrane and skin care products.
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CORROSION SCIENCE
·
2020
·
IF 6.479
Jixing Wang,Junlei Tang,Hailong Zhang,Yingying Wang,Hu Wang,Bing Lin,Jian Hou,Haibing Zhang
A CO 2 -responsive coating has been developed by adding a thiourea-containing nanocontainer with pH-response release property into an ethyl cellulose coating. The cumulative release of thiourea in the nanocontainer changes with the pH of aqueous solution, which enabled the release rate of thiourea from the nanocontainer in coating to adapt to the change in corrosiveness of 3.5 wt. % NaCl with different dissolved CO 2 content. The results of EIS and immersion experiments showed that this environmental responsive nanocontainer can significantly improve the corrosion resistance of the coating in 3.5 wt. % NaCl solution with and without CO 2 .
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Muhammad Ibrar,Houjin Zhang
Site-specific, covalent immobilization of protein is of great importance in the design of bioanalytical devices. User-defined covalent coupling of protein onto the surface has been primarily limited to a noncanonical amino acid or cysteine residues. It is desirable to develop a new approach for site-specific biofunctionalization. Herein, we demonstrate a robust and modular chemoenzymatic approach for site-specific, covalent grafting of proteins onto a surface. The synthetic strategy relies on the combination of surface amine functionalization, followed by sortase-mediated coupling. The developed method was validated by site-specific immobilization of two model proteins (glutathione S-transferase and green fluorescent protein) on cellulose and polydimethylsiloxane surfaces via a short recognition motif (LPETG). The covalent coupling of immobilized proteins at the interface was characterized by Fourier Transform Infrared Spectroscopy in attenuated total reflectance mode, X-ray photoelectron spectroscopy, atomic force microscope, and fluorescent microscopy. This enzymatic surface functionalization approach could permit an oriented, homogeneous, and site-specific covalent tethering of LPETG-tag proteins to other materials under mild conditions.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 16
·50224
·
IF 2.52
Kiran Shahzadi,Xuesong Ge,Yaning Sun,Shaojuan Chen,Yijun Jiang
Bio-based materials with multifunctional performance are getting immense attention nowadays for their environment friendly and renewable character. Inspired by toughening effect of graphene nanosheets and borate chemistry, a simple in-situ borate crosslinking in water and freeze-drying method was employed to fabricate a fire retarded bio-based aerogel. The structure of the material was evaluated and analysis by SEM, XRD, FTIR, Raman and XPS. Importantly, the bio-based aerogel has improved strength and adsorption properties due to unique structure. The compressive strength of rGO(reduced graphene oxide) + CMC (carboxymethyl cellulose) aerogel could reach 128 ± 2.1 kPa which is five times that of neat CMC aerogel. The bio-based aerogel can load more than 2500 times of self-weight. The adsorption capacity for organic solvents and oil of rGO+CMC aerogel is also greatly improved by a little rGO (1%) introducing due to its unique porous structure and hydrophobic nature of rGO. Additionally, rGO+CMC aerogel is also found fire resistant with relatively low thermal conductivity due to the borate and GO introduction.
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高影响因子
Advances in Materials Science and Engineering
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2020
·
IF 1.271
Airong Xu,Yongxin Wang,Xingmin Xu,Zhihong Xiao,Rukuan Liu
With the widespread use and increasing consumption of PET, the amount of waste PET is growing rapidly, and the accompanied environmental problems will become more and more serious. Therefore, the recycling and reuse of PET are of great significance for not only saving resources but also solving environmental issues. In this study, Methylcellulose (MC) composites reinforced with waste plastics polyethylene terephthalate (PET) were prepared by casting an MC/PET solution with a varying mass ratio of MC to PET. Systematic investigations were performed to reveal the effect of the MC/PET mass ratio on the mechanical property, chemical structure, and thermal properties. The resultant findings indicate that the addition of 3% waste plastics PET to MC could notably enhance the tensile strength by about 24% as compared with neat MC. Interestingly, the elongation of the MC/PET composite kept increasing with increasing waste plastics PET. At the same time, thermal compression treatment could also enhance the mechanical properties of the composite. Moreover, the composites also displayed higher thermal stability than MC. In addition, the crystallinity and morphology of the composite were estimated by XRD and SEM.
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MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Daman Xu,Genhui Teng,Yingqi Heng,Zhizhong Chen,Dongying Hu
The transparent and renewable porous cellulose separators (ACR-3, ACR-5, ACR-7, ACR-9) with different concentration of cellulose solution (3 wt%, 5 wt%, 7 wt%, 9 wt%) were prepared via a phase-inversion process with 1-allyl-3-methylimidazolium chloride (AMIM-Cl) as the solvent. Cellulose separators displayed high thermal stability, strong mechanical properties and excellent apparent properties. ACR-7 separator showed a higher porosity of 74.90% and electrolyte uptake of 323.68% with a smaller pore size and a more uniform pore structure compared with the other cellulose separators. The assembled supercapacitors (electrode/separator/electrode, SCD-7) showed good electrochemical performances in many aspects, including a lower equivalent series resistance of 0.5Ω, a higher charge-discharge efficiency of 98.58% at 3 A/g and areal capacitance of 1.15 F cm −2 at 5 mV/s than the SCD-3, SCD-5, SCD-9 and the assembled SCDs with two commercial separators (TF4040 for SCD-40 and MPF30AC for SCD-30). SCD-7 showed a high retention of 81.99% after 4000 charge-discharge tests at 1 A/g, showing a good charge-discharge cycle stability. Compared with SCD-40 and SCD-30, SCD-7 showed a lower voltage drop below 0.03 V, a higher specific capacitance of 130 F/g, energy density of 25.94 Wh/kg and power density of 0.36 kW/kg at 0.5 A/g. Overall, ACR-7 is expected to be applied as a separator in the field of supercapacitors.
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