INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Haibin Yuan,Wei Li,Chen Chen,Haiyan Yu,Juan Huang,Huaixiang Tian
Bacterial cellulose, a naturally porous nanomaterial, shows significant potential in encapsulation and sustained-release applications. However, effective methods to construct bacterial cellulose microcapsules (BCM) are lacking, resulting in low embedding rates and poor slow-release effects. This study presents a novel and efficient BCM preparation strategy using mercerization to embed cinnamon essential oil (CEO). The CEO-BCM system was evaluated for its efficacy in preserving prefabricated meat. Results demonstrated that BCM, embedded with CEO through mercerization, achieved an embedding rate of 94.9 % and an average particle size of 63.7 μm. Mercerization transformed BC crystalline into cellulose type II, densifying the BCM structure, while intermolecular hydrogen bonding between BCM and CEO enhanced the stability of CEO-BCM. Release kinetics analysis indicated that CEO release was primarily diffusion-driven (Peppas-Sahlin model) with sustained release performance up to 20 days. Additionally, CEO-BCM exhibited excellent long-term antibacterial (≥81.2 % within 20 days), antioxidant, and thermal stability, effectively extending the shelf life of prefabricated meat products from 5 to 10 days. The developed BCM construction strategy not only addresses the challenges of direct BCM preparation and the limitations in core embedding and controlled release, but also enhances the stability of the CEO. This advancement further expands the application areas of bacterial cellulose (BC), and the prepared CEO-BCM system holds significant potential for food preservation applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Wenhui Tian,Penggang Ren,Xin Hou,Runzhuo Xue,Zhengyan Chen,Zhengzheng Guo,Yanlin Jin,Fang Ren
Preparing electrode material integrated with high gravimetric/volumetric capacitance and fast electron/ion transfer is crucial for the practical application. Owing to the structural contradiction, it is a big challenge to construct electrode material with high packing density, sufficient ion transport channels, and fast electronic transfer pathways. Herein, MnO 2 porous carbon composite with abundant porous structure and 3D carbon skeleton was facilely fabricated from Linum usitatissimum . L stems via NaOH activation and MnO 2 introduction. The in-situ introduced MnO 2 not only increases the packing density and the electrical conductivity of the porous carbon but also provides more active sites for oxidation reactions . These unique characteristics endow the resultant MnO 2 porous carbon composite with remarkable gravimetric capacitance of 549 F g −1 , volumetric capacitance of 378 F cm −3 , and capacitance retention of 54.9 %. Giving the simple process and low cost, this work might offer a new approach for structural design and the practical application of high-performance electrode materials.
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FUEL
·
2024
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IF 6.7
Jian Li,Wen Fu,Xiaowei Bai,Xiangrui Lin,Heping Yang,Mengfei Wang,Guangxuan Liu,Zhenghua Dai
Oxidative pyrolysis of biomass, which introduces controlled oxygen into the reaction, enables autothermal processes and addresses heat transfer challenges in large reactors. Oxygen promotes exothermic reactions and changes product composition. Given the unique chemistry of cellulose, hemicellulose, and lignin, their pyrolytic behaviors vary with oxygen levels. This study examines these variations. The results indicate that when 10 vol% of oxygen is introduced, for cellulose, the main impact is on the third (310–410 °C) and fourth (410–700 °C) stages of pyrolysis, where O 2 reacts with the produced sugars (reducing by 6.6 %) and biochar to generate CO, a small amount of CO 2 , and water; for hemicellulose, the main impact is on the fourth stage (340–850 °C), where O 2 reacts with the produced biochar to generate CO, a small amount of CO 2 , and water; for lignin, the main impact is on the second (190–410 °C) and third (410–850 °C) stages, where O 2 reacts with the produced phenolic monomers (reducing by 2.2 %) and biochar to generate CO 2 , a small amount of CO, and water. Cellulose and hemicellulose generate more CO in oxidative pyrolysis, whereas lignin produces more CO 2 , due to varying oxygen content. Furthermore, after the introduction of 10 vol% of oxygen, the pyrolysis process of both lignin and cellulose is advanced, with lignin reaching an exothermic peak value of 18.6 mW/mg, which is 5.3 mW/mg higher than that of cellulose and 11.2 mW/mg higher than that of hemicellulose, indicating that lignin releases the most heat, while hemicellulose releases the least.
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CARBOHYDRATE POLYMERS
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2018
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IF 5.158
Chuanwei Lu,Juan Yu,Chunpeng Wang,Jifu Wang,Fuxiang Chu
Cellulose-rosin based thermoplastic elastomers with UV absorption properties were fabricated by a combination of rosin, poly(butyl acrylate) (PBA) and ethyl cellulose (EC) via “graft from” ATRP with the aid of EC-rosin macroinitiator (EC- g -(DA)-Br) prepared by a simple esterification reaction between EC, dehydroabietic acid (DA, one of rosin’s resin acids) and 2-bromoisobutylryl bromide. The introduction of rosin affords these elastomers with UV absorption property. And the glass transition temperature of these EC-rosin grafted copolymers could be tuned by changing the content of PBA. Moreover, the introduction of PBA to EC endowed EC- g -(DA)- g -PBA with a good film-forming property and excellent thermoplastic elastomer behavior. All of these EC-rosin grafted copolymers showed an excellent UV absorption performance, and maintained outstanding UV absorption capability after continuous UV-irradiation or being heated to 115 °C for 1 h. As a result, these EC-rosin grafted copolymers have a potential application in coating materials with UV absorption property.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2018
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IF 3.412
Siyuan Liu,Xiaoxi Li,Ling Chen,Lin Li,Bing Li,Jie Zhu
In order to control d-limonene permeability, cellulose nanocrystals (CNC) were used to regulate starch-based film multiscale structures. The effect of sphere-like cellulose nanocrystal (CS) and rod-like cellulose nanocrystal (CR) on starch molecular interaction, short-range molecular conformation, crystalline structure, and micro-ordered aggregated region structure were systematically discussed. CNC aspect ratio and content were proved to be independent variables to control d-limonene permeability via film-structure regulation. New hydrogen bonding formation and increased hydroxypropyl starch (HPS) relative crystallinity could be the reason for the lower d-limonene permeability compared with tortuous path model approximation. More hydrogen bonding formation, higher HPS relative crystallinity and larger size of micro-ordered aggregated region in CS0.5 and CR2 could explain the lower d-limonene permeability than CS2 and CR0.5, respectively. This study provided new insight for the control of the flavor release from starch-based films, which favored its application in biodegradable food packaging and flavor encapsulation.
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ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Minjie Hou,Miaojun Xu,Bin Li
A novel conductive paper based on cellulose nanofiber (CNF) and reduced graphene oxide (RGO) with a sandwich structure was successfully prepared through step-by-step vacuum filtration followed by a chemical reduction process in which a CNF layer is sandwiched between two thin RGO layers. This unique design strategy not only provides a highly conductive network for its surface but also maintains the structural integrity of CNF. The sandwich-structured paper exhibits a significantly conductive anisotropy, and the in-plane electrical conductivity is drastically enhanced as 4382 S m–1 with only 4 wt % RGO, whereas it is insulating along the cross-plane direction. This can be attributed to the RGO layers at the top and bottom surface connected in parallel. This high electrical conductivity is greatly superior to most of the cellulose/graphene composite papers obtained by conventional blending processes. Compared with the similar layer-by-layer assembly technique, the present method is more feasible and time saving. Moreover, the sandwich-structured paper shows excellent mechanical strength and good flexibility, which may facilitate its applications in future flexible electronics.
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MATERIALS SCIENCE FORUM
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2018
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IF 0
Miao Ying Jin,Shi Yan Chen,Bao Xiu Wang,Hua Ping Wang
Wound healing is accompanied by keloids, it is important to develop a wound dressing which can inhibit keloid and relieve pain and pruritus in patients. In this paper, bacterial cellulose/triamcinolone acetonide (BC/TA) composites are prepared by easy solution impregnation method, which the structures of BC/TA composites were analyzed by fourier transform infrared spectroscopy (FTIR). The drug release and inhibition of L929 cells were also analyzed. It can be concluded that BC/TA composites have a sustained release effect on TA and can effectively inhibit proliferation of L929 in the range of 0.5-2.0 mg/cm2.
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FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 2
·340-349
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IF 1.353
Wang Yixi,Wang Hao,Peng Huili,Wang Zhicun,Wu Jianning,Liu Zhiyong
A novel eco-friendly porous adsorbent of cellulose (CE)/chitosan (CS) aerogel was prepared through sol-gel process and freeze-drying to remove Congo Red (CR). A series of aerogels were prepared by adjusting the mass ratios of CE and CS. Composite aerogels were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and X-ray diffraction (XRD). SEM images showed that it was possible to change the structure of the aerogel by adjusting the amount of chitosan. The effects of dosage of chitosan, initial pH, temperature, adsorbent dosage, contact time, and initial dye concentration on adsorption capacities for CR were studied in detail. Batch adsorption studies showed that aerogel exhibited maximum removal efficiency to CR at a composite ratio of 1:3 and dosage of 2.5 g/ l . CE/CS aerogel had excellent adsorption capacities for CR at a pH range of 3-11, which indicated stability of the aerogel in both acidic and alkaline conditions. CR adsorption on the composite aerogel fitted pseudo-second-order kinetics and Langmuir isotherm. The Langmuir isotherm model revealed that the maximum theoretical adsorption capacity of this material for CR was 381.7 mg/g at pH 7.0 at 303 K for 24 h. The adsorption mechanism included electrostatic and chemical interactions. The results indicated that the adsorption capacity of CE/CS aerogels was higher than the other chitosan composites adsorbents.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·Vol. 141
·期 32
·e55745
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IF 2.7
Xin Chen,Jianyan Feng,Shuaishuai Han,Yang Bai,Peng Wang,Haoqiang Liu,Peng Zhang,Xiaomin Luo
With the implementation of the “plastic restriction order” and the demand for sustainable society development, biodegradable coatings derived from biomass materials have garnered significant interest. This study presents the synthesis of a double-salt bio-based waterborne polyurethane (PLA-WPU) by utilizing poly(lactic acid) polyol (PLA) and isophorone diisocyanate (IPDI) as the main raw materials, along with 2,2-dihydroxymethylpropionic acid (DMPA) and sodium ethylenediamine ethanesulfonate (A-95) as a hydrophilic chain extender. Synergistic reinforcement of PLA-WPU using hydrophobically modified cellulose nanocrystals (M-CNC) and polycarbonate diimide (PDCDA). At an M-CNC content of 3% relative to the effective mass of PLA-WPU, the tensile strength reached 36.12 MPa. After 8 days a lipase PBS solution, the degradation rate reached 54%. Excellent waterproof performance was observed, exhibiting a contact angle of 143.5°. When applied as a surface coating on kraft paper, the Cobb 60 value decreased from 74.0 to 28.6 g/m 2 , while increasing the tensile strength by 451.3%. Importantly, the kraft paper maintained excellent waterproofing, mechanical strength, and high barrier properties even after repeated folding, high and low-temperature conditions, and exposure to varying pH solutions. It proved to be both degradable and recyclable, making it a promising alternative to liner paper or plastic membrane, especially in food packaging.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Junbo Chen,Yuanpeng Xie,Maosong Tian,Jingfu Tian,Zhihao Liang,Haibo Xie,Menglan Lv
Cellulose has drawn much attention in the field of interfacial solar steam generation (ISSG) due to its advantages of renewability, abundant availability, and hydrophilicity. However, the hydroxyl groups of cellulose form weak hydrogen bond interaction with water, resulting in high evaporation enthalpy and thereby low evaporation rate. Herein, carboxylic acid groups possess of strong interaction with water were introduced into cellulose hydrogel to fabricate efficient ISSG. The carboxylated cellulose hydrogels feature excellent hydrophilicity and water supply capacity because of its rich hydroxyl groups, carboxyl groups, and pore structure. More importantly, the carboxyl groups can effectively weaken the hydrogen bond interactions between water molecules, resulting in larger intermediate water contents that reduced water vaporization enthalpy as small as 1198 J g −1 . Consequently, the evaporator shows a remarkable evaporation rate of 3.68 kg m −2 h −1 under one sun irradiation when using bamboo carbon black as the photothermal material. Moreover, the evaporator exhibits superior seawater and sewage purification capabilities, along with outstanding salt resistance. This work presents an advisable strategy of cellulose structure design for interfacial solar evaporation.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Mingfeng Wu,Huan Wang,Afroza Akter Liza,Lukuan Guo,Wenyuan Zhu,Junlong Song,Fengshan Zhang,Yanshao Liu,Yongcan Jin,Jiaqi Guo
3D printing technology is one of the most promising strategies for constructing topological functional materials. The development of functional inks is a core issue in the technical development of 3D printing technology. In this study, we engineered photonic crystal inks based on chiral nematic liquid crystals of cellulose derivative, i.e. hydroxypropyl cellulose (HPC), and applied it to direct-ink-writing (DIW) 3D printing technology. We modified hydroxypropyl cellulose by etherification reaction to obtain photo-cross-linkable water-soluble hydroxypropyl cellulose acrylate (HPCA) with different degrees of substitution (DS). We comprehensively explored the effect of the DS on the initial concentration of formed chiral nematic liquid crystal and quantitatively, analyzed the relationship between the DS and the helical structure of the chiral nematic structure. We used photo cross-linkable chiral nematic HPCA as photonic crystal ink to construct structure-color 3D objects of diverse shapes. The constructed structure-color objects showcase robust tolerance against temperature and acidic conditions (pH = 1). Moreover, the color of the constructed objects is independent of the observation angle. The photonic crystal ink based on chiral nematic liquid crystals of biodegradable polysaccharide materials is expected to have excellent market prospects in the fields of such as smart packaging and optical devices.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zixuan Guo,Zhiwei Tian,Gaigai Duan,Qiliang Fu,Chunmei Zhang,Xiaoshuai Han,Haoqi Yang,Shuijian He,Shaohua Jiang
The complex structure of cellulose leads to its low accessibility to reagents, which hinders the further development of cellulose-based natural fibers in supercapacitors. The key issue is how to achieve deep internal activation while maintaining the flexible self-supporting skeleton structure of cellulose. In this work, an intercalation activation method was proposed. The activator infiltrated into the cellulose microcrystalline structure under rapid swelling to construct a new hydrogen bond network. RC/N2 has a large specific surface area (1897 m 2 g −1 ) and exhibits excellent electrochemical performance due to the uniform activation of NaOH pre-inserted between cellulose layers while ensuring the flexibility of cellulose. At a current density of 0.1 A g −1 , it reaches 352 F g −1 , and the assembled symmetric supercapacitor has a capacitance retention rate of 98 % after 70,000 cycles. In addition, the symmetric flexible supercapacitor assembled based on RC/N2 has good stability after multi-angle bending, which opens up further possibilities for the development of flexible energy storage devices.
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