FOOD HYDROCOLLOIDS
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2024
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IF 11
Cailing Tong,Chen Huang,Haoyu Lai,Kailin Li,Xinxin Zeng,Chengrong Wen,Chunhua Wu,Jie Pang
Konjac glucomannan/κ-carrageenan (KGM/KC) composite hydrogels often fail to meet industrial requirements due to their weak mechanical properties, while nanofillers are potential materials to address this challenge by taking advantage of their nano-size and filling effects. Herein, carboxylated cellulose nanocrystals (C–CNCs) were chosen as nanofillers to regulate the properties of KGM/KC composite hydrogels, with focus on the effect of C–CNCs concentration on the morphological and physicochemical properties. Meanwhile, an in-depth exploration of the possible mechanisms was also underlying. C–CNCs were well dispersed within the KGM/KC composite matrix, which positively enhanced the mechanical strength, as well as increased the apparent viscosity and modulus of the composite hydrogel greatly when the C–CNCs concentration was 10 % (w/w). This is mainly ascribed to the enhancement of hydrogen bond interaction among the KGM, KC, and C–CNCs, which were verified by Fourier transform infrared spectroscopy. Additionally, the results of low-field nuclear magnetic resonance confirmed the presence of C–CNCs in the hydrogel matrix reduced the water mobility of the hydrogel, which improved the freeze-thaw stability of the composite hydrogel. The fitting of the Power law model (R 2 > 0.98) showed that the swelling mechanism of KGM/KC composite hydrogels belonged to Fickian diffusion, and the swelling behavior could be regulated by adjusting the C–CNCs concentration. However, the excessive C–CNCs might weakened the interaction of composite hydrogels, which partially explains the reversal of the reinforcement effects seen at the lower additions of C–CNCs inclusion. These results provide a basis for the development and design of KGM/KC-based products with desirable attributes.
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POLYMER ENGINEERING AND SCIENCE
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2011
·Vol. 51
·期 12
·2417-2424
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IF 1.296
Yiming Zhou,Shiyu Fu,Hao Liu,Shaoping Yang,Huaiyu Zhan
Superadsorbent cellulose-graft-acrylic acid (C-g-AA) hydrogels were successfully prepared via free radical polymerization in phosphoric acid solution. Phosphoric acid solution provides a homogeneous reaction system. The C-g-AA hydrogels have a porous network inner structure with cellulose as the backbone. The introduced carboxyl groups enable the C-g-AA hydrogels with good swelling property (swelling ratio 7327%) and excellent MB adsorption capacity (equilibrium adsorption amount 2197 mg g −1 ). The dynamic swelling behaviors of the hydrogels were tested, water intake of hydrogels followed a non-Fickian type diffusion. The effects of mole ratio of AA to cellulose, the pH of adsorption medium and the initial MB concentration on dye adsorption capacity of hydrogels were investigated. The adsorption isotherm and kinetics fit the Langmuir model and the Pseudo-second-order model well, respectively. Desorption was carried out in weak acid solution and 70% MB could be removed, suggesting the C-g-AA hydrogels had the potential for reuse. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers
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RADIATION PHYSICS AND CHEMISTRY
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2011
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IF 1.132
Ning Zhang,Jianchun Jiang,Xiangyu Li,Yajuan Tong
The changes of cellulose microstructure after being implanted by low energy N + were studied by infrared (IR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The results showed that the cellulose intramolecular and the intermolecular hydrogen bonds have broken after being implanted by N + . With the increase in implantation doses, the cellulose relative degree of crystallinity reduced gradually, when the implantation doses increased to 1500×10 14 N + cm −2 , the relative degree of crystallinity decreased 6.84% than the control sample. Furthermore, the average diameter of cellulose powder reduced gradually as well, and many tiny fragments were visible on the surface of cellulose powder.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Yejun Zhong,Wenrong Huang,Yawen Zheng,Tingting Chen,Chengmei Liu
A novel carrier comprised of ethanol- and alkali-modified cellulosic pomelo pith matrix coated with alginate was developed to improve viability while enabling gastrointestinal release of probiotics. Scanning electron microscopy imaging revealed the agricultural byproduct had a honeycomb-structured cellulose framework, enabling high loading capacity of the probiotic Lactobacillus plantarum up to 9 log CFU/g. Ethanol treatment opened up pores with an average diameter of 97 μm, while alkali treatment increased swelling and porosity, with an average pore size of 51 μm. The survival rate through the stomach was increased from 89.76 % to 91.08 % and 91.24 % after ethanol and alkali modification, respectively. The control group displayed minimal release in the first 4 h followed by a burst release. Both ethanol modification and alkali modification resulted in constant linear release over time. The release time was prolonged when decreasing the width of the pomelo peel rolls from 10 mm to 5 mm while keeping the volume of the peel constant. After 8 weeks of refrigerated storage, the cellulose-encapsulated probiotics retained viability above 7 log CFU/g. This study demonstrates the potential of the structurally intact, sustainably-sourced cellulosic pomelo pith for probiotic encapsulation and controlled delivery.
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CARBOHYDRATE POLYMERS
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2010
·
IF 3.167
Xue Mao,Bin Ding,Moran Wang,Yanbing Yin
In this study, a novel nanocomposite multilayers was deposited on the electrospun nanofibrous mats by an electrostatic layer-by-layer (LBL) self-assembly technique. The positively charged water-insoluble 2,9,16,23-tetraaminophthalocyanine copper (CuTaPc) and the negatively charged water-soluble poly(acrylic acid) (PAA) were alternately deposited on the surface of negatively charged nanofibrous cellulose mats. The cationic CuTaPc was synthesized and characterized by UV–Vis and Fourier transform infrared (FT-IR) spectroscopy. The template nanofibrous cellulose mats were obtained from the alkaline hydrolysis of electrospun nanofibrous cellulose acetate mats. The resultant nanofibrous mats were characterized by scanning electron microscopy (SEM) and FT-IR spectroscopy. The SEM images showed that the composite LBL structured films were homogeneously deposited on the surface of the nanofibers . The diameters of nanofibers increased with the number of deposition bilayers . The average thickness of each CuTaPc/PAA bilayer is about 10 nm. Additionally, the FT-IR spectra results also indicated that the CuTaPc and PAA were coated on the nanofibrous cellulose mats.
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INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Jiazhi Han,Mingjie Chen,Huiming Liu,Dandan Zhang,Qing-shan Shi,Xiaobao Xie,Yanzhu Guo
The investigation of environmentally friendly and sustainable replacement materials is consistently prompted by the mounting environmental concern over plastics derived from petrochemicals. Compared with fossil oil derived chemicals and materials, cellulose is more readily available, less expensive, and biodegradable. Herein, all-cellulose composite films with excellent biodegradability and antimicrobial activities were prepared for sustainable food package. The all-cellulose films were prepared by a simple solution cast method of amino cellulose and carboxymethyl cellulose mixture. Rheological studies suggest typical non-Newtonian and shear thinning behavior of the all-cellulose solution associated with strong intermolecular electrostatic interactions. Such composite results in package films with amorphous structure, and uniform, dense and smooth morphology. Properties explorations indicated that the all-cellulose composites films exhibited better mechanical properties, water vapor and oxygen barrier properties than conventional synthetic plastic packages. Besides, the all-cellulose films showed excellent antimicrobial activity, and biodegradability. When applied as shrimp package, the all-cellulose composite films effectively extended shelf-life of shrimp by inhibition of microbial and oxidative deterioration of shrimp meat. This study provides a feasible approach to syntheze biodegradable and antimicrobial functional food package from cellulose in replacing of traditional synthetic plastic films.
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Research
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2024
·
IF 8.5
Qian Long,Geyuan Jiang,Jianfei Zhou,Dawei Zhao,Haipeng Yu
Achieving rubber-like stretchability in cellulose ionogels presents a substantial challenge due to the intrinsically extended chain configuration of cellulose. Inspired by the molecular configuration of natural rubber, we address this challenge by using cyanoethyl as a substitute for 1.5 hydroxyl on the D-glucose unit of cellulose. This strategy innovatively triggers the transformation of cellulose molecules into a coiled chain configuration, facilitating the creation of an ultra-stretchable ionogel free from any petrochemical polymers. The resultant ionogel demonstrates mechanical ductility comparable to that of a rubber band, achieving an elongation strain of nearly 1,000% while maintaining a tensile strength of up to 1.8 MPa and exhibiting a biomodulus akin to that of human skin, recorded at 63 kPa. Additionally, this stretchable ionogel presents skin-like self-healing behavior, favorable biocompatibility, and noteworthy thermoelectric properties, highlighted by a Seebeck coefficient of approximately 68 mV K−1. This study delineates a feasible molecular approach for developing stretchable ionogels from biomass resources, potentially revolutionizing self-powered stretchable electronics for integration with human tissues and skin.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Ziwei Wu,Yiyang Chen,Xue Gong,Shimeng Yang,Haozhe Xue,Chunzhe Jin,Chengyuan Pan,Dayu Zhang,Yongjian Xie
In this study, a cellulase-responsive controlled-release formulation (FPR-HMS-HPC) was developed by grafting hydroxypropyl cellulose (HPC) onto fipronil (FPR) loaded hollow mesoporous silica (HMS) nanoparticles via ester linkage. The FPR-HMS-HPC formulation was characterized using scanning and transmission electron microscopies, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The results indicated that FPR-HMS-HPC exhibited a high loading capacity of 10.0 % ( w /w) and demonstrated favorable responsiveness to cellulase enzyme. Moreover, its insecticidal efficacy against Reticulitermes flaviceps surpassed that of an equivalent dose of FPR. Toxicology studies showed that the mortality and hatching rates of zebrafish exposed to FPR-HMS-HPC nanoparticles were reduced by >6.5 and 8.0 times, respectively. Thus, HPC-anchored HMS nanoparticles as insecticide delivery systems present a sustainable method for pest control significantly reducing harm to non-target organisms and the environment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Tongjun Yang,Junpeng Xu,Hailiang Sheng,Junqin Wang,Gang Hu,Songmiao Liang,Lijie Hu,Lihua Zhang,Haibo Xie
The CO 2 -based reversible ionic liquid solution of 1,1,3,3-tetramethylguanidine (TMG) and ethylene glycol (EG) in dimethyl sulfoxide (DMSO) after capturing CO 2 , (2[TMGH] + [O 2 COCH 2 CH 2 OCO 2 ] 2− /DMSO ( χ RILs = 0.1), provides a sustainable and effective platform for cellulose dissolution and homogeneous utilization. Highly porous cellulose aerogel beads and monoliths were successfully prepared via a sol-gel process by extruding cellulose solution into different coagulation baths (NaOH aqueous solution or alcohols) and exposing the cellulose solution in open environment, respectively, and followed by different drying techniques, including supercritical CO 2 -drying, freeze-drying and air-drying. The effect of the coagulation baths and drying protocols on the multi-scale structure of the as-prepared cellulose aerogel beads and monoliths were studied in detail, and the sol-gel transition mechanism was also studied by the solvatochromic parameters determination. High specific surface area of 252 and 207 m 2 /g for aerogel beads and monoliths were achieved, respectively. The potential of cellulose aerogels in dye adsorption was demonstrated.
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ChemistrySelect
·
2024
·Vol. 9
·期 43
·e202402801
·
IF 1.9
Yang Li,Zhongming Liu,Shoujuan Wang,Fangong Kong
Graphical Cellulose composite aerogel with a rich three-dimensional network structure, low density, and high porosity is successfully obtained by the in situ self-polymerization of dopamine and acrylamide in an alkaline urine system. Cellulose composite aerogel exhibits high adsorption capacities and recyclability for methylene blue dye, which is higher than those reported for other bio-based adsorbents. Cellulose-based “biomass” adsorptive materials have gained significant attention because of their effectiveness in various applications. In this study, a cellulose composite aerogel with a rich three-dimensional network structure, low density, and high porosity was successfully obtained by the in situ self-polymerization of dopamine (DA) and acrylamide (AM) in an alkaline urine system. Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, elemental analysis, and other analytical techniques were used to analyze the physical and chemical structures of the cellulose composite aerogels. The results revealed that the introduction of DA and AM into the aerogel enhanced the adsorption and mechanical properties of the active sites, thereby boosting adsorption capacity and recyclability. By optimizing the adsorption of methylene blue (MB) dye using a cellulose composite aerogel, a maximum adsorption capacity of 406.89 mg g was obtained. The MB dye adsorption curve of the cellulose composite aerogel conformed to the Langmuir model, which indicates high adsorption capacity and recyclability. This confirms the high application potential of the cellulose composite aerogel in wastewater treatments.
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Journal of Energy Storage
·
2024
·
IF 8.9
Ying Kang,Weixiang Chen,Jianguo Huang
Vanadium-sulfides are considered as promising anodic materials for lithium-ion batteries (LIBs) due to their unique layered structures and high theoretical capacities. However, the main challenge of vanadium-sulfide as an electrode material is still faced with slow Li-ion diffusion kinetics and inevitable structural damage during charging/discharging processes. Herein, a series of bio-inspired hierarchical fibrous VS 4 /C composites were designed based on cellulose substance as the scaffold and carbon source via simple hydrothermal method. The resultant fibrous VS 4 /C composites possessed a three-dimensional porous network structure consisting of carbon fibers coated with VS 4 nanosheets. As a consequence, the optimized VS 4 /C anodic materials exhibit high reversible capacities (953 mAh g −1 at 0.1 A g −1 ), good rate features (420 mAh g −1 at 2 A g −1 ), and fast diffusion kinetics. The superior electrochemical properties of the VS 4 /C composites are mainly attributed to the three-dimensional porous network structures combined with the carbon fibers matrix, which promotes the contact between the electrode and electrolyte, alleviates the structural damage of VS 4 , as well as facilitates the electron transfer and Li-ion diffusion during the cycling processes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Bo He,Yunfei Lin,Qi Zhou,Shaokun Tang
Covalent organic framework (COF) nanosheets have been considered as promising materials for proton exchange membranes (PEM) due to their orderly, adjustable pores and relatively improved membrane forming properties. Here, we introduced the one-dimensional sulfonated bacterial cellulose nanofibers (SBCNF), originating from coconut and binding TpBd-2SO 3 H nanosheets to prepare a series of SBCNF/TpBd-2SO 3 H composite membranes . The composite membranes present a typical layered structure due to the presence of SBCNF. Moreover, extensive hydrogen bond network is formed between the embedded TpBd-2SO 3 H nanosheets and SBCNF, which is beneficial for improving the proton conductivity and mechanical strength of the membrane. As a result, the composite membrane achieved a proton conductivity of 147.5 mS/cm at 80 °C, 100 %RH and a highest tensile strength of 88.49 MPa.
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