JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Shengpeng Jiang,Jiahui Wu,Bingrong Ma,Meihong Liu,Sanchuan Yu,Congjie Gao
This work focused on the construction of an acid-resistant composite nanofiltration membrane with the selective layer of bulk cross-linked hydroxyethyl cellulose (HEC)-silica and a support of porous polypropylene . Membranes were fabricated through in-situ sol-gel reaction and slot-die coating method employing tetraethyl orthosilicate (TEOS) as the silica precursor and cross-linking agent of HEC. Membrane structure and performance were tuned by controlling the hydrolysis time of TEOS and differentiating TEOS and HEC contents, and systematically characterized in terms of physico-chemical property, permeation attribution and acid stability. It was found that membrane performance was strongly correlated with the relative contents of C–O–Si and Si–O–Si bonds of the formed HEC-silica selective layer. High content of C–O–Si bond formed via condensation reaction of HEC and TEOS endowed the selective layer with denser network structure and good rejection ability. Both insufficient and excessive hydrolysis led to a poor rejection ability of formed membrane. The optimized HEC-silica membrane possessed an average pore size of about 1.43 nm within the scope of nanofiltration membrane, a high pure water permeability coefficient of around 10.5 LMH/bar, and a medium rejection of 85.2% to 500 mg/l Na 2 SO 4 aqueous solution at 5.0 bar. No changes in both chemical structure and separation performance occurred with the HEC-silica composite membrane after being soaked in aqueous H 2 SO 4 solution of 4.9 wt% for 7 days, while evident structure destruction and serious performance degradation occurred with the compared polyamide-based commercial membrane NF270. Long-term soaking test using 15.0 wt% H 2 SO 4 aqueous solution for 30 days also demonstrated that the acid resistance HEC silica membrane was comparable with those reported acid stable nanofiltration membranes. Furthermore, the HEC-silica membrane also maintained its water permeation and solute rejection abilities during a 30-day continuous filtration of aqueous solution of 4.9 wt% H 2 SO 4 and 50 mg/l polyethylene glycol fraction (PEG2000). The good acid resistance of the HEC-silica composite membrane was attributed to its bulk cross-linked network structure composed of C–O–Si, Si–O–Si and C–C bonds.
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Frontiers in Bioengineering and Biotechnology
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2022
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IF 6.064
Lu Haibin,Li Xiaoling,Zhang Mu,Xu Changpeng,Li Wenqiang,Wan Lei
Wound healing of skin defects remains a significant clinical problem due to inflammation, infection, and dysangiogenesis; especially, the promotion of microvasculature formation in healing of chronic wound or deep skin defects is critical as it supplies oxygen and nutrients to the impaired tissue, relieving uncontrolled inflammatory responses. The cellulose nanocrystals (CNCs) in the liquid crystalline phase, which facilitates cell proliferation and migration, has been shown to improve vascularization effectively. Therefore, we developed a novel injectable hydrogel based on Schiff base and coordination of catechol and Ag. The obtained hydrogels (CCS/CCHO-Ag) exhibited in situ forming properties, satisfactory mechanical performance, controlled release of Ag, antibacterial capacity, and biocompatibility. In addition, the hydrogels could also entirely cover and firmly attach wounds with irregular shapes, so as to reduce the re-injury rate. More importantly, experiments in vitro and in vivo demonstrated that CCS/CCHO-Ag hydrogels can promote neovascularization and tissue regeneration, thanks to their anti-inflammatory and antibacterial effects. In conclusion, these multifunctional hydrogels are well on the way to becoming competitive biomedical dressings, which show tremendous potential application in the field of tissue engineering.
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BIOMACROMOLECULES
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2022
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IF 6.978
Zi-li Wang,Qiang Wang,Xiu Dong,Dong Li,Lan Bai,Xiu-li Wang,Yu-zhong Wang,Fei Song
Recent advances in structural-color cellulose nanocrystal (CNC) materials have been made toward chemical sensing applications; however, such materials lack sufficient color chroma for naked-eye observation, and their selective recognition to given chemicals as well as the corresponding mechanism has rarely been reported. Here, a dopamine-infiltration and post-polymerization approach is proposed to construct vivid structural-color composite films. The chiral nematic structure of CNC enables the structural coloration, while the strong light absorption of the polymeric co-phase, polydopamine (PDA) enhances the color chroma and visibility. By controlling the PDA amount, the composite films can detect organic solvents quantitatively and selectively via visible color changes. From the viewpoint of the compatibility and similitude principle, notably, a critical solubility parameter distance (R0) between PDA and “active” solvents is defined with a three-dimensional Hansen solubility sphere; this well constructs a rule for the sensing selectivity of the chemochromic composite films. The findings pave the foundation for the design of colorimetric sensors with specifically testing objects.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Shan Jiang,Jianfeng Xi,Hongqi Dai,Weibing Wu,Huining Xiao
The rapid and efficient treatment of complex wastewater remains challenging. Herein, green paper-based materials with high wet strength, good oil-water separation property and high heavy metal ion adsorption capacity were prepared via a facile, cost-effective process. The introduction of amphoteric functional groups not only met the requirements for heavy metal ion adsorption, but also maintained the stable underwater superoleophobic properties of materials a wide pH range. The covalent crosslinking between cellulose fibers induced by polyethyleneimine and citric acid significantly improved the wet strength (up to 26.0 Nm/g) and the porosity. The membrane flux was increased up to 3515 L/(m 2 ·h) and the separation efficiencies were higher than 98%. Moreover, the theoretical maximum adsorption capacities for Cd(II) and Pb(II) reached 73.29 and 93.75 mg/g, respectively. Combined with filtration technology, the materials can realize the continuous and efficient purification of complex wastewater.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 43
·20900-20908
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IF 3.925
Jiawen Zheng,Yong Sun,Shuliang Yang,Zheng Li,Xing Tang,Xianhai Zeng,Lu Lin
Hydrogels have been considered one of the most promising materials for high-sensitivity sensors to instantaneously detect human physiological activities. However, fabricating a flexible hydrogel combining toughness, ionic conductivity, and anti-freezing capability is still a challenge. In this work, new interpenetrating polymer network (IPN)-structured hydrogels with stretchable, tough, and conductive properties were fabricated based on chemical cross-linked poly(acrylic acid) and physically cross-linked poly(vinyl alcohol). The introduction of cellulose nanocrystal (CNC) chains significantly enhanced the tensile strength and toughness. In particular, the introduction of the ethylene/water binary solvent maintained its original flexibility even after 24 hours of freezing at −20 °C. In addition, the developed hydrogel-based sensor was capable of differentiating accurately large and small movements of the human body, such as limb rotation, finger bending, and heartbeat.
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CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Feng Lin,Bing Xue,Hao Huang,Liping Zhu,Shuguang Yang
Using sustainable cellulose and its derivatives to prepare optical diffuser is an economic and green approach. Herein, we report a novel optical diffuser constructed by interfacial assembly of cellulose ether (CE) and polymer complex particles (PCP) on flexible and transparent poly(ethylene terephthalate) (PET) substrate. Owning to the rich hydroxyl groups of CEs, the complex thin film can be further crosslinked by thermal treatment which greatly improves the optical diffusion performance and durability. Without crosslinking, haze (H) of the cellulose complex film is about 81 %, and the film will dissolve in high pH value solution. While after the proper crosslinking, H of the film increases to 95 %, and the film can resist the erosion of high pH solution. Moreover, CE/PCP complex film shows improved anti-bending capacity compared with commercially available optical diffuser for liquid crystal display .
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CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Yang Hu,Minzhang Chen,Chaoran Qin,Jipeng Zhang,Ang Lu
Natural polymer-based thermoelectric materials are significant for sustainable development because they can be used to directly harvest heat into electricity while avoiding the utilization of petroleum-based resources. Herein, cellulose ionic conductors were fabricated by using cellulose as the hydrogel matrix and cellulose solvents as the electrolytes. p -type and n -type thermoelectric generators (TEG) based on cellulose ionic conductor were obtained, with Seebeck coefficient of 2.61 and −1.33 mV/K, due to the different interactions between quaternary ammonium cations and cellulose. The cellulose TEG-based supercapacitor showed a high specific capacitance and the ability of charging with thermal energy and powering electronic devices with a maximum power density of 0.42 mW/m 2 . Moreover, a flexible module-type TE harvester with 10 pairs of p - n legs was assembled for body heat harvesting, delivering a thermovoltage of 0.42 V for a temperature gradient of 13 K, enabling waste/biological heat conversion, temperature monitoring and temperature control.
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FOOD CHEMISTRY
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2022
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IF 9.231
Ying Wan,Jian Li,Jitong Ma,Yanan Li,Ren Wang,Zhengxing Chen,Tao Wang
In this study, co-assembled protein-polysaccharide complexes (ZCs) were prepared by fixing zein nanoparticles at the fibrillar carboxymethyl cellulose (CMC) by pH-driven anti-solvent precipitation. The complexation boosted the dispersity of zein from 17.3% to 88.6%. Scanning electron microscopy and atomic force microscopy confirmed the formation of network structures where the fibrous polysaccharides inserted into the interval of granular proteins. Circular dichroism spectrum, fluorescence spectrum, and X-ray diffraction verified the electrostatic interaction pattern between zein and CMC. Besides, the ZCs presented favorable amphiphilic properties, and the electrostatic interaction between zein and CMC can be fine-tuned by the substitution degree (DS) of carboxymethyl in CMC. Therefore, the Pickering emulsions stabilized by ZCs had controllable size and long-term stability using DS as a stimulus. Our study offers a novel strategy developing bio-based materials as novel stabilizers of Pickering emulsions.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2022
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IF 9.879
Quan Wang,Xueqing Liu,Zhe Qiang,Zhendong Hu,Xin Cui,Huaixiao Wei,Jinjin Hu,Yuming Xia,Shuohan Huang,Jianming Zhang,Kun (Kelvin) Fu,Yuwei Chen
Photocuring-based 3D printing becomes an emerging technology in various applications owing to their advantages of high design flexibility and low cost. Developing 3D printing resins with high dielectric constant is important for enabling on-demand manufacturing of energy storage materials . Herein, we report a scalable and simple approach for preparing ultraviolet (UV) curable resin composite with high dielectric constant, through the introduction of cellulose nanocrystals (CNCs) as bio-fillers into methacrylate malate photocurable resins (MMPR). MMPR resin was synthesized by reacting methacrylic acid (MAA) with malate resin (MR), while CNCs were also grafted to MAA for allowing the uniform dispersion of fillers in the polymer matrix . Subsequently, high dielectric constant composite resin CNCs-MAA/MMPR was prepared by simply mixing CNCs-MAA with MMPR and the dielectric constant of materials can be manipulated by varying the content of CNCs-MAA particles. Specifically, with the addition of 1 wt% CNCs-MAA, the dielectric constant increases from 4.0 (MMPR) to 10.9 at 1 MHz, which can be attributed to the interfacial effect between CNCs-MAA and MMPR matrix and the abundant presence of polar groups (-OH) from CNCs surface. The prepared resin composite can be directly used for conventional 3D printing technologies. Specifically, practical use of CNCs-MAA/MMPR composites for energy storage was demonstrated, which the capacitance of MAA/MMPR resin with 1 wt% CNCs increases more than 132% compared to pristine MMPR. This work provides an industrially feasible method for preparing photocurable resin composites with high dielectric constants for 3D printing.
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CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Jinqiang Sun,Mengge Shang,Minna Zhang,Shimo Yu,Zhipeng Yuan,Xibin Yi,Serguei Filatov,Jing Zhang
Biomass aerogels are attractive in various applications owing to their inherent advantages of renewability, biodegradability and eco-friendly. Herein, a novel composite aerogel of konjac glucomannan (KGM)/TEMPO-oxidized cellulose nanofibers (TOCNF)@HKUST-1 (KTA@HKUST-1) is prepared through a facile vacuum impregnation method combined with the directional freeze-drying process, which using KGM and TOCNF as raw materials. The structural analyses disclose that the KTA@HKUST-1 has a hierarchical porosity, in which HKUST-1 can provide micropores for adsorption, while the meso -/macropores from KTA act as high-speed channels to improve diffusion and mass transfer rate to transport CO 2 components into the micropores of HKUST-1. The experiment results of KTA@HKUST-1-10 (KTA@H10) show that the CO 2 adsorption capacity can reach 3.50 mmol·g −1 at 1 bar and 298 K, and the adsorption capacity retention rate as high as 91.43% after 7 cycles. In addition, the CO 2 /N 2 adsorption selectivity of KTA@H10 can reach 18.42, which has an excellent potential for selective CO 2 adsorption.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2022
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IF 6.437
Haoran Yuan,Chengyu Li,Rui Shan,Jun Zhang,Lingjun Zhu,Yong Chen
In the present study, a series of municipal sludge derived solid acids, synthesized through hydrothermal pre-carbonization coupled with secondary pyrolysis method, were developed for levoglucosenone (LGO) production via cellulose fast pyrolysis . Specific physico-chemical characterizations such as XRD, FTIR, N 2 adsorption-desorption, NH 3 -TPD, etc., were undertaken to reveal the structural properties of as-prepared solid acids. Phosphoric acid and sulfuric acid decorated municipal sludge derived carbon-based materials containing abundant Brønsted acid sites remarkably facilitated the selective formation of LGO. Particularly, high LGO yield (~20 wt%) were achieved using both phosphoric and sulfonic acid functionalized municipal sludge derived porous carbon. The as-prepared municipal sludge derived solid acids could be reused for multiple cycles in LGO preparation without significant decline in pyrolysis performance. This research will provide good reference for the resource utilization of lignocellulosic biomass and municipal sludge, particularly in the aspect of valuable chemicals manufacture.
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Frontiers in Bioengineering and Biotechnology
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2022
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IF 6.064
Donglei Liu,Hao Zhang,Xufeng Dong,Lin Sang,Min Qi
Cartilage tissue engineering technology provides a solution for treating osteoarthritis. Based on the viscoelastic nature of articular cartilage, many viscoelastic hydrogel scaffolds have been developed for investigating the effects on chondrocyte behaviors. However, cellulose nanocrystal/collagen (CNC/COL) hydrogels have not been used as a viscoelastic microenvironment to study chondrocyte growth. Here, we prepared CNC/COL hydrogels with tunable viscoelastic properties and investigated their influences on chondrocyte behaviors. The results showed that CNC and COL within the hydrogels are bonded by hydrogen bonds. The hydrogels had a microporous structure, and the viscoelastic properties were enhanced by increasing the concentration of CNC. Moreover, enhancing the hydrogel viscoelastic properties, including stress relaxation, creep, storage modulus, and loss modulus, promoted the cell shape change, proliferation, and matrix deposition and reduced the IL-1β level. Using a principal component analysis (PCA), stress relaxation was assessed to have the strongest correlation with chondrocytes behaviors, with an authority weight value of 62.547%. More importantly, FAK and YAP were involved in the chondrocytes' response to the rapid relaxing hydrogel by immunofluorescence staining.
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