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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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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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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Biomaterials Advances
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2022
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IF 0
Wenjie Zhang,Xiaoxue Wang,Juping Ma,Rong Yang,Yi Hu,Xiaoyan Tan,Bo Chi
The clinical acceleration of skin autogenous healing remains a great challenge, especially in the early stage after injury. In this work, a novel directly injectable hydrogel with high self-adaptability is designed as a provisional matrix to close the apposition of wound edges, using carboxymethyl cellulose and poly (γ-glutamic acid) through Schiff-base reaction. Benefiting from the dynamic covalent cross-linking structure, the functional biodegradable hydrogels are easy to prepare (gel time 5–180 s), demonstrating adequate mechanical strength (40–120 kPa), anti-fatigue abilities, and rapid self-healing (5–10 min at skin defect). Furthermore, the hydrogels exhibit biocompatibility and proliferation-promoting activity with murine fibroblasts. In the full-thickness dermal animal models, it significantly promoted collagen deposition, skin-function restoration, and VEGF expression. This hydrogel shows potential as a dressing available for skin regeneration during the healing of dermal injuries.
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CHEMOSPHERE
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2022
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IF 8.943
Tingting Luo,Runkai Wang,Fei Chai,Lei Jiang,Pinhua Rao,Lili Yan,Xinjian Hu,Wei Zhang,Lianghuan Wei,Alireza Khataee,Ning Han
The manganese is successfully induced as a “bridge joint” to fabricate a new adsorbent (CNC–Mn-PEI) connecting cellulose nanocrystal (CNC) and polyethyleneimine (PEI) respectively. It was used to remove As (III) from waste water. It has been proved that the incompact CNC and PEI were successfully connected by Mn ions, which induced the formation of O–Mn–O bonds and the removal efficiency is maintained in the broad pH range of 4–8, even with the influence of NO 3 − and CO 3 2− . The CNC–Mn-PEI was characterized by Brunauer–Emmett–Telley (BET) method and the results showed that the nanoparticle of the specific surface area was 106.5753 m 2 /g, it has a significant improvement, compared with CNC–Mn-DW (0.1918 m 2 /g). The isotherm and kinetic parameters of arsenic removal on CNC–Mn-PEI were well-fitted by the Langmuir and pseudo-second-order models. The maximum adsorption capacities toward As (III) was 78.02 mg/g. After seven regeneration cycles, the removal of As (III) by the adsorbent decreased from 80.78% to 68.2%. Additionally, the hypothetical adsorption mechanism of “bridge joint” effect was established by FTIR and XPS, which provided the three activated sites from CNC–Mn-PEI can improve the arsenic removal efficiency, and providing a new stratagem for the arsenic pollution treatment.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Qingtao Zeng,Yinan Zhao,Xuejun Lai,Changcheng Jiang,Binglin Wang,Hongqiang Li,Xingrong Zeng,Zhonghua Chen
The development of flame-retardant coating with sensitive fire warning is imperative but highly challenging in the “Internet of Everything Era”. In this study, a multifunctional fire protection nanocoating (MFNC) was fabricated on the surface of flammable materials by dip-coating Ti 3 C 2 T X (MXene), montmorillonite (MMT) nanosheet , and 2-ureido-4[1H]-pyrimidinone-containing cellulose (UPC) via layer-by-layer assembly. The MXene/UPC layer endowed the nanocoating with accurate temperature sensing capability because of the outstanding conductivity and unique thermoelectric characteristic of MXene. When being burnt, MFNC was able to trigger the fire-warning system in less than 4 s. Owing to the MMT/UPC layer, MFNC showed excellent flame retardancy due to the barrier and catalytic carbonization of MMT. MFNC led to the increase in the limiting oxygen index of the flammable materials by up to 40.0% and the vertical burning test reached the UL94 V-0 rating. More importantly, attributed to the multiple hydrogen bond interactions of UPC, MFNC displayed good self-healing capability. Its fire-warning performance could quickly recover after being damaged. Furthermore, MFNC exhibited sensitive piezoresistive sensing ability, which makes it a promising candidate for application in firefighter motion detection. Our work provides new insights into the fabrication and application of multifunctional smart and efficient fire-protection coatings.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Jia Wei,Hongshuai Gao,Yao Li,Yi Nie
Utilizing phosphate-based ionic liquids (ILs) solvents for dissolving cellulose to prepare cellulose fibers has attracted much attention for its convenience, high yield, stability and sustainability. However, the degradation behavior during dissolving of cellulose in ILs, which is an important factor for fabricating cellulose fiber, is still unclear. In this work, the degradation of wood pulped cellulose (WPC) in three kinds of phosphate-based ILs: 1-ethyl-3-methylimidazolium dimethyl phosphate ([Emim]DMP), 1-ethyl-3-methylimidazolium diethyl phosphate ([Emim]DEP) and 1-butyl-3-ethylimidazolium diethyl phosphate ([Beim]DEP), were systematically investigated at different dissolution temperatures and dissolution times. The results indicated that the degradation degree of WPC in three ILs follows the order of [Emim]DEP > [Beim]DEP > [Emim]DMP, which is consistent with interaction results obtained by quantum chemical calculation, and degradation degree increases follows the rising of dissolution temperature and the accumulation of dissolution time. Moreover, no reducing sugar (RS) was found in any recycled ILs even when the degree of polymerization (DP) of regenerated cellulose (RC) decreased by 30.4%. In addition, according to the Fourier transform infrared and X-ray diffraction data, the results further proved that the crystallization type of RC changed from type Ⅰ to type Ⅱ. Here, preferable dissolving parameters and experiments data of multiple conditions are provided, which may provide practical reference and guidance for both scientific research and industrial.
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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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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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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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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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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Xiaochun Ma,Zhaodong Zhu,Haichuan Zhang,Shenglong Tian,Xiaohong Li,Huiming Fan,Shiyu Fu
Deacidification and surface self-cleaning are of great significance for the long-term preservation of historic literature. Herein, a superhydrophobic self-cleaning coating, derived from nanocellulose coated with CaCO 3 particles is constructed via chemical vapor deposition (CVD) for the first time for the preservation of historic paper. The static contact angle of superhydrophobic paper reached more than 150° and the minimum sliding angle was 6.4°. Deacidification effect was achieved with a desired pH value in the range from 7.50 to 7.77 and the maximum alkali storage was up to 1.235 mol/kg. It is found that the low-cost CaCO 3 nanoparticles can not only remove the acid substances, but also gave the paper function of self-cleaning, which is very great significant for the protection of paper-based relics.
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危险品化学品经营许可证（带存储）