ACS Sustainable Chemistry & Engineering
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2023
·
IF 8.4
Hongyang Li,Chengzhi Hu,Yanhui Jiang,Jie Zhu,Yichuan He,Xianfeng Hu,Dawei Tang
Solid–liquid phase change materials (PCMs) with large latent heat can efficiently weaken thermal peaks, thus alleviating the thermal discomfort of human beings caused by electronic devices. However, the leakage during the melting process and the low thermal conductivity severely limit their application in electronic thermal management. In this study, a flexible and leakage-proof sodium alginate-based phase change composite film (PCCF) was first fabricated via a facile and green synthesis method with the assistance of stainless steel meshes, and its synthetic size could be easily regulated via a mold. Multiwall carbon nanotubes (MWCNTs) were used to enhance the thermal conductivity of the PCCF. Through the leakage prevention tests, it can be found that the PCCF-0.7 (the mass fraction of polyethylene glycol (PEG) was 70%) exhibited leakage proof under an external force. The phase change enthalpy of the PCCF-0.7 reached 100.05 J/g, and the enthalpy retention rate reached 76%. The radial thermal conductivity of PCCF-0.7 (contains 8 wt % MWCNTs) was 3.52 W/(m·K), 3810% higher than that of pure PEG. The heat transfer experiment demonstrated that the PCCF could efficiently store thermal energy; the maximum temperature of the analog smartphone could be reduced by 5.3 °C. Hence, the prepared PCCF is suitable for providing thermal comfort to electronic devices, and it is sustainable and eco-friendly.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yu Du,Qizhen Zhang,Manli Yu,Mingming Yin,Fuliang Chen
Lead is highly persistent and toxic in soil, hindering plant growth. Microspheres are a novel, functional, and slow-release preparation commonly used for controlled release of agricultural chemicals. However, their application in the remediation of Pb-contaminated soil has not been studied; furthermore, the remediation mechanism involved has not been systematically assessed. Herein, we evaluated the Pb stress mitigation ability of sodium alginate–gelatin–polyvinyl pyrrolidone composite microspheres. Microspheres effectively attenuated the Pb toxic effect on cucumber seedlings. Furthermore, they boosted cucumber growth, increased peroxidase activity, and chlorophyll content, while reducing malondialdehyde content in leaves. Microspheres promoted Pb enrichment in cucumber, especially in roots (about 4.5 times). They also improved soil physicochemical properties, promoted enzyme activity, and increased soil available Pb concentration in the short term. In addition, microspheres selectively enriched functional (heavy metal-tolerating and plant growth promoting) bacteria to adapt to and resist Pb stress by improving soil properties and nutrients. These results indicated that even a small amount (0.025–0.3 %) of microspheres can significantly reduce the adverse effects of Pb on plants, soil, and bacterial communities. Composite microspheres have shown great value in Pb remediation, and their application potential in phytoremediation is also worth evaluating to expand the application.
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Materials Today Communications
·
2023
·
IF 3.8
Qian Li,Ruijie Ai,Junping Fan,Xue Fu,Liqing Zhu,Qianyu Zhou,Libo Chen,Wenrui Ma,Yonghao Li,Lulu Liu
Bacterial infections pose a significant challenge to global public health, and the development of innovative antibacterial materials is becoming increasingly urgent. Currently, hydrogels are widely studied for the treatment of bacterial infection. However, it is still a great challenge to load antibacterial nanoparticles into the hydrogel matrix by using green synthesis method. Tannic acid (TA) is an eco-friendly reducing agent for the synthesis of metal nanoparticles, and it also has antibacterial activity. In this paper, an antibacterial chitosan/sodium alginate (HCS/SA) hydrogel film embedded with AgNPs was fabricated through in-situ green reduction with TA to utilize the synergistic antibacterial effect of TA and silver nanoparticles (AgNPs). The chemical composition and morphology of the antibacterial hydrogel were characterized by using FTIR, XRD, SEM, and EDS. The results demonstrated that TA solution under alkaline conditions could convert AgNO 3 to AgNPs, and AgNPs were embedded uniformly on the surface of the HCS/SA hydrogel film. In addition, the pH of the TA solution significantly influenced the swelling behavior of the antibacterial hydrogel films. When the pH of the TA solution increased from 7 to 10, the swelling ratio of the antibacterial hydrogel film increased from 388.89% to 648.69%. In addition, the hemolysis rates of our prepared hydrogel films were below 5%, meeting the safety requirements. In vitro antibacterial experiments revealed that the fabricated hydrogel films showed excellent antibacterial effects against E. coli, S. aureus, and P. aeruginosa with inhibition zones up to 25.8±0.24 mm, 32.2±0.62 mm, and 22.6±0.49 mm, respectively. Therefore, the antibacterial hydrogel films developed in this study hold potential for treating bacteria-infected wounds.
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Journal of the Mechanical Behavior of Biomedical Materials
·
2023
·
IF 3.9
Xiaoli Qin,Siqi Lei,Kefan Yang,Weibo Xie,Jinqing Wang
Developing a novel bioactive material as a barrier membrane for guided bone regeneration (GBR) surgery remains challenging. As a new member of two-dimensional (2D) material family, MXene is a promising candidate component for barrier membranes due to its high specific surface area and osteogenic differentiation ability. In this work, a green and simple SA/glycerol/MXene (SgM) composite membrane was prepared via solvent casting method by using sodium alginate (SA) and MXene (M) as raw materials while employing glycerol (g) as a plasticizer . The addition of glycerol significantly increased the elongation at the break of SA from 10%-20% to 240%–360%, while the introduction of MXene promoted the deposition of calcium and phosphorus to form hydroxyapatite . At the same time, the roughness of the SgM composite membrane is apparently improved, which is conducive to cell adhesion and proliferation. This work provides a basis for further research on SgM composite membrane as GBR membrane for the treatment of bone defects.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 26
·e53999
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IF 3
Pengcheng Zhu,Shumin Zhuo,Weiying Zhang,Xiaoguang Ying,Jianying Huang,Xiao Li
Microbial fuel cells (MFCs) are a potential biotechnology for simultaneous degradation of organic wastewater and power generation. In this paper, a biocompatible composite is constructed around a copper mesh with sodium alginate/agar and activated carbon (CM-SA/AC) and acts as an efficient anode for MFCs after being microbe immobilized. The power performance of the MFC with CM-SA/AC anode is investigated. The results show that the addition of activated carbon is conducive to the immobilization of bacteria on CM-SA/AC anode and fast start-up of MFCs. The power density reaches 1088.6 mW/m 2 , which is 2.03 times and 1.75 times that of CM-SA (without activated carbon) anode and carbon felt anode, respectively. In case of a candied wastewater treatment, the MFC with immobilized CM-SA/AC anode exhibits a much higher power density (724.5 mW/m 2 ) than that with carbon felt anode (145.0 mW/m 2 ), together with a longer stabilization time and a smaller charge-transfer resistance. The total removal rate of chemical oxygen demand (COD) reaches 79.4 ± 0.65%. The present study will facilitate the development of inexpensive and biocompatible anodes to facilitate the application of MFCs in wastewater treatment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Bo Cao,Cunjin Wang,Pengqi Guo,Qun Zhang,Chunting Wang,Hanhan Sun,Huiyun Wen,Xin Chen,Yaru Wang,Yao Wang,Saipeng Huang,Weiming Xue
The diabetic wound is hard to repair due to bacterial infection, lasting inflammation, and so on. Therefore, it is vital to fabricate a multi-functional hydrogel dressing for the diabetic wound. In this study, a kind of dual-network hydrogel loaded with gentamicin sulfate (GS) based on sodium alginate oxide (OSA) and glycidyl methacrylate gelatin (GelGMA) was designed through the Schiff base bonding and photo-crosslinking to promote the diabetic wound healing. The hydrogels exhibited stable mechanical properties, high water absorbency, and good biocompatibility and biodegradability . Antibacterial results showed that gentamicin sulfate (GS) had a remarkable antibacterial effect on Staphylococcus aureus and Escherichia coli . In a diabetic full-thickness skin wound model, the GelGMA-OSA@GS hydrogel dressing dramatically decreases inflammation and accelerated re-epithelialization and granulation tissue formation, promising applications in promoting diabetic wound healing.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Mengge Shang,Xiaoqian Peng,Jing Zhang,Xiaochan Liu,Zhipeng Yuan,Xinfu Zhao,Sijia Liu,Shimo Yu,Xibin Yi,Serguei Filatov
Adsorption natural gas (ANG) is a technology in which natural gas is stored on the surface of porous materials at relatively low pressures, which are promising candidates for adsorption of natural gas. Adsorbent materials with a large surface area and porous structure plays a significant role in the ANG technology, which holds promise in increasing the storage density for natural gas while decreasing the operating pressure. Here, we demonstrate a facile synthetic method for rational construction of a sodium alginate (SA)/ZIF-8 composite carbon aerogel (AZSCA) by incorporating ZIF-8 particles into SA aerogel through a directional freeze-drying method followed by the carbonization process. The structure characterization shows that AZSCA has a hierarchical porous structure, in which the micropores originated from MOF while the mesopores are derived from the three-dimensional network of the aerogel. The experimental results show that AZSCA achieved high methane adsorption of 181 cm3·g–1 at 65 bar and 298 K, along with higher isosteric heat of adsorption (Qst) throughout the adsorption range. Thus, the combination of MOF powders with aerogel can find potential applications in other gas adsorption.
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EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Lu Wang,Xin Gang,Yu Xiao,Yi Ren,Jianhong Wang,Baolong Niu,Wenfeng Li
In this study, CMCS-CuO nanoparticles were added to the SA matrix by blending method to prepare SA/CMCS-CuO composite microspheres. The chemical structure and morphology of the composite beads were characterized. The results showed that there was a certain molecular interaction between CMCS-CuO NPs and SA matrix. The swelling experiment showed that with the increase of the mass of CMCS-CuO NPs, the maximum swelling ratio of gel microspheres decreased from 49.83% to 38.2%, and the time to reach the maximum swelling ratio also increased from 8 h to 11 h. Cytotoxicity test, hemolysis test, and cell migration test showed that the composite microspheres had good biocompatibility. Curcumin was added to the composite bead matrix by the blending method, and curcumin-loaded SA/CMCS-CuO composite beads were prepared by the crosslinking method. In vitro release experiments showed that SA/CMCS-CuO composite microspheres had good pH sensitivity, and the addition of CMCS-CuO NPs prolonged the in vitro release time of cur. It has certain application potential in the field of drug release.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 14
·6739-6748
·
IF 3.3
Chuanyu Zhu,Zhongmin Feng,Yupu Meng,Min Wang,Zhuqing Wang
In this study, a novel sodium alginate–streptomycin sulfate composite aerogel (Alg–Stre) was synthesized by using chemical grafting and vacuum freeze-drying techniques to remove heavy metal ions from water. The experimental results show that the prepared Alg–Stre can effectively remove heavy metal ions such as Pb2+ and Cu2+ from water. Among these ions, Alg–Stre demonstrated the best removal effects for Pb2+ (99.8%, 0.1 mM) and Cu2+ (94.6%, 0.1 mM) in water. The utmost adsorption capacities of Alg–Stre for Pb2+ and Cu2+ are 280 mg g−1 and 160.2 mg g−1, respectively, which are competitive with those of most reported Pb2+- or Cu2+-sorbents. In addition, the adsorption abilities of Alg–Stre for Pb2+ and Cu2+ remained stable in solution pH values of 3.0 to 6.0 and at ambient temperatures of 20 °C to 50 °C. The simple preparation process, high removal efficiency, suitability for different environments and conditions, and recyclability of Alg–Stre confirm the broad application prospects of this material in the field of sewage disposal.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
Manli Yang,Liang Wang,Yanzhi Xia
The graft copolymerization of methyl methacrylate (MMA) onto alginate was carried out in aqueous media by initiators of ammonium persulphate under a nitrogen gas atmosphere. Then, the grafting of PMMA chains onto the alginate backbone was confirmed through the study of Fourier transform infrared, X-ray diffraction, scanning electron microscopy and 1 H nuclear magnetic resonance spectroscopy . At last, a thin and transparent polymethyl methacrylate grafted alginate film with high strength was obtained by the casting method. The effect of MMA/SA ratio or percentage of graft (G%) on mechanical properties, thermal stability (thermogravimetric analysis/differential thermogravimetry analyses), color, opacity and water resistance of composite films were characterized. Results showed the homogeneous transparent films could be obtained while G% was lower than 8.64%. After being grafted by PMMA, the tensile strength of the films was distinctly improved by 205.3%, as well the elongation at break (E%) by 41.7% while the MMA/SA (g/g) is 0.3. On the other hand, water resistance, thermal stability and crystallinity of the films were improved, however, the transparency was slightly decreased.
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MOLECULES
·
2018
·Vol. 23
·期 3
·546
·
IF 3.098
Lei Wang,Wanfu Zhou,Qingguo Wang,Chao Xu,Quan Tang,Haiyang Yang
Oxidized sodium alginate is a handily modifiable polysaccharide owing to the pendant aldehyde groups which can form dynamic covalent bonds with amines, acylhydrazines, etc., providing oxidized sodium alginate-based hydrogels with stimuli-responsive properties. However, due to the stiffness and, in particular, the hydrophobicity of sodium alginate dialdehyde at low pH, the mechanical performance and pH stimuli responsiveness of oxidized sodium alginate-based hydrogels are still strictly limited. Herein, we report a new strategy to build an injectable, dual responsive, and self-healing hydrogel based on oxidized sodium alginate and hydrazide-modified poly(ethyleneglycol) (PEG). The hydrazide-modified PEG, referred to as PEG-DTP, acts as a macromolecule crosslinker. We found that the presence of PEG-DTP reduces the hydrophobicity of oxidized sodium alginate at low pH so effectively that even a pH-induced reversible sol-gel transitions can be realized. Meanwhile, the disulfide bonds in PEG-DTP endows the hydrogel with the other reversible sol-gel transitions by redox stimuli. In particular, due to the softness of PEG-DTP chains, mechanical performance was also enhanced significantly. Our results indicate we can easily integrate multi-stimuli responsiveness, injectability, and self-healing behavior together into an oxidized sodium alginate-based hydrogel merely by mixing an oxidized sodium alginate solution with PEG-DTP solution in certain proportions.Keywords:oxidized sodium alginate;dynamic covalent bonds;stimuli-responsive;sol-gel transitions;injectable hydrogel;self-healing
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Frontiers of Materials Science
·
2017
·Vol. 11
·期 3
·215-222
·
IF 1.471
Wu Yu,Yuan Liu,Sheng Nai-an,Gu Zi-qi,Feng Wen-hao,Yin Hai-yue,Morsi Yosry,Mo Xiu-mei
Sodium alginate and carboxymethyl chitosan have been extensively applied in tissue engineering and other relative fields due to their low price and excellent biocompatibility. In this paper, we oxidized sodium alginate with sodium periodate to convert 1,2-hydroxyl groups into aldehyde groups to get aldehyde-sodium alginate (ASA). Carboxymethyl chitosan was modified with ethylenediamine (ED) in the presence of water-soluble N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC) to introduce additional amino groups to get amino-carboxymethyl chitosan (A-CS). Upon mixing the A-SA and A-CS aqueous solutions together, a gel rapidly formed based on the Schiff’s base reaction between aldehyde groups in A-SA and amino groups in A-CS. FTIR analysis confirmed the characteristic peak of Schiff’s base group in the hydrogel. It was confirmed that the gelation time be dependent on the aldehyde group content in A-SA and amino group content in A-CS. The fasted hydrogel formation takes place within 10 min. The data of bonding strength and cytotoxicity measurement also showed that the hydrogel had good adhesion and biocompatibility. All these results support that this gel has the potential as soft tissue adhesive.
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