COLLOID AND POLYMER SCIENCE
·
2022
·Vol. 301
·期 2
·135-145
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IF 2.434
Xiong Jiuming,Zhan Tianyu,Hu Yufang,Guo Zhiyong,Wang Sui
Conductive hydrogels have attracted much attention because of their adjustable mechanical properties and excellent electrical conductivity. However, the variability and conductivity of traditional conductive hydrogels will be greatly reduced in low temperature environment, which seriously affects their application range. In this study, we fabricated a dual network conductive hydrogel with frost resistance. Here, water and glycerol binary solvents are introduced into the hydrogel to give the hydrogel antifreezing properties. The double-network structure of PAA/CMCs-Ca 2+ (W-G) hydrogel can provide good tensile and energy dissipation properties. The hydrogel strain sensor has high sensitivity (strain coefficient is 3.294 in the range of 100 ~ 250%, strain coefficient is 6.986 in the range of 250 ~ 400%) and good stability. PAA/CMCs-Ca 2+ (W-G) hydrogel has a great potential application in human signal detection.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Yicong Zhao,Gongwei Li,Duoxia Xu,Tong Wu,Shaojia Wang,Yanping Cao,Wei Gao
In this study, the influence of extracted pangasius myosin on the thermal stability of lycopene and the mechanism of their interaction were examined. The addition of pangasius myosin positively affected the thermal stability of lycopene. After adding myosin, under heating conditions, the L* value of lycopene increased by 6.2–10.04%, a* value increased by 20–27%, and ΔE decreased by 42–51%. Lycopene inhibited the fluorescence of ovalbumin by static burst. Binding and thermodynamic parameters demonstrated that lycopene bound spontaneously to myosin through hydrophobic interaction with a complex stoichiometry ratio of 1:1. Circular dichroism and Fourier infrared transform spectroscopy were used to examine the secondary structure changes that occurred in myosin after it bound to lycopene. Particle size and electron microscopy analysis showed that the addition of low concentrations of lycopene resulted in smaller particle size and improve dispersion stability; however, high concentrations of lycopene promoted myosin aggregation. This study provides a theoretical foundation for improving the thermal stability of lycopene in minced fish products.
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Materials Today Communications
·
2022
·
IF 3.662
Seema Singh,Ritesh Patidar,Vimal Chandra Srivastava,Praveen Kumar,Ajay Singh,Shang-Lien Lo
In the present study, ellipsoid-shaped cupric oxide (CuO) with uniform size were synthesized by facile template-free urea-glycerol-assisted hydrothermal approach and consequent heat treatment. The CuO nanospheres possessed tunable pore features with comparatively higher value of a specific surface area (98.4 m 2 g −1 ) and an excellent number of pores size 9.8–12.3 nm. As prepared catalysts exhibited excellent peroxymonosulfate (PMS) activation ability for the treatment of highly toxic perfluorooctanoic acid (PFOA) from aqueous solution. Moreover, a systematic degradation approach was investigated by the study of various operating parameters such as PMS dose, catalyst dose, concentration of PFOA, initial pH, and temperature. Zeta potential measurement confirmed that PMS activation with ellipsoid CuO enhanced the availability of more active Lewis acid sites and show high chemical stability. About 92% PFOA degradation and 78% TOC reduction were achieved within 90 and 120 min respectively at optimum condition of initial pH= 7, catalyst dosage = 0.5 g L −1 , PMS o = 0.5 mM, and temperature= 328 K for a solution of PFOA o = 10 mgL −1 by PMS/ellipsoid CuO system. Scavengers test analysis confirmed that singlet oxygen ( 1 O 2 ) is the most active species which effectively participated in the strong oxidative-reductive mechanism of PFOA degradation. In addition, a two-step pseudo-first-order kinetic model was well fitted, and very little metal leaching was observed via reusing after six cycles. GC-MS analysis was used for identification of the intermediates, a possible stepwise degradation pathway of long-chain perfluorosulphonic acids (PFACs) to shorter chain intermediates with the role of ellipsoid-CuO in PMS activation has been proposed.
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TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Xiaojing Fu,Shuming Guo,Yong Wan,Changsheng Zheng,Qiang Li,Bingchang Liu
Superlubricity was achieved by the addition of copper nanoparticles (CuNPs) as an additive to glycerol, a sustainable lubricant, which was applied to TiN-coated steel that underwent ball-on-flat reciprocating testing at an average contact pressure of 54.6 MPa. A coefficient of friction of ∼ 0.007 and a wear rate of 2.0 × 10 –8 mm 3 /N m were achieved on the TiN coating when lubricated with glycerol + 0.1 wt% CuNPs at a sliding speed of 120 mm/s. XPS and Raman analysis suggested that a surface tribofilm containing CuNPs and a carbon-based film derived from the degradation of glycerol were deposited onto the contact area of the tribopairs, which effectively prevented the direct asperity contact between the steel ball and TiN-coated steel, enabling ultra-low friction.
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ACS Nano
·
2023
·
IF 17.1
Yue Hou,Yazhen Li,Yingqi Li,Da Li,Tailin Guo,Xu Deng,Hongping Zhang,Chaoming Xie,Xiong Lu
Hydrogels with robust wet adhesion are desirable for applications in aqueous environments. Wet adhesion arising from synergy between hydrophobic and catechol components in mussel foot proteins has been highlighted. However, optimizing hydrogels with multiple components is challenging because of their complex structure–property relationships. Herein, high-throughput screening of a series of hydrophobic alkyl monomers and adhesive catechol derivatives was used to systematically develop wet adhesive hydrogels. Short alkyl chains promote wet adhesion by repelling water at the adhesive interface, whereas long alkyl chains form strong hydrophobic interactions inside the hydrogel network that impede or dissipate energy for wet adhesion. The optimized wet adhesive hydrogel, containing short alkyl chain, was applied for rapid hemostasis and wound healing because of the synergistic effect of catechol and alkyl groups and its immunomodulation ability, which is revealed through a transcriptomic analysis. Conductive nanocomponents were incorporated into the optimized hydrogel to produce a wearable device, which was used for continuous monitoring human electrocardiogram (ECG) during swimming, and in situ epicardial ECG on a porcine living and beating heart. This study demonstrated an efficient and generalized molecular design strategy for multifunctional wet adhesive hydrogels.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiguang Huang,Haiping Chen,Jihao Yang,Tian Zhou,Heng Zhang
Recycling fly ash for ceramic membrane fabrication not only reduces solid waste discharge, but also decreases the membrane cost. Now, fly ash is becoming a promising substitute material for ceramic membrane preparation. A significant difference between fly ashes from different plants is the particle size, which makes performances of fly ash membranes unpredictable. The novelty of this work is to clarify the effects of the particle size of fly ash on ceramic membranes, thereby giving practical suggestions on fly ash selection for ceramic membrane preparation. Ceramic membranes were fabricated with different sizes of fly ashes. Effects of particle size on porosity, pore size, microstructure, mechanical strength and gas permeability of the membrane were investigated. Results indicate that a broader particle size distribution of fly ash leads to a denser structure of membrane with a lower porosity. Pore size and gas permeability of membrane increase while bending strength decreases with the particle size increasing. Bending strength of a fly ash membrane is largely determined by large particles in the fly ash because the large particles lead to cracks in the membrane. This work provides experimental bases for developing high performance ceramic membranes from fly ash.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Congnan Cen,Feifei Wang,Yifan Wang,Huan Li,Linglin Fu,Yan Li,Jian Chen,Yanbo Wang
For food packaging, a novel composite film was prepared by solution casting method using hydroxyethyl cellulose (HEC), carboxymethyl chitosan (CMCS), and zinc oxide nanoparticles as raw materials. The composite film successfully compounded the nanoparticles, as deduced by spectroscopy, crystallography and morphology observation. The addition of CMCS and ZnO enhanced the solvent resistance (the water solubility of the composite film was reduced by 94.3 %) and UV shielding ability (the UV shielding capacity of the composite film was increased by 45.73 %) of the composite film, thus improving the application prospects of the composite film in water-rich foods. In addition, the synergistic effect of CMCS and ZnO helped the composite film to efficiently inhibit the pathogenic bacteria Listeria monocytogenes and Pseudomonas aeruginosa (rate of inhibition>99.99 %) in food. The addition of CMCS and ZnO also significantly improved the elasticity (improve 494.34 %) and maximum load capacity (improve 142.24 %) of the composite film.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Yanqing Cong,Lingjie Ye,Shiyi Zhang,Qiuyu Zheng,Yi Zhang,Shi-Wen Lv
Constructing hollow structure is an effective strategy to boost the activity of heterogeneous catalysts in peroxymonosulfate (PMS) activation. Herein, a newly-designed Ni-CoO yolk-shell hollow sphere was first synthesized by a step-by-step method. Interestingly, the etching treatment of NH 3 ·H 2 O endowed Ni-CoO sphere with hollow yolk-shelled structure, which was beneficial for the increase of specific surface area and the full exposure of active sites. The calcination treatment reduced the charge transfer resistance and enhanced the redox ability of Ni-CoO, further improving its catalytic activity . As expected, 93.1% of diclofenac sodium (DCF) could be rapidly degraded within 5 min over developed Ni-CoO-3/PMS system, and removal efficiency of TOC was as high as 73.3%. Significantly, redox couples of Co 3+ /Co 2+ and Ni 3+ /Ni 2+ were responsible for PMS activation based on radical pathways (namely SO 4 •− , OH • and O 2 •− ). As the typical radical pathway, 1 O 2 was also involved in DCF degradation. More importantly, Ni-CoO-3-PMS* complexes mediated the direct electron transfer between DCF and PMS. Furthermore, Ni-CoO-3/PMS system with great stability had excellent practical application prospect in actual wastewater treatment . In short, current work not only offered a high-efficiency catalyst for PMS activation, but also shared some insights into the research on advanced oxidation processes .
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Pharmaceutics
·
2022
·Vol. 14
·期 12
·2844
·
IF 6.525
Shuzhen Li,Wanqiong Li,Xin Yang,Yanfeng Gao,Guanyu Chen
Oral delivery is the most convenient drug administration route. However, oral delivery of peptides is extremely challenging due to the physical and chemical barriers within the gastrointestinal tract. Polysaccharides are often utilized as polymeric biomaterials in drug delivery. Among these, dietary polysaccharides extracted from okra, yam, and spirulina have been reported to stimulate innate immunity with well-known nutritional benefits. In this study, we developed a dietary-polysaccharide-modified fish-oil-based emulsion for oral co-delivery of a hydrophilic PD-L1 blocking peptide and the hydrophobic small molecule simvastatin. The optimal emulsion was nano-sized and exhibited a negative surface charge, high drug encapsulation efficiency of over 97%, low viscosity, and sustained drug release manner. The formulation could significantly increase the uptake of peptides by intestinal Caco-2 cells, which demonstrated the great potential of the formulation for promoting the oral absorption of peptides. Additionally, these dietary polysaccharides could promote dendritic cell maturation and cytokine expression in macrophages, demonstrating that these nutraceutical polysaccharides had dual roles of functioning as promising colloidal delivery systems and as potential immune modulators or adjuvants. Thus, this food-based colloidal delivery system shows promise for the oral delivery of peptide drugs and lays a great platform for future applications in immunotherapy.Keywords:dietary polysaccharide;water-in-oil-in-water emulsion;colloidal delivery system;immune modulator;PD-L1 blocking peptide;oral drug delivery
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhenming Yang,Shuangshuang Fan,Wei Ma,Zhiguang Li,Xuehong Ren
Complex bacterial infection and inevitable movement are the two most concerning issues in joint wound healing. In this work, N -halamine structure was introduced into polydopamine nanoparticles (PDNPs) and encapsulated in a gelatin methacryloyl (GelMA)/silk fibroin (SF) matrix to endow the patches with efficient and broad-spectrum antibacterial activity. Zone of inhibition and in vivo antibacterial tests confirm that the addition of N -halamine containing organic nanoparticles as antibacterial components is a convenient and feasible strategy in the development of wound healing antibacterial materials. Here, dopamine methacrylamide (DMA) was synthesized and grafted onto the gelatin methacryloyl in patches with UV irradiation to get a reasonable adhesion. The liver prick injury model showed that the flexible adhesive GelMA/SF-based patch could be fixed on the wound area with rapid hemostatic effect. Furthermore, the resultant patches possess good flexibility, breathability and excellent biocompatibility. The histology analysis indicated the designed patches demonstrated less inflammatory response, significantly enhanced vascularization and the regeneration of dermis and epidermis. In summary, these N -halamine hemostatic GelMA/SF patches hold a promise for diverse practical acute trauma treatments.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 9
·4228-4238
·
IF 3.3
Ying Chen,Feng Wei,Wei Mu,Xiaojun Han
The food safety issues caused by microorganisms are a great threat to human life and society. However, most edible packaging films are insufficient to meet antimicrobial applications. Thus, recent research has been focused on the combination of various antimicrobial agents with edible films. Herein, antioxidant and antibacterial starch-based edible films with different concentrations of eugenol/gelatin microspheres were developed. Gelatin microspheres were introduced as the carriers for eugenol to improve its compatibility in the composite films. The optimum composite films presented a compact and uniform structure with low water vapor permeability and low solubility. The tensile strength of the composite film reached 31.87 MPa with 2.14% elongation at break. The eugenol conferred edible films with effective antioxidant and antibacterial activities against E. coli and S. aureus. The apple cubes wrapped by the prepared films can be stored at room temperature at 50% humidity for 7 days. The fabricated composite films show promising practical applications in food packaging.
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ADVANCED MATERIALS
·
2023
·Vol. 35
·期 15
·2210624
·
IF 29.4
Yongchuan Wu,Ya Zhang,Haidi Wu,Jing Wen,Shu Zhang,Wenqian Xing,Hechuan Zhang,Huaiguo Xue,Jiefeng Gao,Yiuwing Mai
Hydrogels are widely used in tissue engineering, soft robots, wearable electronics, etc. However, it remains a great challenge to develop hydrogels possessing simultaneously high strength, large stretchability, great fracture energy, and good fatigue threshold to suit different applications. Herein, a novel solvent-exchange-assisted wet-annealing strategy is proposed to prepare high performance poly(vinyl alcohol) hydrogels by extensively tuning the macromolecular chain movement and optimizing the polymer network. The reinforcing and toughening mechanisms are found to be “macromolecule crystallization and entanglement”. These hydrogels have large tensile strengths up to 11.19 ± 0.27 MPa and extremely high fracture strains of 1879 ± 10%. In addition, the fracture energy and fatigue threshold can reach as high as 25.39 ± 6.64 kJ m −2 and ≈1233 J m −2 , respectively. These superb mechanical properties compare favorably to those of other tough hydrogels, organogels, and even natural tendons and synthetic rubbers. This work provides a new and effective method to fabricate superstrong, tough, stretchable, and anti-fatigue hydrogels with potential applications in artificial tendons and ligaments.
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