ACS Applied Polymer Materials
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2022
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IF 4.855
Jinghua Liu,Xuejie Meng,Fan Dong,Suyu Ren,Bo Wang,Feng Tan
Flexible sensors require good tensile properties, flexibility, and enough sensitivity for monitoring and transmitting subtle strain changes in motion. Here, the MXene-sodium alginate-acrylamide (MSA) composite hydrogel was synthesized by polymerization of acrylamide (AM), Ti3C2Tx MXene nanosheets, and sodium alginate (SA). Scanning electron microscopy, energy dispersive spectroscopy, and elemental mapping demonstrated a uniform dispersion of Ti3C2Tx MXene nanosheets in the composite hydrogel regime. The strong hydrogen bonding interactions between Ti3C2Tx MXene nanosheets and SA–AM polymers were verified by Fourier transform infrared spectroscopy and differential scanning calorimetry analysis. The prepared M20S2.5A hydrogel had 4350% limited tensile strain and fractured energies up to 359.51 J m–2 and significant hysteresis in cyclic loading–unloading experiments, indicating its excellent energy dissipation performance. The conductivity of the M20S2.5A hydrogel had a good linear response (1300–3500%) with the stretch distance and a fast response time of 0.27 s. At the same time, MSA hydrogels have high sensitivity (GF = 2.31). These advantages allowed it to real-time monitor the random motion of the human body such as throat swallowing, finger bending, and knee flexion and extension. The present study showed great potentials of the MSA hydrogel in flexible wearable devices.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Juping Ma,Penghui Wang,Chuanfei Tang,Huiyun Liao,Wenjie Zhang,Rong Yang,Tianqi Shi,Xiaoyan Tan,Bo Chi
Endoscopic submucosal dissection (ESD) is one of the most effective approaches for the minimally invasive treatment of early gastrointestinal cancers. Submucosal injections help safely and successfully remove lesions during ESD by elevating the mucosa and separating the submucosal muscle layer. Herein, we report dynamic injectable sodium alginate hydrogels (ISAHs) with shear-thinning for ESD surgery, which were easily fabricated by the sulfhydryl group of GSH-modified sodium alginate (SA-GSH) reacting with the aldehyde group of oxidized sodium alginate (OSA) at room temperature. ISAHs have advantageous self-healing abilities and antioxidant activity. Additionally, according to an in vitro test on porcine colorectal submucosal lifting, the submucosal elevation heights created by ISAHs were 13 % -18 % greater than those created by commercial ESD solutions (0.4 w / v % sodium hyaluronate). These properties and biocompatibility were confirmed in vitro and in vivo experiments. ISAHs will hopefully become a novel submucosal injectable hydrogel to assist ESD surgery.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
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IF 8.025
Yiruo He,Ye Tian,Wenjie Zhang,Xinghai Wang,Xue Yang,Bin Li,Liming Ge,Ding Bai,Defu Li
Guided bone regeneration technique is an effective approach to repair bone defects, in which a barrier membrane is essential. However, the collagen barrier membranes commonly used lose stability quickly, leading to connective tissue invasion and failure of osteogenesis. Herein, we presented an oxidized sodium alginate (OSA)-collagen heterogeneous bilayer barrier membrane with well-controlled pore size and osteogenesis-promoting ability. The OSA crosslinking significantly improved the structural stability, compressive strength, swelling behavior, and slowed down the biodegradation rate of collagen membranes. Meanwhile, the collagen-based membranes exhibited superior cytocompatibility, osteogenesis-promotion, and barrier function against fibroblasts. Especially, the osteogenic differentiation was most promoted on the membrane with a large pore size (240–310 μm), while the barrier function was most improved on the membrane with a small pore size (30–60 μm). Then the above two membranes were combined together to obtain a heterogeneous bilayer membrane. This bilayer barrier membrane showed excellent osteogenesis-promoting ability in rats.
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International Journal of Polymeric Materials and Polymeric Biomaterials
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2022
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IF 3.221
Anduo Zhou,Yasong Hu,Chongshuai Chen,Heyi Mao,Lei Wang,Shanfeng Zhang,Xia Huang
3D printing technology has significant advantages in the processing field of vascular tissue engineering. We have developed KCMA/SA hydrogels based on methacrylated carrageenan (KCMA) and sodium alginate (SA), which have low viscosity and shear thinning properties and can be used for 3D printing. The physicochemical double cross-linked network structure leads to good mechanical properties. The composite hydrogels maintain the liquid crystallinity of KC, which causes the HUVECs to align. The KCMA/SA gel filaments printed by the 3D extrusion printing system formed a connected microstructure. These characteristics all indicate the potential of KCMA/SAs in the field of tubular tissue regeneration.
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Journal of the Mechanical Behavior of Biomedical Materials
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2022
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IF 4.042
Yexiao Guan,Yanrui Mao,Jianguo Liao
In this paper, given the lack of osteogenic activity of sodium alginate (SA) hydrogel and to simulate the composition of natural bone, ionic-crosslinking NBG/n-HA/SA hydrogel scaffolds were prepared by using nano bioactive glass (NBG) and nano hydroxyapatite (n-HA) with high bioactivity as composite calcium sources and reinforcement phases, and D-gluconic acid δ-lactone (GDL) as the coagulant. The results showed that the mixture of the precursor forming the network had good injectability and plasticity. When the dosage of GDL was 0.75 g, the gelling time of the composite hydrogel could be regulated within 4–8 min, and the hydrogel had high compressive strength (170–220 kPa), as well. When the mass ratio of calcium source to SA was 1:1, the crosslinking network was relatively uniform with a considerable number of large pores around 40 μm in the structure. In the immersion experiment in vitro, it was found that the composite hydrogel could promote the deposition of bone-like apatite on the material's surface. Meanwhile, the cell experiments in vitro verified that the NBG/n-HA/SA composite hydrogel had good cytocompatibility without cytotoxicity. Moreover, the composite hydrogel could enhance the activity of ALP of mouse bone marrow mesenchymal stem cells , and thus, it had good osteogenic activity.
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Frontiers in Nutrition
·
2022
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IF 6.59
Qiao Bian-Wen,Liu Xin-Tong,Wang Chen-Xin,Song Shuang,Ai Chun-Qing,Fu Ying-Huan
In this study, phycocyanin-sodium alginate/lysozyme complex (PC-SLC) was prepared for the first time and characterized by UV spectroscopy, Fourier transform infrared spectroscopy (FT-IR), and circular dichroism spectroscopy (CD). The stability of PC-SLC under light, temperature, pH and simulated gastrointestinal fluid was investigated. The scavenging ability of the complexes against DPPH and ABTS radicals was determined. The results showed that the complex formed by the mass ratio of SA-LZM of 0.1 showed the highest PC encapsulation rate (89.9 ± 0.374%). The combination of SA and LZM changed the secondary conformation of PC. The PC-SLC complex shows an irregular spherical structure and the spheres are clustered together. Compared with phycocyanin (PC), its thermal stability was obviously improved, but it was still greatly influenced by light. It could exist stably in simulated gastric fluid (SGF) for 2 h and be slowly digested in simulated intestinal fluid (SIF), which helped to promote the absorption of nutrients in the intestinal tract. Meanwhile, the complex PC-SLC showed high scavenging ability for DPPH and ABTS radicals. It can be concluded that the complexes have good antioxidant activity. This study provides an idea for the construction of PC delivery system and makes it more widely used in food industry and other fields.
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INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
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2022
·Vol. 57
·期 10
·6867-6880
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IF 3.612
Qiushi Tang,Jiwen Hu,Shi Li,Shudong Lin,Yuanyuan Tu,Xuefeng Gui
Summary A colorimetric pH-sensitive hydrogel indicator integrated with the smartphone for real-time and visual food spoilage monitoring was developed. Herein, the poly(vinyl alcohol)/sodium alginate (PVA/SA) hydrogel was used as the carriers for the pH-sensitive mixed-dye methyl red/bromothymol blue (MR/BB), which can be employed as an amine indicator. The functional hydrogel was prepared by a simple freezing/thawing process that mainly performed in PVA and calcium cross-linking in SA. The optimal condition for the sensitivity of hydrogel towards ammonia and the structure of the hydrogel were investigated. The potential applications of the hydrogels in beef, fish, chicken and pork were evaluated under different storage conditions. Sigmoidal fitting results indicated that the RGB model with a smartphone can form a strong correlation with the total volatile basic nitrogen (TVB-N) values in common meat products. The hydrogel indicators with sensitive and stable properties have proven to be promising materials for use in food spoilage monitoring.
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Journal of Cleaner Production
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2022
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IF 11.072
Da Liu,Wenyi Gu,Wenqi Zhou,Ying Xu,Wenjia He,Lizheng Liu,Liang Zhou,Juying Lei,Jinlong Zhang,Yongdi Liu
The activation of hydrogen peroxide (H 2 O 2 ) by Fe/carbon composites has been widely used for the removal of antibiotics. However, the secondary pollution of iron ions limits the application of Fe 2+ /H 2 O 2 system. In this work, three kinds of hydrogel materials combining metal-organic framework (MOF)-derived magnetic Fe/porous carbon (MagFePC) with sodium alginate (SA), polyacrylic acid (PAA) and agarose (AG) were prepared by different methods for removal of norfloxacin (NOR) antibiotics in simulated wastewater. After comparison, MagFePC/SA hydrogels synthesized by a titration forming method were found to have the advantages of good toughness, abundant pores and best Fenton activity. MagFePC/SA can effectively activate H 2 O 2 to remove NOR under neutral conditions, and there was almost no leaching of iron ions, causing no secondary pollution to the environment. The effects of pH, ionic strength and surfactants on the degradation performance for NOR were studied. Mechanism study revealed that ·O 2 − and 1 O 2 were the main active species for the degradation of NOR, and the materials still had good stability and reusability after repeated cycles. More important, we built a simple automated unit for wastewater treatment under laboratory conditions that can completely degrade a 5 mg/L NOR solution at a flow rate of 2 mL/min. Current works showed that MagFePC/SA had the advantages of simple synthesis, outstanding degradability , excellent stability and eco-friendly reaction, which was a wastewater treatment material with good prospect for industrial application.
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Nanomaterials
·
2022
·Vol. 12
·期 15
·2591
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IF 5.719
Si Fu,Binbin Zhang,Zhiying Miao,Zhenyang Li,Rong Tu,Song Zhang,Bao-Wen Li
Chemically exfoliated nanosheets have been extensively employed as functional nanofillers for the fabrication of polymer nanocomposites due to their remarkable electrical, magnetic and optical properties. However, achieving a good dispersion of charged nanosheets in polymer matrix, which will determine the performance of polymer nanocomposites, remains a challenge. Herein, we investigated the dispersion and aggregation behavior of negatively charged Ca2Nb3O10(CNO) perovskite nanosheets in negatively charged sodium alginate (SA) aqueous dispersion using dynamic light scattering (DLS). When CNO nanosheets meet with SA, aggregation and coagulation inevitably occurred owing to the absorption of SA on nanosheets. By controlling the electrostatic attraction between positively charged poly(ethylene imine) (PEI) and negatively charged SA, the charge density and hydrodynamic size of SA can be tuned to enable the good dispersion of CNO nanosheets in SA. This result may provide a new strategy to achieve the good dispersion of charged nanosheets in charged polymers for the rational design of multifunctional nanocomposites.Keywords:perovskite nanosheets;dispersion;charged polymer;aggregation of nanosheets;dynamic light scattering
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JOURNAL OF RARE EARTHS
·
2021
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IF 3.712
Tengfei Ma,Xinyun Zhai,Yongkang Huang,Mengzhen Zhang,Pengfei Li,Yaping Du
For wound healing, wound infection caused by bacteria is one of the important reasons that delay wound healing process. Therefore, it is very meaningful to develop a multifunctional wound dressing with antibacterial capability to accelerate wound healing. Sodium alginate (SA) and carboxymethyl chitosan (CMCS) are the most commonly used compositions in wound dressing, but their poor stability inhibits the further applications. Introducing CMCS and using cerium ions (Ce 3+ ) to crosslink CMCS and SA to form SA-CMCS hybrid spheres by electrostatic spray method, can not only improve the stability of SA hydrogels, but also endow the spheres with excellent antibacterial properties due to the characteristics of Ce 3+ . The gradual release of Ce 3+ from the SA-CMCS spheres can effectively inhibit the growth of Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ). Combining the wound healing promotion ability of SA and CMCS, this kind of wound dressing can not only avoid wound infection caused by bacteria effectively, but also accelerate wound healing, thus it is an easily prepared material with potential applications in skin defect repair.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Tianzhu Shi,Zhengfeng Xie,Zhu Zhu,Wei Shi,Yucheng Liu,Minyao Liu
In the present study, a new potential adsorbent for the separation and removal of heavy metal ions was prepared using hydrazide modification. Characterization of structural and chemical properties of the absorbent indicated the dialdehyde sodium alginate (DSA) grafted adipic acid dihydrazide (AAD) plays a crucial role. The adsorption process correlated well with Freundlich isotherm and pseudo-second-order kinetics models . Additionally, the adsorption capacities for Hg 2+ , Pb 2+ , Cd 2+ , and Cu 2+ were 7.833, 2.036, 4.766, and 3.937 mmol g −1 , respectively. The thermodynamic parameter for the sorption demonstrated the process is endothermic and spontaneous. FT-IR and XPS analysis revealed the combination of chelation interactions and ion exchange between nitrogen, oxygen atoms and heavy metal ions. Moreover, after 10 times adsorption–desorption recycles, the adsorption efficiency of the adsorbent was slightly decreased. In conclusion, the as-prepared adsorbent has great potential in practical water pollution purification .
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FUEL
·
2021
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IF 6.609
Chao Han,Shibin Nie,Zegong Liu,Song Liu,Hong Zhang,Jiayi Li,Haoran Zhang,Zihan Wang
In order to address the environmentally friendly issue of fire prevention and extinguishing materials in coal mines, A new biomass sodium alginate gel foam (SC-GF) was prepared by using sodium alginate (SA), calcium L-lactate (CL), alkyl glycoside (APG) and tea saponin (TS). The effect of different concentrations of CL on the properties of SC-GF was analyzed by studying the gelation time, foaming volume and half-life of the SC-GF. The results show that the gelation time of SC-GF is successfully controlled by using the weak electrolyte CL as the cross-linking agent. When SA: CL: APG: TS = 4 : 1 : 2 : 1, the gelation time of SC-GF is 10 min with half-life of 16 days. Furthermore, A metal coordination bond favorable to the stability of SC-GF is formed by the carboxylate ion of α-L-gulonic acid in SA and Ca 2+ ionized by CL. SC-GF exhibits excellent fire prevention and extinguishing properties. The CO concentration of the coal sample treated with SC-GF decreases from 7556.8 to 34.92 ppm in the process of oxidation at room temperature for 48 h. The temperature-programmed oxidation test shows that SC-GF can delay the accelerated oxidation temperature from 120 to 160 °C, and the CO inhibition rate is as high as 60.5 % at 200 °C. The fire extinguishing test indicates that SC-GF can significantly reduce the temperature of the coal sample and extinguish the coal fire quickly. The study is useful to develop efficient and environmentally friendly coal mine fire prevention and extinguishing materials.
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