CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Chenxi Niu,Zhibo Lin,Qian Fu,Yutao Xu,Youhui Chen,Lingbin Lu
In this paper, an eco-friendly versatile superabsorbent material was designed for soil improvement, and a synchronous chemical loading strategy was proposed. In this strategy, urea not only acted as fertilizer but also acted as a crosslinker to construct an alginate network. The microstructure, chemical structure, thermal stability and composition of the obtained SA/urea hydrogel were characterized in detail. Adsorption behavior and application performance in agriculture were evaluated. The results demonstrated that urea had two different conformations in the network. The SA/urea hydrogel had abundant pore structures with excellent water absorption performance. It could not only improve the water retention capacity of soil but also release nitrogen, phosphorus and potassium elements with degradation for as long as 9 weeks. Moreover, the hydrogel could promote plant growth, increase the nutritional composition of plants and inhibit the accumulation of harmful nitrate in plants. With advantages, including biodegradability , high water absorption, controllable degradation, excellent water retention, sustained NPK release and improved plant nutrition value, the SA/urea hydrogel has great potential for soil improvement in agriculture as an eco-friendly versatile water retention agent and can be expected to extend to more fields as a novel superabsorbent material.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
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IF 6.056
Hui Wang,Jinming Liu,Xu Fan,Jing Ren,Qian Liu,Baohua Kong
In this study, natural crab-shell particles (CSP) and deacetylated crab-shell particles (dCSP) were used as crosslinking agents at the present of glucolactone to obtain high strength mono-crosslinked and bi-crosslinked sodium alginate (NaAlg) hydrogel films, respectively. The results indicated that the CSP in the system could occur Ca 2+ crosslinking, and the addition of dCSP could help to form both Ca 2+ crosslinking and polyelectrolytes interactions with NaAlg. The remaining unreacted CaCO 3 could enhance the thermal stability of the films due to the high thermally stable CaCO 3 . The surface hydrophobicity, gel properties, mechanical strength and thermal stabilities of those bi-crosslinked NaAlg hydrogel films were better than those of neat NaAlg film and mono-crosslinked NaAlg hydrogel films, which overcome the inferior thermo-mechanical properties for traditional hydrogel films. In addition, the releasing time of those prepared hydrogel films for diclofenac sodium was higher than 36 h, which illustrated sustained drug releasing activity. The CSP modified NaAlg hydrogel film with 0.5% GDL content exhibited the highest cumulative release amount. The proposed approach is a promising green crosslinking technique to develop high performance NaAlg hydrogel films that can realize active ingredients and drugs sustained release in food packaging and medical wound dressing areas.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Cheng-Zhang Qi,Xinyu Wu,Ji Liu,Xin-Jie Luo,Hao-Bin Zhang,Zhong-Zhen Yu
Although MXene sheets possess high electrical conductivity and rich surface chemistry and are well suitable for fabricating electrically conductive nanocomposites for electromagnetic interference (EMI) shielding applications, it remains challenging for MXene nanocomposites to achieve tunable EMI shielding performances and customized geometries. Herein, an aqueous MXene/sodium alginate ink is developed to print aerogel meshes with customized geometries using a direct ink writing approach. An ion-enhanced strategy is proposed to reinforce the printed aerogel meshes by multi-level cross-linking. The resultant 3D printed aerogel mesh exhibits an ultrahigh electrical conductivity of 2.85 × 10 3 S m −1 , outstanding mechanical properties , and excellent structural stability in wet environment. More importantly, a wide range of tunable EMI shielding efficiencies from 45 to 100 dB is achieved by the structural design of the 3D printed ion-enhanced MXene/sodium alginate aerogel meshes. As a Joule heater, in addition, the printed aerogel meshes can achieve a wide temperature range of 40–135 °C at low driving voltages. This work demonstrates a direct ink writing approach for the fabrication of ion-enhanced MXene/sodium alginate aerogel meshes with tunable EMI shielding properties and multi-functionalities for applications in many scenarios.
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JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Zhi-Peng Hu,Hong-Liu Jiang,Qing-Di Hu,Fu-An He,Hong-Li Zou,Zhu-Rui Zhong,Qiao-Jian Zhu,Hu-Wei Lv,Yong-Yu Yang
The hexachlorocyclotriphosphazene crosslinked sodium alginate polymer (HCSAP)/multi-walled carbon nanotubes (MWCNTs) composite was synthesized by a facile one-pot reaction for the purpose of removing the cationic dyes. The structure of the resultant HCSAP/MWCNTs composite was investigated by the scanning electron microscope, the thermal gravimetric analyzer, the Fourier transform infrared spectroscope, the X-ray photoelectron spectroscopy, and the zeta potential measurement. Furthermore, the dye adsorption behaviors of the HCSAP/MWCNTs composite were explored using the methylene blue (MB) and the crystal violet (CV) as the cationic dye pollutant models. The maximum adsorption capacities of MWCNTs-COOH/PCSAP composite for the MB and the CV reached as high as 662.3 mg/g and 666.7 mg/g, respectively. This good absorption ability could be mainly ascribed to the electrostatic attraction. The effects of the MWCNTs content, the initial dye concentration, and the initial pH value of the dye solution on the dye adsorption capacity, the adsorption kinetic, the adsorption isotherm, the adsorption thermodynamic, and the adsorption-desorption cycle regeneration were also studied for the MWCNTs-COOH/PCSAP composite in this work.
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BIOMACROMOLECULES
·
2022
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IF 6.978
Qinglong Cao,Zhen Shu,Taoyi Zhang,Wenxi Ji,Jing Chen,Yun Wei
As a classic flexible material, hydrogels show great potential in wearable electronic devices. The application of strain sensors prepared using them in human health monitoring and humanoid robotics is developing rapidly. However, it is still a challenge to fabricate a high-toughness, large-tensile-deformation, strain-sensitive. and human-skin-fit hydrogel with the integration of excellent mechanical properties and high electrical conductivity. In this study, a flexible sensor using a highly strain-sensitive skin-like hydrogel with acrylamide and sodium alginate was designed using liquid metallic gallium as a “reactive” conductive filler. The sensor had a low elastic modulus (30 kPa) similar to that of skin, a high-toughness (2.25 MJ m–3), self-stiffness, a large tensile deformation (1400%), recoverability, and excellent fatigue resistance. Moreover, the addition of gallium might enhance the electrical conductivity (1.9 S m–1) of the hydrogel while maintaining high transparency, and the flexible sensor device constructed from it showed high sensitivity to strain (gauge factor = 4.08) and pressure (gauge factor = 0.455 kPa–1). As a result, the hydrogel sensor could monitor various human motions, including large-scale joint bending and tiny facial expression, breathing, voice recognition, and handwriting. Furthermore, it might even be used for human–computer communication.
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JOURNAL OF BIOMATERIALS APPLICATIONS
·
2021
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IF 2.646
Haosheng He,Haohao Ren,Zhengwen Ding,Mizhi Ji,Hong Chen,Yonggang Yan
In this work, novel magnesium calcium phosphate/sodium alginate composite cements were successfully fabricated with a proper setting time (5–24 min) and high compressive strength (91.1 MPa). The physicochemical and biological properties of the cement in vitro were fully characterized. The composite cements could gradually degrade in PBS as the soaking time increase, and the weight loss reached 20.74% by the end of 56th day. The cements could induce the deposition of Ca–P layer in SBF. Cell experiments proved that the extracts of the composite cements can effectively promote the proliferation and differentiation of the mouse bone marrow mesenchymal stem cells (MSCs). These preliminary results indicate that the magnesium calcium phosphate/sodium alginate composite cements could be promising as potential bone repair candidate materials.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
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IF 3.8
Yongqiang Wang,Enfa Fu,Summaira Saghir,Zhenggang Xiao
The low water absorbency, poor thermal stability, and high cost of absorbent polymers remain significant challenges that need addressing to broaden their range of applications. To address these drawbacks of superabsorbents, a novel superabsorbent polymer composite (SAPc) SA-g-P(AA-co-AM)/MDE was developed using a simple aqueous polymerization method involving sodium alginate (SA), modified diatomite (MDE), acrylic acid (AA), and acrylamide (AM). The synthesized materials were systematically characterized using various techniques, including FT-IR, SEM, and XRD, to determine their chemical structure, morphology, and crystal structure. The water absorbency capacity (WAC) of SA-g-P(AA-co-AM)/MDE increased with increasing SA dosage, but it gradually declined once it exceeded 5 wt.%. The SAPc with the highest water absorbency was obtained when the SA content was 5 wt.% in both distilled water and NaCl solution. The absorption data of SA-g-P(AA-co-AM)/MDE fit well with the pseudo-first-order (PFO) kinetic model. The results of water retention capacity (WRC) demonstrated that the water-retaining time of the SAPc increased by 39.0 % compared to P(AA-co-AM). Additionally, thermal gravimetric analysis revealed that the introduction of MDE and SA enhanced the SAPc's thermal stability. Therefore, this study demonstrates that the introduction of SA and MDE can lead to SAPc with outstanding WAC, WRC, and thermal stability. These findings suggest that the SAPc prepared in this study could be a promising material for use in agriculture, industry, and sanitary goods.
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Polymers
·
2023
·Vol. 15
·期 21
·4308
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IF 5
Kai Jiang,Jiang Li,Margaret Brennan,Charles Brennan,Haiyan Chen,Yuyue Qin,Mingwei Yuan
The aim of this study was to prepare a novel pH-sensitive smart film based on the addition of purple garlic peel extract (PGE) and TiO2nanoparticles in a sodium alginate (SA)/polyvinyl alcohol (PVA) matrix to monitor the freshness of beef. FT-IR spectroscopy revealed the formation of stronger interaction forces between PVA/SA, PGE, and TiO2nanoparticles, which showed good compatibility. In addition, the addition of PGE improved the tensile strength and elongation at break of the composite film, especially in different pH environments, and the color response was obvious. The addition of 1% TiO2nanoparticles significantly improved the mechanical properties of the film, as well as the light barrier properties of the film. PGE could effectively be uniformly dispersed into the composite film, but it also had a certain slow-release effect on the release of PGE. PGE had high sensitivity under different pH conditions with rich color changes, and the color showed a clear color change from red to yellow-green when the pH increased from 1 to 14. The same change was observed when it was added to the film. In particular, by applying this film to the process of beef preservation, we judged the freshness of beef by monitoring the changes in the TVB-N value and pH value during the storage process of beef and found that the film showed obvious color changes during the storage process of beef, from blue (indicating freshness) to red (indicating non-freshness), and finally to yellow-green (indicating deterioration), which indicated that the color change of the film and the freshness of the beef maintained a highly consistent.Keywords:smart packaging;anthocyanins;color response;beef freshness;indicator film
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Yu Zhao,Jiachen Kang,Wenzhe Huang,Peng Kong,Di An,Gufeng He
Copper nanowire (CuNW), with combined advantages of high conductivity and cost-effectiveness, is considered a promising material for the development of next-generation transparent conductive films (TCFs) in the field of flexible optoelectronics. However, the practical application of CuNW TCFs is hindered by some limitations, such as conductivity degradation and poor adhesion. Here, we demonstrate a stable CuNW composite film by embedding CuNWs into a polydopamine (PDA)-modified sodium alginate (NaAlg) matrix without sacrificing the optoelectronic properties of the CuNW network. The introduction of the PDA modifier significantly enhances the antiaging capability of the NaAlg layer, providing strengthened protection of the embedded CuNWs against moisture and oxygen, thereby resulting in minimal degradation of the conductivity of CuNWs for up to 9 months under ambient conditions. Simultaneously, the interface adhesion between the CuNW network and the substrate is further enhanced due to the abundance of catechol structures in PDA, allowing for the maintenance of the electrical conductivity of the CuNW network even under cyclic external bending stress and tape-peeling forces. In addition, embedding CuNWs into the polymer binding layer produces a CuNW composite film with a very smooth surface. A flexible OLED based on the PDA-modified NaAlg/CuNW TCF is successfully fabricated, exhibiting performance comparable to that of a traditional rigid indium tin oxide-based device, while also demonstrating remarkable mechanical durability. The modification strategy can promote practical applications of the CuNW network in flexible optoelectronic devices.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Zhikun Yang,Mingrui Li,Yanxiao Li,Xiaowei Huang,Zhihua Li,Xiaodong Zhai,Jiyong Shi,Xiaobo Zou,Jianbo Xiao,Yue Sun,Megan Povey,Yunyun Gong,Melvin Holmes
The poor biological, mechanical and water-resistance properties of sodium alginate/guar gum film (SG) limit its application in food preservation. To overcome this disadvantage, we added β-Cyclodextrin/persimmon pectin-stabilized baobab seed oil Pickering emulsion (BOPE) to enhance the mechanical and water resistance properties of SG film, and added green synthesized silver nanoparticles (AgNPS) and Lycium ruthenicum extract (LA) to improve the biological properties of the film. The properties of BOPE was optimized using Box–Behnken design (BBD). Scanning electron microscope and Fourier transform infrared results revealed the change of structure and molecular interaction in the SG film after the addition of AgNPS, LA, and optimized BOPE. The 2.0%BOPE-loaded film containing AgNPS/LA with the enhanced mechanical, barrier, BO retention, and biological properties not only improved the preservation effect on mushroom ( A. bisporus ), but also maintained structural stability. Thus, the 2.0%BOPE-loaded SG/LA/AgNPS film has considerable potential in active packaging applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Chen Chen,Enhui He,Weina Jia,Shuwei Xia,Liangmin Yu
The rapid development of the printing and dyeing industry has led to the production of a large amount of high-density printing and dyeing wastewater, and technology for its effective treatment has become a focus of research. To construct a polymeric adsorbent material with abundant functional groups for the efficient adsorption of dye wastewater, a novel magnetic sodium alginate/carboxymethylcellulose interpenetrating network gel sphere (Fe 3 O 4 @SA/CMC-Fe) was prepared by co-blending sodium alginate (SA) and sodium carboxymethylcellulose (CMC) with Fe 3 O 4 ; Fe 3 O 4 @SA/CMC-Fe was characterized by SEM–EDS, XRD, TGA , FT-IR, UV–Vis, VSM, BET-BJH and XPS . Static adsorption experiments showed that the optimal rates for adsorption of DV 51 and DR 23 from solutions with neutral pH values by Fe 3 O 4 @SA/CMC-Fe were up to 96 %, the adsorption process exhibited a Langmuir adsorption isotherm, and the dynamic adsorption process was accurately described by the pseudo-second-order kinetic model. A thermodynamic study showed that the adsorption reactions were all spontaneous exothermic reactions with increasing entropy. The mechanism for adsorption of the dyes by Fe 3 O 4 @SA/CMC-Fe involved hydrogen bonding, complexation and electrostatic adsorption. In summary, Fe 3 O 4 @SA/CMC-Fe is a green, simple, recyclable and highly efficient magnetic adsorbent that is expected to be widely used in treating dye wastewaters over a wide pH range.
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CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Wei Huang,Lihua Zhao,Jiayan Zhang,Hao Wen,Ziyi Zhu,Ping Wang,Yizhen Liu,Changkun Liu
In the current research, preparation of a forward osmosis membrane that can effectively reject heavy metals in wastewater treatment would prove to be highly beneficial. Here, an innovative forward osmosis (FO) membrane with a “sandwich” structure (formed via the template method) was achieved for the first time through the fabrication of a porous hydrogel sublayer. A porous hydrogel matrix with excellent water retention capacity was formed through the crosslinking reaction of sodium alginate and calcium chloride in the presence of zinc oxide (ZnO) nanoparticles, followed by etching to remove the ZnO nanoparticles in the sublayer to produce the porous structure. The water flux of the modified membrane was quintuple compared with the that of the original membrane, with no reduction on the salt rejection performance. The surface polyamide layer and sublayer acted as double barriers and achieved a rejection rate of over 98% for heavy metal ions (Cd 2+ , Cu 2+ , Pb 2+ , Ni 2+ ), when the glucose solution was used as the draw solution. The inclusion of the porous sublayer can provide deeper insights into the fabrication of high-performance FO membranes, and expand their applications.
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