LANGMUIR
·
2026
·
IF 4.4
Zhengqiu Chen,Junyu Chen,Huaming Mao,Jungang Yin,Yu Ren,Wei Dai,Shuanglong Zhao,Hongwei Yang
Although the preparation of silver nanosheets (AgNSs) through diverse methods has largely advanced over the past few decades, the simple and efficient synthesis of high-quality AgNSs under mild conditions remains challenging. Herein, we report a strategy for preparing rounded and sharp-cornered AgNSs with uniform thicknesses of 30–40 nm via simple liquid-phase reduction. Structural characterization revealed that the reduction reaction rate was mediated by coordination of silver ions with the amino groups of gelatins and the carboxylate ions of glutaric acid (GA), effectively suppressing burst nucleation. Density functional theory calculations further identified the adsorption preference of GA anions on Ag(111) as the key factor that dictates the anisotropic growth of silver nanosheets. Furthermore, selective etching with hydrogen peroxide (H2O2) mediates the morphological evolution of AgNSs from rounded to sharp-cornered morphologies, effectively removing byproduct particles to achieve sharp-cornered AgNSs in yields exceeding 90%. Catalytic performance testing of the hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) indicates that the mass-normalized rate constants reached 156.67 and 154.22 s–1 g–1 for the rounded and sharp-cornered AgNSs, respectively. The conversion rate of 4-NP decreased by only about 2% after five consecutive catalytic cycles. This work provides guidelines for the efficient, economical, and green synthesis of two-dimensional metal nanomaterials while offering valuable insights into the application of the AgNSs in the catalytic reduction of 4-nitrophenol.
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Advanced Composites and Hybrid Materials
·
2026
·
IF 15.5
Liu Yi,Fu Yuanmao,Zhang Xian,Guo Xiaoyu,Wang Xiaolin,Guo Hui
Smart adhesives with on-demand control are highly desirable, while creating hydrogels that combine strong, switchable underwater adhesion remains a significant challenge. Herein, we develop a novel strategy to achieve robust and tunable underwater adhesion with bio-inspired smart glass-like hydrogels. As a proof of concept, a hydrogel is simply prepared by integrating rigid poly(phenyl acrylate) segments into a poly[2-(acryloyloxy)ethyl]trimethylammonium chloride network. At room temperature, the vitrified phase-separated structure imparts the hydrogel with high mechanical strength. The adhesion is governed by a reversible transition between a soft network state and a frozen one, where the elastic modulus varies by 600-fold. The soft state conditions conformal underwater contact, allowing non-covalent interactions and mechanical interlocking to develop, while the network re-enters the frozen state, restoring cohesion and locking the established interfacial contact, thereby enabling high underwater adhesive strength on various substrates (up to 1.45 MPa), which outperforms most reported hydrogel adhesives. Notably, the adhesive performance can be reversibly switched off by returning the network to the soft state for facile detachment, allowing the material to function as a thermo-controllable gripper. Systematic evaluations validate the proposed adhesion mechanism, revealing that adhesive performance is strongly dependent on the hydrogel’s stiffness, contact condition, testing temperature, and substrate roughness. This work offers a promising strategy for designing next-generation smart adhesives with tunable and reversible performance for broad practical applications.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Zhengqiu Chen,Junyu Chen,Huaming Mao,Jungang Yin,Yu Ren,Wei Dai,Shuanglong Zhao,Hongwei Yang
Nitrophenols and nitroanilines represent a series of organic pollutants that pose a significant environmental threat. Nevertheless, their catalytic reduction products — aminophenols and phenylenediamine — are regarded as valuable industrial intermediates. Therefore, identifying a highly active and cost-effective catalyst is essential for achieving the efficient catalytic conversion of nitrophenol and nitroaniline. Here, we employed a liquid-phase reduction approach to synthesize silver catalysts with varied morphologies and abundant defects (stacking faults and microporosity) through a rapid self-assembly process induced by gelatin. We found that the conformation of small polypeptide chains in gelatin can be regulated via controlled temperature gradients during synthesis, thereby directing the self-assembly of silver nanostructures into 2D nanosheets and 3D spherical nanoflowers. Spherical aberration transmission electron microscopy revealed the presence of abundant stacking faults on the surface of the silver catalyst. Therefore, the silver catalysts exhibited excellent catalytic activity for the catalytic reduction of 4-nitrophenol (4-NP), 2-nitrophenol (2-NP), and p-nitroaniline (p-NA), with reaction rate constants of 1.20 × 10 −2 s −1 , 1.04 × 10 −2 s −1 , and 1.23 × 10 −2 s −1 , respectively. Furthermore, a detection limit of 50 nM for 4-NP was achieved using AgNSs-modified glassy carbon electrodes.
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FOOD CHEMISTRY
·
2026
·
IF 9.8
Yue Lv,Wenqiang Jia,Hongda Cai,Leiying Ma,Yating Zhang,Mingdi Chen,Chaofan Sun,Xiuhua Zhao
Bacterial cellulose (BC) is a natural polysaccharide polymer synthesized by microorganisms via fermentation. However, its complex three-dimensional network structure results in poor solubility, and traditional solvents, being toxic and energy intensive, limit its industrial application. In this study, 792 ionic liquids (ILs) were screened by Conductor-like screening model for realistic solvents (COSMO-RS) to predict BC solubility. Experimental validation revealed that 1,5-diazabicyclo[4.3.0]non-5-ene carboxylates ([DBN][AC]) achieved efficient dissolution of BC (DP = 9217) at a concentration of 6%. Combined with theoretical calculation and analysis, the molecular mechanism by which ILs disrupt the hydrogen bond network of BC was revealed. Regeneration experiments confirmed that the recovery rate of [DBN][AC] was as high as 93.8%. This study not only verified the reliability of the COSMO-RS model in guiding green solvent design, but also provides potential for the modified BC in future applications in the fields of active food packaging and as bioactive carriers.
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POLYMER DEGRADATION AND STABILITY
·
2026
·
IF 8.1
Jianshuang Zhang,Anyang Tang,Shufen Zhang,Wenbin Niu
Converting waste polyethylene into valuable monomer compounds represents an ideal strategy to mitigate the accumulation of plastic waste. However, the chemical stability of the C–C backbone poses a formidable challenge for chain scission—state-of-the-art technologies are confined to specific polymers and lack practical utility. In this work, we used low-concentration nitric acid as an oxidant to convert low-density polyethylene (LDPE) waste into high-value-added dicarboxylic acids using a one-step hydrothermal method and used it for novel polyester synthesis. The degradation mechanism under nitric acid oxidation was systematically investigated by multiple characterization techniques. Under the conditions of 160°C and 0.20 g/mL nitric acid concentration with a 5 h, dicarboxylic acid was obtained with a high yield of 93% and a carbon yield of 37%. The resulting product was subsequently subjected to ring-opening polymerization with epoxy resin monomers, including the structurally rigid bisphenol A diglycidyl ether (DGEBA) and the flexible aliphatic polyethylene glycol diglycidyl ether (DGEG), yielding a novel degradable polymer with tailorable rigidity-flexibility properties. Systematic variation of the DGEBA:DGEG molar ratio from 1:1 to 9:1 produced corresponding changes in mechanical properties, with tensile strength increasing from 1.37 MPa to 24.69 MPa and elongation at break decreasing from 864.90% to 28.48%. This study breaks the exclusive dependence of polyester synthesis on petrochemical-based monomers. By partially replacing petrochemical monomers with those derived from waste polyethylene, it realizes the leap of waste polyolefin resources from low-level recycling to high-value feedstock utilization.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Caixia Zhao,Tian Fu,Xinyu Wu,Huici Han,Yan Lv,Guoxiang Zou
Dynamic covalent polymer networks represent new opportunities in the design of sustainable epoxy resins due to their excellent reprocessability. However, these vitrimers typically exhibit mechanical brittleness and poor resilience performance, limiting their applications in sealing, vibration damping, and impact resistance. E44/poly(2-methyl-1,3-propanediol adipate)/glutaric acid (E44/PMPA/GA) epoxy elastomers, with high resilience, reprocessability, and chemical degradability, were synthesized through epoxy-carboxylic acid opening-ring reactions. The E44/PMPA 2 /GA 8 vitrimers exhibited the highest cross-linking density (226.3 mol/m 3 ), a T g of 22.8°C (from DMA), and high thermal stability ( T i : 337°C). Owing to flexible chains and a moderate cross-linking density, the E44/PMPA 10 exhibited superior resilience (residual strain 5.6% after five tensile cycles). Meanwhile, the dynamic ester bonds within the networks endowed the E44/PMPA/GA with self-healing ability and recyclability. In addition, the vitrimers were completely chemically degradable. By regulating the synergistic effects of flexible chain segments and dynamic bonds, this work provided a promising and feasible route for the preparation of epoxy elastomers that integrate high resilience, reprocessability, and chemical degradability.
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JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
·
2023
·
IF 5.3
Xingjian Sun,Ping Rao,Xitao He,Canhui Yang,Wei Hong
Do materials prepared from identical compositions of constituting ingredients always exhibit similar mechanical properties? The answer is negative for most structural materials, as has been demonstrated by extensive studies on various factors such as the effects of processing and microstructures. However, the same question has seldom been addressed in the case of polymeric gels. In this work, by using a simple chemically crosslinked hydrogel as a model system, the mechanical properties, including elastic stiffness , fracture toughness , and fatigue threshold, of gels with identical chemical compositions are systematically investigated. The distinct material properties are then rationalized and quantitatively correlated to synthesis conditions and manufacture processes through scaling laws derived from basic physics. Different scaling laws are identified between samples prepared from swelling and deswelling. Extreme mechanical properties, such as the remarkable fracture energy of hydrogels prepared by deswelling from highly swollen samples, are observed and attributed to the structural characteristics of the polymer network , and further correlated to the synthesis processes. This study provides insights into the synthesis-property correlations of polymeric gels, which may have profound influences on the design of new polymeric materials and their applications in various fields.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Chang Cong,Jixiao Wang,Zhan Wang,Guangyu Xing,Zhi Wang
Epoxy vitrimers with thermal-healing ability are widely studied to prolong the service life of materials. But the conventional preparation and healing strategy, involving external catalysts, preheating, hot press or/and heating the entire coating, are not applicable for the large-scale applications. In this work, a room-temperature brushable oxidized carbon black (OCB)/epoxy vitrimer composite based on dynamic transesterification reaction with excellent protective performance and localized photothermal-healing was prepared by solvent method. No external catalysts, preheating and hot press was needed in the preparation process. The experimental results demonstrate that the composite coatings exhibited an excellent metal protective performance. The effective non-contact local photothermal-healing can be achieved in 20 Min., and the scratch width can apparently narrow over 95 % and the impedance moduli of the composite coatings can be recovered from 263 Ω·cm 2 to above 10 8 Ω·cm 2 . The OCB/epoxy vitrimer composite coating, combining ideal metal protective performance with non-contact local photothermal-healing performance, has great promise for many practical applications in large-scale, such as metal protection and solar-energy collector.
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Biomaterials Science
·
2023
·Vol. 11
·期 9
·3321-3334
·
IF 6.6
Yifei Zheng,Chao Qin,Fei Li,Jingxin Qi,Xinyu Chu,Hao Li,Ting Shi,Zhen Yan,Lei Yang,Xiaofei Xin,Lisha Liu,Xiaopeng Han,Lifang Yin
Ferroptosis has been proposed as one form of iron-dependent cell death, overgeneration of high-toxicity hydroxyl radicals (˙OH) tumor sites via Fenton reactions induced cell membrane damage. However, the insufficient intracellular concentrations of both iron and H2O2 limited the anticancer performance of ferroptosis. In this study, ROS-sensitive prodrug nanoassemblies composed of a PEG2000-ferrous compound and a single thioether bond bridged dihydroartemisinin-paclitaxel prodrug were constructed, which fully tapped ex/endogenous iron, ferroptosis inducers, and chemotherapeutic agents. Following cellular uptake, the intracellular oxidizing environment accelerated the self-destruction of nanoassemblies and triggered drug release. In addition to the chemotherapeutic effect, the activated dihydroartemisinin was capable of acting as a toxic ˙OH amplifier via the reinforced Fenton reaction, simultaneously depleting intracellular GSH, as well as inducing glutathione peroxidase 4 inactivation, further enhancing ferroptosis-dependent cancer cell proliferation inhibition. Meanwhile, the ROS generation-inductive and cell cycle arrest effect from the paclitaxel augmented synergetic ferroptotic-chemotherapy of cancer. Thus, the prodrug integrating dihydroartemisinin with paclitaxel via a single thioether bond represents a potent nanoplatform to exert amplified ferroptotic-chemotherapy for improved anticancer efficacy.
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Soft Matter
·
2023
·Vol. 19
·期 14
·2570-2578
·
IF 3.4
Xiaodong Wan,Yunfeng He,Caicong Li,Canhui Yang
Eutectogels are stretchable ionic conductors extensively developed in recent years, owing to their distinct advantages of low cost, non-volatility, non-toxicity, and outstanding biocompatibility. However, the susceptibility to humidity caused by the exchange of water molecules between the interiors of eutectogels and the external environment greatly restricts their practical applications. Here, a dip-coating strategy is proposed to fabricate a P(MEA-co-IBA) elastomer-coated P(AAC-co-AAM) eutectogel to achieve satisfactory humidity-resistant capability. The hydrophobic elastomer coating significantly suppresses water exchange without harming the stretchability (>500%) and conductivity of the eutectogel. Strong adhesion forms at the eutectogel-coating interface due to the formation of an interpenetrating layer. The superior electromechanical performances of encapsulated eutectogels enable stretchable ionotronic devices with stable electrical performance (>1 h) and remarkable water-droplet/moist resistances during static/dynamic loadings. A humidity-resistant encapsulated eutectogel-based wearable strain sensor is further demonstrated. The proposed humidity-resistant eutectogels are promising candidates for soft and wearable ionotronics for practical applications.
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Processes
·
2023
·Vol. 11
·期 3
·903
·
IF 3.5
Yajie Wang,Xin Dong,Chengfeng Liu,Peng Cheng,Gilles Mailhot
The decolorization of azo dye Orange II using a UVA-Fe3+-PMS-oxalate system was studied. A series of experiments was performed to investigate the effects of several variables, including the pH, PMS dosage, Fe3+concentration, oxalate concentration, and coexisting anions. The results revealed that a lower pH facilitated the decolorization, and relatively high decolorization efficiency (97.5%) could be achieved within 5 min at pH 3.0. The electron paramagnetic resonance (ESR) and radical quenching experiments revealed that SO4•−played a crucial role in the decolorization of Orange II (85.8%),•OH was of secondary importance (9%), and1O2made a small contribution to the decolorization (5.2%). Furthermore, the formation of•OH in the experimental system strongly depended on HO2•/O2•−. These reactive oxidants were able to directly attack the azo bond of the luminescent group in Orange II and initiate the decolorization process. The efficient UVA-Fe3+-PMS-oxalate system showed great application potential in the treatment of wastewater contaminated by azo dyes.Keywords:PMS activation;Orange II;decolorization;UVA irradiation;Fe3+-oxalate complexes
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WASTE MANAGEMENT
·
2023
·
IF 8.1
Man Zhang,Rubo Tian,Siyang Tang,Kejing Wu,Binshen Wang,Yingying Liu,Yingming Zhu,Houfang Lu,Bin Liang
Bamboo pulp and papermaking produce a lot of bamboo powder waste, and its resource utilization is of great significance for biomass refining and environmental protection. Here, we propose an integrated approach involving mechanical activation, hydrothermal extraction, and deep eutectic solvents (DESs) multiple delignification for the efficient separation of bamboo powder. Among seven carboxylic acids based DESs, choline chloride (ChCl)-lactic acid (La) DES (1:1) is the most effective, with over 78.0% lignin removal and 88.9% cellulose retained after mechanical-hydrothermal (180 °C, 5 h)-DES (110 °C, 12 h) treatment. Notably, 84.7% of delignification is achieved after three times of ChCl-La DES treatment at 70, 90, and 110 °C respectively. The delignification rate is negatively correlated with the amount of carboxyl group in the DESs. The lower the p K a value, the higher the delignification rate. Additionally, the selectivity for lignin is improved with decreasing solvent polarity. DES treatment effectively degrades the guaiacyl unit lignin fractions and disrupts several β-aryl-ether bonds (e.g., β-O-4, β-β, and β-5). Furthermore, DESs exhibit good recyclability, with less than 10% reduction in delignification after three cycles. Theory calculations confirm that ChCl-carboxylic acid DESs could compete with lignin to break hydrogen bonds in lignocellulosic biomass by providing their chloride, hydroxyl, and carboxyl groups. Overall, this study demonstrates the practical significance of multistage treatment for the effective fractionation of biomass into its three components.
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