INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Huanhui Zhan,Ju Liu,Ping Wang,Chenfei Wang,Zhongguo Wang,Muhua Chen,Xinbao Zhu,Bo Fu
In the field of building energy conservation , the development of biodegradable biomass aerogels with excellent mechanical performance, flame retardancy and thermal insulation properties is of particular importance. Here, a directional freeze-drying method was used for fabricating composite sodium alginate (SA) aerogels containing functionalized ammonium polyphosphate (APP) flame retardant . In particular, APP was coated with melamine (MEL) and phytic acid (PA) by a supramolecular assembly process. Through optimizing the flame retardant addition, the SA-20 AMP sample exhibited excellent flame retardant and thermal insulation properties, with the limiting oxygen index of 38.2 % and the UL-94 rating of V-0. Such aerogels with anisotropic morphology demonstrated a low thermal conductivity of 0.0288 (W/m·K) in the radial direction (perpendicular to the lamellar structure). In addition, as-obtained aerogels displayed remarkable water stability and mechanical properties, indicating significant potential for practical applications.
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高影响因子
LANGMUIR
·
2024
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IF 3.7
Ze Qiu,Yingzhangyang Liu,Wencai Cheng,Congcong Ding
In this research, we focus our attention on the leaching peculiarity of uranium-containing Mg–Al layered double hydroxide (LDH) which is one kind of waste sediment in uranium tailings, generated by the alkalinization of uranyl raffinate. The effect of inorganic (CO32–, SO42–, PO43–) and organic (C2O42–, C6H6O72–, C6H16O24P62–) anions were investigated. Atomic force microscopy result showed that the thickness of CO32–-LDH increased to 8.6 nm compared to original LDH whose thickness was 6.7 nm. Compared with the control sample (5.58 μm), the grain size with C6H16O24P62– anion grew to 7.04 μm. A large amount of CO32– can stay in LDH, up to 1.78 mol percent, while the C6H16O24P62– anion was only 0.41 mol percent. X-ray diffraction results showed that the anions could change the crystal structure of LDH, especially the C6H18O24P6 anion, and theoretical calculation also conformed this result. The leaching tests showed that the introduction of anions improved the leaching efficiency of UO22+ from LDH. The introduction of anions destroyed the super buffer property of LDH. Theoretical calculation results indicated that the anions could grab UO22+ and help the UO22+ escape from the LDH. This research gave guidance for long-term disposal of uranium-containing tailings.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Zhoujie Wang,Yan Xiang,Wenjun Guo,Min Liu,Xing Gao,Guohuan Li,Lei Sun,Wei Sun,Longhua Xu,Lei Xie
Flotation separation of different minerals is based on the selective modulation of mineral surface properties by flotation reagents. However, a quantitative understanding of the facet-dependent interaction mechanism of different functional groups in typical flotation reagents still remains elusive, resulting in the challenge in accurate modulation of surface interaction in mineral separation processes. Herein, taking a typical serpentine-pyrite flotation system, the chemical force microscopy technique was used to quantitatively measure the intermolecular interactions of various self-assembled monolayers (i.e., OH-SAM, COOH-SAM, and PO 4 -SAM) with different serpentine planes (i.e., SiO basal, MgOH basal, and MgSiO edge) and pyrite surface in aqueous solution at the nanoscale. It was found that all the functional groups exhibited the attractive force with MgOH plane of serpentine during surface approach due to electrostatic double layer interaction, while a pure repulsion was detected on SiO and edge planes at both pH 5.5 and 8.5, indicating that MgOH plane was the dominant facet for reagent adsorption. At the typical flotation condition of pH 8.5, the strong adhesion was observed for –COOH groups interacting with both MgOH plane and pyrite surface during retraction attributed to the metal complexation, while –OH groups were much more adhesive on pyrite surface than that on MgOH plane. In contrast, a strong adhesion on MgOH plane (21.09 ± 0.25 mN m −1 ) and relatively weak adhesion on pyrite (14.93 ± 0.64 mN m −1 ) were respectively observed for −PO 4 groups, which implied the excellent selectivity of −PO 4 groups. Density functional theory (DFT) simulation also indicated the stronger adsorption energy of −PO 4 group with MgOH plane (−73.7 kcal mol −1 ) than pyrite surface (+62.7 kcal mol −1 ). Moreover, the excellent separation performance of phosphoric acid-based reagents was further confirmed during serpentine-pyrite flotation experiments. This work provides quantitative information on molecular interaction mechanisms underlying the adsorption of functional groups on different mineral planes at the nanoscale, which also helps develop a molecular design principle for chemical additives to achieve the selective modulation of target mineral planes in complex mineral pulps.
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JOURNAL OF POWER SOURCES
·
2024
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IF 8.1
Yuanze Meng,Zihao Li,Liying Wang,Xijia Yang,Yue Yang,Xuesong Li,Yi Jiang,Yang Gao,Wei Lü
In this study, first principles calculations are performed to investigate the relevant energy storage mechanisms of PEDOT:PSS membranes and WO 3 /MnO 2 . The calculation results indicate that the modified PEDOT:PSS reduces the interaction force between cation and inorganic material lattice , weakens the adsorption energy, and accelerates the electrochemical reaction kinetics. Simultaneously, the prepared composite material exhibits a higher state density and more energy orbitals. The cations of the electrolyte can be stored in the s and p orbitals of the material, leading to significant hybridization of electron clouds in these orbitals and improving the conductivity of the material. Based on the above calculation results, a WO 3 /MnO 2 self-healing electrochromic energy storage device is prepared. The device has a high specific capacitance (10.81 mF cm −2 ) and excellent cycle retention performance (97% retention rate after 1000 cycles), which ensures its efficient energy storage and reliable durability. Furthermore, the device has the self-healing capability to restore most of its functions even in the event of damage, ensuring its long-term utilization.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Huihui Zhang,Mengmeng Kang,Xin Shi,Yubo Xu,Qiaoqiao Liu,Bingcheng Ge,Shuyan Gao
The extensive and inflexible molecular structure, coupled with the significant presence of ionized carboxyl groups (−COO–) and hydroxyl groups (−OH) in carboxymethyl cellulose (CMC), leads to inadequate water resistance and mechanical properties of films made from CMC. Consequently, their application in the packaging industry is limited. Herein, CMC/sodium alginate (SA)/carbon quantum dots (CQDs)/H+ (CSCH) films are prepared by ionized carboxyl protonation (acid impregnation) using CMC as a substrate and SA as a reinforcement filler. The protonation of the −COO– groups of CMC and SA by the H+ from the acid reduces the electrostatic repulsion between the molecular chains of CMC and SA. Meanwhile, this also strengthens the hydrogen-bonding network within the CMC composite film and collaborates with SA to enhance the strength of the CMC composite film and improve its water resistance. Additionally, the introduction of CQDs provides excellent ultraviolet (UV)-shielding properties of CSCH films. As a result, the water-resistant CSC2H150 film exhibits outstanding mechanical properties (tensile strength: 60.00 MPa), water resistance (solubility rate: 20.32%), and an average UV transmittance of 5.18%. The study proposes a simple approach for making water-resistant UV-shielding packaging materials with good mechanical properties, promising many applications.
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INORGANIC CHEMISTRY
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2024
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IF 4.3
Jinlong Liu,Ziyu Luo,Jiayun Wu,Dong Qian,Weixiong Liao,Geoffrey I. N. Waterhouse,Xiangxiong Chen
The oxygen reduction reaction (ORR) plays a vital role in many next-generation electrochemical energy conversion and storage devices, motivating the search for low-cost ORR electrocatalysts possessing high activity and excellent durability. In this work, we demonstrate that iron–cobalt phosphide (FeCoP) nanoparticles encapsulated in a N-doped carbon framework (FeCoP@NC) represent a very promising catalyst for the ORR in alkaline media. The core–shell structured FeCoP@NC catalyst offered outstanding ORR activity with a half-wave potential (E1/2) of 0.86 V vs reversible hydrogen electrode (RHE) and excellent stability in a 0.1 M KOH electrolyte, outperforming commercial Pt/C and many recently reported noble-metal-free ORR electrocatalysts. The superiority of FeCoP@NC as an ORR electrocatalyst relative to Pt/C was further verified in prototype zinc-air batteries (ZABs), with the aqueous and flexible ZABs prepared using FeCoP@NC offering excellent stability, impressive open circuit voltages (1.56 and 1.44 V, respectively), and high maximum power densities (183.5 and 69.7 mW cm–2, respectively). Density functional theory calculations revealed that encapsulating FeCoP nanoparticles in N-doped carbon shells resulted in favorable electron penetration effects, which synergistically regulated the adsorption/desorption of ORR intermediates for optimal ORR performance while also boosting the electronic conductivity. Our findings offer valuable new insights for rational design of transition metal phosphide-based catalysts for the ORR and other electrochemical applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Hongwei Wang,Tsung-Cheng Yang,Hao Zheng,Zeyi Jiang,Chia-Min Yang,Nien-Chu Lai
Transition metal-based nanoparticles (NPs) are emerging as potential alternatives to platinum for catalyzing the oxygen reduction reaction (ORR) in zinc-air batteries (ZAB). However, the simultaneous coexistence of single-atom moieties in the preparation of NPs is inevitable, and the structural complexity of catalysts poses a great challenge to identifying the true active site. Herein, by employing in situ and ex situ XAS analysis, we demonstrate the coexistence of single-atom moieties and iron phosphide NPs in the N, P co-doped porous carbon (in short, Fe-N 4 -Fe 2 P NPs/NPC), and identify that ORR predominantly proceeds via the atomic-dispersed Fe-N 4 sites, while the presence of Fe 2 P NPs exerts an inhibitory effect by decreasing the site utilization and impeding mass transfer of reactants. The single-atom catalyst Fe-N 4 /NPC displays a half-wave potential of 0.873 V, surpassing both Fe-N 4 -Fe 2 P NPs/NPC (0.858 V) and commercial Pt/C (0.842 V) in alkaline condition. In addition, the ZAB based on Fe-N 4 /NPC achieves a peak power density of 140.3 mW cm −2 , outperforming that of Pt/C-based ZAB (91.8 mW cm −2 ) and exhibits excellent long-term stability. This study provides insight into the identification of true active sites of supported ORR catalysts and offers an approach for developing highly efficient, nonprecious metal-based catalysts for high-energy–density metal-air batteries.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
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IF 1.5
Liang Lili,Cheng Qian,Yang Zhou,Lin Xiaoyan,Chen Yan,Luo Xuegang
The extraction of uranium from strong acidic radioactive wastewater is vital and challenging to sustainable development of nuclear energy. In order to improve the selective uranium adsorption, a phytic acid decorated multiple hydorgel network (MA-U-PA/GG-CS-Ca) was constructed by incorporating phytic acid modified covalent organic polymers to gellan gum and chitosan hydrogel by supramolecular self-assembly. The results indicated that the selectivity ratio (SU) of MA-U-PA/GG-CS-Ca for uranium adsorption increased from 28 to 72%. The adjacent –P = O groups within the phytic acid molecule reduces the free energy of the coordination reaction with uranium, which is favorable to the uranium adsorption under acidic condition.
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Materials Today Communications
·
2024
·
IF 3.7
Shuoshuo Yu,Xin Li,Ting Zhang,Xiaofeng Yuan,Liqing Chen,Bochao Yang,Yi Wang
In order to improve the shape stability of phase change materials (PCMs) while ensuring excellent thermal energy storage / release and photo-thermal conversion performance, three-dimensional metal-organic network (MON) containing polyethylene glycol (PEG) and graphene oxide (GO) composite phase change gels (PEG/MON-G) were prepared. The morphology, structure and thermal-physical properties of the gels were investigated by various instruments. The results indicated that PEG was embedded in the three-dimensional MON constructed by coordination and hydrogen bonding of zinc ions , phytic acid and Kevlar nanofibers , ensuring the shape stability of PEG/MON-G up to 120 °C within the experimental range. Due to the dynamic fracture and recombination of coordination and hydrogen bonding interactions, the composite PCMs exhibited excellent deformability. The melting and crystallization enthalpy of PEG/MON-G containing 89.5 wt% of PEG were 143.9 J·g −1 and 141.0 J·g −1 , respectively. PEG/MON-G also had good thermal reliability, in which the phase transition temperature of the melting process reduced by only 0.1 °C and the enthalpy changed only 1.4% after 200 cycles. In addition, the photo-thermal conversion efficiency of the composite phase change gels reached 74.6%. In conclusion, this study provides a new strategy for preparing the shape-stabilized PCMs.
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BMC Chemistry
·
2025
·Vol. 19
·期 1
·1-12
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IF 4.6
Yin Tingting,Li Qiaowen,Sun Huan,Zheng Jin,Wang Yuanyuan,Luo Yi,Wang Li
Background This work intended to assess the disinfection efficacy of hypochlorous acid (HA) and silver nanoparticles (AgNP) disinfectants in disinfecting the dental unit waterlines (DUWL) during comprehensive oral treatment and explore their potential applications in the oral medical environment. Methods: Firstly, AgNP solution was prepared and evaluated through X-ray diffraction (XRD), field emission transmission electron microscope (FE-TEM), and stability tests. Subsequently, 15 dental units were selected and randomly assigned to three groups, each receiving a different disinfection method. Specifically, one group (5 units) received HA disinfectant (HA group), one group (5 units) received AgNP disinfectant (AgNP group), and another group (5 units) received a combination of HA and AgNP disinfectant (HA + AgNP group). Bacterial counts before and after disinfection were compared and analyzed at four sites on the dental units: high-speed handpiece tubing, mouthwash, ultrasonic scaler, and three-way syringe. Results The growth of biofilm on the waterlines was observed using scanning electron microscopy (SEM) and laser confocal microscopy (LCM). The results indicated that AgNP solution was successfully prepared and demonstrated excellent stability. There was no significant difference in the average weekly number of patients treated across the three groups ( P > 0.05). After disinfection, bacterial counts were significantly reduced in all groups. Compared to the HA and AgNP groups, the HA + AgNP group exhibited a markedly lower bacterial count, with statistical significance ( P < 0.05). The compliance rates observed during the first disinfection and two weeks post-disinfection were slightly lower in the HA and AgNP groups compared to the HA + AgNP group, although no significant statistical difference was found ( P > 0.05). SEM images revealed uneven biofilm plaques on the inner surface of the pipes prior to disinfection, embedded within a dense matrix, while the biofilm was visibly disrupted post-disinfection. LCM software analysis showed that, compared to the HA and AgNP groups, the HA + AgNP group had a significantly lower percentage of live bacteria on the biofilm post-disinfection ( P < 0.05). Conclusion Compared to any single disinfectant regimen, the combined use of HA and AgNPs effectively inhibited bacterial growth and exerted a significant destructive effect on biofilms. Therefore, this combination is expected to be a viable option for disinfection of DUWL in the oral healthcare setting. Clinical trial number Not applicable.
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Frontiers in Materials
·
2024
·
IF 2.6
Xing Min,Zhang Haifeng,Li Zhiyao,Zhang Ling,Qian Wenhao
Developing bacterial biofilm on the dental unit waterlines increases the risk of cross-infection among oral patients. Although chemical disinfectants can achieve disinfection effects in a short period of time, corrosion damage of dental unit waterlines and water contamination can also occur after continuous use of it. Herein, this study explored a one-step deposition method to prepare a durable and renewable antibacterial N-halamine polymeric coating on polyurethane waterlines. The method utilized polyelectrolyte complexes formed with polyethylenimine (PEI) and phytic acid (PA), followed by chlorination to activate the antibacterial properties. The N-halamine polymeric coating reduces the polyurethane waterline’s water contact angle, thus reducing biofouling deposits and the obstruction of the active halide site on the waterlines, thereby facilitating the maintenance of the cleanliness of the coating. In addition, benefiting both from the active chlorine release and the high density of positive charges on the coating, the polyurethane waterline antimicrobial activity is significantly enhanced. Besides, the N-halamine polymeric coating is biocompatible. This study showed that long-lasting and renewable antimicrobial requirements can be achieved by simple surface modification of N-halamine polymer coatings, which provides a practicable strategy for the production of long-term and reproducible antibacterial dental unit waterlines to reduce the incidence of hospital infection in oral department.
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Lubricants
·
2025
·Vol. 13
·期 3
·103
·
IF 2.9
Wei Li,Huanyi Chen,Long Chen,Shanqin Ge,Qingzhao Cai,Genxiang Gong,Jinhong Yu,Kazuhito Nishimura,Nan Jiang,Tao Cai
Hydraulic technology has been instrumental in the extensive application of offshore mechanical equipment, particularly in drilling platforms and ships, where high-performance hydraulic fluids are essential for safe and efficient operations. Addressing the urgent need for water-based hydraulic fluids as an alternative to traditional oil-based fluids, this study introduces a novel water-based hydraulic fluid fortified with phytic acid, derived from plant seeds, to achieve low biotoxicity, low coefficient of friction, and reduced frictional heat generation. The integration of phytic acid has significantly enhanced the lubricating performance, reducing the average coefficient of friction to as low as 0.013, as tested by the four-ball tester, which is the lowest value reported to date. Real-time monitoring of the temperature rise of the friction testing apparatus using an infrared thermal imager revealed a 78.6% reduction in temperature increase. Acute toxicity assays using Brine Shrimp demonstrated that the 96 h LC50 value for the water–glycol flame-resistant hydraulic fluid with added phytic acid exceeded 26,304 mg/L, indicating low toxicity. Characterization analyses elucidated the mechanisms underlying the improved tribological properties, highlighting the potential of this eco-friendly fluid for safe and efficient offshore operations.
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危险品化学品经营许可证（带存储）