COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Xinjiao Tian,Wenying Wang,Yixiang Huang,Hongxiang Wang,Hao Wei,Rui Wang,Zhenming Li
Although much work has been reported on anticorrosive coatings at this stage, most materials are confronted with a variety of harsh environments in practical applications, posing extreme challenges to the various properties of the coatings. In this study, carbon nanotube/montmorillonite/polyphenylene sulfide (CNTs/MMT/PPS) composite coatings were prepared by air spraying method. CNTs-MMT composite fillers with nanostructures were prepared by the amide reaction of 3-aminopropyltriethoxysilane (APTES) modified MMT and carboxylated CNTs. The particle size distribution test demonstrated that the amidated CNTs-MMT exhibited superior dispersion performance compared to CNTs and MMT alone, resulted in a more homogeneous and dense coating. The coatings obtained by combining the low surface energy of polytetrafluoroethylene (PTFE) exhibits hydrophobicity and has excellent self-cleaning properties. The electrochemical corrosion current density of the composite coating was three orders of magnitude lower than that of bare iron, and the corrosion efficiency was 99.43 %, demonstrating excellent corrosion resistance . The thermogravimetric test results showed that the CNTs/MMT/PPS composite coatings displayed excellent thermal stability up to 530 °C. Therefore, the CNTs/MMT/PPS composite coating possesses significant advantages in the field of anti-corrosion due to its enhanced durability, heat resistance, and corrosion resistance .
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2019
·
IF 3.621
Hongzhou Xie,Hongxu Meng,Linbo Wu,Bo-Geng Li,Philippe Dubois
Poly(ethylene 2,5-furandicarboxylate) (PEF) is an emerging biobased polyester well-known for high gas barrier properties as well as high tensile modulus and strength , but PEF modification is still desired to improve its crystallization rate, toughness and even strength. In this study, PEF/Montmorillonite (MMT) nanocomposites were in-situ synthesized via melt polycondensation of dimethyl furandicarboxylate and ethylene glycol in the presence of a commercially available organically modified montmorillonite (OMMT), i.e., DK2, a montmorillonite clay modified with octadecyl hydroxyethyl dimethyl ammonium. The structure of nanocomposites was characterized by ATR-FTIR, 1 H NMR, WAXD and TEM, and their thermal and mechanical properties were assessed with DSC, TGA and tensile test. The OMMT was grafted with PEF chains and therefore exfoliated, at least partially, in the PEF matrix with intrinsic viscosity over 0.7 dL/g. With respect to pristine PEF, the nanocomposites containing 2.5 wt% DK2 showed significantly improved melt crystallization, tensile modulus and strength.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2014
·Vol. 25
·期 8
·872-880
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IF 1.964
Hongfang Zhu,Juan Li,Yingke Zhu,Shengjiao Chen
Three kinds of organic intercalation agent containing flame retardant groups, melamine (MA), triphenylphonium (TPP) chloride, and tetradecyl trihexyl phosphonium (TTP) bromide were intercalated into montmorillonite (MMT) via cation exchange reactions. These modified MMTs are combined with intumescent systems and compounded with PP. The flame retardant and thermal properties of the PP composites are studied. The organic intercalation agents in the layers of MMT play important roles in the char formation and flame retardant properties of PP composites. MA shows a better performance in limiting oxygen index (LOI) value and TPP helps to increase UL-94 properties, whereas TTP maintains or deteriorates the flame retardancy of polypropylene/intumescent flame retardant (IFR) composites. The LOI and UL-94 properties increase firstly and then decrease as the content of MMT increases. The MA acts as a blowing agent and emits an inert gas to provide migration impetus, which results in a better intumescent structured and stronger char to endure heat erosion. Although TPP and TTP emit combustible gas that burn, especially for TTP as it has a more flammable aliphatic chain. The synergistic effect between MA-MMT and IFR is better than that for TPP-MMT and TTP-MMT. Copyright © 2014 John Wiley & Sons, Ltd.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2023
·
IF 8.7
Congling Shi,Mei Wan,Jiahao Duan,Xiaodong Qian,Honglei Che,Jian Li,Fei Ren,Junyi Li,Ling Yang
In this manuscript, the core-shell flame retardants based on chitosan@MMT coated ammonia polyphosphate (APP@CS@MMT) was prepared and then incorporated into the TPU matrix. Through analyzing the effects of the flame retardant on the property reinforcements, it’s found that TPU/APP@CS@MMT composites have the excellent flame retardant and smoke suppression performance. The pHRR, THR, pSPR and TSP of TPU/APP@CS@MMT composites were remarkably decreased by 62.58%, 71.56%, 90.43%, 83.22%, and 93.60%, respectively. Furthermore, the mass of residual chars increased significantly from 0.85% for pure TPU to 21.95% for TPU/APP@CS@MMT composites. The TPU/APP@CS@MMT composites can improve both the flame-retardant and smoke suppression performances of TPU . Through the thermogravimetric test, cone calorimetry test, and char structure analysis, the flame retardant mechanism of the TPU/ APP@CS@MMT composites was also investigated. The APP@CS@MMT mainly plays its flame retardant role in the condensed phase. This work also provides a green and facile methodology for creating flame retardant TPU and helps broaden the TPU’s practical application in industry.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 6
·1413
·
IF 5
Dongyin Wang,Changfeng Chen,Xiaojuan Hu,Fei Ju,Yangchuan Ke
Novel polymer nanocomposites of methacryloyloxy ethyl dimethyl hexadecyl ammonium bromide-modified montmorillonite (O-MMt) with acrylamide/sodiump-styrene sulfonate/methacryloyloxy ethyl dimethyl hexadecyl ammonium bromide (ASD/O-MMt) were synthesized via in situ polymerization. The molecular structures of the synthesized materials were confirmed using Fourier-transform infrared and1H-nuclear magnetic resonance spectroscopy. X-ray diffractometry and transmission electron microscopy revealed well-exfoliated and dispersed nanolayers in the polymer matrix, and scanning electron microscopy images revealed that the well-exfoliated nanolayers were strongly adsorbed on the polymer chains. The O-MMt intermediate load was optimized to 1.0%, and the exfoliated nanolayers with strongly adsorbed chains were controlled. The properties of the ASD/O-MMt copolymer nanocomposite, such as its resistance to high temperature, salt, and shear, were significantly enhanced compared with those obtained under other silicate loads. ASD/1.0 wt% O-MMt enhanced oil recovery by 10.5% because the presence of well-exfoliated and dispersed nanolayers improved the comprehensive properties of the nanocomposite. The large surface area, high aspect ratio, abundant active hydroxyl groups, and charge of the exfoliated O-MMt nanolayer also provided high reactivity and facilitated strong adsorption onto the polymer chains, thereby endowing the resulting nanocomposites with outstanding properties. Thus, the as-prepared polymer nanocomposites demonstrate significant potential for oil-recovery applications.Keywords:copolymer nanocomposite;controlling exfoliated O-MMt nanolayer;high-temperature resistance;salt resistance;enhanced oil recovery
研究领域:
材料科学
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纳米技术
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石油工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
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2016
·Vol. 6
·期 47
·41420-41427
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IF 3.289
Guohui Li,Avinav G. Nandgaonkar,Keyu Lu,Wendy E. Krause,Lucian A. Lucia,Qufu Wei
The engineering of supports for enzyme immobilization while retaining competent functionality is nontrivial. We attempted to enhance the removal efficiency of organics by adopting a relatively novel approach involving a synergy from the adsorption capabilities of a support incorporated with organically modified montmorillonite (O-MMT) and catalytic properties of immobilized laccase. Electrospun polyacrylonitrile (PAN)/O-MMT membranes after alkaline hydrolysis and carboxyl activation were chosen as the support system for laccase immobilization. A confocal laser scanning microscope confirmed a uniform enzyme distribution along with the fibers' longitudinal surface. After enzyme immobilization, the optimum pH shifted from 3 to 3.5, while the optimum temperature remain unchanged at 50 °C. Its stability was preserved despite a large fluctuation in pH (50% of its initial activity retained over the pH range 2–6) and temperature (more than 80% of its initial activity retained over 30–70 °C). Compared to free laccase, the thermal stability of the immobilized laccase was improved after being under 30 °C and 50 °C for 8 h. The operational stability was 68% of the initial one after 10 times repeated usage, while also demonstrating 80% storage stability of the initial activity even after two months. The immobilized laccase showed a high removal efficiency of crystal violet at an optimum pH of 5 and temperature ∼40 °C as well as an initial substrate concentration of 100 mg L−1. Compared with that of the individual support and the free laccase, the removal efficiency by an immobilized enzyme is far higher to confirm a synergy in the immobilized enzyme and support system.
研究领域:
生物技术
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环境科学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Chongzheng Zhu,Zhongpu Xu,Henglong Zhang,Zhichao Wang,Deqi Li,Ningyi Su,Dongmei Zhang
To enhance the long-term service performance of asphalt pavements under aging conditions, this study investigated the effects of nano-CeO 2 /montmorillonite (MMT) composites at different ratios (CM0.2, CM0.5, CM1.0) on the rheological properties and microstructural characteristics of asphalt subjected to various aging protocols. By employing dynamic shear rheological (DSR), gel permeation chromatography (GPC), and atomic force microscopy (AFM) tests, the performance changes of nano-CeO 2 /MMT composite-modified asphalt (CMMA) under thermal-oxidative aging (rolling thin film oven (RTFOT, 163 ℃, 85 min), pressure aging vessel (PAV, 100 ℃, 2.1 MPa, 20 h)) and ultraviolet (UV, 60 ℃, 6 d) aging was systematically analyzed. The CM0.5 composite demonstrated superior anti-aging efficacy: the UV absorption capability of CeO 2 synergized with the lamellar physical barrier effect of MMT to effectively inhibit oxidative cross-linking of asphalt macromolecules. Compared to the base asphalt, CMMA with CM0.5 (CMMA0.5) exhibited significantly enhanced rheological properties, including higher complex modulus and rutting factor, along with outstanding high-temperature deformation resistance. Following UV aging, CMMA0.5 showed a 44 % reduction in the complex modulus aging index (CMAI) at 60 °C compared to the base asphalt. AFM results further confirmed the stability of the "bee structure" in CMMA0.5 before and after UV aging, with minimal variations in surface roughness, modulus, and adhesion force. The nano-composite modification strategy proposed here achieves functional complementarity between CeO 2 ’s UV absorption and MMT’s physical barrier, offering an innovative solution for improving asphalt pavement durability.
研究领域:
材料科学
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道路工程
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高分子化学
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表面科学
·
环境耐久性
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Science
·
2019
·Vol. 7
·期 10
·4299-4309
·
IF 5.251
Ya Wu,Minghui Sun,Dan Wang,Genyun Li,Jiangeng Huang,Songwei Tan,Lin Bao,Qian Li,Gao Li,Luqin Si
To effectively alleviate acute severe ulcerative colitis (ASUC), we developed a colon-specific delivery system—PLGA–KPV/MMT/CS multifunctional medicinal nanoparticles loaded with cyclosporine A (CyA). The lysine–proline–valine (KPV) tripeptide, which possesses anti-inflammatory properties and high affinity to peptide transporter 1 (PepT1), can target therapy-related cells (colonic epithelial cells and macrophages) via overexpression of PepT1. Montmorillonite (MMT)/chitosan (CS) coating can reduce CyA leakage in the upper gastrointestinal tract (GIT) and enhance nanoparticle adhesion to the inflamed colon. The bio-distribution demonstrated that nanoparticles can specifically accumulate in the inflamed tissues and can be retained for up to 36 h. After being treated with the CyA–PLGA–KPV/MMT/CS nanoparticles (PKMCN), the mice with DSS-induced ulcerative colitis exhibited significant improvements in body weight, colon length, and disease activity index. Moreover, biochemistry and immunohistochemical analysis showed that the PKMCN treatment group performed as well as the healthy group. Intriguingly, PKMCN without CyA also presented marked therapeutic effects. Our results suggested that PKMCN could be a promising drug delivery system for ASUC therapy by targeting inflamed cells, prolonging curative time, and mitigating colitis.
研究领域:
药学
·
胃肠病学
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纳米医学
·
炎症性肠病
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xikun Zhang,Yang Su,He Zhang,Yukai Wang,Yu Chang,Shurui Yi,Junzheng Chen,Di Fang,Xue Lv,Lu Liu
A novel composite hydrogel prepared from polyacrylamide (PAM), polydopamine-modified montmorillonite (PDA@MMT), graphene and hydroxypropyl cellulose (HPC), loaded with Ag NPs, was prepared for the catalytic degradation of methylene blue (MB) and Congo red (CR) using in situ reduction. HPC significantly enhanced the dispersion of PDA@MMT within the hydrogel, endowing the hydrogel with excellent mechanical properties, with stress and strain of 1773 kPa and 4005 %, and elastic modulus and toughness of 43.4 kPa and 29.54 MJ/m 3 , respectively. The introduction of graphene (GN) increased the rate of electron transfer during the catalytic process and significantly improved the catalytic efficiency, with catalytic rate constants of 1.360 and 0.803 min −1 for MB and CR at 20 °C, respectively. The hydrogels were endowed with excellent antimicrobial properties due to the introduction of Ag NPs. In the future, this hydrogel is expected to play an important role in environmental pollution control.
研究领域:
材料科学
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环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Bio
·
2026
·
IF 11
Yinxi Li,Qinxuan Zhou,Yuxuan She,Bin Lu,Mengting Wu,Tianhao Chen,Pengcheng Ye,Li Yu,Wenzhao Liu,Hui Deng,Xiaowen Hu
Inflammatory bowel disease (IBD) is a chronic gastrointestinal disorder characterized by a self-perpetuating pathological loop, where excessive reactive oxygen species (ROS) induce mucosal inflammation, which in turn drives further ROS production. This oxidative-inflammatory cycle leads to intestinal epithelial barrier disruption and gut microbiota dysbiosis. Current immunosuppressive therapies primarily target downstream inflammation, while fail to address the foundational oxidative stress and achieve complete mucosal healing. To bridge this gap, we developed an orally deliverable nanozyme platform by anchoring cobalt oxide (Co 3 O 4 ) nanoparticles onto montmorillonite nanosheets (Co 3 O 4 @MMT). This design leverages the Co 2+ /Co 3+ redox cycling within Co 3 O 4 for efficient multi-enzymatic ROS scavenging. Furthermore, transcriptomic analysis and literature evidence suggest that the released Co 2+ ions can activate the HIF-1α pathway—a key regulator of epithelial repair. The MMT component protects the nanozyme from gastrointestinal degradation and facilitates its electrostatic accumulation at inflamed colonic sites. In murine colitis models, oral Co 3 O 4 @MMT treatment effectively alleviated disease severity, suppressed inflammation, restored barrier integrity, and rebalanced gut microbiota. This work presents an integrated oral strategy that concurrently targets oxidative stress, inflammation, and barrier restoration, offering a comprehensive therapeutic approach for IBD.
✓ 已验证
DOI
PubMed
高影响因子
Water
·
2020
·Vol. 12
·期 12
·3583
·
IF 2.544
Junying Yang,Minye Huang,Shengsen Wang,Xiaoyun Mao,Yueming Hu,Xian Chen
In this study, a magnetic copper ferrite/montmorillonite-k10 nanocomposite (CuFe2O4/MMT-k10) was successfully fabricated by a simple sol-gel combustion method and was characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), the Brunner–Emmett–Teller (BET) method, vibrating sample magnetometer (VSM), and X-ray photoelectron spectroscopy (XPS). For levofloxacin (LVF) degradation, CuFe2O4/MMT-k10 was utilized to activate persulfate (PS). Due to the relative high adsorption capacity of CuFe2O4/MMT-k10, the adsorption feature was considered an enhancement of LVF degradation. In addition, the response surface methodology (RSM) model was established with the parameters of pH, temperature, PS dosage, and CuFe2O4/MMT-k10 dosage as the independent variables to obtain the optimal response for LVF degradation. In cycle experiments, we identified the good stability and reusability of CuFe2O4/MMT-k10. We proposed a potential mechanism of CuFe2O4/MMT-k10 activating PS through free radical quenching tests and XPS analysis. These results reveal that CuFe2O4/MMT-k10 nanocomposite could activate the persulfate, which is an efficient technique for LVF degradation in water.Keywords:magnetic;copper ferrite;montmorillonite-k10;levofloxacin;persulfate;response surface methodology
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Xiaopeng Yue,Panpan Cao,Miaoxiu Yang,Chaofan Li,Zhiwei Wang
A modified intumescent flame retardants/montmorillonite synergist with highly fire resistance and smoke suppression efficiency, based on the surface and interfacial modification of tannin , including bistratal microencapsulated ammonium polyphosphate particles (TFR), and Fe 3+ chelated tannin exfoliated montmorillonite nanoparticles (TM), was fabricated and used to prepare PBS based composites. TM exhibited excellent flame retardant and smoke suppression efficiency. With the incorporation of 5 wt% TM (95P/5TM), 30.8 % of limited oxygen index (LOI) value and UL-94 V-1 rating of composite could be achieved, and the total smoke production (TSP) of 95P/5TM decreased by 77.4 % compared with pure PBS, indicating its excellent smoke suppression effect. When the TFR and TM loadings were 24 wt% and 1 wt%, respectively, 36.8 % of LOI value and UL-94 V-0 rating of composite (75P/24TR/1TM) could be achieved, as well as 62.9 % lowered TSP compared with pure PBS. Tannin participated in both the condensed phase and gaseous phase reactions, and improved the carbon forming capacity during combustion. The enhanced flame retardant and smoke suppression efficiency for synergist were a combined result of catalytic, synergistic and physical shielding effects. This work offers a novel routing for fabricating polymer composites with excellent flame retardant and smoke suppression efficiency with the incorporation of natural polyphenols.
研究领域:
材料科学
·
阻燃材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）