APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Gaokuo Du,Huanrong Li,Zixuan Li,Xinchi Ye,Yige Wang
Quaternary ammonium/phosphine cations added to the platelets of Laponite clay can lead to the remarkable enhancement of luminescence efficiency of the europium (III) β-diketonate complex. The mechanism for the luminescence boosting by the organic cations was elucidated by comparing two diketonate ligands with different pKa and the pH value of the selected organic salts based on the stationery and time resolved spectroscopy. It can be concluded as that the presence of the quaternary ammonium or quaternary phosphine cations helps to form Eu 3+ -β-diketonate complexes with high coordination numbers by decreasing the acidic sites on the platelet surface of laponite clay. Our work further strengthens the simplicity and generalization of obtaining highly luminescent materials and provides a unique insight into the function of the quaternary ammonium/quaternary phosphine cations in boosting the luminescence of lanthanide-based organic-inorganic hybrid materials.
研究领域:
材料科学
·
光化学
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产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2020
·
IF 6.092
Jiabo Shi,Ruizhen Zhang,Na Yang,Yi Zhang,Bradley W. Mansel,Sujay Prabakar,Jianzhong Ma
Unraveling the interaction mechanisms of type I collagen with various inorganic nanoparticles is of pivotal importance to construct collagen-based bionanocomposites with hierarchical structures for biomedical, pharmaceutical, and other industrial applications. In this study, synthetic two-dimensional Laponite nanoplatelets (LAP NPs) are surface-functionalized with tetrakis(hydroxymethyl) phosphonium sulfate (THPS) for reinforcing their incorporation with type I collagen matrix by focusing on the influences of the interactions on the hierarchical structures of the collagen. Our results indicate that the LAP NPs can be successfully surface-functionalized with THPS via covalent bonds between the amine-functionalized NPs and the hydroxymethyl groups of THPS. Moreover, the resulting NPs can be well dispersed into the collagen matrix and evenly bound onto the collagen fiber strands and between the collagen fibrils, preserving the native D-periodic banding patterns of the collagen fibrils. The formation of covalent and hydrogen bonds between the collagen and the functionalized NPs can stabilize the intrinsic triple-helical conformation of the collagen, conferring the resulting collagen-based nanocomposites with improved thermal stability and enhanced mechanical properties. We anticipate that a fundamental understanding of the interactions between the collagen and functionalized inorganic nanoparticles would contribute to the design, fabrication, and further application of hierarchical collagen-based bionanocomposites with multifunctions.
研究领域:
生物材料学
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纳米医学
·
生物医药工程
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产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Peng Zhang,Jian Wang,Yu Jia,Wenqing Li,Xiaoling Tan,Dan Zhang,Shaonan Xu,Peiping Zhang,Cundi Wei,Shiding Miao
The Co-based spinel nanocrystals were fabricated by thermal decomposition of clay cages comprised with Laponite (LP) that were assembled on ZIF-67 frameworks (LP@ZIF-67). Spinel phases included Co 3 O 4 , FeCo 2 O 4 and MgCo 2 O 4 were produced and encapsulated within the Laponite cages (LP@spinel). The prepared materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscopy (TEM), N 2 adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analyses (TGA). It was indicated that the porous structure of Laponite and ZIF-67 was preserved after annealing at the temperature of ~400 °C. The XPS showed the binding energy of Co 2P in sample of LP@spinel shifted to lower values compared to the Co 3 O 4 which was obtained by annealing the pure phase of ZIF-67, and this demonstrates the catalytically active Co-centers were (220) facet-exposed in spinel nanocrystals. The material LP@spinel shares mesoporous structure with surface area of 135 m 2 ·g − 1 . The LP@spinel was found to exhibit brilliant performance on aerobic oxidation of cyclohexane to get cyclohexanone and cyclohexanol (KA oil). At a preset O 2 pressure of 2.0 MPa, the catalysis showed an outstanding conversion at 17.2% and the selectivity was found to reach 95.3% of KA oil for a typical reaction t = 5.0 h at T = 150 °C.
研究领域:
材料科学
·
催化化学
·
纳米技术
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产品关联
DOI
高影响因子
MOLECULAR BIOTECHNOLOGY
·
2020
·Vol. 62
·期 3
·192-199
·
IF 2.022
Wang Zhen,Hu Jinhua,Yu Jiakang,Chen Daquan
The purpose of this study was to construct a biomimetic urethral repair substitute. The nano-Laponite/polylactic acid–glycolic acid copolymer (PLGA) fiber scaffolds were produced to replicate the natural human urethra tissue microenvironment. PLGA (molar ratio 50:50) and Laponite were used in this study as raw materials. The nano-Laponite/PLGA scaffolds were fabricated via electrospinning technology. After preparing the material, the microstructural and mechanical properties of the nano-Laponite/PLGA scaffold were tested via scanning electron microscopy and electronic universal testing. The effects of different amounts of Laponite on the degradation of the nano-Laponite/PLGA scaffold were studied. Human umbilical vein endothelial cells (HUVECs) were co-cultured with PLGA and nano-Laponite/PLGA scaffolds for 24, 48, or 72 h. Scanning electron microscopy results illustrated that the microstructure of the scaffold fabricated by electrospinning was similar to that of the natural extracellular matrix. When the electrospinning liquid contained 10% Laponite, the nano-Laponite/PLGA stress–strain curve illustrated that the scaffold has strong elastic deformation ability. HUVECs exhibited good growth on the nano-Laponite/PLGA scaffold. When the scaffold contained 1% Laponite, the cell proliferation rate in the CCK-8 test was significantly better than that for the other three materials, displaying good cell culture characteristics. The 1% nano-Laponite/PLGA composite scaffold can be used as a suitable urethral repair material, but its performance requires further development and research.
研究领域:
组织工程
·
生物材料
·
生物医学工程
·
细胞生物学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Chen Yu,Xinlai Dou,Linghan Meng,Xiao Feng,Chengcheng Gao,Fenglian Chen,Xiaozhi Tang
Hydrogels, owing to their unique porous structures, hydrophilic properties, and biocompatibility, are being developed as scaffolds for bone grafts. However, the use of toxic initiators or cross-linking agents is a drawback. To overcome this, we developed Laponite®/cross-linked starch/polyvinyl alcohol (PVA) hydrogels prepared by one-step solution mixing. The structure, rheological properties, and biocompatibility of the hydrogels were investigated. Zeta potential , Fourier transform infrared, and X-ray diffraction analyses showed that hydrogen bonding and electrostatic interactions jointly maintained the structure of the cross-linked hydrogel systems. At a Laponite® concentration of 10 %, the hydrogel with a starch/PVA ratio of 2:2 exhibited a uniform porous structure, the highest storage modulus (G'), and the lowest degradation rate. At a starch/PVA ratio of 2:2, the G' increased; however, the degradation rate decreased with the increase in Laponite® content from 5 % to 20 %. These results indicate that the mechanical strength and degradation rate of the hydrogels could be adjusted by altering the starch/PVA ratio and the amount of Laponite®. In vitro cytotoxicity experiments showed that the Laponite®/starch/PVA (LSP) hydrogels were non-toxic to MC3T3-E1 cells. The starch/PVA ratio had no obvious effect on the proliferation of MC3T3-E1 cells, but an increase in Laponite® content significantly promoted cell proliferation . In summary, the results suggest that these LSP hydrogels have great potential for applications in bone tissue engineering.
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Changpeng Li,Changdao Mu,Wei Lin,To Ngai
In recent years, inorganic nanoparticles such as Laponite have frequently been incorporated into polymer matrixes to obtain nanocomposite hydrogels with hierarchical structures, ultrastrong tensibilities, and high transparencies. Despite their unique physical and chemical properties, only a few reports have evaluated Laponite-based nanocomposite hydrogels for biomedical applications. This article presents the synthesis and characterization of a novel, hemocompatible nanocomposite hydrogels by in situ polymerization of acrylamide (AAm) in a mixed suspension containing Laponite and gelatin. The compatibility, structure, thermal stability, and mechanical properties of the resulting NC gels with varied gel compositions were investigated. Our results show that the prepared nanocomposite hydrogels exhibit good thermal stability and mechanical properties. The introduction of a biocompatible polymer, gelatin, into the polymer matrix did not change the transparency and homogeneity of the resulting nanocomposite hydrogels, but it significantly decreased the hydrogel’s pH-responsive properties. More importantly, gelatins that were incorporated into the PAAm network resisted nonspecific protein adsorption, improved the degree of hemolysis, and eventually prolonged the clotting time, indicating that the in vitro hemocompatibility of the resulting nanocomposite hydrogels had been substantially enhanced. Therefore, these nanocomposite hydrogels provide opportunities for potential use in various biomedical applications.
研究领域:
生物医学工程
·
高分子科学
·
纳米材料
·
生物材料
·
水凝胶
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Junhong Li,Faqiang Li,Dinggen Li,Dongming Cheng,Zhiyan Wang,Xueting Liu,Haonan Wang,Xianwei Zeng,Yunhui Huang,Henghui Xu
Solid polymer electrolytes suffer from the low ionic conductivity and poor capability of suppressing lithium dendrites, which have greatly hindered the practical application of solid-state lithium-metal batteries. Here, we report a novel laponite sheet (LS) with a large negatively charged surface as an additive in a solid composite electrolyte (poly(ethylene oxide)-LS) to rearrange the lithium-ion environment and enhance the mechanical strength of the electrolytes (PEO-LS). The strong electrostatic regulation of laponite sheets assists the dissociation of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and constructs multiple transport channels for free lithium ions, achieving a high ionic conductivity of 1.1 × 10–3 S cm–1 at 60 °C. Furthermore, LS facilitates the in situ formation of a LiF-rich interface because of the boosting TFSI– anion concentration, which significantly suppresses lithium dendrites and prevents short circuit. As a result, the assembled LiFePO4|PEO-LS|Li battery demonstrates a long cycle life of over 800 cycles and a high Coulombic efficiency of 99.9% at 1C and 60 °C. When paired with a high-voltage NCM811 cathode, the battery also demonstrates excellent cycling stability and rate capability.
研究领域:
材料科学
·
储能技术
·
电化学
·
聚合物纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Ruirui Guan,Yuhui Su,Shanshan Li,Shuo Yang,Xiaoyun Li,Xiaoying Wang
Standard dressings struggle to conform to irregular wounds, which can easily lead to bacterial infection and impair the healing process. In this study, an injectable, self-healing hydrogel inspired by mussel and oyster adhesion was developed from dihydrocaffeic acid-modified chitosan, oxidized sodium alginate, and Laponite nanosheets. Benefiting from the synergistic reinforcement of dynamic imine bonds and the physical filling of the nanosheets, along with other physical interactions, the hydrogel can be extruded through a syringe and form filaments approximately 0.5 mm in diameter. By enabling slow catechol oxidation while limiting oxygen diffusion in the confined nanospace, Laponite nanoplatelets conferred the hydrogel a wet adhesion strength of 520.2 kPa on porcine skin at 24 h. The hydrogel with Laponite is shown to reduce the survival rates of both S. aureus and E. coli to below 0.35%, indicating effective bactericidal efficacy. In vitro experiments demonstrated that the hydrogel significantly promotes the proliferation, migration, and angiogenesis of HUVECs. Animal experiments confirmed that the hydrogel accelerates epidermal regeneration and collagen deposition, reduces the inflammatory factor TNF-α, and upregulates the expression of angiogenesis-related genes. More importantly, the hydrogel achieved a 96.7% closure rate for S. aureus -infected wounds by day 13.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2025
·
IF 8
Minmin Chen,Linlin Li,Wei Ji,Wensheng Lu,Xiaochao Tang,Suwei Jiang,Hualin Wang
Petroleum-based food packaging causes substantial environmental damage through waste accumulation and microplastic pollution. Therefore, replacing it with biodegradable polymers to extend the shelf life of food products is highly desirable. In this work, a bilayer functional composite with barrier properties and antimicrobial activity was developed for pork preservation. The outer barrier layer of gelatin/laponite (Ge/La) was fabricated by the casting method, while the inner antimicrobial layer of zein/eugenol (ZN/Eu) was prepared through direct electrospinning on Ge/La. The incorporation of La enhanced the thermal stability, mechanical strength, and moisture barrier of the outer layer, while the encapsulation of Eu endowed the inner layer with excellent antioxidant and antimicrobial activities. Furthermore, the Eu release from ZN/Eu fibers was found to follow Fickian diffusion. The bilayer composite of Ge/La@ZN/Eu can prolong pork shelf life by 1 d at 25 °C, demonstrating its great potential in active food packaging
研究领域:
食品科学
·
高分子科学
·
材料工程
·
食品包装技术
·
可降解材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Ling Lin,Zheng Li,Han Gu,Guixia Xiong,Yuanhao Luo,Di Pu,Pingya Luo
With deep and ultra-deep drilling engineering, silane coupling agent KH-570 was used to modify the surface of nanolaponite, and acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), N-vinylpyrrolidone (NVP), and dimethyldiallylammonium chloride (DMDAAC) were selected as monomers. A new fluid loss agent, YH-1, was synthesized by aqueous solution polymerization, and the copolymer was characterized by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, TEM, molecular weight analysis, and thermal stability analysis. The results show that the synthesized product is consistent with the molecular structure design goal. The modified nanolaponite was successfully introduced and relatively uniformly distributed in the filtrate reducer, and the molecular weight distribution was wide. After hot rolling at 240 °C for 16 h, it can still maintain good apparent viscosity, plastic viscosity, and dynamic plastic ratio. When the addition amount is 1.5 wt %, the apparent viscosity can still be maintained at 40 mPa·s, and its high-temperature and high-pressure (HTHP) filtration loss is the lowest compared with the domestic and foreign commercial filter loss reducers. Through particle size distribution, scanning electron microscopy, and zeta potential analysis, the surface of the filter cake formed after adding YH-1 was smooth and shiny, and the hydration film of bentonite particles was thicker. The adsorption group is adsorbed on the surface of bentonite particles, and the hydration group ionizes a large number of negatively charged groups, which increases the thickness of the hydration film of the bentonite particles and the potential of the bentonite particles. The addition of nanolaponite enhances the plugging effect of mud cake, improves the impermeability of mud cake, and enhances the filtration performance.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yanxia Wang,Hao Wang,Xing Su
Nanocomposite hydrogels are supposed to combine the advantages of both a polymer matrix and filler. Without the use of organic additives, the incorporation of high-content inorganic nanofillers along with elevated properties remains a challenge. Accordingly, facilitated by the stepwise salting-out method, we proposed the PVA nanocomposite hydrogels containing multiple nanoscale minerals. Three kinds of nanominerals could reach certain electrostatic equilibrium, which helped to maintain their well-dispersed state even in the PVA matrix with high salinity. Unlike the traditional PVA nanocomposite hydrogels, whose mechanical properties tended to decrease upon the incorporation of inorganic fillers, the incorporation of multiple nanoscale minerals enhanced the mechanical properties including tensile strength and elongation at break. Besides, the unique multiple nanoscale mineral structure endowed our proposed nanocomposite hydrogels with high versatility, which could act as thermal insulators, flame-retardant matter, and respiration detectors. Instead of organic modification, this work innovatively utilizes intrinsic inorganic-to-inorganic interactions for achieving a fine nanocomposite microstructure in a polymer matrix. Our proposed nanocomposite hydrogels address potential applications for stimulus-responsive devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Hafezeh Nabipour,Xin Wang,Lei Song,Yuan Hu
Flexible polyurethane (FPU) foam as a primary softening material is utilized in soft furnishings of upholstered mattresses and furniture. High flammability of this soft furnishing material usually leads to residential fires, causing severe fatalities. In the present study, we proposed a bio-based and environmentally-friendly flame retardant multilayered coating consisted of laponite (LAP), branched polyethyleneimine (BPEI), sodium alginate (SA) and chitosan (CH) that was deposited onto FPU foams to enhance their fire safety property. Based on the thermogravimetric analysis results, it was indicated that after the deposition of LAP, the thermal stability of the coated FPU foams increased sharply. Foam treated with 9 quad layers (QL) of BPEI/SA/CH/LAP multilayered coating showed self-extinguishing behavior in an open flame burning test. Furthermore, the values of peak heat release rate (PHRR), total heat release (THR) and smoke release rate (SPR) of the coated FPU foams reduced considerably in comparison to those of the pure FPU foam. Specifically, 9 QLs of BPEI/SA/CH/LAP declined the PHRR and the THR by 74% and 42.6%, respectively. The coated FPU foam also showed self-extinguishing and anti-dripping features in an open flame testing. Therefore, it can be stated that LAP-based coating has incredible benefits in decreasing fire risk of FPU foams. Moreover, the flame retardant mechanism of this LAP-based multilayered coating was proposed. The LAP-based coating functioned as a physical insulating barrier that successfully retarded the permeation of the flammable volatiles, heat and oxygen. Hence, the significant decrease in PHRR with the self-extinguishing behavior was achieved, implying promising potential of this LAP-based multilayered coating to enhance the fire safety of FPU foams.
研究领域:
材料科学
·
消防安全
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）