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.
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LANGMUIR
·
2024
·
IF 3.7
Nan Dai,Xinyi Liu,Lei Yang,Xi Huang,Dan Song,Song Wang,Kai Zhang,Xiaoying Liu,Wenxin Dong,Yuxin Zhang
This work aims to enhance the adsorption performance of Laponite @diatomite for organic pollutants by modifying it with cetyltrimethylammonium bromide (CTAB). The microstructure and morphology of the CTAB-modified Laponite @diatomite material were characterized using SEM, XRD, FTIR, BET, and TG. Furthermore, the influences of key parameters, containing pH, adsorbent dosage, reaction time, and reaction temperature, on the adsorption process were investigated. The kinetics, thermodynamics, and isotherm models of the adsorption process were analyzed. Finally, potential adsorption mechanisms were given based on the characterization. The research findings indicate that CTAB-La@D exhibits good adsorption performance toward Congo red (CR) over a broad pH range. The maximum adsorption capacity of CR was 451.1 mg/g under the optimum conditions (dosage = 10 mg, contact time = 240 min, initial CR concentration = 100 mg/L, temperature = 25 °C, and pH = 7). The adsorption process conformed to the pseudo-second-order kinetic model, and the adsorption isotherms indicated that the adsorption process of CR was more in line with the Langmuir model, and it was physical adsorption. Thermodynamic analysis illustrates that the adsorption process is exothermic and spontaneous. Additionally, the mechanisms of electrostatic adsorption and hydrophobic effect adsorption of CR were investigated through XPS and FTIR analysis. This work provides an effective pathway for designing high-performance adsorbents for the removal of organic dye, and the synthesized materials hold great capability for practical utilization in the treatment of wastewater.
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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.
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Advanced Membranes
·
2025
·
IF 9.5
Zhijiang Sun,Xianya Wu,Yumeng Wang,Yu Jiang,Tao Yao,Shengtao Niu,Jianzhou Niu,Dahui Wang,Zehua Yin,Fen Ran
Many high-performance ultrafiltration membranes have been developed to address pollutant removal in complex water environments. However, the permeability-selectivity trade-off and inherent instability issues remain unresolved. In this study, a dense ultrafiltration membrane modified with laponite nanosheets is fabricated for selective separation and purification. The laponite nanosheets exhibit excellent compatibility with the polyethersulfone matrix, owing to their well-defined dimensions, distinctive physicochemical properties, and the dispersing role of polyvinylpyrrolidone, resulting in a membrane with synergistic performance characteristics. The modified membrane demonstrates a high pure water flux (106.3 L m -2 h -1 ), near-complete rejection of Congo red (>99.9 %), and high rejection rate of Methylene blue (89.8 %). Within a wider pressure range (0.1-3.0 MPa), the permeation flux maintains a linear relationship with increasing pressure, while the rejection rate for Congo red is nearly 100 %. In addition, under a high pressure of 2.0 MPa, laponite nanosheet-modified polyethersulfone membrane exhibits high stability and good separation performance under high-pressure conditions. These attributes significantly enhance separation precision and operational reliability in dye wastewater systems, indicating strong potential for practical application.
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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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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
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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
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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.
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Soft Matter
·
2020
·Vol. 16
·期 36
·8394-8399
·
IF 3.14
Xinyu Liu,Xiaofeng Niu,Zhinan Fu,Liqun Liu,Shengyu Bai,Jie Wang,Li Li,Yiming Wang,Xuhong Guo
LAPONITE® sheets have been widely used for the preparation of tough nanocomposite hydrogels for enticing applications; however, their inferior dispersion in aqueous media resulting from electrostatic interactions between the nanosheets remarkably limits further improvements in the mechanical performances of the nanocomposite hydrogels. Here, we show a simple approach to dramatically accelerate the dispersion of LAPONITE® sheets in water, and in turn further improve the mechanical performances of the resulting nanocomposite hydrogels. Upon addition of poly(acrylic acid) (PAA), the electrostatic interactions between the LAPONITE® sheets were effectively reduced due to the adsorption of PAA onto the positively charged edges of the LAPONITE® sheets, thereby accelerating the dispersion of the LAPONITE® sheets in water. On this basis, a series of polyacrylamide (PAAm) hydrogels with a high content of LAPONITE® sheets was prepared, showing excellent tensile strength, stretchability, and anti-fatigue properties. This study will be beneficial for the preparation of LAPONITE®-based nanocomposite hydrogels bearing excellent mechanical properties for new applications.
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高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2020
·Vol. 2020
·期 22
·2170-2176
·
IF 2.529
Xueshuai Chen,Rongli Jiang,Zihan Zhou,Xingwen Wang
Graphical SAPO-34 zeolite was successfully synthesized from laponite as the single Si source. Laponite itself contains Li and Mg atoms, which were subsequently introduced into the structure of SAPO-34 via depolymerization-reorganization of laponite. Metal incorporation can reduce the amount of stronger acid sites and enhance the catalytic performance in the MTO reaction. In this work, SAPO-34 zeolite with high catalytic activity was successfully synthesized by hydrothermal method from laponite as the single Si source. Compared with the traditional method of synthesizing zeolites from clay, the laponite after swelling can be directly used in the synthesis process of zeolite. The crystallization behavior of SAPO-34 synthesized from laponite was investigated by XRD, FTIR, N 2 adsorption–desorption, SEM-EDX, ICP-MS, and DR-UV/Vis. The process can be summarized as follows: the Si and Mg elements were produced by the depolymerization of laponite, then the primary building units of SAPO-34 zeolite were formed under hydrothermal conditions; finally, the crystal nucleus began to form, and crystallization was triggered. Compared with the conventional SAPO-34 synthesized from TEOS, the SAPO-34 synthesized from laponite exhibited higher selectivity to light olefins and longer lifetime, which can be attributed to the suitable strength of acidity. This work points to a straightforward route to the synthesis of SAPO-34 from laponite.
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Ziyan Wang,Jingyao Li,Yanbin Sun,Jiangtao Peng,Jian Wang,Yizhan Hao,Wenqing Li,Peiping Zhang,Weikun Ning,Shiding Miao
The fluorescence resonance energy transfer (FRET) between donor-acceptor molecules of fluorescein (FL) and rhodamine B (RhB) was enhanced by clay sheets of laponite. This enhancement was implemented by the Langmuir-Blodgett (LB) technique. Hybrid films were prepared by incorporating elementary clay sheets into dye molecules (FL and RhB for different molar ratios) at the air/water interface. The spectroscopic measurements (UV–Vis absorption and photoluminescence) of these mixture systems (FL, RhB and clay mineral) were analyzed both in colloidal dispersion and LB films . A high efficiency (92%) of FRET from FL to RhB was achieved with presence of laponite. Characterizations such as surface pressure versus area (π-A) isotherms, atomic force microscopy (AFM) and contact angle measurements were used to confirm the successful incorporation of clay sheets in hybrid films with loaded dye molecules. The clay incorporation were indicated to shorten the distance between donor and acceptor chromophores (Förster radius), which was realized by the tightly bounded dye molecules on clay sheets and self-assembly of dye molecule pairs.
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Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Ling Zheng,Bingjie Zhou,Xiaofeng Qiu,Xin Xu,Gang Li,Wayne Y.W. Lee,Jia Jiang,Yulin Li
The multidrug resistance of tumor cells has been creating a high requirement on development of nanocarriers for administration of different drugs, among which their drug loading capacity and controllable release properties are the key factors to overcome tumor drug resistance. This study aims to use a kind of bioactive 2D nanoplatelets (25 nm in diameter and 0.92 nm in thickness) to load different anticancer drugs (doxorubicin and methotrexate) via a step-by-step assembly, where variation of each drug amount can be used for adjustment of the sizes of the resulting nanocomplexes. The dual-drug loaded nanosystems allow for a sequential release of the loaded drugs. Furthermore, drug release rate can be accelerated under both acidic pathological triggers of tumors and/or by heating treatment, resulting in a synergistic anticancer bioactivity. The drug-mediated formation of nanocarriers may enlighten a design of novel nanoplatform for co-delivery of therapeutic agents, beyond anticancer drugs, in a combinative way for drug delivery applications.
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