Science China-Technological Sciences
·
2022
·Vol. 65
·期 10
·2304-2316
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IF 3.903
Dai Nan,Feng Li,Zhao Li,Song Dan,Dai XingJian,Liu XiaoYing,Zhang YuXin
A one-step hydrothermal method was used to synthesize two-dimensional layered Laponite nanosheets (Laponite@diatomite) in situ on the three-dimensional biological template diatomite. The cationic dye removal ability of Laponite@diatomite with different diatomite content was studied. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transformed-infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and N 2 adsorption-desorption technology were used to characterize synthetic materials. The effects of pH, initial concentration, dynamics, and thermodynamics behavior on the adsorption performance were further studied. La@D-0.1 had the highest adsorption efficiency, and the adsorption rate of methylene blue (MB) solution (450 mg L −1 ) reached 76.7% in the initial 5 min. At the time of adsorption equilibrium (1 h), methylene blue adsorption rate reached 86.4%. The adsorption behavior of La@D-0.1 on MB was characterized by Langumuir isotherm and with better fitting to the quasi-second-order kinetic model curve. By calculating the adsorption process’s thermodynamic parameters, we were able to illustrate that the adsorption process was exothermic. This work provides a novel idea for the synthesis of an economical and ideal, cationic dye nano-adsorbent and provides a potential application for the purification of actual dye wastewater.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Environmental Science-Nano
·
2021
·Vol. 9
·期 2
·523-531
·
IF 8.131
Jialin Chi,Chonghao Jia,Wenjun Zhang,Christine V. Putnis,Lijun Wang
Organo–clay complexes could be adsorbed and subsequently occluded into soil mineral matrices under local supersaturated solution conditions, leading to inaccessibility of microorganisms and their extracellular enzymes, which plays an important contribution to stabilization of soil organic matter (SOM) and affects their biogeochemical cycle. However, the underlying molecular mechanisms remain poorly understood. Here we apply Raman spectroscopy to analyze the LAPONITE®-sugar (monosaccharide glucose (Glu) and 5/20 kDa dextran (Dex-5/20) polysaccharides) interactions and use in situ atomic force microscopy (AFM) to observe their occlusion processes within calcite. As shown by Raman spectra, the LAPONITE®-sugar complexes form with the mix of sugars and LAPONITE®, and the degree of elution is mediated by the molecular weight of sugars and more Glu would be eluted compared with Dex-5 and Dex-20. Then the LAPONITE®-sugar complexes could be occluded within calcite observed by AFM, and the occlusion of the LAPONITE®-sugar complexes within calcite hillocks are influenced by molecular weight with the trend of Dex-20 > Dex-5 > Glu. The binding force between sugars and calcite (104) surfaces are measured by AFM-based dynamic force spectroscopy (DFS) to record the molecular-scale interactions, and high-molecular weight sugar such as Dex-20 exhibits strongest binds with calcite surfaces as shown by DFS data. These in situ nanoscale observations and single-molecule determinations in a model system may provide insights into the clay-SOM-calcite fixation mechanisms by sugar in alkaline soils, with potential implications for global carbon cycling.
研究领域:
土壤学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shaodong Bai,Jianjiang Mao,Fengshou Yu,Fei Cheng
Solid-state electrolytes (SSEs) can replace the diaphragm and electrolyte in the traditional battery to solve safety perils such as electrolyte leakage and combustion, while their practical application is greatly hindered by their low ionic conductivity and poor ability to inhibit lithium dendrites. Herein, a laponite (LAP)/zeolitic imidazolate framework-8 (ZIF-8) hybrid material modified polyvinylidene fluoride (PVDF)-based composite polymer electrolytes (CPE) is reported. The in-situ modification of ZIF-8 induced by electrostatic interactions between LAP layers not only improves the dispersion of LAP, but also acts as an external bridge through hydrogen bonding with PVDF to construct a stable conductive network. The extended and compatible polymer-nanofiller hybrid interface enables continuous ion migration paths and effectively reduce the crystallinity of PVDF. Moreover, the Lewis acid site and high porosity of ZIF-8 can not only promote the dissociation of lithium bis (trifluoromethanesulphonyl) imide (LiTFSI), but also limit the movement of TFSI − , further improving the ionic conductivity. Benefiting from the synergistic enhancement effect of hybrid interface, the obtained CPE demonstrated an excellent ionic conductivity of 6.77 × 10 −4 S cm −1 at room temperature and a satisfactory ion transference number of 0.60 together with superior electrochemical window of 5.3 V and good mechanical strength. The assembled Li metal battery shows a high capacity retention rate is 95 % after 150 cycles at 1C, indicating a significant inhibitory effect on lithium dendrites.
研究领域:
材料科学
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能源存储
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Siyuan Diao,Lili Meng,Christian Mark Pelicano,Jiajia Huang,Zhihong Tian,Feili Lai,Tianxi Liu,Shaokui Cao
Photothermal responsive hydrogels are widely used in bionic soft actuators due to their remote-controlled capabilities and flexibility. However, their weak mechanical properties and limited responsiveness hinder their potential applications. To overcome this, we developed an innovative laponite/MXene/PNIPAm (LxMyPN) nanocomposite hydrogel that is mechanically robust and exhibits excellent photothermally responsive properties based on abundant hydrogen bonds. Notably, laponite clay is used as a co-cross-linking agent to improve the mechanical properties of LxMyPN hydrogel, while MXene nanosheets are added to promote the photothermal responsiveness. The resulting L3M0.4PN nanocomposite hydrogel exhibits enhanced mechanical properties, with a compressive strength of 0.201 MPa, a tensile strength of 90 kPa, and a fracture toughness of 27.25 kJ m–2. In addition, the L3M0.4PN hydrogel displays a deswelling ratio of 73.6% within 60 s and experiences an excellent volume shrinkage of 82.4% under light irradiation. Furthermore, hydrogel actuators with fast response behaviors are constructed and employed as grippers capable of grasping and releasing target objects. Overall, this high-strength and fast-responsive hydrogel actuator is beneficial to paving the way for remote controlled soft robots.
研究领域:
材料科学
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生物仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Guodong Li,Dehai Yu,Zhaoping Song,Huili Wang,Wenxia Liu
It is a significant challenge to reduce the sheet formation time and simultaneously sustain high transparency and good formation of nanostructured paper made of cellulose fibrils. In this study, a new strategy was developed for expediting the filtration but avoiding the flocculation of cellulose fibrils by using polyvinylpyrrolidone (PVP) and Laponite as dispersants to reduce the viscosity of the cellulose fibril aqueous dispersion. By adding 0.5 % PVP and 0.2 % Laponite to the cellulose fibril dispersion, the sheet formation time was reduced from 135.3–53.0 min, and the transmittance of the nanostructured paper was increased from 82.8%–89.8 %. The addition of PVP and Laponite significantly reduced the roughness and density but improved the tensile strength of the nanostructured paper. This study provides an approach for simultaneously improving the drainability, transparency, tensile strength, and smoothness of cellulose nanostructured paper made of cellulose fibrils.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Yun Tan,Shimei Xu,Ronglan Wu,Juan Du,Jilong Sang,Jide Wang
A gradient Laponite (Lap)-crosslinked nanocomposite (NC) hydrogel was fabricated by a facile electrophoresis method based on colloidal property of Lap, as well as interaction between Lap and thermo-responsive monomers . TGA , FTIR, SEM and TEM were used to characterize the gradient structure. The gradient NC hydrogel exhibited both gradient distribution of Lap and thermo-responsive polymers under the induction of direct current electric field (DC-EF). The gradient NC hydrogel showed anisotropic mechanical properties and gradient thermo-response along the direction of DC-EF. The mechanical strength of the gradient NC hydrogel increased by 38% compared with isotropic NC hydrogel. An increase in Lap content would improve the mechanical property and extend the strength range in different locations of the gradient hydrogel. Meanwhile, the compressive strength of the gradient NC hydrogels can also be adjusted in the range of 117–1774 kPa by changing the concentration of Lap. The work enabled the gradient NC hydrogels to apply in the field of tissue engineering and provided a new insight into development of novel bionic materials.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Bo Gao,Hairong Yu,Jingya Wen,Hongju Zeng,Ting Liang,Fang Zuo,Changjing Cheng
Dye pollution has become a serious threat to environment and human health. Although versatile hydrogels have attracted intensive attentions due to their outstanding adsorption properties, the ultrahigh adsorption capacity and mechanical property are still two critical challenges for the practical applications. Herein, a super-adsorbent poly(acrylic acid)/laponite (PAAc/Lap) nanocomposite hydrogel with ultrahigh mechanical property and adsorption capacity of methylene blue (MB) is prepared by incorporating physical cross-linking with sparse chemical cross-linking. The hydrogel possesses porous 3D network structures and a fairly high water penetration with 1360 times of swelling ratio, which can allow the internal adsorption sites to be fully exposed and facilitate the adsorption. The adsorption capacity of MB can reach up to 3846 mg/g, which is almost the first time that a PAAc-based adsorbent could display superior adsorption capacity of more than 3800 mg/g towards MB. Important factors affecting the adsorption are also investigated, and the adsorption behavior is well fitted by the pseudo-second-order model and Langmuir isotherm model. More importantly, the appropriate physical cross-linking and sparse chemical cross-linking in the polymeric network endows hydrogel with superior mechanical properties. The tensile stress and strain are as high as 1.18 MPa and 2192%, which can facilitate the expansive applications and practical treatment. Mechanism analyses illustrate that the electrostatic interactions and cation-exchange between the functional groups of hydrogel and MB molecules contribute to the extraordinary adsorption ability. The proposed PAAc/Lap hydrogel with ultrahigh adsorption capacity and mechanical property is highly promising as an efficient super adsorbent for water treatment .
研究领域:
环境科学
·
材料科学
✓ 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
AAPS PHARMSCITECH
·
2019
·Vol. 21
·期 1
·1-10
·
IF 2.608
Yang Yue,Li Jinyu,Chen Fen,Qiao Sen,Li Yunjian,Pan Weisan
As a synthetic clay material, laponite RDS (LR) was investigated as an effective drug carrier as a result of the special nanodisk structure together with the negative-charged surface to achieve enhanced cellular uptake and targeted delivery. In this research work, the synthesized oligomeric hyaluronic acid-aminophenylboronic acid (oHA-APBA) was entangled onto LR nanodisks to fabricate a valid targeted platform for breast cancer therapy. Briefly, through the formation of amide bonds, 3-APBA was connected to the chain of oHA with a substituted ratio of 4.0 ± 0.2% to synthesize oHA-APBA copolymer. Thereafter, doxorubicin (DOX) was inserted into the interlayer space of LR by the way of the ion exchange process, followed by an assembly with oHA-APBA as a targeted protection layer. The satisfactory drug encapsulation efficiency (> 80%) and narrow size distribution were achieved. The in vitro drug release study demonstrated the release of DOX from DOX@LR/oHA-APBA was sustained and acid dependent. In addition, after fitting the drug cumulative release of DOX@LR/oHA-APBA under different pH conditions with several kinetic models, it was identified that drug release from DOX@LR/oHA-APBA nanohybrids at pH 5.0 was mainly dependent on both diffusion and ion exchange effects. However, under the condition of pH 7.4, the drug was most efficiently released by diffusion effect. Importantly, DOX@LR/oHA-APBA showed remarkable cellular uptake and intracellular drug distribution in MCF-7 cells, which were consistent with inhibitory ability against MCF-7 cells. Hence, the high DOX loading capacity and enhanced cellular tracking can enlighten LR/oHA-APBA as an effective drug delivery carrier for breast cancer therapy.
研究领域:
药剂学
·
肿瘤学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Ying Yang,Zhi Liu,Dayong Wu,Man Wu,Ye Tian,Zhongwei Niu,Yong Huang
We investigated the effect of amphiphilic Laponite nano-discs, which were edge-modified by hydrophobic chains, on the properties of Pickering emulsions and Pickering emulsions polymerization. Comparing to unmodified Laponites, these amphiphilic nano-discs can greatly reduce the surface tension, resulting in very stable Pickering emulsions. These particles uniquely combine the Pickering effect with amphiphilic properties similar to the surfactant . Taking advantage of these amphiphilic Pickering emulsifiers , miniemulsion polymerization of styrene was performed. Homogeneous polystyrene nanoparticles with size around 150 nm could thus be prepared.
研究领域:
材料科学
·
化学工程
✓ 已验证
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
✓ 已验证
产品关联
DOI
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
危险品化学品经营许可证（带存储）