Hierarchical Nanocomposites Research Articles

One-pot solvothermal synthesis of fern leaf-like α-Fe2O3@C/graphene from ferrocene with enhanced lithium and sodium storage properties

Rational design and efficient synthesis method for electrode materials with improved functional morphologies are highly sought after in the development of rechargeable batteries. Herein, hierarchical fern leaf-like nanocomposites of α-Fe2O3@C connected by reduced graphene oxide (rGO), to form α-Fe2O3@C/rGO, have been prepared through a one-pot self-templated solvothermal method from ferrocene. A reasonable self-assembly process of the unique nanostructure is also proposed. During the in-situ formation, rGO content has a direct impact on the size of the fern leaf-like architectures, and also improves the electronic conductivity between adjacent fern leaf-like architectures. When used as anode materials for lithium-ion batteries, α-Fe2O3@C/rGO nanocomposite exhibits excellent cycling performance at 200mAg−1, maintaining a discharge capacity of 971mAhg−1 after 100cycles. Furthermore, when used as anode materials for sodium-ion batteries, it exhibits an encouragingly high reversible capacity of 720mAhg−1 at 50mAg−1 during the 2nd cycle. These results suggest the unique nanocomposite structure holds great promise for energy storage applications.

Novel I–V Disposable Urea Biosensor Based on a Dip‐coated Hierarchical Magnetic Nanocomposite (Fe3O4@SiO2@NH2) on SnO2:F Layer

Silicon oxide was initially loaded on a Fe3O4 magnetic nanoparticle substrate (Fe3O4@SiO2) and then functionalized with ─NH2 group (Fe3O4@SiO2@NH2) to construct a novel hierarchical magnetic nanocomposite. A sensitive urea biosensor medium involving a dip‐coated hierarchical magnetic nanocomposite on F‐doped SnO2 conducting glass was designed (Fe3O4@SiO2@NH2/SnO2:F) to achieve an excellent platform for urease (Urs) enzyme immobilization via covalent linking to the exposed NH2 groups through glutaraldehyde (Urs/Fe3O4@SiO2@NH2/SnO2:F). The hierarchical magnetic nanocomposite selection criteria were based on enhancement of urea biosensing by Urs immobilization via covalent linking to the exposed NH2 groups, while the SnO2:F selection as substrate was based on its ability to afford high electronic density to the biosensor surface as an electrostatic repulsion layer for the anionic interferents in the biological environment. FE‐SEM, TEM, FTIR, CV, EIS, and I–V techniques established the morphology of the modified electrode's surface and electrochemical behavior of urea on the fabricated Urs/Fe3O4@SiO2@NH2/SnO2:F biosensor. The sensing mechanism can be clarified on the basis of the two reactions, namely (1) catalytic reaction and (2) oxidation or reduction of metal oxides, same as in the case of solid‐state gas sensors. The I–V results display high sensitivity for urea detection of within 5–210 mg/dL and a limit of detection of 3 mg/dL.

Directed Growth of a Bimetallic MOF Membrane and the Derived NiCo Alloy@C/NixCo1‐xO/Ni Foam Composite as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

AbstractHierarchically structured bimetallic NiCo‐MOF/LDH/Ni foam (NiCo‐MOF/LDH/NF; MOF=metal−organic framework, LDH=layered double hydroxides) composites were successfully fabricated by means of the in situ growth of NiCo‐MOF on the NiCo LDH buffer‐layer‐modified NF surface. After carbonization, the derived NiCo alloy@C/NixCo1‐xO/NF hierarchical nanocomposite showed excellent electrocatalytic activity with respect to the oxygen evolution reaction (OER); specifically, it exhibited a very low overpotential of 300 mV at a current density of 100 mA cm−2. The outstanding OER activity of the composite may be attributed to the open structure of the nanocomposite, the formation of the highly dispersed CoNi alloy, and the synergistic interaction between CoNi@C and NixCo1‐xO. This work introduces a new strategy for constructing advanced hierarchically structured nanocomposites for diverse applications.

High-stress study of bioinspired multifunctional PEDOT:PSS/nanoclay nanocomposites using AFM, SEM and numerical simulation.

Bioinspired design has been central in the development of hierarchical nanocomposites. Particularly, the nacre-mimetic brick-and-mortar structure has shown excellent mechanical properties, as well as gas-barrier properties and optical transparency. Along with these intrinsic properties, the layered structure has also been utilized in sensing devices. Here we extend the multifunctionality of nacre-mimetics by designing an optically transparent and electron conductive coating based on PEDOT:PSS and nanoclays Laponite RD and Cloisite Na+. We carry out extensive characterization of the nanocomposite using transmittance spectra (transparency), conductive atomic force microscopy (conductivity), contact-resonance force microscopy (mechanical properties), and SEM combined with a variety of stress-strain AFM experiments and AFM numerical simulations (internal structure). We further study the nanoclay’s response to the application of pressure with multifrequency AFM and conductive AFM, whereby increases and decreases in conductivity can occur for the Laponite RD composites. We offer a possible mechanism to explain the changes in conductivity by modeling the coating as a 1-dimensional multibarrier potential for electron transport, and show that conductivity can change when the separation between the barriers changes under the application of pressure, and that the direction of the change depends on the energy of the electrons. We did not observe changes in conductivity under the application of pressure with AFM for the Cloisite Na+ nanocomposite, which has a large platelet size compared with the AFM probe diameter. No pressure-induced changes in conductivity were observed in the clay-free polymer either.

3D hierarchical Ni2 +/Mn2 +/Al3 + layered triple hydroxide @ nitrogen-doped graphene wrapped hybrids on nickel foam for supercapacitor applications

Nickel Foam as a substrate for morphology controllable synthesis of hierarchical nanocomposites with three-dimensional architecture is gaining substantial rank as effective energy materials for high-performance energy conservation and energy conversion devices. Herein, we report our findings in fabrication of 3D hierarchical, Ni2+/Mn2+/Al3+- layered triple hydroxide @ nitrogen-doped graphene wrapped hybrid on a nickel foam (marked as NMA-L@NG-NF) electrode, via a two-step hydrothermal method: primarily in situ hydrothermal growth of NiMnAl-LTH nanosheets over the surface of nickel foam, followed by secondary hydrothermal wrapping of NG graphene over the surface of NiMnAl-L@NF. The phase purity, structure, morphology and functionalities of the synthesized NMA-L@NG-NF hybrid electrodes were characterized comprehensively by XRD, FT-IR, Raman, XPS, EDS and SEM techniques. The results show that the obtained structure (NMA-L@NG-NF) possessed hierarchical flower-like configuration, which were self-assembled from LTH nanosheets and grafted successfully onto the framework of NF substrate during the hydrothermal process. Moreover, when tested as a binder-free electrode in a half cell three-electrode configuration, the NMA-L@NG-NF hybrid display significantly high specific capacity (452mAh/g at 5A/g), the excellent rate capability (75.8% at 20 A/g), the excellent cycling stability (91.4% of its initial capacity was retains at a current density of 10 A/g after 5000cycles, with ∼100% Coulombic efficiency) and very low RCT value (0.34Ω before and 0.62Ω after 5000 charge discharge cycle from impedance measurements). It could be anticipated that the synthesized NMA-L@NG-NF hybrid is thus a highly promising electrode by virtue of their outstanding applications in high-performance energy storage and energy conversion devices.

Enhancement of the Electrical Conductivity and Interlaminar Shear Strength of CNT/GFRP Hierarchical Composite Using an Electrophoretic Deposition Technique.

In this work, an electrophoretic deposition (EPD) technique has been used for deposition of carbon nanotubes (CNTs) on the surface of glass fiber textures (GTs) to increase the volume conductivity and the interlaminar shear strength (ILSS) of CNT/glass fiber-reinforced polymers (GFRPs) composites. Comprehensive experimental studies have been conducted to establish the influence of electric field strength, CNT concentration in EPD suspension, surface quality of GTs, and process duration on the quality of deposited CNT layers. CNT deposition increased remarkably when the surface of glass fibers was treated with coupling agents. Deposition of CNTs was optimized by measuring CNT’s deposition mass and process current density diagrams. The effect of optimum field strength on CNT deposition mass is around 8.5 times, and the effect of optimum suspension concentration on deposition rate is around 5.5 times. In the optimum experimental setting, the current density values of EPD were bounded between 0.5 and 1 mA/cm2. Based on the cumulative deposition diagram, it was found that the first three minutes of EPD is the effective deposition time. Applying optimized EPD in composite fabrication of treated GTs caused a drastic improvement on the order of 108 times in the volume conductivity of the nanocomposite laminate in comparison with simple GTs specimens. Optimized CNT deposition also enhanced the ILSS of hierarchical nanocomposites by 42%.

Synthesis of g-C3N4 nanosheets decorated flower-like tin oxide composites and their improved ethanol gas sensing properties

The g-C3N4 nanosheets decorated three-dimensional (3D) hierarchical flower-like SnO2 nanocomposites were synthesized via a facile hydrothermal method by using the g-C3N4 and SnCl2·2H2O as the precursors. The structure and morphology of the as-synthesized samples were characterized by the X-ray powder diffraction (XRD), electron microscopy (FESEM and TEM), N2 sorption, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectrometer (FT-IR) techniques. It is supposed that g-C3N4 nanosheets act as a template in the hydrothermal process, accelerating the preferential growth of SnO2 nanocrystals and preventing the agglomeration of the SnO2 nanoparticles. The gas sensing performances of the as-synthesized samples to ethanol vapor were tested, and the response of the sensor based on 3 wt.% g-C3N4 decorated SnO2 composite to 500 ppm ethanol vapor was 360 at 300 °C, which was much higher than that of pure flower-like SnO2 based sensor. The improved ethanol gas sensing property is proposed to relate to the good conductivity of g-C3N4, high specific surface area and interactions between g-C3N4 and SnO2.

Facile fabrication of hierarchical diamond-based AuNPs-modified nanocomposites via layer-by-layer assembly with enhanced catalytic capacities

Abstract The diamond-based hierarchical AuNPs-modified nanocomposites materials were prepared via the synthesis of diamond@graphite building block and polyallylamine hydrochloride (PAH)/polyacrylic acid (PAA) layer-by-layer (LbL) assembled strategy. And the modified gold nanoparticles were carried out by the reduction of aqueous HAuCl4 solution using the reductant NaBH4. The obtained layer-by-layer nanocomposites demonstrate obvious advantages such as high specific surface area, pore diameter and pore volume, providing a higher chance of gold nanoparticles accessible to the reactants. Thus the core–shell nanostructures from of LbL-assembled and diamond-based composite materials are beneficial to improve the catalytic capacity of gold nanoparticles and separation rate from the reactants. In order to testify the enhancement of hierarchical diamond-based AuNPs-modified nanocomposites catalytic activity and utility, the catalytic experiments of 4-nitrophenol solution were well accomplished. The prepared nanocomposites exhibited high activity and demonstrated high recyclability without less weight of gold nanoparticles after eight runs of catalysis reduction of 4-nitrophenolm showing potential application in composite catalytic materials.

Monodispersed FeCO3 nanorods anchored on reduced graphene oxide as mesoporous composite anode for high-performance lithium-ion batteries

The development of advanced 1D/2D hierarchical nanocomposites for high-performance lithium-ion batteries is important and promising. Herein, monodispersed FeCO3 nanorods anchored on reduced graphene oxide (RGO) are prepared via a facile and efficient one-pot hydrothermal synthesis. The influence of RGO content on the morphology and electrochemical performances of the mesoporous FeCO3/reduced graphene oxide (FeCO3/RGO) composites are systematically studied. Optimized FeCO3/RGO composite shows good cycling stability. It delivers an initial discharge capacity of 1449 mAh·g−1 at the current density of 200 mA g−1 and maintained a capacity of 789 mAh·g−1 after 80 cycles. A moderate amount of RGO sheets can not only provide more conductive channels to improve the electrode conductivity, but also effectively buffer the large volume variation of FeCO3 during continuous charge/discharge process. The combination of FeCO3 nanorods with RGOs synergistically contribute to enhanced capacity and durability of the composite anode. It demonstrates that RGO anchored-FeCO3 nanorods should be an attractive candidate as anode material for high-performance lithium-ion batteries.

Hierarchical and hybrid RGO/ZIF-8 nanocomposite as electrochemical sensor for ultrasensitive determination of dopamine

A hierarchical and hybrid nanocomposite of reduced graphene oxide/zeolitic imidazolate framework-8 (RGO/ZIF-8) has been successfully fabricated by the RGO as template for the in situ growth of ZIF-8. The morphology and structure of the resulted RGO/ZIF-8 nanocomposite were characterized by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was demonstrated that ZIF-8 nanoparticles anchored and grew well on the surfaces of RGO. The electrocatalytic activity of the RGO/ZIF-8 towards the dopamine (DA) was investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results demonstrated the fabricated RGO/ZIF-8 sensor exhibited high sensitivity for the determination of DA, owing to the synergistic effect from highly electrical conductivity of RGO and porosity of ZIF-8. Under the optimal conditions, the linear response range for DA was from 1.0×10−7 to 1.0×10−4molL−1 and the detection limit of DA was estimated to be as low as 3×10−8molL−1. Moreover, the prepared electrochemical sensor also showed excellent selectivity for DA detection in the presence of ascorbic acid (AA) and prospective results in real samples detection.

Hierarchical SnO2-Graphite Nanocomposite Anode for Lithium-Ion Batteries through High Energy Mechanical Activation

Development of novel electrode materials with unique architectural designs is necessary to attain high power and energy density lithium-ion batteries (LIBs). SnO2, with high theoretical capacity of 1494mAhg−1, is a promising candidate anode material, which has been explored with various strategies, such as dimensional reduction, morphological modifications and composite formation. Unfortunately, most of the SnO2-based electrodes are prepared by using complex chemical synthesis methods, which are not feasible to scale up for practical applications. In addition, concomitant irrecoverable initial capacity loss and consequently poor initial Coulombic efficiency still persistently plagued these SnO2-based anodes. To overcome hitherto conceived irreversible formation of Li2O by conversion reaction, to fully harness its theoretical capacity, this work demonstrates that a hierarchical structured SnO2-C nanocomposite with 68.5% initial Coulombic efficiency and reversible capacity of 725mAhg−1 can be derived from the mixtures of SnO2 and graphite, by using low cost industrial compatible high energy ball milling activation.

A laser irradiation synthesis of strongly-coupled VOx-reduced graphene oxide composites as enhanced performance supercapacitor electrodes

A unique technique is present to synthesize three dimensional hierarchical vanadium oxides/reduced graphene oxide composites (denoted as 3D VOx/rGO composites) by laser irradiation over the mixture of V2O5 nanobelts and GO nanosheets. Electron microscopy and X-ray photoelectron spectroscopy (XPS) examinations reveal that polydisperse V2O5/VO2 heterostructured nanoparticles form strong coupling with rGO. As a result, a specific capacitance of 252 F g−1 is achieved for 3D VOx/rGO composites when used as supercapacitor electrodes, and the capacitance can retain 92% of the initial specific capacitance even after 10000 cycles at a current density of 100 A g−1. The improvement of supercapacitor performance is achieved by significantly increase on specific surface area of 3D VOx/rGO composites, which favors the easy access of the electrolyte and provides large electroactive surface, and strong VOC bond between VOx nanoparticles and rGO, which benefits the effective charge transfer. We believe that the facile laser irradiation approach represents a major step not only for the simple and efficient fabrication of high performance electrodes but also in the practical application of laser processing to synthesize other functional hierarchical nanocomposites.

Hierarchical hybrid MnO/Pd-Fe3O4 and CoO/Pd-Fe3O4 nanocomposites as efficient catalysts for hydroboration of styrene

We report a one-pot synthesis of hierarchical MnO/Pd-Fe3O4 and CoO/Pd-Fe3O4 nanocomposites containing scrolled multilayered nanosheets by controlled thermal decomposition of Fe(CO)5 and reduction of metal precursors [Pd(OAc)2]. During the synthetic process, particles of amorphous MnO and CoO are immobilized on the Pd-Fe3O4 support. These hierarchical nanocomposites follow a stepwise growth mechanism, initially forming Pd-Fe3O4 seeds aggregated from nuclei, followed by growth to produce multilayered MnO/Pd-Fe3O4 or CoO/Pd-Fe3O4 structures. To the best of our knowledge, this is the first report on the hydroboration of styrene with bis(pinacolato)diboron using heterogeneous nanocatalysts. Among these catalysts, CoO/Pd-Fe3O4 nanocomposites showed excellent performance due to the presence of a dual Pd and CoO catalytic system.

Enhanced photocatalytic and SERS properties of ZnO/Ag hierarchical multipods-shaped nanocomposites

Hierarchical ZnO and ZnO/Ag multipods-shaped nanocomposites were synthesized by hydrothermal method employing sea urchin-like ZnOHF nanostructures. Various spectroscopic and microscopic techniques were employed to characterize the nanocomposites. As zinc source, the usage of ZnOHF played a key role in controlling the morphologies and properties of the multipods-shaped nanocomposites. Photocatalytic degradation results showed that ZnO/Ag multipods-shaped nanocomposites exhibited an excellent photocatalytic activity in degrading rhodamine B (RB) dye under UV–visible light irradiation compared with that of ZnO nanomultipods. Such enhanced photocatalytic property opened a new way to prepare novel self-cleaning Surface-enhanced Raman spectroscopy (SERS) substrates. The SERS experiments showed that ZnO/Ag multipods-shaped nanocomposites possessed high SERS sensitivity and reproducibility for four organic dyes after several self-cleaning cycles.

Hierarchical self-supported C@TiO2-MoS2 core-shell nanofiber mats as flexible anode for advanced lithium ion batteries

The requirements of high power density, excellent cycling ability, flexibility and low cost, are of paramount importance and critical to develop flexible lithium ion batteries (LIBs) for wearable instruments. Here we reported the rational design and fabrication of a flexible self-supported lithium ion anode material, which consists of thin MoS2 nanosheets grown on the surfaces of carbon@TiO2 core-shell nanofibers. The resulting hierarchical ternary nanocomposites exhibited high reversible specific capacity (∼1460mAhg−1 at 100mAg−1), excellent cyclability (little capacity loss even after 1000 cycles) and rate performance (928mAhg−1 at 2Ag−1) as anode in LIB. Furthermore, the binder-free anode material demonstrated new opportunities for flexible lithium ion batteries. The superior lithium storage performance is derived from the present well-designed hierarchical nanofiber structure and the synergic effect of different components and numerous interfaces.

The mechanical behavior of hierarchical Mg matrix nanocomposite with high volume fraction reinforcement

Mg-based nanocomposite with hierarchical structure was synthesized via mechanical alloying followed by spark plasma sintering, which was reinforced by 15vol% nanometer-sized SiC particles. Microstructure was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It indicates that the hierarchical microstructure consists of an isolated soft pure Mg phase, with flake like morphology, uniformly distributed in the Mg/SiC nanocomposite. The quasi-static compression test demonstrates that the hierarchical nanocomposite shows significantly higher ductility than that of counterpart with homogeneous microstructure while the result of dynamic test suggests that the ductility of the hierarchical nanocomposite has not improved significantly at high strain rate. The fracture morphology shows both brittle and ductile features partially result from the flake-like soft phase, as well as the hierarchical microstructure.

Integration of graphene in poly(lactic) acid by 3D printing to develop creep and wear‐resistant hierarchical nanocomposites

Polylactic acid (PLA) and graphene reinforced polylactic acid (PLA‐graphene) composites have been fabricated by three‐dimensional (3D) fused deposition modeling (FDM) printing. Indentation creep resistance was analyzed in terms of the strain‐rate sensitivity index of PLA (0.11) and PLA‐graphene (0.21). Enhanced creep resistance in PLA‐graphene is attributed to the restriction of the polymeric chains by graphene, caused by low strain rates identified during secondary creep. The tribological properties of PLA and PLA‐graphene composites were evaluated by ball‐on‐disk wear tests. Wear resistance was increased by a 14% in PLA‐graphene as compared to PLA. A two‐stage coefficient of friction (COF) behavior has been observed for PLA‐graphene. Initially, PLA‐graphene exhibits a 65% decrease in COF as compared to PLA. During the second stage, PLA‐graphene approached similar COF behavior and value of PLA (∼0.58). PLA‐graphene composites have shown significant improvement in creep and wear resistance demonstrating 3D printing to be a novel manufacturing route. POLYM. COMPOS., 39:3877–3888, 2018. © 2017 Society of Plastics Engineers

Hydroxyapatite Nanowire@Magnesium Silicate Core-Shell Hierarchical Nanocomposite: Synthesis and Application in Bone Regeneration.

Multifunctional biomaterials that simultaneously combine high biocompatibility, biodegradability, and bioactivity are promising for applications in various biomedical fields such as bone defect repair and drug delivery. Herein, the synthesis of hydroxyapatite nanowire@magnesium silicate nanosheets (HANW@MS) core-shell porous hierarchical nanocomposites (nanobrushes) is reported. The morphology of the magnesium silicate (MS) shell can be controlled by simply varying the solvothermal temperature and the amount of Mg2+ ions. Compared with hydroxyapatite nanowires (HANWs), the HANW@MS core-shell porous hierarchical nanobrushes exhibit remarkably increased specific surface area and pore volume, endowing the HANW@MS core-shell porous hierarchical nanobrushes with high-performance drug loading and sustained release. Moreover, the porous scaffold of HANW@MS/chitosan (HANW@MS/CS) is prepared by incorporating the HANW@MS core-shell porous hierarchical nanobrushes into the chitosan (CS) matrix. The HANW@MS/CS porous scaffold not only promotes the attachment and growth of rat bone marrow derived mesenchymal stem cells (rBMSCs), but also induces the expression of osteogenic differentiation related genes and the vascular endothelial growth factor (VEGF) gene of rBMSCs. Furthermore, the HANW@MS/CS porous scaffold can obviously stimulate in vivo bone regeneration, owing to its high bioactive performance on the osteogenic differentiation of rBMSCs and in vivo angiogenesis. Since Ca, Mg, Si, and P elements are essential in human bone tissue, HANW@MS core-shell porous hierarchical nanobrushes with multifunctional properties are expected to be promising for various biomedical applications such as bone defect repair and drug delivery.

Engineering of (10-hydroxycamptothecin intercalated layered double hydroxide)@liposome nanocomposites with excellent water dispersity

A hierarchical nanocomposite of 10-hydroxycamptothecin (HCPT), a nonionic and lipophilic anticancer drug, intercalated layered double hydroxide (LDH) encapsulated in liposomes was constructed. HCPT molecules were first incorporated into sodium cholate (Ch) micelles, and the resultant negatively charged HCPT-loaded Ch micelles were then co-assembled with positively charged LDH single-layer nanosheets, forming a HCPT/Ch intercalated LDH (HCPT-Ch-LDH) host-gest nanohybrid. The nanohybrid particles were further coated with liposomes (LSs), gaining a core-shell nanocomposite, denoted as (HCPT-Ch-LDH)@LS. The so-obtained samples were characterized using TEM, SAXS, FT-IR, DLS, and elemental analyses. Special emphasis was placed on the effect of liposome-coating for the HCPT-Ch-LDH on its water dispersity and drug-release. The results showed that the nanocomposite has excellent water dispersity and enhanced drug sustained-release performance in comparison with the HCPT-Ch-LDH, demonstrating that the liposome-coating for drug-LDH nanohybrids is an effective strategy to enhance their water dispersity and sustained-release performances. This work provides an effective strategy for engineering of LDH-based delivery systems for nonionic and lipophilic drugs.

Betamethasone dipropionate intercalated layered double hydroxide and the composite with liposome for improved water dispersity

A hierarchical nanocomposite of betamethasone dipropionate (BDP), a nonionic and lipophilic glucocorticoid drug, intercalated layered double hydroxide (LDH) encapsulated in liposome was constructed by combining host-gest chemistry with a core-shell strategy, to develop a LDH-based drug delivery system with remarkable water dispersity and good sustained-release performance. BDP molecules were first incorporated into sodium cholate (Ch) micelles, and the negatively charged BDP-loaded micelles were then coassembled with positively charged LDH single-layer nanosheets, forming a BDP/Ch intercalated LDH (BDP-Ch-LDH) gest-host nanohybrid. The BDP-Ch-LDH was further coated with liposome (LS) consisting of lecithin and cholesterol, gaining a core-shell nanocomposite, denoted as (BDP-Ch-LDH)@LS. The BDP-Ch-LDH and (BDP-Ch-LDH)@LS were characterized using small angle X-ray scanning, Fourier-transform infrared, transmission electron microscopy, and elemental analyses. Their water dispersity and stability as well as in vitro drug release behavior were investigated. The particle size and sedimentation rate of freeze-dried (BDP-Ch-LDH)@LS redispersed in water (~190nm and 0.035mm/h, respectively) are obviously lower than those of BDP-Ch-LDH (~761nm and 1.028mm/h, respectively). The maximum percentage releases of the (BDP-Ch-LDH)@LS in pH7.4 and 4.8 PBSs (~60% and 80%, respectively) are also lower than those of the BDP-Ch-LDH (both ~90%) under the studied conditions. These results demonstrated that the (BDP-Ch-LDH)@LS has remarkable water dispersity and stability as well as enhanced drug sustained-release performance in comparison with BDP-Ch-LDH. The liposome-coating modification is an effective strategy for improving the practical performance of LDH-based drug delivery system.