最新刊期
卷 ， 期 3 ， 2015
- 摘要：The microstructures in the templates are replicated on the surfaces of large-sized polypropylene samples using microinjection-compression molding in one step.The surfaces molded via the two sieves with different meshes exhibit the dual-level microstructure,which consists of micro pyramids with high aspect ratio and micro ridges.The surfaces molded via four templates,which consist of the aforementioned two sieves stacked with punched plates with different hole diameters,exhibit the three-level microstructure.The three-level microstructure consists of the uniformly distributed micro columns and the aforementioned dual-level microstructures on the top surfaces of the micro columns.All the six surfaces have the static contact angles of above 150 (i.e.,exhibit superhydrophobicity) and the rolling angles of from 5.5 to more than 90 (i.e.,exhibit a wide range of manipulation for the adhesion).For the surface having small-diameter micro columns and a few micro pyramids and micro ridges on their top surfaces,the water droplet forms a global non-composite state,thus high adhesion appears (the petal effect).For the surface having small-diameter micro columns and a number of micro pyramids and micro ridges on their top surfaces,the water droplet forms a localized non-composite state,thus relatively high adhesion appears.For the surfaces having the dual-level microstructures or having large-diameter micro columns and a number of micro pyramids and micro ridges on their top surfaces,the water droplets form a global composite state,thus lower adhesion appears; especially,the surfaces having small-sized micro pyramids and narrower gaps between the micro pyramids exhibit low adhesion (the lotus-leaf effect).关键词：Microinjection-compression molding;Superhydrophobic;Adhesion;Lotus-leaf effect;Petal effect;Hierarchical structures
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发布时间：2021-03-19 - 摘要：The novel flexible polymers with even alkyl chains P-1,P-2 and P-3 are prepared from the monomers S-M-1,S-M-2 and S-M-3 with (R,R)-1,2-aminocyclohexane via a nucleophilic addition-elimination reaction,respectively.The Eu(Ⅲ)-grafting chiral polymers P-4,P-5 and P-6 prepared from the corresponding non-conjugated chiral polymers P-1,P-2 and P-3 by direct coordination reaction of Eu(TTA)32H2O displayed high quantum yield and tunable circularly polarized luminescence (CPL).The CD profile and glum value of dissymmetry of CPL for Eu(Ⅲ) varied with alkyl length of P-1,P-2,and P-3 with high luminescent efficiency observed for P-4,P-5 and P-6.The P-4,P-5 and P-5 all exhibit exclusively red color emission from Eu(Ⅲ) (5D07F2) transition due to almost complete excitation energy transfer from the macromolecular chain to the Eu(TTA)3 moiety.The fluorescent efficiency of P-4,P-5 and P-6 could be tuned by choicing the alkyl chain and further corroborated by emission quantum yields and emission lifetimes.The glum values of the dissymmetry factors of CPL for electronic dipole (5D07F2) transition of Eu(Ⅲ) for P-4 and P-5 are as large as +0.0873 and +0.0115,respectively,whereas P-6 exhibits the largest glum value of about +0.0539 at magnetic dipole (5D07F1) transition.Tunable CPL and luminescent efficiency for Eu(Ⅲ) of corresponding Eu(Ⅲ)-grafting polymer reveal the decisive role of alkyl chain in determining asymmetric coordination environment of Eu(Ⅲ).关键词：Eu(Ⅲ)-grafting chiral polymers;Circularly polarized luminescence;Energy transfer;Effectively tuning
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发布时间：2021-03-19 - 摘要：In order to increase structural selectivity,surface-initiated ATRP and ionic liquid (1-vinyl-3-ethyl acetate imidazolium chloride) as functional monomer were used to prepare molecularly imprinting membranes(MIMs).MIMs were prepared with lysozyme as template,ionic liquids (1-vinyl-3-ethyl acetate imidazolium chloride) as functional monomer,MBA as cross-linking agent,PMDETA as ligand,CuCl as catalyst through surface7-initiated ATRP on the initiator-functional regenerated cellulose membranes in aqueous solution at 35℃.The imprinted density and thickness of lysozyme molecular imprinted membranes were controlled by varying the concentrations of functional monomer.The imprinting factor reaches the maximum (6.25) at the ratio of functional monomer to initiator 100:1,with the water flux 83.0 L/m2/h.The equilibrium experimental data for the lysozyme-MIMs fitted the Langmuir isotherm well,and the binding amount reached 14.8 mg/g.The solid phase extraction experiments demonstrated that lysozyme-MIMs had specific separation and recognition performance in 4 min.Furthermore,permeability analysis experiments demonstrated that the lysozyme-MIMs had higher penetration ability for the target molecules than competitive molecules Cyt C and BHb.Based on the data obtained in separation of lysozyme from the mixed solution,the lysozyme-MIMs separation mechanism belongs to facilitated permeation,the template molecular lysozyme is first specifically adsorbed and concentrated,and then moves through the imprinted membrane by the binding/desorption process.关键词：Ionic liquid;Molecularly imprinting;ATRP;Regenerated cellulose membranes;Lysozyme
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发布时间：2021-03-19 - 摘要：Trisilanolphenyl POSS (TSP-POSS ) with open cage structure was incorporated into PU backbones in concentrations of 0 wt%,3.06 wt%,6.56 wt%,10.13 wt%,12.11 wt%,15.36 wt% and 19.87 wt%,respectively by molecular mechanics and molecular dynamics methods to elucidate the effect of TSP-POSS on structure and thermal properties of polyurethane hybrid composites.These hybrid composites models were characterized by mean square displacement,radial distribution function,temperature-volume behavior and X-ray diffraction at molecular level.The result shows: as TSP-POSS loading is lower than 12.11 wt%,the mobility of the polymer chains is enhanced apparently due to the humping open cage structure of TSP-POSS which increases the average distance between the polymer chains; as TSP- POSS loading is higher than 12.11 wt%,TSP-POSS self-reunites and crystalline clusters are formed which lead to restricting the motion of the polymer chains.According to temperature-volume behavior analysis,the introduction of TSP-POSS can significantly increase the glass transition temperature of polyurethane hybrid composites and thus,the introduction of TSP-POSS is supposed to improve the hybrid composite's thermal stability with reasonable concentration in application.关键词：Molecular mechanics;Molecular dynamics;POSS;Polyurethane;MSD
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发布时间：2021-03-19 - 摘要：The magnetodielectric effect of Fe3O4 nanoparticles and polydimethylsiloxane (PDMS) nanocomposites is reported.The fabrication method of nanocomposites is proposed,and a series of tests on composites including structural characterization,magnetic properties,dielectric properties are performed.It can be concluded that the magnetic properties of the composites depend on the nanoparticle's magnetization.The dielectric constant of the composites with zero magnetic field is increasing with the increase of the nanoparticle concentration,which is consist with the Maxwell-Wagner model.The variation mechanism of relative permittivity as a function of applied magnetic field and the magnetodielectric effect of nanocomposites with different sizes and concentrations of nanoparticles are mainly investigated.The results show that the variation of difference relative permittivity with hysteresis is increasing with the increase in magnetic field.The nanocomposites relative permittivity variation with magnetic field increases as increasing the concentration and the size of nanoparticles.However,the permittivity variation hysteresis of the nanocomposites with bigger nanoparticles is also larger.The studies confirm that the magneticdielectric effect can be observed when the composites are placed in magnetic field,and the variation rate,saturation and hysteresis of the nanocomposites relative permittivity with magnetic field are affected by the concentration and the magnetic properties of nanoparticles including permeability,saturation magnetization and coercivity.关键词：Magnetodielectric;Magnetite nanoparticle;Nanocomposite;Polymer
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发布时间：2021-03-19 - 摘要：The crystallization morphology and lamellae thickness of poly(ethylene oxide)-b-poly(-caprolactone) (PEO-b-PCL) under high pressure CO2 was studied by means of wide-angel X-ray diffraction (WAXD) and small-angel X-ray scattering (SAXS).For the sample of PEO0.5 k-b-PCL24.5 k,only PCL blocks crystallized under 1~3 MPa CO2 and the lamellae thickness of PCL segment decreased with increasing CO2 pressure.The melting behavior and isothermal crystallization kinetics were investigated by using high pressure differential scanning calorimetry (HP DSC).The results indicated that only the melting peak of PCL segments can be observed and the melting peaks widened with increasing pressure.The crystallinity degree (Xc) and melting temperature (Tm) of PEO-b-PCL decreased with increasing CO2 pressure.Xc of PCL in the sample decreased from 46.9% to 36.6% and Tm decreased from 54.5℃ to 47.2℃ under 0 MPa and 3 MPa respectively.The Avrami analysis was performed to obtain the kinetics parameters.The overall crystallization rate decreased with increasing pressure and the crystallization process was controlled by nucleation rate.The half crystallization time (t1/2) of the sample increased from 2.23 min at 0 MPa to 5.83 min at 3 MPa.The value of Avrami index n, is between 3.7 and 4.7,demonstrating a three-dimensional spherulitic growth in the process of isothermal crystallization.The decreasing crystallinity degree and crystallization rate illustrated that pressurized CO2 hindered the crystallization of PEO-b-PCL.关键词：PEO-b-PCL;Melting;High pressure;CO2;Crystallization kinetics
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发布时间：2021-03-19 - 摘要：Plant oil based polyurethanes were synthesized using the mixture of PEG-600 and soybean oil polyol,which were prepared by the ring-opening reaction of epoxy soybean oil (ESO).During the synthesis of prepolymer,polyhedral oligomeric silsesquioxane (POSS) was introduced into the polyurethane molecular chains through the chemical reaction between OH of POSS and NCO of IPDI.Consequently,a series of nanocomposites with different POSS contents were acquired and numbers of characterizations were taken to evaluate the properties of these materials such as thermal stability,mechanical properties and surface hydrophobicity.TGA results show that under O2 atmosphere,the hybrid polyurethanes display both enhanced initial decomposition temperatures (Td5) and final stable temperature (Tf).Especially,when the POSS mass content reaches 9.27%,the obvious weight loss disappeared.While in terms of DSC,the effects of POSS on glass transition temperature (Tg) seem complex,which would enhance Tg with low POSS contents but weaken with high contents.Mechanical and contact angle test results show that with the introduction of POSS,both the tensile strength and hydrophobicity of hybrid polyurethanes can be enhanced to some extent.The morphology observed by scanning electron microscopy (SEM) showed that POSS may occur to aggregate with high mass content.Thus an opportunity of future applicability and study in the areas of biodegradable polymers with improved properties can be envisioned in our research method of hybrid polyurethanes.关键词：Polyphenylsilsesquioxane;ESO;PEG-600;Plant oil-based polyurethanes;Composites
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发布时间：2021-03-19 -
Preparation and Applications of Poly(butylene succinate) Copolymers Bearing Sulfonate Pendent Groups
摘要：A novel amphiphilic poly(butylene succinate) PBS copolymer bearing sulfonate pendent groups was synthesized via a two-step synthetic strategy.First,unsaturated copolyester poly(butylene succinate-co-butylene fumarate),P(BS-co-BF) was prepared via the solution polymerization of the succinic acid,fumaric acid and 1,4-butanediol in the presence of titanium tetraisopropoxide as the catalyst.Second,sulfonation of P(BS-co-BF) was carried out by the reaction with slight excess of NaHSO3 in 2-methoxyethanol/water mixture (120℃ for 12~26 h),resulting in 100% sulfonation,and PBS copolymers bearing sulfonate groups,P(BS-co-SBS)s,were obtained.To establish structure-function relationships,three copolymers,P(BS-co-SBS)s with different SBS molar contents were synthesized,and the SBS molar content in the P(BS-co-SBF)s was 18%,27% and 40%,respectively.The chemical structures of copolymers were characterized by 1H-NMR,FTIR and gel permeation chromatography (GPC).Moreover,self-assemblies behavior of these amphiphilic copolymers P(BS-co-SBS)s in water was investigated by means of UV spectrometer,and the sizes and morphologies of them were examined by dynamic light scattering (DLS) and transmission electron microscopy (TEM),respectively.The results showed that the copolymers P(BS-co-SBS)s can self-assembly into stable,core-shell spherical,small-sized (103~165 nm,PDI:0.187~0.264) nanomicelles with negative surface charges (-35~-51 mV).In vitro drug release showed that copolymers P(BS-co-SBS)s have certain pH-responsive function.关键词：Poly(butylene succinate-co-butylene fumarate);Sulfonation;Self-assembly;Nanomicelle;Drug delivery- 31
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发布时间：2021-03-19 - 摘要：In order to improve the hemocompatibility polysulfones (PSF) covalently-attached compound 1 (HTEP) containing phosphorylcholine structure via ether bond were prepared. Firstly, PSF was activated with chloromethylation reagent to give chloromethylated polysulfone 2 (CMPSF). Then compound 2 reacted with compound 1 by the reaction between benzyl chloride and hydroxyl group to give phosphorylcholine-coated PSF (PSF-HTEP) (3). The grafted materials 3 with different grafting ratios of compound 1 were characterized by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), element analysis (EA) and H-atom nuclear magnetic response spectroscopy (1H-NMR). The surface properties of PSF-HTEP (3) membranes were tested by contact angle measurements and the results showed that the membranes of grafted materials 3 possessed more hydrophilic surface with the increase of the number of grafting ratio of compound 1, as expected. The blood compatibilities of membranes (3) were evaluated by testing their hemolytic properties and comparing the experimental results of platelet-rich plasma adhesion of PSF-HTEP (3). The results showed that all hemolytic rates of membranes (3) with different grafted ratios were less than 5% and that the number of platelet adhesion on the surface of PSF-HTEP (3) decreased dramatically with the increase of graft ratio of 1, and in particular even no platelet adhesion was observed on the surface of PSF-18.1% 1 membrane. Such a novel PSF-HTEP (3) containing phosphorylcholine structure showed improving blood compatibility, which was supported by the hypothesis of maintaining natural behavior and revealed a promising potential use in hemocompatibility materials.关键词：Polysulfone;Phosphorylcholine zwitterion;Surface modification;Platelet adhesion;Antithrombogenic biomaterials
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发布时间：2021-03-19 - 摘要：The purpose is to study the preparation of p type polyaniline (PANI) nanowire array and the fabrication of high performance UV photodetector with p-n junction based on p type polyaniline nanowire array and n type silicon.High-density polyaniline nanowire array was fabricated by using a layer of manganese dioxide as seed layer which was prepared by spin-coating method on the silicon substrate.The influence of different conditions on the morphology of polyaniline was discussed,and the growth mechanism of polyaniline nanowire array was revealed.It was found that polyaniline nanoparticles were priorly generated on the manganese dioxide seed layer with the oxidation of manganese dioxide seed layer to aniline in solution.The polyaniline nanoparticles grew vertically when another oxidant of ammonium persulfate(APS)was added into the solution,and high-density p type polyaniline nanowire array was obtained.Furthermore,high performance UV photodetector was fabricated with fast photoresponse,short recovery time and good stability based on the p-n junction of p type polyaniline nanowire array and n type silicon.When the bias voltage was 0 V,photocurrent was 9.210-8A.And the intensity of photocurrent increased greatly when the bias voltage was improved.When the bias voltage arrived at 5 V,the photocurrent was improved to 3.210-5A which was 1000 times higher than that with 0 V bias voltage.关键词：Manganese dioxide;Polyaniline nanowire;Array;p-n junction;UV photodetector
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发布时间：2021-03-19 - 摘要：Well-defined poly(3-hexylthiophene)-b-poly(quinoxaline-2,3-diyl)(P3HT-b-PQD) conjugated block copolymer was readily synthesized in one pot via mechanistically distinct,sequential living block copolymerization with Ni(dppp)Cl2 as a single catalyst at room temperature.The P3HT-b-PQD block copolymer gives yellow color in THF and exhibits strong light emission under UV irradiation at 365 nm.It was found that the synthesized P3HT-b-PQD copolymer can visually detect Co2+ in THF by changing its color from yellow to light green.The detection is of high selectivity as the addition of other metal ions did not induce any change on the solution color,including Pb2+,Na+,Al3+,K+,Mn2+,Fe2+,Fe3+,Zn2+,Ni2+,Ag+,Cu+,Cu2+,Eu3+,Cd2+,Mg2+,Ca2+,Cs+,Ba2+,Hg2+ and Pd2+.Moreover,the P3HT-b-PQD exhibits highly selective fluorescent senses of Co2+ over most of competing ions by changing its orange light emission to deep green in diluted THF solution.The detection limit of Co2+ by this P3HT-b-PQD block copolymer can be down to 10-7 mol/L.Further investigation revealed that the interference of other competing transition metal ions on the visual detection of Co2+ is negligible.Such visual detection of Co2+ by P3HT-b-PQD block copolymer can be put into practical applications by using test strips and thin films,making it a practical,convenient and highly selective visual cobalt probe by naked-eye.Transmission electron microscopy(TEM) observation indicated the P3HT-b-PQD was self-assembled into core-shell supramolecular structures upon coordinated with Co2+ ions.关键词：Polythiophene;Polyquinoxaline;Conjugated polymer;Block copolymer;Co2+ ion detection
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发布时间：2021-03-19 - 摘要：A branched polyethylene resin was selected as an example to study the effects of experimental parameters of successive self-nucleation and annealing method on the results of thermal fractionation.Experimental parameters,such as the first selected self-seeding temperature (Ts),heating and cooling temperature rates,temperature interval (T),and the permanence time at Ts,are studied extensively in successive self-nucleation and annealing (SSA) thermal fractionation.A series of optimized parameters are obtained,which provide the reference for its application.In addition,the results from step crystallization (SC) and SSA thermal fractionations are compared carefully.关键词：Polyethylene;Thermal fractionation;Experimental parameter;Optimization
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发布时间：2021-03-19 - 摘要：In order to form the hydrophilic nanoparticles,the oleylamine ligand of oil-soluble iron oxide nanoparticles(IONPs) were ligand -exchanged with the amine groups of poly(amidoamine) dendrimers.Then the targeting molecules 5-hydroxytryptamine (5-HT) which can target myeloperoxidase in the atherosclerotic plaque were grafted on the dendritic polymer coating of nanoparticles.Finally,a targeted contrast imaging system (poly(amidoamine) dendrimers coat IONPs-graft-PEG-graft-5-HT,5-HT-PEG-G3.0@IONPs) which can target to atherosclerotic plaque and image for magnetic resonance imaging was achieved.Structure of all the samples were characterized by FTIR which could confirm that the products were successfully prepared.The sizes of particles were tested by dynamic light scattering (DLS) and also observed under transmission electron microscope (TEM).According to the tests,the nanoparticles showed a spherical and monodispersed structure,and DLS result showed that the diameters of 5-HT-PEG-G3.0@IONPs were about 31 nm and the TEM result was about 10 nm,respectively.The standard curve of 5-HT was portrayed based on the characteristic absorption peak at 276 nm in the UV-Vis test.Then the amount of 5-HT grafted on the final products was defined and the content of 5-HT was 6.19 g/mg.The results of thermogravimetric analysis (TGA) showed that about 2 wt% iron oxide was in the nanoparticles,and vibrating sample magnetometer (VSM) revealed the superparamagnetism of 5-HT-PEG-G3.0@IONPs nanoparticles,and the saturation magnetization was 1.47 Am2/kg.关键词：Magnetic iron oxide nanoparticles;Myeloperoxidase;5-Hydroxytryptamine;Targeted MRI agent
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发布时间：2021-03-19 - 摘要：Fluorescent and thermo-responsive cellulose nanocrystals (CNCs) were synthesized via surface-initiated single-electron transfer living radical polymerization (SI-SET-LRP) in the component solvent system of DMF/H2O.The grafting of poly (N-isopropylacryalamide) (PNIPAAM) brushes on CNCS was confirmed and analyzed by Fourier transform infrared spectroscopy,solid-state 13C nuclear magnetic resonance spectrometry and transmission electron microscopy.The initiator immobilization and subsequent grafting polymerization were proven to be limited on the surface of CNCs without the change of core.Grafted brushes with molecular weight in the range of 1500 and 13000 and relatively low polydispersity index were synthesized.Both the conversion of monomer and the molecular weight of polymer brushes increase with an increase in the H2O proportion of the solvent system.The change trend of decomposition and glass transition temperature from low to high temperature direction also proved the increasing length of brushes.The surface-grafted CNCs possessed good dispersity and stability in water because of the hydrophilicity of CNCs and the grafted PNIPAAM at room temperature.They showed reversible state conversion between dispersion and coagulation upon temperature shift around the lower critical solution temperature (LCST).The fluorescent intensity of the surface-grafted CNCs increases as the length of polymer brushes increases.They also showed thermo-enhanced fluorescence based on the thermo-responsiveness of the grafted PNIPAAM brushes.关键词：Cellulose nanocrystals;Single-electron transfer living radical polymerization;Poly(N-isopropylacryalamide);Thermo-responsiveness;Fluorescence
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发布时间：2021-03-19 - 摘要：A mechanism is developed to analyze the cross-stream migration of macromolecules under shear flow in micro channels.The macromolecule is modeled with the bead-spring chain model.The chain is stretched by shear force,and hydrodynamic interaction between two adjacent beads induces a symmetry flow field.However,the symmetry of the flow field is broken in the presence of a wall,thus hydrodynamic interactions between the chain and the wall lead to migration away from the wall.Under strong confinement,this hydrodynamic effect is screened.Then dissipative particle dynamics (DPD) approach is used to investigate the migration of macromolecules under pressure driven flow in micro channel to prove the validity of the mechanism.The simulation results show that the chains migrate away from the channel walls at weak confinement,and there is no such a migration at strong confinement.The migration of -DNA macromolecules in the vicinity of a wall is also studied through experiments.The good agreement of the simulation results and the experimental observations with the mechanism predictions verify the validity of the mechanism.The chain concentration can also affect the migration of the chains.The chains migrate away from the channel walls at a lower chain concentration,but at a higher concentration the chain migration away from the wall diminishes,indicating that the screening of chain-wall hydrodynamic interactions will occur for the higher concentration solutions.关键词：Micro channel;Macromolecules;Cross-stream migration;Chain concentration
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发布时间：2021-03-19 - 摘要：A series of novel polyimide(PI) copolymers with tailored properties were synthesized via the poly-(amic acid)s (PAAs) from the reaction of 3,3',4,4'-biphenyl tetracarboxylic dianhydride with 4,4-oxydianiline(ODA) and 2,5-bis(4-aminophenyl)pyrimidine (PRM).PRM has an extended conjugated rigid rodlike structure containing the pyrimidine group.The effects of the content of PRM on thermal and mechanical properties of the copolymers were investigated.Their glass transition temperatures and the temperatures of 5% weight loss were evidently improved with increase of the molar ratio of PRM to ODA.The tensile strength and modulus of the copolymer films were increased in accordance with the order of the rigidity of the polymer backbones.The value of the coefficient of thermal expansion (CTE) gradually decreased as the PRM content increased.At a molar ratio of PRM to ODA of 1:1,the CTE values of the PI was 1710-6 K-1,which was the same value as that of the copper foil.The two-layer flexible copper-clad laminates (FCCLs) were prepared by coating these PAAs solutions onto copper foils and then imidizing thermally.The adhesion strength of polyimide/copper laminate showed peaky curve with the increase of PRM content.While a molar ratio of PRM to ODA at 1:1,the 90-peel strength of the laminate reached a maximum value of 17.3 Ncm-1.The flexible structure of ODA and the chemical nature of PRM lead to two-layer FCCL with high adhesion strength as well as thermal-dimensional stability.Furthermore,scanning electron microscope was employed to determine the fracture surface morphology of PI/copper joints.关键词：Polyimide;Diphenylpyrimidine;Adhesion strength;Flexible copper-clad laminate
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发布时间：2021-03-19 - 摘要：Inspired by the relationship between microstructure and mechanical properties of natural nacre, clay/poly(vinyl alcohol) artificial nacre was prepared through evaporation-induced assembly of poly(vinyl alcohol)/coated clay nanoplatelets. The clay loading in the artificial nacre is determined as 52 wt% by thermogravimetric analysis. A well-defined layered structure is proved by scanning electronic microscopy, transmission electronic microscopy and X-ray diffraction. FTIR proves that hydrogen bond is formed between clay and PVA. Tensile test results show that the strength of the artificial nacre is about (90.28.0) MPa, comparable to that of natural nacre (80~135 MPa). Importantly, the elongation at break and tensile toughness reach (14.72.3)% and (10.63.0) MJ/m3, respectively, which are much higher than those of the reported bio-inspired layered montmorillonite/polymer nanocomposites. The improved strength is attributed to the high clay loading, ordered layered structure and strong interfacial adhesion. Interestingly, appropriate aspect ratios of clay platelets enable the artificial nacre to fail in the form of clay platelet pull-out and thus leads to high toughness. In addition, the artificial nacre is transparent because of reduced light scattering, arising from ordered layered structure and small diameter of the used clay. The transparency of the artificial nacre is more than 90%.关键词：Clay;Layered structure;Mechanical property;Nacre;Self-assembly
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发布时间：2021-03-19
Research Article
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