最新刊期
卷 ， 期 10 ， 2012
- 摘要：Composite films with stimulus-responsive property and self-healing ability represent a group of important biomimetic film materials.The layer-by-layer (LbL) assembly,which involves multiple dipping and rinsing steps for the fabrication of composite films,enables precise control of film composition and structure.LbL assembled films with micrometer thickness can be designed to respond quickly and effectively to various external stimuli,and are therefore promising for use as biomimetic films.We demonstrate herein that the LbL assembled polyelectrolyte multilayer films with micrometer thickness can be utilized for the fabrication of humido- and thermo-responsive bilayer free-standing films capable of bending/unbending movements,which are useful as highly efficient actuators and walking-devices.The LbL is assembly also promising in the fabrication of self-healing superhydrophobic coatings and water-enabled self-healing polyelectrolyte films capable of repairing severe damage of cuts.关键词：Layer-by-layer assembly;Free-standing films;Self-healing;Smart materials
- 55
- |
- 27
- |
- 7
发布时间：2021-03-19 - 摘要：Polymer biomimetic ordered microstructures which possess antireflective or responsive properties are mainly presented in this paper,and their recent reports on biomimetic design,structure fabrication and performance studies are reviewed meanwhile.Finally we outlook the developmental trend of these ordered microstructures,problems and challenges they faced for future applications.关键词：Biomimetic;Ordered microstructures;Antireflective;Responsive;Polymer;Colloidal crystals
- 27
- |
- 14
- |
- 0
发布时间：2021-03-19
Feature Articles
- 摘要：Wettability gradient surfaces are specific gradients on which surface wettability continuously changes with surface position variation.In the past 20 years,due to the wide applications in smart coatings,microfluidic devices and liquid self-transportations,people investigated and prepared a lot of kinds wettability gradient surfaces,which overall could be divided into three categories:(1) chemical-composition gradients, (2) surface-morphology gradients and (3) topography/chemical composition gradients.This paper focuses on the classification and distinction of these three categorized gradients,and also summarizes novel and mainly techniques appeared recently in the preparation of wettability gradients,such as diffusion method,immersion method,etching/printing,mechanical stretching method,meniscus template and the temperature gradient method, etc .The advantages and disadvantages of these methods are also summarized.At present,although the research of wettabilty gradients is still in infancy,however,the applications of these gradients in the research of biological protein or cell adsorption,liquid transportation have developed into a mature discipline.At the end of this paper,the recent research progresses of wettabilty gradient surfaces in the areas of biological protein,cell adsorption,liquid self-transportation and the future development of this subject are reviewed.关键词：Wettabilty;Gradient;Contact angle;Self-transportation;Cell adsorption
- 55
- |
- 26
- |
- 0
发布时间：2021-03-19 - 摘要：Smart hydrogels are one kind of soft materials adopting water as the dispersion medium,which could respond to the external changes in the surrounding environment,such as temperature,pH value,pressure,solvent,light or electric/magnetic field,and further induce reversibly continuous or discontinuous volume phase transitions by absorbing or squeezing several-fold water out of themselves.In recent years,chiral hydrogel emerges as a new research field and will find broad applications in chiral recognition,enantiomeric separation,controlled drug release and microfluid devices,which have become one of the research focuses in the interdisciplinary fields among material sciences,chemistry and biomedicines.However,how to obtain chiral hydrogels with sensitive and accurate responsiveness,well-defined nano- and micro-structures,as well as the controllable formation process,have become the critical points of research.In this review,recent progresses in chiral hydrogels are summarized,including various preparation methods to construct polymer hydrogels with three-dimensional network structures or small molecular hydrogels with helical structures,as well as some vagarious gel formation process in which chirality is transferred from singular molecules to nanoscale architectures and macroscopic behavior of hydrogels.Finally,the applications and tendency of future development of these materials are introduced.关键词：Hydrogels;Chirality;Gelator;Self-assembly
- 100
- |
- 28
- |
- 2
发布时间：2021-03-19 - 摘要：Underwater superoleophobic surfaces are surfaces that display contact angle with oil droplets larger than 150? in oil/water/solid three-phase system.In this review two typical biological surfaces which own excellent superoleophobic property in water,the fish scales and lower side of lotus leaf were introduced.The key factors influencing the underwater superoleophobicity were discussed and concluded.Based on this,a design route of constructing underwater superoleophobic systems was raised.Then the fabrication approaches and recent developments of underwater superoleophobic surfaces were introduced.The intelligent underwater superoleophobic surfaces with stimuli-responsive wettability and oil adhesion were summed up briefly.The applications of underwater superoleophobic surfaces,such as oil droplets manipulation,anti-bioadhesion and oil water separation,were introduced.At the end of this review,the challenges and future developments of underwater superoleophobic system were discussed.关键词：Bioinspired;Underwater superoleophobicity;Superhydrophilic;Micro/nano hierarchically structures
- 120
- |
- 39
- |
- 10
发布时间：2021-03-19 - 摘要：Some biological surfaces especially synovial joints show excellent aqueous lubrication and very long service life under high loads and complex body environments,which are attributed to self-adaptive articular cartilage and bottle-brushes like biomacromolecules in synovia.Surface grafted polymer brushes are used to imitate the excellent lubrication of synovial joints.Here is a brief review of progress on polymer brushes for aqueous lubrication,especially on lubrication mechanism of different polymer brushes (e.g.biomacromolecules,polyelectrolyte brushes,polyzwitterion brushes and neutral polymer brushes).Finally,some problems in current research and perspectives in the future on biomimetic aqueous lubrication are discussed.关键词：Polymer brushes;Biomimetic lubrication;Aqueous lubrication;Biocompatibility
- 76
- |
- 26
- |
- 5
发布时间：2021-03-19 - 摘要：Photosynthesis is one of the most important chemical reactions in nature.In higher plants,these photosystems are integrated in to the thylakoid membrane of the chloroplast.Light harvesting in photosynthetic organisms is largely an efficient process.It is assembled together by the antenna pigments and proteins,and synergetic assembly plays an important role in the process.In order to design an efficient photosynthetic device it is very important to realize the structure of the light harvesting and the role of pigment and proteins.This article reviewed the latest developments of artificial light harvesting systems after a brief introduction to natural light harvesting protein.Hybrid scaffolds assembled together with various organic chromophores were discussed in detail.However,it still remained a challenge to organize the extremely efficient,robust,autonomic and yet flexible artificial light harvesting systems.Finally,some possible approaches which might be helpful to improve the biomimetic light harvesting materials overall quality were proposed,and the prospective on the future development was tentatively discussed.关键词：Biomimetic materials;Light harvesting protein;Artificial light harvesting
- 91
- |
- 33
- |
- 4
发布时间：2021-03-19 - 摘要：Responsive colloidal photonic crystals (PCs) are of great importance for the extended applications in the fields of chemical sensing,smart display and so on,owing to the visible structure color/optic signal change to exterior stimuli.This paper presented the research progress about the improvement of the response rate of swell-responsive polymer PCs,which covered the responsive mechanism and critical influencing factors,including dimension of PC hydrogel,physical structure/chemical properties of polymer chains and crosslinking degree of gel network.In addition,response rate of non-swollen PCs with other response types,such as magnetic,electric,optical or mechanical response were also involved.Understanding the performance of these PCs will be helpful for the development of novel and advanced responsive systems.关键词：Photonic crystals;Responsiveness;Response rate;Hydrogel swelling
- 69
- |
- 24
- |
- 2
发布时间：2021-03-19 - 摘要：Self-assembly inspired from nature has been regarded as an important areas of basic and applied research,and it was an interdisciplinary research field including chemistry,materials science,biomedical engineering etc.With the inspiration from viral capsids,researchers are expecting to fabricate the capsid-like architectures with the self-assembly learning from natural or artificial units and mimick the capsid functions.The peptide-based self-assemblies for mimicking viral capsids were highlighted in this review.Recent progresses on biomedical applications of self-assemblies mimicking viral capsids were reviewed.关键词：Bio-inspired self-assembly;Mimicking viral capsids;Drug/gene delivery systems;Peptide-based self-assembly
- 54
- |
- 17
- |
- 1
发布时间：2021-03-19
Reviews
- 摘要：To mimic the fluorescence enhancement behavior of green fluorescent protein (GFP),an amphiphilic polymer,poly (ethylene glycol)-chromophore-poly (-caprolactone) (PEG-c-PCL),was successfully prepared by ring-opening polymerization using chromophore-endcapped PEG as the macroinitiator.1H- and 13C nuclear magnetic resonance (1H and 13C-NMR),Fourier transform infrared spectroscopy (FTIR),gel permeation chromatography (GPC) and ultraviolet-visible absorption (UV-Vis) were applied to study the structure and properties of PEG-c-PCL.Both the chromophore and PEG-c-PCL gave similar UV-Vis spectra with a maximum absorption peak at about 371 nm.From the emission spectra,the chromophore had an emission peak at about 427 nm,while PEG-c-PCL showed a 6 nm red-shift,attributable to the influence of polymerization.The amphiphilic PEG-c-PCL could self-assemble into nanoparticles with a diameter of about 160 nm,which was confirmed by transmission electron microscopy (TEM) and dynamic light scattering (DLS) measurements.Importantly,the emission intensity of PEG-c-PCL increased by about 55 times after self-assembly into nanoparticles,and the emission peak showed a 14 nm red-shift in the emission spectrum.These phenomena could be attributed to the chromophores rotation restriction and the increased interactions after self-assembly.Finally,the self-assembled PEG-c-PCL nanoparticles were successfully used in cell imaging,illustrating the potential application of this new kind of fluorescent polymer.关键词：Fluorescent polymer;Green fluorescent protein;Self-assembly;Imaging
- 25
- |
- 14
- |
- 0
发布时间：2021-03-19 - 摘要：Biodegradable poly(propylene fumarate)(PPF) was synthesized by a two-step method,which was then copolymerized with N -vinyl pyrrolidone(NVP) in 1,4-dioxane to fabricate PPF hydrogels.By changing the relative contents of monomers and solvent,hydrogels with different swelling property and mechanical strength were obtained.Generally,with a larger volume of solvent the hydrogel had a larger swelling ratio but a smaller compressive modulus due to the existence of pores in the matrix.Considering the balance between the hydrogel swelling and mechanical strength,a composite hydrogel with a macroporous structure was further fabricated by mixing 30% PPF and NVP,3% hydroxyapatite(HA) nanoparticles and benzoyl peroxide in 1,4-dioxane,following by casting the mixture into NaCl particles(280~450 m as porogens),polymerization and removal of porogens.Addition of the HA particles increased the compressive modulus of porous hydrogels by 61%.Due to the sufficient exposure of the pre-loaded HA nucleation seeds and the good ability of medium exchange,significantly faster apatite growth was found in the composite macroporous hydrogel after being incubated in simulated body fluid,demonstrating that the PPF-NVP/HA macroporous hydrogel has better bone formation activity than the pure PPF-NVP macroporous hydrogel.关键词：Poly(propylene fumarate);Nanosized hydroxyapatite;Porous hydrogels;Mineralization
- 29
- |
- 16
- |
- 0
发布时间：2021-03-19 - 摘要：For fabrication of biomimetic structures,it is in lack of a facile and versatile method other than simple replication of bio-template.By using particle-assisted breath figure (BF) method in which solid particles are used as stabilizers in the BF method,we prepared regularly patterned porous polymer films with particle arrays decorating the inside walls of the open pores.First, particle-assisted fabrication of honeycomb-structured hybrid films was carried out by employing solid particles as stabilizers in the BF method.The self-assembly of nanoparticles at the fluid/fluid interface (Pickering emulsions) in the BF method has been explored to direct nanoparticles onto BF microarrays.Regularly patterned porous polystyrene films with particles decorating the inside walls of the open pores can be readily prepared.Furthermore,micropores decorated by particles with different covering densities were formed by carefully controlling the application quantity of silica nanoparticles.Using the obtained BF porous film as molding substrate,we prepared poly(dimethylsiloxane) (PDMS) negative replica (reverse honeycomb-structured substrate) with arrays of island-like protuberances by means of soft lithography.Hierarchical PDMS surfaces were successfully fabricated by complete transfer of the decorating particles onto the PDMS protuberances.And such structure highly mimics the compound eyes.It could provide inspirations for designing the artificial biomimetic structures based on self-assembly and soft lithography.关键词：Breath figure method;Compound eyes;Superhydrophobic surface;Micro- and nanoscale hierarchical structure
- 36
- |
- 17
- |
- 4
发布时间：2021-03-19 - 摘要：PCL-b-PEG with different composition and functional groups were used to prepare microspheres with different surface properties by means of the double emulsion solvent evaporation method. Then, the biomineralization of microspheres was performed in the 1.5 simulated body fluid (1.5SBF). The effects of the hydrophilicity, roughness and functional groups of microsphere surface on the formation of apatite were studied. It was found that the higher molar ratio of PEG to PCL leads to rougher and more hydrophilic microsphere surface, which results in the formation of more apatite. The functional groups were found to have great influence on the formation and distribution of apatite on the surface of microspheres. Apatite was distributed homogeneously on the surface of PCL20K-b-PEG1K-COOH microspheres. Moreover, the amount of apatite on microsphere surface increased with the mineralization time. The biomineralization had an initial period of ca. 4 days for apatite nucleation, followed by normal gradual growth. The results of this work indicate that the surface properties of microspheres such as hydrophilicity, roughness and functional groups as well as the biomineralizaiton time could be used to control the apatite formation on microsphere surface. These results are expected to be used in the construction of tissue engineering scaffolds.关键词：Aliphatic polyester;Microspheres;Apatite;Biomimetic mineralization method
- 28
- |
- 13
- |
- 3
发布时间：2021-03-19 - 摘要：Lentinan,a mushroom polysaccharide,isolated from Lentinus edodes (Shiitake mushroom) was carboxymethylated in NaOH and isopropanol solution to obtain a water-soluble derivative.Then,carboxymethylated lentinan was covalently immobilized onto the surface of aminated poly(lactic acid) (PLA) substrates via chemical grafting method.In addition,carboxymethylated lentinan and chitosan were alternatively deposited on the aminated PLA substrates via layer-by-layer (LbL) assembly method,in order to construct a polysaccharide-based multilayer on the substrates.The carboxymethylated lentinan was proved by infrared spectroscopy.The degree of substitution and molecular weight (Mw) of carboxymethylated lentinan were determined by UV spectrophotometry and gel permeation chromatography (GPC),respectively.The modified and unmodified PLA surfaces were investigated by scanning electron microscope (SEM) and water contact angle measurements.The hemolysis test,thrombus test,and the antibacterial activity against Escherichia coli of modified and unmodified PLA were tested in vitro,respectively.Then,the surface properties of PLA modified by different modification methods were evaluated and compared.The results showed that the hydrophilicity,blood compatibility,and antibacterial activity against Escherichia coli of PLA modified by LbL assembly and chemical grafting were both improved.In addition,PLA modified by carboxymethylated lentinan and chitosan through LbL assembly method showed better hydrophilicity,blood compatibility,and antibacterial activity against Escherichia coli,in comparison with that modified by chemical grafting method.关键词：Poly(lactic acid);Carboxymethylated lentinan;Surface modification;Chemical grafting;Layer-by-layer assembly
- 38
- |
- 25
- |
- 2
发布时间：2021-03-19 - 摘要：Novel chiral N-propargylphosphonamidate monomers containing phenoxyl,imentholyl groups (1a) and propargyl esters having PEG side chain (1b ~ 3b) with different lengths were synthesized by successive condensation.The single peak in the 31P-NMR spectrum indicated that pure diastereomer (1a) was obtained by using column chromatography on silica gel and then recrystallizing.The corresponding polymers with moderate molecular weights (Mn=1.8104~2.5104) in good yields (42.6%~80.3%) were synthesized by copolymerization of the diastereomer (1a) using (nbd)Rh+［6-C6H5B-(C6H5)3］ as catalyst.The polarimetric,CD and UV-Vis spectroscopic data revealed that polymers existed in a helical form with one-handed screw sense predominantly in CHCl3 solvent.This study further shows that the helical structure was influenceed by internal and external factors .When the molecular weight of b block increases,the intensity of CD becomes higher.It was found that the secondary structure stability of the copolymer was better than homopolymer's in different mixed solvents.When the methanol quantity was up to 50%,the CD spectra changeed into positive and negative parts caused by the accumulation of the polymers .The assembly phenomenon of the Poly (1a -co- 3b) was studied in different solvent systems(CHCl3/CH3OH,THF/H2O) .It is clear from the SEM images of these systems,Poly (1a -co- 3b) can be assembled into spherical shape and rodlike micellae in different solvents.关键词：P-chiral center;Helical structure;Polyacetylene;Self-assemble
- 31
- |
- 11
- |
- 2
发布时间：2021-03-19
Research Article
- 摘要：Novel phosphorus-containing liquid crystalline copolyesters based on biphenyl mesogenic monomer (PDEBP) were synthesized by polycondensation of dimethyl biphenyl-4,4'-dicarboxylate (DBD),diethylene glycol (DEG) and a phosphorus-containing diol,2-(6-oxido-6H-dibenz1,2oxaphosphorin-6-yl)-1,4-phenylenebis(oxy)diethanol (DOPO-HQ-HE).Chemical structure of the PDEBP was characterized by 1H-NMR spectroscopy,and the thermal and liquid crystalline behaviors of the copolyesters were investigated by thermogravimetric analysis (TGA),differential scanning calorimetry (DSC) and hot-stage polarizing optical microscope (POM).TGA results suggested that char formation of the copolyesters was improved with the introduction of DOPO-HQ-HE without destroying the initial thermal stability of the polymer,and the residue at 700℃ in N2 (WtR700) of PDEBP7.5 (7.5 mol% of DOPO-HQ-HE in copolyester) reached 31.9 wt%,having a positive influence on flame retardance of the copolyesters.DSC tests suggested that the crystallinity of the copolyesters was destroyed by incorporating DOPO-HQ-HE into the main chain due to the bulky pendent group.The isotropic temperature (Ti) and endothermic heat (Hi) were decreased by increasing the amount of DOPO-HQ-HE,and the Ti and Hi of PDEBP7.5 reached 129℃and 1.61 J/g,respectively.POM observations showed that a typical birefringence phenomenon of nematic schlieren structure could be found in the processes of both heating and cooling,in accord with the results of DSC tests except these of PDEBP7.5,for which it was hard to find the birefringence phenomenon during heating and cooling by POM,indicating the further introduction of the phosphorus-containing diol could destroy the liquid crystalline behavior of the resulting copolyester.
- 51
- |
- 15
- |
- 0
发布时间：2021-03-19
Research Bulletin
- Postal code：100190
- Tel：010-62588927 Email：gfzxb@iccas.ac.cn
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备05002797号-8
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0