122 results about "Pi interaction" patented technology

The invention relates to a method for functionalizing a polymer on the surface of nano graphene oxide. The method comprises the following specific steps: preparing graphene oxide from natural graphite powder by an improved Hummers method, utilizing methoxy polyethylene glycol and pyrene acids to carry out esterification to generate polyethylene glycol with pyrenyl as the terminal group, and finally grafting the polyethylene glycol with pyrenyl as the terminal group on the surface of graphene oxide through pi-pi interaction between pyrenyl and the surface of graphene oxide, thus obtaining the graphene oxide with the functionalized polymer on the surface. The solubility of the prepared graphene oxide with the functionalized polymer on the surface is greatly improved. The method has the following advantages: a main process adopted in the experiment is as follows: a polymer with a complex structure is designed and prepared in advance and then is grafted on the graphene oxide, and the grafting reaction can be carried out at normal temperature and pressure, so the whole experiment process is very simple and convenient. Therefore, the study provides a direct method for modifying the graphene oxide and preparing the functionalized graphene oxide-polymer complex to form a new inorganic-organic hybrid material, thereby promoting the development and application of graphene oxide-based materials.

The invention discloses a graphene conductive composite coating material. The graphene conductive composite coating material contains macromolecular film-forming resin, graphene and a graphene dispersant; and the graphene dispersant contains an aniline oligomer or a derivative thereof or soluble polyaniline which can be combined with the graphene through PI-PI interaction so as to enable the graphene to be uniformly and stably dispersed in the macromolecular film-forming resin or a mixture of the macromolecular film-forming resin and water and/or an organic solvent. The invention also discloses a preparation method for the coating material. According to the coating material disclosed by the invention, the graphene can be uniformly and stably dispersed in a coating material matrix, so that the application of the coating material in the aspects of conductive macromolecular coatings and the like can be greatly promoted; the preparation process is simple, does not need complex chemical reactions and is easy to control, and the coatings made from the coating material have good bonding capability on surfaces of macromolecular materials, metallic materials, textile materials and ceramic materials; and meanwhile, the coating material also has the characteristics of radiation resistance, electrostatic resistance, corrosion prevention, wave absorbing, wear resistance and the like, thereby being broad in application prospect.

The invention discloses a surface modified aramid fiber and a preparation method thereof. Clean aramid fiber which is cleaned is dipped into a dopamine solution under a weak basicity condition to obtain a dopamine wrapped aramid fiber; through an esterification reaction and pi-pi interaction between oxidized graphene and the dopamine wrapped aramid fiber, a high-grafting-ratio oxidized graphene layer is formed on the surface of the aramid fiber, so that the surface modified aramid fiber is obtained. The surface modified aramid fiber has excellent ultraviolet resistance and is provided with a lot of active groups, in this way, the surface activity of the aramid fiber is obviously improved, and conditions are provided for further modification and application of the fiber. Meanwhile, in the process of modifying the aramid fiber, it is not needed to pretreat the aramid fiber, the preparation process is environmentally friendly, the operation technology is simple and controllable, and the surface modified aramid fiber is suitable for large-scale industrialized production.

The invention relates to one-dimensional organic semiconductor spiral nano-wires with ultra-sensitive fluorescence response upon organic amine gases, and a preparation method and an application thereof. According to the invention, perylene imide derivatives comprising perylene and with asymmetric amphiphilic substituents on two ends are adopted as construction units; in a mixed liquid of a good solvent and a poor solvent, through pi-pi interactions between perylenes of a plurality of perylene imide derivatives comprising perylene and with asymmetric amphiphilic substituents on two ends, the one-dimensional organic semiconductor spiral nano-wires are obtained through self-assembly. The one-dimensional organic semiconductor spiral nano-wires have two significant advantages of a nano-grade spiral structure and good fluorescence quantum yield (up to 25%), such that the nano-wires are suitable to be used in fluorescence detection of organic amine in air. When a network-structured porous membrane woven by using the one-dimensional organic semiconductor spiral nano-wires contacts trace amine vapour (with a concentration of ppb-ppm level), the fluorescence is quenched.

The invention discloses a method for making a carbon nano tube/polystyrene composite conductive material, which comprises the following steps of: firstly, preparing low-concentration solution of polystyrene by using a specific solvent and dispersing carbon nanotubes by using the solution of polystyrene; secondly, preparing another solution of polystyrene by using the same solvent according to the formula of the composite material, and uniformly mixing the two parts of solution; thirdly, adding a solvent, which is soluble with the solvent of the solution of polystyrene and not soluble with the polystyrene, into the mixed solution; and finally, obtaining the solid electro-conductive composite by filtering, collecting or drying. In the invention, the carbon nanotubes can be uniformly and stably dispersed by the chain winding of a polystyrene matrix material, the pi-pi interaction and the like, no auxiliary dispersing agents are added, and the post-chemical decoration dispersion is not used, so that the damages of ultrasonic treatment to the matrix are avoided, the basic structure and the performance of the matrix material are kept, and meanwhile, the purity of the composite is greatly improved. The making method of the invention has a simple operation process and obviously saves cost.

The invention relates to an organic fluorescent sensing material with high-sensitivity fluorescent response to several explosives, and a preparation method application of the organic fluorescent sensing material. The material is obtained by self-assembling one or various carbazole derivatives through pi-pi interaction. The organic fluorescent sensing material disclosed by the invention has a typical P type material characteristic and high luminous stability, is suitable for being used for performing fluorescence detection on the explosives, and is particularly very effective for the detection of trace explosives (the concentration is at the ng level).

A microfluidic system comprising a microchannel, a carrier fluid comprising a fluorinated oil in the microchannel, at least one plug comprising an aqueous plug-fluid in the microchannel and substantially surrounded on all sides by the carrier-fluid, and a fluorinated surfactant comprising a functional group capable of selectively binding a target molecule is disclosed. A compound for use therewith and a method of synthesizing a fluorinated surfactant are also provided.

The invention discloses dissolved organic matter impregnated biochar efficient in adsorbing heavy metal ions Cd2+ and a preparation method and application thereof; the dissolved organic matter impregnated biochar is prepared by supporting dissolved organic matters on the surface of biochar under Pi-Pi interaction, polar interaction and hydrogen bond and pore filling mechanism. The DOM (dissolved organic matter) impregnated biochar prepared herein is an environment-friendly adsorbent efficient in treating Cd2+-containing wastewater at low cost, and is significantly better than biochar modified via other methods and non-modified biochar in terms of Cd2+ ion adsorbing capacity; the capacity of adsorbing Cd2+ in aqueous solutions is 51.1% and above higher than that of non-impregnated biochar; in addition, the preparation method according to the invention is simple, has no need for adding other chemicals or organic solvents, has an environment-friendly process, has no need for complex chemical reactions, special equipment and severe reaction conditions, and accordingly is easy for industrial production.

The invention particularly relates to a method for fixing terpyridyl ruthenium on the surface of an electrochemical electrode, which belongs to the field of materials and electrochemical luminescence detection. The method includes: reducing graphene oxide into a graphene film with excellent conductivity on the surface of the electrochemical electrode by means of chemical reduction reaction; firmly attaching the generated graphene film on the surface of the electrode; and stably fixing the terpyridyl ruthenium to the surface of the electrode by means of pi-pi interaction. Compared with other methods, the method has the advantage that an electrochemical luminescence sensor manufactured by the method has fine electrochemical luminescence performance and excellent stability, and is simple in operation and low in cost. In addition, the graphene film is used for fixing the terpyridyl ruthenium and also serves as a substrate for loading enzyme or nanoparticles on the electrochemical luminescence sensor, so that the electrochemical luminescence sensor manufactured by the method is wide in application prospect.

The invention relates to a fluorescent material for detecting mustard gas mimics based on sulphur-pi interaction, and a preparation method and application thereof. The fluorescent material is formed by self-assembling a fluorene derivative which is as shown in the formula (I), wherein n is less than or equal to 6 and is greater than or equal to 1; A is selected from straight chain or branched chain alkyl groups of C1-12, C1-C12 alkoxy groups, -N(C1-12 alkyl groups)2, -NHC1-12 alkyl groups, -COOC1-12 alkyl groups; Rs are the same or different and are selected from C1-12 straight chain or branched chain alkyl groups independently of each other.

The invention belongs to the field of porous organic materials and in particular discloses a hydrogen bond organic framework material based on condensed ring ligand construction as well as a preparation method and application thereof. The material is prepared by taking condensed ring ligands as an organic framework by utilizing a synergistic effect of pi-pi interaction of multiple hydrogen bonds and condensed ring ligands. The condensed ring ligands are selected from carboxyl-containing poly-benzene ring conjugated aromatic hydrocarbons, and the particle size of the material is 200nm to 50 microns. The organic framework material has the characteristics of being high in specific surface area, permanent in pore channel, high in chemical and thermal stability, mild in synthesis conditions andexcellent in singlet oxygen production capacity and the like. Moreover, the material is simple in preparation method, high in operability and capable of freely controlling the particle size of particles. The material has excellent biocompatibility and low biotoxicity, has excellent compound chemical-photodynamic therapy capacity after further compounding anti-cancer drugs, and achieves an excellent cancer treatment effect, and the cancer cell survival rate is low.

The invention relates to a polymerization monomer for a donor material of a polymer solar battery. The polymerization monomer is a fused ring compound with two lactam six-membered rings, and lactams are connected through an aromatic ring. The polymerization monomer for the donor material of the polymer solar battery is the condensed ring lactam compound, so the effective conjugate length is increased; the polymerized donor material for the polymer solar battery has the characteristics of less main chain torsion, strong pi-pi interaction between chains, high molecule accumulation orderliness, and substantial improvement of the carrier mobility and power conversion efficiency of the above polymer; and the power conversion efficiency (PCE) of the obtained polymer solar battery is not less than 5%.

The invention belongs to the field of luminescent materials, and relates to a rare earth metal organic framework material and a synthesis method thereof. The rare earth metal organic framework material is constructed with deprotoned 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine as ligands, with rare earth metal ions as luminescent centers by pi-pi interaction of the ligands or C-H-pi interaction of the ligands and a solvent. The distance between the centers of aromatic rings corresponding to the pi-pi interaction of the ligands is 5 Angstroms, the interaction of the ligand molecules is enhanced,the rigidity of a material skeleton is increased, the loss of energy on the skeleton is reduced, the energy transfer from the ligands to the rare earth metals is also enhanced, the energy utilizationefficiency is greatly enhanced, and thus high quantum yield is obtained. The luminescent metal organic frame material has high energy utilization rate, and the quantum yield of the luminescent metal organic frame material is increased from less than 60% to 99.9% compared with that of a conventional rare earth metal organic frame material.

The invention discloses a tetraoxacalix[2]arene[2]triazine bonded silica stationary phase with large bonding quantity and a stable bonding layer. The concrete preparation method comprises the following steps: in the presence of anhydrous potassium carbonate, 3-aminopropyltriethoxysilane silica reacts with the tetraoxacalix[2]arene[2]triazine in N2 at the temperature of 30-90 DEG C to obtain the tetraoxacalix[2]arene[2]triazine bonded silica stationary phase. Experimental result indicates that the calixarene bonded stationary phase synthesized by the method has the characteristics of relatively large bonding quantity, stable bonding layer and the like; and the method is easy, the preparation cost is low, and the preparation method is widely applicable. The tetraoxacalix[2]arene[2]triazine bonded silica stationary phase not only has the traditional ODS (octadecylsilane bonded silica) reversed-phase chromatography performance, but also can provide sites for various actions such as complexing, hydrogen bonding, pi-pi interaction, space matching and the like. Therefore, the tetraoxacalix[2]arene[2]triazine bonded silica stationary phase can replace ODS to some degree, and provide possibility in separating substances difficult to separate at the same time.

The invention relates to one-dimensional organic semiconductor nanowire/nanoribbon with ultrasensitive (ppb grade) fluorescence response to organophosphorus ester and related organic phosphorus-containing compound toxic gases and a preparation method and application thereof. The nanowire or nanoribbon is obtained by self-assembling of various perylene-containing amphiphilic perylene bisimide derivatives through Pi-Pi interaction. The perylene-containing amphiphilic perylene bisimide derivative has asymmetric amphiphilic substituent, wherein one end is a nonpolar straight-chain or branched-chain long-chain alkyl, and the other end is aryl containing polar group or aryl alkyl. According to a film formed by weaving the one-dimensional organic semiconductor nanowires or nanoribbons, detection concentration of steam of toxic organic phosphorus-containing compounds reaches the grade of several ppb to one hundred and more ppm. The product has a great application prospect.

The invention belongs to the technical field of preparation of metal anticorrosive coatings, and in particular relates to a lignin/graphene-based composite anticorrosive coating and a preparation method and application of the lignin/graphene-based composite anticorrosive coating. The method comprises the following steps: mixing a hydroxylated lignin solution with graphite, ultrasonically strippingto prepare saturated lignin/graphene dispersion liquid, and then mixing with epoxy resin, a waterborne curing agent and a solvent to prepare the lignin/graphene-based composite anticorrosive coating.The method adopts a renewable biomass material, namely lignin, and the hydroxylation, amphiphilicity of the lignin and the Pi-Pi interaction of the lignin with graphene are used, so that hydrophobicgraphene can be uniformly dispersed in the waterborne epoxy resin to obtain the coating, and the graphene of the coating can block intrusion of small corrosive molecules layer by layer to greatly reduce corrosion paths of the small molecules, so as to delay the corrosion rate of a substrate. Furthermore, the coating further has good thermal stability and shows better capacitance arc and higher pyrolysis temperature while used for anticorrosion of metal and building material surfaces.

The invention discloses a carbon nanotube dispersant and dispersion method based on a carbazolyl conjugated polymer. The carbazolyl conjugated polymer has a structure represented by the formula as shown in the specification, wherein R is an alkyl group of C3 to C25, n is 7-70, and the number average molecular weight is 5*10<3>g/mol-5*10<4>g/mol. The carbazolyl conjugated polymer used as the carbonnanotube dispersant can be used for efficient and rapid monodispersion of carbon nanotubes (especially double-walled carbon nanotubes) in an organic phase, the conductivity of the carbazolyl conjugated polymer is better than that of a surfactant, the degree of tight packing of the carbazolyl conjugated polymer on the surface of the carbon nanotubes is much lower than that of the surfactant, conductive properties of the double-walled carbon nanotubes are less influenced, much surface of the double-walled carbon nanotubes can be more exposed, the excellent conductive properties can be fully played, meanwhile the combination of the carbazolyl conjugated polymer and the carbon nanotubes are achieved mainly through the Pi-Pi interaction, and the non-covalent effect may not cause damage to thesurface of the carbon nanotubes.

The invention discloses a preparation method and application of an azo dye adsorbent, which comprises following operating steps: first, pretreatment of graphite is carried out to obtain oxidation graphite capable of adsorbing azo dye through pi-pi interaction; and then polymine is used for chemical modification of the oxidation graphite, so that the oxidation graphite has good dispersion stability in aqueous solution. Modified oxidation graphite is used for waste water treatment containing azo dye. The preparation method and the application of the azo dye adsorbent is convenient in preparation, fast in absorption, high in efficient, wide in application scope, free of residues and adverse reactions and the like, and is expected to be widely used in the field of environmental engineering.

The invention relates to a water-soluble cationic biphenyl aromatic hydrocarbon as well as an inclusion compound and a preparation method thereof. The compound has a structural formula as shown in thedescription, wherein n is equal to 4-7. The inclusion compound is molecular aggregate formed by the steps: taking water-soluble cationic biphenyl [4] aromatic hydrocarbon as a macrocyclic host compound, taking an ATP molecule (Adenosine Triphosphate) as an individual guest molecule, enabling the ATP molecule to enter a cavity of the water-soluble cationic biphenyl [4] aromatic hydrocarbon, and forming the aggregate by virtue of electrostatic interaction and pi-pi interaction. A molar ratio of the water-soluble cationic biphenyl [4] aromatic hydrocarbon to the ATP molecule is 1 to 1. A bindingconstant measured by a thermostatic calorimetric titration experiment (ITC) experiment is (1.05+/-0.07)*10<4>M<-1>. The method has the advantages of being simple in operation and mild in reaction conditions, improves the biological stability of the ATP, and provides a new thought for reducing multidrug resistance (MDR) produced by tumor cells to anticancer drugs.

The invention discloses a rosin-based polyamine conductive epoxy hardener and a preparation method and application thereof. The preparation method includes: enabling dehydroabietic acid which is a disproportionated rosin purification product to react with polyamine, and depressurizing for distilling to remove redundant polyamine to obtain slightly-red transparent liquid rosin-based polyamine; mixing the rosin-based polyamine with a carbonaceous conductive filler to obtain the rosin-based polyamine conductive epoxy hardener. Pi-Pi interaction between rosin-based polyamine and carbonaceous conductive particles like grapheme is utilized creatively to uniformly disperse the carbonaceous conductive particles in rosin-based polyamine, so that sedimentation is avoided; the rosin-based polyamine conductive epoxy hardener prepared by the method has extremely high amine value and conductivity, and can substantially lower percolation threshold value of conductive adhesives when being applied in preparing epoxy resin conductive adhesives.

The invention discloses a rare earth supermolecular metal gel based on a fluorene-substituted phenylalanine gelator, and belongs to the field of functional materials. In the invention, the fluorene-substituted phenylalanine is dissolved in organic solvent and is coordinated with rare earth ions, so that under the pi-pi interaction and hydrogen bond interaction of the fluorene-substituted amino acid, the rare earth supermolecular gel is self-assembled; the gel has the specific fluorescent characteristic of the rare earth and is high in luminescent intensity and fluorescent efficiency; the rareearth supermolecular gel has excellent heat resistance, and can hold the gel state and maintain the fluorescent intensity even at 30-100 DEG C. The fluorescent intensity has excellent reversible responsibility to acid and alkali and can be maintained even after multiple-time circulation. The preparation method of the rare earth supermolecular gel is simple and quick and is free of heating treatment, wherein the gelator is easy to obtain and biocompatibility is excellent. The invention extends the application of the rare earth supermolecular gel in the fields such as high-end anti-fake, sensors, and biomedical treatment, etc.

The invention relates to a monodisperse laser-responsive photoinducedly-movable one-dimensional organic semiconductor microbelt which can convert luminous energy into mechanical energy at a microscopic scale so as to make other things work, and a preparation method and application thereof. The one-dimensional organic semiconductor microbelt is obtained through self-assembly of a plurality of perylene bisimide derivatives having same substituents at two ends and containing 3,4,9,10-perylenetetracarboxylic dianhydride in virtue of pi-pi interaction among 3,4,9,10-perylenetetracarboxylic dianhydride. In the absorption wavelength range of a construction monomer molecule and under irradiation by laser with laser intensity density of greater than or equal to 40 mW/cm2, the one-dimensional organic semiconductor microbelt continuously moves on the surface of a hydrophobic substrate under excitation, and the moving manner of the microbelt is directly related to the structure of construction monomers composing the one-dimensional organic semiconductor microbelt while the moving speed of the microbelt is directly related to provided laser intensity density. Thus, the moving manner of the one-dimensional organic semiconductor microbelt can be controlled by adjusting the structure of construction monomers composing the one-dimensional organic semiconductor microbelt.

The invention discloses a hollow mesoporous molecularly imprinted polydopamine nanoparticle adsorbent of a pomegranate-like structure and a preparation method and application thereof. Dopamine is adopted as a functional monomer, Pluronic F-127 and 1,3,5-trimethylbenzene (TMB) are adopted as organic pore forming agents, and a template molecule is imprinted in a material. An organic-organic self-polymerization approach is adopted, and on the basis of the Pi-Pi interaction between 1,3,5-trimethylbenzene droplets and polydopamine (PDA) particles formed by self-polymerization of the dopamine, a mesoporous molecularly imprinted polymer having a memory function for a stereoscopic structure of the template molecule is obtained through synthesis. The mesoporous molecularly imprinted polymer is usedas a dispersed solid-phase extraction adsorbent and used for enriching and selectively separating an analyte, and in combination with HPLC-MS/MS detection, a good effect is achieved. The preparationmethod is simple, the adsorption capacity and the mass transfer rate are high, the selectivity is great, the service life is long, and the adsorbent has a broad application prospect in the fields of analytical chemistry and environmental analysis.

The invention discloses a method for efficiently preparing a graphene nanosheet material dispersed in natural polysaccharides and a preparation method of a graphene nanosheet dispersion liquid. The graphene nanosheet material is dispersed into the natural polysaccharides and can be stably dispersed into water for a long time when the polysaccharides are removed. According to the method for efficiently preparing the graphene nanosheet material dispersed in the natural polysaccharides, the natural polysaccharides and solid graphene are mixed and directly mechanically ground in an oxygen atmosphere to obtain the monolayer or multilayer graphene nanosheet composite material dispersed in the natural polysaccharides with a thickness of 0.33 nm-0.9 nm. According to the prepared graphene nanosheet material, the natural polysaccharides serve as the dispersing agent and are dispersed around graphene nanosheets; in the oxygen atmosphere, the graphene nanosheets and the natural polysaccharides interact with each other on the interface by Van der Waals' force and CH-pi interaction and meanwhile react chemically with each other, so that the graphene stripping efficiency can be effectively improved from 10% to 80%.