703 results about "Oxygen atom" patented technology

The invention discloses a zinc-bromine flow battery multifunctional negative electrode electrolyte and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, and the method comprises the following steps: uniformly stirring and mixing a solvent, deionized water and a cosolvent, adding an electrolyte, stirring until the electrolyte is completely dissolved, then adding a supporting electrolyte and a negative electrode additive, stirring until the supporting electrolyte and the negative electrode additive are completely dissolved, and obtaining the zinc-bromine flow battery multifunctional negative electrode electrolyte. The multifunctional negative electrode electrolyte of the zinc-bromine flow battery is obtained; the negative electrode cosolvent is dimethylformamide; and the negative electrode additive is at least one of saponin and cinnamyl aldehyde. Saponin molecules are adsorbed on the surface of the zinc electrode, and electronegative carboxyl groups of the saponin molecules form an electrostatic repulsion net in an electric double layer, so that zinc ions are forced to be uniformly dispersed, local ion concentration hot spots are eliminated, and dendritic crystal nucleation is inhibited from the source. In cinnamyl aldehyde, the strong electronegativity of oxygen atoms and the electronegativity of aldehyde oxygen are far higher than those of hydrogen, so that electrons are strongly attracted, adjacent carbon atoms are positively charged, polar adsorption sites are formed, the hydrogen evolution reaction is effectively inhibited, and the stability and the cycle life of the battery are greatly improved.

The invention provides an Al-RE rare earth alloy powder fuel forming an oxygen diffusion channel at a grain boundary, which is characterized in that a rare earth intermediate alloy Al-RE is added into a pure Al melt, alloying is carried out, and a solidification structure capable of diffusing oxygen atoms is formed after supersonic atomization of an inert gas atomization system, non-equilibrium cooling and staged treatment. In the high-temperature oxidation environment, the rare earth alloy powder fuel is oxidized, meanwhile, the grain boundary also starts to be oxidized, oxygen is diffused from the surface of the powder to the interior, an oxygen diffusion channel and a microstructure are formed through grain boundary oxidation, and complete oxidation combustion is achieved. The micron-sized powder fuel with the oxygen diffusion channel formed at the crystal boundary in the alloy powder fuel is low in production cost and easy to store, and has the advantages of reaction characteristics of nano-particle powder and high combustion efficiency. And due to the existence of an oxygen diffusion channel in the powder, internal crystal grains can be oxidized to a great extent, and almost no unburned residue exists, so that the combustion efficiency and the economic benefit of the fuel are improved, and the propelling capacity of the fuel is also greatly improved.

An electrolyte solution for a lithium secondary battery, including a first solvent comprising a heterocyclic compound having at least one double bond, and any one of an oxygen atom and a sulfur atom; a second solvent including at least one of an ether-containing compound, an ester-containing compound, an amide-containing compound, and a carbonate-containing compound; a lithium salt; lanthanum nitrate; and an additive including lithium nitrate.

This application discloses a nonaqueous electrolyte solution, a secondary battery containing the nonaqueous electrolyte solution, and an electrical device. The nonaqueous electrolyte solution includes: a compound A including a saturated five-membered ring or six-membered ring and at least one fluorine-containing substituent, where the ring contains 1 or 2 oxygen atoms as ring atoms, and a ring carbon atom connected to the oxygen atom in the ring is not directly replaced by fluorine; and a compound B including a saturated five-membered ring or six-membered ring that contains 1 or 2 oxygen atoms as ring atoms, where at least one ring carbon atom connected to the oxygen atom in the ring is directly replaced by at least one fluorine atom. The nonaqueous electrolyte solution can improve cycle performance and low-temperature discharge capabilities of the secondary battery.

Methods and systems for the electrochemical epoxidation of alkenes to generate an epoxide are described herein. Said methods and systems comprise: contacting an anode comprising an oxygen atom transfer electrocatalyst with an alkene in the presence of an electrolyte comprising water; applying a voltage to the anode and a cathode to generate the epoxide; wherein the oxygen atom transfer electrocatalyst comprises an at least partially oxidized palladium-platinum alloy characterized by the formula FX1: PdyPtzOx; wherein y is greater than 0 and less than 1; z is greater than 0 and less than 1; wherein the sum of y and z is equal to 1; and x is selected from the range of 0 to 2. The methods and systems disclosed herein comprise a significant advancement in the electrocatalytic epoxidation of alkenes in aqueous and mixed electrolytes using water as the oxygen atom transfer source.

The invention provides a crystal pulling method for improving the BMD defect density in monocrystalline silicon and a monocrystalline silicon rod, and belongs to the technical field of monocrystalline silicon crystal pulling, and particularly relates to the following steps: stabilizing the oxygen content in a crystal in a relatively high interval by cooperatively regulating and controlling the argon flow, the furnace pressure, the crucible rotating speed, the crystal rod rotating speed and the pulling speed, providing a sufficient oxygen source for generation of BMD defects, and improving the BMD defect density in the monocrystalline silicon on the basis of stabilizing the oxygen content in the crystal in a relatively high interval. In the equal-diameter process, temperature compensation is carried out on a crystal bar through a preset temperature compensation device, diffusion and precipitation of oxygen atoms are effectively promoted to form BMD crystal nucleuses, the BMD body defect density and the axial distribution uniformity are remarkably improved, the specification lower limit of the BMD density is promoted to be improved to 1.0 E + 11 ea / cm < 3 > or above, the internal gettering capacity of a silicon wafer is finally enhanced, and the service life of the silicon wafer is prolonged. And a reliable guarantee is provided for improving the performance and yield of the device.

In one form of the present disclosure, a quantum sensor comprises a quantum device. The quantum device comprises gallium nitride (GaN) with a color center with a zero-phonon line (ZPL) between about 900 nanometers (nm) and about 990 nm. The GaN can be doped with silicon (Si) and have low carbon (C) and oxygen (O) impurities. In one example, the quantum device is GaN doped with about 1016 atoms of Si per cm3, having less than about 8×1015 C atoms per cm3 and less than about 6×1015 O atoms per cm3, and a Ga vacancy density less than about 1016 vacancies per cm3.

The utility model discloses a safety type active water molecule electrolysis device which comprises a shell with an air flow channel, a membrane electrode assembly is arranged in the shell, the membrane electrode assembly divides the air flow channel into an air inlet end and an air outlet end, the anode side of the membrane electrode assembly faces the air inlet end, the cathode side of the membrane electrode assembly faces the air outlet end, and the air outlet end faces the air outlet end. The air inlet end is provided with a pure iron foil for air flow to pass through, the pure iron foil absorbs oxygen generated by electrolyzing water molecules on the anode side of the membrane electrode assembly, and the exhaust end is provided with an ePTFE microporous breathable protective film. Through the mode, the safe active water molecule electrolysis device and equipment can absorb oxygen in the equipment, so that the oxygen content is in a lower state, the corrosion damage of oxygen-enriched atoms is avoided, and the spontaneous combustion risk caused by over-high internal oxygen concentration is avoided.

A paste that includes particles of a layered material in an ammonia aqueous solution. The particles include one or plural layers, the layers having a layer body represented by MmXn, wherein M is at least one metal of Group 3, 4, 5, 6, or 7, X is a carbon atom, a nitrogen atom, or a combination thereof, n is not less than 1 and not more than 4, and m is more than n but not more than 5, and a modifier or terminal T exists on a surface of the layer body, wherein T is at least one selected from the group consisting of a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom, wherein the paste has a viscosity of 1 Pa·s or more at a shear velocity of 1 / s when the paste has a solid content concentration of 1.0% by mass.

The invention discloses a method for improving the oxidation resistance of nickel-based superalloy, and belongs to the technical field of metal material surface modification. Based on the high-energy transient effect of laser shock waves, the method mainly comprises the key steps of alloy surface pretreatment, laser shock peening process implementation, post-treatment and the like. Specifically, firstly, the surface of the nickel-based single crystal alloy is subjected to pretreatment such as polishing and cleaning, surface defects and pollutants are removed, and the treatment quality is guaranteed; then, according to the material characteristics and performance requirements of the nickel-based single crystal alloy, laser parameters such as laser energy, pulse width and light spot diameter are accurately set, and proper restraint layer and absorption layer materials are selected; then, high-energy pulse laser is utilized to irradiate the absorption layer, high-temperature and high-pressure plasma is induced to be generated, the plasma expands and explodes to generate strong shock waves, the shock waves act on the alloy surface, the surface material is subjected to severe plastic deformation, a residual compressive stress layer with the depth capable of reaching hundreds of micrometers is formed, meanwhile, surface grains are refined, and the microstructure is optimized; and after the strengthening treatment is completed, simple cleaning and performance detection post-treatment are carried out. Through laser shock strengthening, a special organization structure with high density and low defect density is formed on the surface of the nickel-based single crystal alloy, diffusion and invasion of oxygen atoms are effectively hindered, and the oxidation resistance of the alloy is remarkably improved. According to the method, the controllability of technological parameters is high, the strengthening effect can be accurately regulated and controlled, the treatment process is free of pollution and high in efficiency, the obtained strengthened nickel-based single crystal alloy can be widely applied to the fields such as aerospace engine hot end parts and nuclear energy equipment which have strict requirements for high-temperature oxidation resistance, the reliability of related parts is greatly improved, and the service life of the related parts is greatly prolonged.

A compound has a molecular weight of 500 to 5,000 and is composed of a hydrogen atom, a carbon atom, and a hetero atom. The hetero atom is at least one selected from an oxygen atom, a sulfur atom, a fluorine atom, and a silicon atom, and has one or more alicyclic structures, one or more aromatic ring structures directly bonded to the alicyclic structures, and one or more monovalent substituents Ms directly bonded to the aromatic ring structures. The monovalent substituent Ms is at least one substituent selected from a group containing a monovalent fluorine-containing aliphatic group, a group containing a monovalent sulfur fluoride-containing group, a group containing a monovalent siloxanyl group, and a group containing a monovalent saturated hydrocarbon group.

The present application provides a negative electrode plate, an electrochemical device and an electronic device of a sodium ion battery, wherein the negative electrode plate includes a negative electrode current collector, a carbon material coating formed on at least a portion of the surface of the negative electrode current collector, and a sodium metal layer formed on at least a portion of the surface of the carbon material coating away from the negative electrode current collector, the thickness of the carbon material coating is less than or equal to 10 μm, the carbon material coating includes a carbon material and a polymer binder, the carbon material includes an oxygen-containing group, and the mass content of oxygen atoms in the carbon material is ≥ 0.1%. The negative electrode plate of the sodium ion battery provided by the present application deposits metallic sodium on the surface of the negative electrode current collector during the first charge, and the metallic sodium formed by the deposition can adhere to the carbon material coating on the surface of the negative electrode current collector, and the carbon material coating can effectively reduce the overpotential of sodium metal deposition, inhibit the formation of sodium dendrites, and is conducive to improving the cycle performance of the battery.

The invention provides an energy storage lithium ion battery high-temperature storage electrolyte additive, an electrolyte and a battery, and belongs to the technical field of lithium ion batteries, molecules of the electrolyte functional additive contain P = O groups, and oxygen atoms in the groups have high electronegativity and can generate complexation with transition metal ions. In the high-temperature storage process of the lithium ion battery, the complexing action can effectively inhibit the dissolution of transition metal ions and reduce a series of adverse effects caused by the dissolution of the transition metal ions, so that the self-discharge phenomenon of the battery during high-temperature storage is improved, and the high-temperature storage capacity retention rate is remarkably increased; and the performance of the battery in a high-temperature environment is improved fundamentally.

This reactive silicon group-containing organopolysiloxane, which contains, per molecule thereof, one group represented by structural formula (1) and bonded to a silicon atom at the end of a linear organopolysiloxane, forms a film having excellent water repellency, water sliding properties, and durability. (In the formula, R1 and R2 each independently represent a hydrogen atom, a C1-C10 aliphatic saturated hydrocarbon group, or a C6-C10 aryl group, R3s each independently represent a C1-C10 aliphatic saturated hydrocarbon group or a C6-C10 aryl group, Z represents an oxygen atom, a C2-C12 alkylene group, or a C8-C12 alkylene arylene group, and a line with a wavy line represents a bond.)

The present invention relates to a silicon-carbon mixture, a method for preparing same, and a negative electrode active material and a lithium secondary battery comprising same. The silicon-carbon mixture includes two or more kinds of composites, comprises silicon particles, magnesium silicate, and carbon, and has a molar ratio of oxygen (O) atoms to silicon (Si) atoms (O / Si) that satisfies 0.06 to 0.90. Accordingly, when the silicon-carbon mixture is applied to a negative electrode active material, it is possible to simultaneously enhance the discharge capacity, initial efficiency, and capacity retention rate after cycles of a lithium secondary battery.

The invention discloses an electrolyte additive, an electrolyte and a battery, the electrolyte additive comprises a first additive and a second additive, the first additive comprises a compound shown as a formula 1: # imgabs0 #, R1 and R2 are respectively and independently selected from at least one of H, phenyl, halogen, C1-C6 alkyl, C1-C6 halogenated alkyl and # imgabs1 #, and R1 and R2 are not H at the same time; r3, R4 and R5 are respectively and independently selected from at least one of C1-C3 alkylene groups, oxygen atoms, O = S = O, C = O and S = O, at least one of R3, R4 and R5 is selected from O = S = O, C = O and S = O, and at least one of R3, R4 and R5 is selected from oxygen atoms; and the second additive comprises a compound shown as a formula 2: # imgabs2. The electrolyte additive is added into the electrolyte of the battery, so that the fast charging performance of the battery can be improved, and the high-temperature cycle performance can be improved.

To provide a resist composition or the like that is superior in all of sensitivity, roughness, and resolution.SOLUTION: The present invention provides a resist composition that generates an acid upon exposure and that changes solubility in a developer solution due to the action of the acid, the resist composition comprising a compound containing a cation (C0) represented by general formula (c0). [In the formula, Y0 represents a polar group containing an oxygen atom. Rf0 represents a fluorine atom or a fluorinated alkyl group. R01 represents a substituent (excluding a polar group containing an oxygen atom, a fluorine atom, and a fluorinated alkyl group), and R02 and R03 each independently represent a substituent (excluding an iodine atom)].SELECTED DRAWING: None

This nonspecific reaction inhibitor is a copolymer containing a first repeating unit represented by formula (1) and a second repeating unit represented by formula (2). In formula (1), R1, R2, and R3 are each independently a hydrogen atom or a methyl group, X is NH or an oxygen atom, Y is SO3 - or COO-, and Yn and m are each independently an integer from 1 to 5. In formula (2), R4 is a hydrogen atom or a methyl group, Z is NH or an oxygen atom, and A is a linear or branched alkyl group with 12 to 40 carbon atoms.

The invention discloses a fluorescent probe for monitoring formaldehyde, a preparation method, application and a portable sensor. The structural formula of the fluorescent probe for monitoring formaldehyde is shown as a formula (I): # imgabs0 #, in which R1 is selected from any one of C1-C2 alkyl, phenyl and substituted phenyl; the substituted phenyl is preferably selected from alkyl substituted phenyl, and more preferably selected from C1-C3 alkyl substituted phenyl; r2 is selected from any one of oxygen atoms and sulfur atoms; r3 is selected from any one of cyano and carboxyl; a is selected from any one of a group shown in a formula (II) and a group shown in a formula (III): # imgabs No.1. The fluorescent probe provided by the invention has relatively strong fluorescence emission performance in both solution and solid states, can be used for monitoring formaldehyde in real time and has relatively high sensitivity and selectivity, and the preparation method of the fluorescent probe provided by the invention is simple in process, convenient to operate and suitable for industrial production. Control is easy, and cost is low.

The invention discloses a preparation method of a solar cell, the solar cell and a photovoltaic module. The preparation method of the solar cell comprises the following steps: forming an emitter on one surface of a silicon substrate; preparing a tunneling layer and an intrinsic amorphous silicon layer on the other surface of the silicon substrate; sequentially and alternately preparing a plurality of ultrathin oxide layers and intrinsic amorphous silicon layers on the surface of the intrinsic polycrystalline silicon layer; diffusing the intrinsic amorphous silicon layer to form a doped amorphous silicon layer; and annealing treatment is carried out on the doped amorphous silicon layer, so that amorphous silicon is converted into polycrystalline silicon, oxygen atoms and silicon atoms in the polycrystalline silicon layer are combined to form Si-O bonds, and the doped polycrystalline silicon layer containing the oxygen element is formed. Part of Si-O bonds in the ultrathin oxide layer are broken through the annealing process, oxygen is diffused into the doped amorphous silicon layer, the doped polycrystalline silicon layer containing the oxygen is formed, an oxygen source does not need to be additionally introduced, and the preparation process of the polycrystalline silicon layer containing the oxygen is simplified.

A negative electrode material for secondary battery use includes silicon-containing particles and coating layers covering at least part of the surfaces of the silicon-containing particles. The silicon-containing particles each include an ion conductive phase and silicon phases dispersed in the ion conductive phase. The coating layers contain at least one phosphate compound selected from the group consisting of a phosphate compound, a polyphosphate compound, and a metaphosphate compound, each of which contains an anion represented by general formula (1):In general formula (1), A represents an organic group or an oxygen atom.

A low-temperature etching method including an etching step of setting the temperature of a member to be etched having an etching object containing silicon to 0° C. or less, bringing an etching gas containing an etching compound into contact with the member to be etched, and etching the etching object. The etching gas contains or does not contain high-boiling-point impurities, the high-boiling-point impurities being compounds having at least one type of atom among a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a hydrogen atom, and an oxygen atom in the molecule and having a boiling point of 20° C. or more under a pressure of 101 kPa, and, when the etching gas contains the high-boiling-point impurities, the total concentration of all types of the contained high-boiling-point impurities is 500 ppm by volume or less.

An object is to provide a method for producing a magnetic disk that employs a fluorine-based solvent which has a low global warming potential and in which solubility of a high-polarity perfluoropolyether compound is excellent. This object is achieved by a method for producing a magnetic disk, the method including the step of applying, to a magnetic disk substrate, a lubricant solution containing a lubricant and a hydrofluoroether having a 100-year global warming potential value of less than 1000 and having a structure represented by the following Formula (A):where: Ra represents F, CF2-Re, or CF3; Rb represents O-Rd or C(-Rf)3; Rc represents H, F, or CF3; Re and Rd each independently represent a hydrocarbon group which may be partially substituted by a fluorine atom and each have a main chain in which at least one carbon atom may be replaced by an oxygen atom; and Rfs each independently represent H, F, or a hydrocarbon group that may be partially substituted by a fluorine atom, and the hydrocarbon group that may be partially substituted by the fluorine atom has a main chain in which at least one carbon atom may be replaced by an oxygen atom.

The invention discloses a high-strength plastic titanium alloy and a preparation method thereof, and belongs to the technical field of titanium alloy materials. The structure of the titanium alloy is single equiaxed beta-Ti grains, and the titanium alloy comprises the following components: 23-25% of Nb, 5-8% of Zr, 2-5% of Sn, 0.5-1.5% of O and the balance of Ti and inevitable impurity elements. The preparation method comprises the steps of alloy casting, multi-stage homogenizing annealing, multi-pass DSA rolling, aging treatment, warm rolling, surface supersonic particle bombardment and the like. Oxygen atoms are introduced to form a local chemical ordered structure, dispersion strengthening of nano-particles is induced, a texture, a surface nanocrystalline layer and the like are controlled, and the strength-plasticity inversion problem of the beta titanium alloy is solved. The yield strength of the obtained titanium alloy reaches 1124 MPa, the elongation percentage is 14%, the titanium alloy has low elastic modulus and high biocompatibility and is suitable for the biomedical field, and the preparation method of the titanium alloy has reference value for improving the performance of other metal materials.

A fluorine-containing ether compound is provided which is represented by the following formula: R1—R2—CH2—R3a—CH2—R4a—CH2—R3b—CH2—R4b—CH2—R3c—CH2—R5—R6 (R3a, R3b, and R3c are perfluoropolyether chains; R2, R4a, R4b, and R5 are a divalent linking group having at least one selected from the group consisting of a hydroxyl group, an amino group, a carboxy group, and a sulfo group; R2 has an oxygen atom at an end that is bonded to R1; R5 has an oxygen atom at an end that is bonded to R6; R1 and R6 are an organic group having 1 to 50 carbon atoms or a hydrogen atom, and at least one of them is a group in which a cyano group is bonded to a carbon atom of an organic group having 1 to 8 carbon atoms).

The invention discloses a solar cell boron emitter and a preparation method and application thereof, and belongs to the field of solar cells, after a monocrystalline silicon wafer is selected, cleaned and textured, a first BSG layer, a silicon oxide mask layer and a second BSG layer are sequentially deposited on the front surface of the silicon wafer, and then annealing treatment is carried out; wherein the boron atom concentration of the first BSG layer is lower than that of the second BSG layer, and the oxygen atom concentration of the first BSG layer is higher than that of the second BSG layer. The BSG layer with low-concentration boron atoms and high-concentration oxygen atoms, the silicon oxide mask layer and the BSG layer with high-concentration boron atoms and low-concentration oxygen atoms are sequentially deposited on the silicon wafer, and after annealing treatment, the surface of the formed boron emitter has high boron doping concentration and can be in better contact with a metal electrode; and meanwhile, the junction depth of the boron emitter is relatively shallow, defects caused by internal boron doping can be repaired due to existence of high-concentration oxygen atoms, and compounding of a silicon substrate is reduced.

The invention discloses a compound and a preparation method thereof and an electronic device, the molecular structure general formula of the compound is shown in the specification, R is selected from one of the following structures, X1-X2 are respectively and independently selected from one of oxygen atoms, sulfur atoms, selenium atoms and nitrogen atoms, and X is a positive integer. X < 3 > to X < 4 > are respectively and independently selected from one of the following structures; and X < 5 > to X < 6 > are respectively and independently selected from any one of alkyl groups. According to the compound provided by the invention, the electron pushing and pulling capability in the compound is adjusted by changing the structures of a donor and an acceptor, so that the purpose of regulating and controlling molecular electron cloud distribution and energy level is achieved, and key physical properties such as emission wavelength, radiative transition rate (kr) and backlash crossing rate (kRISC) of a material are systematically regulated and controlled. The compound as a guest material of a luminescent layer has good comprehensive performance when being applied to organic electroluminescent devices for solution processing and vacuum evaporation.

The invention belongs to the technical field of lithium metal batteries, and particularly relates to a siloxane electrolyte, a preparation method thereof and application of the siloxane electrolyte in a low-temperature lithium metal battery. The siloxane electrolyte is prepared from a lithium salt and dimethoxy dimethyl silane, and the mass ratio of the lithium salt to the dimethoxy dimethyl silane is (0.16 to 0.48) to (0.5 to 1.5). The siloxane electrolyte composition provided by the invention comprises the lithium salt and the dimethoxydimethylsilane, and silicon atoms and adjacent oxygen atoms in the dimethoxydimethylsilane have a d-p conjugation effect, so that the high voltage resistance of the electrolyte is effectively improved, the Li < + >-solvent interaction can be weakened, and the release of lithium ions in the desolventizing process is promoted; by combining a low-temperature formation mode, the electrochemical performance of the lithium battery in a low-temperature interval can be remarkably improved, the lithium battery can be matched with a ternary positive electrode and stably run under the condition of 4.7 V, and the lithium battery has an excellent low-temperature capacity retention rate and has a wide application prospect in the low-temperature lithium metal battery.

The invention provides a monomer and a preparation method thereof, a flame-retardant gel electrolyte precursor and a preparation method thereof, and a battery. The monomer provided by the invention is shown as a formula (2), when the monomer is used in a flame-retardant gel electrolyte precursor, a phosphorus-containing flame-retardant polymer network with a new structure can be obtained through in-situ polymerization, and a polymer skeleton does not contain oxygen atoms, is higher in thermal stability and achieves a better flame-retardant effect; moreover, the monomers can be thermally initiated and polymerized in situ, so that a stable tight interface is formed between the electrolyte gel and the positive and negative electrodes, and lower interface impedance is realized. According to the flame-retardant gel electrolyte precursor provided by the invention, the monomer as shown in the formula (2), the lithium salt and the ionic liquid are subjected to in-situ polymerization in the battery to obtain a phosphorus-containing flame-retardant polymer network with a new structure, and the phosphorus-containing flame-retardant polymer network is matched with certain ionic liquid gel and the lithium salt, so that the thermal stability of the battery is further improved; and the ionic conductivity and the ionic transference number are improved, and the cycle performance of the battery is improved.

The present invention addresses the problem of providing a polysiloxane which enables the production of a photosensitive resin composition yielding a cured product that can be processed with high resolution and has high flexibility. The present invention is a polysiloxane that includes one or more structures selected from the group consisting of structures represented by formulae (1) to (3). In formulae (1) to (3), R1s each independently represent a group represented by formula (4); R2 represents a hydrocarbon group having 1-4 carbon atoms; R3 represents a monovalent hydrocarbon group having 1-6 carbon atoms; *1 represents a bonding point bonded to an oxygen atom; and *2 represents a bonding point bonded to a hydrogen atom or a silicon atom. In formula (4), *3 represents a bonding point bonded to a silicon atom; R4 represents a divalent hydrocarbon group having 1-6 carbon atoms; and R5 and R6 each independently represent a group having 1-6 carbon atoms and consisting only of hydrogen atoms, carbon atoms, oxygen atoms and nitrogen atoms, wherein at least one of R5 and R6 represents a group containing an aliphatic carbon-carbon unsaturated bond.