JP3476497B2 - Method for producing silica carrier having excellent dispersibility - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a silica-supported material in which various supported materials are dispersed and supported on a porous silica material in a highly dispersed state uniformly at the molecular level.

[0002]

2. Description of the Related Art Inorganic compounds such as silica and alumina are used in a wide range of fields as catalyst carriers, fine particle dispersion media, dispersion / immobilization carriers for functional organic compounds such as dyes and enzymes, etc. by utilizing their porous structure. Has been done. Among them, the silica carrier functions to highly disperse and stabilize the supported material in order to effectively exhibit the functions and actions of the supported material or the dispersed material (hereinafter, collectively referred to as the supported material). do. For example, in the case of a carrier for a noble metal catalyst such as platinum, the catalytically active component is dispersed and carried in the form of fine particles, and it has the effect of increasing the amount of platinum with which the surface effective for catalytic reaction is exposed, that is, the surface area of platinum. In addition, the platinum fine particles are stabilized by suppressing the growth of the platinum particles caused by the fusion of the supported platinum particles during the reaction and maintaining the effective surface area.

Further, a dye compound such as porphyrin, which has been attracting attention as an optical functional material for optical recording utilizing laser oscillation or PHB phenomenon, has a strong self-association property and therefore even in a medium such as a dilute solution. It forms a molecular association and causes concentration quenching. As a result, the original function is not fully exerted. Therefore, in order to suppress the association of compounds such as dyes, it is necessary to disperse these compounds at the molecular level in a silica-based dispersion-immobilized carrier and further incorporate them into a silica network to suppress re-association and improve the function. Is being considered. As a method for producing a silica-supported material by dispersing and fixing the supported material on a silica carrier, a method of impregnating silica with a solution prepared by dissolving or dispersing a supported material or a supported-material precursor and drying it is known. ing. When impregnated with the supported material precursor, chemical treatment or thermal treatment is performed after impregnation, if necessary. The dispersion state of the obtained supported material is influenced by the pore structure and surface characteristics of silica used as a carrier. Therefore, highly dispersed support cannot be carried out.
Further, since the supported material is unstable, the desired supporting effect may not be effectively exhibited due to fusion, recombination and the like.

In order to improve the supported state, a method of converting the supported material into a cationic compound by utilizing the ion exchange reactivity of the silanol group SiOH on the surface of the silica carrier, or a cationic compound as the supported material And a method in which a silica carrier is impregnated with a solution of these cationic compounds to carry the solution. However, according to these methods, the supported substance is limited to the cationic compound.
In addition, the supported amount is limited by the silanol groups on the surface of the silica carrier, and a high supported amount cannot be maintained.

It is also known to use, as a carrier component, a silica compound such as fumed silica which can be dissolved and dispersed in a solvent, or a silica-forming compound such as alkoxysilane or sodium silicate. In this case, a uniform mixed solution or sol of the carrier component and the supported material is prepared, and the sol is chemically or thermally treated to be gelated, and the solvent is removed. In this method, the supported material may be in an associated state or an aggregated state, or the supported material may be associated or aggregated when the silica-forming compound or the like is gelated. When an amphipathic substance such as a surfactant is added to the mixed solution or sol, the association state or the aggregation state of the supported material such as the dye is eliminated. However, even if an amphipathic substance such as a surfactant is added, a sufficient effect can not be obtained in molecularly dispersing a supported material such as a dye in a silica carrier.

[0006]

In order to sufficiently and effectively exhibit the functions of supported components such as catalyst components and dyes, a silica carrier has a function of holding them in a highly dispersed and stable state. Required to have. However, when the conventional method for producing a supported material is used, it is not sufficient to make the supported material highly dispersed. Further, since the pore structure of silica cannot be controlled, there is a problem in the dispersed state. As a solution to such a problem, the present inventors propose a method for producing an organic silica thin film and a porous body having a controlled pore structure from a mixed dispersion liquid of an amphipathic substance and an alkoxysilane substance. 1-1
No. 31478 and Japanese Patent Application No. 2-414138. In this proposal, the pore structure such as the morphology and distribution of pores such as silica is controlled by using a molecular assembly formed by an amphipathic substance and having regularity at the molecular level and high stability as a template. The present invention is a further development of the method proposed in the prior application, and is carried on a silica carrier by utilizing the ion exchange property of an amphipathic substance that forms a regular molecular assembly at the molecular level. The object is to highly disperse and support the substance.

[0007]

In order to achieve the object, the present invention utilizes the template effect and the ion exchange property of the molecular assembly formed by the amphipathic substance. The silica-supported material is manufactured through the following steps. First,
A silica composite containing an amphipathic substance obtained by removing a solvent by evaporation from a mixed dispersion liquid containing an amphipathic substance having a polar group and a hydrophobic group respectively added to both ends of a molecule and a silica-forming substance such as alkoxysilane. Prepare the body. Then, the silica composite is brought into contact with an aqueous solution containing an ionic supported substance or a supported substance precursor. Examples of the contact method include a method of immersing the silica composite in an aqueous solution and a method of applying the aqueous solution to the silica composite. The supported material or the precursor of the supported material that has been subjected to the contact treatment is introduced into the surface and the inside of the silica composite by the ion exchange action of the amphipathic substance, and supported and immobilized. When the supported substance precursor is introduced, the supported substance precursor is converted into the target supported substance by performing chemical treatment or thermal treatment in the presence of an amphipathic substance. If necessary, the amphipathic substance is removed by solvent extraction or the like to obtain a silica-supported material.

For the preparation of the silica composite, etc., Japanese Patent Application No.
The method introduced in No. 21478, Japanese Patent Application No. 2-414138, etc. can be adopted. For example, in a mixed dispersion liquid of an amphipathic substance and a silica-forming substance, a metal alkoxy substance of a metal M such as Ti or Al other than Si that produces a metalloxane bond M-O-Si can be reacted with an alkoxysilane substance or the like. Can be further included as a compound. In addition, as introduced in the previous application, residual SiOR and S
In order to accelerate the hydrolysis polycondensation reaction of iOH or the like, the silica composite obtained by removing the solvent from the mixed dispersion liquid may be subjected to a chemical treatment or a thermal treatment. The chemical treatment or the thermal treatment may be performed on the silica composite before being brought into contact with the supported material or the solution containing the supported material precursor, but it is more preferable to perform the treatment on the silica composite after the contact processing. It is effective.
It is more effective that the amphipathic substance to be used is a compound capable of forming a bilayer film in consideration of the pore characteristics of the obtained porous silica material and the dispersibility of the supported material.

[0009]

The amphipathic substance in which a polar group and a hydrophobic group are added to both ends of the molecule, when dissolved or dispersed in a medium such as an aqueous solution, spontaneously forms a molecular assembly in the medium. The formed molecular assembly has a stable structure showing high regularity at the molecular level. When the sol-gel method is applied using this molecular assembly as a template, organosilica whose pore structure is controlled from a mixed dispersion liquid of an amphipathic substance and an alkoxysilane substance,
A silica thin film, a silica porous body, etc. (hereinafter, referred to as a silica porous body) are manufactured. It was speculated that a high carrier effect would be obtained when the unique pore structure of the obtained silica porous material is used for the dispersion immobilization or dispersion-support immobilization of the supported material, and thus earnest research was conducted on the loading method and the like. As a result, the present invention has been completed.

A porous silica material is disclosed in Japanese Patent Application No. 1-131478.
It is prepared according to the method introduced in Japanese Patent Application No. 2-414138. The supported object supported on the silica porous material is
As long as it has ion exchange reactivity with amphiphiles,
There is no particular limitation, and there are various substances such as inorganic compounds such as metals, metal oxides and metal sulfides, and functional organic compounds such as pigment compounds and metal complexes. Further, when it is difficult to directly support the target supported material, a precursor compound that forms the supported material may be first supported, and then a chemical treatment or a thermal treatment for converting the precursor compound into the target supported material may be performed. preferable. This chemical treatment or thermal treatment does not restrict the present invention and is appropriately selected according to the supported material precursor. The molecular assembly of the amphipathic substance exhibits an ion exchange action while maintaining its inherent molecular organization. For example, a thin film obtained by spreading a dispersion liquid of an amphipathic substance having a high ability to form a bilayer on a substrate and then evaporating the solvent from the dispersion has a self-supporting property, and the bilayer film has a two-dimensional plane. It has a multi-layered bilayer film structure that grows and is laminated. When this multilayer bilayer membrane is brought into contact with an ion-containing aqueous solution, if the hydrophilic group of the amphipathic substance is an ion pair type, the ion exchange reaction proceeds while maintaining the multilayer bilayer structure, and the dissociated ionic species Ions corresponding to the charges are taken into the inside of the multilayer bilayer thin film in a substantially stoichiometric manner.

Utilizing this ion-exchange property, a silicate is taken in and fixed in a multilayer bilayer membrane by an ion-exchange reaction to produce a multilayer porous silica thin film (Japanese Patent Application No. 2-310734). reference). In addition, when an organic dye such as ionic porphyrin is introduced into the multilayer bilayer thin film of an amphipathic substance, a magnetic anisotropic thin film with high anisotropy in a form reflecting the molecular organization of the multilayer bilayer thin film. And optical functional thin films are manufactured (Japanese Patent Application No. 4-87982,
See Japanese Patent Application No. 4-101822). In the present invention, similarly utilizing the ion exchange reactivity of amphiphiles,
Other ionic species are introduced into the silica composite while maintaining the molecular organization of the amphipathic substance. The amphipathic substance used in the present invention is disclosed in Japanese Patent Application No. 1-1314 because of the necessity in the supporting process.
Of the amphipathic substances introduced in Japanese Patent Application No. 78 and Japanese Patent Application No. 2-414138, it is desired that the polar group be ion pair type or ion dissociative. The hydrophobic group is not particularly limited.

An amphipathic substance whose polar group is an ion pair type or an ion dissociative type also has an ion exchange property even in a molecular assembly. The ion exchange performance differs depending on the chargeability and molecular structure of the substance to be ion-exchanged, in addition to the molecular organization of the amphipathic substance. However, an amphipathic substance having a high ability to form a bilayer membrane is generally more effective than a surfactant forming a micelle. This is because the bilayer membrane structure is stable in terms of tissue structure similar to that of a biological membrane and is excellent in the property of incorporating other substances, that is, the host-guest property. The structural characteristics of the bilayer membrane structure also appear when manufacturing porous silica, etc., and form micelles due to the variety of pore morphology, controllability of pore distribution, size of specific surface area, etc. It is superior to other surfactants. Therefore, an amphipathic substance having a bilayer film-forming ability is particularly effective for the production of a silica-supported material, in addition to the action of the molecular organization of the amphipathic substance in the production of a porous silica material.

Similarly, it is desired that the supported material and the supported material precursor be an ion pair type or ion dissociative compound. The supported substance or the supported substance precursor is selected in consideration of the ion exchange reactivity with the amphipathic substance. For example, in order to form an ion pair with an ionic residue of an amphipathic substance, the supported substance or the supported substance precursor needs to have a charge opposite to that of the ionic residue of the amphiphilic substance. However, when there is no room for selection of the ionic charge due to the restrictions on the supported material or the supported material precursor, the amphiphilic substance is appropriately selected in consideration of the pore characteristics of the silica porous material, and the silica porous material is selected. Need to be prepared. When contacting a supported material or a supported material precursor to a silica composite containing an amphipathic substance,
Considering the solubility of amphiphiles in organic solvents,
Water-soluble supported substances and supported substance precursors are preferable. Ion pair type or ion dissociative supported materials and supported material precursors are
When used as an aqueous system, the contact treatment can be easily performed.

As the contact treatment method, a method of dropping a supported material or a solution containing a supported material precursor on the silica composite is also possible, but the supported material or the supported material is considered in consideration of operability. The method of immersing the silica composite in the solution containing the precursor is convenient. The ion exchange reaction between the amphipathic substance and the supported substance or the supported substance precursor easily proceeds at the molecular level even at room temperature. The operating conditions of the contact treatment are not particularly limited in terms of the solution concentration of the supported material or the precursor of the supported material, the processing temperature, and the like. The amount of the supported material supported on the porous silica material is determined by the amount introduced by the contact treatment operation between the silica composite and the solution of the supported material or the precursor of the supported material. for that reason,
For example, in the dipping method, the conditions such as the concentration and temperature of the supported substance or the supported substance precursor in the contacted solution, the contact time and the like are appropriately selected. Further, the introduction amount can be adjusted by repeating the contact treatment between the silica composite and the supported material or the supported material precursor a plurality of times.

When the precursor of the material to be supported is supported, a chemical treatment or a thermal treatment for converting it into a desired substance form is carried out to obtain the material to be supported. The chemical treatment or thermal treatment is appropriately selected according to the supported material precursor. Liquid-phase solid-liquid contact treatment in which the precursor-supported material is immersed in the treatment liquid is also effective, but when considering the ion exchange reactivity of the precursor-supported material, vapor-liquid treatment using a vapor or gaseous treatment agent is considered. Contact systems are preferred. It is effective that the chemical treatment or the thermal treatment is performed in the coexistence of an amphipathic substance in a form that reflects the supported state of the supported material precursor. Incidentally, if the amphipathic substance is removed before treating the precursor, the precursor may fall off from the silica composite or the dispersion state of the obtained carrier may become poor.

The chemical treatment or thermal treatment for residual SiOR, SiOH or the like to form a siloxane network bond is carried out after the supported material or the precursor of the supported material is supported on the silica composite to obtain siloxane or The supported substance or the supported substance precursor is incorporated into the carrier network of silica. As a result, a high immobilization effect is exhibited. As the chemical treatment or the thermal treatment, when considering the ion-exchange property of the amphipathic substance, a method of contacting with vapor such as ammonia or hydrochloric acid is preferable.

At this time, in the contact treatment of the silica composite with the solution of the supported material or the supported material precursor, the reaction rate of ion exchange may be suppressed by the siloxane network bond. Therefore, the chemical treatment or the thermal treatment can be applied to the silica porous material before the contact treatment with the supported material or the solution containing the supported material precursor, but it is more effective to perform it after the contact treatment. . The silica-supported material produced in this way is required to be subjected to an extraction treatment using an extractant selected according to the type of the amphipathic substance, an incineration treatment heated to 300 ° C. or higher in an oxidizing atmosphere, and the like. The amphiphile is correspondingly removed. The extraction process, the incineration process, etc. are not necessarily required steps, and are appropriately selected depending on the application and use conditions of the silica-supported material.

[0018]

EXAMPLES The present invention will be specifically described below with reference to examples. In this example, a silica carrier was prepared from an alkoxysilane, and a silica composite containing an amphipathic substance to be brought into contact with an object to be supported was prepared according to the following procedure. Compounds 1 to 5 shown in FIG. 1 were used as amphipathic substances.
Compounds 1 to 3 have a cationic group whose polar group is an ammonium salt type. The compounds 4 and 5 are phosphoric acid groups and have an anion residue. Of these, compounds 1 and 4 are ordinary surfactants, and compounds 2, 3 and 5 are amphipathic substances capable of forming a bilayer film. CH ₃ as various silane amphipathic substances equivalent to 50 mM and alkoxysilane substances
_{Si- (OCH 3) 3 2.04g (} 50 -fold molar equivalent amount of amphiphile) was dispersed and dissolved in pure water ultrasonic irradiation while 6 ml, to prepare a mixed dispersion of a plurality of types. Each of the mixed dispersions was placed in a glass container with an open stopper, and allowed to stand in a constant temperature and humidity chamber at a temperature of 25 ° C. and a relative humidity of 60% for 3 days. As a result, a white solidified product, that is, a silica composite containing an amphipathic substance was obtained by evaporation of water.

-Example 1- An example of the production of a platinum-silica-supported material used in various reactions as a heterogeneous catalyst is shown. In order to disperse and support platinum metal on the silica composite, the silica composite was first brought into contact with the aqueous solution of the precursor compound by immersion. As the platinum metal precursor compound, a compound 1 in which the polar group is a cation residue
~ 3 as an amphiphile, silica (IV) potassium chloroplatinate (IV), and silica composites prepared from compounds 4 and 5 having an anion residue, tris (ethylenediamine) platinum (IV) hydrochloride. It was used. A platinum metal precursor compound was prepared in a 20 mM aqueous solution.
The silica composite was immersed in 100 ml of an aqueous solution and left at room temperature of about 25 ° C. for one day. Then, the silica complex colored in orange or yellow was collected by filtration, washed with water and dried. A silica composite containing potassium chloroplatinate or tris (ethylenediamine) platinum hydrochloride was filled in a glass tube and inserted into a tubular electric furnace. And it hold | maintained at 150 degreeC under hydrogen stream for 3 hours, and potassium chloroplatinate or tris (ethylenediamine) platinum hydrochloride reduced the platinum metal.

The thus obtained gray platinum-silica supported material was enclosed in a sealed glass container filled with aqueous ammonia and left at room temperature of about 25 ° C. for one week. As a result, the remaining Si
The reaction to siloxane bonds such as OR and SiOH was promoted. The platinum-silica-supported material that had been allowed to stand for one week was taken out of the glass container, filled again in the glass tube, and inserted into the tubular electric furnace. Then, the mixture was kept at 300 ° C. for 5 hours under an air stream to incinerate and remove the amphipathic substance and the like. The amount of platinum supported on the finally obtained platinum-silica supported material was measured by fluorescent X-ray analysis. Further, the platinum specific surface area was calculated from the amount of hydrogen adsorbed on the supported material at room temperature (about 25 ° C.), and the average particle diameter of the supported platinum was determined assuming that the supported platinum was spherical particles. The measurement result
It shows in Table 1.

[Table 1]

Experiment No. 6 in Table 1 is an experiment conducted to examine the influence of the growth of siloxane bonds and crosslinks on the ion exchange reactivity of the silica composite. Experiment number 6
In the above, prior to the dipping of potassium chloroplatinate in the aqueous solution, the silica composite was sealed in a sealed glass container filled with aqueous ammonia and left at room temperature of about 25 ° C. for one week. Then, similarly to Experiment Nos. 1 to 5, the material was immersed in an aqueous solution of potassium chloroplatinate and subjected to a reduction treatment to produce a platinum silica-supported material. Experiment No. 7 is a comparative example in which a platinum-silica supported material was prepared without adding an amphipathic substance. In this case, CH ₃ Si (OCH ₃ ) _{3 is} used as the alkoxysilane substance.
04 g and 20 mM aqueous solution of potassium chloroplatinate 2.5
5 ml (corresponding to 1% by weight of platinum carried) of pure water 3.4
To 4 ml, the solution was dispersed and dissolved while being irradiated with ultrasonic waves to prepare a uniform mixed dispersion. Platinum silica-supported materials were prepared in the same manner as in Experiment Nos. 1 to 5 except that the treatment operation of immersing in the platinum precursor compound solution was omitted.

As is clear from Table 1, the platinum-silica-supported materials of Experiment Nos. 1 to 6 prepared using the amphiphile were compared with Experiment No. 7 prepared without using the amphiphile. In each case, it can be seen that the supported platinum particle size is small and highly dispersed. In addition, in Experiment Nos. 2, 3 and 5 in which amphipathic substances capable of forming a bilayer film were used, the amount of supported platinum was higher than that in Experiments 1 and 4 in which a surfactant was used, and It has been shown that the amphipathic substance capable of forming a film has a high ion exchange property. Comparing the platinum-silica supported materials obtained in Experiment No. 2 and Experiment No. 6, there is no difference in the platinum particle size, but the amount of platinum supported in Experiment No. 2 is small. From this, it can be seen that when the siloxane crosslinkage is high, the reaction rate of ion exchange is suppressed.

Example 2-A silica-supported material of a porphyrin compound, which is a highly functional optical material, was manufactured as an example of the preparation of an immobilized support material of an organic dye compound. As the porphyrin compound, the anionic compound 6 whose structure is shown in FIG. 2 was used. Corresponding to compound 6, a silica composite prepared from the amphiphiles of compounds 1 to 3 with cation residues was used. Compound 6
The silica complex is immersed in a 0.2 mM aqueous solution of
When the supporting treatment was carried out by leaving it at room temperature for 24 hours, the silica composite was colored uniformly reddish purple. The silica composite was taken out, thoroughly washed with pure water, and then air dried.

Then, the silica composite supporting the porphyrin compound was enclosed in a closed glass container filled with aqueous ammonia and left at room temperature of about 25 ° C. for one week. Then, it was taken out from the glass container and vacuum deaerated. 100 mg of the obtained porphyrin-supported material was used in a tablet press to obtain a diameter of 1
It was molded into a disk shape of 0 mm, and its fluorescence spectrum was measured at an excitation wavelength of 425 nm. The fluorescence intensity was relatively evaluated with 1 being the strongest of the measured samples. The excess results are shown in Table 2. Further, in order to examine the immobilization stability of the supported material, 0.5 g of the prepared porphyrin-supported material was put into 100 ml of pure water and left standing overnight, and then the coloring state of water was visually observed. When no coloring was detected, it was determined that the immobilization stability was good, and in Table 2, it was represented by ◯. On the other hand,
When the coloring was detected, the immobilization stability was determined to be poor.

[Table 2]

Experiment numbers 11 and 12 in Table 2 are experiments for comparison. In Experiment No. 11, the porphyrin compound was directly added to the mixed dispersion liquid of the amphipathic substance and the alkoxysilane substance to obtain a solidified product under the same conditions as in Experiment Nos. 8 to 10. In Experiment No. 12, a mixed dispersion liquid of an alkoxysilane substance and a porphyrin compound was similarly prepared in a system containing no amphipathic substance to obtain a solidified product. Experiment number 1
Both 1 and 12 are 1/100 (mol-porphyrin compound / mol of the porphyrin loading amount in the experiment number 9.
-Amphiphile) was added and subjected to ammonia vapor treatment to accelerate the siloxane crosslinking reaction.

It is assumed that the fluorescence intensity reflects the dispersion state of porphyrin in the silica carrier. That is, as seen in Experiment No. 11 in which a porphyrin compound was directly introduced without utilizing an ion exchange reaction and Experiment No. 12 in which a silica complex was prepared without adding an amphipathic substance, fluorescence was caused by association of the porphyrin compound. The strength has dropped sharply. On the other hand, in the system in which the porphyrin compound was introduced by utilizing the ion exchange reaction using the amphipathic substance, that is, in Experiment Nos. 8 to 10, a considerably large fluorescence intensity was obtained as compared with Experiments 11 and 12. It is speculated that the porphyrin compound is highly dispersed at the molecular level in the silica carrier.

Experiment No. 8 is an example of preparing a silica composite using a surfactant, and compared with Experiment Nos. 9 and 10 in which an amphipathic substance capable of forming a bilayer film was used, fluorescence was increased. The strength is low. This is due to the difference in ion exchange reactivity due to amphiphiles, and amphiphiles with the ability to form bilayer membranes have a higher ion exchange capacity than ordinary surfactants. It is excellent and enables a large amount of porphyrin to be introduced. Further, in any of the experimental examples using the amphiphile, compared to the case where the amphiphile is not used, there is no elution of the porphyrin as the supported material, and the immobilization effect of the supported porphyrin is excellent. It is understood that there is.

[0028]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, by effectively utilizing the ion exchange property of the amphipathic substance or the molecular assembly of the amphipathic substance, the supported material is a porous silica material. It is highly dispersed in the inside and fixed stably. The function and performance of the supported material can be enhanced by spreading the supported material in the form of fine particles or in a molecular unit on the silica carrier for high dispersion. For example, in the case of a supported catalyst, by spreading the catalytically active component in the form of fine particles, the surface exposure amount of the catalytic component, that is, the surface area is increased, and the reaction activity per unit weight is achieved. In the case of dyes such as porphyrin,
The association state is greatly related to the functionality, and the fluorescent property is dramatically increased by the molecular dispersion, and it is expected to be applied to various optical functional materials and electronic materials. In addition, with semiconductors and metals such as cadmium sulfide, non-linear optical materials can be obtained by the quantum size effect.

In general, a support material highly dispersed on a carrier has a high property of reaggregation or reassociation by surface tension in the case of fine particles and by stabilization energy due to association in the case of porphyrin and the like. The dispersity of the supported material may decrease with time, leading to deterioration or deterioration in performance.
Therefore, the carrier is required not only to disperse the supported material but also to stabilize the highly dispersed material. Also in this respect, the silica-supported material according to the present invention has a high effect of fixing and stabilizing the supported material due to the effect of the amphipathic substance,
It is also effective against these problems. Furthermore, by using the molecular template effect of the amphipathic substance together, not only the dispersed state of the supported material but also the high-performance silica-supported material in which the pore structure of the carrier silica is controlled can be produced. This is particularly effective in applications in which fluid contact such as catalysts and sensors is performed. The obtained silica-supported material has a wide range of fields as a supported catalyst utilizing its porous structure, a fine particle dispersion for optical materials, and a molecular dispersion / immobilized body of various functional organic compounds such as dyes and enzymes. Used in.

[Brief description of drawings]

FIG. 1 is a structural formula of an amphipathic substance used in Examples of the present invention.

2 is a porphyrin compound supported on a porous silica material in Example 2. FIG.

Claims (3)

(57) [Claims] 1. A silica composite is prepared by evaporating and removing a solvent from a mixed dispersion liquid containing an amphipathic substance having a polar group and a hydrophobic group respectively added to both ends of a molecule and a silica-forming substance, the silica complex is contacted with a solution containing ions of the carried object or the supported precursor, the amphiphilic
A method for producing a silica-supported material , comprising supporting the supported material or a supported material precursor on the silica composite in the presence of a functional substance . 2. A chemical treatment or a thermal treatment in the coexistence of an amphipathic substance after the silica composite according to claim 1 is contacted with a solution containing an ionic supported substance or a supported substance precursor. so
A method for producing a silica-supported material, which comprises subjecting SiOR and SiOH to a polycondensation reaction . 3. A method for producing a silica-supported material, wherein the amphipathic substance according to claim 1 is capable of forming a bilayer film.