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Inorganic mesoporous materials with chiral nematic structures and preparation method thereof

An inorganic material, chiral technology, applied in inorganic chemistry, liquid crystal materials, chemical instruments and methods, etc., can solve the problem of no obvious evidence of long-range chiral order, etc.

Inactive Publication Date: 2013-03-20
FPINNOVATIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the presence of chiral nematic organization in the composite, there is no clear evidence of long-range chiral order in the pure silica replica

Method used

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  • Inorganic mesoporous materials with chiral nematic structures and preparation method thereof
  • Inorganic mesoporous materials with chiral nematic structures and preparation method thereof
  • Inorganic mesoporous materials with chiral nematic structures and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0065] Synthesis of Silica / NCC Composite:

[0066] Add 0.600 mL of tetraethoxysilane (TEOS) to 10 mL of freshly sonicated 3% suspension of NCC in water. The mixture was stirred at 60 °C until a homogeneous mixture was obtained (~3 h), indicating complete hydrolysis of TEOS. Allow to cool to room temperature and drop-cast onto polypropylene Petri dishes. After slow evaporation at room temperature, a blue iridescent free-standing film (490 mg) was obtained. TGA curves and IR data are shown in Figure 17 and Figure 18 middle.

[0067] Calcination:

[0068] 300 mg of composite film was heated to 540°C at a rate of 120°C / h and maintained at 540°C for 6 hours under flowing air. After slow cooling to room temperature, 100 mg of a free-standing colorless film could be recovered. The IR spectrogram of the sample confirmed that the NCC was completely removed ( Figure 19). Nitrogen adsorption measurements show 720m 2 / g BET surface area ( Figure 13 ), and SEM images reveale...

preparation example 2

[0070] Synthesis of Silica / NCC Composite:

[0071] 1.950 mL of TEOS was added to 10 mL of freshly sonicated 3% NCC suspension in water, and the mixture was stirred at 60 °C until a homogeneous mixture was obtained (~3 h), indicating complete hydrolysis of TEOS. Allow to cool to room temperature and drop-cast onto polypropylene Petri dishes. After slow evaporation at room temperature, a free-standing red iridescent film was obtained.

[0072] Calcination:

[0073] 300 mg of composite film was heated to 540°C at a rate of 120°C / h and maintained at 540°C for 6 hours under flowing air. After slow cooling to room temperature, 180 mg of a free-standing blue-green film were recovered. IR confirmed complete removal of NCC, and nitrogen adsorption measurements showed 408m 2 / g of BET surface area.

preparation example 3

[0075] Synthesis of Silica / NCC Composite:

[0076] Add 0.750 mL of TEOS to 6 mL of freshly sonicated 2% NCC suspension in water. The mixture was stirred at 60 °C until a homogeneous mixture was obtained (~3 h), indicating complete hydrolysis of TEOS. Allow to cool to room temperature and drop cast onto polypropylene Petri dishes. After slow evaporation at room temperature, a colorless film was obtained.

[0077] Calcination:

[0078] 300 mg of composite film was heated to 540°C at a rate of 120°C / h and maintained at 540°C for 6 hours under flowing air. After slow cooling to room temperature, 195 mg of a free-standing red film were recovered. The IR spectrum of the sample confirmed complete removal of NCC.

[0079] Nitrogen adsorption measurements show 240m 2 / g BET surface area, and SEM images show a structure consistent with the chiral nematic organization ( Figure 9 ).

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Abstract

The present invention describes a composition and a method for producing mesoporous silica materials with a chiral organization. In the method, a polymerizable inorganic monomer is reacted in the presence of nanocrystalline cellulose (NCC) to give a material of inorganic solid with cellulose nanocrystallites embedded in a chiral nematic organization. The NCC can be removed to give a stable porous structure that retains the chiral organization of the NCC template. The new materials may be obtained as iridescent free-standing films with high surface area. Through control of the reaction conditions, the colour of the films can be varied across the entire visible spectrum. These are the first materials to combine mesoporosity with long-range chiral ordering that leads to photonic properties. Examples of possible applications of the materials are: lightweight reinforcement materials, low k dielectric materials, tunable reflective filters, adsorbents, stationary phases for chromatography of chiral or achiral substances, supports for catalysts (e.g., for asymmetric synthetic transformations), and as a template to generate other new porous materials (e.g., porous carbon or porous metals), preferably with chiral nematic structures.

Description

technical field [0001] The present invention relates to a novel mesoporous material, preferably a chiral inorganic mesoporous material (such as silicon dioxide) having both a mesoporous structure and a chiral nematic sequence generated from a template (especially a cellulose template). Background technique [0002] Templated synthesis of self-assembled inorganic solids via lyotropic liquid crystals enables access to materials with well-defined porous structures [1-10] . In 1992, Beck et al. [2,9,10] The liquid crystal templating method described for the first time has become an important route to prepare organized, periodic materials with organization in the range of 2-50 nm. Typically, mesoporous solids are formed by hydrolysis or condensation of silica precursors such as tetraethoxysilane in the presence of liquid crystal templates. Although ionic surfactants were used in the original invention, a variety of molecules (eg, nonionic surfactants) and polymeric substances ...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01B33/16C08J9/28C08K3/36C08L1/02
CPCB01D71/027C01B37/00C01G19/02B01D67/0048C01G17/02C09K19/52B01D67/0058B01D2325/025C09K19/02B01D2325/44C01B33/12B01D2325/43
Inventor M·J·麦克拉克兰K·E·绍普索维茨W·Y·哈玛德H·齐
Owner FPINNOVATIONS INC
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