研究目的
To prepare chiral silica by imprinting supramolecular chirality from natural triterpenoid-regulated helical ribbons.
研究成果
The study successfully demonstrated a simple and useful strategy to prepare chiral silica by imprinting the supramolecular chirality from natural triterpenoid-regulated helical ribbons. This approach could promote the application of chiral natural products in material science.
研究不足
The study does not clarify the factor that affected the tilt direction and symmetry breaking in the assembly process. Additionally, the application of the prepared chiral silica in practical scenarios is not explored.
1:Experimental Design and Method Selection:
The study involved the design and synthesis of an amphiphilic molecule C4-MOP, which was then used to fabricate helical nanoribbons in methanol/water. The supramolecular chirality of these ribbons was imprinted onto silica nanostructures via a gel–sol mineralization process.
2:Sample Selection and Data Sources:
Oleanolic acid (OA) was selected as the central building block for constructing supramolecular chiral structures. The assembly of C4-MOP was investigated in methanol/water to appoint the organic chiral template.
3:List of Experimental Equipment and Materials:
TEM, SEM, AFM, HRTEM, EDS, UV-vis, CD, XRD, FTIR, TGA, BET surface-area measurement.
4:Experimental Procedures and Operational Workflow:
The assembly of C4-MOP was regulated into helical ribbons by adjusting solvent compositions and concentration. The chiral silica materials were then generated via a sol–gel silica mineralization process.
5:Data Analysis Methods:
The chirality of the assemblies was analyzed using CD spectra. The arrangement of C4-MOP within the helical ribbons was investigated using UV-vis, theoretical computational, and XRD measurements.
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Transmission electron microscopy
H-7650B
Hitachi Ltd
To obtain TEM images of C4-MOP assemblies
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High resolution transmission electron microscopy
JEM 2100F
JEOL Ltd
To obtain HRTEM images and EDS chemical element analysis
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Atomic force microscope
SPM-9600
Shimadzu Co.
To acquire AFM images in the tapping mode
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X-ray diffraction
Rigaku D/max 2500v
Rigaku Co.
To record XRD measurements
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FTIR spectra
Perkin Elmer spectrum 100
Perkin Elmer
To record FTIR spectra
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UV-vis spectra
TU-1901
Beijing Persee General Instrument Co. Ltd
To record UV-vis spectra
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Circular dichroism spectra
Pistar p-180
Applied Photophysics Ltd
To record CD spectra
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Thermogravimetric analysis
TA Instruments Q50
TA Instruments
To perform TGA measurements
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Nitrogen adsorption/desorption isotherms
Micromeritics ASAP2020
Micromeritics Instrument Co.
To record nitrogen adsorption/desorption isotherms
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