Transformation Of Fullerene Crystal Morphology

In today’s world,the concept of nanoarchitecture is quietly emerging,and the use of nanotechnology for material synthesis will be an effective method to produce materials with ideal functions.Based on the integration of nanotechnology and organic chemistry,supramolecular chemistry,materials science,bio-related technology and other research fields,functional materials with necessary properties are constructed with nano-scale units.As a zero-dimensional unit composed of a single carbon element,the fullerene molecule has excellent physical and chemical properties and photoelectric properties,and can be regarded as the simplest assembly component.The self-assembly of fullerene C₆₀molecules into fullerene crystals with different dimensional morphologies has realized the continuous development of the excellent properties of fullerenes,and the effective control of the fullerene crystal morphology has achieved the realization of fullerene crystals with different morphologies.Mutual transformation,making fullerene molecules arbitrarily built like building blocks is tantamount to another challenge in nanoarchitecture,which has become a main topic explored by scholars.The following points are the main contents of this dissertation research:Using the poor solvent immersion method,by changing the solvent environment of the fullerene C₆₀crystals,the fullerene crystals are induced to dissolve and recrystallize into fullerene crystals with different morphologies,realizing the transformation from one-dimensional rod-shaped fullerene crystals to two-dimensional sheets.The morphology of the two-dimensional flaky crystals is transformed into one-dimensional rod-like crystals.It is also speculated that the possible mechanism of the cyclic transformation of the morphology induced by poor solvent immersion is that the poor solvent ethanol and the good solvent toluene form a liquid-liquid interface that induces fullerene crystals to dissolve and recrystallize to precipitate crystals.The controllable preparation of fullerene tubular crystals loaded with organic nitrogen was studied.The fullerene rod-shaped crystals prepared by LLIP method were etched by ethylenediamine,and the result was achieved.The morphology of fullerene solid rod-shaped crystals is transformed into hollow tubular crystals,and the degree of hollowness of the tubular crystals can be controlled by adjusting the concentration of ethylenediamine and the ultrasonic time.The prepared fullerene tubular crystals can achieve the effect of organic nitrogen.This is expected to be applied to the adsorption of organic nitrogen in wastewater.Using the LLIP method,by setting different concentrations of fullerene C₆₀in the fullerene C₆₀o-xylene/n-butanol system,the effect of fullerene C₆₀concentration on the morphology of fullerene crystals was studied,and it was found that the crystal morphology of low fullerene C₆₀concentration was one-dimensional rod-shaped.The morphology of the crystal prepared with high fullerene C₆₀concentration is three-dimensional block,and the morphology of the three-dimensional block to one-dimensional rod crystal can be changed by evaporating the block crystal,and the possible transformation mechanism is speculated.