CAJ | 학술논문

采用原子力显微镜(AFM)研究了TiO_2颗粒在不同介质条件下的聚集行为.结果表明,TiO_2的聚集存在两重行为即大颗粒间的弱聚集和晶粒间的强聚集.超声条件下,水中可以打开大颗粒间的弱聚集而不能打开强聚集,但是在同样条件下通过选择含有单供电子的分子如丁酮或三乙胺为介质,可以打开强聚集得到单个晶粒.结合介质的分子结构,提出了TiO_2的聚集源于表面不饱和配位原子的氢键及配位的作用机理.对理解底端向上策略组装纳米晶粒和避免纳米颗粒在应用中存在的聚集问题有重要意义.
채용원자력현미경(AFM)연구료TiO_2과립재불동개질조건하적취집행위.결과표명,TiO_2적취집존재량중행위즉대과립간적약취집화정립간적강취집.초성조건하,수중가이타개대과립간적약취집이불능타개강취집,단시재동양조건하통과선택함유단공전자적분자여정동혹삼을알위개질,가이타개강취집득도단개정립.결합개질적분자결구,제출료TiO_2적취집원우표면불포화배위원자적경건급배위적작용궤리.대리해저단향상책략조장납미정립화피면납미과립재응용중존재적취집문제유중요의의.
The aggregation behavior of titanium dioxide(TiO_2)particles in different medium is investigated with atomic force microscopy(AFM).The results demonstrate that two aggregation manners of TiO_2,week interaction of large paticles and strong interaction of nanocrystal are observed.Under ultrasonic treament combined with different solvent,the weak interaction between larger units can be unfolded except the strong interaction of nanocrystals.On the same condition,the single TiO_2 nanocrystal is achieved in the solvent such as butanone and triethylamine with single donor atom.A skech map for the interaction of TiO_2 suggests that the aggregation results from the presence of unsatureated atoms on the surface of TiO_2 nanoparticles,which can act with other molecule or surface through hydrogen and coordination bond.These findings will help us in understanding the organization of nanocrystal in bottom-up strategy and controlling the aggregation of nanoparticles in application.