CAJ | 학술논문

研究了两性离子配体修饰的金纳米颗粒在酸性和碱性溶液中的稳定性和可逆聚集性.测量了金溶胶在不同条件下的UV-Vis吸收光谱,通过光谱的变化揭示其稳定性和可逆聚集性.结果表明:经配体修饰的金纳米颗粒在酸性和碱性溶液中的稳定性有了很大的提高;强酸性条件可诱导金溶胶失稳聚沉,回调pH值又可使其重新分散.利用这种pH依赖的可逆聚集特性,可以将稀溶胶浓缩成浓溶胶或固体保存,一旦需要又可加水恢复到分散的状态.
연구료량성리자배체수식적금납미과립재산성화감성용액중적은정성화가역취집성.측량료금용효재불동조건하적UV-Vis흡수광보,통과광보적변화게시기은정성화가역취집성.결과표명:경배체수식적금납미과립재산성화감성용액중적은정성유료흔대적제고;강산성조건가유도금용효실은취침,회조pH치우가사기중신분산.이용저충pH의뢰적가역취집특성,가이장희용효농축성농용효혹고체보존,일단수요우가가수회복도분산적상태.
In this work, the stability and reversible aggregation properties of zwitterion-modified Au nanoparticles (Au NPs) were studied under acidic and alkaline conditions. The UV-Vis spectra of the Au col oids were measured under different conditions, and the stability and reversible aggregation properties of the Au col oids were revealed through the spectral changes. The results showed that the modification with zwitterionic ligands largely improved the stability of the Au NPs under both acidic and alkaline conditions. Under strongly acidic conditions, the modified Au NP col oids lost stability and aggregated, but the aggregated col oids could be redispersed once the pH of the col oids was returned to an appropriate value. By exploiting their pH-dependent reversible aggregation properties, dilute Au NP col oids were concentrated to give concentrated Au NP col oids or solid Au NP aggregates; these systems could be preserved for long periods of time, and if needed, could be recovered to give wel -dispersed dilute dispersions simply by adding water.