Aqueous microdroplets are of significant interest in biological fields, while the employment of water-inoil (w/o) emulsion and lack of spatial control precluded its widespread application. Herein a novel microfluidic ...Aqueous microdroplets are of significant interest in biological fields, while the employment of water-inoil (w/o) emulsion and lack of spatial control precluded its widespread application. Herein a novel microfluidic approach is developed to generate water-in-water (w/w) microdroplets embedded in hydrogel microfibers. Aqueous two phase system (ATPS) is applied to generate w/w droplets, and alginate is introduced to continuous phase to form microfibers, which offers spatial restriction and manipulation possibility to droplets. The size and pattern of aqueous droplets can be precisely controlled, and immobilization within hydrogel fiber facilitates easy manipulation and observation. The microdroplets surrounded by hydrophilic environment can act as a cell-cell interaction model, and their potential for biological and environmental applications are demonstrated by long-term culture of encapsulated cells and water remediation of Bacillus subtilis.展开更多
基金supported by the National Natural Science Foundation of China(62075043)Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZZ126)。
文摘对于采用旋涂法制备量子点层的传统量子点发光二极管(QLEDs)而言,由于量子点有序性低,量子点薄膜不可避免地出现空隙,导致器件在偏压下产生漏电流.本研究中,我们利用Langmuir-Blodgett(LB)技术制备了超均匀、高度有序的量子点单层,并且采用水平提拉法(HL)将量子点单层作为发光层转移到红色QLEDs上,器件表现出了高性能,其外量子效率(EQE)为19.0%,寿命(T_(95)@100 cd m^(-2))为13,324 h.由于致密有序的量子点单层减少了漏电流,EQE和寿命分别提高了15%和183%.此外,LB技术是一种无有机溶剂气氛的方法,避免了层间互溶,同时也可以精确控制量子点薄膜的厚度,因此所制备的叠层白光QLEDs可以在4 V的低电压下获得白光.最后,我们成功地在9 cm×5 cm的矩形基板上制备了超均匀大面积量子点单层,表明LB-HL方法具有良好的尺寸可扩展性.
基金financially supported by the National Natural Science Foundation of China (Nos. 81872835, 21621003)Ministry of Science and Technology (Nos. 2017YFC0906902 and 2017ZX09301032)Macao Science and Technology Development Fund (No. 129/2017/A3)
文摘Aqueous microdroplets are of significant interest in biological fields, while the employment of water-inoil (w/o) emulsion and lack of spatial control precluded its widespread application. Herein a novel microfluidic approach is developed to generate water-in-water (w/w) microdroplets embedded in hydrogel microfibers. Aqueous two phase system (ATPS) is applied to generate w/w droplets, and alginate is introduced to continuous phase to form microfibers, which offers spatial restriction and manipulation possibility to droplets. The size and pattern of aqueous droplets can be precisely controlled, and immobilization within hydrogel fiber facilitates easy manipulation and observation. The microdroplets surrounded by hydrophilic environment can act as a cell-cell interaction model, and their potential for biological and environmental applications are demonstrated by long-term culture of encapsulated cells and water remediation of Bacillus subtilis.
