CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zongbo Zhang,Kai Wang,Changbin Xu,Yu Zhang,Wenting Wu,Changhe Lu,Wengang Liu,Yunlong Rao,Chen Jiang,Chunling Xu,Shiliang Song
Droplet microreactors are powerful tools for synthesizing chemicals, nano materials and biomolecules, but traditional methods, such as mechanical stirring, are hard to enhance the internal mass transfer of droplet microreactor due to its small reaction space. In this study, we propose a novel ultrasonic-enhancing method for droplet microreactor, and report the effect of bubbles inside micro-droplets for the first time. On this basis, the synthesis of AgInS 2 nanocrystals is selected as model reaction to study the enhancement mechanism. It is discovered that the flow field in micro-droplet is significantly improved owing to acoustic streaming and cavitation microstreaming. Benefiting from them, the mass transfer coefficient is enhanced by 72.5 %, and AgInS 2 nanocrystals are successfully synthesized with smaller, more uniform particle size, as well as more adjustable performance compared with no ultrasonic radiation condition. This work provides a new method and a deep insight of ultrasound enhancing droplet microreactor, enabling the continuous production of fine chemical synthesis.
研究领域:
化学工程
·
纳米材料科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Zhi Zeng,Aiqi Wang,Lulu Ping,Jinglian Yang,Qianming Wang
Novel nanoparticles of AgInS 2 doped with trivalent lanthanide ions were synthesized by a one-pot reaction at low temperature. Well-defined microstructures were achieved and very uniform nanocrystals with regular shapes were found in lanthanide incorporated AgInS 2 . These nanoparticles exhibited red emissions under ultraviolet excitation. The resultant luminescence intensities could be tuned by controlling the diffusion of different lanthanides. This design strategy and remarkable features of morphology or photoluminescence will expand their application in optical fields.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 33
·6443-6447
·
IF 3.879
Manjiao Deng,Shuling Shen,Xuewen Wang,Yejun Zhang,Huarui Xu,Ting Zhang,Qiangbin Wang
High quality AgInS2 nanocrystals (NCs) are synthesized using a simple single-source precursor method, in which the size and morphology of the products can be precisely controlled from heliotrope seed-like NCs of 6 × 12 nm to heliotrope seed-like dimer NCs of 8 × 16 nm by tuning the composition of the coordinating solvents of oleic acid and 1-dodecanethiol. The results show that 1-dodecanethiol plays a dominant role in determining the morphology of AgInS2 NCs due to its strong absorption onto the {001} crystal plane of AgInS2 NCs. The photoelectric properties of the as-prepared AgInS2 NCs have been characterized using AgInS2-poly(3-hexylthiophene) hybrid nanodevices. The results illustrate that the AgInS2 NCs present very high photosensitivity and photostability to outside illumination. The high sensitivity and stability of the hybrid nanodevice indicate a broad spectrum of applications in the photoelectric nanodevices.
研究领域:
材料科学
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纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 51
·13676-13680
·
IF 5.16
Huishan Shang,Qiumei Di,Muwei Ji,Bing Bai,Jiajia Liu,Wenxing Chen,Meng Xu,Hongpan Rong,Jia Liu,Jiatao Zhang
Graphical Tunable nanocrystals . Ternary I-III-VI 2 (AgInS 2 ) colloidal nanocrystals (NCs) with precise control of the composition (from In 3+ doping to ternary composition) and good NIR fluorescence performance (800–1000 nm) have been synthesized by facile low-temperature in situ conversion of colloidal Ag 2 S nanoparticles. In 3+ ions were inserted into the crystal lattice of Ag 2 S NCs at a relatively low temperature as dopant with ternary AgInS 2 NCs obtained at a higher temperature following a phase transition (see figure). Focusing on ternary I-III-VI 2 colloidal nanocrystals (NCs) synthesized with precise control of the composition (from doping to ternary composition) and NIR fluorescence performance, monodisperse binary In 3+ -doped Ag 2 S NCs and ternary AgInS 2 NCs have been achieved successfully by facile low-temperature in situ conversion of colloidal Ag 2 S nanoparticles. In 3+ ions were inserted into the crystal lattice of Ag 2 S NCs at a relatively low temperature as dopant and ternary AgInS 2 NCs were obtained at a higher temperature following a phase transition. These doped Ag 2 S and AgInS 2 NCs based on different indium precursor concentrations were explored with respect to the position and intensity of the near-infrared photoluminescent emission at different doping levels and crystal phase evolution.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 5
·1307-1315
·
IF 6.641
Bin Zeng,Fei Chen,Zhenyang Liu,Zhongyuan Guan,Xu Li,Feng Teng,Aiwei Tang
Herein, we demonstrated a seed-mediated growth method for the synthesis of ternary AgInS2 (AIS) and quaternary Ag–In–Zn–S (AIZS) nanocrystals (NCs) by means of a partial cation exchange with In3+ and Zn2+ ions. Binary Ag2S NCs with different sizes were synthesized first, which then acted as the seeds to prepare different-sized AIS NCs through the incorporation of In3+. The formation mechanism of AIS NCs was studied in terms of the temporal evolution of the morphology and crystal structure, and the heterostructured Ag2S-AIS NCs were formed as intermediates during the growth process of AIS NCs. Variation in the Ag/In feeding ratios from 1 : 1 to 1 : 3 led to a broad tuning of the optical band gap and photoluminescence (PL) maximum of AIS NCs, in which very small-sized AIS NCs with a tetragonal phase were obtained. Subsequently, the incorporation of Zn2+ into AIS NCs resulted in the widening of the optical band gap and the shift of the PL maximum to higher energy with the enhancement of the absolute PL quantum yields (PLQYs). When the reaction temperature was increased, the PL emission maximum could be tuned from 2.04 to 2.33 eV and the absolute PLQYs could be tuned from 16% to 58%. Time-resolved PL spectroscopy was used to study the PL decay dynamics of the AIS and AIZS NCs, and the PL emission was related to the recombination of the surface-related states, intrinsic defects and donor–acceptor (D–A) pairs. The ternary and quaternary Ag-based semiconductor NCs have long-lived excitons, which may have promising applications in the field of energy conversion.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）