MOLECULES
·
2024
·Vol. 29
·期 22
·5317
·
IF 4.2
Haitao Ren,Fan Qi,Xiangbo Feng,Jiaxiang Liu,Yuzhen Zhao
The liquid-phase method is the most commonly utilized strategy for synthesizing fluorescent carbon quantum dots (CQDs). However, the liquid-phase synthesis of CQDs faces challenges such as low yield, complex purification, and the use of toxic solvents, which limit large-scale production and practical applications. In this study, fluorescent CQDs with a high product yield of 78% were synthesized using glucose as a carbon source through a green and facile one-step solid-phase approach, without solvents or post-treatment. A systematic study of the structure and fluorescence properties of the synthesized CQDs was conducted using various characterization techniques. The results indicated that the mean size of obtained CQDs was 4.1 nm, and that their surface had abundant oxygen-containing functional groups, resulting in favorable water solubility. The synthesized CQDs exhibited excitation-dependent fluorescence, with optimal excitation and emission wavelengths at 358 and 455 nm, respectively. Additionally, the CQDs solution showed bright blue fluorescence under 365 nm UV light, with a quantum yield of 6.21% and a fluorescence lifetime of 3.02 ns. This study offers valuable insights into the green and efficient synthesis of fluorescent CQDs powder.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Xiaojing Liu,Yangcheng Lu
Tween 80 coated magnetic polymer nanocomposite particles (NCPs), as functional materials with good biological application prospects, still confront a challenge in high-yield preparation inhibiting either plain polymer particles or aggregates. In this study, we are devoted to make a breakthrough by using emulsion polymerization solely stabilized by nonionic surfactant Tween 80 and initiated by an oil-soluble initiator, 2,2′-azobis(isobutyronitrile). After carefully investigating the effects of Fe3O4, monomer, initiator, and emulsifier dosages on the monomer conversion, encapsulation efficiency, and particle characteristics, we confirm that a low but sufficient Tween 80 dosage relative to the Fe3O4 dosage enables the high-yield synthesis of NCPs. Using a micromixing method to prepare colloidal Fe3O4 clusters at the reduced Tween 80 concentration allows for the production of monodispersed NCPs with considerable monomer conversion and total encapsulation. The mechanism to achieve controlled NCPs synthesis is also revealed by monitoring and analyzing the time profiles of monomer conversion and products morphology.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kai An,Hongyan Jia,Ruobing Cheng,Yong Guo,Xiaohui Liu,Yanqin Wang
Pt-based bimetallic catalysts have gained more and more attention in propane dehydrogenation (PDH), but still suffer from the high cost and poor stability. In this work, a PtCu@S-1 catalyst with an extremely low loading of Pt (0.047 wt%) is prepared by in-situ hydrothermal synthesis and employed in PDH. An excellent productivity (propylene yield: 471.8 molC 3 H 8 ⋅ g Pt -1 ⋅ h −1 ) is achieved at 600 °C with a weight hour space velocity of 25.80 h −1 . After 50 h of reaction at 600 ℃, 0.047Pt0.19Cu@S-1 catalyst still remains sinter-free, with a deactivation rate of only 0.006 h −1 . Various characterizations show that Cu 0 co-existed with Pt 0 in PtCu@S-1 catalyst plays an important role, greatly improved catalyst reactivity and stability. At high weight hour space velocity (44.5 h −1 ), the propylene productivity can reach 1056.4 molC 3 H 8 ⋅ g Pt -1 ⋅ h −1 . This work provides a new way for the design of extremely low Pt-loaded PDH catalysts with excellent performance at high temperatures.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2016
·
IF 0.661
Zhengyi Li,Yuan Chen,Yue Yin,Zhiming Wang,Xiaoqiang Sun
A simple and convenient two-step method has been developed and used to synthesise 25 (4 of which are novel) unsymmetrical N,N′-disubstituted thioureas in water. Alkylamines or variously substituted arylamines reacted smoothly with phenyl chlorothionoformate at room temperature to form thiocarbamates, which were then reacted with another alkyl- or arylamine in water at reflux to afford the unsymmetrical N,N′-disubstituted thioureas in good to excellent yields. Mild conditions, simple work-up, high yields as well as using water as solvent are the major advantages of the method.
研究领域:
有机化学
·
绿色化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 2
·375
·
IF 4.324
Shuling Shen,Junjie Wang,Zhujun Wu,Zheng Du,Zhihong Tang,Junhe Yang
It is difficult to keep the balance of high quality and high yield for graphene quantum dots (GQDs). Because the quality is uncontrollable during cutting large 2D nanosheets to small 0D nanodots by top-down methods and the yield is low for GQDs with high quality obtained from bottom-up strategy. Here, aphanitic graphite (AG), a low-cost graphite contains a large amount of small graphite nanocrystals with size of about 10 nm is used as the precursor of graphene oxide quantum dots (GO-QDs) for the first time. GO-QDs with high yield and high quality were successfully obtained directly by liquid phase exfoliating AG without high strength cutting. The yield of these GO-QDs can reach up to 40 wt. %, much higher than that obtained from flake graphite (FG) precursor (less than 10 wt. %). The size of GO-QDs can be controlled in 2–10 nm. The average thickness of GO-QDs is about 3 nm, less than 3 layer of graphene sheet. Graphene quantum dots (GQDs) with different surface properties can be easily obtained by simple hydrothermal treatment of GO-QDs, which can be used as highly efficient fluorescent probe. Developing AG as precursor for GQDs offers a way to produce GQDs in a low-cost, highly effective and scalable manner.Keywords:graphene quantum dots;aphanitic graphite;low cost precursor;high yield;high quality
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 22
·7810
·
IF 4.927
Qi Zhang,Fengjiao Xu,Pei Lu,Di Zhu,Lihui Yuwen,Lianhui Wang
Two-dimensional (2D) transition metal dichalcogenide nanosheets (TMDC NSs) have attracted growing interest due to their unique structure and properties. Although various methods have been developed to prepare TMDC NSs, there is still a great need for a novel strategy combining simplicity, generality, and high efficiency. In this study, we developed a novel polymer-assisted ball milling method for the efficient preparation of TMDC NSs with small sizes. The use of polymers can enhance the interaction of milling balls and TMDC materials, facilitate the exfoliation process, and prevent the exfoliated nanosheets from aggregating. The WSe2NSs prepared by carboxymethyl cellulose sodium (CMC)-assisted ball milling have small lateral sizes (8~40 nm) with a high yield (~60%). The influence of the experimental conditions (polymer, milling time, and rotation speed) on the size and yield of the nanosheets was studied. Moreover, the present approach is also effective in producing other TMDC NSs, such as MoS2, WS2, and MoSe2. This study demonstrates that polymer-assisted ball milling is a simple, general, and effective method for the preparation of small-sized TMDC NSs.Keywords:high yield;polymer-assisted;ball milling;TMDC nanosheets
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 13
·4866-4872
·
IF 10.182
Feng Tang,Yingzhan Li,Junwen Huang,Jinhong Tang,Xinyi Chen,Hou-Yong Yu,Ying Zhou,Dongping Tang
Cellulose nanocrystals (CNCs) have been widely used in various industries; however, green, efficient, low-cost and recyclable CNC preparation still presents great challenges. Herein, ferric chloride (FeCl3) solution was used as the solvent to develop a green and recyclable preparation system. Owing to the acidic environment provided by FeCl3, which is a Lewis acid, and the hydrolysis-promoting properties of Fe3+, the amorphous area of the cellulose could be rapidly hydrolyzed under a hydrothermal environment to produce CNCs. More importantly, the used FeCl3 solution could be reused after simple separation. Throughout the entire cycle, the solvent concentration and pH changed only slightly. In the scanning electron microscopy (SEM) results, the prepared CNCs showed a “rice-like” shape with typical CNC dimensions (diameter of ∼38 nm and length of ∼440 nm). The yield was ∼92%, which was much higher than the yields of previously reported methods of CNC preparation. Furthermore, the produced CNCs also have excellent thermal stability (Tmax = ∼350 °C). More importantly, the dispersal performance and large specific surface area of the CNCs were studied by using them as a support for PPy. Owing to the residual Fe3+, Py could polymerize uniformly on the surface of the CNCs. Overall, a green and economical method to achieve sustainable mass production of CNC is provided by this work.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 50
·期 2
·562-567
·
IF 4.174
Lubing Qin,Feng Zhang,Xiaoshuang Ma,Yun Tang,Guanyu Ma,Zhenghua Tang
To advance the development of atomically precise Ag and Ag-alloyed nanoclusters, it is critical to develop effective synthetic methods. Herein, we successfully extend the CTAB (cetyl trimethyl ammonium bromide) reverse micelle method to synthesize a high-purity Ag44(p-MBA)30 (p-MBA = para-mercaptobenzoic acid) nanocluster and its corresponding alloy cluster Au12Ag32(p-MBA)30 in a short time (15 min and 5 min), with a high yield of ∼83% and ∼85%, respectively. Furthermore, the mechanism regarding the reverse micelle method has been clearly elucidated. Through characterizing the reaction system by Raman spectroscopy and NMR spectroscopy techniques, it can be revealed that employing CTAB to form reverse micelles to construct a sealed chemical environment is critical for realizing the fast and high-yield synthesis.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 7
·1719-1726
·
IF 6.569
Jinpeng Xin,Fei Jin,Runnan Guan,Muqing Chen,Xiao-Ming Xie,Qianyan Zhang,Su-Yuan Xie,Shangfeng Yang
Endohedral clusterfullerenes featuring the encapsulation of metal clusters within carbon cages exhibit intriguing physical and chemical properties inaccessible to empty fullerenes. Thus far, their syntheses are predominantly fulfilled by using gaseous sources, suffering from low yield, and requiring an additional gas inlet and a heating pretreatment up to 1000 °C. Herein, we employ an ancient pigment, Prussian blue (Fe4[Fe(CN)6]3), as a cheap solid cyanide/nitrogen dual-source, affording the simplified yet high-yield simultaneous syntheses of novel dysprosium (Dy)-based metal cyanide clusterfullerenes (CYCFs) DyCN@C2n and metal nitride clusterfullerenes Dy3N@C2n. Surprisingly, the (CN)− anion of Fe4[Fe(CN)6]3 survives under the extremely high temperature (up to 4000 K) of plasma generated via DC-arc discharge, and functions as the cyanide source of CYCFs. Under the optimized Dy : [CN] : C molar ratio of 1 : 1 : 15, the sum yield of isolated DyCN@C2n (2n = 76, 82) CYCFs produced using Fe4[Fe(CN)6]3 is about 2.8 times higher than that obtained using gaseous N2 source. Moreover, the molecular structures of the three isomers of DyCN@C82 are unambiguously determined by single-crystal X-ray diffraction, indicating that the encapsulated triangular DyCN cluster is tunable due to strong metal–cage interactions. This study paves the way for the low-cost and high-yield syntheses of pricey endohedral fullerenes.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 7
·1313
·
IF 4.967
Qilin Lu,Jiayin Wu,Hanchen Wang,Biao Huang
Fluorescent cellulose nanofibers (FCNFs), with a high yield, were prepared via one-pot hydrolysis and the grafting reaction of cellulose with thiazolipyridine carboxylic acid (TPCA). The hydrolysis and Fischer esterification of cellulose were conducted under microwave-hydrothermal conditions; meanwhile, TPCA formation was induced by the dehydration reaction between L-cysteine and citric acid. The effects of the reaction temperature and reaction time on the yield and performance of FCNF were investigated. The morphology and size, surface chemical property, crystal structure, thermostability, and fluorescent performance of FCNF were characterized. The results revealed that the yield of FCNF reached 73.2% under a microwave power of 500 W, reaction temperature of 110 °C, and reaction time of 5 h. The FCNF obtained presents a short rod-like morphology. The crystallinity of the FCNFs is 80%, and their thermal stability did not decline significantly. Additionally, the fluorescent performance of the FCNFs is excellent, which results in them having good sensitivity to chloride ions. The good fluorescent performance and significant responsiveness to chloride ions of FCNFs lead to them having broad prospects in bio-labeling, biosensing, information storage, chloride ion detection, among others.Keywords:fluorescent cellulose nanofibers;high yield;one-pot;green preparation;chloride ion detection
研究领域:
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2016
·
IF 0.661
Haidong Liu,Bo Chen,Jin Cai,Junqing Chen,Min Ji
Eleven trifluoromethylated amines were synthesised in high yield (up to 98%) under metal-free and oxidant-free conditions using iminium salts as starting material and the addition of trifluoromethyltrimethylsilane in dimethylformide containing potassium fluoride.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jingkun Wang,Yanqin Miao,Ze Lu,Qi Zhang,Wenhao Guo,Min Zhao,Xinping Zhai,Huayun Du
Stanene nanodots (SnNDs) derived from layered tin have attracted considerable interest due to their conveniently tunable bandgap and topological superconductivity. However, high-yield exfoliation of ultrathin SnNDs is still a challenge due to the short layer spacing and strong binding energy. In this work, atomically thin SnNDs with a uniform size of 2.3 nm are successfully prepared by utilizing imidazolium ionic liquid-assisted exfoliation. The obtained SnNDs possess a wide bandgap of 2.69 eV, along with notable solvent compatibility (well dispersed in both polar and nonpolar solvents) and excellent stability. Furthermore, we construct Ir(ppy)3-based green OLED with hybridizing SnNDs and graphene oxide (GO) as the hole injection layer (HIL). It proves that the application of SnNDs helps to modulate the work function and passivate surface defects of GO, increasing hole mobility and thereby improving the device performance. Compared to the PEDOT:PSS-based control device, the optimized SnNDs-GO-based OLED demonstrates an improvement of 6.56, 41.06, and 8.16% in current efficiency (CE), power efficiency (PE), and external quantum efficiency (EQE), respectively. This work not only introduces a new approach to preparing 2D SnNDs but also creates a novel HIL material for OLED devices.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）