JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2012
·Vol. 12
·期 9
·7280-7283
·
IF 1.563
Yang Renchun,Tang Dingxing,Ma Fengyun,Tao Ting Xian,Ren Yiming,Chen Zhiming,Zhang Cuige,Li Fang
A facile one-pot route for the synthesis of monodisperse Ag nanocrystals with a narrow size distribution is described. Uniform Ag nanoparticles with the size of around 12 nm were obtained by reduction of AgNO3 in the presence of oleylamine and polymer polyvinylpyrrolidone
(PVP) at low temperature. It is found that temperature has a significant effect on the sizes and the size distributions of the nanoparticles. Because irregular Ag nanoparticles are produced easily due to Ostwald ripening or kinetic control at both high temperature and low temperature, respectively,
uniform nanocrystals can be obtained at an appropriate temperature (70 °C).
研究领域:
纳米材料科学
·
化学合成
✓ 已验证
DOI
PubMed
高影响因子
Nano Research
·
2021
·Vol. 15
·期 1
·446-451
·
IF 8.897
Yu Yongsheng,He Lin,Xu Junjie,Li Jiaming,Jiang Sida,Han Guanghui,Jiang Baojiang,Lei Wenjuan,Yang Weiwei,Hou Yanglong
The ordered Pt-based intermetallic nanoparticles (NPs) with small size show superior magnetic or catalytic properties, but the synthesis of these NPs still remains a great challenge due to the requirement of high temperature annealing for the formation of the ordered phase, which usually leads to sintering of the NPs. Here, we report a simple approach to directly synthesize monodisperse ordered L1 0 -FePt NPs with average size 10.7 nm without further annealing or doping the third metal atoms, in which hexadecyltrimethylammonium chloride (CTAC) was found to be the key inducing agent for the thermodynamic growth of the Fe and Pt atoms into the ordered intermetallic structure in the synthetic process. In particular, 10.7 nm L1 0 -FePt NPs synthesized by the proper amount of CTAC show a coercivity of 3.15 kOe and saturation magnetization of 45 emu/g at room temperature. The current CTAC-assisted synthetic strategy makes it possible to deeply understand the formation of the ordered Pt-based intermetallic NP in solution phase synthesis.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 7
·1-9
·
IF 2.009
Zhang Aiqin,Xiao Yuanhua,Das Paramita,Zhang Linsen,Zhang Yong,Fang Hua,Wang Lixia,Cao Yang
Silver nanoparticles (AgNPs), especially with small size, are easy to release silver ion in aqueous solution owing to various reasons, which would significantly affect the stability, properties, and application of AgNPs. In this paper, monodisperse AgNPs with small size of ca. 10 nm were successfully prepared based on solid-state reactions. Ascorbic acid (AA) was used as reductant and tannic acid (TA) was used both as reductant and stabilizer in this environmentally friendly reaction. The dissolution and regeneration of the as-prepared TA-AgNPs in pure water were investigated by UV−vis spectra, TEM observations, and differential pulse anodic stripping voltammetry. The results indicated that the TA-AgNPs showed a little higher dissolution than conventional PVP-coated ones with similar size. However, the dissolved silver ion in the TA-AgNPs aqueous solution could be recovered just by adjusting the pH of the solution, which could be attributed to the reductant performance of TA at alkaline conditions. After regeneration, some smaller nanoparticles appeared in TA-AgNPs aqueous solution, indicating that new nucleation formed and the dissolved silver ions were actually recovered to Ag 0 .
Graphical abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 3
·1-6
·
IF 2.02
Chen Shun,Ju Yanyun,Guo Yi,Xiong Chuanxi,Dong Lijie
Ag NPs were in-site synthesized through microemulsion method by reducing silver acetate with oleylamine-mediated at 70 °C with highly monodisperse and narrow size from 10 to 20 nm. The synthesis of Ag NPs was aided by oleylamine and the role of oleylamine was researched. This in-site synthesis approach to Ag NPs was reproducibility and high yield more than 80% with stable store about 6 months.
研究领域:
纳米材料
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanoelectronics and Optoelectronics
·
2023
·Vol. 18
·期 3
·287-292
·
IF 0.6
Song Shixin,Zhang Mu,Li Xiaodong,Sun Xu-Dong,Fouad Hassan,Akhtar M. S.
In this study, the sol–gel method was used to prepare well-monodispersed ZnS nanopowders with a powder size of approximately 0.5 μm. The starting materials used were Zn(NO3)2 · 6H2O and C2H5NS. However, the
agglomeration problem of the powders was addressed by adding an appropriate amount of (C6H9NO)n. The sol–gel method successfully produced submicron-sized ZnS powders. To further reduce the powder particle size, a rapid co-phase precipitation method was employed.
This method involved using ZnCl2 and C2H5NS, which yielded ZnS nanopowders with a particle size of approximately 50 nm. The key focus of this method was on selecting the precipitating agent and emulsion to control the precipitation of ZnS nanoparticles. Both
methods resulted in finer powder particle sizes and higher powder purity compared to commercial ZnS powders. These improvements in the optical and mechanical properties of ZnS IR-transmitting ceramics are significant. Overall, this study demonstrates the effectiveness of using these methods
for synthesizing high-quality ZnS nanopowders.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yumeng Shi,Jiayi Tang,Wenyu Yan,Yan Liu,Yuchun Liu,Huan Chen,Cheng Yang,Chunhuan Liu,Rong Liang
Oleogels have been explored as a new lipid-based delivery system, however, their insolubility and unsuitable shape severely limit their application in food systems. Herein, core-shell oleogel capsules with high monodispersity (coefficient variation (CV) < 5%)) were prepared via gravity-assisted co-flowing microfluidic device and simply air-drying. The oleogel capsules with oleogel core and ultrathin calcium-alginate shell were prepared. Oleogel capsules maintained their original shape at pH = 2.0 but swelled rapidly at pH = 6.8 and 7.4. The swelling ratio of shell can be adjusted by inner fluid flow rate ( Q in ). Notably, the core with beeswax (BW) crystal network, effectively improved the stability performances and also could provide thermal response. Finally, the oleogel capsules demonstrated excellent sustained release and UV protection of lipophilic bioactives. This work sheds light on development of novel oleogel capsules, making them ideal candidates for smart food encapsulation applications.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Yue-Qi Liu,Wen-Hao Pan,Lin-Xia He,Chenglong Han,Tong Lu,Ning-Ning Zhang,Kun Liu
Graphical AlH 3 ·(NMP) x complexes with varying coordination numbers were synthesized. AlH 3 ·(NMP) 1.0 single crystals were isolated from AlH 3 ·(NMP) x mixtures, and successfully elucidated the structure of AlH 3 ·(NMP) 1.0 through single-crystal X-ray diffraction. The coordination number of AlH 3 ·(NMP) x modulates the morphology of Al nanoparticles. AlH 3 ·(NMP) 1.0 exhibited the fastest decomposition rate, yielding highly monodisperse Aluminum nanoparticles (Al NPs) with well-defined shapes and the narrowest size distribution. The controlled chemical synthesis of aluminum nanocrystals (Al NCs) is crucial for their applications in plasmonics, photocatalysis, and optoelectronics. However, there is still a lack of correlation between the precursor of Al hydride N-methylpyrrolidine (AlH 3 ·(NMP) x ) and the Al NC synthesis outcomes. Here, we report the synthesis of AlH 3 ·(NMP) x complexes with different coordination numbers (x from 1.0 to 2.0) and their characterization as precursors regulating the morphology of Al NCs. We isolated AlH 3 ·(NMP) 1.0 single crystals from AlH 3 ·(NMP) x mixtures and successfully elucidated the structure of AlH 3 ·(NMP) 1.0 through single-crystal X-ray diffraction. Importantly, AlH 3 ·(NMP) 1.0 exhibited the fastest decomposition rate, yielding highly monodisperse Al NCs with well-defined shapes and the narrowest size distribution, while higher coordination numbers led to increased dispersity in size and irregular morphologies. Additionally, we observed distinct multipole plasmonic resonances in Al NCs synthesized from lower coordination number precursors, highlighting their superior optical properties. This work establishes a direct correlation between precursor coordination chemistry and Al NC synthesis outcomes, providing a foundation for optimizing nanoparticle production for advanced material applications.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 5
·055013
·
IF 1.449
Lin Chu,Wenbin Niu,Suli Wu,Wei Ma,Bingtao Tang,Shufen Zhang,Heping Li,Zheng Liu
Owing to the simultaneous occurrence of nucleation and nuclei aggregation in nanoprecipitation approach, the preparation of monodisperse nanospheres from polysaccharide remains a great challenge. Herein a two-step approach is presented for size controlled preparation of monodisperse polysaccharide-based nanospheres with PDI of 0.05 from starch acetate (SA). First, the starch acetate nanospheres (SANs) with average size in the range from 100 to 160 nm were produced by a moderate and constant hydrophobic interaction (MCHI) process. Second, based on principle of Ostwald ripening, a facile hydrothermal method was employed to modulate the size of the SANs obtained from the first step, yielding monodisperse nanospheres ranging from 200 to 1400 nm. This two-step method was also successfully applied to the preparation of ethyl cellulose nanospheres, which provided a facile strategy to prepare nanospheres from polysaccharides. Finally, SANs (744 nm) and ECNs (802 nm) were used to fabricate 2D photonic crystals by self-assembly, further verifying high monodispersity of obtained polysaccharide-based nanospheres.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 29
·期 1
·1-8
·
IF 3.097
Li Liying,Feng Jianhua,Shao Ningning,Shen Chen
A amphiphilic and biodegradable block copolymer is obtained by introducing hydrophilic polyethylene glycol segments into the segments of polyamino acids through copolymerization. And the block copolymers, poly(L-phenylalanine)-b-poly(ethylene glycol), are used to fabricate silica materials through Evaporation-Induced Self-Assembly method. In the synthesis procedure, anilino-methyl triethoxy silane is used as an intermedium, on the one hand it interacts with polypeptide-based copolymer through π-π interaction between the phenyl groups of phenylalanine segments and anilino-methyl triethoxy silane; on the other hand, anilino-methyl triethoxy silane can co-condense with tetraethoxylsilane through hydrolysis process. The prepared silica possesses supermicropores and it is proposed that the supermicropores are templated by the polypeptide segments. It is proved that both polypeptide-based block copolymer and anilino-methyl triethoxy silane play important roles in the formation of mesoscale short-range-order and hierarchical structure. When the phenylalanine segment of block copolymer is longer, it can induce a well-defined shuttle-like morphology of polymer/silica hybrid particles.
研究领域:
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 6
·655-663
·
IF 2.4
Wang Zhen,Leng Kangwei,Liu Jiuhong,Li Yueqiu,Liu Shucheng,Li Yan,Wang Zhongwei,Yu Qing,Han Yuxi
Poly(methyl methacrylate) microspheres with narrow particle size distribution were synthesized successfully under visible light (LED@420 nm) in this study, and no RAFT agent was involved. A novel acylphosphine oxide, (2,4-dimethylphenyl) phenylphosphine oxide (2,4-DMTPO), was used as the photoinitiator. Uniform microspheres with the weight-average diameter (D w ) of 1.03 μm and polydispersity index (PDI) of 1.06 were obtained upon irradiation for 30 min, when the ratio of methyl methacrylate (MMA) to solvent was 1:10, the amount of polyvinylpyrrolidone (PVP) and 2,4-DMTPO was 30 wt% and 2 wt% of MMA, respectively. However, no microspheres could be detected instead of large blocks when (2,4,6-trimethylbenzoyl) diphenylphosphine oxide (TPO) was the photoinitiator under the same condition. It could be due to the higher light absorption ability and quantum yield of 2,4-DMTPO at 420 nm than TPO. A possible formation mechanism of PMMA microspheres was proposed and the effects of photoinitiator, MMA, irradiation time, and PVP were discussed. Results shown that regular microspheres were formed when the irradiation time exceeded 30 min, and the amount of PVP was in the range of 25 to 40 wt% of MMA. Lowering the amount of photoinitiator to 0.5 wt% resulted in ca. 66% and 4% decrease of D w and PDI, respectively. This study may provide a rapid and energy saving way of synthesizing monodispersed PMMA microsphere, which would be benefit for the fields of coating, template, and so on.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 9
·期 1
·91-98
·
IF 7.76
Jing Liu,Guanying Chen,Shuwei Hao,Chunhui Yang
The ability to fabricate lanthanide-doped upconversion nanocrystals (UCNCs) with tailored size and emission profile has fuelled their uses in a broad spectrum of biological applications. Yet, limited success has been met in the preparation of sub-6 nm UCNCs with efficient upconversion photoluminescence (UCPL), which enable high contrast optical bioimaging with minimized adverse biological effects entailed by size-induced rapid clearance from the body. Here, we present a simple and reproducible approach to synthesize a set of monodispersed hexagonal-phase core NaGdF4:Yb/Ln (Ln = Er, Ho, Tm) of ∼3–4 nm and core/shell NaGdF4:Yb/Ln@NaGdF4 (Ln = Er, Ho, Tm) UCNCs of ∼5–6 nm. We show that the core/shell UCNCs can be up to ∼1000 times more efficient than the corresponding core UCNCs due to the effective suppression of surface-related quenching effects for the core. The observation of prolonged PL lifetime for the core/shell than that for the core UCNCs demonstrates the role of the inert shell layer for the protection of the core. The achievement of sub-6 nm NaGdF4 UCNCs with significantly improved luminescence efficiency constitutes a solid step towards high contrast UCPL optical imaging with secured biological safety.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 36
·1801095
·
IF 9.598
Hai-Tao Liu,Hui Wang,Wen-Bo Wei,Hui Liu,Lei Jiang,Jian-Hua Qin
Droplet microfluidics has been widely applied in functional microparticles fabricating, tissue engineering, and drug screening due to its high throughput and great controllability. However, most of the current droplet microfluidics are dependent on water-in-oil (W/O) systems, which involve organic reagents, thus limiting their broader biological applications. In this work, a new microfluidic strategy is described for controllable and high-throughput generation of monodispersed water-in-water (W/W) droplets. Solutions of polyethylene glycol and dextran are used as continuous and dispersed phases, respectively, without any organic reagents or surfactants. The size of W/W droplets can be precisely adjusted by changing the flow rate of dispersed and continuous phases and the valve switch cycle. In addition, uniform cell-laden microgels are fabricated by introducing the alginate component and rat pancreatic islet (β-TC6) cell suspension to the dispersed phase. The encapsulated islet cells retain high viability and the function of insulin secretion after cultivation for 7 days. The high-throughput droplet microfluidic system with high biocompatibility is stable, controllable, and flexible, which can boost various chemical and biological applications, such as bio-oriented microparticles synthesizing, microcarriers fabricating, tissue engineering, etc.
研究领域:
生物工程
·
材料科学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）