CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yi Xia,Jie Shi,Qian Sun,Dan Wang,Xiao-Fei Zeng,Jie-Xin Wang,Jian-Feng Chen
Colloidal nanocrystals can offer exquisite control of physical and chemical properties for technological applications by tuning their sizes, shapes and crystal forms. Herein, a convenient phase-transfer route was presented to controllably prepare transparent dispersions of monodispersed ZrO 2 nanocrystals in an aqueous-organic two-phase medium. By adjusting the surfactants, solvents and basicity, the controllability of crystal forms from monoclinic to tetragonal phases, the particle length from 5 to 20 nm, and the different shapes including spindle, cobblestone, sphere, branch, rod and cube can be achieved. The as-prepared ZrO 2 nanocrystals can be readily dispersed in nonpolar solvents, thereby forming the ultra-highly concentrated (60 wt%), highly stable (>18 months) and highly transparent nanodispersions. Density functional theory (DFT) calculations were further used to elucidate the root causes of underpinning growth mechanisms. This work not merely enriches the methodology of controllable fabrication of monodispersed sub-10 nm ZrO 2 nanocrystals, but also enables a platform to synthesize rare-earth-doped nanophosphors using ZrO 2 as the host matrix. The fluorescent ZrO 2 :Yb 3+ /Er 3+ nanocrystals, which can be easily monodispersed in organic solvents, were also prepared with visible luminescene properties under near-infrared irradiation.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Hanwen Lai,Xiaohui Zhang,Guangcheng Huang,Yadong Liu,Weihua Li,Shengxiang Ji
Directed self-assembly (DSA) of block copolymers (BCPs) is an effective approach for the fabrication of sub-10 nm features for semiconductor devices. Although many high-χ BCPs have been developed for DSA, the majority of them has a significant difference in surface energies (γs) between two blocks. Here we report the synthesis and self-assembly of poly (styrene- b -vinyl acetate) (PS- b -PVAc). PS- b -PVAc has a higher Flory-Huggins interaction parameter (χ) than poly (styrene- b -methyl methacrylate) (PS- b -PMMA) and the smallest achievable period ( L O ) is 18.2 nm. PS and PVAc have nearly equal γs and a perpendicular orientation of domains is obtained on random copolymer brushes under thermal annealing. DSA of PS- b -PVAc (SV-1 and SV-2) is successfully demonstrated in the thin films on chemical patterns, and the feature size down to 9.5 nm is obtained in DSA of SV-4 with 2 × density multiplication. These results demonstrate that PS- b -PVAc could be a candidate BCP for next-generation DSA lithography.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AEROSOL SCIENCE
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2021
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IF 3.433
Yiliang Liu,Michel Attoui,Yueyang Li,Jianmin Chen,Qing Li,Lin Wang
A butanol-based fast condensation particle counter (Fast CPC, Model 3650, Kanomax Inc., Japan) was characterized in this study with three different types of monodisperse particles, including positively and negatively charged nickel-chromium (Ni/Cr) particles, positively charged tetraheptyl ammonium bromide (THABr) and tetrabutyl ammonium bromide (TBABr) particles, and positively charged polyethylene glycol (PEG) particles. The PEG particles were characterized with varied numbers of charges, whereby the charge number effect on particle activation was investigated. The performance of the Fast CPC was compared with a TSI® 3775 CPC and a TSI® 3776 CPC, respectively, under both factory temperature settings and boosted temperature settings, the latter of which corresponded to the brink of butanol homogeneous nucleation. Our results show that size-resolved Ni/Cr particles were detected by the Fast CPC with comparable detection efficiencies regardless of the charge polarity. When the charge number on a PEG particle increased from 1 to 3, an increasing tendency of the detection efficiency was observed, hinting that multiple charges on a particle will facilitate its activation. Particle activation was affected by the particle chemical composition as well, which is suggested by the higher activation efficiencies of PEG particles than those of Ni/Cr particles. The effects of multiple charges and chemical composition on particle activation were both more significant under factory temperature settings, but became less pronounced under boosted temperature settings. In addition to a quicker response time, the Fast CPC was capable of detecting sub-3 nm particles under boosted temperature settings, with the detection efficiency higher than that of the 3775 CPC but lower than that of the 3776 CPC, and can be used as a good candidate for the measurement of rapidly varying concentrations of small particles.
研究领域:
大气科学
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仪器科学与技术
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产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 34
·2300801
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IF 13.3
Chen Chen,Quan-Wei Cai,Cai-Zhen Zhan,Bi-Cong Wang,Ping-Fan Li,Rui Xie,Xiao-Jie Ju,Zhuang Liu,Wei Wang,Liang-Yin Chu
Sub-10 nm nanoparticles are known to exhibit extraordinary size-dependent properties for wide applications. Many approaches have been developed for synthesizing sub-10 nm inorganic nanoparticles, but the fabrication of sub-10 nm polymeric nanoparticles is still challenging. Here, a scalable, spontaneous confined nanoemulsification strategy that produces uniform sub-10 nm nanodroplets for template synthesis of sub-10 nm polymeric nanoparticles is proposed. This strategy introduces a high-concentration interfacial reaction to create overpopulated surfactants that are insoluble at the droplet surface. These overpopulated surfactants act as barriers, resulting in highly accumulated surfactants inside the droplet via a confined reaction. These surfactants exhibit significantly changed packing geometry, solubility, and interfacial activity to enhance the molecular-level impact on interfacial instability for creating sub-10 nm nanoemulsions via self-burst nanoemulsification. Using the nanodroplets as templates, the fabrication of uniform sub-10 nm polymeric nanoparticles, as small as 3.5 nm, made from biocompatible polymers and capable of efficient drug encapsulation is demonstrated. This work opens up brand-new opportunities to easily create sub-10 nm nanoemulsions and advanced ultrasmall functional nanoparticles.
研究领域:
材料科学
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纳米技术
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制药工程
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产品关联
DOI
PubMed
高影响因子
Advanced Materials Technologies
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2023
·Vol. 8
·期 17
·2300367
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IF 6.8
Yongxing Lin,Pengfei Qi,Jincheng Liu,Yizhi Zhuo,Cheng Cai,Haibao Zhang,Xiangyang Li,Xianglan Liu,Lin Chen,Sihai Luo,Xingyou Tian
Large-area gold-coated polyamide 66 (PA66) nanopillar (PA66NP@Au) arrays consisting of secondary lamellar structures and sub-10–nm gaps are fabricated for surface-enhanced Raman spectroscopy (SERS) using ultrathin anodized aluminum oxide (AAO) template, solution-phase growth of PA66 lamellae, and Au sputtering. Such closely packed PA66NP@Au arrays with high density of electromagnetic field enhancement (“hot spots”) on large area exhibit high SERS sensitivity for detection of rhodamine 6g (R6G) molecules with concentration down to 10 −14 m and a large Raman analytical enhancement factor (AEF) of ≈10 10 . Furthermore, the as-fabricated PA66NP@Au arrays provide highly sensitive Raman signals in detection of a commonly pesticide residue, carbendazim with a limit of detection (LOD) of 0.05 mg L −1 (0.05 ppm), which is lower than that of maximum residue limit of 0.2 ppm allowed in Europe Union. The as-fabricated PA66NP@Au arrays are promising for highly sensitive and uniform SERS detection.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2020
·Vol. 37
·期 8
·2000164
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IF 3.099
Liwei Su,Linhui Liu,Jinpei Hei,Huan Chen,Lianbang Wang,Yuanhao Wang,Manman Ren
V 2 O 5 , as a lithium-free cathode material, has inherent defects such as sluggish kinetics and volume change and, at the same time, requires a lithium metal anode that tends to form dendrites in liquid electrolytes. Both the lithium dendrite and the flammable electrolyte solvent bring longtime safety issues. This work introduces nonflammable inorganic–organic composite solid electrolyte to inhibit the growth of the lithium dendrite and suppress the instability caused by V 2 O 5 nanometerization. However, the long-term cycling and rate performances are still insufficient even when reducing V 2 O 5 size to about 50 nm. As an improvement, sub-10 nm V 2 O 5 /C nanosheets are designed and prepared using corn stalks as precursors through simple impregnation and calcination process. The V 2 O 5 /C offers a much better electrode/electrolyte contact and interface stability than bulk V 2 O 5 and commercial V 2 O 5 in the inorganic–organic composite solid electrolyte. The discharge capacity is 228 mAh g −1 at 0.1 C after 50 cycles and ≈110 mAh g −1 at 2.0 C.
研究领域:
材料科学
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电化学
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纳米能源
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固态电池
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电极材料设计
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Huirong Zou,Wenjuan Zhu,Jingtao Zhao,Su Zhou,Shiqing Xu,Lei Lei
Lanthanide-doped fluoride nanoscintillators (NSs) have emerged as promising candidates for X-ray imaging. However, strong afterglow, long lifetime, and poor irradiation stability pose key challenges for real-time dynamic X-ray imaging. In this study, the sub-10 nm Lu 6 O 5 F 8 :Tb NSs with tunable morphologies are prepared via incorporating Li + /Na + ions. The X-ray excited optical luminescence (XEOL) intensity of the Lu6O5F8:15Tb/10Li NSs is stronger than that of NaLuF 4 :15 Tb NSs with a similar particle size while its afterglow is only ≈2.7% compared to that of NaLuF 4 :15 Tb NSs. Utilizing the Lu 6 O 5 F 8 :15 Tb/10Li NSs-integrated film as a scintillator screen, a high resolution of ≈21.6 lp/mm is achieved. Even at a low dose of 0.23 µGy, the fringe detail in the electron device is clearly observed in the X-ray image. The afterglow intensity of the Lu 6 O 5 F 8 :10Eu/10Li NSs decays to 0.7% at 40 µs, which is better than that of CsI:Tl (3.6%@40 µs). Moreover, the Lu 6 O 5 F 8 :10Eu/10Li NSs with a lifetime of 1.65 µs are verified for use in dynamic 3D X-ray imaging. These findings represent a significant advancement in the development of new NSs for high-performance dynamic X-ray imaging.
研究领域:
材料科学
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纳米技术
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医学成像
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2019
·Vol. 15
·期 15
·2341-2345
·
IF 3.698
Junjun Hou,Meihuizi Jiang,Xiao He,Pengchao Liu,Chang Long,Lian Yu,Zhiwei Huang,Jin Huang,Lianshan Li,Zhiyong Tang
Graphical A sub-10 nm polyamide nanofiltration membrane was synthesized through interfacial polymerization due to the extremely low solubility of the ethidium bromide monomer in organic phase, which strictly limits the polymerization process at the interface of the water and hexane. Thanks to the ultrathin thickness, these membranes show excellent water permeance and high dye rejection. To separate small molecules from the solvent with high permeability and selectivity, the membrane process is thought to be highly effective with much lower energy consumption when compared to the traditional thermal-based separation process. To achieve high solvent permeance, a sub-10 nm thick polyamide nanofiltration membrane was synthesized through interfacial polymerization of ethidium bromide (EtBr) and trimesoyl chloride (TMC). Thanks to the extremely low solubility of the EtBr monomer in the organic phase, the polymerization process was strictly limited at the interface of the water and hexane, leading to an ultrathin polyamide membrane with a thickness down to sub-10 nm. When used in nanofiltration, these ultrathin membranes display ultrafast water permeation of 40 liter per square meter per hour per bar (L m −2 h −1 bar −1 ), and a high Congo red rejection rate of 93 %. This work demonstrates a new route to synthesize ultrathin polyamide membranes by the traditional interfacial polymerization.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Qianqian Lan,Chao Feng,Kaiqin Ou,Zicheng Wang,Yong Wang,Tianxi Liu
Membranes with sub-10-nm pores are receiving growing interest in recognizing and separating nanocolloids , biomolecules, and soluble salts from water, but suffer from difficulty of optimizing pore structures and inferior stability. Herein, we report an efficient method for the preparation of robust nanoporous phenolic membranes with widely tunable pore sizes in the range of nanofiltration and tight-ultrafiltration. Solutions of resol precursors and poly(ethylene glycol)s (PEGs) are spin-coated to form thin films and then heated to thermopolymerize resols into phenolics. Subsequently, the films are treated in H 2 SO 4 solution to degrade PEGs, producing nanoporous phenolic membranes. Thus-prepared phenolic membranes exhibit adjustable effective pore sizes and tunable separation performances from nanofiltration to tight-ultrafiltration, which is otherwise inaccessible. Due to the thin thicknesses and rich water channels, the membranes exhibit higher permeances than other tight-ultrafiltration membranes and commercial ultrafiltration membranes with similar rejections. Furthermore, thanks to the robust frameworks and good chemical resistance of phenolics, the membranes deliver stable performances in long-term operations, elevated pressures, and acidic conditions. This work provides a facile and universal strategy for the synthesis of membranes with sub-10-nm pores for nanofiltration and tight-ultrafiltration.
研究领域:
材料科学
·
环境工程
·
膜技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 22
·期 6
·2632-2640
·
IF 5.101
Daqin Chen,Yunlong Yu,Feng Huang,Hang Lin,Ping Huang,Anping Yang,Zhaoxing Wang,Yuansheng Wang
We present a novel strategy involving the lanthanide dopant-induced formation of ultrasmall (sub-10 nm) uniform Ln3+:BaF2/Ln3+:SrF2 active-core/active-shell architectures. The lanthanide ions doped in the shell are demonstrated to play a key role to retard the growth of the core/shell nanocrystals. Particularly, adopting ∼3 nm Tm3+,Yb3+:BaF2 nanocrystals as cores prepared by a solvothermal reaction, growth of Gd3+,Nd3+:SrF2 shells is successfully induced on the surfaces of these cores through a thermal decomposition process, forming ∼7 nm highly uniform and monodisperse Tm3+,Yb3+:BaF2/Gd3+,Nd3+:SrF2 active-core/active-shell nanocubes. In this architecture, the Gd3+,Nd3+:SrF2 shell not only benefits the enhancement of the near-infrared to near-infrared upconversion luminescence of the Tm3+,Yb3+:BaF2 core, but also acts as the host to realize the near-infrared to near-infrared downconversion luminescence of Nd3+ dopants and the paramagnetism of Gd3+ ones. Importantly, the doping of Tm3+/Yb3+ and Nd3+ into the core and shell respectively effectively suppresses the adverse energy transfer from Tm3+ to Nd3+ as well as from Nd3+ to Yb3+, resulting in lessening of the quenching for both Tm3+ upconversion and Nd3+,Yb3+ downconversion emissions. These hydrophobic core/shell nanocrystals are further converted into hydrophilic ones using thioglycolic acid as the surface ligand. The sub-10 nm water-soluble active-core/active-shell architectures with near-infrared to near-infrared dual-modal luminescence and proper paramagnetism may find potential applications in biomedical imaging and detection.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
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）