Nanoscale
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2020
·Vol. 12
·期 16
·9231-9239
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IF 6.895
Xiaolin Xiao,Ye Li,Rong-Jun Xie
Low dimensional semiconductor nanomaterials show great promise for a variety of applications due to their size-dependent and excellent optoelectronic properties. In this work, we developed a strategy to synthesize uniform and very thin CsPbBr3 perovskite nanoplates (NPls) by introducing additional metal bromides. The CsPbBr3 NPls, self-assembled into a face-to-face stacked state, had a thickness of 4.4 nm (equal to only 2 monolayers, 2 MLs) and showed a maximum emission at 437 nm and a narrow FWHM of 14 nm. The formation mechanism of the CsPbBr3 NPls by adding FeBr3 was ascribed to the constrained growth of CsPbBr3 nanocubes when the surface Cs+ ions were substituted by the protonated oleylammonium from the byproduct OLA-HBr.
研究领域:
材料科学
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纳米技术
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光电子学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Xuyong Tian,Dawei Ji,Haowei Feng,Weijia Lin,Chunlei Wang,Liying Wei,Wei Shu,Changfa Xiao
In recent years, with the rapid development of new energy vehicles, the demand for lithium resources has been increasing sharply. Positively charged nanofiltration (NF) membranes can accurately separate magnesium ions (Mg 2+ ) and lithium ions (Li + ), which have become an important technology for extracting lithium resources from salt lakes. The introduction of intermediate layer in thin-film composite (TFC) NF membranes could improve the permeability and selectivity for Mg 2+ /Li + separation. However, there is a problem of poor bonding between the intermediate layer and the supporting membranes through the simple physical combination on the membrane surface. Inspired by the controlled growth of succulent plants, the positively charged PA/ZIF-8/PSF composite NF membranes with “multilayer interlocking” structure were prepared successfully based on ZIF-8 layer anchored constrained growth and further interfacial polymerization. The zinc ion ligands of ZIF-8 were pre-anchored on the PSFsolution to provide reaction sites, and the grown ZIF-8 nanoparticles were embedded in the PSFsupporting membrane surface layer. The embedded ZIF-8 nanoparticles can enhance the interface bonding between the PSFsupporting membranes and the ZIF-8 layer. Additionally, the confined growth method can solve the problems of ZIF-8 particle aggregation and poor dispersion. Compared with membranes without ZIF-8 layer, the prepared PA/M − 6 membrane had a high flux of 47.2 L m −2 h −1 , which was 1.82 times that of PA/M-0. Meanwhile, the Mg 2+ /Li + separation factor of the PA/ZIF-8/PSF composite NF membranes could reach 47.6. In particular, the prepared NF membranes exhibited good long-term stability for Mg 2+ /Li + separation.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2020
·Vol. 9
·期 7
·3976-3984
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IF 11.301
Zhongliang Huang,LongLong Fan,Bin Chen,Shu-feng Zhou,Jiale Huang,Qingbiao Li,Guowu Zhan
The controlled growth of MOF crystals in a confined space has long been a challenge. In this contribution, we present a facile strategy for the confined growth of MOF crystals in a mesoporous silica shell by pre-installing a metal stock inside the cavity while transporting organic linkers through the permeable shell. Remarkably, the size and shape of the confined MOF crystals could be controlled effectively by adjusting the synthesis parameters. The obtained MOF@mSiO2 composites could further be functionalized with a range of surfactant-free metal nanoparticles (MNPs, e.g., Au, Pd, and Ag) via galvanic replacement reactions on the encapsulated Cu2O surface during a one-pot preparation. This led to ultrafine MNPs embedded within the MOF matrix. The construction of the MOF and the galvanic replacement reaction occurred on similar time scales, and the Cu2O cores are believed to play dual roles in the synthesis: (i) providing a source of copper ions for building MOFs, and (ii) serving as a reductant to form noble MNPs which in turn significantly accelerated the formation kinetics of MOF crystals (to within 1 minute). Furthermore, it was also demonstrated that the encapsulated MOFs/MNPs within the mSiO2 shells were highly accessible to the general gas/liquid molecules and exhibited excellent catalytic activity for several oxidation reactions.
研究领域:
材料科学
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化学
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DOI
高影响因子
Polymers
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2020
·Vol. 12
·期 6
·1415
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IF 3.426
Biqin Wu,Shuhao Wang,Jian Wang,Xiaoxiao Song,Yong Zhou,Congjie Gao
The advantages of thin film nanocomposite reverse osmosis (TFN-RO) membranes have been demonstrated by numerous studies within the last decade. This study proposes a facile and novel method to tune the microscale and nanoscale structures, which has good potential to fabricate high-performance TFN-RO membranes. This method involves the addition of alkyl capped silica nanoparticles (alkyl-silica NPs) into the organic phase during interfacial polymerization (IP). We discovered for the first time that the high concentration alkyl-silica NPs in organic solvent isopar-G can limit the diffusion of MPD molecules at the interface, therefore shaping the intrinsic thickness and microstructures of the PA layer. Moreover, the alkyl group modification greatly reduces the NPs agglomeration and increases the compatibility between the NPs and the PA matrix. We further demonstrate that the doping of alkyl-silica NPs impacts the performance of the TFN-RO membrane by affecting intrinsic thickness, higher surface area, hydrophobic plugging effect, and higher surface charge by a series of characterization. At brackish water desalination conditions (2000 ppm NaCl, 1.55 MPa), the optimal brackish water flux was 55.3 L/m2∙h, and the rejection was maintained at 99.6%, or even exceeded this baseline. At seawater desalination conditions (32,000 ppm NaCl, 5.5 MPa), the optimized seawater flux reached 67.7 L/m2∙h, and the rejection was sustained at 99.4%. Moreover, the boron rejection was elevated by 11%, which benefits from a hydrophobic plugging effect of the alkyl groups.Keywords:TFN-RO membrane;alkyl capped silica nanoparticles;confined growth;interfacial polymerisation;desalination
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
International Journal of Nanomedicine
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2023
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IF 8
Limei Qin,Dechao Niu,Yu Jiang,Jianping He,Xiaobo Jia,Wenru Zhao,Pei Li,Yongsheng Li
Introduction In this work, we have developed a novel “confined-growth” strategy to synthesize PEGylated multiple gold nanorices-encapsulated dual-mesoporous silica nanospheres (designated as PEGylated MGNRs@DMSSs) containing both small mesopores (2.5 nm) in the shell and large mesopores (21.7 nm) in the core based on a well-established, seed-mediated growth method. The photothermal effect and CT imaging ability were also studied.Methods The nanoparticles were characterized by Fourier transform infrared (FT-IR) spectra, N2 absorption isotherms, Field-emission scanning electron microscopy (FE-SEM), Transmission electron microscopy (TEM), Inductively coupled plasma atomic emission spectroscopy (ICP-AES) and Confocal microscopy.Results The longitudinally-localized surface (LSPR) absorption properties of MGNRs@DMSSs can be easily tuned by altering the amount of HAuCl4 in the gold growth solution. Additionally, the resultant PEGylated MGNRs@DMSSs have monodispersed, spherical morphology and good colloidal stability in an aqueous solution. More importantly, when exposed to NIR irradiation, the PEGylated MGNRs@DMSSs exhibit both higher temperature increments and better photothermal effects than that of single PEGylated gold nanorods at nearly an equivalent LSPR absorption. In addition, as CT contrast agents, the PEGylated MGNRs@DMSSs display a better CT imaging performance, in comparison with single PEGylated gold nanorods at the same Au concentration.Conclusion Taken together, results indicate the potential for MGNRs@DMSSs used in CT imaging-guided photothermal therapy. Such a simple “confined-growth” strategy within a porous matrix offers a promising platform to design and prepare novel metal(s) oxide@silica nanocomposites for use in further cancer bio-imaging and therapy.
研究领域:
纳米技术
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生物医学工程
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癌症治疗
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医学成像
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产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
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2024
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IF 6.7
ZhaoGuo Wu,XueZhi Zhou,Hao Chen,AiWu Zhao,Jin Wang
Controlling formation of metal organic frameworks (MOFs) with embedded enzymes on magnetic surface has been achieved by a confined growth with particle attachment driven self-sieving approach for the first time. Specifically, a versatile route of silica encapsulation guided enzyme assembly for formation of ZIF-8 shell has been successfully demonstrated by shaped-controllable Fe 3 O 4 nanoparticles , e.g., nanorod and nanocube. Interestingly, silica encapsulation can lead to structural diversity of ZIF-8 shell on the shaped-controllable Fe 3 O 4 nanoparticles for affecting properties of the nanocomposites. Furthermore, embedded enzymes confined between silica endoskeleton and ZIF-8 exoskeleton can participate in cascade reaction with different activities and stabilities in the terms of plasmonic assemblies fabrication and cancer cell catalytic therapy. As a result, a circulation plasmonic fabrication and cancer therapy can be achieved via the magnetic nanocomposites. It can be expected that the confined growth with particle attachment driven self-sieving method can be versatile to generate diverse MOFs shell encapsulated shaped-controllable nanoparticles for efficiently embedding enzyme in the nanocomposites.
研究领域:
材料科学
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纳米技术
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生物技术
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癌症治疗
✓ 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）