Nanoscale
·
2020
·Vol. 12
·期 8
·5075-5083
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IF 6.895
Yu Dai,Dongpeng Yang,Danping Yu,Songhai Xie,Biwei Wang,Juan Bu,Bin Shen,Wei Feng,Fuyou Li
Fabricating lanthanide doped up-conversion luminescence based nanocomposites has drawn increasing attention in nanoscience and nanotechnology. Although challenging in precise synthesis, structure manipulation and interfacial engineering, fabricating dendritic mesoporous silica coated up-conversion nanoparticles (UCNP@dMSNs) with a tunable pore size is of great importance for the functionalization and application of UCNPs. Herein, we report a strategy to prepare uniform monodisperse UCNP@dMSNs with a core–shell structure. The silica shell has tunable center-radial and dendritic mesoporous channels. The synthesis was carried out in the heterogeneous oil–water microemulsion phase of the Winsor III system reaction system, which allows silica to be deposited directly on hydrophobic UCNPs through the self-anchoring of micelle complexes on the oleic acid ligand. The average pore size of UCNP@dMSNs could be tailored from ∼10 to ∼35 nm according to the varied amounts of co-solvent in the mixture. The microemulsion approach could also be used to prepare hierarchical UCNP@dMSNs with a multi-generational mesostructure. The resultant UCNP@dMSNs exhibit the unique advantage of loading “guest” nanoparticles in a self-absorption manner. We proved that Cu1.8S NPs (∼10 nm), Au NPs (∼10 nm) and Fe3O4 NPs (∼25 nm) could be incorporated in UCNP@dMSNs, which in turn validates the high adsorption capacity of UCNP@dMSNs.
研究领域:
纳米科学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Chen Cheng,Rendang Yang,Yang Wang,Danning Fu,Jie Sheng,Xiaohui Guo
Bacterial cellulose (BC) lithium-ion batteries separators possess outstanding thermal dimensional stability and electrolyte wettability, but theirs nano diameter and high aspect ratio lead to poor porosity and pore size uniformity of dense BC separators, limiting the Li + transmission in the separators. In this paper, chitosan (CS) with different molecular weight was grafted onto BC (named OBCS), and a high-performance OBCS separator with excellent pore structure and tunable pore size was prepared by simple suction filtration. The spacing and dispersion uniformity of OBCS were improved by the CS grafted on BC surface, thus improving the pore structure and porosity of OBCS separators. The results showed that the obtained OBCS separators not only have excellent physicochemical properties, but also exhibit higher electrochemical performances than the commercial polypropylene (PP) separator. This work provides a new feasible strategy for improving the pore structure and porosity of nanocellulose separators.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Xian-peng Zhang,Jian Luo,Da-xia Zhang,Tong-fang Jing,Bei-xing Li,Feng Liu
In this paper, porous microcapsules with tunable pore sizes were prepared using interfacial polymerization by employing a temperature-responsive cross-linking agent above its so-called cloud point temperature ( T scp ). The influences of porosity on the surface morphology , release profile and biological activity of the microcapsules were investigated. The results showed that both pore size and pore density could be controlled by regulating either the amount of cross-linking agent or the ratio of core material to shell material. Furthermore, the porosity of the microcapsules determined their release properties and further regulated the bioactivity of the microcapsules. In addition, the mechanism of pore formation was confirmed by investigating the morphology of microcapsules below the T scp . The microencapsulation methodology described here is convenient and versatile, which can be easily extended to encapsulate a broad range of lipophilic core materials.
研究领域:
药剂学
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生物材料
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纳米医学
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药物递送
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高分子科学
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DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 39
·2508391
·
IF 26.8
Qinyi Ren,Kun Ni,Zhiqi Wang,Chenkai Zhang,Shanfei Liu,Ruiyuan Liu,Xiaohong Zhang
Hydrovoltaic electricity generators represent an emerging technology for converting low-grade water-based energy into electricity, and hydrogels are favored for their water absorption and ion-responsive properties. However, the controllable fabrication and precise micromorphological characterization of nanoporous hydrogels remain challenging, hindering the understanding of ion transport within confined water channels. In this work, a nanoporous hydrogel with tunable pore sizes is presented, developed through a multiple hydrogen-bonding crosslinking strategy using γ-polyglutamic acid and hydroxylated carbon nanotubes. The pore size can be systematically tuned from 78 to 161 nm, and cryo-electron microscopy confirms the presence of hydrated nanochannels. The results highlight the critical role of streaming potential in electricity generation, with the device achieving a threefold increase in voltage by reducing the pore size. The optimized device delivers an open-circuit voltage of 1.05 V and a short-circuit current of 100 µA with a 0.1 m NaCl droplet. Moreover,a practical application is demonstrated through a sweat-monitoring patch that visually responds to ion concentration changes. This work advances the design of high-efficiency hydrovoltaic systems by establishing a clear link between tunable nanoscale architecture and device performance, paving the way for scalable energy harvesting and sensing technologies.
研究领域:
生物材料学
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纳米能源
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仿生工程
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生物传感器
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分子流体力学
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可穿戴设备
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
·
IF 2.829
Botao Song,Qing Xu
Using filtration materials possessing superhydrophilic-underwater superoleophobic property to separate oil/water mixtures has become a research hotspot. However, most of the works are concentrated on building filtration materials with special wettability , ignoring the pore structures . Herein, polydopamine-modified (PDA-modified) nanofibrous mats with tunable pore sizes and special wettability were prepared by combining the electrospinning technique with a very simple modification process for oil/water separation. The results indicated that the pore structure of the PDA-modified nanofibrous mats could be finely modulated by utilizing different kinds of stainless steel wire meshes as collectors, and more interesting was that all the modified nanofibrous mats showed superhydrophilicity-underwater superoleophobicity. For the oil/water separation, the PDA-modified nanofibrous mats displayed high efficiency and high flux in separating oil/water mixtures, and the water flux could be highly improved by controlling the pore size and the optimal flux was high up to 40,405 L m −2 h −1 . In addition, the PDA-modified nanofibrous mats exhibited excellent durability and recyclability. Finally, as a proof of concept a novel oil collection device based on the PDA-modified nanofibrous mat was constructed to in situ separate the oil/water mixtures and collect the oil simultaneously. The developed PDA-modified nanofibrous mats would have wide applications in oily wastewater separation and purification.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 12
·2062
·
IF 5.719
Wenlei Zhang,Hongwei Yin,Zhichao Yu,Xiaoxia Jia,Jianguo Liang,Gang Li,Yan Li,Kaiying Wang
Metal-organic frameworks (MOFs) have attracted significant research interest for supercapacitor applications due to their high-tunable conductivity and their structure’s pore size. In this work, we report a facile one-step hydrothermal method to synthesize nickel-based metal-organic frameworks (MOF) using organic linker 4,4′-biphenyl dicarboxylic acid (BPDC) for high-performance supercapacitors. The pore size of the Ni-BPDC-MOF nanostructure is tuned through different synthesization temperatures. Among them, the sample synthesized at 180 °C exhibits a nanoplate morphology with a specific surface area of 311.99 m2·g−1, a pore size distribution of 1–40 nm and an average diameter of ~29.2 nm. A high specific capacitance of 488 F·g−1has been obtained at a current density of 1.0 A·g−1in a 3 M KOH aqueous electrolyte. The electrode shows reliable cycling stability, with 85% retention after 2000 cycles. The hydrothermal process Ni-BPDC-MOF may provide a simple and efficient method to synthesize high-performance hybrid MOF composites for future electrochemical energy storage applications.Keywords:metal organic framework;4,4′-biphenyl dicarboxylic acid;one-step hydrothermal method;tunable pore size;nanoplate structure;supercapacitors
研究领域:
材料科学
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能源存储
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DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Xintong Zhou,Chang-jun Liu
Structured porous carbon materials have been extensively applied for catalyst, sensor, adsorbent, energy storage materials and many others. However, the preparation of such carbon materials in a controllable way remains a significant challenge. In this work, 3D printing has been employed to prepare porous carbon structures with tailorable pore sizes. A starch/gelatin ink has been applied as carbon source with SiO 2 monodispersed spheres as hard template. The process exhibits an excellent printing accuracy. Controllable meso and macro structures can be thereby obtained. The printed monolithic structures have been used as metal-free catalysts for the selective oxidation of benzyl alcohol, as an illustration. The monolithic and meso/macro-porous structure has a remarkable influence on the reaction rate. A high conversion with high benzaldehyde selectivity has been achieved. The 3D printing strategy provides us a simple, low cost and reliable way of fabricating carbon structures with designable meso/macro-pores, which is promising for many other applications beyond catalysis.
研究领域:
材料科学
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催化化学
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能源材料
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纳米结构材料
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功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yuanyuan Liu,Zhilin Tian,Liya Zheng,Bin Li
Porous silica ceramics were prepared by a freeze-casting method using dual solvents as a template, and their microstructure can be regulated by different ratios of solvents. As the camphene content increases, the pore shape gradually changes from prismatic pores to spherical pores, and the pore size first decreases and then increases. A porous silica ceramic showed 76 % porosity and a uniform pore size of 6 µm. It presents excellent thermal insulation properties (thermal conductivity ∼0.17 W m −1 K −1 ), good compressive strength , and a stable dielectric constant (∼1.48). The results of this work shed light on the promising aerospace application of porous ceramics prepared by freeze-casting using dual solvents as a template.
研究领域:
材料科学
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陶瓷
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航空航天工程
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产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Dingshan Liang,Chuanxin Zhong,Feilong Jiang,Junchen Liao,Haixia Ye,Fuzeng Ren
Porous tantalum (Ta) is a potential bone substitute due to its excellent biocompatibility and desirable mechanical properties. In this work, a series of porous Ta materials with interconnected micropores and varying pore sizes from 23 to 210 μm were fabricated using spark plasma sintering. The porous structure was formed by thermal decomposition of ammonium bicarbonate powder premixed in the Ta powder. The pore size and porosity were controlled by the categorized particle size of ammonium bicarbonate. The porous Ta has elastic moduli in the range of 2.1–3.2 GPa and compressive yield strength in the range of 23–34 MPa, which are close to those of human bone. In vitro, as-fabricated porous Ta demonstrates excellent biocompatibility by supporting adhesion and proliferation of preosteoblasts. In vivo studies also validate its bone repair capability after implantation in a rat femur defect model. The study demonstrates a facile strategy to fabricate porous Ta with controllable pore size for bone repair.
研究领域:
材料科学
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生物医学工程
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生物材料
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Lei Shi,Fan Xiang,Kexin Liu,Wulong Li,Zhanxiong Li
Metal-organic frameworks (MOFs) show great potential applications in dealing with heavy metal pollution due to their unique large specific surface area, tunable pore size, and diverse active groups. However, the powder form of MOFs has suffered from the disadvantages of difficult recycling and secondary contamination after adsorption of heavy metals, which seriously limits their practical application. Therefore, in this work, we prepared a series of bifunctional zirconium-based MOFs cotton fabric composites (MCFC) via in situ growth of MOFs on carboxylated cotton fabric, exhibiting large specific surface area, adjustable pore size, and effective adsorption ability. The prepared CF-UiO-66-(OH) 2 -FA shows an excellent adsorption efficiency of Au(III) more than 99.990 %, and the saturated adsorption amount is up to 190.98 mg·g −1 at 25 °C. Meanwhile, the kinetic experiment analysis demonstrated that the Au(III) adsorption behavior of MCFC follows pseudo-second-order (PSO) kinetic model. More importantly, it also exhibits great selectivity in adsorbing Au(III) from the mixture of multiple metal ions coexisted solution. The results of adsorption thermodynamics and adsorption isotherms indicate that adsorption is monolayer and a spontaneous, exothermic process. And the ideal adsorption and separation process could be finished by quickly filtrating with a single or multi-layer MCFC. Excellent adsorption performance even after four cycles of adsorption. Therefore, the fabricated MCFC shows great processability, flexibility, collectability and reusability in adsorbing and recycling precious metal ion from wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
·
废水处理
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）