JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 1
·1194-1201
·
IF 1.338
Wang Yun,Guo Yuan,Shen Yuanyuan,Chen Rongjun,Wang Feihu,Zhou Dejian,Zhou Dejian
Traditionally, gold nanorods (GNRs) are mostly prepared via a seed-mediated growth approach, which usually produce an initial burst growth followed by slower kinetics and generate dogboneshaped GNRs with relatively small aspect ratios (ARs). We demonstrate here that the growth of GNRs
can be effectively retarded by addition of hydrochloric acid (HCl), leading to the formation of symmetric, long GNRs with high ARs. Furthermore, time-dependent kinetic analysis of GNR growth reveals two completely different growth modalities: in the absence of HCl, the GNR growth is rapid,
reaching a concentration of 0.64 nM in 10 min. Its AR also rapidly reaches a maximum value of 4.1 at 2 min and then gradually decreases to 3.3 over 5 h. In sharp contrast, in the presence of HCl additive, the GNR growth happens very slowly, reaching a concentration of 0.33 nM at 7 h, and the
AR also grows slowly to reach a maximum value of 5.3 at 3 h. These growth modalities endow different formation mechanisms of GNRs, which determine their aspect ratios and shape.
研究领域:
纳米生物学
·
材料科学
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DOI
PubMed
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Zhihui Chen,Hua-Neng Xu,Xiao-Kun Ouyang
We develop a route to prepare two types of cellulose nanocrystals (CNCs, CNC1 and CNC2) from a unique biomass resource, the fruit shell of Camellia oleifera Abel (SCOA), by integrating sulfuric acid hydrolysis and high-pressure homogenization and examine the effects of hydrolysis time on characteristics of the CNCs during the process. The CNCs exhibit different evolutions in size, morphology, surface charge, and crystallinity with increasing hydrolysis time. While both the CNCs have high crystallinity, CNC1 is of rod-like character with a relatively low aspect ratio, and CNC2 exhibits a hairy appearance with a high aspect ratio. We highlight that controlled acid hydrolysis contributes to the formation of weak spots with an increased susceptibility for homogenizing cellulosic solid residues into hairy CNCs. This is a good step toward tailoring CNC properties in a conventional and scalable approach to maximize their potential applications.
研究领域:
材料科学
·
生物化学
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产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 33
·334001
·
IF 3.404
Hao Huang,Huiyi Li,Huaiyu Wang,Jia Li,Penghui Li,Qidan Chen,Yue Chen,Paul K Chu,Bo Li,Xue-Feng Yu
We report a modified synthesis route of colloidal gold nanorods (AuNRs) by combining the thermal re-shaping treatment and bi-surfactant modification using hexadecyltrimethylammonium bromide (CTAB) and sodium oleate (NaOL). Aspect ratios down to 1.3 ± 0.1 can be achieved in addition to good monodispersity, uniformity, and chemical stability of the materials. Furthermore, without needing post-treatment, metal ions directly interact with the AuNRs efficiently, allowing rapid and sensitive colorimetric detection of heavy metal ions such as Pb2+ and Cu2+ with a low concentration down to 2.5 μM. The detection performance in terms of selectivity, sensitivity and stability is systematically evaluated. The AuNRs with tunable aspect ratios as well as chemical stability have potential in surface-plasmon-based applications such as biochemical sensing, biochemical imaging, medical diagnostics, and cancer therapy.
研究领域:
材料科学
·
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
SN Applied Sciences
·
2019
·Vol. 1
·期 12
·1-11
·
IF 0
Liu Duo,Liu Jie,Lin Song,Wei Xiaohui,Guo Min-jie
Two cellulose nanocrystals (CNCs) with different aspect ratios in dimension derived from raw microcrystalline cellulose were prepared and presented in this paper. The morphological features of nanostructures were explored with TEM. Then the structure analysis, surface charge and thermal degradation behavior of CNCs were characterized and determined by FTIR/X-ray diffraction, zeta potential and TGA, respectively. Furthermore, the hybrid CNCs nano-composite membranes were facilely fabricated via vacuum-dewatered process for effective removal of cationic dyes (up to 99.9% removal of methylene blue at 10 mg/L and 97.9% removal of rhodamine B at 20 mg/L). The mechanism of such effective cationic dye removal is derived from the combined effect of both electrostatic interaction and steric hindrance between the CNC composite membrane and the cationic dyes during the filtration process. In addition, the permeation flux and dye removal efficacy of the composite membrane are CNCs loading-concentration dependent.
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
CRYSTENGCOMM
·
2013
·Vol. 15
·期 44
·8907-8911
·
IF 3.879
Wang Lin,Chengming Li,Fengmei Gao,Jinju Zheng,Guodong Wei,Weiyou Yang
The synthesis of hollow nanostructures has attracted great attention in nanotechnology. As compared to the long hollow structures, the short counterparts could serve other compelling applications, and have become a hotspot in the field of nanomedicine. In the present work, a novel brand graphite-based nanostructure with a special cup-shaped feature was synthesized via the pyrolysis of a solid carbon source of polymethylmethacrylate (PMMA). These nanocups are typically characterized with open ends, tapered hollow cavities and slowly convergent roots, which are free standing on the graphene films with very low length/diameter aspect ratios as compared to conventional carbon nanotubes. The growth mechanism of these cups was proposed. It is promising that the present graphite nanocups could have potential applications in drug delivery.
研究领域:
纳米技术
·
纳米医学
·
材料科学
·
碳纳米结构
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DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Yu Zhou,Ying Liang,Bin Fang,Shuanglong Yuan,Zhen Zhang
Copper materials with nanoplate structure combine the advantages of nano and micrometer dimensions, featuring excellent electrical conductivity, low-temperature sintering performance, and processability. They have considerable applicability and greater economic benefits compared with silver, and thus have attracted much attention in the field of microelectronic packaging. In this study, a seed-mediated growth method was proposed to synthesize copper nanoplates (Cu NPs) under mild conditions. By selecting pre-synthesized silver nanoplates as seeds, the synthetic efficiency and dimensional controllability of Cu NPs have been greatly improved. At 40 °C, Cu NPs with good dispersion can be obtained within 15 min. The formation mechanism of Cu NPs was proposed by studying the factors that influence it. The conductive adhesives formulated with as-synthesized Cu NPs achieve an impressively low resistivity of 35 μΩ cm at a filler content of 90 wt%, paving the way for the industrial application of copper-based conductive adhesives.
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xueyang Liu,Zengkai Huang,Hua Ma,Jingxian Wang,Shiwen Yang,Yingbin Jia,Qingquan Tang,Luoxin Wang,Hua Wang,Siwei Xiong
As a building block unit, the thermotropic liquid-crystal polyarylate (PAR) nanofibers are expected to offer a more diverse and efficient processing model compared to that of the lyotropic liquid-crystal polymer nanofibers through their thermoplastic process. However, there is currently a lack of literature documenting the preparation method of PAR nanofibers. In this study, we successfully fabricated representative thermotropic liquid-crystal polymer nanofibers, namely, PAR nanofibers, employing a wet ball-milling technique. By investigating the aggregated state structure, microscopic morphology, and surface energy of PAR under different treatment conditions, we elucidated the underlying mechanisms governing the generation and dispersion of PAR nanofibers. The prepared PAR fibers could reach 155.2 nm in diameter and exhibited a notable aspect ratio; the observed lengths of these fibers exceeded 15 μm, with aspect ratios surpassing 96.7. Prior to reaching a temperature of 400 °C in a nitrogen atmosphere, the PAR nanofibers did not display significant weight loss, indicating excellent thermal stability. Furthermore, the PAR nanofiber membranes displayed exceptional mechanical properties, with a tensile strength reaching 139.1 MPa.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
RARE METALS
·
2026
·Vol. 45
·期 5
·e70339
·
IF 12.1
Linxuan Wu,Junjie Hao,Yining Shao,Yunxiang Zhang,Tianqi Li,Shoule Wang,Yuanting Huang,Jiaji Cheng,Yu Shi,Xiaoqian Xu
en This link goes to a English section zh This link goes to a Chinese section Chiral CdSe/CdS quantum dots (QDs) have emerged as promising platforms for precise cancer diagnosis and therapy due to their unique optical properties and biological interactions. In this study, we systematically investigated the role of aspect ratio (AR) modulation in ultrathin-shelled chiral CdSe/CdS dot-in-rods (DRs) on their performance in fluorescence imaging (FLI) and photodynamic therapy (PDT) against breast cancer. Four groups of chiral CdSe/CdS DRs (D/L-DRs) with comparable core sizes and shell thicknesses but distinct ARs were synthesized and characterized. Surface modification with chiral cysteine not only ensured the biocompatibility of D/L-DRs but also conferred enhanced chiroptical activity. Notably, D/L-DR-1, featuring the smallest AR, not only exhibited excellent reactive oxygen species (ROS) production efficiency upon circularly polarized light (CPL) irradiation but also achieved the most efficient FLI performance. Among them, D-enantiomer modified CdSe/CdS DRs showed higher imaging brightness both in vitro and in vivo. Mechanistically, CPL-triggered ROS production by D/L-DRs could activate autophagy, leading to autophagy-dependent tumor cell death. In vivo experiments also confirmed that D-DR-1 mediated PDT achieved complete tumor ablation in 80% of treated mice. This study establishes a clear structure-activity relationship between AR of QDs and functional performance, further highlighting the dual contribution of physical geometry and chirality in enabling selective and effective tumor theranostics. These insights offer new design principles for next-generation chiral nanomaterials with optimized optical, biological, and therapeutic functionalities. 摘要 en This link goes to a English section zh This link goes to a Chinese section 手性CdSe/CdS量子点 ( QDs ) 因具有光致发光及光催化活性 , 在肿瘤荧光成像 ( FLI ) 与光动力治疗 ( PDT ) 中具有广阔应用前景。然而 , QDs几何参数 , 特别是长径比 ( AR ) 与其诊疗性能的构效关系尚未得到系统研究。本研究通过手性半胱氨酸 ( D-/L-Cys ) 修饰 , 制备了多种具有超薄壳层手性CdSe/CdS核壳点-棒纳米结构 ( DRs ) , 系统探讨了调控AR对其在乳腺癌细胞中FLI及PDT性能的影响。本研究构建并表征了四组核心尺寸与壳层厚度相近、但AR各异的 ( AR: 3.2, 4.6, 6.7, 14.3 ) D-/L-构型CdSe/CdS DRs ( D/L-DRs ) , 并在乳腺癌细胞系及荷瘤小鼠模型中系统评估其成像与治疗效果。研究结果证明 , D-/L-Cys修饰显著提升了CdSe/CdS DRs的生物相容性 , 并增强了PDT效果。AR的变化可调控D/L-DRs的FLI性能 ( Ex : 561 nm ; Em : 570–620 nm ) 和圆偏振光 ( CPL ) 激发的活性氧 ( ROS ) 产率 : 具有较小AR的D/L-DRs 在肿瘤细胞内表现出更强的荧光信号和更高的单位AR下的ROS 产率 , 显示出更优的诊疗性能。此外 , D-Cys修饰的CdSe/CdS-DRs在体内外的成像亮度显著高于L-构型 , 提示手性特性影响纳米材料更易于被肿瘤细胞摄入。473 nm CPL激发下 , 由D/L-DRs介导的PDT可通过ROS激活肿瘤细胞自噬 , 导致自噬依赖性的细胞死亡实现肿瘤治疗。综上 , 本研究阐明了QDs的AR与其诊疗性能间的构效关系 , 证实了物理几何结构与手性修饰在实现肿瘤诊疗中的协同作用 , 为设计开发下一代兼具优异光学、生物学及治疗功能的手性纳米材料提供了新的依据。
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Zhengxia Xu,Yuhong Kan,Changqing Liu
Anatase TiO 2 nanoparticles with tuning size and aspect ratio were successfully prepared by a simple solvothermal method, using ethanol as a solvent, titanium butoxide as a precursor, and oleic acid and oleylamine as anionic and cationic capping agents, respectively. The average size and aspect ratio of these nanoparticles can be greatly regulated by varying the oleic acid/oleylamine molar ratio while keeping their total molar content constant and finely adjusted by increasing the total capping agents molar concentration in solvent at constant molar ratio (oleic acid/oleylamine molar ratio = 1:1). The variation of molar ratio or molar concentration enables a manipulation of the growth rate along different facets of TiO 2 nanoparticles and, consequently, a control of the aspect ratio of these nanoparticles. Moreover, the photocatalytic degradation rate of methyl blue for sample prepared with molar ratio of oleic acid to oleylamine at 6:24 is over 11% higher than that for the other samples.
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
International Journal of Applied Ceramic Technology
·
2026
·Vol. 23
·期 3
·e70213
·
IF 2.6
Zhan Zhang,Boran Wang,Ze Wu,Yu Chen,Jiachen Liu,Liwen Yan,Anran Guo
Porous calcium silicate (CaSiO 3 ) ceramics, composed mainly of CaSiO 3 whiskers, are widely used as high-temperature thermal insulation materials due to their high porosity and stability. However, CaSiO 3 whiskers prepared by the dynamic hydrothermal method have defects of low aspect ratio and poor uniformity. To solve these problems, high-aspect-ratio and uniformly distributed CaSiO 3 whiskers were successfully prepared by a two-step “coprecipitation-hydrothermal” method using CaCl 2 and CaO as composite calcium sources and Na 2 SiO 3 as the silicon source. Then porous CaSiO 3 ceramics (TS-CS) were fabricated using these whiskers as the starting materials via gel-casting, and their properties were compared with those prepared by the direct-hydrothermal method (DH-CS). Results show that the addition of CaO regulates the phase transformation process of CaSiO 3 , enabling the powders to form long whiskers with a high aspect ratio. In addition, the TS-CS ceramics have better performance. Results show that the sample sintered at 900°C exhibited a high porosity (90%), low density (0.26 g·cm −3 ), and low thermal conductivity (0.067 W·m −1 ·K −1 ). This work provides a new synthetic route for high-aspect-ratio CaSiO 3 whiskers, which is beneficial to improving the properties of porous CaSiO 3 ceramics.
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DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2018
·
IF 0
Tian Rui Chen,Hai Feng Wang,Hui Yang,Xing Zhong Guo
Silver nanowires with controllable and high length-diameter ratio were prepared by using the reductibility of ethylene glycol under high temperature and selective adsorption of PVP. AgNO3, ethylene glycol, PVP and CuCl2 was used as the silver source, the reductant, the capping agent and the ion additives, respectively. The effects of centrifugal rate, silver ions' concentration, AgNO3 adding rate on the morphology of silver nanowires were investigated by SEM, XRD, TEM and other technologies. The results show that the optimal centrifugal rate is 2000n/s, the better silver ions’ concentration is 6.55 mg/mL, and the best rate of adding AgNO3 is 6 ml/min. The silver nanowires with an average diameter of 74.9 nm, the average length of 45.5μm and its length-diameter ratio of 607.5 are obtained. The silver nanowires with good morphology and high length-diameter ratio are adjustable, which is suitable for the preparation of OLED transparent film electrode materials, and other conductive materials.
研究领域:
纳米材料
·
材料科学
·
纳米技术
·
透明导电薄膜
✓ 已验证
DOI
Advanced Theory and Simulations
·
2018
·Vol. 1
·期 4
·1700034
·
IF 0
Shaofei Shen,Lisha Kou,Xuan Zhang,Defu Wang,Yanbing Niu,Jinyi Wang
The ability to control the movement of fluids is significant in biological analysis, chemical synthesis, and medical diagnostics. Microfluidic technologies have achieved promising progresses in fluid manipulation by curvilinear channel geometries due to the presence of secondary flows. However, most of these devices are not designed in low aspect ratio microchannels because of the difficulty of weak Dean effect. Herein, we describe an inertial microfluidic system that allows deterministic regulation of secondary flows by geometric confinement in ultra-low aspect ratio microchannels. On the introduction of a series of micro-obstacles in semicircular microchannels, the resulting acceleration of secondary flow can be applied to remarkably potentiate many molecular interactions and reactions with a high mixing efficiency and speed under a wide range of flow capacity. The strategy to engineer secondary flow used in this work offers new insights pointing to low aspect ratio, ease-to-use, high-throughput, and considerable flexibility for designing efficient microfluidic devices in diverse fluid manipulations.
研究领域:
微流控技术
·
生物分析
·
化学工程
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产品关联
DOI
危险品化学品经营许可证（带存储）