APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhixiang Ye,Li Lin,Ziyang Tan,Yu-Jia Zeng,Shuangchen Ruan,Jian Ye
Gap-enhanced Raman tags (GERTs) with built-in Raman molecules show excellent surface-enhanced Raman scattering (SERS) performance and great potential for biomedical applications. In this work, we add a silver (Ag) shell to gold (Au) single-shell GERTs (Au@BDT@Au) to form Au-Ag hybrid multi-shell nanoparticles . It is found that this modification enhances the SERS performance of the NPs and that the thickness of the Ag shell is a key factor in determining the enhancement. Double-shell bimetallic GERTs with a Au core, Au shell and exterior 2 nm-thickness silver shell (Au@BDT@Au@BDT@Ag) show the best SERS performance and good photostability. Moreover, we utilize the double-shell bimetallic GERTs to develop a new kind of SERS-based lateral flow immunoassay (LFIA), acheiving limit of detection as low as 0.7 mIU/mL (0.077 ng/mL). We demonstrated a simple way to fabricate sub-100 nm multi-shell bimetallic GERTs for use as SERS probes with strong Raman signals with potential for in vivo and in vitro application as bioimaging and biosensing probes.
研究领域:
生物医学工程
·
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH INNOVATIONS
·
2015
·
IF 0.83
J. Ding,Z. Huang,H. Luo,Y. Qin,M. Shi
A polymer matrix composite was prepared by incorporating microcrystalline muscovite fillers into a boron-modified phenolic resin. Thermogravimetric analyses indicated that microcrystalline muscovite significantly enhanced the thermal stability of boron-modified phenolic resin under air atmosphere. Then the composite was heated in a furnace. After heated, the homogeneous structure of the composite was converted into a layered structure with a ceramic shell on the surface. The layered structure was investigated by electron probe micro-analysis and energy dispersive spectroscopy. The elemental content and chemical binding state of the layered structure were investigated by X-ray photoelectron spectroscopy. On the surface, the reaction between SiO2 and Al2O3 occurred, thus microcrystalline muscovite fillers were transformed into mullite shell. The mullite shell could protect char from further oxidation at elevated temperatures. Therefore, a amount of reserved char could react with SiO2 to generate Si–C bond in the inner of the composite.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Wei Wei,Yu Zhao,Shichao Peng,Haoyang Zhang,Yipeng Bian,Hexing Li,Hui Li
In this paper, we develop a facile strategy for fabricating a yolk–shell structured catalytic system that consists of a core made of Ru supported on mesoporous carbon, which is encaged within a silica shell that has ordered radial mesochannels. A region-selective etching mechanism for the formation of the yolk–shell nanoarchitectures is proposed based on the stronger adsorption ability of the carbon core for etching agent than that of the silica shell for etching agent. By combining such material with amyloglucosidase, one-pot hydrolysis–hydrogenation of dextrin to sorbitol can be conducted, delivering enhanced efficiency and showing great promise for biomass conversion applications.
研究领域:
材料科学
·
生物化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Ying Ren,Hongguo Xie,Xiaocen Liu,Fan Yang,Weiting Yu,Xiaojun Ma
The goal of this work is to tune the formation and stability of the alginate-chitosan (AC) polyelectrolyte complexes (PECs) and microcapsules. Particularly, we explore the role of the conformation of chitosan on its interaction with alginate to understand the mechanism underpinning their interactions at the molecular level. Reducing the charge density by increasing pH will increase the compactness of chitosan, the values of the enthalpy (H) and stoichiometry (N) of binding between chitosan and alginate. Consequently, chitosan has advantage in being adsorbed on alginate beads to form microcapsules, including the binding rate and binding amount. Though the total heat release remain similar in the range of ionic strength , chitosan diffuses much easier into alginate hydrogels when in higher ionic strength. Increasing pH and ionic strength both help AC microcapsules to have higher stability. The results indicate that the formation and stability of AC microcapsules are related to the rigidity and conformations of chitosan molecules. After increasing acetylation degree (DA) of chitosan, the binding rate of chitosan and mechanical strength of AC microcapsules are both reduced. This work demonstrates the versatility and feasibility of tuning the formation and stability of polysaccharide microcapsules by physical factors and chitosan chemical structures.
研究领域:
生物材料学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2017
·
IF 4.421
Ruixi Bai,Yang Zhang,Zhigang Zhao,Qiuxia Liao,Peng Chen,Panpan Zhao,Wanghuan Guo,Fan Yang,Laichao Li
Rapid and highly selective magnetic core–shell adsorbents for Pb 2+ removal from simulated wastewater of rare-earth industry were prepared by synthesizing chitosan-coated Fe 3 O 4 (Fe@CS) beads and following chemical-grafting steps for the diglycolamic-acid group (DGA). The adsorbents had a highly selective ability for Pb 2+ toward other metal ions, which attributed to the superior infinity between the DGA and Pb 2+ . The maximum adsorption capacity of Pb 2+ was 70.57 mg/g. The R 2 of the pseudo-second order kinetics was 0.99857, which indicated the adsorption process was controlled by chemical reactions. Moreover, diglycolamic-acid functionalized Fe@CS (Fe@CS-DGA) beads separated from water within 9 s under magnetic fields.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2013
·
IF 4.387
Yaping Li,Li Qi,Ying Shen,Huimin Ma
The core@shell Fe 3 O 4 @Au nanoparticles (NPs) functionalized with exchangeable self-assembled monolayers have been developed for mode switching magnetic solid-phase extraction (MSPE) using high performance liquid chromatography with ultraviolet detection. The adsorbents were synthesized by chemical coprecipitation to prepare magnetic cores followed by sonolysis to produce gold shells. Functionalization of Fe 3 O 4 @Au NPs surface was realized through self-assembly of commercially available low molecular weight thiol-containing ligands using gold shells as intermediate platform and the dynamic nature of Au–S chemistry allowed substituent of one thiol-containing ligand with another simply by thiol exchange process. The resultant adsorbents were characterized by transmission electronic microscopy, Fourier transform infrared spectroscopy, elemental analysis, contact angle measurement, and vibrating sample magnetometry. To evaluate the versatile performance of the developed MSPE adsorbents, they were applied for normal-phase SPE followed by reversed-phase SPE. A few kinds of diphenols and polycyclic aromatic hydrocarbons (PAHs) were employed as model analytes, respectively. The predominant parameters affecting extraction efficiency were investigated and optimized. Under the optimum experimental conditions, wide dynamic linear range (6.25–1600 μg L −1 for diphenols and 1.56–100 μg L −1 for PAHs) with good linearity ( r 2 ≥ 0.989) and low detection limits (0.34–16.67 μg L −1 for diphenols and 0.26–0.52 μg L −1 for PAHs) were achieved. The advantage of the developed method is that the Fe 3 O 4 @Au NPs could be reutilized for preconcentrating diverse target analytes in different SPE modes sequentially simply through treatment with desired thiol-containing ligands.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Jiahao Duan,Yanan Hou,Xiaodong Qian,Congling Shi,Mei Wan,Hongqing Zhu,Houwang Wang
This study, grounded in sustainable development strategies, developed a shell-core flame retardant by coating ammonium polyphosphate (APP) with multiple layers of polyelectrolytes composed of chitosan (CS) and silicon dioxide (SiO 2 ) through electrostatic interactions. The entire preparation process did not involve any organic solvents. The resulting APP@CS@SiO 2 -nBL (where “BL” denotes a bilayer structure of CS and SiO 2 , and “n” indicates the number of bilayers, ranging from 1 to 4) significantly enhanced the flame-resistant property of thermoplastic polyurethane (TPU). The TPU composite encompassing 20 wt% APP@CS@SiO 2 -4BL exhibited excellent thermal stability, where the maximum thermal decomposition rate declined by 21 % and the char residue elevated to 33.37 wt%. Additionally, this composite demonstrated superior performance in heat suppression and smoke reduction: the peak heat release rate, total heat release, peak smoke production rate, and total smoke release decreased 65 %, 86 %, 84 %, and 91 %, respectively, versus pure TPU. These enhanced properties relied on the multiple synergistic effects among APP, CS, and SiO 2 .
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
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Zhicheng Cai,Jianfeng Lu,Ziqi Dong,Hong Wang,Qiang Li,Lin Lin,Chenghui Wang,Bin Zheng,Xiangzhao Mao,Changhu Xue
Chitin, a high-value biopolymer derived from crustacean shells, generally requires harsh chemical decolorization to achieve acceptable purity and appearance. Herein, we developed a green extraction method for chitin using atmospheric pressure plasma jet pretreatment combined with acid–base processing. Chinese mitten crab shells were subjected to different sequences and concentrations of hydrochloric acid (HCl) and sodium hydroxide (NaOH) treatments, with and without plasma pretreatment. Structural and physicochemical characterizations were performed via FTIR, SEM–EDS, AFM, XPS, NMR, XRD, TGA, and molecular weight analysis. The results indicated that when the acid–base concentrations were ≥2-M HCl and ≥1-M NaOH, plasma pretreatment (PJ–HN) enabled the release of high-purity chitin without the need for chemical decolorization. The chitin obtained exhibited comparable crystallinity (64.58 %), thermal stability (DTG max = 402.9 °C), and molecular weight (6.89 × 10 5 g/mol) to commercial chitin. Moreover, the PJ–HN samples retained high acetylation degrees and showed enhanced surface roughness, indicating improved functional potential. The antibacterial test confirmed that it possesses broad-spectrum antibacterial activity. The present study demonstrates that plasma-assisted extraction can serve as an eco-friendly and efficient alternative to conventional chemical methods in crustacean chitin processing.
研究领域:
生物高分子
·
绿色化学
·
材料科学
·
生物技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Xiaoqian Li,Shenyong Ren,Lu Liu,Chi Yang
A core-shell structured USY-xTT@NiMo catalyst was prepared through thermal treatment method and evaluated for the catalytic hydrodesulfurization (HDS) performance toward dibenzothiophene (DBT). The shell assembled from NiMoS nano-wool provided abundant active site. This nano-wool morphology and core-shell structure resulted in the catalyst with enhanced specific surface area, pore volume, lower interaction between the support and active metals, and facilitated metal dispersion. In addition, the nano-wool morphology and core-shell structure also promoted the degree of sulfurization and provided more sulfur vacancies, which enhanced the HDS performance of the corresponding catalysts. An efficient USY-16TT@NiMo catalyst with shorter slab lengths (average 2.50 nm), higher average stacking number (3.37 layers), and more edge active sites was assembled, which showed superior k HDS value of DBT up to 8.29 × 10 −4 mol g −1 h −1 and high direct desulfurization selectivity to be 88 %.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2024
·
IF 3.4
Yang Zhang,Qizhuang Zou,Ruiqi Fang,Hua Tan,Hongbing Ji,Yingwei Li
Yolk-shell nanoreactors feature numbers of advantages in promoting catalytic performance. This work demonstrates the fabrication of yolk-shell Fe 3 O 4 @SiO 2 /Al 2 O 3 - T ( T = 500–900 °C) from metal-organic framework. Characterizations indicate the Fe 3 O 4 yolk and SiO 2 /Al 2 O 3 shell of the obtained nanoreactors. Fe 3 O 4 @SiO 2 /Al 2 O 3 –800 showed excellent performance in furfural acetalization to 2-(dimethoxymethyl)furan, achieving a 97% yield at 60 °C, atmospheric pressure within 5 h. Control experiments reveal the high reactivity of Fe 3 O 4 yolks for furfural acetalization, and acidic Al species are favorable for reactivity promotion. Besides, porous SiO 2 /Al 2 O 3 shells facilitate mass transfer and increase the accessibility of active sites, also contribute to the high performance and stability.
研究领域:
化学工程
·
纳米材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 3
·1-10
·
IF 2.184
Zhang Ya-Fang,Wang Jia-Hong,Ma Liang,Nan Fan,Cheng Zi-Qiang,Zhou Li,Wang Qu-Quan
Silver-coated gold nanoshells with 1,4-BDT molecules as the spacer (Ag/BDT/Au) were synthesized on the surface of SiO 2 nanospheres. The surface plasmon resonance of Au/SiO 2 and Ag/BDT/Au/SiO 2 nanoparticles with single and double shells were tuned by adjusting the thickness of Au and Ag nanoshells. The enhanced local field in the gap of Au and Ag shells is demonstrated by measuring Raman scattering and nonlinear refraction. The results show that the Raman intensity is enhanced by 17 times and the nonlinear refractive index is enhanced by 30 % due to the growth of Ag shells.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 86
·83321-83327
·
IF 3.289
Zhangyu Huang,Huiping Gao,Yanli Mao
In this study, the energy transfer (ET) mechanism among Yb3+/Er3+/Mn2+ has been revealed by download conversion (DC) and upconversion (UC) transients and steady-state fluorescence spectra. Moreover, the novel structure, inert-core/active-shell/inert-shell cubic NaYF4@NaYF4:Er3+/Yb3+/Mn2+@NaYF4, has been synthesized via a convenient hydrothermal method. With the excitation of a 980 nm laser diode, bright single-red upconversion (UC) fluorescence is observed, which shows the longest UC lifetime and highest efficiency compared with the other structures of NaYF4:Er3+/Yb3+/Mn2+, NaYF4:Er3+/Yb3+/Mn2+@NaYF4, and NaYF4@NaYF4:Er3+/Yb3+/Mn2+. The inert-core/active-shell/inert-shell nanocubes are homogeneous with an ultra-small (sub-20 nm) size, which is suitable for distribution and elimination in biological tissue. Our results indicate that the Mn2+ doping of δ-doped structures is an effective method to significantly improve UC single-red light, which shows great potential application in vivo bioimaging.
研究领域:
材料科学
·
生物成像
·
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）