INDUSTRIAL CROPS AND PRODUCTS
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2023
·
IF 5.9
Gaopan Dong,Zhengqiu Yuan,Xiujuan Guo
Petroleum-based plastics are widely used because of their practicable properties and low cost. However, people are equally concerned about the environmental damage generated by non-biodegradable petrochemical plastics. In this study, pinewood was employed as the raw material to prepare cellulose acetate and further synthesize the degradable composite films, which showed potential feasibilities to substitute the traditional petroleum-based plastics. In order to improve the barrier performance, hydrophobic performance, and mechanical properties of the film materials , nano-SiO 2 was introduced as functional filler for experimental exploration. The tensile strength, light transmittance, water vapor transmittance, microstructure, and crystalline structure of the nano-SiO 2 /pinewood-derived cellulose acetate composite films were determined by mechanical analysis, optical analysis, SEM, XRD , FT-IR, and barrier characterization methods, respectively. The results exhibited that the prepared films with the inclusion of nano-SiO 2 did not conduct reduction in transparency due to its good dispersion in the composite film. The barrier property, hydrophobic performance, and mechanical properties of cellulose acetate composite film were effectively improved due to the interaction between nano-SiO 2 and cellulose acetate molecular chains by the hydrogen bonds formed between hydroxyl groups. It was confirmed that the nano-SiO 2 /pinewood-derived cellulose acetate composite films exhibit great application potential as an environmentally friendly and efficient material for packaging.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
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2014
·Vol. 4
·期 88
·47781-47787
·
IF 3.708
Man Wang,Xuefeng Xu,Bing Ma,Yanyan Pei,Changchun Ai,Liangjie Yuan
Here we present a cheap alternative for the fabrication of conductive line patterns printed on a flexible PI substrate at intermediate temperature. In order to achieve this purpose, a low-cost and water-soluble screen printing conductive paste was prepared, with micron-SiO2@nano-Ag particles as the conductive filler. Variations in the filling content of micron-SiO2@nano-Ag, the addition of the coupling agent, curing temperature and time can remarkably affect the electrical and mechanical performance of the conductive paste. The optimal sheet resistance (at 62 mΩ □−1) and mechanical performance of the paste were achieved under the curing conditions of 140 °C for 30 min, with the filling content of 53.6 wt% of micron-SiO2@nano-Ag (32.4 wt% of Ag) and 1.0 wt% of the coupling agent APTES. The conductive mechanism of the paste was discussed according to the “percolation theory”. The conductive line patterns fabricated through silk-screen printing were applied to be linked with a LED into a circuit, suggesting that the paste would have a potential application in electronic devices.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Yirui Shen,Pingping Jiang,Yingchun Wang,Gang Bian,Phyu Thin Wai,Yuming Dong
A general thermal decomposition strategy is reported to fabricate MoO 3 @SiO 2 nanoreactors , with a mesoporous silica shell and embedded MoO 3 nanoparticles . The novel preparation procedure involves mixing certain mass ratio of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O (AMM) and hollow mesoporous silica spheres (HMSS) by grinding, fusion and thermal decomposition of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O under calcination and removing the residual via filtration. The as-prepared MoO 3 @SiO 2 nanoreactors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), N 2 adsorption/desorption and X-ray photoelectron spectra (XPS). The nanoreactors were utilized in epoxidation of alkenes and displayed high catalytic activity and stability. The mass ratio of AMM and HMSS greatly affected the properties and catalytic performance of the nanoreactors. The optimal mass ratio of AMM: HMSS has been confirmed as 1/2. After reacting for 12 h with H 2 O 2 (50 wt%) as oxidant, conversion and selectivity of optimal MoO 3 @SiO 2 -400-1/2 almost reached up to 98% and 99%, respectively. Furthermore, the catalyst still had high conversion (78%) and selectivity (95%) at 4 h epoxidation of cyclooctene after recycling for 6 runs. Kinetics study was also carried out and demonstrated the epoxidation of alkenes follows the first order model.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 18
·2928-2933
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IF 2.942
Xianjun Tan,Liujia Lu,Lingzhi Wang,Jinlong Zhang
Graphical A bimodal mesoporous Fe 3 O 4 @SiO 2 composite was fabricated through a facile self-assembly route. Unprecedentedly good tunability of the core size (180–1700 nm) and the shell thickness (20–75 nm) has been achieved. The composite exhibits excellent performance in organic pollutant removal through adsorption and photo-Fenton degradation. A facile self-assembly synthetic procedure was exploited to fabricate mesoporous-silica-capped Fe 3 O 4 mesoporous clusters, so-called bimodal mesoporous Fe 3 O 4 @SiO 2 composites. Structural characterization demonstrated that the core of the Fe 3 O 4 clusters is coated with a mesoporous silica shell of uniform size distribution. Moreover, unprecedentedly good tunability of the core size (180–1700 nm) and the shell thickness (20–75 nm) is achievable by changing the synthetic parameters. Application of the composite in the removal of the organic dye methylene blue (MB) from aqueous solution was examined. The composite exhibits excellent adsorption of methylene blue from aqueous solution (33.12 mg g –1 ) within 5 min and is easily regenerated by the photo-Fenton degradation reaction as a result of its high specific surface area, accessible pore channels, and good magnetic separation properties. This novel adsorbent promises extensive application in the practical removal of organic dyes.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 14
·2923-2928
·
IF 1.915
Xiaohua Li,Yun feng Bai,Feng Feng,Zhujun Zhang
Herein, we present a novel chemiluminescent (CL) sensor combined with an enzyme immobilization technique. We propose a versatile approach for the fabrication of CL sensors based on hydrophilic Co3O4@SiO2 mesoporous nanoparticles. The Co3O4@SiO2 mesoporous nanoparticles immobilized on the 96-well plates exhibited higher catalytic activity on the luminol–H2O2 CL reaction in an alkaline medium. Enzyme reactors were fabricated by incorporating functionalized mesoporous silica particles into calcium alginate fiber (CAF) to efficiently encapsulate the enzyme. The novel CL sensors combined with the enzyme reactors were reversible and reusable, which have been successfully exploited towards the high-throughput determination of glucose in human serum. The method was based on the generation of H2O2 from glucose in human serum by immobilized glucose oxidase (GOD). The linear range of the glucose concentration was 1.0 × 10−6 to 8.0 × 10−5 M and the detection limit was 1.2 × 10−7 M.
研究领域:
分析化学
·
生物医学工程
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材料科学
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产品关联
DOI
高影响因子
Results in Physics
·
2020
·
IF 4.019
Yuan Zhao,Xiaoliang Liu,Guangdi Feng,Lu Lyu,Lin Li,Shitan Wang,Jie Jiang,Youzhen Li,Dongmei Niu,Haipeng Xie,Yongli Gao
The modification of C 60 nano-interlayers on the organic field-effect transistors (OFETs) based on 2,7-diocty[1]benzothieno-[3,2-b]benzothiophene (C8-BTBT)/SiO 2 was addressed at both the electronic structure and device level. It is observed that a band bending occurs in C8-BTBT layer with the insertion of C 60 , which induces a strong hole accumulation at the interface region, facilitating the formation of high concentration conducting channel when the interface is incorporated into OFETs. The strong acceptor C 60 may cause charge transfer from the trap states in C8-BTBT, resulting in a field-effect operation with decreased threshold voltage. However, the increasing disorder in C8-BTBT induced by the C 60 nano-interlayer may reduce the hole mobility at the C8-BTBT/SiO 2 interface region and change the growth model of C8-BTBT. In addition, as confirmed by the transfer characteristic of the OFETs, the thin C 60 insertion layer isn’t continuous enough to induce an ambipolar transport behavior despite its high mobility. The competition between the two opposite effects results in compromised performance in such OFETs. The device performance parameters deteriorate generally with increasing the C 60 nano-interlayer thickness. So, it is inferred that the C 60 interlayer alone cannot improve the performance of the C8-BTBT/SiO 2 -based OFETs without further optimization. Importantly, the device performance exhibits an abnormal improvement with a 6 nm C 60 interlayer, which might be ascribed to a higher energy level shift of C8-BTBT caused by a quasi-continuous C 60 film at this thickness.
研究领域:
材料科学
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电子工程
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纳米技术
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产品关联
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 4
·411
·
IF 2.654
Jing Zhao,Ming Zeng,Kaiqiang Zheng,Xinhua He,Minqiang Xie,Xiaoyi Fu
Thermoresponsive P(NIPAM-AA)/Fe3O4/SiO2microspheres with surface holes serving as carriers were prepared using p-Fe3O4/SiO2microspheres with a thermoresponsive copolymer. The p-Fe3O4/SiO2microspheres was obtained using a modified Pickering method and chemical etching. The surface pore size of p-Fe3O4/SiO2microspheres was in the range of 18.3 nm~37.2 nm and the cavity size was approximately 60 nm, which are suitable for loading and transporting biological macromolecules. P(NIPAM-AA) was synthesized inside and outside of the p-Fe3O4/SiO2microspheres via atom transfer radical polymerization of NIPAM, MBA and AA. The volume phase transition temperature (VPTT) of the specifically designed P(NIPAM-AA)/Fe3O4/SiO2microspheres was 42.5 °C. The saturation magnetization of P(NIPAM-AA)/Fe3O4/SiO2microspheres was 72.7 emu/g. The P(NIPAM-AA)/Fe3O4/SiO2microspheres were used as carriers to study the loading and release behavior of BSA. This microsphere system shows potential for the loading of proteins as a drug delivery platform.Keywords:P(NIPAM-AA);Fe3O4/SiO2hollow microspheres;holes;drug release
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Lingwei Li,Huan Wang,Jixiang Fang
Magnetic fluorescent nanomaterials have broad application prospects as taggants in fields such as anticounterfeiting identification, suspicious object tracking, and potential fingerprint recognition in forensic medicine. It is a common method to synthesize magnetic fluorescent composite nanoparticles by preparing a shell on the surface of magnetic particles to load fluorescent materials. In this work, a magnetic fluorescence nanohybrid was synthesized by in situ encapsulation of carbon quantum dots (CQDs) during the preparation of a SiO2 shell on the surface of Fe3O4 nanoparticles. The traditional Stöber method was employed to synthesize the SiO2 shell. Meanwhile, CQDs were introduced into the hydrolysis process of tetraethyl orthosilicate. To address the issue of charge repulsion between the negatively charged hydrolysis intermediate of tetraethyl orthosilicate and the negatively charged CQDs, poly(diallyldimethylammonium chloride) with positive charge was introduced in the synthesis process. The repulsive charges in the reaction system were balanced by poly(diallyldimethylammonium chloride), allowing for the successful encapsulation of CQDs in the SiO2 shell. The structure, morphology, and magnetic and fluorescence properties of the prepared Fe3O4@SiO2–CQDs were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, a vibrating sample magnetometer, and a fluorescence spectrophotometer. The Fe3O4@SiO2–CQDs exhibited excellent magnetic and fluorescence properties, making them suitable for fluorescence labeling on various substrates and showing great potential in labeling, tracing, and fluorescence sensors.
研究领域:
材料科学
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纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mengchuan Li,Tongsheng Zhang,Rensheng Li
The thermodynamic data of rare earth-containing systems are crucial for the development and application of permanent magnets, optoelectronic materials, high-temperature superconducting materials, and catalysts. In this study, the equilibrium phase compositions of the CaO-Ce 2 O 3 -SiO 2 -(5∼25 wt%) Al 2 O 3 system at 1873 K were investigated through high-temperature equilibrium experiments. The equilibrium phase compositions at 1873 K were determined using SEM, XRD, and EPMA, leading to the construction of isothermal sections. For the CaO-Ce 2 O 3 -SiO 2 -5 wt% Al 2 O 3 system, the isothermal cross-section diagram revealed a liquid phase region, four distinct two-phase equilibria, and two different three-phase equilibria. As the Al 2 O 3 content increased to 25 wt%, the isothermal cross-section diagram showed a liquid phase region, five different two-phase equilibria, and three distinct three-phase equilibria. The experimental results provide valuable insights for further research on the practical applications of cerium-containing rare earths in various fields.
研究领域:
材料科学
·
热力学
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产品关联
DOI
高影响因子
MOLECULES
·
2013
·Vol. 18
·期 11
·14258-14267
·
IF 2.428
Huan Liu,Chao Lin,Zhen Ma,Hongbo Yu,Shenghu Zhou
Fe3O4spheres with an average size of 273 nm were prepared in the presence of CTAB by a solvothermal method. The spheres were modified by a thin layer of SiO2, and then coated by mesoporous SiO2(m-SiO2) films, by using TEOS as a precursor and CTAB as a soft template. The resulting m-SiO2/Fe3O4spheres, with an average particle size of 320 nm, a high surface area (656 m2/g), and ordered nanopores (average pore size 2.5 nm), were loaded with gold nanoparticles (average size 3.3 nm). The presence of m-SiO2coating could stabilize gold nanoparticles against sintering at 500 °C. The material showed better performance than a conventional Au/SiO2catalyst in catalytic reduction ofp-nitrophenol with NaBH4. It can be separated from the reaction mixture by a magnet and be recycled without obvious loss of catalytic activity. Relevant characterization by XRD, TEM, N2adsorption-desorption, and magnetic measurements were conducted.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Building Engineering
·
2022
·
IF 7.144
Dan Wang,Junjie Li,Lina Zhang,Congcong Jiang,Ping Yang,Xin Cheng
In recent years, due to superior performance of nano-SiO 2 , it is widely studied and applied in cement-based materials to improve mechanical properties and durability of the matrix. Nano-SiO 2 could be a potential surface-treatment agent, however, the activity of nano-SiO 2 determines surface modification effect. In this work, in order to obtain high activity nano-SiO 2 , three samples, with different sizes, surface hydroxyl groups , and viscosities , were synthesized via a so-gel method by adjusting the experimental parameters such as water dosage and reaction temperature. Water absorption rate and chloride ion penetration experiments were carried out to investigate ion/water transmission property of cement-based materials after surface treatment using nano-SiO 2 . S-20 sample dropped the water absorption rates by 28.8% and chloride penetration depths by 57.5%. The pozzolanic reaction and accelerating C 3 S hydration process were carried out to evaluate the activity of obtained nano-SiO 2 . The above results indicate S-20 sample shows the highest activity. The preparation method of high-activity nano-SiO 2 is provided to significantly improve surface quality of the cement paste matrix.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 11
·1845
·
IF 3.4
Zhimin Cao,Mingyi Zhu,Xuxu Dong,De Liu,Pan Cao
An innovative antifouling composite coating comprising dopamine (DA), polyethyleneimine (PEI), and silica (SiO2) was developed through a straightforward and environmentally friendly approach. Initially, silica nanoparticles comodified with DA and PEI were meticulously deposited onto 304 stainless steel surfaces pretreated with dopamine to achieve a uniformly distributed nanocomposite surface. Comprehensive analytical techniques, including Fourier transform infrared spectrometry (FTIR), X-ray photoelectron spectrometry (XPS), field emission scanning electron microscopy (SEM), contact angle measurement (CA), and 3D optical profilometry, were employed to affirm the successful preparation of the silica nanocomposite coatings and the effective grafting of MAG II. The antibacterial and antibiofilm performance of the DA/PEI/SiO2-modified surface was rigorously assessed usingVibrio natriegens(V. natriegens), yielding compelling results indicating a substantial 51.4% reduction in biofilm formation on the SS-DA/PEI/SiO2sample surfaces, coupled with an impressive 95.2% decrease inV. natriegensadhesion. This pioneering research introduces an innovative strategy for the development of antimicrobial surfaces with promising applications in medical devices, aquaculture, and related fields.Keywords:surface modification;DA/PEI/SiO2nanocoating;antimicrobial performance;stability properties
研究领域:
材料科学
·
生物医学工程
·
表面化学
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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）