POLYMER ENGINEERING AND SCIENCE
·
2023
·Vol. 63
·期 2
·489-498
·
IF 3.2
Wenting Xu,Qianqian Gu,Fanghua Zhu,Qiang Chen,Yiyang Liu,Jie Li,Meifang Liu,Yong Yi
Polymer microspheres can be used as fuel containers for laser inertial confinement fusion (ICF) due to their low atomic number, low density, and high thermal stability. The thin-walled polymer microspheres are prone to cracking due to an increase in the diameter to thickness ratio (diameter/wall thickness). The effect of polystyrene (PS) and Poly (α-methyl styrene) (PAMS) materials commonly used in ICF experiments on the quality of thin-walled microspheres is investigated. PS hollow microspheres show better sphericity, smoother surface, and lower cracking rate than PAMS microspheres. Moreover, the heat treatment of solidified PS microspheres can improve the strength so that the cracking rate of the microspheres decreases. The relative mechanism of how the molecular structure affect the quality is also discussed. This study provides some guidance for the preparation of thin-walled polymer microspheres with high quality for ICF experiments.
研究领域:
材料科学
·
核物理学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 95
·77860-77865
·
IF 3.84
Bing Yu,Feng Zhai,Hailin Cong,Dong Wang,Qiaohong Peng,Shijing Yang,Ruixia Yang
Polymerization while swelling, a promising and high-efficiency technique based on seeded polymerization, was applied to synthesize monodisperse polystyrene (PS) microspheres with an average diameter of ∼6 μm. The polymerization time was reduced to only 22 hours compared to the traditional way of about 3 days. Taking the synthesized PS particles as templates, conductive shells were prepared by chemically plating nickel on the particle surface. Moreover, an anisotropic conductive film (ACF) was produced using conductive nickel microspheres as electricity transmission media. After removing the PS templates, the obtained magnetic nickel hollow microspheres have a potential application in rapid waste removal and detoxification extraction with a very simple procedure.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Bioactive Materials
·
2025
·
IF 20.3
Jiannan Mao,Yichang Xu,Wenbo Wang,Xiongwei Deng,Yujian Hui,Min Rui,Jincheng Tang,Wei Wang,Yiyang Huang,Liang Wu,Kun Xi,Yunrong Zhu,Yong Gu,Liang Chen
Microspheres (MPs) and porous microspheres (PMPs) are the two most widely used microparticles in tissue engineering and stem cell therapy. However, how stem cells perceive the topological differences between them to regulate cell function remains to be unclear. Here, we systematically studied the changes in stem cell function under the action of MPs and PMPs and elucidated the related mechanisms. Our findings show that the porous structure of PMPs can be sensed by focal adhesions (FAs), which triggers the synthesis of F-actin to inhibit the phosphorylation and degradation of Yes-associated protein (YAP), while also transmitting stress to the nucleus through the contraction of F-actin, thereby enhancing the nuclear translocation of YAP protein. The activation of YAP significantly enhances the proliferation, osteogenesis, paracrine and glucose metabolism of BMSCs, making them exhibit stronger bone repair ability in both in vivo and in vitro experiments. In summary, this study provides a comprehensive and reliable understanding of the behavior of BMSCs in response to MPs and PMPs. It also deepens our understanding of the association between microparticles’ topological cues and biological functions, which will provide valuable guidance for the construction of bone tissue engineering (BTE) scaffolds.
研究领域:
组织工程学
·
细胞生物学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Yinsong Si,Taoqing Huang,Huiqi Xie,Min Chen
Artificial brochosome-shaped microspheres closely mimicking natural brochosomes are highly desired however challenging to synthesize. Herein silica brochosome-shaped microspheres (SiO2 BMs) are successfully synthesized by simply adjusting the NH4OH/p-xylene ratio. The obtained BMs, with a diameter of 530 nm and highly accessible open pores of ∼130 nm, demonstrate high similarity to natural brochosomes in size, shape, and pores geometry. A mechanism of droplets assembly originating from the surface charge transformation of the emulsion droplets is proposed by carefully investigating the in situ dynamic evolution of BMs intermediates. The priority growth of primary particles at the interface of the adjusting droplets forms the pores wall of BMs with regular distribution. Benefiting from the unique structure, the SiO2 BMs show excellent antiadhesion (superhydrophobic) and antireflection (at least 70% reduction for vertical reflection), indicating the high functional similarity to natural brochosomes. The synthesized BMs demonstrate sufficient load capacity, suggesting great potential in energy conversion and biomedical applications.
研究领域:
材料科学
·
仿生学
·
纳米技术
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Mei Chen,Xiao Liang,Wei Hu,Lanying Zhang,Le Zhou,Cuihong Zhang,Junming Wang,Chuizhou Meng,Jingang Fang,Huai Yang
In this paper, uniform epoxy resin polymer microspheres (EMs) with controllable diameters and a narrow size distribution were prepared by precipitation polymerization using liquid crystals (LCs) as the solvent. The effects of the LC solvents on the morphologies of the resultant epoxy resin were thoroughly investigated. It was found that the formation of uniform EMs is sensitive to the properties of the LCs solvents. Uniform EMs can be obtained when the solubility parameters ( δ ) of the used solvent range from 20.59 to 21.29 (cal/cm 3 ) 1/2 and its dispersion terms ( δ d ) are in the range of 19.87–20.89 (cal/cm 3 ) 1/2 . Apart from the effects of solvents, the size of the as-made EMs can be further regulated from 2.6 μm to 10.1 μm by controlling the reactivity of epoxy monomers and the functionality of thiol hardeners. Moreover, we demonstrated that carbonizing the EMs can directly produce uniform carbon microspheres (CMs) with smooth surface. This work enlightens a new way for the preparation of EMs through precipitation polymerization in LCs solvent.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
QUIMICA NOVA
·
2022
·Vol. 45
·期 2
·145-151
·
IF 1.145
Sun Fei,Feng Chao,Wang Yang,Yang Xue,Zhao Hong
The fluorescent microspheres are prepared by the swelling-evaporation method. The optimal swelling conditions are obtained by researching related factors, such as types and dosages of swelling agent, dosages of fluorescent substance, swelling time and swelling temperature. Considering that the structure of microspheres can influence the swelling properties, the paper mainly focuses on the effect of molecular weight and surface carboxyl group content of polystyrene microspheres on swelling properties. When the molecular weight of microspheres is 75276 g mol-1, the density of carboxyl group on their surface is 6.94×10-4 mol g-1, and the doping amount of europium complex reaches the maximum of 24.9 mg g-1 with the strongest fluorescence intensity. Meanwhile, the as-prepared fluorescent microspheres have high monodispersity, uniform particles size and high thermal stability (the decomposition temperature is 385oC), which sets up the good foundation for biomolecule detection. So, this work provides a significant experience for the preparation of fluorescent microspheres.
研究领域:
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 222
·期 19
·2100197
·
IF 2.527
Yinfu Luo,Long Ni,Cheng Zhang,Liwei Yan,Huawei Zou,Shengtai Zhou,Mei Liang
Lightweight and excellent thermal stability hollow polyimide (PI) microspheres play an important role in high-end engineering applications such as aerospace, marine use among others. Herein, a simple approach is proposed to scalable fabrication of hollow PI microspheres with controllable sizes by powder foaming method combined with gradient heating strategy. The diameter of PI microspheres ranges from 295.5 to 1479.6 µm with a wall thickness of ≈7.78 µm. Interestingly, the diameter of PI microspheres exhibits a good correlation with the size of polyester ammonium salt (PEAS) particles. The hollow PI microspheres demonstrate excellent heat resistance with a bulk density ranging from 56.9 to 132.2 kg m –3 . Furthermore, PI microspheres could be readily converted into carbon microspheres without destroying their original integrity, which shows potential applications in preparing multifunctional composites. The proposed method is easily scalable which can be adopted to fabricate hollow PI microspheres at large quantities for industrial applications.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
NUCLEAR ENGINEERING AND DESIGN
·
2020
·
IF 1.62
Shijiao Zhao,Jingtao Ma,Xuping Lin,Xing Cheng,Xingyu Zhao,Shaochang Hao,Ziqiang Li,Changsheng Deng,Bing Liu
Zirconia (ZrO 2 ) microspheres are of great interest as a surrogate precursor material for preparation of uranium nitride (UN) microspheres in High Temperature Reactor (HTR). However, the crystallite transformation of ZrO 2 microspheres in cooling process causes cracking of the microspheres. In our study, crack-free nanocrystalline ZrO 2 microspheres were obtained. The tetragonal phase was stabilized at room temperature without doping any stabilizing additives. Firstly, gel microspheres were prepared through internal gelation process. Subsequent heat treatment of gel microspheres in nitrogen was conducted. The effect of heat treatment was investigated by using simultaneous thermogravimetric analysis and differential scanning calorimetric analysis (TGA/DSC). By using X-ray diffraction (XRD), optical microscopy, and field-emission scanning electron microscopy (FE-SEM), the phase compositions, morphology and microstructures of the heat treated microspheres were characterized. The ZrO 2 microspheres treated at 800 °C exhibit room-stabilized tetragonal zirconia phase, with uniform size of 650 ± 15 μm, good sphericity of 1.02 ± 0.01, and relatively high crush strength 122.5 ± 13.8 N/sphere. Finally, a preliminary nitridation was conducted. Those room-stabilized tetragonal zirconia microspheres can be used as a good surrogate precursor for subsequent preparation of nitride microspheres.
研究领域:
材料科学
·
核能工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2011
·Vol. 47
·期 2
·711-719
·
IF 1.859
Jin Quan,Zheng Mingtao,Wu Yongjian,Xie Chunlin,Xiao Yong,Liu Yingliang
A facile approach was developed for synthesis of carbon hollow microspheres (CHM) via carbonization of the hollow polymer microspheres prepared from polymerization in the presence of l -lysine acted as in situ template. The physical and chemical structures of the samples were investigated by X-ray powder diffraction, Raman spectrum, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). SEM and TEM images show that the products consist of a large scale of monodisperse CHM with a size of about 1.1–1.3 μm. Furthermore, the resulting CHMs possess a surface area of 559 m 2 g −1 and a pore volume of 0.27 cm 3 g −1 . The morphology and the size of the as-obtained samples can be controlled by the polymerization temperature, polymerization time, and the dosage of l -lysine. Moreover, a possible formation mechanism of the CHM has been put forward according to the experimental data available.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Hua-Rong Yang,Shan-Shan Li,Qing-Da An,Shang-Ru Zhai,Zuo-Yi Xiao,Li-Ping Zhang
Novel millimeter hollow microspheres were fabricated from carboxymethyl cellulose microspheres and polyethyleneimine using glutaraldehyde as a crosslinking agent. The hollow microspheres prepared with different polyethyleneimine usages and different polyethyleneimine treatment time were investigated deeply and characterized via SEM-EDX, FT-IR, and BET surface area analysis. It was shown that polyethyleneimine could break the coordination bonds between the carboxyl and Al (III) in carboxymethyl cellulose microspheres, leading to the formation of hollow structures. Most importantly, the usage and treatment time of polyethyleneimine can distinctly tailor the structure of the carboxymethyl cellulose microspheres, resulting in the formation of different hollow microspheres with varied shell thickness and size. Most importantly, we found that the prepared hollow microspheres have excellent adsorption performance toward targeted methyl blue under testing conditions. By virtue of the large accessible amount of -NH 2 groups and its unique hollow structure, this type of millimeter hollow microspheres have broad application prospects in the treatment of emerging contaminants in wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2012
·
IF 3.07
Shengliu Wang,Kai Yue,Lianying Liu,Wantai Yang
When dispersion polymerization of styrene (St) had run for 3 h, after particle rapidly growing stage, 4,4′-dimethacryloyloxybenzophenone (DMABP) cross-linker was added to reaction system and photoreactive, core(PSt)–shell(Poly(St- co -DMABP)) particles with rich benzophenone (BP) groups on surface were prepared. Polymerization of DMABP could occurred mainly on the preformed core of PSt because its diffusion could be impeded by (1) compactness of particles formed at the moment of cross-linker addition (more than 80% of monomer had been consumed, particles were no longer fully swollen by monomer), (2) reduced polarity of continuous phase, and (3) immediate occurrence of cross-linking. Subsequently, photoreactive, cross-linked hollow particles were yielded by removal of uncross-linked core in THF. SEM and TEM observation demonstrated the formation of core–shell structure and improvement of shell thickness when DMABP content increased. UV–vis spectra analysis on polymer dissolved in THF indicated that there is no polymer of DMABP in core. FTIR spectra analysis and XPS measurement further revealed that BP component on particle surface was enriched when amount of DMABP increased. Finally, an anti-fouling polymer (poly (ethylene glycol), PEG) and protein of mouse IgG was immobilized on particle surface under UV irradiation, as confirmed by FTIR spectra analysis, SEM observation and TMB color reaction.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 2
·1-10
·
IF 5.3
Xia Guangping,Hu Haoyun,Huang Yipeng,Ruan Guihua
Controllable synthesis of micro-flower covalent organic frameworks (MFCOFs) with controllable size, monodisperse, spherical, and beautiful flower shape was realized by using 2,5-diformylfuran (DFF) and p-phenylenediamine (p-PDA) as building blocks at room temperature. High-quality MFCOFs (5 − 7 μm) were synthesized by controlling the kind of solvent, amounts of monomers, catalyst content, and reaction time. The synthesized MFCOFs possessed uniform mesopores deriving from the intrinsic pores of frameworks and wide-distributed pores belonging to the gap between the petals. The MFCOFs-packed solid-phase extraction (SPE) column shows adsorption capacity of about 8.85 mg g −1 for 2,4-dichlorophenol (2,4-DCP). The MFCOF-based SPE combined with the HPLC method was established for the determination of 2,4-DCP in environmental water. The linear range of this method is 20–1000 ng mL −1 ( R 2 > 0.9994), and limit of detection (S/N = 3) is 10.9 ng mL −1 . Spiked recoveries were 94.3–98.5% with relative standard deviations lower than 2.3%. Graphical Abstract
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）