Polymers
·
2020
·Vol. 12
·期 4
·964
·
IF 3.426
Jianfeng Zhang,Shuxin Gong,Jiahang Zhu,Jiejing Zhang,Jing Liang
A cost-effective, simple, and time-saving method to fabricate mono-dispersed periodic microsphere structures on substrates with patterned sites is very meaningful due to their significance on various biological studies. Herein, a simple and facile method to fabricate mono-dispersed microsphere arrays on porous substrates was developed. The mixture of polystyrene and an organic stabilizer solution which contains aqueous solution, fabricated through shaking, was applied to prepare microemulsion solution. An ordered porous structure was produced by spreading and evaporating the solvent of microemulsion on a glass slide, accompanied by the enrichment of didodecylamine in the cavities. The porous cavities were further modified with polyacrylic acid and poly(diallyldimethylammonium chloride) which could immobilize the microspheres. The charged microspheres were incorporated into the cavities by an electrostatic interaction with the oppositely charged polyelectrolytes. The positive polyelectrolytes with abundant charges as well as a suitable content and dimension of microspheres, ensured the formation of mono-dispersed and ordered arrays. Considering that other charged particles were universally suitable for the present strategy, the reported approach opened an efficient way for the preparation of microsphere-based materials.Keywords:microemulsion;porous structures;mono-dispersed microsphere array
研究领域:
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
INTEGRATED FERROELECTRICS
·
2017
·
IF 0.457
Bo Yang,Guo-Ling Li,Hai-Lin Cong,Bing Yu,Lei Wang,Shu-Jing Yang
In this study, we prepared a porous poly (glycidyl methacrylate) (PGMA) microsphere by modified seed-swelling emulsion polymerization. The structure and morphology of the porous microspheres were characterized by SEM. We discussed the effect of the ratio of crosslinker and monomer on microsphere formation and micropores, and found the most favorable conditions for the preparation of porous PGMA microspheres. The great structure and specific surface area of the porous microspheres and the active functional groups on the surface indicate a wide range of applications.
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
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2012
·Vol. 12
·期 9
·7280-7283
·
IF 1.563
Yang Renchun,Tang Dingxing,Ma Fengyun,Tao Ting Xian,Ren Yiming,Chen Zhiming,Zhang Cuige,Li Fang
A facile one-pot route for the synthesis of monodisperse Ag nanocrystals with a narrow size distribution is described. Uniform Ag nanoparticles with the size of around 12 nm were obtained by reduction of AgNO3 in the presence of oleylamine and polymer polyvinylpyrrolidone
(PVP) at low temperature. It is found that temperature has a significant effect on the sizes and the size distributions of the nanoparticles. Because irregular Ag nanoparticles are produced easily due to Ostwald ripening or kinetic control at both high temperature and low temperature, respectively,
uniform nanocrystals can be obtained at an appropriate temperature (70 °C).
研究领域:
纳米材料科学
·
化学合成
✓ 已验证
DOI
PubMed
高影响因子
RARE METAL MATERIALS AND ENGINEERING
·
2016
·
IF 0.236
Dong Chunfa,Zhang Xianglin,Cai Hao,Cao Chuanliang
A simple and environmentally friendly method was developed for preparing colloidal silver nanoparticles in aqueous solutions using silver nitrate, sodium alginate and glucose as silver precursor, capping agents and reducing agents, respectively. The formation of silver nanoparticles was observed by the change of color from colorless to yellow. The silver nanoparticles were characterized by transmission electron microscopy (TEM), UV-visible spectroscopy (UV-vis) and X-ray diffraction (XRD). The TEM images show that the particles are small, well dispersed and spherical in shape with a narrow distribution from 3 nm to 12 nm. The XRD demonstrates that the obtained metallic nanoparticles are single crystalline silver nanoparticles. The effects of the reaction time, the reaction temperature and the concentration of silver ion and reducing agent on the particle size were investigated by the UV-vis spectra. The present process is an excellent candidate for the preparation of silver nanoparticles because it is simple, free-pollutant, inexpensive and easy to perform. The method may be extended to other noble metals, such as Au, Pd and Pt, for medicinal, industrial and technological applications.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
DOI
高影响因子
Materials
·
2019
·Vol. 12
·期 22
·3712
·
IF 2.972
Jianmei Wang,Xueying Wang,Pingan Zhu,Chengmin Chen,Jianchun Wang,Yan Li,Liqiu Wang
Monodisperse polyvinyl alcohol (PVA) microspheres have been widely used for targeted drug delivery, embolization, and templates. However, the fast and facile fabrication of PVA microspheres with uniform size and internal structure and good sphericity remains a challenge. In this study, the PVA microspheres with uniformity in the size, shape, and internal structure were rapidly fabricated, using single-emulsion droplet templates by an on-chip approach. First, we designed a polydimethylsiloxane (PDMS) microfluidic chip integrated with three functional units, used for the droplet generation, mixing of reagents, and pre-curing of PVA microspheres, respectively. Then, we precisely controlled the generation of PVA aqueous droplets, mixing of reagents, and the gelation rate for the production of high-quality microspheres by adjusting the pH value, flow rate, and the channel structure. The prepared PVA microspheres are characterized with good sphericity, uniform internal structure, and narrow size distribution. The microspheres have good adsorption capacity and recyclability for small-molecule drugs, as demonstrated by the adsorption and desorption of methylene blue (MB). The adsorption behavior is well described by the pseudo-second-order model, and intraparticle diffusion is as fast as the external film diffusion.Keywords:PVA;monodisperse microspheres;adsorption;microfluidic chips
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
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 4.1
Wang Si-Yu,Xu Xin-Rui,Qiu Xin-Xin,Huang Xiao-Li,Wang Xin-Qi,Chen Zhi-Yong
The construction of monodisperse microporous organic microspheres is deemed a challenging issue, primarily due to the difficulty in achieving both high microporosity and uniformity within the microspheres. In this study, a series of fluorinated monodisperse microporous microspheres are fabricated by solvothermal precipitation polymerization. The resulting fluorous methacrylate-based microspheres achieved higher than 400 m 2 /g surface area, along with a yield of over 90% for the microspheres. Through comprehensive characterization and simulation methods, we discovered that the introduction of fluorous methacrylate monomers at high loading levels is the key factor contributing to the formation of the microporosity within the microspheres. The controlled temperature profile was found to be advantageous for achieving a high yield of microspheres and increased uniformity. Two-dimensional assemblies of these fluorinated microsphere arrays exhibited superhydrophobicity, superolephilicity, and water sliding angles below 10°. Furthermore, a three-dimensional assembly of the fluorinated microporous microsphere in a chromatographic column demonstrated significant improvement in the separation of Engelhardt agent compared to commercial columns. Our work offers a novel approach to constructing fluorinated monodisperse microporous microspheres for advanced applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 1
·446-451
·
IF 8.897
Yu Yongsheng,He Lin,Xu Junjie,Li Jiaming,Jiang Sida,Han Guanghui,Jiang Baojiang,Lei Wenjuan,Yang Weiwei,Hou Yanglong
The ordered Pt-based intermetallic nanoparticles (NPs) with small size show superior magnetic or catalytic properties, but the synthesis of these NPs still remains a great challenge due to the requirement of high temperature annealing for the formation of the ordered phase, which usually leads to sintering of the NPs. Here, we report a simple approach to directly synthesize monodisperse ordered L1 0 -FePt NPs with average size 10.7 nm without further annealing or doping the third metal atoms, in which hexadecyltrimethylammonium chloride (CTAC) was found to be the key inducing agent for the thermodynamic growth of the Fe and Pt atoms into the ordered intermetallic structure in the synthetic process. In particular, 10.7 nm L1 0 -FePt NPs synthesized by the proper amount of CTAC show a coercivity of 3.15 kOe and saturation magnetization of 45 emu/g at room temperature. The current CTAC-assisted synthetic strategy makes it possible to deeply understand the formation of the ordered Pt-based intermetallic NP in solution phase synthesis.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 7
·1-9
·
IF 2.009
Zhang Aiqin,Xiao Yuanhua,Das Paramita,Zhang Linsen,Zhang Yong,Fang Hua,Wang Lixia,Cao Yang
Silver nanoparticles (AgNPs), especially with small size, are easy to release silver ion in aqueous solution owing to various reasons, which would significantly affect the stability, properties, and application of AgNPs. In this paper, monodisperse AgNPs with small size of ca. 10 nm were successfully prepared based on solid-state reactions. Ascorbic acid (AA) was used as reductant and tannic acid (TA) was used both as reductant and stabilizer in this environmentally friendly reaction. The dissolution and regeneration of the as-prepared TA-AgNPs in pure water were investigated by UV−vis spectra, TEM observations, and differential pulse anodic stripping voltammetry. The results indicated that the TA-AgNPs showed a little higher dissolution than conventional PVP-coated ones with similar size. However, the dissolved silver ion in the TA-AgNPs aqueous solution could be recovered just by adjusting the pH of the solution, which could be attributed to the reductant performance of TA at alkaline conditions. After regeneration, some smaller nanoparticles appeared in TA-AgNPs aqueous solution, indicating that new nucleation formed and the dissolved silver ions were actually recovered to Ag 0 .
Graphical abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2012
·
IF 2.105
Jing Liu,Lu Wang,Jing Wang,Lantong Zhang
A new solvothermal method is proposed for the preparation of Fe 3 O 4 nanoparticles (NPs) from iron acetylacetonate in the presence of oleylamine and n- hexane. The products are characterized by X-ray powder diffraction, infrared (IR) spectroscopy, transmission electron microscopy, thermogravimetry/differential thermogravimetry (TG/DTG) analysis, and vibrating sample magnetometery. The new procedure yields superparamagnetic monodispersed Fe 3 O 4 particles with sizes ranging from 7 nm to 12 nm. The nanocrystal sizes are controlled by adjusting the volume ratio of oleylamine to n- hexane. IR and TG/DTG analyses indicate that the oleylamine molecules, as stabilizers, are adsorbed on the surface of Fe 3 O 4 NPs as bilayer adsorption models. The surface adsorption quantities of oleylamine on 7.5 and 10.4 nm-diameter Fe 3 O 4 NPs are 18% and 11%, respectively. The hydrophobic surface of the obtained nanocrystals is passivated by adsorbed organic solvent molecules. These molecules provide stability against agglomeration, enable solubility in nonpolar solvents, and allow the formation of magnetic polymer micelles.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2014
·
IF 0.371
Xue Lei,Bing Yu,Hai-Lin Cong,Chao Tian,Yue-Zhong Wang,Qian-Bin Wang,Chuan-Kuo Liu
Monodisperse silica microspheres have drawn much attention for having important applications in many areas. In this paper, a series of monodisperse silica (SiO2) microspheres was synthesized successfully using a modified Stöber method in which tetraethyl orthosilicate (TEOS) was continuously supplied into the reaction system by a syringe pump. By changing the supply rate of TEOS, the diameters of the obtained SiO2 microspheres were controlled very well from 1 μm to 3 μm. Detailed characterization of the silica particles was performed using scanning electron microscopy (SEM).
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
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 3
·1-6
·
IF 2.02
Chen Shun,Ju Yanyun,Guo Yi,Xiong Chuanxi,Dong Lijie
Ag NPs were in-site synthesized through microemulsion method by reducing silver acetate with oleylamine-mediated at 70 °C with highly monodisperse and narrow size from 10 to 20 nm. The synthesis of Ag NPs was aided by oleylamine and the role of oleylamine was researched. This in-site synthesis approach to Ag NPs was reproducibility and high yield more than 80% with stable store about 6 months.
研究领域:
纳米材料
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Heqin Huang,Yuanyuan Ding,Xilu Chen,Zhiyong Chen,Xiang Zheng Kong
A facile method was proposed to produce monodisperse poly(divinylbenzene) microspheres in a quiescent mode by means of a combination of solvothermal process and classical precipitation polymerization. Spherical particles were obtained using this method at a monomer concentration of 20 wt%, with respective to the solvent, that was 2–4 folds higher than that in traditional precipitation polymerization. The diameter of monodisperse microspheres could be controlled in the range of 0.88–4.18 μm by adjusting reaction conditions. When the reaction temperature was optimized between 85 °C and 100 °C, above the boiling point of the solvent, i.e. acetonitrile, the yield of microspheres reached 93.7% within 4 h of polymerization with a narrowed polydispersity index of 1.033. The uniformity of the microspheres was improved by adjusting initiator concentration. This polymerization strategy with high efficiency is of potential in fabrication of various monodisperse microspheres.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）