JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Le Zhang,Yaozong Li,Xiaoyang Li,Hao Yang,Xuebin Qiao,Tianyuan Zhou,Zhongying Wang,Jian Zhang,Dingyuan Tang
Solid content of suspension for spray drying was systematically investigated to obtain spherical and dense Nd: granulated particles. The rheological behavior, morphology, size and distribution, apparent and tap densities, and transmittance measurements were used as tools to guide the selection of solid content of suspension. The balanced solid content were 42.0 wt.%. The granulated particles exhibited close to mono-dispersed, spherical and uniform dense aggregates, and mean size was ∼35 μm. Under 60 MPa pressure, the granules were completely crushed without obvious inter-granules void. The homogeneous element distribution and fine microstructure provided high optical quality of Nd:YAG ceramics and the transmittance at 1064 nm reached up to 84.90%.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 48
·28680-28694
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IF 3.119
Zhihui Yang,Guangfeng Wu
A synthetic method was developed to prepare biodegradable waterborne polyurethanes (BHPUs) with a high solid content by introducing different molecular weights of poly(ethylene glycol) (PEG) into poly(ε-caprolactone) (PCL)-based polyurethanes. PCL is a semi-crystalline polymer that can be degraded in lipase to prepare biodegradable waterborne polyurethanes. The biodegradability of BHPUs was evaluated, and the results showed that BHPU samples could be degraded in a solution of phosphate-buffered saline (PBS)/lipase but not in PBS. Two different synthesis routes were used to prepare the BHPUs, which resulted in different association relationships between the ionic hydrophilic polymer dimethylol propionic acid (DMPA) and a nonionic hydrophilic polymer (PEG). The influence of the association relationship between DMPA and PEG on the solid content and other BHPU properties was investigated. The results showed that the method of associating all PEG molecules with DMPA increased the crystallization, tensile properties, and water and soil repellency of the BHPU samples. The solid content of the BHPU samples increased from 41% to 52.7%. In addition, PEG with molecular weights of 400 g mol−1 and 1000 g mol−1 had the best effect on the dispersibility and stability of BHPU samples when incorporated into a polyurethane backbone.
研究领域:
材料科学
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生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 14
·期 6
·1087-1099
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IF 3.552
Zhang Weihong,Wang Dan,Wang Jie-Xin,Pu Yuan,Chen Jian-Feng
In this work, we developed a continuous preparation strategy for the production of high-solidscontent waterborne polyurethane (WPU) emulsions via high-gravity-assisted emulsification in a rotating packed bed (RPB) reactor. By adjusting the experimental parameters and formula, WPU emulsions with a high solids content of 55% and a low viscosity were prepared. Preliminary applications of the high-solids-content WPU as a thermally insulating material were demonstrated. RPB emulsification is an economical and environmentally friendly production strategy because of the low energy consumption, short emulsification time, and effective devolatilization. This study demonstrated an effective method for preparation of high-solids-content WPU, moving toward commercialization and industrialization.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Micro & Nano Letters
·
2016
·Vol. 11
·期 3
·164-168
·
IF 0.723
Xinxin Sheng,Delong Xie,Wenxing Yang,Xinya Zhang,Li Zhong
Core–shell nanosized polymer particles with poly(butyl acrylate) (PBA) as core and poly(methyl methacrylate) (PMMA) as shell were synthesised via a semi-continuous two-stage microemulsion polymerisation. A series of experiments were conducted to investigate the maximum solid content of the microemulsion under different surfactant/monomer ratios, and it was found that the maximum solid content could reach around 43.73% with minimum surfactant/monomer at only 5.25 wt%. The particle samples were characterised by proton nuclear magnetic resonance ( 1 H-NMR), scanning electron microscopy, transmission electron microscopy (TEM) and dynamic light scattering (DLS) techniques. 1 H-NMR and TEM results revealed that PBA/PMMA core/shell composite latexes were synthesised successfully by microemulsion polymerisation. DLS studies indicated that an optimal dosage of surfactant (1.29 wt% of the total amount of monomers) was found to synthesise particles with desired core–shell structure, which was consistent with the theoretical calculation. The size of nanoparticles increased with the increase in the amount of core monomer, showing an inverse relationship with surfactants.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2019
·Vol. 17
·期 1
·239-247
·
IF 1.074
Xingbang Li,He Zhong,Jingxian Zhang,Yusen Duan,Hainan Bai,Jingjing Li,Dongliang Jiang
Stereolithography is an attractive technique for the fabrication of complex-shaped ceramic components with high dimensional accuracy. One of the challenges in this technology is the development of high solid loading, low viscosity photosensitive ceramic suspension. In this study, the dispersion of zirconia in photocurable resin and the slurry properties were intensively investigated. Rheological measurements showed that DISPERBYK-103 proved to be an effective dispersant. 42 vol% ZrO 2 suspension was successfully prepared using 3.5 wt% DISPERBYK-103 as the dispersant, with a suitable viscosity (4.88 Pa·s) below the maximum allowable viscosity value (5 Pa·s) for stereolithography applications. The adsorption behavior of DISPERBYK-103 on the surface of zirconia powders was characterized by TG and FT-IR, confirming the dispersion effect of dispersant. Contact angle measurements were also conducted to show that the adsorption of DISPERBYK-103 could help to improve the wettability between powder and photocurable resin. Results showed that DISPERBYK-103 was effective for the preparation of suitable slurries for the development of ZrO 2 ceramics through stereolithography.
研究领域:
材料科学
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陶瓷工程
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高分子材料
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增材制造
·
表面化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 46
·期 4
·4720-4729
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IF 3.45
Guojiao Ding,Rujie He,Keqiang Zhang,Min Xia,Chengwei Feng,Daining Fang
Stereolithography based additive manufacturing provides an effective method to fabricate complex-shaped SiC ceramic components. The dispersion and stability of the ceramic slurry are very important for stereolithography. In this study, the dispersion and stability of SiC ceramic slurries were investigated systematically. The effects of resin monomers , dispersants , particle size, solid loading and ball milling time on the dispersion, rheological behavior and stability of SiC ceramic slurries were studied in detail. Finally, an optimal SiC ceramic slurry for stereolithography based additive manufacturing was obtained, and complex-shaped SiC ceramic architectures were fabricated.
研究领域:
材料科学
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先进制造
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陶瓷工程
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高分子材料
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复合材料
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2019
·
IF 2.994
Jin Tan,Rong Li,Zi-Tao Jiang,Shu-Hua Tang,Ying Wang
To circumvent the limitation of conventional high performance liquid chromatography (HPLC) method, synchronous front-face fluorescence spectroscopy was applied for the rapid and non-destructive determination of two major methylxanthines (theobromine and caffeine) and cocoa solid contents in dark chocolate for the first time. Total synchronous fluorescence spectra at wavelength interval (Δλ) between 30–100 nm of 21 brands of commercial dark chocolate bars with labeled cocoa solids of 50–100% were directly obtained at front-face geometry. The contents of the two methylxanthines were determined by HPLC. Partial least squares regression (PLSR) models for quantification were constructed, optimized, and validated by both full ( leave-one-out ) cross-validation and external validation. The coefficients of determination ( R 2 ) values are larger than 0.8, and the relative errors of prediction were ca. 10%. The built models were applied to the detection of four real samples and compared with HPLC method. The combination of front-face fluorescence and PLSR provides a fast and non-invasive procedure for the quantification of theobromine and caffeine in dark chocolate, as an effective alternative for the traditional HPLC method. The further application of the proposed strategy is the rough estimation of cocoa solids in dark chocolate.
研究领域:
食品科学
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分析化学
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光谱学
✓ 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）