Bioresource Technology Reports
·
2019
·
IF 0
Fansheng Meng,Dongfang Liu,Wenli Huang,Zhongfang Lei,Zhenya Zhang
The effects of salinity (0–3%) on algal-bacterial granulation, nutrients removal and lipid production were studied in four identical sequencing batch reactors . Results demonstrated that high salinity (1–3%) enhanced biomass growth and granular settleability with little impact on organics removal and a slightly lower total P removal (57%) obtained. On the other hand, the activity of nitrifying bacteria was found to decrease with the increase of salinity, which was completely inhibited at the salinity of 3%, resulting in nitrite accumulation. No obvious change in lipid content was detected under the tested salinity levels, while its productivity was significantly increased under higher salinity conditions. The dominant lipid component, hexadecenoic acid at the salinity of 0%, shifted to oleic acid when the salinity was increased from 0% to 3%. In addition, high salinity favored the enrichment of Nitzschia rather than Stigeoclonium .
研究领域:
环境科学
·
微生物学
·
生物技术
✓ 已验证
DOI
Materials Today Communications
·
2023
·
IF 3.8
Jinyu Yang,Rui Su,Huimin Ying,Liang Hu,Xiaodong Ruan
The utilization of vat photopolymerization (VPP) technology presents a novel approach for the production of PTFE parts with intricate geometries. Nevertheless, excessive exposure during photocuring and deformation warpage resulting from the debinding and sintering procedures significantly impact the printing precision of these parts. To achieve high quality printing of complex shaped PTFE parts, this research undertook a systematic investigation of the vat photopolymerization 3D printing process and characterized the final parts. Initially, an assessment was conducted on the rheological properties of photocuring slurries featuring different levels of solid loadings, and the Jacob working curves were established for varying solid loadings and dye concentrations to elucidate the impact of slurry components on photocurable properties. Through thermogravimetric analysis , the optimum debinding temperature for printed green bodies was determined, resulting in the production of PTFE parts devoid of any defects or distortions and the effectiveness of the debinding process was verified by Raman spectroscopy . Then conducted a characterization of the density and mechanical properties of 3D printed PTFE parts, revealing a density reached 99.0% of the conventionally machined PTFE parts, as well as tensile and yield strengths of 22.04 MPa and 12.57 MPa, respectively. Finally, PTFE micro-structural surfaces were constructed via vat photopolymerization 3D printing process, resulting in favorable hydrophobic performance. These findings contribute to a comprehensive understanding of the 3D printing process for PTFE material and offer theoretical guidance for the effective production of complex shaped PTFE parts.
研究领域:
材料科学
·
制造工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
He Li,Yongsheng Liu,Yansong Liu,Kehui Hu,Zhigang Lu,Jingjing Liang
Solvents assist in the debinding of stereolithography-based 3D-printed alumina green bodies. The green bodies subsequently undergo thermal debinding and sintering to obtain alumina ceramics. In this study, several solvents were tested, including polyethylene glycol, oxalic acid, ammonium hydroxide, ethyl alcohol, methyl methacrylate, butyl acetate, dimethyl carbonate, methanol, ethyl acetate, and sec-butyl alcohol. The tested solvents during the debinding process showed different effects on microstructure and properties of 3D-printed alumina ceramics due to the variable aspects of their solubility toward the binders. The microstructure of the samples changed significantly after green bodies underwent solvent debinding, thermal debinding, and sintering, leading to loose spongy structures, porous aggregates, and compact structures, respectively. Shrinkage, bulk density, and open porosity changed slightly due to the debinding function of different solvents. Polyethylene glycol-impregnated samples displayed the minimum shrinkage in length direction (5.3%). Ethyl alcohol-impregnated sample showed minimum shrinkage in width (4.8%) and height (11.5%) directions. Ammonium hydroxide-impregnated samples exhibited minimum bulk density (2.8 g/cm3) and maximum open porosity (28.3%). Dimethyl carbonate-impregnated samples presented minimum flexural strength (32.6 MPa), and oxalic acid-impregnated samples revealed maximum flexural strength (63.4 MPa). In sum, the as-obtained ceramics would be used as ceramic cores for hollow blades in aircraft engines due to their high open porosity and moderate flexural strength.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Foods
·
2019
·Vol. 8
·期 6
·181
·
IF 3.011
Rui Li,Qi Ding,Xin-Huai Zhao
The impact of milk fortification on the microbiological and physicochemical properties of a set-type skimmed yoghurt using three commercial soluble prebiotics (inulin, iso-malto-oligosaccharides, and xylo-oligosaccharides) at either 3 or 5 g/kg was assessed. The three prebiotics had an insignificant impact on yoghurt fermentation because all yoghurt samples had similar titratable acidity and similar pH values after their lactic acid fermentation. Regarding the control yoghurt samples without prebiotics usage, the prebiotics-fortified yoghurt samples showed no difference in their main chemical compositions, hardness, syneresis extent, and apparent viscosity (p> 0.05), but had a slightly higher lactic acid content and a viable quantity of starter strains. All yoghurt samples had the same acetic acid content, while propionic and butyric acids were not produced. Yoghurt storage at 4 °C for 21 day gave these yoghurt samples decreased pH values and a viable quantity of starter strains (especiallyLactobacillus delbrueckiisubsp.bulgaricus) and unchanged acetic acid; however, it increased lactic acid contents. Overall, prebiotics fortification up to 5 g/kg had a completely insignificant impact on the fermentation and quality attributes of yoghurt samples but could possibly improve the health of consumers due to higher dietary fibers and starter strain populations.Keywords:set-type skimmed yoghurt;inulin;iso-malto-oligosaccharides;xylo-oligosaccharides;yoghurt quality
研究领域:
食品科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Kejie Wang,Rongzhen Liu,Chonggao Bao
In this study, the method and mechanism of the improvement of the curing thickness of SiC by stereolithography (SLA) were investigated, the rheological properties of SiC paste were optimised, and the problem of cracking problem during debinding was solved. The best moulding process for preparing SiC ceramics with the Ceramaker 900 equipment was studied. Oxidation at 1180 °C for 1 h and hydroxylation with 0.6 mol/L H 2 O 2 were the best modification processes for SiC powder. SiC paste with good rheological properties and high curing thickness was prepared using a resin system of BPA, HDDA, TPGDA, TMPTA, DPHA, and A-BPEF (mass ratio = 9:7:5:20:15:6). The best debinding process for SLA SiC was segmented debinding. The bulk density, total porosity, and room temperature bending strength of the SiC ceramics obtained are 2.13 g/cm 3 , 10.2%, 229 MPa, respectively. The nanoindentation elastic modulus and hardness of SLA SiC ceramics were found to be 18.7 and 1.66 GPa, respectively. Through this process, a lattice structure of SiC parts with good surface quality was prepared.
研究领域:
材料科学
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Minhao Shen,Renli Fu,Yi Zhang,Kuang Sun,Wei Xu,Yanlin Jiang,Zhe Zhao,Ming Liu
Vat photopolymerized 3D printing technology can be used to fabricate ceramics with complex shapes. However, the extensive use of photosensitive resins as binders is not conducive to achieving crack-free ceramic green parts, especially the Si 3 N 4 ceramics with the weak interlayer bonding. In this work, the influence of different debinding atmosphere on the pyrolysis process of organics in vat photopolymerization 3D printed Si 3 N 4 green parts was investigated. The results showed that the use of 95 vol% N 2 +5 vol% H 2 atmosphere can effectively inhibit the cracking during the debinding process, especially the wall thickness of the 3D printed defect-free Si 3 N 4 green body was successfully increased to 5 mm, and the obtained sintered Si 3 N 4 ceramics exhibited higher true densities and better mechanical properties. The debinding atmospheres proposed in the current work provided additional options of debinding atmosphere for achieving high-performance 3D printed Si 3 N 4 ceramics and are expected to be expanded to other photosensitive slurry systems, with the potential to enable the production of ceramic components with the larger wall thicknesses.
研究领域:
材料科学
·
陶瓷制造
·
3D打印技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yiru Shen,Ying Sun,Bocheng Jin,Ming Li,Bohang Xing,Zhe Zhao
With no extra assistance of CIP or HIP, YAG transparent ceramics were successfully fabricated by digital light processing (DLP) stereolithography method followed by careful debinding and vacuum sintering. We systematically studied the effect of heating rate, atmosphere during debinding and the heating rate, holding time during sintering on the light transmittance of YAG ceramics. All results indicated that debinding in the 95N 2 /5H 2 mixture is the key controlling factor for achieving better densification and optical properties , regardless of the sintering profile. However, a lower heating rate can indeed promote the densification process and balance some shortcomings linked with the debinding in air. At least, three different debinding processes and three different sintering profiles are combined, which leads to a high in-line transmittance of ∽77%.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 29
·16344-16348
·
IF 2.936
Chang Liu,Bin Qian,Xiaofeng Liu,Limin Tong,Jianrong Qiu
Additive manufacturing of silica glass by stereolithography is a new technology. Improving the efficiency of this technology is an important issue. In this work, a stereolithography system using top-down approach and a compatible suspension for this approach was developed. The debinding behavior of the green part (the solidified suspension) was discussed in detail based on the results of thermogravimetric analysis and Fourier transform infrared absorption spectroscopy. A fast heat treatment within 16 hours was adopted for debinding and sintering of the green part which took only 1/3 of the time of previous report. Designed glassware which could not be processed by conventional technologies was manufactured in this way, and the products showed similar properties with fused silica, as confirmed by X-ray diffraction and UV-vis-IR spectrometer.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER METALLURGY
·
2024
·
IF 1.9
Haihong Ma,Shuncheng Fang,Zhengfa Zhou,Fengmei Ren,Weibing Xu,Guoming Chen
Metal injection molding (MIM) is a net-forming technology for manufacturing miniature metal parts, which can improve the manufacturing accuracy of complex-shaped parts. In this study, aluminum stearate was used to modify the 17-4PH stainless steel powder, the binder was composed of (PMMA) and (PEG) with the volume ratio of 7:3. The effects of aluminum stearate surfactant amount on the feedstock viscosity, water debinding rate and thermal debinding shape were studied. The results showed that the coating of aluminum stearate breaks the agglomeration between the powders and decreases the viscosity of the feedstock. When the addition of aluminum stearate was 0.6wt% of the powder mass, the melt index, density and flexural modulus of the feedstock were 81.5 g/10 min, 5.44 g/cm3, and 1643Mpa, respectively, and the thermal debinding shape retention was the best of all debinded parts. However, too much aluminum stearate makes the feedstocks thicker and the green part weaker.
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
Chemical and Biological Technologies in Agriculture
·
2023
·Vol. 10
·期 1
·1-12
·
IF 6.6
Zheng Lei,Zhu XingYi,Wang Jialu,Su Weike
Mechanochemical-assisted extraction (MCAE) and mechanochemical-assisted enzyme catalysis (MCAEC) methods were developed for extraction and enzymatic hydrolysis of calcium phytate from defatted rice bran, respectively.The MCAE conditions were optimized by response surface methodology: 10% sodium carbonate as the solid reagent, 33 min grinding time, 18:1 ball–material ratio, 330 rpm ball milling speed, and pH 5.5 extraction. Under these conditions, the yield of calcium phytate was 97.0 mg/g. The MCAEC conditions were optimized as follows: 2% enzyme addition, MM400 milling time 36 min, PM400 milling speed 262 rpm, MM400 milling frequency 27 Hz, and the addition of pH 5.5 sodium acetate buffer 3 mL. Under these conditions, the hydrolysis rate of calcium phytate was 39.7%.Compared with traditional extraction and enzymatic hydrolysis methods, MCAE and MCAEC could obtain higher yields and hydrolysis rates, respectively.
研究领域:
食品科学
·
化工工程
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Guilin Wang,Youwang Hu,Yandong Wang,Xiaoyan Sun,Pingmei Ming,Feng Wang
Digital light processing (DLP) 3D printing technology fabricates silica glass parts with complex structures using a layer-by-layer curing approach. In this process, plasticizers directly influence the fluidity of the slurry, printing quality, debinding and sintering properties. However, the impact of plasticizers on DLP 3D printed silica glass remains underexplored. This study systematically investigates the influence of plasticizers on key fabrication processes in 3D printed silica glass. The results show that higher diethyl phthalate (DEP) content increases slurry viscosity while decreasing the crosslinking degree of monomers and the flexural strength of the green body. Despite these adverse effects, the green body achieves superior surface quality with elevated DEP content. Plasticizers reduce the extent of thermal decomposition in green bodies within a narrow temperature range. During debinding, DEP incorporation promotes the development of interconnected channels and pores, facilitating the evacuation of gaseous products and minimizing defect formation. Dense amorphous silica glass can be obtained at a temperature of 1300 °C. The 3D printed silica glass exhibits significant improvements in terms of density, surface quality and optical properties when the DEP content is between 10 wt% and 20 wt%. This research offers an important theoretical foundation for developing photopolymerization 3D printing technology applicable to silica glass.
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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Dun Wu,Shuai Qin,Huiting Liu,Zheng Cao,Junfeng Chen,Bijun Fang,Chunlin Liu
Lead zirconate titanate-based piezoelectric ceramics (Pb 0·91 La 0·06 (Zr 0·58 Ti 0.42 ) 0.975 Nb 0·02 O 3 , PLZT) were prepared by water-soluble defatted powder injection molding using bismuth stearate as surfactant . The effects of bismuth stearate surfactant amount on the feed viscosity, water degreasing rate and electrical properties were studied. The results showed that the bismuth stearate coating reduces agglomeration between the PLZT powders and decreases the viscosity of the feed. During sintering, bismuth stearate is decomposed into bismuth oxide, which acts as sintering aid to increase the density of the sintered bismuth stearate-coated PLZT ceramics. Bi 3+ dissolves into the perovskite crystal lattice , which increases the tetragonality factor and the content of tetragonal phase, and improves the dielectric, ferroelectric and piezoelectric properties of the bismuth stearate-coated PLZT ceramics. This study provides a novel modification method for the production of injection molded ceramics using a water-soluble binder system.
研究领域:
材料科学
·
陶瓷工程
·
电子材料
✓ 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）