VACUUM
·
2023
·
IF 4
Zhentao Zhou,Heng Xiong,Baoqiang Xu,Bin Yang,Wenlong Jiang
The controllable preparation of materials with unique structures and morphologies has become an important field in the development of nanomaterials . In this study, Sb 2 S 3 was used as the evaporation source to controllably prepare Sb 2 S 3 crystals with various morphologies under a vacuum. At 873 K and 30 min, antimony sulfide in the form of cauliflower-like was effectively made. At the same temperature and for 60 min, tubular antimony sulfide was formed. The initial forming conditions of fascicle-like antimony sulfide were at 873 K and 100 min and did not change with the increase in temperature. During the evaporation process, some antimony sulfide will condense into lumps, showing irregular feather-like and round particles. The products prepared by this method were analyzed and tested. The results showed that the grade of antimony sulfide prepared by this method was further improved, and the content of Sb and S increases by 1.64% and 1.21% on average. This method offers a simple production process, a more regular product shape, and does not require the use of any additives.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
FOOD CONTROL
·
2023
·
IF 6
Jiage Ma,Tianzhu Li,Nianxu Dou,Yanan Li,Qingyun Wang,Mengguo Wu,Yusi Miao,Jinzhe Li,Chengcheng Su,Lijun Chen,Muhammad Altaf Hussain,Juncai Hou,Zhanmei Jiang
Concentrated goat milk products are attracting more and more attention in the food industry. This research was performed to investigate the effects of different levels of vacuum evaporation concentration pretreatment on the physicochemical characteristics and in vitro digestion of fermented goat milk (FGM). Concentrated FGM showed higher contents of protein, fat and total solids, longer fermentation time, higher viscosity, increased yellowness vision and enhanced texture characteristics, while exhibited smaller average casein micelle sizes compared to pristine FGM samples. Meanwhile, concentration pretreatment improved the titratable acidity, water holding capacity , emulsion and microbial stability of concentrated FGM as compared with unconcentrated control during 21 days of storage at 4 °C. Principal component analysis showed that the overall quality improvement of FGM was greatest at a concentration gradient of 25% (v/v). FGM with higher concentration gradient exhibited lower protein digestibility and degree of hydrolysis, while higher antioxidant capacities at the end of gastrointestinal digestion than those of control. Heatmap further suggested that CFGM showed better physicochemical and organoleptic characteristics than unconcentrated FGM. This study provided a theoretical reference for industrial processing of novel FGM products with compacter structure, better storage stability, stronger antioxidant capacity and higher consumer's acceptability by vacuum-assisted evaporative concentration.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2020
·Vol. 15
·期 4
·e2485
·
IF 1.06
Qinyue Zheng,Xuelai Zhang,Jun Ji,Xinchen Zhou
In this study, an experimental investigation was conducted into the characteristics of different varieties of additives (including CaCl 2 , ethanol, and TiO 2 nanoparticles) in the vacuum ice-making system under adsorption condition. The concentration of CaCl 2 , ethanol, and TiO 2 nanoparticles were treated as experimental variables, while the supercooling degree, ice packing factor (IPF), flashing rate, thermal conductivity, and latent heat were taken as evaluation parameters. According to the experimental results, 0.20 wt% TiO 2 nanoparticles and 1 wt% CaCl 2 are applicable as additive, the former is superior to the latter, and ethanol is not suitable for use as additive. Under the optimal conditions, compared with distilled water, the supercooling degree, IPF, and thermal conductivity of TiO 2 nanofluids are improved by 77.92%, 40.61%, and 57.23%, respectively; for CaCl 2 solution, the supercooling degree and IPF are improved by 9.96% and 84.67%, respectively. Furthermore, though the flashing rate increases with the addition of additives, the flashing driving force remains sufficient. The latent heat of nanofluids is barely affected by the addition of nanoparticles. As the CaCl 2 concentration is on the rise, both the thermal conductivity and the latent heat of CaCl 2 solution show a decreasing trend.
研究领域:
制冷工程
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Dong Liu,Xianyuan Jiang,Hao Wang,Hao Chen,Ying-Bo Lu,Siyu Dong,Zhijun Ning,Yong Wang,Zhongchen Wu,Zongcheng Ling
Perovskite single crystals have attracted tremendous attention owing to their excellent optoelectronic properties and stability compared to typical multicrystal structures. However, the growth of high-quality perovskite single crystals (PSCs) generally relies on temperature gradients or the introduction of additives to promote crystal growth. In this study, a vacuum evaporation crystallization technique is developed that allows PSCs to be grown under extremely stable conditions at constant temperature and without requiring additives to promote crystal growth. The new method enables the growth of PSCs of unprecedented quality, that is, MAPbBr 3 single crystals that exhibit an ultranarrow full width at half maximum of 0.00701°, which surpasses that of all previously reported values. In addition, the MAPbBr 3 single crystals deliver exceptional optoelectronic performance, including a long carrier lifetime of 1006 ns, an ultralow trap-state density of 3.67 × 10 9 cm −3 , and an ultrahigh carrier mobility of 185.86 cm 2 V −1 s −1 . This method is applicable to various types of PSCs, including organic–inorganic hybrids, fully inorganic structures, and low-dimensional structures.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2025
·
IF 5.8
Yuan Tao,Bowen Yan,Nana Zhang,Jianxin Zhao,Wei Chen,Daming Fan
Microwave vacuum evaporation (MVE) is a promising alternative over traditional vacuum evaporation, offering rapid evaporation rates and high efficiency. This study investigated the MVE processes and the resulting quality of sugar solutions under varying microwave power densities (10–50 W/g) and vacuum levels (40–80 kPa). The results indicated that a moderate microwave power density (∼30 W/g in this study) was optimal for MVE, balancing both evaporation efficiency and sugar quality. Furthermore, the dielectric properties of the sugar solutions during MVE (over the temperature range of approximately 25-110°C) exhibited a time-dependent decrease in the dielectric constant (ε′), whereas both the dielectric loss factor (ε′′) and loss tangent (tanδε) initially decreased before increasing. Similar values of ε′′ and tanδε were observed for sugar solutions evaporated at high power densities, accounting for the phenomenon of saturated evaporation. The penetration depth, reflection loss, and relative input impedance results indicated that the 4 mm-thick sugar solutions exhibited good microwave absorption during the MVE, except at the initial and final stages, confirming the feasibility of utilizing a liquid film configuration in MVE applications. In conclusion, the analysis of dielectric and microwave absorption properties offers a robust approach for optimizing the MVE process, facilitating the production of high-quality sugars.
研究领域:
食品科学
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化学工程
·
电磁学
·
工艺优化
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Keyu Yi,Zilin Fan,Qimeng Ran,Kun Jia,Xiaobo Liu,Lei Wang
Flexible surface enhanced Raman spectroscopy (SERS) nanosensors, constructed by integration of plasmonic nanostructures with polymeric substrates, have received increasing research interests for recent decades. When compared to abundant works on optimization of the plasmonic nanostructures, the research involving the influence of polymeric substrates on analytical performance of resultant flexible SESR nanosensors is unexpectedly limited. Herein, the ultra-thin silver layer has been deposited on the electrospun polyurethane (ePU) nanofibrous membranes via vacuum evaporation to prepare the flexible SRES nanosensors. Interestingly, we find that the molecular weight and polydispersion index of synthesized PU play important roles in regulating the fine morphology of electrospun nanofibers , which in turns determine the Raman enhancement of resultant flexible SERS nanosensors. Specifically, the optimized SERS nanosensor, obtained by evaporating 10 nm silver layer on top of nanofibers derived from electrospinning of PU with a weight-average molecular weight of 140,354 and polydispersion index of 1.26, enables label-free detection of the carcinogen of aflatoxin down to 0.1 nM. Thanks to its scalable fabrication and good sensitivity, the current work opens new way for design of cost-effective flexible SERS nanosensors for environmental monitoring and food security applications.
研究领域:
材料科学
·
纳米技术
·
分析化学
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食品安全
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环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Membranes
·
2024
·Vol. 14
·期 5
·106
·
IF 3.3
Yuhang Zhao,Chang Liu,Jianju Deng,Panpan Zhang,Shiyuan Feng,Yu Chen
China is the world’s largest producer and exporter of concentrated apple juice (CAJ). However, traditional concentration methods such as vacuum evaporation (VE) and freeze concentration cause the loss of essential nutrients and heat-sensitive components with high energy consumption. A green and effective technique is thus desired for juice concentration to improve product quality and sustainability. In this study, a hybrid forward osmosis–membrane distillation (FO–MD) process was explored for the concentration of apple juice using sodium lactate (L-NaLa) as a renewable draw solute. As a result, commercial apple juice could be concentrated up to 65 °Brix by the FO process with an average flux of 2.5 L·m−2·h−1. Most of the nutritional and volatile compounds were well retained in this process, while a significant deterioration in product quality was observed in products obtained by VE concentration. It was also found that membrane fouling in the FO concentration process was reversible, and a periodical UP water flush could remove most of the contaminants on the membrane surface to achieve a flux restoration of more than 95%. In addition, the L-NaLa draw solution could be regenerated by a vacuum membrane distillation (VMD) process with an average flux of around 7.87 L∙m−2∙h−1for multiple reuse, which further enhanced the long-term sustainability of the hybrid process.
研究领域:
环境科学
·
食品科学
·
化学工程
·
可持续性
✓ 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）