ChemCatChem
·
2018
·Vol. 11
·期 3
·1057-1063
·
IF 4.674
Gan Wang,Lijuan Zhang,Baolin Yan,Jianmin Luo,Xintai Su,Fan Yue
Graphical It's a vacancy-rich world ! During the liquid-nitrogen quenching process, the isolated O atoms on the TiO 2 surface are partially frozen and lose the opportunity to return the crystallographic sites, leaving abundant oxygen vacancy on the surface. The oxygen vacancy-rich TiO 2 prepared via liquid-nitrogen quenching exhibited outstanding advantages on photocatalytic H 2 evolution. Development of novel methods to obtain highly active catalysts for photocatalytic hydrogen evolution is desired. This work reports a facile preannealing-quenching strategy to synthesize oxygen vacancy-rich anatase TiO 2 hollow spheres. TiO 2 hollow spheres are first synthesized via a versatile kinetics-controlled coating method and then subjected to high temperature preannealing followed by rapid quenching in liquid-nitrogen (−196 °C). The as-quenched samples appear light grey suggesting the presence of abundant surface oxygen vacancies, which are subsequently confirmed by the comprehensive analyses of XRD, XPS and EPR spectra. The oxygen vacancies induced by quenching process are proved to have promoted the light adsorption and inhibited the recombination of photo-induced charges for TiO 2 hollow spheres, which obviously improve the photocatalytic performance of those samples. The results showed that the TiO 2 hollow spheres quenched at 500 °C exhibited a robust stability and the most excellent photocatalytic performance for hydrogen evolution (413.5 μmol h −1 ) over other quenched samples and it displayed 1.51 times higher performance than that of samples normally cooled at 500 °C (273.7 μmol h −1 ). Herein, this liquid-nitrogen quenching strategy presented here provides an effective route for the synthesis of high-performance TiO 2 for water splitting and have a promising prospect in the other application.
研究领域:
材料科学
·
催化
·
纳米技术
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
Animals
·
2025
·Vol. 15
·期 5
·698
·
IF 2.7
Xi Shi,Jiayin Xu,Yujie Hou,Zhen Wei,Lufang Guo,Xiao Ma,Limin Wu,Wenge Ma,Xue Tian,Khor Waiho,Xuejun Li
Simple SummaryThe sperm characteristics are various among fish species, which leads to different methods of sperm preservation for specific species. The sperm preservation technique for Qihe crucian carp, one of the major economic aquacultural fish species in China, has not been reported previously. This study aimed to construct the method of sperm preservation for Qihe crucian carp. The results showed that Hank’s Balanced Salt Solution (HBSS) was the best extender solution, and 15% MeOH and 20% DMSO were the optimal cryopreservation solutions for low-temperature storage and liquid nitrogen preservation, respectively. Further, under current conditions, an ultra-freezer (−80 °C) could not replace liquid nitrogen for sperm cryopreservation in Qihe crucian carp. This is the first study to investigate the preservation of Qihe crucian carp sperm, which will provide valuable technical support for both genetic resource conservation and artificial breeding programs.Qihe crucian carpCarassius auratusis one of the major economic aquacultural fish species in China. Due to environmental degradation and the impact of the reproduction mode of gynogenesis, the wild population of Qihe crucian carp exhibits an extremely low proportion of males. Therefore, it is imperative to develop the sperm preservation technology for Qihe crucian carp. In this study, the indicators, including sperm motility, sperm movement time, and sperm lifetime, were applied to evaluate the preservation effects of various extenders, cryoprotectant types and concentrations, and preservation manners, thus establishing the techniques of sperm short-term storage and cryopreservation for Qihe crucian carp. The results showed that HBSS was the most suitable extender solution, in which the sperm motility reached 93.00%. Under room temperature (26 °C), the sperm motility showed no significant differences across six different cryopreservation solutions. Under low temperature (4 °C), a 15% MeOH solution presented the most effective preservation effects of sperm in the short-term low-temperature storage. For cryopreservation in liquid nitrogen, the sperm activity in 20% DMSO was significantly higher than that in other solutions, representing the optimal cryopreservation solution. Furthermore, it was found that the sperm activity preserved by liquid nitrogen was significantly higher than that preserved by the ultra-freezer (−80 °C), indicating that the ultra-freezer cannot substitute for liquid nitrogen in cryopreservation. This is the first study to investigate the preservation of Qihe crucian carp sperm, providing valuable technical support for both genetic resource conservation and artificial breeding programs.
研究领域:
水产养殖学
·
生殖生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF FOOD PROCESSING AND PRESERVATION
·
2020
·Vol. 45
·期 2
·e15139
·
IF 1.405
Yue-ming Hu,Nan-hai Zhang,Hui Wang,Yi-fan Yang,Zong-cai Tu
Pengze crucian carp was pre-frozen by liquid nitrogen and freezer, and then stored at −20/−40°C and −20°C, respectively, for 15–60 days. Effects of pre-freezing methods and storage temperatures on the qualities of fish were investigated. The pH showed a “V” trend. The soluble myofibrillar protein content, hardness, springiness, cohesiveness, gumminess, chewiness, and resilience decreased. Thiobarbituric acid value, total volatile basic-nitrogen value, thawing and cooking loss rates increased with the extending of storage period. LF-NMR analysis indicated that the water-protein connection became less tight. Moreover the qualities decline degrees were higher for freezer pre-frozen than liquid nitrogen pre-frozen, and higher for −20°C storage than −40°C storage. Accordingly, compared with conventional freezer pre-freezing and storage, liquid nitrogen pre-freezing and low temperature storage could inhibit the oxidation and degradation, and keep better water holding and textural properties of muscle. The present study showed a great potential application in aquatic products processing industry. Practical applications In aquatic product enterprise, liquid nitrogen can be used to pre-freeze fishes in seconds. And combined with low temperature storage, the oxidation and degradation of fish can be significantly inhibited. In addition, water holding capacity and textural properties of fish muscle can be better kept, and the shelf-life of fish can be extended by several weekends in comparison with those of fishes pre-frozen and stored in freezer.
研究领域:
食品科学
·
水产加工
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Yue Hu,Xing Peng,Zhihui Ai,Falong Jia,Lizhi Zhang
In this study, we report that liquid nitrogen treatment is a promising zero-valent iron activation method that does not remove the iron oxide shell; this can improve the apparent Cr(VI) removal rate constant of zero-valent iron by about 4–120 times, depending on the particle sizes and the suppliers of zero-valent iron. It was found that liquid nitrogen, with its low temperature of 77 K, could crack the iron oxide shell of zero-valent iron to produce abundant fractures because of the different thermal expansion coefficients of iron oxide and iron. These fractures provided suitable mass transfer channels for the inward transfer of water/oxygen molecules to the iron core and the subsequent in situ generation of Fe(II) for the reduction of Cr(VI) to Cr(III). More importantly, systematic characterizations confirmed the generation of an Fe(III)/Cr(III)/Cr(VI) composite on the surface of zero-valent iron during the removal, suggesting its environmental benignancy. This study provides a novel physical zero-valent iron activation method, sheds light on the importance of the iron oxide shell of zero-valent iron on Cr(VI) removal, and clarifies the intrinsic Cr(VI) removal mechanism of zero-valent iron.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2025
·
IF 5.8
Yuxiao Mao,Hosahalli S. Ramaswamy,Junde Ren,Hongyue Li,Tao Song,Ting Xiao,Sinan Zhang,Yong Yu,Songming Zhu
To develop a model food for the large yellow croaker (LYC, Larimichthys crocea ) muscle subjected to liquid nitrogen spray freezing (LNSF), the effects of temperature and concentrations of gelatin (5%, 10%, and 15%, w/w), sodium chloride (0%, 3%, 6%, and 9%), and sucrose (0%, 3%, 6%, and 9%) on thermal properties of frozen gelatin gels were investigated. Thermal conductivity ( k ) and diffusivity ( α ) significantly decreased ( P < 0.05) with increasing gelatin concentration and decreasing sodium chloride content. Adding sucrose significantly decreased k but raised α . Increasing the concentrations of all three components reduced the volumetric heat capacity ( C pV ). The gelatin gel with 16% gelatin and 4% sucrose was selected as the model food because its thermal properties most closely matched those of LYC muscle. At depths of 5, 15, and 25 mm, the total LNSF freezing durations for gels (164.78, 167.01, and 167.40 min) were similar to those for fish muscles (167.67, 169.47, and 168.93 min), validating that the developed model food effectively simulated the freezing characteristics of real food. The significant decrease in cross-sectional area from 1538.63 to 850.90 μm 2 and area uniformity index from 2.507 to 1.612 with decreasing freezing temperature from -20 to -100 °C demonstrated that rapid freezing generated uniformly distributed fine ice crystals. This phenomenon indicated that the model food could simulate the quality changes in fish muscle with LNSF freezing temperature. In summary, adjusting the component content of gelatin gels can be used to develop model foods for aquatic products to optimize LNSF freezing protocols.
研究领域:
食品科学
·
生物物理学
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Xuefeng Zhang,Xudong Liu,Shangli Dong,Jianqun Yang,Yong Liu
MXene is a promising material for supercapacitor due to its unique physical and chemical properties. However, traditional fabrication methods of electrode often result in restacking of MXenes nanosheets, leading to the insufficient utilization of electrochemical performance. Therefore, it is a great challenge in actual applications for us to improving the restacking of electrode materials by designing optimum electrode structures. Herein, we reported a fabrication of 3D macroporous MXenes film (3d-Ti 3 C 2 T x -film) and aerogel by liquid nitrogen rapid freezing. The specific area increased by 5 and 22 times compared with the Ti 3 C 2 T x -film (prepared by vacuum filtered and dried in air). The huge specific surface area enhances double-layer capacitance and provides more surface active sites. The specific capacitance of 3d-Ti 3 C 2 T x -film and aerogel is 372 F g −1 (1355 F cm −3 ) and 404 F g −1 (1293 F cm −3 ) at a current density of 1 A g −1 in a 3 M H 2 SO 4 electrolyte, respectively. Moreover, the supercapacitor fabricated with 3d-Ti 3 C 2 T x -film displays an outstanding volumetric energy density of 32.2 Wh L −1 at the power density of 946 W L −1 . The fabrication method by liquid nitrogen rapid freezing is more environmental friendly, simpler and lower cost compared to the template method. Furthermore, the 3D macroporous MXene is expected to be applied in the fields of ion battery, seawater purification and photocatalysis.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chao Wang,Wei Wang,Wenxin Guo,Dongxuan Guo,Jinlong Li,Xue Yang,Shanshan Fu,Dong-Feng Chai,Guozhe Sui,Yue Li
In this work, the lattice tensile strain of nitrogen/fluorine co-doping ferroferric oxide (Fe 3 O 4 ) nanocubes assembled on chrysanthemum tea-derived porous carbon is induced through a novel liquid nitrogen quenching treatment (named as TS-NF-FO/PC X -Y, TS: Tensile strain, NF: Nitrogen/Fluorine co-doping, FO: Fe 3 O 4 , PC: Porous carbon, X: The weight ratio of KOH/carbon, Y: The adding amount of porous carbon). Besides, the electrocatalytic activity influenced by the adding amount of porous carbon, the type of dopant, and the introduction of lattice tensile strain is systematically studied and explored. The interconnected porous carbon could improve electrical conductivity and prevent Fe 3 O 4 nanocubes from aggregating. The induced nitrogen/fluorine could cause extrinsic defects and tailor the intrinsic electron state of the host materials. Lattice tensile strain could tailor the surface electronic structure of Fe 3 O 4 via changing the dispersion of surface atoms and their bond lengths. Impressively, the designed TS-NF-FO/PC 5 -0.25 delivers a low overpotential of 207.3 ± 0.4 mV at 10 mA/cm 2 and demonstrates desirable reaction dynamics. Density functional theory calculations illustrate that the electron structure and hydrogen adsorption free energy (ΔG *H ) are optimized by the synergistic effect among porous carbon, nitrogen/fluorine co-doping and lattice tensile strain, thus promoting hydrogen evolution reaction (HER) catalytic activity. Overall, this work paves the way to unravel the enhancement mechanism of HER on transition metal oxide-based materials by electronic structure and phase composition modulation strategy.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 2
·331-340
·
IF 2.496
Zheng Tao,Li Meisheng,Zhou Shouyong,Zhao Yijiang,Zhong Zhaoxiang,Chen Chenglung
Two-dimensional (2D) graphitic carbon nitride (g-C 3 N 4 ) nanosheets are widely used in photocatalysis, energy storage and membrane separation owing to their high specific surface area, rapid photogenic carrier migration rate and numerous active sites. In this study, high performance g-C 3 N 4 nanosheets with a particle size of about 290 nm were prepared by gas exfoliation. It was observed that the structure and properties of g-C 3 N 4 nanosheets prepared at 500 °C were superior as compared to 300 °C and 400 °C. The state of g-C 3 N 4 layers at different temperatures was also studied by molecular dynamics simulation. It was revealed that the liquid nitrogen (L-N 2 ) molecules could only penetrate the edge space between g-C 3 N 4 layers at 500 °C, however, no penetration took place in the layers. The traditional gas exfoliation mechanisms were observed to be incapable in explaining this phenomenon. Combining the experimental studies and molecular dynamics simulations, a novel gas exfoliation mechanism was proposed in this study so as to prepare few-layered g-C 3 N 4 nanosheets. Based on this, the L-N 2 molecules entered the edge space in g-C 3 N 4 layers and subsequently pushed deeper to exfoliate the nanosheets.
研究领域:
材料科学
·
催化化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2022
·Vol. 7
·期 10
·2101740
·
IF 8.856
Lianjia Zhao,Xiyao Fu,Hao Xu,Yiqiang Zheng,Wei Han,Lili Wang
Temperature is a basic physical quantity that is essential to life and productivity. However, continuously and efficiently monitoring a full range of temperatures remains a serious challenge. Herein, a full-range (−20 to 100 °C) flexible temperature sensor is designed using Ti 3 C 2 T x MXene as an active conductive skeleton and sodium alginate hydrogel as a heat-sensitive coating layer. The sensor exhibits accurate and stable temperature response across the entire range, with a sensitivity of up to 3244% °C −1 . Moreover, it not only dynamically detects liquid nitrogen, but also effectively senses gradually approaching objects within a certain range. Lastly, a temperature monitoring system based on the sensor realizes the perfect monitoring of a cold-storage model. This work will inject new vitality into the development of temperature sensors.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2025
·
IF 8
Yuxiao Mao,Hosahalli S. Ramaswamy,Hongyue Li,Mingyun Dai,Tao Song,Ting Xiao,Junde Ren,Yiqing Zhang,Yong Yu,Songming Zhu
Liquid nitrogen spray freezing (LNSF, −20, −60, and − 100 °C) was adopted to evaluate the effect of four cubic sample (with side lengths of 25, 50, 75, and 100 mm) volumes on the freezing curves, microstructure, texture, and gel strength of gelatin gels (16 % with 4 % sucrose, w /w), serving as a food model, along the depth in gels. The total freezing time significantly increased ( P < 0.05) with increasing freezing temperature and depth, leading to larger ice crystals and more severe damage to the gel network. The gel strength significantly decreased from 3480 g at a depth of 5 mm to 2570 g at 25 mm for 50 3 mm 3 gels frozen at −100 °C. An increase in sample volume resulted in prolonged freezing times at all depths, thereby increasing the cross-sectional area of ice crystals at the center from 851 to 1800 μm 2 as the cubic gel volume increased from 50 3 to 100 3 mm 3 . Scanning electron microscopy (SEM) observations revealed densely packed irregular pores with thin membranes at the centers of larger samples as compared to small and regular pores at the surface, indicating more severe structural damage. Rapid LNSF for the smallest sample might lead to a high internal stress, causing an unexpected fracture of the gel network. Results showed that the overall strength of gels was reduced by the increased sample volume. It was recommended to appropriately decrease the freezing rate for the product surface during the early freezing stage to prevent the formation of a consolidated inelastic layer and reduce the internal stress.
研究领域:
食品科学
·
低温工程
·
材料科学
·
生物医学工程
·
食品加工技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2019
·
IF 2.584
Feng Shen,Shuang Sun,Jirui Yang,Mo Qiu,Xinhua Qi
A key problem in the conversion of cellulose into chemicals and fuels is the low product yield from cellulose due to its robust structure. In this work, for the first time, cellulose was pretreated with coupling of liquid nitrogen and ball milling (LN–BM) for cellulose hydrolysis. After the LN–BM treatment, the glucose yield from cellulose by HCl in water increased by almost 2 times and yield of formic acid catalyzed by H2SO4–NaVO3 was more than 3-fold that obtained from untreated cellulose. The yields were also much higher than that from the individually ball-milled cellulose. The structure variation of cellulose indicated that reduction of both crystallinity index and molecular weight contributed to improving the conversion efficiency, but the former was the dominant factor. The combination of liquid nitrogen and ball milling developed in this work is an effective and environment-friendly approach for cellulose pretreatment.
研究领域:
化学工程
·
生物化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANIMAL FEED SCIENCE AND TECHNOLOGY
·
2021
·
IF 3.247
Jian Gao,Bingbing Cheng,Yufeng Liu,Meng M. Li,Guangyong Zhao
Two consecutive experiments were conducted to investigate the effects of dietary supplementation with red cabbage extract (RCE) rich in anthocyanins on the nitrogen (N) metabolism in beef bulls and the nitrous oxide (N 2 O) emissions from the soil applied with the urine of beef bulls. In Experiment 1, 8 Simmental beef bulls (body weight 387.9 ± 40.7 kg) were used as experimental animals . Two levels of RCE, i.e. 0 and 114 g dry matter per day, were supplemented to a basal ration as experimental treatments. The animals and the treatments were allocated in a 2 × 2 crossover design. In Experiment 2, the static incubation technique was used to determine the N 2 O-N emissions from the soil applied with the urine samples collected from Experiment 1. The results of Experiment 1 indicated that RCE supplementation did not affect the N excretion, N retention, and N retention rate in beef bulls ( P > 0.10). However, RCE supplementation increased the ratio of hippuric acid-N/urinary N ( P < 0.05) and tended to increase the ratio of creatinine-N/urinary N ( P = 0.081) without changing the excretion of other urinary nitrogenous components ( P > 0.10). Plasma metabolome analysis indicated that RCE supplementation upregulated 12 metabolites while downregulated 18 metabolites ( P < 0.05). The results of Experiment 2 indicated that RCE supplementation reduced the estimated urine N 2 O-N emissions by 33.1% through decreasing the ratio of N 2 O-N/urine-N ( P < 0.05). In conclusion, RCE supplementation did not affect the N retention and N excretion of beef bulls, whereas it attenuated the urine N 2 O-N emissions of beef bulls through increasing urinary hippuric acid excretions.
研究领域:
动物科学
·
环境科学
·
营养学
✓ 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）