Food Chemistry-X
·
2024
·
IF 6.5
Jinyu Xu,Xiaodan Wang,Xiaoxuan Zhao,Hongyu Cao,Yunna Wang,Ning Xie,Xu Li,Xiaoyang Pang,Jiaping Lv,Shuwen Zhang
The quality issues of ultra-high-temperature (UHT) milk, such as protein hydrolysis and aging gels throughout shelf life, are caused by proteases from psychrophilic bacteria. However, existing enzyme activity detection techniques have low sensitivity and cannot accomplish the detection of product deterioration caused by low enzyme activity. In this study, an attempt was made to analyze the relationship between enzymatically cleaved peptides and product quality using peptidomics techniques. The impact of psychrophilic bacteria proteases on the quality of UHT milk was investigated based on peptidomics by exogenously adding proteases. The results indicated that the protease activity and protein hydrolysis increased significantly in UHT milk over the storage period. Through peptidomic analysis, 2479 peptides were identified, in which 32 proteins linked to the identified peptides. 17 potential marker peptides, including αS 1 -casein 143–156 , β -lactoglobulin 99–108 , and β -casein 39–66 , were screened. The correlation of all identified peptides with protease activity and protein hydrolysis was explored by the weighted gene co-expression network analysis (WGCNA) method. The peptidomics technology helps to study the release or degradation of peptides in UHT milk during storage, which can be applied to monitor the shelf life of UHT milk and predict spoilage.
研究领域:
食品科学
·
微生物学
·
蛋白质组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2012
·
IF 2.003
Rujie He,Ping Hu,Xinghong Zhang,Chen Liu
Complex-shaped ZrB 2 –SiC ultra high temperature ceramic components were successfully fabricated by gelcasting technique and pressureless sintering. When 0.4 wt% poly(acrylic acid) (PAA) was used as dispersant and the pH value was 10, an aqueous ZrB 2 –SiC–B 4 C–C slurry with a high solid loading up to 50 vol% but low viscosity (3.1 Pa s at 60 s −1 ) was prepared. For gelcasting process, the suitable monomers content (AM and MBAM) and the mass ratio of monomers (AM/MBAM) were selected as 3 wt% and 15:1, respectively. After pressureless sintering at 2100 °C for 2 h, ZrB 2 –SiC ceramics (using B 4 C and C as sintering additives) finally achieved about 98% density. Investigation of the mechanical properties revealed a flexural strength of 405±27 MPa and a fracture toughness of 4.3±0.3 MPa m 1/2 . Complex-shaped ZrB 2 –SiC ceramic components with homogeneous microstructure were also successfully produced. This study confirms that gelcasting is a reliable process for the fabricating of complex-shaped ultra high temperature ceramic components with satisfied properties.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
P. Wang,S.S. Zhu,S.P. Zhang,F. Su,J.K. Yuan,Y.J. Jia,Y.Q. Fu,T. Li,Y.L. Zhang,P. Ramasamy,J. Eckert,C.S. Lao,Z.W. Chen
Zr-based ultra-high temperature ceramics (UHTCs) are widely used as the key parts of aircrafts in thermal protection systems. However, such materials usually have a high sintering temperature and it is difficult to obtain complex parts using traditional manufacturing methods. This study reports on the success preparation of complex Zr-based UHTCs by a light-curing 3D printing process. The results indicate that the smaller the precursor particle size, the higher is the viscosity of the slurry used for printing. Slurries with a better curing performance can be prepared by mixing various active diluents and photoinitiators with an optimized certain proportion. The stability of the slurry can be improved by adding coupling agents and dispersants. The main components of the 3D printed green parts are ZrC, SiC and pyrolytic carbon at 1800 °C, yielding a high compressive strength (102 ± 2 MPa) and elastic modulus (65 ± 1 GPa). ZrC/SiC composite ceramic parts with low open porosity (3.99 %) were obtained by 3D printing after heat treatment, which provides an effective way to design complex UHTC parts for extreme environment applications.
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
·
2018
·
IF 3.057
Ping Hu,Yuan Cheng,Peng Wang,Xiang Guo,Chen Ma,Qiang Qu,Xinghong Zhang,Shanyi Du
Inspired by natural exoskeleton composites in arthropods consisting of regularly oriented fibrous chitin within continuous matrices, a novel rolling compacted method was developed to enable controlled orientation of carbon fibers in UHTCs. Using rolling compaction, carbon fibers were arranged in ZrC-SiC matrix along highly consistent direction, in which ceramic powders were uniformly introduced into intrafascicular and interfascicular spaces of fiber bundles. The fabricated C f /ZrC-SiC composite revealed an extendedly graceful fracture pattern and stably impeded crack propagation with a flexural strength and fracture toughness at 227 ± 3 MPa and 5.46 ± 0.14 MPa m 1/2 . An exceptional work of fracture of 3244 ± 76 J/m 2 was achieved, one order of magnitude higher than those of UHTCs, attributed to toughening mechanism of oriented carbon fibers such as fiber pull-out and bridging accompanied by crack deflection and termination. This work provides an easily feasible way to tailor mechanical performance for fiber-reinforced composites through site-specific optimization of fiber orientation .
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wei Xiang,Lin Li,Yunbo Dong,Zizhao Wang,Zifan Song,Mingwei Zhao,Caili Dai
The development of ultra-deep oil reservoirs has posed greater demands on the performance of profile control agents, which composed by hydrophilic polyacrylamide main chain, heterocyclic ring structure and rigid side groups fail to perform decently in temperature beyond 120 °C. In this study, a sulfonated polystyrene microsphere (SPS-2–3) featuring a “rigid hydrophobic core and soft hydrophilic shell” architecture was synthesized through concentrated sulfuric acid sulfonation. At elevated temperatures, the hydrophilic sulfonated layer of SPS-2–3 exhibits increased thickness, alongside enhanced charge quantity and charge mobility. These changes facilitate a more uniform distribution of surface charges on SPS-2–3 and extend the spatial range of electrostatic interactions. Consequently, the fraction of bound water increases significantly from 4.37 % (room temperature) to 26.93 %, electrostatic repulsion between the SPS-2–3 is increased to 4.82 nN, endowing SPS-2–3 with superior dispersion stability under temperature surpassing 160 °C and salinity up to 20 × 10 4 mg·L -1 . The crude oil mobilization characteristics demonstrate that SPS-2–3 effectively enhances the mobilization efficiency of remaining oil in the matrix and achieves a 3.5-fold increase in injection pressure and 20.11 % increase in oil recovery. This study provides a new idea for designing high-performance profile control agents for applications in deep reservoir development.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2015
·
IF 1.416
Hui Mao,Zhengsong Qiu,Zhonghou Shen,Weian Huang
Nano or micro-nano-based materials have attracted a strong interest due to its attractive properties and they have great potential for developing intelligent drilling fluid in petroleum industry. In this article, a novel hydrophobic associated polymer based silica nanoparticles composite with core–shell structure which was mainly used for developing intelligent drilling fluid additive for drilling ultra-deep well under ultra-high temperature, ultra-high pressure and salinity, was prepared with Acrylamide, 2-Acrylamide-2-methylpro pane sulfonic acid, Maleic anhydride, Styrene and silica nanoparticles via inverse micro emulsion polymerization and sol–gel preparation, and was characterized by particle size distribution, SEM, TEM ESEM and the influence law of comprehensive performance of water based drilling fluid and its mechanism influenced by novel hydrophobic associated polymer based silica nanoparticles composite were studied too. Micro-model drilling fluid flooding and drilling fluid displacement experiment of core column were adopted to assess the plugging stability of micro-pores and micro-cracks and effect on wellbore stability. The experimental data showed that, the composite as a micro-nano-drilling fluid additive, possessed excellent properties such as thermal stability, rheology, fluid loss and lubricity. Especially, it could plug the formation effectively and improve the pressure bearing capability of formation significantly.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Sheng Huang,Jian Chen,Zaoyuan Li,Donghua Su,Baowen Zhang,Yuan Gao,Zhiguo Luo
The exploitation of oil and gas resources is progressing towards deeper strata, and the high-temperature environment underground readily gives rise to the difficulty in controlling the fluid loss of cement slurry. An organic/inorganic copolymerized fluid loss additive (FLA) CAF-1 used for ultra-high temperature was synthesized and characterized by Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TG), Nuclear Magnetic Resonance (NMR), Gel Permeation Chromatography (GPC), etc. CAF-1 was composed of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), N, N-dimethyl acrylamide (DMAA), itaconic acid (IA), 4-acryloyl morpholine (ACMO) copolymerized with surface modified nano-silica (KNS). It exhibits excellent thermal-resistance and structure stability within 322°C due to the unique spatial reticulation structure. The fluid loss of oil well cement slurry containing CAF-1 could be controlled less than 50 mL/30 min× 6.9 MPa (1000 psi) at 240°C, even in the semi-saline slurry. CAF-1 could adsorb Ca 2 + and generate more calcium silicate hydrated (C-S-H) by consuming Ca(OH) 2 . The “Pozzolanic Reaction” and “Nucleation Effect" accelerated the hydration of cement slurry. Ultimately, CAF-1 reduced fluid loss at high temperatures by optimizing the spatial structure of the filter cake.
研究领域:
材料科学
·
石油工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zihan Gong,Yifan Li,Jing Chang,Yixin Zhang,Shuai Chen,Qinyin Xu,Liwen Yan
High performance porous ceramics are the crucial thermal-insulation materials for the long-term and reliable service of hypersonic vehicles under extreme conditions. However, the insufficient thermal stability and poor temperature resistance of porous ceramics severely limit its application in extreme high temperature environment. Herein, the ultra-high temperature thermal insulated Ta 4 HfC 5 porous ceramic was prepared via preceramic polymer process combined with gel casting technology. The Ta 4 HfC 5 porous ceramic was composed of Ta 4 HfC 5 nanoparticles with the size of 100-120 nm and enjoyed a lightweight (0.81 g/cm 3 ),a low thermal conductivity (0.1 W/m·K), and superior compressive strength (1.12 MPa). Moreover, the Ta 4 HfC 5 porous ceramic maintained the hierarchical pores after heat treatment at 2000 °C for 1 h, indicating great application potential as the thermal insulation material in extreme conditions.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF DAIRY TECHNOLOGY
·
2025
·Vol. 78
·期 2
·e70015
·
IF 2.8
Yuxin Sun,Hongchao Dai,Wenwen Ge,Dan Xiong,Zhenquan Yang,Zhenbo Xu,Lei Yuan
Foodborne pathogen Bacillus cereus is widely distributed in dairy products and the processing environment. Beyond its threat to human health, the production of thermostable protease also poses a significant challenge to the dairy industry, particularly in pasteurised or ultra-high-temperature (UHT) processed milk products. Despite this, our understanding of dairy spoilage caused by B. cereus is very limited. This study aimed to evaluate the spoilage potential of a thermostable protease produced by B. cereus 12–1 in fluid milk. Specifically, crude protease characterisation, including optimum pH and temperature, the influence of Ca 2+ on enzyme activity and heat stability of protease, was studied. Moreover, the effects of this protease on the quality of both whole and skim UHT milk were evaluated, including zeta potential and particle size of milk, hydrolysis of milk protein, release of free amino acids and change of milk microstructure. This crude protease has relatively good stability at wide-ranging pH values from 5.0 to 10.0 (79.67–166.67 U/mL) and temperatures from 20°C to 70°C (92.67–165 U/mL), and maintained stability of 46.04% and 38.31% after heat treatment by 65°C/30 min or 100°C/10 min. Spoilage patterns in skim and whole UHT milk differ significantly due to variations in fat content. The protease caused protein hydrolysis in whole milk (15.25%) and skim milk (17.09%), effectively hydrolysed κ-casein and β-casein, caused the release of free amino acids (Lys, Val, Tyr, Phe, Ile, Met and Leu) in UHT milk and significantly increased particle size (increase by 940 nm for skim milk and 1319 nm for whole milk), and reduced zeta potential (reduction by 4 mV for skim milk and 3.83 mV for whole milk) of UHT milk. Results indicate the spoilage potential of crude protease from B. cereus and highlight the need to prevent dairy spoilage caused by B. cereus .
研究领域:
食品科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Hang Zhang,Miaomiao Hu,Yun Cheng,Xiaohua Li,Xinyang Zhang,Yujie Ying,Jie Cao,Xiujian Xia,Shusen Zhang,Zhanfu Wei,Jintang Guo
This work proposed an ultra-high temperature set-regulation method to provide a reference scheme for the optimal retarder design of ultra-deep formation oil well cementing slurry. It was found that there was a synergistic retarding effect between 2-acrylamido-2-methylpropanesulfonic acid-based copolymer retarder and 1-hydroxyethylidene-1,1-diphosphonic acid, and the latter could serve as an intensifier for the former to significantly prolong the ultra-high temperature (≥200 ℃) thickening time of cement slurry. The thickening progress mechanism of cement slurry was studied from the perspective of hydration kinetics and mineral content evolution. Results indicated that the content of cement hydration products during the thickening process did not increase gradually and linearly, but increased rapidly within several minutes near thickening time due to the acceleration of hydration. The introduction of intensifier 1-hydroxyethylidene-1,1-diphosphonic acid extended the thickening time by highly delaying the hydration of silicate minerals (C 3 S/C 2 S), while less affected the hydration of aluminate minerals (C 4 AF/C 3 A). Furthermore, the synergistic principle between copolymer retarder and 1-hydroxyethylidene-1,1-diphosphonic acid was proposed from microchemical perspective. Analysis showed that the PO 3 2- was a stronger anchoring group than -COO - and could compensate for the decline of Ca 2+ chelating ability of copolymer retarder caused by decarboxylation and thermal oxidative degradation in ultra-high temperature and alkaline environment, thus further delaying the hydration.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
Open Ceramics
·
2021
·
IF 0
Milad Kermani,Danyang Zhu,Jiang Li,Jinghua Wu,Yong Lin,Zhiquan Dai,Chunfeng Hu,Salvatore Grasso
Pressure-less consolidation of transparent alumina requires several hours dwelling at high temperature (1600 °C) under a strongly reducing atmosphere (hydrogen). Here, we report on the ultrafast consolidation of translucent alumina ceramics at 1360 °C. Transparency was promoted by synergistic effects of high initial green density (62.7%) and rapid sintering using Ultra-fast High-temperature Sintering (UHS) technique. The proposed approach, using a heating rate of 430 °C/min and dwelling time of 15 min, resulted in ultra-fine-grained translucent alumina ceramics with a grain size of 0.39 μm, and an in-line transmittance of 28.7% at a wavelength of 700 nm. For comparison, conventionally fired counterparts were opaque due to their incomplete densification and pore coalescence.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Ke Xu,Fuchuan Liu,Cunchuan Zheng,Jianlin Lai,Jingnan Ge,Yang Shi,Yang Li,Tianyi Wang
In this work, based on theory and experiment the fracturing fluid additives are developed, including thickener , crosslinker, pH regulator and temperature stabilizer . The effect of additives on the performance of fracturing fluid was investigated with the temperature and shear resistance as the evaluation index. A synergistic strategy for constructing ultra-high temperature fracturing fluid was obtained. The main content of this strategy is ' main + auxiliary ', the correct choice of the main agent combined with an auxiliary agent to form a temperature-resistant fracturing fluid system. The main agent is thickener and crosslinker, pH regulator and temperature stabilizer are auxiliary agents. Two ultra-high temperature fracturing fluid systems are obtained by the strategy, which meets the requirements of temperature and shear resistance at 200 °C, 100 s −1 and 240 °C, 100 s −1 , respectively. More importantly, the temperature resistance mechanism of fracturing fluid is analyzed at the micro and macro levels, based on chemical reaction, rheology, and microstructure information. This study is helpful for us to understand the selection and function of fracturing fluid additives. The developed fracturing fluid is expected to be used in the fracturing stimulation of unconventional reservoirs.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）