FOOD HYDROCOLLOIDS
·
2019
·
IF 5.839
Yue Wei,Zhixiang Cai,Min Wu,Yalong Guo,Ran Tao,Ruiqi Li,Pengguang Wang,Aiqin Ma,Hongbin Zhang
The utilization of pea protein as an alternative to animal proteins for the production protein fortified foods and beverage products has recently gained tremendous interest due to the quality and health benefits associated with pea proteins. However, its use in food systems is often limited by technical issues such as the stability of pea protein dispersions (PPD). The objective of this study was to improve the physical stability of PPD by using corn fiber gum (CFG), high-methoxy pectin (HMP), carboxymethyl cellulose (CMC), and konjac glucomannan (KGM). The stabilization mechanism of PPD by these four different polysaccharides was investigated at native pH (roughly 5.5–7.5) and acidified pH (ca. 3.5) using particle size, zeta potential , rheological and physical stability evaluations. All four polysaccharides effectively improved the stability of PPD at various levels, but the physical stability of PPD was highly dependent on the type and concentration of the polysaccharides as well as the pH. Electrostatic repulsion, steric hindrance and the high viscosity of continuous phase were the main contributions to the improvement in PPD stability. Overall, these results have significant implications for the development of protein-based beverages with improved physical stability. The findings derived from this research can provide valuable information that may increase the utilization of pea protein in the food industry.
研究领域:
食品科学
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生物化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MINERAL PROCESSING
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2017
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IF 1.561
Cheng Zhang,Cheng Liu,Qiming Feng,Yanfei Chen
Utilization of N -carboxymethyl chitosan (N-CMCh) to limit the detrimental effect of serpentine on the flotation of pyrite is presented in this work. Flotation results show that the presence of hydrophilic serpentine slimes results in lower recoveries of the valuable pyrite. Utilization of N -carboxymethyl chitosan can limit the detrimental effect of serpentine on the flotation of pyrite. Zeta potential measurements illustrate that N-CMCh is with negative charge and the electrostatic interaction between serpentine and N-CMCh is occurred at pH 8.5, then the serpentine zeta potential will be changed from positive to negative, the electro-steric attraction converts into electro-steric repulsion between pyrite and serpentine and the pyrite recovery is improved.
研究领域:
矿物加工工程
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材料化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 48
·105247-105258
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IF 5.8
Chen Yuzhen,Tan Yan,Su Lezhu,Zou Wangqi,Wu Binhai,Gao Wenbin,Hu Zhan,Li Aoxuan,Zhou Zhi,Zhou Nan
At present, studies on biochar transport have focused on biochar obtained by oxygen-limited pyrolysis, which may differ from conventional biochar produced by incineration in nature. This work investigated the transport and retention mechanisms of three types of oxygen-limited pyrolytic biochar and three types of traditional biochar in saturated porous media. The results showed that the specific surface area of the three oxygen-limited pyrolysis biochar (180–200 m 2 ·g −1 ) was higher than that of the traditional biochar (50–60 m 2 ·g −1 ). Therefore, the retention capacity of pyrolytic biochar is strong and the permeability is less than 0.1. The absolute value of the zeta potential of traditional biochar is greater than 30 mV, and the electrostatic repulsion generated is stronger, with a peak penetration rate of 0.16. Moreover, the zeta potential of biochar and traditional biochar is regulated by pH value and ionic strength. In acidic conditions or solutions with high ionic strength, the zeta potentials of the six types of biochar changed to about − 15 mV, and the second minimum value was less than 0, indicating that there was a tendency for sedimentation. This study provides a new perspective for assessing the transport and environmental risks of biochar in the environment.
研究领域:
环境科学
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土壤学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL DENTAL JOURNAL
·
2023
·
IF 3.3
Mrs Wenjing Jin,Master's degree students Haiyan Wu
Aim or Purpose To systematically investigate the role of HA on collagen fibril intrafibrillar mineralization and the possible mechanism. Materials and Methods HA(Mw=5000-150000) was purchased from Aladdin company. We applied stochasticoptical reconstruction microscope (STORM) and transmission electron microscopy (TEM) to investigate the intrafibrillar mineralization of collagen fibrils. The characteristics and Ca2+ adsorption capacity of collagen was analyzed via solid surface zeta potential and inductively coupled plasma mass spectrometry. The mineralization rate of bare collagen (BC) and collagen pretreated 1.2 mg/ml HA(HA-BC) was studied by monitoring the pH changes in mineralization solution. Results The mineralization degree of BC and HA-BC was 4.26±0.11% and 55.27±2.13%, respectively, indicating HA can significantly promote collagen intrafibrillar mineralization. STORM images clearly showed the spatial relationship of minerals present in the collagen fibrils. The collagen potential after HA modification was significantly reduced from -36.86 ± 2.26 mV to -85.90 ± 1.34 mV. Chemical analysis results show that the Ca2+ adsorption of collagen is increased significantly from 16.13 ± 1.65 mg L-1 to 22.32 ± 0.51 mg L-1 after HA modification. Time-dependent pH changes showed that the induction time in HA-BC group is 2.25 ± 0.33 h, shorter than BC group (3.09 ± 0.14 h), which implies that HA is a crystallization accelerator. Conclusions These results confirm that HA as NCPs surrogates on intrafibrillar mineralization of collagen by reducing surface ζ potential, which facilitate attracting more Ca2+, thus providing more nucleation sites to promote ACP transformation to HAP. This project was funded by National Natural Science Foundation of China (22207097) to Wenjing Jin.
研究领域:
生物材料学
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骨生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Zhiqiang Wu,Jianhua Chen,Xiaoqin Tang,Ye Chen
Hemimorphite, as a most common Zn–O mineral, is an important source of zinc resources. Oleic acid direct flotation method is effective to recover hemimorphite. However, strong hydration of hemimorphite leads to flotation difficulties, the mechanism of hemimorphite hydration remains unclear. In this study, two hydrated surface models were established through the adsorption of H + ions and –OH groups on hemimorphite surfaces to investigate the influence of hydration on direct flotation of hemimorphite using micro-flotation tests, zeta potential analysis, FTIR measurements and DFT calculations. Experimental results show that pH severely affects direct flotation of hemimorphite. At pH < 9, the surface adsorbs H + ions; at pH > 9, –OH groups are adsorbed on the surface, leading to a rapid decrease in zeta potential. DFT results show that H adsorption shifts Zn 4s orbitals towards the Fermi energy level and leads to hemimorphite surface layer being in an electron-deficient state, promoting the stable sp 3 hybridization of oleic acid (OA) with Zn atoms to form outer-orbital complexes. However, –OH adsorption increases the steric hindrance of Zn atoms and causes an electron-enrichment state of hemimorphite surface layer, hindering the OA-Zn interaction. The study provides new insights into the mechanism of hemimorphite hydration and helps to achieve interface regulation for direct flotation of hemimorphite.
研究领域:
矿物加工
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表面化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Meiling Fan,Chunhong Nie,Huan Du,Jiawen Ni,Baohui Wang,Xirui Wang
Facing increasing challenges to oil field production and energy utilization, tertiary oil recovery technologies, exemplified by alkali-surfactant-polymer (ASP) flooding, can significantly improve the oil recovery. However, it has produced an enormous amount of highly emulsified water to increase the tough water treatment in the oilfield. Currently, the dominated treatments have been focused on the traditional treatment methods, such as the thermal demulsification, electric demulsification and gas flotation demulsification. These technologies have high energy consumption and low efficiency, which blocks their wide applications in engineering. In this paper, we first performed a solar-driven sustainable demulsification by adopting the highly emulsified water produced from ASP flooding in the oilfield. The solar energy has three-fold effects, i.e. the photo, thermo and electrochemical action, on the demulsification. The solar thermal and electrochemical process serves as controlling domains for the thermo-aided electrochemical oxidation and separation to break the organic surfactants and polymers in the O/W interface. For an insight into solar demulsification, we monitored the variation of the viscosity, zeta potential, particle size, rheology and percent removal of the highly emulsified water in the real time. The results show the achievements of the solar O/W demulsification and separation via the five measurable parameters dominated by three solar based fields. The viscosity of the highly emulsified emulsion was decreased from 1.41 mPa s to 1.0 mPa s. The negative zeta potential was increased, which means that the repulsive electrostatic force among oil droplets was reduced. The viscoelasticity of the O/W interface was decreased, so the strength of the interface film was decreased. By monitoring the variation of the oil droplet size and distribution, it can be concluded that the mechanism of solar demulsification is a process in which the oil droplets conduct to continuously flocculate and coalesce, finally creaming or sedimentation. The percent removal reached 82.84% at a 60 °C temperature under the condition of 7 V potential driven by the light radiation. Further characterizations show that solar energy has a great effect on treating highly emulsified water produced from oilfields with low energy consumption and environmental protection.
研究领域:
环境科学
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化学工程
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石油工程
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产品关联
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Yiquan Guo,Yongchun Zhao,Shaolong Wang,Cheng Jiang,Junying Zhang
Fly ash fine particles emitted from flue gas during coal combustion are the primary atmospheric pollutants in China. The purpose of this study was to investigate the characteristics of the zeta potential of fine particle suspensions. The relationship between the zeta potential and the fine particle removal efficiency was also discussed. Batch experiments were conducted to evaluate the zeta potential of fine particle aqueous solutions under various pH, ion concentration, surfactant, polymer, and chemical agglomeration solution conditions. A chemical agglomeration system was designed to simulate the removal process of the fine particles. The test results indicated that the zeta potential absolute value of the solution decreased initially and then increased as the pH increased. As the pH increased from 4 to 12, the zeta potential decreased from Zp = 9.4 mV to Zp = −45.4 mV. The isoelectric point (IEP) was 4.3. Also at the IEP, the highest fine particle removal efficiency of 25.9% was achieved. The zeta potential increased as the metal cation concentration of the solutions increased. The trivalent cation Al 3+ exhibited the best performance, which increased Zp from −32.1 mV to −11.2 mV and produced the highest fine particle removal efficiency of 9.2%. Polymers significantly impacted the zeta potential. As the concentration of kappa-carrageenan (CAR) increased from 0.01% to 5%, the zeta potential increased from −30.1 mV to 12.6 mV. The highest fine particle removal efficiency of 41.8% was acquired at a concentration of 0.5%, which had the lowest zeta potential absolute value of 3.5 mV. It can be inferred that the increase in the zeta potential induced the growth of the energy barrier, which prevented particle agglomeration. The suspension with a lower zeta potential exhibited a better fine particle removal efficiency.
研究领域:
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Hui Jia,Fangfang Feng,Jie Wang,Huu-Hao Ngo,Wenshan Guo,Hongwei Zhang
The hollow fiber ultrafiltration (UF) membrane has been widely applied in the water treatment industry, however, the membrane fouling is the core reason and limiting factor in terms of its industrial application. In the constant flux process, hollow fiber membranes (HFM) non-uniform fouling varies along the axis direction, which is the basic mechanism of HFM fouling. In this paper, the local membrane fouling behaviors and verities are investigated using electrical impedance (EI) and zeta potential (ZP) to capture the feedback signals of membrane fouling behaviors. The results are then, integrated with Hermia's model and an equivalent circuit model. As the fitting results show, both the EI and ZP can be employed as indicators of different membrane fouling states. This work defines the different stages of membrane fouling depending on the alternating relationship between EI and ZP in the membrane filtration process. Furthermore, the behavior of cake layer compaction is defined from the perspective of the membrane fouling mechanism. Therefore, this study provides an effective means for accurate identification of membrane fouling behavior. In addition, the EI and ZP exhibit great potential to identify the fouling distributions and proceedings in HFM fouling. Doing so successfully confirms that the characteristics of non-uniform fouling of HFM are reflected in the spatiotemporal difference of the fouling process.
研究领域:
环境科学
·
水处理工程
·
膜技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Wenjun Liu,Ken Liu,Ling Zhu,Wenyan Li,Kun Liu,Wei Wen,Mingxian Liu,Hong Li,Changren Zhou,Binghong Luo
The liquid crystalline and rheological properties of chitin whiskers (CHWs) are significant for their application in fabrication of highly ordered composite materials and optical components. The aim of this work was to elucidate the influence of chemical structure and chargeability (zeta potential, electropositivity, electronegativity or zwitterionic character) on the liquid crystalline and rheological properties of CHWs. Firstly, CHWs with different chemical structure, including positively charged whiskers (CHWs and CHWs-D/60 min) and negatively charged whiskers (mCHWs), were designed via acid hydrolysis , deacetylation , and maleation, respectively. Subsequently, the chargeability of the above whiskers was further regulated by protonation or deprotonation . The whisker aqueous suspensions with high zeta potential behaved as nematic liquid crystals or chiral nematic liquid crystals, whereas those with low zeta potential had no liquid crystal characteristics. The viscosity, G', and G" values of the CHWs and CHWs-D/60 min aqueous suspensions treated with protonation were lower than those of the corresponding whiskers treated with deprotonation. However, the mCHWs exhibited different changes in their rheological properties under protonation or deprotonation due to the electronegativity and zwitterionic characteristics. In addition, the effects of ionic strength and pH on the liquid crystalline and rheological properties of CHWs, CHWs-D/60 min, and mCHWs aqueous suspensions varied since the chemical structure and chargeability of whiskers differ.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
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2015
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IF 2.489
Huan Zhou,Shiqin Kong,Sarit B. Bhaduri,Linhong Deng
Calcium phosphates with negative zeta potential belong to a type of materials favoring apatite nucleation, bone regeneration, as well as osseointegration. Unfortunately, there are limited options to produce such materials. The present work demonstrates a simple but versatile method to prepare calcium phosphates with negative zeta potential using sodium calcium polyphosphate as a precursor. The resulting products can be hydroxyapatite , calcium pyrophosphate or monetite, depending on the relevant experimental conditions. Both hydroxyapatite and calcium pyrophosphate were composed of nanoparticles . However, the as-prepared monetite was micro-plates with nanoporous surface structures. Such calcium phosphates may have great potential in bone tissue engineering applications.
研究领域:
生物材料学
·
骨组织工程
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2019
·
IF 2.923
Shanshan Dai,Peiyao Zhu,Yuxin Suo,Hongsheng Lu
A series of water-soluble tertiary amines (TAs) are introduced into an oil-in-water (O/W) emulsion stabilized by sodium oleate (NaOA). TAs convert into bicarbonate salts upon bubbling of CO2, which could induce the increase of ionic strength of the aqueous phase, form ion pairs with NaOA by electrostatic interaction, and finally result in demulsification. ζ-Potential, conductivity, pH value, 1H NMR, separation rate, and interfacial tension are applied to figure out the effects of number of tertiary amine groups and different positions of the hydroxyl group. TA with an increasing number of tertiary amine groups can further stabilize the O/W emulsion and accelerate the process of demulsification by bubbling CO2. More tertiary amine groups bring about a more stable emulsion and faster demulsification by bubbling CO2. The position of the hydroxyl group is a key factor affecting the solubility of the corresponding ion pair formed with NaOA. The better the water solubility, the slower the demulsification. The worse the water solubility of the ion pair, the more perfect the demulsification is. More importantly, water-soluble TA, with proper structure, could bring about perfect demulsification.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Yuankai Xu,Zhitao Yuan,Qingyou Meng,Xuan Zhao,Yusheng Du
The mixed BHA/NaOL collector was studied to improve the floatability of ilmenite in the presence of lead ions. The mechanism was discussed through surface tension measurements, zeta potential measurements, adsorption amount measurements, and XPS analysis. Microflotation results show that the mixed BHA/NaOL collector exhibited a better performance on the floatability of ilmenite than single BHA and NaOL collector. The recovery of ilmenite was 92.9% when the molar ratio of BHA/NaOL was set to 7:3. The adsorption amount of mixed collectors on the ilmenite surface was greater than that of equivalent single BHA and NaOL. The results of surface tension suggest that there was synergism between BHA and NaOL in aqueous solution. Zeta potential results indicate that mixed BHA/NaOL adsorbed onto ilmenite surface and had a more negative shift than single BHA. XPS results further confirm that BHA and NaOL adsorbed onto the ilmenite surface through chemisorption and hydrogen bonds.
研究领域:
矿物加工
·
表面化学
·
材料科学
✓ 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）