MINERALS ENGINEERING
·
2020
·
IF 3.795
Pengfei Hu,Long Liang
The heterocoagulation between the valuable and gangue minerals is an important contamination mechanism of flotation concentrate, which is ubiquitous and undesired in flotation. The classical DLVO theory considering the van der Waals and electrostatic double layer interactions is a valid tool for understanding the mechanism of mineral heterocoagulation in aqueous solution. The hydrophobic interaction is also proved to play a role in the heterocoagulation between hydrophobic particles. However, the effect of hydrophobic interaction on mineral heterocoagulation is short of quantitative characterization. This study investigates the heterocoagulation between coal and quartz particles of different hydrophobicity by a quantitative tool named mineral heterocoagulation quantifying system. The results indicated that the heterocoagulation degree steadily increased with the increase of quartz hydrophobicity. The coal of high hydrophobicity (contact angle 90°) possessed a higher heterocoagulation degree with quartz than the coal of moderate hydrophobicity (contact angle 65°). The extended-DLVO theory was applied to calculate the interaction energy between coal and quartz particles. The calculation results indicated that the hydrophobic interaction dominated the heterocoagulation between coal and quartz particles.
研究领域:
矿物加工
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胶体科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xinxin Zhao,Chengcheng Ding,Shuguang Wang,Chao Song
Ageing is the inevitable fate of carbon nanotubes (CNTs) in natural environments. However, the ageing-induced changes in the mobility of CNTs are still poorly understood. In this study, we investigated the migration of CNTs with different ageing degrees in saturated quartz sand using ultrapure water, fresh water and seawater as background solutions. Ageing could change the physicochemical properties of CNTs, leading to less hydrophobicity, lower hydrodynamic diameter, more negative charge and higher dispersity. As a result, aged CNTs exhibited a higher migration ability than pristine CNTs. Furthermore, DLVO theory and XDLVO theory were applied to explore the interaction between CNTs and between CNTs and quartz sand, respectively. Electrostatic repulsion is the primary force, and the total force is also repulsion and increases with ageing, which is favorable for CNTs to migrate in quartz sand. In fresh water and seawater, high ionic strength reduced the electrostatic repulsion, as well as hydrodynamic diameters and negative charges, and thus ageing exhibited a weaker enhancement on CNTs migration than that in ultrapure water. This work is useful to better understand the migration of aged CNTs and is of great significance to reveal the fate of carbon nanomaterials in nature.
研究领域:
环境科学
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Yijiang Li,Xiaoxia Yang,Zhaohua Wang,Wencheng Xia,Feng Wu,Yujin Sun,Xiangyun Sun,Shiqi Liu
This study researched into the underlying influence mechanism of Ca 2+ and Mg 2+ on the rheological properties of kaolinite slurry through rheological technique, turbidity analysis and DLVO theory calculation. The rheological results showed that both the viscosity and yield stress of kaolinite slurry were reduced under high Ca 2+ /Mg 2+ concentration. The apparent viscosity of slurry containing Mg 2+ was lower than that of slurry containing Ca 2+ , but the yield stress of slurry containing Mg 2+ was higher than that of slurry containing Ca 2+ . Turbidity results showed that Ca 2+ have a stronger turbidity removal effect on kaolinite suspension than Mg 2+ . The agglomeration of kaolinite in the presence of Ca 2+ was greater than that in the presence of Mg 2+ . The DLVO theoretical calculation results indicated that there was strong attractive energy between silica face-alumina face, silica face-edge face and edge face-edge face under 1 mmol/L Ca 2+ /Mg 2+ . There were repulsive energy barriers between the silica face-silica face, as well as between the alumina face-alumina face and alumina face-edge face. However, there was an attractive energy between the alumina face-edge face under 1 mmol/L Mg 2+ . The kaolinite agglomeration was a basal face-basal face (F-F) structure with tight and large under 1 mmol/L Ca 2+ , but the kaolinite agglomeration was F-F and edge face-basal face (E-F) structure with loose and large under 1 mmol/L Mg 2+ . The E-F structure in the presence of Mg 2+ caused high yield stress of kaolinite slurry. Under high ions concentration, there was a weak attraction or repulsion between basal faces of kaolinite, but there was an attractive effect between the edge faces. The kaolinite agglomerates were edge face-edge face (E-E) structure with small and even dispersed, resulting in a low viscosity of the slurry. The conclusion of this study provides a basis for regulating the rheological properties of rich-clay slurry during mineral processing.
研究领域:
矿物加工工程
·
胶体化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Shuai Liu,Yue Hu,Jing Xia,Shenwen Fang,Ming Duan
Dual-trap optical tweezers have been used to directly measure the interaction forces between two silica particles upon controlling the concentration of the ionic surfactant sodium dodecylbenzenesulfonate (SDBS). By capturing two silica particles in one spot optical trap and one linear optical trap and controlling the linear trap to bring one particle to approach another sufficiently closer, the interaction forces between these two particles can be measured as the separation distance changes. Results showed that with increasing concentrations of SDBS, the interaction force between the two silica particles emerges at closer surface distance between two silica particles. Only repulsive force exists between silica particles below the critical micelle concentration (cmc) of SDBS and it could be well-fitted using the classical Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. However, the depletion attraction force appears above the cmc of SDBS which is induced by the generation of SDBS micelles. By in situ measurement of the interaction force between two silica particles in the presence of different concentrations of SDBS, the depletion force can be quantitatively calculated.
研究领域:
胶体科学
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界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HYDROLOGY
·
2024
·
IF 5.9
Dan Zhang,Wenke Wang,Zhengyu Zhang,Fengjia Liu,Yufei Ma,Shengke Yang
Knowledge of the transport and fate of nanobubbles (NBs) in groundwater is decisive to assess their remediation scope. In this work, based on the exploration of the stability of NBs in groundwater environmental conditions, the transport behavior and mechanism of NBs under physical (grain size, NBs concentration and flow velocity) and chemical conditions (pH, iron strength (IS) and types and dissolved organic matter (DOM)) were investigated by the column experiment and numerical simulation. The results showed NBs were more stable under alkaline and humic acid (HA) environment. NBs transport increased with the increase of grain size, NBs concentration, pH and HA, respectively. However, NBs transport was inhibited with the increase of acidity, electrolytes and L-Tryptophan (L-Trp) concentration, which was mainly due to these unfavorable factors will lead to an increase in the NBs size and a stronger electrostatic attraction at the interface between NB and sand, resulting in more retention of NBs in porous media. This was demonstrated by the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory and straining calculations. The two–site deposition model showed a better fit. The straining rate (k str ) was greater than attachment rate (k att ), which proved the main retention mechanism of NBs in groundwater was a synergistic mechanism dominated by pore straining and supplemented by attachment (electrostatic attraction and blocking). These findings provided a theoretical basis for the application of NBs technology in groundwater.
研究领域:
环境科学
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水文学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 52
·46270-46277
·
IF 3.289
Wei Shao,Jimin Wu,Hui Liu,Guanghui Dong,Shuxia Wang,Huihua Min,Min Huang
Bacterial adhesion on the surfaces of medical devices, food processing equipment, heat exchangers and ship hulls has been recognized as a widespread problem. Bacterial adhesion on a surface is influenced by surface physical and chemical properties of the surface. In this paper, polyethyleneimine (PEI) grafted graphene oxide (GO) nanosheets were incorporated into Ni–P coatings by an electroless plating technique to modify the surface energy, and therefore to influence the interactions between the prepared surfaces and the tested bacteria. Ni–P–GO coatings were investigated by SEM, AFM, Raman spectrum and XPS. Contact angles of Ni–P–GO coatings with different GO loadings were tested and the surface free energies and their dispersive and polar components were calculated using the van Oss acid–base approach. The results showed that the surface free energies of the coatings had a significant influence on S. aureus adhesion. The Ni–P–GO coatings showed excellent antibacterial adhesion activity. Extended DLVO theory is used to explain the antibacterial adhesion behavior. The novel coatings reported here can be used in controlling bacterial adhesion and biofilm formation for various applications.
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
ENVIRONMENT INTERNATIONAL
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2025
·
IF 9.7
Zheng Zhou,Meng Lu,Yu Huang,Changping Zhao,Yafeng Wang,Marc Pidou,Min Wu,Quan Chen,Paul Jeffrey,Bo Pan
Nano-biochar (NBC) is a promising tool for sustainable remediation of contaminants in aquatic environments. However, the presence of ubiquitous ions and dissolved organic matter (DOM) can impact NBC aggregation, resulting in reduced application efficacy and potential ecological risks. Understanding and regulating NBC aggregation offers valuable insights for its deployment. This study integrated batch aggregation experiments, theoretical models, Fourier transform ion cyclotron resonance-mass spectrometry (FTICR-MS), and density functional theory (DFT) calculations to explore the behaviors and mechanisms of NBC aggregation with coexisting ions and model DOM. NBC aggregation kinetics followed the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory in both NBC-ions and NBC-ions-fulvic acid (FA) solutions, indicating that the aggregation process is controlled by Van der Waals forces and electrostatic repulsion. Mono/di-valent electrolytes promoted NBC aggregation, whereas FA moderated it, with higher molecular weight FA fractions exhibiting superior performance. Three-dimensional excitation-emission (3D-EEM) fluorescence spectra and Parallel factor analysis (PARAFAC) analyses revealed that HA-like substances, followed by FA-like substances, can form a complex with ions, thereby moderating NBC aggregation. FTICR-MS scans identified lignin substances with aromatic structures as key components that effectively reduce the promoted NBC aggregation with coexisting mono/di-valent electrolytes. DFT calculations confirmed that the aromatic structures in FA spontaneously form complexes with electrolytes, thereby potentially regulating NBC aggregation. This research highlights potential strategies for regulating NBC applications and offers insights into the behavior of nanoparticles in aquatic environments.
研究领域:
环境科学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Ruixing Huang,Chengxue Ma,Qiang He,Jun Ma,Caihong Liu,Zhengsong Wu,Xiaoliu Huangfu
The influence of ionic strength on the transport behaviors of natural or engineered colloids has been widely studied in recent years, and the explanatory classical Derjaguin–Landau–Verwey–Overbeek (DLVO) theory has also been employed in many studies. However, ion-specific effects were barely applied to interpret the contradiction between the experimental observations and classical DLVO predictions when nanoparticle or colloidal aggregation and deposition took place in different cationic solutions. In this study, the effects of ionic specificity of the first-group monovalent cations (i.e., Li+, Na+, K+, and Rb+), and the influence of representative polysaccharides (alginate) and proteins (bovine serum albumin (BSA), on the aggregation and deposition behaviors of colloidal manganese dioxide (MnO2) onto silica (SiO2) and iron (Fe3O4) surfaces were systematically studied by employing time-resolved dynamic light scattering (DLS) and a quartz crystal microbalance with dissipation monitoring (QCM-D), respectively. Experimental results indicated that the additive cations with a poorer hydration degree (e.g., Rb+) were more efficient in promoting the aggregation, hindering the deposition kinetics of colloidal MnO2. This could be quantitatively interpreted with the modified DLVO theory, through the introduction of additional short-range repulsion, which was generated from a hydration force between colloids and interfaces. Moreover, BSA was more efficient in hindering the aggregation of colloidal MnO2 than alginate. Furthermore, BSA could enhance the deposition of MnO2 while alginate exhibited the opposite effect. These results revealed the significance of ionic specificity in the aggregation and deposition behaviors of MnO2 colloids and provided insights into understanding the role of counterion hydration in the transport and fate of engineering nanoparticles (ENPs) in an aquatic environment.
研究领域:
环境科学
·
纳米科技
·
胶体化学
✓ 已验证
产品关联
DOI
高影响因子
Data in Brief
·
2019
·
IF 0
Ruichang Zhang,Haibo Zhang,Chen Tu,Yongming Luo
This dataset is related to the research article in Chemosphere, entitled ‘The limited facilitating effect of dissolved organic matter extracted from organic wastes on the transport of titanium dioxide nanoparticles in acidic saturated porous media’ [1]. The data summarised the characterization of dissolved organic matter (DOM) extracted from organic wastes and their effects on the transport of titanium dioxide nanoparticles (TiO 2 NPs) in acidic saturated porous media in the presence of monovalent electrolyte. Three types of dissolved organic matter were extracted from organic materials, including swine manure, sludge, and sediment, using deionized water, and were characterized with UV–Vis, FTIR and elementary analysis. The adsorption of DOM onto TiO 2 NPs was evaluated in the presence of NaCl, and zeta potentials of TiO 2 NPs were also determined. Breakthrough column experiments were conducted to quantify the effects of the extracted DOM on the transport behaviours of TiO 2 NPs in acidic porous media compared with humic acid. Moreover, the interaction energy between nanoparticles and between nanoparticles and quartz media was calculated according to the classical DLVO theory. The dataset could be used as a reference for the evaluation and prediction of the environmental fate and subsequent risk of engineered nanomaterials.
研究领域:
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Han Jia,Daofan Wang,Fengbin Lv,Qiang Wang,Li Lv,Xin Wei,Lin Song,Haidong Jia,Kaihe Lv,Dexin Liu
Both negatively charged SiO 2 nanoparticle and positively charged AlOOH nanoparticle have been widely used in various fields, including enhanced oil recovery (EOR). In this study, the mixed binary AlOOH/SiO 2 nanoparticle (MBN) systems are constructed and firstly employed in EOR. The measurements of zeta potential and Z-average diameter indicate that the stable MBN aqueous dispersion could be obtained by controlling AlOOH/SiO 2 mass ratios, which is quantificationally confirmed via the e-DLVO theory. Then the ternary TX-100-AlOOH-SiO 2 (TX-A-S) system exhibits the great ability to stabilize the emulsion at the much low nanoparticle concentration (0.15 wt% in total). The emulsion stability is further evaluated in the harsh conditions (high shear, temperature and electrolyte concentration). Moreover, core flooding and microscopic visualization experiments reflect the TX-A-S stabilized emulsion can dramatically enhance tertiary oil recovery (~23% of initial oil in place), which should be attributed to the high improvement of both displacement and sweep efficiency.
研究领域:
胶体化学
·
石油工程
·
界面科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Cheng Liu,Xinyue Zhang,Yunfei Zheng,Zijie Ren,Weng Fu,Siyuan Yang
Fluorite is easily affected by the slime coating of fine barite during the froth flotation separation. In this work, the water glass (WG) was utilized as a dispersant to improve the flotation separation performance between fluorite and barite slimes. The single minerals flotation results revealed that barite slimes could be selectively depressed by gelatinized starch (GS), while WG had little effect on the floatability of barite and fluorite using sodium oleate (NaOl) as a collector. The flotation results of artificially mixed minerals showed that the separation efficiency of fluorite from barite was significantly reduced when barite existed as slimes. However, the presence of WG could eliminate the negative effect of barite slimes on the flotation fluorite by using the reagents scheme of GS/NaOl. Zeta potential results indicated that the fluorite surface charge turned from positive to negative with the addition of WG, then the barite slimes coating was detached from the fluorite surface because of the electrostatic repulsion, allowing the cleaning fluorite surface to once again interact with NaOl. The DLVO calculation was also conducted to reveal the agglomerate and disperse of different particles in the flotation system of fluorite-barite slimes.
研究领域:
矿物加工工程
·
浮选化学
·
胶体与界面科学
·
资源综合利用
·
无机非金属材料
✓ 已验证
DOI
高影响因子
Journal of the Iranian Chemical Society
·
2021
·Vol. 18
·期 9
·2231-2239
·
IF 2.019
Li Jiye,Zuo Xinyu,Liu Hao,Xie Yuanyang,Huang Yu
In recent years, aptamer-based gold nanoparticles (AuNPs) colorimetric sensors have received extensive attention, especially in discovery of disease markers and food safety. However, the detection sensitivity is not high enough and the detection results are prone to false positives. Therefore, it is urgently to improve the performance of sensors, ranging from the optimization of sensor detection conditions and establishment of new sensing methods. pH is an important parameter in the solution. In this article, pH was employed to adjust the aptamer charge to increase the sensitivity of lysozyme detection, and the detection limit can be approached as low as 0.05 nM. pH was also used to adjust the target charge to improve the performance of sensors. Chloramphenicol (CAP) and precursors of chloramphenicol (CAP-base) were used as targets to verify the charge effect introduced by pH adjustment. The experiment found that the neutral or electronegativity target would weaken the response of the sensor. To achieve the detection of CAP (electron neutral), a competitive colorimetric sensor had been successfully established to detect CAP. The Derjaguin–Landau–Verwey–Overbeck (DLVO) theory was used to explain the effect of pH on sensor performance. Therefore, by adjusting pH, the detection sensitivity can be improved significantly and a new sensing method can be established, which provide a broad application prospects for chemical, environmental and biological sensing.
研究领域:
生物化学
·
分析化学
·
纳米技术
·
传感技术
✓ 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）