APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Yongbing Yuan,Hongling Chen
The chemical modification of calcined kaolinite particle surface via stepwise method using 3-glycidoxypropyltrimethoxysilane (GPS) and dodecylamine was investigated. Silylation of kaolinite particles was controlled by varying the amount of GPS under almost anhydrous condition. FT-IR and thermal analysis indicated that silylation monolayer coverage on kaolinite particle surface increased with the increasing of the amount of additive GPS, reaching a maximum value of 8.81 μmol/m 2 when the mass ratio of kaolinite to GPS was up to 1:1. Further modification of the silylated kaolinite particle surfaces was accomplished using the modifier synthesized by the ring-open reaction of GPS and dodecylamine to form multilayer branches at the presence of H 2 O (pH = 12). The final modified kaolinite particle surfaces contained both hydrophobic long alkyl chains and hydrophilic groups, which were advantageous to homogeneous dispersion in low polar as well as polar solvents, respectively. Digital photographs and TEM images revealed that the final modified kaolinite particles were homogeneously dispersed in acetone, dioxane, ethanol, and THF, even better than raw kaolinite dispersed in ethanol. Meanwhile, the dispersion properties in low polar solvents such as xylene, cyclohexane and petroleum ether were also acceptable, and the aggregate particle size was near to primary particle size of raw kaolinite, or just a bit larger, increasing from 1.25 to 1.75–2.00 μm.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Wenbao Liu,Wengang Liu,Shujuan Dai,Ting Yang,Zhen Li,Ping Fang
Magnesite ore powder is the primary raw material used to prepare refractory magnesia. With the depletion of high-grade magnesite, methods to reduce the impurities and improve the quality of magnesite ore powder are urgently required. In this study, an ethanolamine-based surfactant, bis (2-hydroxyethyl) dodecylamine (BHDA), was first introduced into the flotation of magnesite ore as a novel collector, and the possibility of improving the purity of the ore was investigated by experiment and theory. Flotation tests, X-ray photoelectron spectroscopy, Fourier-transform-IR spectroscopy, and zeta potential measurements were carried out to study the behaviors and mechanisms by which the collector enhances the purity of magnesite ore powder. The flotation results revealed the noticeable difference in the floatability of quartz, magnesite, and dolomite when combined with the collector over a wide range of pulp pH values (4.18–9.17). The analytical results obtained from FTIR spectra, XPS, and zeta potential measurements indicate that BHDA was readily adsorbed on the surface of quartz, mainly by electrostatic and hydrogen bonding interactions, whereas it was adsorbed on the surfaces of magnesite and dolomite by weak electrostatic interactions. By introducing a hydroxyethyl group to the tertiary amine collector, more hydrogen bonds can form with the surface of quartz, strengthening the adsorption stability. Thus, compared to the traditional collector, dodecylamine, BHDA showed better desilication and purification performance for magnesite ore powder. Meanwhile, our results show that the simpler reagent system and process flow makes BHDA promising for the industrial purification of magnesite ore powder.
研究领域:
矿物加工工程
·
材料科学与工程
·
化学工程与技术
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2017
·
IF 2.942
Liang Shen,Jinbo Zhu,Lingyun Liu,Huaifa Wang
In order to improve the flotation recovery of fine kaolinite , mixed dodecylamine chloride/fatty acid was used as collector in kaolinite flotation process. The performance of dodecylamine chloride/fatty acid mixture collector on kaolinite flotation was investigated using flotation test and computational method. Surface tension measurement, contact angle measurement and image analysis were also used to study the flotation behavior of dodecylamine chloride and mixture collectors. The flotation results showed that much higher kaolinite flotation recovery was obtained in the presence of dodecylamine chloride/octanoic acid mixture compared with that in the presence of dodecylamine chloride alone. Surface tension measurements indicated that the mixed dodecylamine chloride/octanoic acid collector was more efficient at decreasing the air–water interfacial tension. Molecular dynamics simulation showed that the octanoic acid molecules were interleaved among dodecylamine chloride ions and co-adsorbed at the kaolinite (001) surface. The relative concentration of water molecules near kaolinite (001) surface further decreased in the presence of dodecylamine chloride/octanoic acid compared with that in the presence of dodecylamine chloride alone, which indicated a much stronger hydrophobicity of the kaolinite (001) surface.
研究领域:
矿物加工工程
·
表面化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Xiangning Bu,Geoffrey Evans,Guangyuan Xie,Yaoli Peng,Zungan Zhang,Chao Ni,Linhan Ge
Coal-series kaolin (CSK) in Xuzhou, Jiangsu Province of Eastern China was characterized by chemical analyses, X-ray diffraction (XRD) and zeta potential measurement as well as by scanning electron microscope equipped with an energy dispersive spectrometer (SEM-EDS). The authigenic ultrafine quartz grains ( d 90 = 15.8 μm) closely associated with this CSK sample was the major impurity mineral, which cannot be separated from kaolin by screening and size classification process. This work investigated the separation of fine quartz from kaolin by flotation. Single mineral flotation tests indicated that effective separation of quartz from kaolin was possible with acidic pH value (pH = 3), depressant of starch and collector of dodecyl amine (DDA). Rougher flotation tests of coal-series kaolin revealed that the SiO 2 /Al 2 O 3 weight ratio of the concentrate was qualified for industrial applications in the presence of 160 g/t starch and 100 g/t DDA, at acidic pH pulp. A specially designed two-stage cleaner flotation flowsheet increased the concentrate recovery from 37.26% to 46.55% compared to a rougher flotation process.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Zhenhao Guan,Ying Zhang,Runpeng Liao,Jian Liu,Qicheng Feng,Shuming Wen
The present study investigated the interaction mechanism between α-nitroso-β-naphthol (αNβN) and smithsonite, and analyzed its performance in the dodecylamine (DDA) collector system. The results showed that at pH 8.0 and 10 mg/L DDA, the flotation recovery of smithsonite increased significantly from 19.64 % to 81.81 % after activation with 5 mg/L αNβN. In the DDA collector system, αNβN underwent chemical adsorption onto the smithsonite surface, which enhanced the hydrophobicity and zeta potential of the activated smithsonite. Density functional theory (DFT) and molecular dynamics (MD) simulation results confirmed that αNβN chemically adsorbed onto Zn sites on smithsonite via its nitroso group (R-N=O), reducing the water molecules concentration on the hydration film of smithsonite, and significantly enhancing the adsorption efficiency of DDA. This study demonstrated the superior performance of the novel activator in smithsonite flotation, providing a theoretical foundation for effectively replacing traditional sodium sulfide. This innovation not only improves flotation efficiency but also significantly reduces the negative impact on the environment.
研究领域:
矿物浮选
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化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Xueming Yin,Jin Yao,Bin Yang,Wanzhong Yin,Wenbo Li,Jiayi Liu
Actinolite is often associated with hematite and tends to form fine-grained particles during grinding, which makes the recovery and separation of hematite through flotation challenging. This study innovatively used polyethylene oxide (PEO) as a flocculant and, in a reverse flotation system with dodecylamine (DDA) as the collector, increased the recovery rate of actinolite by 40.59 %, the desilication rate of the binary artificial mixed ore by 25.23 %, and that of the ternary artificial mixed ore by 4.62 %. The study also investigated the effect of PEO on the structure of actinolite during flocculation and the relationship between the structure of actinolite flocs and their floatability. Laser particle size and turbidity tests indicated that PEO significantly increased the particle size of fine actinolite, causing it to aggregate into flocs while reducing its settling velocity and apparent density. Optical microscopy and scanning electron microscopy observations revealed that the low density of the flocs was due to PEO flocculating fine actinolite into porous and irregular spherical shapes with high surface roughness and specific surface area. Energy dispersive spectroscopy analysis and wrapping angle analysis demonstrated that the flocs have a large specific surface area, apparent volume, and are subject to greater buoyancy, making them more likely to attach onto the surface of bubbles and be carried by them. Therefore, PEO can be used as a flocculant for the flotation of actinolite, increasing the floatability of fine-grained actinolite and thereby enhancing the flotation removal rate of actinolite in hematite. The mechanism of fine-grained actinolite flocculation enhancing reverse flotation desilication of hematite.
研究领域:
矿物加工
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浮选技术
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表面化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Geoenergy Science and Engineering
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2023
·
IF 0
Xuening Feng,Shi Liu,Hanjun Liu,Xuebin Jiang,Weiyang Wang,Ying Yang,Liwei Shen,Zejun Zhang,Fan Ye,Yuanzhu Mi
A demulsifier (PEDA) with double hydrophobic chain structure was synthesized using polyethylene glycol diglycidyl ether (PEDGE) and dodecyl amine (DA) as starting materials by a one-step method. The PEDA was characterized by FT-IR, 1 H NMR and thermogravimetric analysis (TGA). It was used for the demulsification of two water-in-crude oil (W/O) emulsions (m water :m oil = 70:30 and m water :m oil = 10:90). The effect of PEDA concentration, settling time, demulisification temperature, pH value and salinity on the demulsifying efficiency (DE) were detailly discussed in the W/O emulsions. The results showed that the DE of PEDA could reach 91.78% and 100% in the 70:30 and 10:90 emulsion at 50 °C for 240 min, respectively. Also, PEDA had excellent acid, alkaline and salt resistance. In addition, some commercial demulsifiers were used for comparison to evaluate the demulsification ability of PEDA. The dynamic interfacial tension (IFT), three-phase contact angle (CA), zeta potential and optical microscopic observation were used to investigate the demulsifying mechanism. The current study not only develops a new PEDA demulsifier with excellent performance at lower temperature but also provides a simple synthesis method for the demulsifier using less variety of raw materials, so it is more conducive to the industrial applications.
研究领域:
化学工程
·
石油工程
✓ 已验证
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lingfeng Shen,Ning Sun,Rui Xu,Wei Sun,Li Wang
In this paper, the flotation separation of quartz and feldspar was studied with CaCl 2 as activators and mixed sodium oleate/ dodecylamine (NaOL/DDA) collectors under alkaline condition, and the action mechanism of mixed NaOL/DDA collectors on the quartz and feldspar surfaces were systematically explored. The results of micro-flotation test showed that there were 90.98% quartz and 13.08% feldspar were floated with 0.5 mmol/L CaCl 2 and 2.8 mmol/L mixed NaOL/DDA collectors with molar ratio of 8/1 at pH 10.0. And the artificial mixed minerals flotation manifested these two minerals were able to efficient separation with CaCl 2 and mixed NaOL/DDA collectors at pH 10 ∼ 11. These outcomes indicated that DDA could increase recovery of quartz obviously and reduce about a half dosage of NaOL (from 0.5 mmol/L to 0.25 mmol/L) in flotation under alkaline condition; Meanwhile, mixed NaOL/DDA collectors were able to decreased the flotation separation pH from 12 to 10 on quartz and feldspar. Infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results revealed that when NaOL collector was added alone, it could adsorb on activated quartz surface but hardly detected on feldspar surface at pH 10. However, they all were found on both quartz and felspar surface when mixed NaOL/DDA collectors were introduced as collectors. Quartz microcrystal balance with dissipation (QCM-D) experiment confirmed that mixed NaOL/DDA collectors showed a higher adsorption mass and more stable adsorption layer on quartz compared with NaOL was introduced as collector alone. In addition, whether CaCl 2 , NaOL or mixed NaOL/DDA, the adsorption mass on quartz sensor were larger than that on feldspar senor, which might cause difference of hydrophobicity on the surface of quartz and feldspar in flotation. The above experiments showed that the mixed NaOL/DDA collectors can significantly improve hydrophobic difference between quartz and feldspar after activating with CaCl 2 and expand the floated pH range of quartz compared with using NaOL as collector alone, which were efficient reagents to separate quartz and feldspar in flotation.
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
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Qing Chen,Jinyue Dai,Peizhan Cao,Guangming Lu,Xiaoqing Liu
Building benzoxazine coatings on large equipment is of great practical importance and challenging. In this work, a main-chain type benzoxazine (MCBZ) resin that can be quickly shaped under UV light was successfully synthesized and can be directly coated into a film. In addition, it had a wide processing window, low curing temperature, excellent static antifouling effect, and sterilization effect. The d12-DHBP-MCBZ resin was prepared from dodecamine, which ensured the sterilization effect, and 4, 4′-dihydroxy-benzophenone provided the photoinitiation sites and activated the oxazine ring. By adjusting the ratio of d12-DHBP-MCBZ to TMPTMA, hydrophilic benzoxazine coatings can be prepared, suitable for fouling-resisting coatings. The results indicated that the d12-DHBP-MCBZ resin could be quickly shaped under UV light, and the post-curing temperature was only 140 °C. In particular, the coatings' excellent hydrophilicity can effectively prevent fouling organisms' adhesion and improve the static antifouling effect. It was worth mentioning that Poly (BZ/20 %TMA) coating achieved a high sterilization performance of >99 %. These works gave us a new strategy to solve application problems of benzoxazine coatings on large equipment and antifouling coating efficiency problems.
研究领域:
材料科学
·
海洋生物学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Shiwei Wang,Longfei Tang,Xiuxiang Tao
In this paper, effect of surfactants on the hydrophobicity of low rank coal particles by sliding time measurements was investigated. X-ray photoelectron spectrometer (XPS) analysis indicated that the surfaces of low rank coal particle consisted of many hydrophilic functional groups. It was observed that the sliding time of low rank coal particles in 2-ethyl hexanol solution was the shortest than that of low rank coal particles in dodecyl amine hydrochloride (DAH) and sodium dodecyle sulfate (SDS) solutions. Moreover, the maximum touching angle (θ T ) of low rank coal particles observed in 10 −2 mol/L of 2-ethyl hexanol solution was about 80°, which was the greatest than that of low rank coal particles, about 39° in 10 −3 mol/L of DAH and 35° in 10 −4 mol/L of SDS solutions, respectively. Therefore, the sliding time results indicated that the hydrophobicity of low rank coal was enhanced by 2-ethyl hexanol and DAH and reduced by SDS. However, it was noted that the hydrophobicity of low rank coal was depressed when the DAH concentration increased to 10 −2 mol/L. The flotation performances were consistent with the results of sliding time measurements. Therefore, effect of surfactants on the hydrophobicity of low rank coal particles can be characterized by sliding time measurements.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2019
·
IF 1.573
Junli Wang,Yajie Qiao,Tingting Wang,Kangmin Chen
In this work, we combine the catalytic growth and ligand control mechanisms to synthesize ultrathin/ultralong ZnSe nanowires (NWs). Ag 2 Se catalyst seeds initiate the NW growth and significantly cause the increase of the NW lengths up to several micrometers. The long-chain amine mixture of oleylamine and 1-dodecylamine acts as reaction medium and ligands (or surfactants) to control the sizes of Ag 2 Se seeds and ZnSe NWs within several nanometers (the mean diameter of NWs: ∼5.5 nm). The microstructure studies by HRTEM reveal the presence of zinc blende (ZB)/wurtzite (W) alternations and a number of stacking faults and twins within individual ZnSe ultrathin NWs. These NWs exhibit optical quantum confinement effect due to the diameters smaller than the theoretical exciton Bohr diameter of bulk ZnSe. Raman spectrum and photoelectronic performance under white light illumination are also presented.
研究领域:
材料科学
·
纳米技术
·
光学
·
固体物理
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 30
·期 3
·859-868
·
IF 1.637
Cheng Lingping,Cai Jianfeng,Ke Yanxiong
Core–shell particles (CSPs), also known as superficially porous particles or fused-core particles, consisting of a solid core and a porous shell, have emerged as an advanced technology in high-performance liquid chromatography (HPLC). We report here an ultrasonic-assisted sol–gel method for the fabrication of CSPs with uniform mesoporous silica shell using tetraethoxysilane as the silica source and dodecylamine as a catalyst, template and porogen agent in a methanol–water solution. Instead of stirring, sonication was adopted to guarantee the particles monodispersity and uniformity. The shell thickness between 300 and 700 nm could be obtained by adjusting the sonication time and the volume ratio of methanol–water. Pore sizes from 3.4 to 8.5 nm were tuned by hydrothermal treatment. The C18-bonded 2.7 μm CSPs with a shell thickness of ~ 500 nm showed some advantages over a commercial 1.7 μm BEH column, and successfully applied for the analyses of a Chinese medicine and peptides. The CSPs could be a promising candidate as HPLC packing materials.
研究领域:
分析化学
·
材料科学
·
纳米技术
·
药物分析
✓ 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）