Nature Communications
·
2018
·Vol. 9
·期 1
·1-8
·
IF 12.353
Pan Xiao-Feng,Gao Huai-Ling,Lu Yang,Wu Chun-Yan,Wu Ya-Dong,Wang Xiang-Ying,Pan Zhi-Qiang,Dong Liang,Song Yong-Hong,Cong Huai-Ping,Yu Shu-Hong
Biomimetic assembly of high-quality nanosheets into nacre-like structures can produce macroscopic films with favorable mechanical and optical performances due to the intrinsic properties and high level of ordering of the nanoscale building blocks. Natural ground mica is abundant and exhibits great application potential. However, large size and low aspect ratio greatly limit its biomimetic assembly. Moreover, exfoliation of ground mica into high-quality nanosheets remains a significant challenge. Here, we report that large-scale exfoliation of ground mica into mono- or few-layered mica nanosheets with a production rate of ~1.0 g h − 1 can be successfully achieved. The mica nanosheets are then assembled into strong biomimetic polymeric mica film that inherits the high electric insulation, excellent visible transmittance, and unique ultraviolet-shielding properties of natural mica. Its overall performance is superior to that of natural sheet mica and other biomimetic films, making the polymeric mica film a suitable substrate for flexible and transparent devices.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Hanyu Wu,Jie Chen,Zengbo Su,Bin Ma,Yizhe Ji,Shuhan Lin,Dingfang Xu,Mingliang Kang
Europium(III), i.e., Eu(III), is chemically analogous to the trivalent lanthanides (Ln) and actinides (An). A good understanding of the adsorption behaviour of Eu(III) on mica group minerals is critical to the safety evaluation of the radioactive contamination. Nevertheless, the structural complexity of micaceous minerals makes it difficult to draw a consistent conclusion in the study of Eu(III) migration. In this work, we contrastively studied Eu(III) adsorption on dioctahedral muscovite and trioctahedral phlogopite as functions of pH, ionic strength, background electrolytes, interaction sequence, and fulvic acid (FA). Batch experiments showed that Eu(III) adsorption on both micas was strongly dependent on pH but quite independent on ionic strength that is determined by Na + . Planar sites are available on both muscovite and phlogopite while interlayer sites only on phlogopite under Na + and Ca 2+ electrolytes (not for K + and Cs + ). An interlayer expansion of phlogopite, as indicated by a newly appeared diffraction peak at ~6° 2-theta, occurred along with Eu(III) adsorption, which was also confirmed by transmission electron microscopy . Furthermore, the initial Eu(III) concentrations, the concentration ratios between Eu(III) and Cs + , and the reaction sequences of Eu(III)-electrolytes-FA affected both the adsorption behaviour of Eu(III) and reversely the structural alteration of phlogopite. The sequential extraction showed that the adsorbed Eu(III) was mainly in the ion-exchangeable form while the addition of FA could increase the portion of coordinative species. The currently proposed Eu(III) adsorption mechanism can shed new light on predicting the migration of Ln/An(III) at the mica-rich solid-liquid interface on a molecular scale.
研究领域:
环境科学
·
放射化学
·
矿物学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Shuo Liu,Fangxu Li
In order to overcome the limitations of fatty amines (FAS) and reduce consumption and costs, this study developed a high-efficiency flotation system that FAS with methyl isobutyl methanol (MIBC). Single mineral flotation results showed that MIBC enhanced the collecting ability of decamine (DCA), dodecylamine (DDA), tetradecylamine (TDA), and hexadecylamine (HCA) while reducing their dosage. At pH 3, recoveries for DCA, DDA, TDA, and HCA were 63.22 ± 1.34 %, 86.284 ± 4.33 %, 72.30 ± 3.34 %, and 40.02 ± 2.27 %, respectively. With MIBC added, these increased to 89.43 ± 1.87 %, 89.58 ± 2.66 %, 73.38 ± 4.27 %, and 79.60 ± 2.23 %. Batch flotation experiments also demonstrated that lepidolite recovery by DDA and HCA rose from 96.64 % and 36.47–96.70 % and 98.29 %, respectively. Surface tension and viscosity detection revealed that the addition of MIBC to FAS resulted in a decrease in surface tension and an increase in solution viscosity. The adsorption, zeta potential, contact angle and foaming property tests indicated that MIBC can enhanced the recovery of lepidolite by adjusting the adsorption densities of DCA and DDA, as well as modifying the bubble properties of TDA and HDA in the flotation pulp. These findings highlighted the critical role of bubble properties in lepidolite flotation systems, going beyond mere hydrophobicity effects.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2022
·Vol. 12
·期 9
·1068
·
IF 2.818
Yangshuai Qiu,Zhenfei Mao,Kangkang Sun,Lingyan Zhang,Yupeng Qian,Tao Lei,Wenbo Liang,Yaxin An
Flotation is one of the most used methods to upgrade natural graphite resources. However, the efficiency is usually decreased due to the entrainment of undesirable fine gangue minerals. In this work, the impact of different factors such as particle size, pulp density, and flotation reagent on the entrainment of mica and quartz in a flake graphite flotation was studied. The single gangue mineral flotation results showed increased gangue entrainment when reducing the particle size of gangue minerals and increasing the pulp density. Moreover, the flotation of artificial mixtures indicated enhanced entrainment of mica and quartz in the presence of graphite particles. The collector and frother also strongly affect gangue entrainment by modifying the structure and stability of the froth. Kerosene, which has a prominent deforming feature, can reduce gangue entrainment more effectively than diesel.Keywords:entrainment;froth flotation;quartz;mica;flake graphite
研究领域:
矿物加工
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2023
·Vol. 13
·期 4
·457
·
IF 2.5
Chenyu Fan,Liuyi Ren,Yimin Zhang,Shenxu Bao,Zhilu Yang
In this paper, different doses of sodium hexametaphosphate (SHMP) were added as grinding aids in the process of muscovite grinding, and the effect of SHMP on the grinding efficiency of muscovite was studied. The grinding experiment results show that the grinding efficiency increases significantly with the increase in SHMP dosage. The mechanism of SHMP improving the grinding efficiency of muscovite was analyzed by various test methods. Experimental results showed that when SHMP was used as a grinding aid, the ordered structure of muscovite crystals was destroyed, the surface of muscovite was roughened, and obvious cracks appeared. SHMP was physically adsorbed on the muscovite powder, which effectively improved the pulp environment of muscovite powder during grinding, resulting in more dispersed muscovite powder, and improved the grinding efficiency. This study provides theoretical guidance for the efficient preparation of fine-grained muscovite powder and the action mechanism of grinding aids.Keywords:grinding aids;muscovite;sodium hexametaphosphate;pulp dispersibility
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chao Wang,Min Chen,Huimin Hu,Junwei Huang,Ting Jiang,Lei Peng,Qing Shi,Qiwu Zhang
The deep treatment of monovalent thallium (Tl + ) and the study of Tl + incorporation mechanism are of great value for water safety. However, current research objectives have focused on how to oxidize or precipitate Tl + , while neglecting to investigate the underlying mechanisms of the direct immobilization and stable storage state of Tl + . Therefore, the present study examines in detail how Tl + is directly incorporated and stably stored by silicate minerals. In this study, an idea is proposed to enhance the purification of Tl-containing wastewater by using mechanically activated mica to stabilize Tl + in the silicate structure in the form of lattice residue state. Elucidation of the removal mechanism was first performed with focus on Tl + exchange with interlayer K + and H(H 2 O) + inside the silicate mineral based on the quantitative data and a series of characterizations such as XRD, XPS, FTIR, SEM-EDS and TG. As adsorbents for Tl-containing wastewater, both activated phlogopite and biotite for the purification of target wastewater demonstrated excellent performances at a dose of 2 g/L and a reaction time of 240 min, reaching quantitatively down to 23.88 μg/L and nearly 0 μg/L respectively, from an initial Tl + concentration of 1203 μg/L, so that the effluent concentrations would meet the requirements of US EPA and Chinese discharge standards for industrial wastewater and drinking water. In addition, density functional theory (DFT) calculation was used to quantify the adsorption energy of Tl + being solidified in the interlayer structure to further give insight into the mechanism of Tl + immobilization by silicate mineral.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 86
·83163-83174
·
IF 3.289
Hailin Mo,Genlin Wang,Fei Liu,Pingkai Jiang
Achieving a better interface between epoxy and mica particles is the key issue to realize desirable thermal conductivity and low dielectric loss in epoxy-based dielectric materials. In this paper, we report two strategies to improve the interface between synthetic mica and epoxy resin. Polymer coated mica and organically modified mica were prepared by coating polydopamine (PDA) films and grafting a silane coupling agent (KH 560) and fluoro-chemicals via self-polymerization and in situ grafting. The thermal conductivity, dielectric loss and mechanical properties of the epoxy/functionalized mica dielectric materials were markedly improved in comparison with that of the epoxy/mica dielectric materials. The results suggests that the mechanical and dielectric properties of the epoxy/functionalized mica dielectric materials both depended on a good interface and good adhesion between mica and the epoxy matrix. The thermal conductivity of the epoxy/functionalized mica dielectric materials results from a balance of interfacial thermal resistance and quality of the interface. The better overall performance of the epoxy/mica@PDA and mica@PDA@F dielectric materials is attributed to the better interface between mica and epoxy matrix, and provided a new route for preparing epoxy-based dielectric materials with high thermal conductivity and low dielectric loss for use in electronics and the electrical industry.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
CLAYS AND CLAY MINERALS
·
2022
·Vol. 70
·期 4
·566-579
·
IF 2.207
Zeng Li,Peng Tongjiang,Sun Hongjuan,Zhang Xiyue,Yang Jingjie
Powder-type semiconductor photocatalysts are widely applicable but their defects (e.g. easy agglomeration during preparation and recyclability in the suspension system) limit their practical application. In the current study, perovskite oxide photocatalytic material was loaded onto a muscovite substrate to overcome the problems of low stability, easy agglomeration, and difficult recovery. A photocatalytically active LaNi 0.95 Fe 0.05 O 3 /muscovite composite material was synthesized by a sol-gel impregnation method. Phase composition, morphology, and interfacial interaction of the composites, denoted as LNFBY- x ( x : mass ratio of LNF to muscovite), were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and other analytical methods. According to the results, the particle size of LNF nanoparticles was regulated effectively by compounding with muscovite, and the agglomeration of LNF decreased. LNF nanoparticles were distributed evenly and attached in dense fashion to the surface of muscovite, thereby increasing the contact area with the reaction medium. The nanoparticles were connected to the silicon-oxygen tetrahedral sheet of the muscovite via Si–O–La, Si–O–Ni, and Si–O–Fe bonds, which increased the bonding strength between the composite components and expedited the transfer of photogenerated charge. More highly active oxygen species were produced, and a growing number of chemically active moieties (٠O 2 - and ٠OH) was generated in the photocatalytic reaction. LNFBY-1.00 demonstrated the best photocatalytic activity. A degradation rate of methyl orange of 99.03% was achieved after visible-light irradiation for 120 min, which decreased to 75.75% after five repeated uses, thereby indicating high stability and recycling ability. The photocatalytic LaNi 0.95 Fe 0.05 O 3 /muscovite composite material exhibited potential for application in environmental remediation practices.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 42
·e53034
·
IF 3.057
Yu Feng,Ziyuan He,Zhijie Yang,Wenxin Tang,Qingguo Chi,Qingguo Chen
The bottleneck problem of the development of high-voltage motors to a larger capacity can be solved if the thermal conductivity is improved without sacrificing the insulation characteristics of the main insulation material. In this paper, a spraying technology based on electrospinning is proposed that can evenly spray boron nitride (BN) with high thermal conductivity onto the surface of mica tape. With the increase in BN content, the insulation and thermal conductivity of mica tape are optimized to varying degrees. When the BN content reaches 2.25 wt%, the in-plane conductivity increases from 1.6 to 2.7 w/(m K), while the out-of-plane conductivity increases from 0.17 to 0.26 w/(m K). Additionally, the direct-current (DC) breakdown strength has increased from 90.6 to 96.9 kV/mm and the dielectric constant and dielectric loss are almost unchanged. Finally, through simulation verification, if the modified mica tape is applied to the main insulation of a synchronous motor, the operating temperature of the motor insulation will be reduced from 73.5 to 66.1°C. This study provides a new research idea for the preparation of high thermal conductivity insulating materials.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
CLAYS AND CLAY MINERALS
·
2023
·
IF 2.2
Weng Ming,Wang Xiuhua
Muscovite has been used increasingly as a substrate in flexible electronics and fillers in high-performance nanocomposites. Muscovite-based interfacial interactions play a crucial rule in material fabrication. Hansen solubility parameters (HSPs) have proven useful in characterizing molecular interactions within/between condensed phases. The present study aimed to determine the HSPs of raw muscovite (RM) and to investigate solvent dispersion mechanisms of RM. To achieve this, the solubilities of RM in 17 solvents were evaluated by dispersion tests, and the HSPs of RM were calculated as the center of the optimal solubility rotated-ellipsoid in HSP space, which included all good solvents, had the smallest number of outliers, and had the smallest volume. The resulting dispersion, polar, and hydrogen bonding components of RM were 18.301, 2.366, and 3.727 MPa 1/2 , respectively. By considering the HSPs and Kamlet-Taft's solvatochromic parameters of solvents, we concluded that the low polarity of RM is due to hindered K + /H + exchange on the RM surface, resulting from limited water/moisture contact. For solvent dispersion of RM, essential conditions include strong dispersion forces and weak polar forces, finely tuned to match the surface property of RM at a certain hydration level. The HSPs of RM determined from dispersion tests were restricted to predicting/characterizing RM-based interfacial phenomena in an environment with strictly controlled water/moisture content. The HSP calculation method proposed herein was applicable to any clay mineral.
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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Dingxuan Zhao,Jiqiang Hu,Dongqing Wang,Jinchuan Yang,Hanqi Zhang,Bing Wang
High performance composites not only pursue high strength , light weight, but also need to have multifunctional characteristics. To further improve curing efficiency and mechanical properties of phthalonitrile resin (PN75) and give full play to its excellent thermal and dielectric properties , mica as reinforcement was introduced into PN75 to form particle-filled resin (Mica/PN75) and CFRP (Mica/PN75/CF) composites. The introduction of mica reduced the curing temperature of PN75 and improved the curing efficiency. The thermal stability of resin and composites was further improved. The bending strength of the two groups of mica reinforced resin increased by 44.87% and 55.97%, and the dielectric constant decreased from 3.3 to 2.7 and 2.5, respectively. The bending strength of the composites was increased by up to 19.9%, and the glass transition temperature of composites was increased by up to 26 °C after reinforcement. The multidirectional reinforcement of PN75 by mica was studied and analyzed in this work.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2024
·Vol. 14
·期 7
·694
·
IF 2.2
Xinyu Zhang,Liuyi Ren,Shenxu Bao,Yimin Zhang,Guohao Chen,Bo Chen
Flotation-introduced nanobubbles were expected to be an efficient and economical method to recover fine muscovite. This study aimed to explore the mechanism of the change appearing in flotation after introducing nanobubbles through micro-flotation, particle vision and measurement, flotation kinetics, and induction time measurement. The results of micro-flotation, which respectively feed muscovite or muscovite pretreated with nanobubbles in different concentrations of dodecylamine (DDA), were fitted with four flotation kinetic models using Origin. Different methods were used to examine how the introduction of nanobubbles affected the flotation process. The results showed that nanobubbles improved both the flotation rate and recovery of muscovite. Nanobubbles played different roles in different stirring intensities. At low stirring intensity, nanobubbles did not perform well. In suitable stirring intensity, nanobubbles helped particles aggregate and improved the collision probability between bubbles and minerals. However, at high stirring intensity, shear forces caused by ultra-high fluid velocities could disrupt particle aggregation.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）