Journal of the Taiwan Institute of Chemical Engineers
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2026
·
IF 6.9
Qi Cheng,Sheng Liu,Shiyong Zhang,Guangyi Liu
Background In mixed anionic-cationic collector systems, sodium hexametaphosphate (SHMP) is commonly required as a depressant to realize the flotation separation of lepidolite from albite and quartz. However, its effect mechanism to the flotation performance of anionic-cationic collector is unclear. Methods Micro-flotation, contact angle, Zeta potential, adsorption capacity, optical microscopy, FTIR, in-situ AFM imaging and AFM force measurements were employed to investigate the flotation performance and the adsorption mechanism of SHMP and dodecylamine (DDA) + sodium lauryl sulfate (SLS) on lepidolite, albite and quartz. Significant Findings With 5.0×10 −5 mol/L SHMP pre-addition, DDA+SLS achieved 90.01% Li 2 O recovery with 4.04% Li 2 O grade from an artificial ternary mixture of 1.83% Li 2 O at pH∼7.0, DDA: SLS molar ratio = 2: 1 and C DDA +C SLS =1.5×10 −4 mol/L. SHMP adsorbed on albite and quartz by the hydrogen bonds between P-OH/P-O − groups of SHMP and Si-O − /Si-OH and Al-O − /Al-OH sites on albite as well as Si-O − /Si-OH sites on quartz. With SHMP+DDA+SLS addition, SHMP-DDA and SLS-DDA complexes formed and adsorbed onto lepidolite basal planes through the hydrophobic interactions, whereas no adsorption occurred on albite and quartz due to the absent hydrophobic interactions. This differential adsorption generated the distinct surface wettability, enabling the selective lepidolite recovery.
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POLYMER TESTING
·
2026
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IF 6.4
Shaodong Wang,Xiaoxiao Duan,Jianbing Wu,Chunxuan Li,DeJun Gao,Quan Yuan,Shiwei Xu
P/N-functionalized nano-CaCO 3 with improved dispersibility was prepared using atwo-step SHMP/ATMP strategy. • The synergistic nano-CaCO 3 /IFR enabled UL 94 V-0 rating at reduced flame-retardant loading while improving tensile ductility. • Dense char formation induced by gas-condensed phase synergy enhanced thermal stability and flame retardancy. Polypropylene (PP) is a commonly used non-metallic material in automotive lightweighting. To meet the requirements of carbon neutrality and green environmental policies and to promote energy conservation and emission reduction in the automotive sector, this study focuses on balancing the flame retardancy and mechanical properties of PP composites. To this end, nano-CaCO 3 was synergistically modified with phosphorus and nitrogen using three routes: a one-step sodium hexametaphosphate (SHMP)/urea method, a two-step SHMP/Urea method, and a two-step SHMP/aminotrimethylene phosphonic acid (ATMP) method. After subsequent hydrophobic modification, the P/N-modified nano-CaCO 3 was blended with an intumescent flame retardant (IFR) and PP to prepare flame-retardant PP composites. The results indicate that the modification successfully introduced phosphorus- and nitrogen-containing groups onto the surface of nano-CaCO 3 without altering its calcite crystal structure. Among these methods, the SHMP/ATMP two-step route showed the highest modification efficiency, resulting in superior dispersibility and thermal stability. With the appropriate incorporation of modified nano-CaCO 3 into the PP/IFR system, the composites exhibited a marked synergistic flame-retardant effect. When the IFR content was 20 wt%, the UL 94 rating was improved from V-1 to V-0, while the elongation at break was significantly increased. Concurrently, the modified nano-CaCO 3 promoted the formation of a dense and stable char layer, increasing the char yield at 600°C from 12.9% to 23.0%. These results indicate that modified nano-CaCO 3 serves as a highly effective synergistic additive that combines both flame-retardant and toughening properties. This study provides an effective strategy for simultaneously enhancing both the flame-retardant and mechanical properties of PP composites in low-additive flame-retardant systems.
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CERAMICS INTERNATIONAL
·
2026
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IF 6
Kui Ding,Anqi Sheng,Jing Song,Shuyan Song,Hongjie Zhang,Lang Zhao
To address the low removal rate, severe surface damage, and unclear mechanism of A-plane sapphire during chemical mechanical polishing, a novel Al 2 O 3 -CeO 2 mixed-abrasive slurry was developed by integrating the mechanical abrasion of Al 2 O 3 with the chemical reactivity of CeO 2 . The optimal formulation, containing 2 wt% Al 2 O 3 , 0.2 wt% CeO 2 , 0.15 wt% sodium hexametaphosphate, 0.7 wt% isooctanol polyoxyethylene ether, and 0.5 wt% sodium D-gluconate with aminomethyl propanol as pH regulator, yields an atomically smooth surface (Ra = 0.079 nm) and a high removal rate (MRR = 905 nm/h). XPS analysis reveals that a hydrated Al-OH layer and a CeAl x O y soft phase form on the sapphire via interfacial solid-state reaction, and are removed by mechanical shearing of the mixed abrasives.
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WATER AIR AND SOIL POLLUTION
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2026
·Vol. 237
·期 12
·717
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IF 3.5
Luo Yuwen,Jiang Qingxi,Zhang Hualin,Qi Shuangxing,Zen Yuanlai,Peng Chenliang,Wang Guanshi
The extensive use of ammonium sulfate as a leaching agent in the mining process of ion-adsorption rare earth ores (IAREO) has led to severe pollution of ammonia nitrogen in the wastewater of historical residual ores. In this study, natural clinoptilolite was modified using sodium hexametaphosphate (SHMP) to elucidate both the enhanced adsorption performance and the fundamental mechanisms governing NH 4 + removal. Single-factor experiments identified the optimal modification conditions as an SHMP concentration of 0.1 mol·L −1 , a temperature of 80 °C, and a duration of 3 h, under which the NH 4 + adsorption capacity of modified clinoptilolite increased to 2.6 times that of the natural clinoptilolite. Characterization using SEM, BET, XRD, and FTIR revealed that SHMP treatment increased surface roughness and enhanced pore structure without altering the crystalline framework. Adsorption experiments demonstrated that NH 4 + adsorption onto the modified material conformed to the pseudo-second-order kinetic model and the Langmuir isotherm, yielding a maximum adsorption capacity of 16.72 mg·g −1 , indicating a chemisorption-dominated process characterized by spontaneous, exothermic monolayer adsorption . Ion exchange was proven as the primary mechanism, with NH 4 + replacing Na + in the clinoptilolite structure, while coexisting cations such as K + and Ca 2+ markedly inhibited adsorption. Additionally, the modified clinoptilolite exhibited substantial removal efficiency when applied to actual wastewater from IAREO operations. Overall, the findings demonstrate the effectiveness of SHMP-modified clinoptilolite and provide guidance for ammonia–nitrogen remediation in IAREO sites.
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Materials Today Communications
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2026
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IF 4.9
Fuwen Chen,Wei Yang,Jiong Zhao,Bin Liu,Weipeng Miao,Bozhi Li,Yafei Fan
The fabrication of high-performance SiC power devices imposes stringent requirements on low-damage and high-consistency wafer thinning processes. To address challenges associated with ultrafine abrasive dispersion and pore structure regulation in vitrified-bonded diamond grinding wheels, the present study proposed an ice-templating method to fabricate diamond grinding wheels with aligned porous structures. Effects of solid loading and glycerol content on microstructure, mechanical properties, and grinding performance of the wheels were systematically investigated. Results showed that glycerol regulated ice crystal morphology, transforming pore structure from lamellar to interconnected “bead-like” form while significantly enhancing flexural strength. Increasing solid loading reduced lamellar spacing and improved both density and strength. Grinding wheel prepared with solid loading of 60 wt% and 5 wt% glycerol exhibited excellent grinding performance on SiC wafers. It achieved surface roughness ( R a = 2.23 nm) significantly lower than that of conventionally cold-pressed wheel ( R a = 3.42 nm), while maintaining uniform surface free of obvious damage. Moreover, the subsurface damage layer thickness was reduced to 105.6 nm compared to 198.5 nm for the conventional wheel. The present study demonstrated that ice-templating method enabled simultaneous uniform dispersion of abrasives and controlled pore structure, thereby providing efficient tool solution for precision grinding of hard and brittle materials such as SiC.
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LANGMUIR
·
2025
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IF 3.9
Jingbo Sun,Xudong Zheng,Youming Zhu,Lin Guo,Xuan Ma,Xinmiao Pan,Xiang Gu,Jinfeng Mei,Jian Rong,Zhongyu Li
Under the imperative of a circular economy, the efficient recovery of rare earth elements (Lanthanum) from secondary resources is paramount. To overcome the shortcomings of traditional powder adsorbents, such as easy agglomeration and difficult separation, phosphorylated layered double hydroxides (P-LDH) were prepared and immobilized onto the matrix of delignified wood aerogel (WA) to fabricate phosphorylated layered double hydroxide-modified wood aerogel (P-LDH/WA). By intercalating phosphate anions into the interlayer of LDH, specific La(III) chelating sites were assigned to it. The WA substrate retains the renewability of wood and provides a framework with a hierarchical porous structure that can efficiently load P-LDH nanoparticles. Research has shown that the adsorption process of P-LDH/WA follows PSOKM (R2 > 0.992), confirming the dominant role of chemical adsorption. When pH = 7.0, P-LDH/WA exhibits excellent La(III) adsorption performance, which is more in line with the Langmuir model (R2 > 0.991). The maximum adsorption capacity reaches 58.26 mg g–1, significantly better than WA (22.10 mg g–1), And maintain an adsorption efficiency of 81.3% after 3 regeneration cycles, with reusability. Thermodynamic analysis shows that the adsorption process is spontaneous (ΔG° < 0) and endothermic (for P-LDH/WA, ΔH° = 3.77 kJ/mol), indicating that the adsorption capacity increases with increasing temperature. P-LDH/WA combines high capacity, easy separation, and reusability to efficiently recover lanthanum(III) from secondary resources.
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PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2025
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IF 6.1
Gai Zhao,Zhiyuan Guo,Jingfu Song,Guoqing Wang,Yanbo Zhao
Micro-arc oxidation (MAO) is a widely utilized surface modification technique for aluminum alloys, but its inherent porosity compromises both wear and corrosion resistance in aggressive environments. This study addresses these limitations by integrating a photocurable polyurethane acrylate (PPUA) coating with different surface textures onto the MAO-treated aluminum alloy using 3D printing. Mercury intrusion porosimetry revealed that the PPUA coating significantly reduced porosity and total intrusion volume, leading to a denser and less permeable surface. Tribological evaluations demonstrated that surface texture plays a critical role in friction and wear behavior. The flat surface exhibited the highest friction coefficient and the highest wear rate. Square textured surface displayed a moderate friction coefficient but suffered from severe plastic deformation and debris accumulation, contributing to an increased wear rate. Meanwhile, circular textured surface exhibited the lowest friction coefficient and wear rate. Potentiodynamic polarization tests confirmed that the PPUA coating significantly enhanced corrosion resistance by increasing the corrosion potential and reducing the corrosion current density, effectively limiting electrolyte infiltration. These findings suggest that the combination of MAO with a tailored photocurable polymer coating offers a promising approach to optimizing the mechanical durability and corrosion protection of aluminum alloys for advanced engineering applications.
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CEMENT & CONCRETE COMPOSITES
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2025
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IF 13.1
Xin Wang,Amani Khaskhoussi,Xiang Hu,Jianming Yang,Caijun Shi
Magnesium phosphate cement (MPC) has attracted attention as a green coating material owing to its excellent adhesion and dense structure. However, MPC's natural hydrophilicity and poor water stability make it susceptible to infiltration by water containing harmful ions, limiting its application as a coating material. This study investigates the effect of polydimethylsiloxane (PDMS) on the wettability of MPC coatings with hierarchical structures. The chemical functional groups and surface morphologies of PDMS-modified MPC coatings were analyzed. The surface free energy of MPC surface was evaluated to understand the physicochemical properties of MPC surface. Static contact angles of MPC coatings with varying PDMS contents were measured using four polar and non-polar liquids. The most important and widely used models were applied to calculate the surface free energy of MPC coatings, assessing the suitability of each model. Wetting envelopes were constructed for the various surfaces to predict the wettability of the MPC with commonly employed liquids. The results indicate that the addition of PDMS successfully transformed MPC from hydrophilic to highly hydrophobic. The improvement in water repellency is due to the cross-linking reaction between PDMS and MPC, which lowers the surface energy through chemical modification. Additionally, the formation of hierarchical structures increases surface roughness, further improving hydrophobicity. Envelope curves were successfully designed to predict the wettability of the coating across a large range of liquids.
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CERAMICS INTERNATIONAL
·
2026
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IF 6
Yinsha Wei,Yibo Ouyang,Zhihao Zhou,Ke Li,Ri Qiu,Jin Zhao
Despite inherent corrosion resistance of titanium and its alloys, their performance can be compromised in service by galvanic corrosion, hydrogen embrittlement, and biofouling. In this study, an integrated approach combining micro-arc oxidation (MAO) with electrochemical deposition is employed to fabricate a robust superhydrophobic surface (SHS) on TA2 titanium alloy, achieving integration of wear resistance, corrosion inhibition, and anti-fouling properties. Firstly, the ceramic layer is fabricated onto the Ti alloy surface via the MAO approach, and the porous matrix is achieved. Secondly, the electrodeposition is used to grow the europium myristate complex, which shows the superhydrophobicity wettability due to the intrinsic hydrophobicity and roughness of the deposit. For the anticorrosion capability evaluation, the potentiodynamic polarization curves indicate that the SHS has the lowest corrosion current density ( i corr = 2.67 × 10 −8 A/cm 2 ), compared with the MAO coating ( i corr = 3.08 × 10 −7 A/cm 2 ) and bare TA2 substrate ( i corr = 4.60 × 10 −7 A/cm 2 ). For the anti-biofouling performance, surface coverage of P. aeruginosa biofilm is at 15.48% for TA2, 4.20% for the MAO coating, and only 0.14% for the SHS. These results demonstrate that the MAO/SHS composite coating developed on the TA2 substrate is a highly promising strategy to mitigate biofouling.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Tingting Xu,Ruixiang Xie,Yiyu Long,Jianrong Da,Yao Xu,Guanghui Lu,Huiyang Bian,Shumei Wang,Hongqi Dai
The development of multifunctional papermaking additives has long been a research focus. Attapulgite, a naturally abundant chain-layered magnesium-aluminosilicate clay mineral, is a promising non-metallic resource. When incorporated into pulp, its notable adsorption capacity, colloidal properties, and hydroxyl-rich structure may promote compatibility with plant fibers, thereby improving paper uniformity, smoothness, and flexibility. Furthermore, owing to its high specific surface area and strong surface adsorption effects, attapulgite can be easily surface-modified through simple treatments to enhance bonding between paper fibers and fillers, reduce retention aid usage, and even serve as a functional filler. However, current challenges include irregular mining practices for raw attapulgite ores, compositional complexity, insufficient analysis of its structural and physicochemical properties, and limited research on post-modification strategies, all of which hinder its high-value applications. To address these limitations, this study utilized raw attapulgite ore as a base material. After purification via a straightforward washing method, its surface was modified with polydopamine to serve as a carrier for silver nanoparticles, yielding a highly dispersed functional attapulgite-based filler for papermaking. The modified attapulgite filler demonstrated significant performance enhancements: after paper formation, the white water turbidity decreased from 81.8 NTU to 40.3 NTU. The paper tensile index was maintained with a slight improvement, increasing from 23.97 N·m·g⁻¹ to 24.81 N·m·g⁻¹ . No significant adverse effects were observed on the bulk, opacity, or whiteness. Moreover, it exhibited favorable antibacterial activity, with inhibition zone diameters of 11.80 mm and 12.14 mm against E. coli and S. aureus , respectively. These results confirm that simple purification and modification strategies can endow attapulgite fillers with multifunctionality, providing a practical reference for future applications of attapulgite-based functional materials in the paper industry.
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JOURNAL OF POLYMER RESEARCH
·
2026
·Vol. 33
·期 4
·140
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IF 3.5
Wang Ziyu,Wu Ranran,He Yanyang,Hu Yufang,Wang Sui,Mao Jie
Addressing the critical challenge of balancing mechanical robustness and electrical conductivity in hydrogels for wearable sensors, this study proposes a synergistic processing strategy that integrates freeze-thaw cycling, thermal annealing, and the Hofmeister effect-induced salting. A ternary composite hydrogel was prepared with polyvinyl alcohol (PVA) as the matrix, polyethyleneimine (PEI) to enhance crosslinking and biocompatibility, and carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) to improve conductivity. The optimized freeze-thawing-annealing (100 °C, 20 min) and salting-out (1.5 M NaCl) process resulted in a densely cross-linked network featuring significantly enhanced crystallinity and a homogeneous, pore-free microstructure. This hierarchical structure confers upon the hydrogel outstanding mechanical properties: tensile strength of 4.15 MPa, toughness of 17.73 MJ/m 3 , elastic modulus of 2.84 MPa, and a high fatigue threshold of 117.4 J/m 2 . Simultaneously, the electrical conductivity of the hydrogel reached 0.449 S/m. The hydrogel demonstrated excellent strain/pressure sensing capabilities, featuring tunable gauge factors (GF = 0.87–2.12 within the 0-100% strain range) and pressure sensitivity (0.145 kPa -1 below 2 kPa). The practical applicability of the hydrogel was verified by reliably monitoring various human motions in real-time. This research offers a scalable and effective material design strategy for next-generation flexible electronics.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
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2023
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IF 3.9
Jiguang Huang,Haiping Chen,Jihao Yang,Ziwei Du,Heng Zhang,Zhaohao Li
Transport membrane condenser can efficiently recover water and heat from wet flue gas . Ceramic membrane is the heat and mass transfer medium in the process. However, the relationship between membrane property and the recovery performance is only partially reported based on current research state. This work focuses on the effects of permeability, material, and ceramic particle size of membrane on the water and heat recovery. Membranes were prepared from three different sizes of coal fly ash and an alumina powder. Water and heat recovery performances of the membranes are experimentally compared. Results indicate that increasing membrane permeability improves water and heat recovery because the resistance of heat and mass transfer is reduced. The alumina membrane performs 3–10% more water recovery than the coal fly ash-based membrane while thermal conductivity of the alumina membrane was 11.5 times that of the coal fly ash-based membrane. Increasing ceramic particle size shows two opposite effects on the water and heat recovery, promotion because of the permeability rising, and undermine because of the thermal conductivity reduction. Low-cost membranes with high permeability and high thermal conductivity are recommended in transport membrane condenser application.
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危险品化学品经营许可证（带存储）