查找使用阿拉丁产品的科研文献

Highly Sensitive MXene/MMT-Based Hydrogel for Wearable Sensors and Flexible Supercapacitors

Haiyan Zhao,Ziqi Wang,Chaohao Yin,Chu Chen,Li Wang,Xin Zhang,Zhuo Wang

In this work, a flexible, stretchable, tough, highly ionic conductive, and anti-freezing hydrogel based on acrylamide/two-dimensional transition metal carbide (MXene)/montmorillonite (MMT) was precisely designed. In the hydrogel, MXene and MMT acted as both cross-linking agents and conductive fillers, delivering high stretchability (1037%) with a strength of up to approximately 67 kPa and high conductivity. As a result, the usual trade-off between conductivity and mechanical properties of hydrogels could be alleviated to some extent. Therefore, the hydrogel could be used as an electrolyte for supercapacitors (SCs) and strain sensors to monitor physical signals. The hydrogel-based SC exhibited outstanding electrochemical performance over a wide temperature range. Moreover, it could easily withstand various deformations, such as bending, twisting, and compression. The hydrogel also exhibited excellent sensing properties, with a short tensile response time and a high-sensitivity factor (GF = 14.8) in the 0–400% range (0 denotes the original state, where both the strain and stretch are zero as there is no deformation at this point). Due to its high conductivity, the prepared hydrogel could be used as a flexible electrode to replace commercial electrodes and record electromyographic (EMG) signals. This work proposes a novel approach for balancing the conductivity and mechanical strength of hydrogels.

Preparation and properties of hybrid epoxy/hydro-terminated polybutadiene/modified MMT nanocomposites

Yi Hongling,Wei Ting,Lin Heng,Zhou Junjie

The effects of hydroxyl-terminated polybutadiene (HTPB) number average molecular weight ( \( \overline{{\boldsymbol{M\fancyscript{n}}}} \) ) and preparation temperature on montmorillonite (MMT) intercalation/exfoliation behavior were investigated. X-ray diffraction and Fourier transform infrared spectroscopy results indicated that 40 to 80°C were the preferred temperatures to obtain nanostructured HTPB/MMT. The higher \( \overline{{\boldsymbol{M\fancyscript{n}}}} \) (> 2800) of HTPB led to a more exfoliated nanostructure than lower \( \overline{{\boldsymbol{M\fancyscript{n}}}} \) as proven by transmission electron microscopy. The tensile strength, tensile modulus, and elongation at break of nanostructured HTPB/MMT/EP ternary composites were higher than those of the HTPB/EP binary blend, which was due to the HTPB/MMT hybrid structure. The effect of increasing molecular weight on impact strength in the ternary system was less than that in the binary system. The HTPB/MMT/epoxy hybrid composites with low concentration could improve the impact strength, which was due to the superposition effect of organic/inorganic nanostructures. In hybrid HTPB/MMT/epoxy composite system, the toughening was attributed to the slow crack growth and fast crack growth, and the dissipated energy of pulling or debonding nanoclay out from the matrix also contributed.

An active and stable Ni/MMT-AE catalyst for dioctyl phthalate hydrogenation

Shilin Nie,Huafan Li,Jingru Qin,Yansu Wang,Libo Niu,Ligong Chen,Guoyi Bai

Several Ni/Montmorillonite (MMT) catalysts were prepared and evaluated in the hydrogenation of dioctyl phthalate to di(2-ethylhexyl) hexahydro-phthalate, an environmentally friendly plasticizer. Notably, a Ni/MMT-AE catalyst, which was prepared by the ammonia evaporation method, showed excellent activity and stability. It could be steadily used ten times under harsh reaction conditions, comparable to most of the noble metal catalysts. TEM results revealed that the active nickel species were highly dispersed on the surface of the MMT support with average particle sizes of 4.1 nm in the Ni/MMT-AE catalyst, resulting in its high activity. XPS and TPR results demonstrated the strong interaction between nickel and the MMT support, which could effectively inhibit the agglomeration and loss of the active nickel species during the reaction, accounting for its outstanding stability.

Enhanced dielectric performance of polypropylene films via plasma-fluorinated MMT@TiO2@SiO2 nanohybrids

Xie Jun,Shi Xiaoyu,Liu Qi,Liu Ziqian,Qiao Chunying,Wang Qi,Xie Qing

The safety and reliability of dry-type film capacitors depend critically on the insulation performance of their dielectric films. Polypropylene (PP) films serve as primary dielectric materials due to their superior insulation properties, high mechanical strength, and excellent heat resistance. With increasing transmission voltages and equipment miniaturization trends, enhancing dielectric film insulation is crucial to ensure ultra-high-voltage (UHV) transmission security. This study incorporates a fluorinated functional layer–modified nanofiller, MMT@T@S-F (MMT@TiO 2 @SiO 2 -F), into PP films via bulk modification. Film breakdown tests demonstrate that at 25 °C, 50 °C, and 75 °C, PP/MMT@T@S-F films exhibit DC breakdown strength increases of 41.26%, 36.26%, and 32.98% respectively, compared to pure PP films. Micro-nano structural analysis reveals elevated interfacial energy levels in MMT@T@S-F nanoparticles. Simultaneously, the organic fluorine modification introduces high-energy charge traps into PP films, further reducing free-moving carriers while maintaining functional effectiveness at elevated temperatures. Graphical abstract

Preparation of KHA/SA/MMT composites and their adsorption properties for Rhodamine B

Song Jie,Li Yidan,Chen Lijun,Zhao Dong,Yu Shuang,Huang Liangxian

Two natural adsorbent materials, potassium humate (KHA) and montmorillonite (MMT), were successfully prepared by embedding them in sodium alginate (SA) gel spheres through physical cross-linking with CaCl 2 . And CaCO 3 was used as a porogenic agent to prepare the porous composites, KHA/SA/MMT. The materials were characterized by using XRD, TGA, SEM, and N 2 adsorption/desorption equipment. The results showed that MMT and KHA were successfully embedded in the SA gel; the introduction of MMT increased the thermal stability of the composites and the embedding of MMT, and the porogenic effect of CaCO 3 increased the specific surface area of the composites substantially, which provided favorable conditions for adsorption and treatment of pollutants. In addition, a one-way exploratory experiment yielded a higher removal rate of Rhodamine B (RhB) at D  = 0.6 g/L, pH = 5, C 0  = 100 mg/L, and t  = 360 min. The adsorption kinetics and adsorption isotherm conformed to the secondary kinetic model and Langmuir model, respectively, and the maximum adsorption of RhB by KHA/SA/MMT could reach up to 884.96 mg/g at 303 K. The adsorption mechanism for RhB was shown by FT-IR and XPS analyses to be possibly bound by non-covalent bonding forces. After seven consecutive adsorption–desorption cycles, the adsorption of RhB by KHA/SA/MMT still reached 80.75%. Therefore, the prepared gel spheres have the advantages of easy regeneration and efficient reuse and great potential for application in purifying RhB from wastewater.

PAMPS/PVA/MMT Semi-Interpenetrating Polymer Network Hydrogel Electrolyte for Solid-State Supercapacitors

Jin Wang,Hucheng Chen,Yahui Xiao,Xianghu Yu,Xiaoxuan Li

Polyelectrolyte hydrogels have great potential as gel-polymer electrolytes (GPE) because of their low-cost and environmental benefits. Here a polyelectrolyte hydrogel of high ionic conductivities and mechanical properties was developed via the formation of semi-interpenetrating polymer network (s-IPN) GPE, which consists of Poly (2-acrylamide-2-methyl propane sulfonic acid) (PAMPS), poly(vinyl alcohol) (PVA) and sodium montmorillonite(MMT). The additions of MMT and PVA can both increase the ionic conductivities and the tensile strength of PAMPS. PAMPS/PVA/MMT s-IPN GPE show excellent overall performance of ionic conductivity of 6.4×10 -2 S cm -1 and tensile strength of 24.3 MPa when the ratio of PVA/AMPS is at 0.8:1 and MMT is at 7wt%. When PAMPS/PVA/MMT s-IPN is used as a GPE in supercapacitors, it exhibits good electrolyte behavior with its specific capacitance of 208 F g -1 , close to that of using 4M KOH aqueous solution electrolyte.

PDA-MMT/Au@Ag SERS Substrate for Ultrasensitive Thiram Detection and Multiplex Pesticide Screening

Guo Jingtong,Ma Xiaodi,Song Wenjing,Yu Long

This study develops a novel, eco-friendly Surface Enhanced Raman Scattering (SERS) substrate, PDA-MMT/Au@Ag NPs, for ultrasensitive thiram (TRM) detection and pesticide screening. The substrate integrates polydopamine-functionalized montmorillonite (PDA-MMT) with Au@Ag core–shell nanoparticles synthesized via solvent-free photoreduction. MMT enriches analytes and prevents nanoparticle aggregation, while Au@Ag NPs generate high-density plasmonic hotspots. This dual synergy enables exceptional performance: a TRM detection limit of 1.34 × 10⁻⁹ M in solution (far below the FDA limit), with high uniformity (RSD = 9.54%) and stability (> 28 days). The substrate also demonstrates versatility for dyes (R6G, CV, NBA) and other pesticides. Optimization confirmed 30 min UV irradiation and a 1:10 MMT-to-Au@Ag volume ratio as ideal parameters. Characterization by TEM, XRD, XPS, and UV–vis validated the successful synthesis and core–shell structure. Compared to existing SERS platforms, this substrate offers superior sensitivity, reduced noble metal usage, and simpler, chemical-reductant-free fabrication, making it promising for on-site food safety and environmental monitoring.

Polyelectrolyte Complex/MMT Hybrid for SPI/WE Adhesives with Balanced Flame Retardancy and Shear Strength

Soybean protein isolate (SPI) adhesives are eco-friendly but suffer from poor water resistance and bonding strength. Waterborne epoxy (WE) can effectively improve these properties; however, WE-modified SPI adhesives can hardly satisfy the growing stringent flame-retardant demands for plywood. Herein, we report a composite adhesive (SPI/20WE/THPS@CS/MMT) that simultaneously exhibits favorable flame retardancy and dry and wet shear strengths. In this system, a phosphorus-, nitrogen-, and sulfur-containing polyelectrolyte complex (THPS@CS) is fabricated by vacuum-drying an ionically crosslinked polyelectrolyte hydrogel derived from bis[tetrakis(hydroxymethyl)phosphonium] sulfate (THPS) and chitosan (CS) and subsequently incorporated into the SPI/WE matrix (SPI/20WE) together with montmorillonite (MMT). The plywood bonded with SPI/20WE/THPS@CS/MMT achieves a limiting oxygen index (LOI) of 28.0% and shows significantly reduced heat release in cone calorimeter tests. Meanwhile, the resultant plywood possesses high dry and wet shear strengths that fulfill the interior-use plywood criteria specified in GB/T 9846–2015. This work offers new insights into the design and fabrication of high-performance eco-friendly plywood adhesives.

Electrochemical performance and stability of a PPy/MMT-PVDF/PMMA composite film at high temperature

Shuo Yang,Xuan Li,Huijun Li,Pei Yao

A polypyrrole/montmorillonite-polyvinylidenedifluoride/polymethyl methacrylate (PPy/MMT-PVDF/PMMA) composite film was prepared by a solvent casting technique. The surface morphology and cross-sectional structure of the 12 wt.% PPy/MMT-PVDF/PMMA composite film exhibited porosity with high specific surface area and good adsorption capacity. The 12 wt.% PPy/MMT-PVDF/PMMA composite film shows good electrolyte uptake (241%) and electrochemical stability. The ionic conductivity of the 12 wt.% PPy/MMT-PVDF/PMMA composite film with LiPF 6 organic electrolyte reaches 2.45 × 10 −3 S cm −1 at 20 °C. The Li/LiNi 1/3 Co 1/3 Mn 1/3 O 2 cell assembled with the 12 wt.% PPy/MMT-PVDF/PMMA composite film and LiPF 6 organic electrolyte exhibits good capacity retention and cycling performance at 1 C and 60 °C. At the same time, the nucleophilic substitution reacts with the PPy/MMT-PVDF/PMMA composite film and HF from hydrolysis by trace moisture of LiPF 6 in the electrolyte solution, which can inhibit the disproportionation of Mn 3+ in the LiNi 1/3 Co 1/3 Mn 1/3 O 2 electrode material and decrease the internal resistance of the cell at high temperature. In conclusion, the PPy/MMT-PVDF/PMMA composite film can be employed in Li-ion batteries.

Hydrophilic modification of polylactic acid synergistic MMT@ZIF-8@TA nanocomposite membrane for dye wastewater purification

Ying Xue,Xiaonan Hao,Yue Wu,Yang Xu,Jundi Long,Jian Dong,Yuanrui Wang,Shulin Sun

Combined NVP grafting and MMT@ZIF-8@TA modification raised pure water flux to 836.84 L·m⁻²·h⁻¹, ~6.8× of pristine PLA membrane. • The membrane retained over 95% rejection for four cationic/anionic dyes, realizing charge-selective adsorption (98% MeB removal, 99% AO removal). • PZ4 membrane removed 78.59% methylene blue under UV in 150 min; its rate constant (0.00995 min⁻¹) was ~110 times the blank group. • Superoxide (•O₂⁻) and hydroxyl (•OH) radicals were verified as the main active species during photocatalytic degradation. Rapid industrialization and urbanization have exacerbated water scarcity and pollution. Traditional polymer membranes are non‑renewable and non‑biodegradable. Polylactic acid (PLA) is a biodegradable and renewable alternative, but its hydrophobicity and lack of functional groups restrict its direct application in water purification. To address these limitations, we grafted N‑vinylpyrrolidone (NVP) onto PLA chains via free‑radical polymerization to obtain PLA‑g‑PVP with enhanced hydrophilicity. Zeolitic imidazolate framework‑8 (ZIF‑8) was grown in situ on montmorillonite (MMT) and coated with tannic acid (TA) to obtain MMT@ZIF‑8@TA nanoparticles, which synergistically improve membrane porosity, adsorption capacity, and photocatalytic activity. A series of PLA‑g‑PVP/MMT@ZIF‑8@TA (PZ) membranes were fabricated by non‑solvent induced phase separation. The PZ4 membrane exhibited a pure water flux of 836.84 L·m⁻²·h⁻¹ , approximately 6.8 times that of pristine PLA, and achieved over 95% rejection for four representative dyes, including both cationic (auramine O, methylene blue) and anionic (congo red, methyl blue) dyes. After five cycles, the flux recovery rate remained 81.03% with dye rejection > 90%, showing excellent reusability. The PZ membranes also demonstrated adsorption and photocatalytic activity. The PZ4 membrane degraded 78.59% of methylene blue within 150 min under UV irradiation, attributed to efficient separation of photogenerated electron‑hole pairs and synergistic oxidation by hydroxyl (·OH) and superoxide (·O 2 ⁻) radicals, leading to dye mineralization. This eco‑friendly membrane integrates high separation efficiency, which shows great potential for the purification of dye-containing wastewater, and sheds light on the design of multifunctional composite filtration membranes. Download: Download high-res image (266KB) Download: Download full-size image

Fabrication of durable fluorine-free superhydrophobic polyethersulfone (PES) composite coating enhanced by assembled MMT-SiO2 nanoparticles

Xiguang Zhang,Huaiyuan Wang,Zhanjian Liu,Yixing Zhu,Shiqi Wu,Chijia Wang,Yanji Zhu

A durable fluorine-free polyethersulfone (PES) superhydrophobic composite coating with excellent wear-resistant and anti-corrosion properties has been successfully fabricated by combining sol-gel and spray technology. The robust micro/nano-structures of the prepared surface were established by introducing binary montmorillonite-silica (MMT-SiO 2 ) assembled composite particles, which were formed by in-situ growth of SiO 2 on MMT surfaces via sol-gel. Combined with the low surface energy of amino silicon oil (APDMS), the fluorine-free superhydrophoic PES coating was obtained with high water contact angle 156.1   ±   1.1° and low sliding angle 4.8   ±   0.7°. The anti-wear of the final PES/APDMS/MMT-SiO 2 superhydrophobic coating can reach up to 60,100 cycles, which is outdistancing the pure PES coating (6800 cycles) and the PES/MMT/SiO 2 coating prepared by simple physical mixture (18,200 cycles). The enhanced wear resistance property can be mainly attributed to the lubrication performance of APDMS and stable interface bonding force between the MMT surface and SiO 2 . Simultaneously, potentiodynamic polarization curves and electrochemical impedance spectroscopy exhibited the outstanding anti-corrosion property of PES/APDMS/MMT-SiO 2 composite coating, with low corrosion current (1.6   ×   10 −10   A/cm 2 ) and high protection efficiency (99.999%) even after 30   d immersion process. These test results show that this durable superhydrophobic PES composite coating can be hopefully to provide the possibility of industrial application.

Synthesis and characterization of poly(AM-SSS-AMPS)/ O-MMT nanocomposite microspheres with tailored nanomechanical properties

Jingqi Ji,Jianqing Zhao,Yangchuan Ke

In order to overcome the inherent defects of traditional polymer microspheres as plugging agent used in oilfields, including weak mechanical properties , low dispersity in water and poor adaptability to harsh conditions, an organo-modified montmorillonite (O-MMT) was incorporated to form an exfoliated structure in acrylamide/sodium 4-styrenesulfonate/2-acrylamido-2-methyl propane sulfonic acid (AM-SSS-AMPS) terpolymer matrix via in-situ polymerization. Such exfoliated structure not only exhibited a considerable enhancement in the comprehensive properties of nanocomposites , such as viscoelasticity , heat and shear-resistance, but also improved nanomechanical properties of microspheres. The results of nanomechanical properties showed that the energy dissipation and adhesion of nanocomposite with 3.0 wt% O-MMT were decreased to only 1.9% and 4.7% of those of the original terpolymer, respectively, implying the reduction in the agglomeration and energy consumption of microspheres in aqueous suspension. Rheology test demonstrated that the suspension (5.0 wt%) of nanocomposite microsphere with 2.0–3.0 wt% O-MMT behaved as pseudoplastic fluid, Newtonian fluid and dilatant fluid in turn at the shear rate from 10 s −1 to 1000 s −1 , which indicated a better arrangement of microspheres in suspension under shear stress. G′ and G′′ of the suspension of nanocomposite microspheres with 3.0 wt% O-MMT were 696.6 times and 84.4 times higher than those of the terpolymer suspension, respectively, and the corresponding viscosity was 10.4 times higher at 90 ℃. These superior properties of nanocomposite microspheres will meet the tough requirements of oilfield development.