MATERIALS SCIENCE-POLAND
·
2023
·Vol. 41
·期 2
·354-367
·
IF 1.1
Biyang Tuo,Xiulong Shi,Jinwang Tian,Jianli Wang
To broaden the light response range of TiO2 and improve its photocatalytic activity, BiOCl/TiO2/MMT composite materials (BTMC) with outstanding photocatalytic performance were prepared by the sol-gel method with montmorillonite (MMT) as the supporting material, tetrabutyl titanate as titanium source and, bismuth nitrate pentahydrate as the bismuth source. The properties of the prepared materials were characterized by X-ray diffractometer (XRD), surface and porosity analysis (BET), scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), and ultraviolet-visible diffuse reflection spectroscopy (UV-Vis DRS). When the Bi/Ti molar ratio was 20%, the composite material exhibited a slit mesoporous structure, and its specific surface area was 109.02 m2/g, with optimum photocatalytic activity. TiO2 and BiOCl formed the type-II heterojunction on the surface of MMT, which facilitates the transfer of photogenerated electrons and holes, thus enhancing the photocatalytic activity of BTMC-20. The results of this study indicated that BTMC-20 is a promising photocatalytic composite material and has better photocatalytic properties under visible light.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Feng Qi,Shaolong Li,Zengqiong Zhao,Liyufen Dai,Chunyang Di,Yutong Li,Jinbin Wang,Hongjia Song,Jing Chen,Zhao Fu,Xiangli Zhong,Xiaoping Ouyang
Polyurethane elastomer (PUE) is extensively used for impact protection owing to commendable strength and toughness. However, PUE suffers from insufficient energy absorption and easy cracking under high-speed impact. Herein, hybrid nanomaterials (MMT/CNTs), formed by combining functionalized carbon nanotubes (CNTs) and organically modified montmorillonite (MMT) through ionic bonding, were incorporated into PUE, which enhances the impact resistance significantly under high-speed conditions. The enhancement of the impact resistance of the PUE composites was ascribed to the hybridization of CNTs and MMT, which facilitated the dispersion of each other in the matrix. Meanwhile, the CNTs anchored in the MMT interlayer can effectively support the interlayer space and promote internal stress and heat transfer. The results revealed that incorporating CNTs expanded MMT's interlayer spacing to 3.84 nm. Compared to pure PUE, the composites containing 2 wt% MMT/CNTs showed an increase in compressive strength, modulus of elasticity, dynamic compressive strength, and energy absorption by 61.0%, 111.6%, 73.8%, and 49.0%, respectively. This work shows that the PUE-MMT/CNTs is expected to be used as a high-performance impact-resistant material in aerospace, military defense, and other high-speed impact fields.
研究领域:
材料科学
·
力学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jin Wang,Xianghu Yu,Cui Wang,Kechuang Xiang,Mengde Deng,Huabing Yin
PAMPS/MMT composite electrolytes with high ionic conductivities were prepared by solution-casting method. The influences of Na-MMT contents on the ionic conductivities and mechanical properties of PAMPS hydrogel electrolyte were characterized and the electrochemical properties of supercapacitor with PAMPS/MMT composite electrolytes were investigated. The addition of Na-MMT can increase the ionic conductivities, tensile strength of PAMPS. PAMPS/MMT composite electrolyte has the superior integrated performance of ionic conductivities and tensile strength when the mass fraction of Na-MMT is about 5–7%, the ionic conductivity is 5.91 × 10 −2 S cm −1 and the tensile strength is 8.9 MPa. The capacitor exhibits ideal behavior for the electronic double-layer capacitance. The specific capacitance and the cycling stability of PAMPS/MMT composite electrolytes are enhanced in comparison with that of PAMPS. Thus it provides a promising composite polyelectrolyte for supercapacitor .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2018
·
IF 4.155
Wei Yanke,Mei Lefu,Li Rui,Liu Meng,Lv Guocheng,Weng Jianle,Liao Libing,Li Zhaohui,Lu Lin
Hexavalent chromium species, Cr(VI), which can activate teratogenic processes, disturb DNA synthesis and induce mutagenic changes resulting in malignant tumors. The detection and quantification of Cr(VI) is very necessary. One of the rapid and simple methods for contaminant analysis is fluorescence detection using organic dye molecules. Its application is limited owing to concentration quenching due to aggregation of fluorescent molecules. In this study, we successfully intercalated 7-amino-4-methylcoumarin (AMC) into the interlayer space of montmorillonite (MMT), significantly inhibited fluorescence quenching. Due to enhanced fluorescence property, the composite was fabricated into a film with chitosan to detect Cr(VI) in water. Cr(VI) can be detected in aqueous solution by instruments excellent, ranging from 0.005 to 100 mM with a detection limit of 5 μM.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 33
·e03115
·
IF 2
Zhonglian Yang,Huayao Zhang,Lifang Hu,Xin He,Wanling Min,Hui Peng,Jichao Zhu
Graphical In the ZnO/MMT composite catalyst, the high dispersion of ZnO on the MMT surface enhances the interaction between the oxide and the carrier, accelerates the spatial separation of photo generated carriers, and improves the degradation efficiency of tetracycline hydrochloride. Efficient degradation of antibiotics is an effective means to control environmental pollution. In this study, a series of ZnO/MMT composite photocatalysts were prepared by an impregnation method using montmorillonite (MMT) as the precursor. The structure and physicochemical properties of the photocatalysts were characterized by the different characterization technologies, such as X-ray diffraction (XRD), scanning electron microscope mapping (SEM-Mapping), Fourier transform infrared spectroscopy (FTIR), UV–vis absorption spectra, N 2 adsorption–desorption isotherm, X-ray photoelectron spectroscope (XPS), ultraviolet photoelectron spectroscopy (UPS), electrochemical impedance spectroscopy (EIS), and so on. The photocatalytic degradation performance and mechanism for tetracycline hydrochloride were studied. The results show that the spectral response performances of the as-prepared samples are improved by a composite process. Among them, ZnO 20 /MMT-300 has the largest degradation efficiency (91.61%) and the best catalytic activity, and its maximum apparent rate constant is 3.590 × 10 −3 L·mg −1 ·min −1 . The analysis of photocatalytic mechanism and energy band structure shows that the main active substance of the system is h + , and the photocatalytic degradation process follows the type II heterojunction photocatalytic reaction mechanism. This study provides ideas for the design and construction of high-efficiency photocatalytic composites, and provides a reference for the photocatalytic degradation of other organic pollutants.
研究领域:
环境科学
·
材料科学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2013
·
IF 3.494
Jimin Guo,Xinying Li,Changdao Mu,Hanguang Zhang,Pan Qin,Defu Li
Freezing–thawing is used as a new method to disperse montmorillonite (MMT) in dialdehyde carboxymethyl cellulose (DCMC) crosslinked gelatin-based films. The effects of freezing–thawing on the structure and properties of gelatin-DCMC-MMT films were investigated. The data of XRD indicate that freezing–thawing plays an important role in dispersing MMT into gelatin matrix and reducing the nanoparticles aggregation. The optical properties studies show that gelatin-DCMC-MMT films are very transparent and have excellent barrier properties against UV light. Freezing–thawing process decreases the transparency of films at visible region due to the better dispersion of MMT. The resulting films exhibit similar total soluble matter (TSM) values. However, the films prepared by freezing–thawing method have higher moisture content (MC), may be resulting from the more void volume obtained during the freezing–thawing process. The water vapor permeability (WVP) measurements show that the addition of MMT decreases the WVP of the films. Moreover, the freezing–thawing method can further decrease the WVP of the films. In addition, the films prepared by freezing–thawing are observed with better mechanical properties and thermal stability. The results suggest that the freezing–thawing method is beneficial to dispersing MMT into the gelatin matrix and raising the properties of DCMC crosslinked gelatin-MMT films.
研究领域:
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Engineered Fibers and Fabrics
·
2016
·
IF 0.538
Quan Feng,Dingsheng Wu,Shan Huan,Man Li,Xin Li
In this paper, a novel nano-material was prepared, and then was applied for enzyme immobilization. Amidoxime ployarcylonitrile /montmorillonite (AOPAN/MMT) composite nanofibrous membranes were generated by electrospinning and amidoxime modification, then the nanofiber membranes were modified by glutaraldehyde; the modified AOPAN/MMT composite nanofibers were applied in laccase immobilization by adsorption and crosslinking method. Scanning electron microscopy was used to visualize the morphology of the nanofibers, and Fourier transform infrared spectroscopy was used to provide information on the surface chemistry of original and modified nanofibers. At the same time, the optimization of immobilization conditions and the relative properties of the immobilized laccase were also studied in this thesis. According to the experimental results the optimum conditions of laccase immobilization were obtained: glutaraldehyde concentration, crosslinking time, enzyme immobilization time were determined as 5%, 10 h and 12 h, respectively. The immobilized laccase showed a better stability resistance to temperature and pH change. Comparison of storage stabilities showed that the immobilized laccase retained more than 62.6% of its initial activity when stored at 4°C for 20 days. However, the free laccase lost most of its activity under the same conditions. The immobilized laccase retained 64.5% of its initial activity after 10 repeated batches of reaction.
研究领域:
生物技术
·
材料科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Siyuan Liu,Panfu Cai,Xiaoxi Li,Ling Chen,Lin Li,Bing Li
To improve the water vapor resistance of starch-based films, Na-MMT (Na-montmorillonite) as nanofillers were fabricated into hydroxypropyl starch and the multi-scale structural changes (including intermolecular interaction, short-range conformation, long-range ordered structure and the aggregated structure of the film) were revealed. The elongation of the water vapor molecule pathway by tortuous path is generally recognized as the main reason for the improvement of water resistance. However this study observed the lowest water vapor permeability (WVP) was at the 3% Na-MMT/hydroxypropyl starch (HPS) ratio instead of 5% even nanofillers were partially exfoliated at both ratio. Except for the “tortuous path” caused by nanofillers, this observation proposed that the short-range conformation of HPS chains, long-range ordered structure and the aggregated structure likely influenced the water barrier property. The relationship between WVP and multi-scale structure of the film was investigated. The results suggested that a good balance of short-range conformationin the amorphous region, long-range ordered structure and the aggregated structure of the film was required for the improvement of water vapor barrier property.
研究领域:
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2023
·
IF 6
Li Wu,Qijie Mo,Shoulian Wei,Ruiping Gao,Shuai Zhang,Xiaohua Zhu
This study demonstrates a novel colorimetric method for clenbuterol (CLB) detection based on the peroxidase-like activity of SiO 2 -coated Fe 3 O 4 nanoparticles (Fe 3 O 4 @mSiO 2 ) modified with montmorillonite (MMT) and sodium dodecyl sulfate (SDS), namely, Fe 3 O 4 @mSiO 2 @MMT-SDS. Fe 3 O 4 @mSiO 2 @MMT-SDS nanoparticles were prepared by modifying Fe 3 O 4 @mSiO 2 with MMT and SDS to impart negative charges to the particle surfaces. The structural properties, steady-state kinetics, catalytic performance, and reaction conditions of the as-prepared nanoparticles were analyzed. Fe 3 O 4 @mSiO 2 @MMT-SDS nanoparticles exhibited excellent dispersion and enzyme-like activity, which improved the affinity with substrate (TMB and H 2 O 2 ) for the catalytic oxidation of CLB by H 2 O 2 , turning the solution blue in the presence of the 3,3ʹ, 5,5ʹ-tetramethylbenzidine chromogen. Under optimal reaction conditions, a strong linear correlation between the absorbance of solution and CLB concentration (R 2 = 0.9983) was observed. Here, the limit of detection, spike recovery, and relative standard deviation were 9.6 × 10 -9 mol · L -1 , 94.2 %–102.2 %, and 2.2 %–4.4 %, respectively. The proposed method is a simple, fast, cost-efficient, and sensitive assay, which can be used to rapidly and accurately screen CLB in pork and animal feeds.
研究领域:
分析化学
·
食品安全
·
生物医学工程
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Chunmei Duan,Lei Han,Guanda Yang,Dirk W. Schubert,Taochuan Zhang
In this work, a highly efficient surface coating strategy using polydimethylsiloxane (PDMS) modified low-cost montmorillonite (MMT) was revealed, to enhance the surface performance and durability of magnesium substrates. Contact angle, self-cleaning, wear resistance, corrosion resistance and ultrabroadband electromagnetic absorption and EMI shielding evaluations were comprehensively studied. The obtained PDMS/MMT/Mg substrate consistently exhibited an obvious increased contact angle from 76.1 to 141.9 °, signifying strong hydrophobicity and self-cleaning properties compared to the untreated R-Mg substrate. No significant surface wettability changes were detected even after 50 times of tape peeling or 3.0 wt% NaCl solution immersion for 60 h, indicating high durability of the protective PDMS/MMT coatings. Moreover, the PDMS/MMT/Mg substrates can be applied as microwave-absorbing materials, particularly in high-frequency applications, and as excellent EMI shielding with an SE value above 40 dB. This study highlights the effectiveness of the relatively inexpensive PDMS/MMT coating in enhancing the performance of magnesium substrates, providing a new approach to balance cost control and meet performance requirements in industrial or large-scale production.
研究领域:
材料科学
·
表面工程
·
电磁干扰
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2018
·Vol. 1
·期 3
·612-623
·
IF 0
Chen Miaomiao,Zhu Jialong,Yang Baochan,Yao Xiuxiu,Zhu Xixi,Liu Qingyun,Lyu Xintian
In the present study, a facile method was proposed to prepare nickel sulfide (NiS) nanoparticles well-dispersed on the surface of montmorillonite/graphene oxide (MMT/GO). The NiS/MMT/GO nanocomposites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), fluorescence spectrophotometry, etc. Significantly, the novel NiS/MMT/GO nanocomposites exhibited high peroxidase-like activity toward the typical chromogenic substrate, 3,3′,5,5′-tetramethylbenzidine (TMB). However, glutathione (GSH) could inhibit the peroxidase-like activity of NiS/MMT/GO along with a visible color variation. Based on the color change of the system of nanocomposites-H 2 O 2 -TMB, a novel colorimetric sensor was designed and conveniently used to quantitatively detect H 2 O 2 as well as GSH. The limit of detection (LOD) of H 2 O 2 and GSH is 9.73 and 0.5043 μM, respectively. The proposed H 2 O 2 sensor has potential application in the field of biosensing, food, and environment.
ᅟ
研究领域:
纳米材料
·
生物传感器
·
分析化学
✓ 已验证
产品关联
DOI
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Tengfei Cai,Fangzheng Li,Chen Qian,Chen Shi,Jian Han
The mismatch of flame retardancy and mechanical properties is still a challenge for developing high-performance epoxy resin (EP) and its aramid fiber (AF) composite. In this study, bi-DOPO compound (ABD) was prepared by reacting DOPO with acrolein, Na-MMT was modified by octadecyltrimethylammonium chloride to prepare organic MMT(@MMT), and finally, ABD-@MMT nano-flame retardant was prepared by using ABD to intercalate @MMT to solve this problem. After introducing ABD-@MMT into AF/EP composites, it exhibited good thermal stability, excellent flame retardancy, and enhanced mechanical properties. The intercalation and exfoliation of the @MMT layer within the ABD and EP matrix indicated a uniform dispersion of the flame retardant. Especially for the sample of 3%ABD-@MMT/AF/EP composites, the limiting oxygen index (LOI) value increased from 23.8% to 34.7% accompanied by the V-0 rating in the UL-94 test. Scanning electron microscopy (SEM) analysis of residual carbon postcone calorimetry test and the degree of graphitization after muffle calcination supported the superior flame retardant properties of ABD-@MMT nanocompounds. Furthermore, the tensile strength of 3%ABD-@MMT/AF/EP composites measured at 38.3 MPa, representing an 8.5% increase compared to 3%ABD/AF/EP, only decreased by 7% compared to pure AF/EP composites. The incorporation of ABD-@MMT improved both the burning behavior and mechanical properties of the composite, reflecting reduced burning intensity, increased tensile strength, and impact strength. This study presents a novel approach for developing AF/EP composites with enhanced mechanical strength and flame retardancy.
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
危险品化学品经营许可证（带存储）