JOURNAL OF POLYMER ENGINEERING
·
2022
·Vol. 42
·期 9
·885-898
·
IF 1.624
Yadi Zhang,Chengcong Wang,Lijuan Zhang,Jianghuan Shi,Haikuan Yuan,Jie Lu
Multiwall carbon nanotubes (MWCNTs) are often used to modify polymer membranes as additives, however, MWCNTs are easy to agglomerate and entangle in polymer matrix due to their own strong van der Waals force. MWCNTs were doubly modified by bonding octadecylamine (ODA) and SiO 2 through the respective amidation and esterification reactions to prepare SiO 2 -MWCNT-ODA nanocomposites. The amino groups on ODA were amidated with the carboxyl groups on MWCNT-COOH. Then the hydroxyl groups on SiO 2 were bonded to MWCNT-COOH through esterification to obtain SiO 2 -MWCNT-ODA nanocomposites. PES/SiO 2 -MWCNT-ODA composite ultrafiltration (UF) membrane was prepared by non-solvent induced phase separation (NIPS) method. SiO 2 -MWCNT-ODA nanocomposites and PES/SiO 2 -MWCNT-ODA membrane were characterized by FTIR, XRD, TGA, and SEM, etc. The results showed that PES/SiO 2 -MWCNT-ODA membrane had significantly improved permeability, rejection, and antifouling properties for comparison with PES membrane. The pure water flux of PES/Nano.2-0.5 reached 212.5 L m −2 h −1 , which was approximately 2.6 times than that of PES membrane, and the rejection of BSA protein for composite membrane was as high as 94.2%. PES/SiO 2 -MWCNT-ODA composite membrane had excellent antifouling performance and the flux recovery rate ( FRR ) of PES/Nano.2-0.5 membrane could still maintain at higher value of 84.82% after two cycles in the antifouling test.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
DOI
高影响因子
Current Nanoscience
·
2021
·Vol. 17
·期 1
·151-161
·
IF 1.824
Wang Yong,Guan Jiju,Wang Jia,Feng Bohua,Xu Xuefeng
Background: Multi-walled carbon nanotubes (MWCNTs) were filled with dialkyl pentasulfide (DPS) to prepare MWCNTs-DPS composite (nanocomposite) additives for use in nanofluid- based machining. Methods: The nanocomposite was prepared by employing a liquid phase wet chemistry method,
and was then added in pure water with a surfactant to form the nanofluids. The present study comprehensively reveals the effects of additive concentration, acid treatment time, testing temperature and electrowetting conditions on the electrical conductivity and wettability of nanofluids.
Results: The nanocomposite was successfully produced with a maximum filling rate of 27.4%. Its additives displayed an optimal performance at a concentration of about 0.1%. Consequently, the electrical conductivity and wettability of the nanofluids were increased by over 13.7% and 6.35%, respectively
in comparison with individual MWCNTs additives. Under the electro-wettability conditions, the wetting performance of the nanofluids produced by the nanocomposite increased with the increase in charging voltage. Moreover, due to higher conductivity and greater charge capacity, the nanofluids
with a higher additive concentration displayed better wetting performance. Conclusion: The modification and filling enhanced properties such as the surface activity, electrical conductivity and capacitance of the MWCNTs, thereby improving the performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 10
·13941-13947
·
IF 2.478
Liu Ying,Cao Bo,Zhang Xu,Luo Rong,Luo Chunhua,Lin Hechun,Peng Hui
Layered Co(OH) 2 has been regarded as a potential candidate for pseudocapacitor electrode material, but it is limited by its poor conductivity and low surface area. Herein, carbonated multi-walled carbon nanotubes (MWCNTs-COOH) were used to improve the conductivity of α-Co(OH) 2 nanocomposites. α-Co(OH) 2 nanoflowers were successfully grown and tangled with MWCNTs-COOH to form a randomly oriented network structure mediated by ammonia using water-methanol as co-solvent at room temperature. The capacitance performances of the obtained α-Co(OH) 2 @MWCNT-COOH composites were investigated to find that MWCNT-COOH improved the specific capacitance efficiently. Especially, in the presence of 20% in mole of MWCNT-COOH, the composite gave rise to the high specific capacitance of 1027 F/g at the current density of 2 A/g with good cycle stability, whose specific capacitance remained 78% of its original even after 5000 cycles at 30 A/g current. The large surface area and strengthening the conductivity of the composites lead to the improvement of efficiency in charge/discharge process.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 12
·1-15
·
IF 2.6
Wang Ziyu,Shi Gege,He Yanyang,Wu Ranran,Hu Yufang,Wang Sui,Mao Jie
Annealing is a heat treatment process for materials. In this study, a conductive hydrogel was synthesized by a one-pot method using three raw materials: polyvinyl alcohol(PVA), carboxylated carbon nanotubes(Multi-Walled Carbon Nanotubes-COOH, MWCNTs-COOH) and polyethyleneimine (PEI). Based on the traditional freeze-thaw method for the preparation of PVA-based hydrogels, the annealing treatment was further added here to enhance the mechanical properties and fatigue resistance of the hydrogels. The synthesized conductive hydrogels were annealed in oven at different temperatures for a certain time, and the optimized experimental conditions and results were: the mechanical properties of the conductive hydrogel were best improved under the condition of 100 ℃-20 min, with the ultimate stress of 30.8 MPa and toughness as high as 779.58 MJ/m 3 . A high-strength, fatigue-resistant conductive hydrogel was successfully prepared, and its mechanical properties far exceeded those of other conductive hydrogels. Through a series of tests such as X-ray powder diffraction (XRD) and scanning electron microscopy (SEM), it was found that annealing promotes the orderly arrangement of PVA chains and crystallization through high temperatures, so as to enhance the mechanical properties of hydrogels. As a relatively simple and inexpensive annealing post-treatment technique, it is expected to be more widely used in improving the mechanical properties of hydrogels.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2024
·
IF 4
Mengjie Li,Wei Jiang,Yun Lin,Changhui Li,Xue Liu,Qiongzhen Liu,Wenwen Wang,Liyan Yang,Yuedan Wang,Dong Wang
Electrochromic fabric was formed by interfacial polymerization of polyaniline (PANI) and multi-walled carbon nanotubes (MWCNTs) on the surface of cotton cloth. The morphology and properties of the composite films were controlled by changing the content of multi-walled carbon nanotubes. The electrochromic properties of the fabric and its application in the field of near-infrared thermal shielding were studied. It is found that the electrochromic fabrics with MWCNTs have better electrochemical and color-changing properties. Electrochromic fabrics achieve color changes from light yellow to yellow-green to dark green in the voltage range of −1.0–1.2 V, and maintain a fast color switching time (2.15 s for coloring, 1.89 s for bleaching) after 600 cycles. The reflection contrast (ΔR) at 500 nm is 23.01 %. Moreover, the electrochromic devices are assembled with fabrics. The device has obvious discoloration and good bending stability. In addition, the thermal shielding is realized by using their reflection characteristics in the visual-near-infrared region. The results show that the electrochromic device has a low surface temperature at different environmental condition, and the thermal reduction from the original state to the bleached state is up to 3.8 ° C, indicating the potential application of the device in thermal regulation.
研究领域:
材料科学
·
电化学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·Vol. 24
·期 10
·16032-16039
·
IF 4.3
Shuai Wang,Fei Liu,Ragini Singh,Bingyuan Zhang,Santosh Kumar
Alkaline phosphatase (ALP) is a phosphomonoesterase used to hydrolyze biologically active molecules containing phosphate ester groups. Many tissues, such as bone, liver, and kidney, contain ALP; 2,4-dichlorophenoxyacetic acid (2,4-D) inhibits the reaction of ALP with phenyl phosphate. Based on the localized surface plasmon resonance (LSPR) phenomenon, a WaveFlex biosensor is designed and manufactured using multiwalled carbon nanotubes (MWCNTs)/cerium dioxide nanorods (CeO2-NRs)-immobilized multitapered fiber for detecting pesticide residues. Specifically, first, gold nanoparticles (AuNPs) are attached to the surface of the sensing region of the probe, which effectively stimulates the LSPR phenomenon. Second, MWCNTs and CeO2-NRs are fixed to the surface of the sensing region of the probe, and finally, ALP is uniformly used at a concentration of 300 IU/L. In this experiment, the authors tested the stability, repeatability, pH effect, and selectivity of the biosensor and found that it exhibits high sensitivity, good stability, and strong usability in the linear range of 0–8 mg/L, meeting the requirements for pesticide residue detection in agricultural food crops.
研究领域:
生物化学
·
农业科学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2026
·
IF 3.2
Kun Li,Shuolei Wang,Zhongyi Qiu,Xuehao Feng,Zhixing Ge,Shuxiang Cai,Wenguang Yang
A PNIPAM/MWCNTs composite hydrogel-based photo-magnetic variable-pitch soft propeller robot is fabricated. • Bis/PNIPAM ratio balances mechanics and thermo-swelling, 90° bending in 1.35 s. • 140° directional hydrogel deformation via rigid layer regulation and 55 °C pre-dehydration. • Three-bladed robot achieves full ink mixing in 23 s. We developed a photo-magnetically actuated soft propeller robot with variable-pitch capabilities specifically for microfluidic manipulation. The device is constructed from a PNIPAM/MWCNT composite hydrogel integrated with magnetic components. Its ternary structure successfully decouples magnetic rotational drive from photothermal pitch adjustments. Material optimization using 20% to 30% ethanol volume, 0.3 mm thickness, and a balanced crosslinker ratio ensured robust mechanical strength and thermo-responsive swelling. Leveraging rapid photothermal conversion, the hydrogel achieved a 90° bend in 1.35 s, and up to 140° of directional deformation when constrained by a pre-dehydrated rigid layer. Hydrodynamic evaluations showed that a three-bladed design surpassed a two-bladed alternative in both ascending efficiency and fluid flow stability. The robot achieved complete microfluidic mixing in just 23 s, outperforming conventional single-mode hydrogel propellers by 1.2 to 2.0 times. Ultimately, this comprehensive study provides a robust theoretical and experimental framework for successfully deploying photo-magnetically coupled soft robots in complex microenvironments.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Runfeng Zhang,Yan Zhang,Hai Yu,Zongmao Lv,Jie Liu,Xiaogang Luo,Xuejing Zheng,Keyong Tang
A rationally designed MWCNT-COO-MXene/PNIPAM-PAM bilayer hydrogel actuator. • Covalent heterostructure enables rapid photothermal actuation and self-sensing. • Excellent mechanical strength and reversible biomimetic shape-morphing. • An integrated device couples NIR-driven motion with real-time resistance feedback. Stimulus-responsive hydrogels hold great potential in soft robotics, yet conventional PNIPAM hydrogels are limited by slow response speed, single functionality, and poor mechanical strength. Introducing photothermal fillers such as MXene and carbon nanotubes (CNTs) is an effective strategy to enhance their performance. However, conventional physical blending results in weak interfacial interactions, filler aggregation and limited performance enhancement. Here, we address this challenge by constructing a covalent MWCNTs-COOH@MXene heterostructure via EDC/NHS-mediated esterification, which serves as an efficient conductive and thermal network within the PNIPAM matrix and is firmly integrated with the polyacrylamide (PAM) passive layer through interfacial interpenetration. Compared with the physically blended counterpart, the covalently bonded hydrogel exhibits significantly enhanced thermal conductivity (1.49 W/(m·K)) and higher photothermal conversion efficiency (45.03%). The bilayer actuator exhibited rapid and reversible bending with a response time of 10 s, reaching a maximum bending angle of 420° under thermal stimulation and 80° under NIR light. The actuation amplitude could be controlled by adjusting the thickness ratio of the layers, temperature, and light parameters. Leveraging the efficient photothermal conversion and internal heat conduction of the MWCNTs-COOH@MXene heterostructure, the hydrogel achieved fast light-driven deformation and enabled biomimetic applications such as flower-like opening/closing, target grasping, and autonomous swimming. By integrating actuation and sensing functions, an NIR-light-controlled switch was realized that performed photomechanical actions while providing real-time state feedback through resistance monitoring. This work provides a new material platform and design strategy for high-performance soft robots and intelligent actuators with integrated functionalities. Download: Download high-res image (420KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Wen-kui Li,Juan Chen,Hai-xia Zhang,Yan-ping Shi
A novel, efficient, and high-selectivity magnetic solid-phase extraction (MSPE) adsorbent based on Fe 3 O 4 nanoparticles , hydroxylated multi-walled carbon nanotubes (MWCNTs-OH) and metal-organic frameworks (MOFs) was prepared and applied for trace aromatic acids determination in solid samples by applying a template-free in situ strategy. The morphology, configuration and magnetic behavior of the adsorbent were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectra, and vibrating sample magnetometer (VSM). The adsorbent can achieve the selective extraction of aromatic acids from the aromatic mixture in apple samples, which was mainly promoted by intermolecular hydrogen bonding and π-π electron-donor-acceptor (EDA) interaction. The potential application of the adsorbent was evaluated by MSPE of trace 1-naphthylacetic acid (NAA), cinnamic acid (CA) and terephthalic acid (TPA) from apple samples under the optimal conditions which were investigated. Satisfactory linearities were obtained in a range of 5–500 ng/g and the recoveries of three aromatic acids at three spiked levels ranged from 91.2% to 98.0% with the relative standard deviations (RSD) of less than 5.5%. The limits of detection (LODs) for CA, TPA and NAA were 0.17, 0.61, and 0.86 ng/g. The satisfactory results confirmed the great potential of the novel adsorbent for the selective extraction of aromatic acids from complex sample matrices.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Lei Wang,Zhaojin Lu,Zhiwen Wang,Longyao Pei,Zhiwei Pang,Jihao Qi,Xin Chen,Jin Sha,Zhishan Bai
Impurities such as residual metal catalysts and amorphous carbon in pristine multi-walled carbon nanotubes (MWCNTs) hinder their dispersibility and conductivity in aqueous media, thereby limiting their application in conductive hydrogels. Here, we report a polyvinylpyrrolidone (PVP)-assisted Fenton method for efficient removal of impurities, and systematically investigate the influence of PVP doping on surface characteristics and dispersion stability in water. Optimal purification, achieved with 10wt% PVP, establishes a stable non-covalent coating that effectively eliminates impurities and markedly improves aqueous dispersibility. Incorporating 0.3wt% of these purified MWCNTs into a Polyacrylamide-Poly (2-acrylamido-2-methylpropanesulfonic acid)/Poly(3,4-ethylenedioxythiophene)/Poly(styrenesulfonate) conductive hydrogel matrix yields a material with significantly enhanced performance: tensile strength (151.81kPa), elongation at break (1595%), toughness (1.73MJ/m³), and compressive strength (254.3kPa) are increased by 11.58% compared to pristine MWCNT-containing hydrogels, while electrical conductivity reaches 2.85 S/m, representing a 13% improvement. This PVP-assisted Fenton purification strategy substantially enhances the functional performance of MWCNTs, enabling the development of high-performance conductive hydrogels with strong potential for flexible strain-sensing applications.
研究领域:
材料科学
·
纳米技术
·
高分子化学
·
生物医学工程
·
柔性电子器件
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2017
·Vol. 218
·期 23
·1700357
·
IF 2.5
Zijian Wu,Sheng Gao,Lei Chen,Dawei Jiang,Qian Shao,Bing Zhang,Zhaohui Zhai,Chen Wang,Min Zhao,Yingyi Ma,Xiaohong Zhang,Ling Weng,Mingyan Zhang,Zhanhu Guo
With unique physicochemical properties, multiwalled carbon nanotubes (MWCNTs) have enabled major achievement in polymer composites as reinforcing fillers. Nevertheless, high conductivity of raw MWCNTs (R-MWCNTs) limits their wider applications in certain fields, which require outstanding thermal conductivity, mechanical, and insulation properties simultaneously. In this article, silica (SiO 2 ) coated MWCNTs core–shell hybrids (SiO 2 @MWCNTs) and organically modified montmorillonite (O-MMT) are employed to modify epoxy (EP) simultaneously. The epoxy-clay system is cured by using anhydride curing agent. The impact strength and flexural strength of final nanocomposites are greatly improved. Meanwhile, the final composites remain in high electrical insulation. Compared to mixed acid treated MWCNTs (C-MWCNTs) (0.5 wt%)/EP nanocomposites, the volume resistivity of the O-MMT(4 wt%)/SiO 2 @MWCNTs(0.5 wt%)/EP nanocomposites increases more than six orders of magnitude. Synergistic toughening effect occurs when using core–shell SiO 2 @MWCNTs and MMT bifillers. The electrical insulation is attributed to the suppressed electron transport effect by SiO 2 layer on the CNTs surface, and the blocked conductive CNTs network by the buried 2D structural O-MMT. The SiO 2 @MWCNTs core–shell hybrids also benefit to decrease the dielectric constant and dielectric loss of CNTs/EP composites. This work provides guidance to using CNTs as reinforcement fillers to toughen the polymers for electric insulating applications.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Alaaddin M.M. Saeed,Gui-Ping Cao,Mustapha Sani Shehu,Ahmed S. Al-Fatesh,Salwa B. Alreshaidan,Tahani Saad Algarni,Hui Lv,Xin-Yi He,Chun-Xue Wang,Shao-Kang Qian
Bimetallic catalysts have emerged as promising materials due to their versatile applications in energy conversion, catalysis, sensing, and biomedical fields. In this study, a series of Rh Pt bimetallic nanocatalysts supported on multi-walled carbon nanotubes (RhPt x /MWCNTs) were synthesized for the efficient hydrogenation of K-Resin. Catalysts with varying Rh-to-Pt molar ratios (1:1 to 1:5) exhibited superior catalytic activity compared to their monometallic counterparts. Structural and surface analyses using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed the formation of a face-centred cubic structure and demonstrated electronic interactions between Rh and Pt through binding energy shifts. High-resolution transmission electron microscopy (HRTEM) showed well-dispersed RhPtx nanoparticles anchored on the MWCNTs. The catalysts also exhibited mesoporous characteristics and excellent thermal stability. Hydrogenation performance tests revealed that RhPtx/MWCNTs provided high conversion efficiency, stability, and recyclability. The enhanced activity is attributed to improved active site accessibility and reduced diffusion limitations enabled by the porous bimetallic structure. Complete hydrogenation of K-Resin was verified by 1 H NMR, 13 C NMR, and FTIR spectroscopy. Thermogravimetric analysis (TGA) showed that the hydrogenated product (HK-Resin) possesses greater thermal stability than the original K-Resin. Differential scanning calorimetry (DSC) analysis indicated a crystallization enthalpy (ΔHc) of −10.82 J /g, a melting enthalpy (ΔHm) of 7.1 J /g, and a crystallinity of 2.42 %, confirming the improved thermal properties of HK-Resin.
✓ 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）