RSC Advances
·
2016
·Vol. 7
·期 1
·318-326
·
IF 3.289
Pham Van Trinh,Nguyen Ngoc Anh,Bui Hung Thang,Le Dinh Quang,Nguyen Tuan Hong,Nguyen Manh Hong,Phan Hong Khoi,Phan Ngoc Minh,Phan Ngoc Hong
In this study, nanofluid based ethylene glycol (EG) containing Cu nanoparticles decorated on a Gr–MWCNT hybrid material (Gr–MWCNT/Cu) was synthesized successfully for the first time via a chemical reduction method. The SEM, HRTEM, FTIR and XRD studies revealed that Cu nanoparticles with an average diameter of 18 nm were well decorated on the surface of both MWCNTs and graphene sheets. The nanofluids containing Gr–MWCNT/Cu material showed good stability and a maximum thermal conductivity enhancement of 41% at 60 °C for the nanofluid containing 0.035 vol% material compared to EG alone. The enhancement is due to the combination of the high thermal conductivity of graphene, CNT and Cu nanoparticles as well as the higher surface area of the Gr–MWCNT/Cu hybrid structure. Experimental results of thermal conductivity were evaluated using different theoretical models, amongst which the Hamilton–Crosser model was found suitable for predicting the thermal conductivity of the nanofluid.
研究领域:
材料科学
·
纳米技术
·
热工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Qingbin Xu,Linchun Shi,Weijun Kong,Jing Wang,Peigen Xiao,Jinxin Liu
A meticulously engineered bacillus-shaped CoNi ZIF-MXene@MWCNT carbon cloth (CC) composite was synthesized through a one-step immersion method, which was employed in the development of a novel electrochemical (EC) sensor for the sensitive detection of salidroside (SAL) in Rhodiola. Characterization of the CoNi ZIF-MXene@MWCNT CC was conducted using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), and EC methods. The bacillus-shaped composite showcased an exceptionally high rate of active site exposure, superior conductivity, and electrocatalytic efficiency, attributed to the synergistic effects of the constituent materials. The remarkable electrocatalytic capability facilitated the redox reaction of SAL, marked by a significant enhancement in the current signal. This led to a concentration-dependent response enabling the quantitative detection of SAL. The mechanism of the redox reaction might be the oxidation of the phenolic hydroxyl group of SAL. Demonstrating high sensitivity, selectivity, and stability, this novel bacillus-shaped composite-based EC sensor achieved a low detection limit (LOD) of 0.0958 µ g/mL for SAL, within an effective linear range of 0.5–500 µg/mL. Importantly, the EC sensor proved to be adept at practical detection of SAL in Rhodiola samples with complex matrices, and the salidroside content of Rhodiola crenulata was much higher than that of Rhodiola rosea , indicating that Rhodiola crenulata may have a higher medicinal value, offering a promising avenue for rapid and sensitive detection of SAL.
研究领域:
电化学
·
材料科学
·
分析化学
·
药学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Temitope Fausat Ajibade,Huali Tian,Kayode Hassan Lasisi,Qiang Xue,Weihao Yao,Kaisong Zhang
Despite advances in membrane technology, the separation of complex oily wastewater using membrane filtration remains a daunting challenge for the industry. Recent approaches including membrane modification with two-dimensional (2D) nanosheets, showed susceptibility to swelling, fouling, and instability during operation. As a game-changer approach, a polyacrylonitrile (PAN) UF membrane modified with 3D nanostructured composite of MXene and O-MWCNT was introduced for the first time to treat complex oily wastewater. The composite membrane showed high separation performance of soluble dye-oil-water emulsion while maintaining high water permeability. Moreover, during the operational period, the composite membrane exhibits excellent antifouling and anti-swelling properties due to the synergetic effects conferred by the 3D nanostructures. Furthermore, the composite membrane possesses remarkable chemical stability evidenced by its high corrosion resistance when exposed to a strong acid (3 M HCl) and oxidant (NaOCl) solution for a long-time period. Overall, the operational stability was maintained in terms of flux and high rejection of oil and dye over a 45 h long-term operation. Consequently, this work provides an innovative, stable, and highly facile process for fabricating scalable UF composite membrane for the treatment of complex oily wastewater in a harsh chemical environment.
研究领域:
环境工程
·
膜技术
·
废水处理
✓ 已验证
DOI
高影响因子
ACS Applied Bio Materials
·
2021
·
IF 0
Zeying Lu,Shengwei Xu,Hao Wang,Enhui He,Juntao Liu,Yuchuan Dai,Jingyu Xie,Yilin Song,Yun Wang,Yiding Wang,Lina Qu,Xinxia Cai
In this study, a biosensor assembly based on microelectrode arrays (MEAs) modified with PtNPt/MWCNT-PEDOT:PSS nanocomposites is presented to synchronously detect the dopamine (DA) and electrophysiological activities in rat brains. Different morphological and electrochemical characterizations were conducted to show the excellent mechanical and electrical properties of the as-prepared probes. The developed biosensors realized the sensitive and selective detection of DA with the existence of significant interferences such as uric acid (UA), ascorbic acid (AA), glutamate (Glu), and 3,4-dihydroxyphenylacetic acid (DOPAC). Calibration curve for the DA response was linear with the concentration from 0.05 μM to 79 μM (R = 0.999), with a sensitivity of 30.561 pA/μM and detection limit as low as 50 nM. Finally, the proposed microelectrode was applied to be implanted into the cortex and caudate putamen (CPU) of rats, which was demonstrated to stably measure the synchronous neurochemical and neurophysiological changes caused by 72 h sleep deprivation. The in vivo measuring results showed that the sleep deprivation increased the DA release and neural spike activity in both cortex and CPU. The local field potential (LFP) power in the delta and theta band was significantly increased as well. These changes in brain may reflect the brain’s adaptive reaction toward the side effects induced by sleep deprivation and may partially explain the mechanism of forced wakefulness in the presence of accumulated sleep pressure.
研究领域:
神经科学
·
生物传感器
·
电化学
·
睡眠研究
✓ 已验证
产品关联
DOI
PubMed
COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Tingting Yu,Xiaozhou Lü,Weimin Bao
Flexible strain sensors are widely used in wearable electronic devices, sports health detection and electronic skin. These sensors have the advantages of large strain range, full flexibility and biocompatibility. However, flexible strain sensors will inevitably suffer mechanical damage during operation, resulting in degraded sensor performance and shortened life. In this paper, a high electrical self-healing flexible strain sensor (ESFSS) based on multi-walled carbon nanotubes and polydimethylsiloxane (MWCNT-PDMS) elastomer is proposed. The ESFSS is designed by the modified self-healing PDMS elastomer (SPE) that gives the ESFSS electrical self-healing ability. Moreover, the conductive filler (MWCNT) is introduced to the sensor to endow the ESFSS with high sensitivity and a wide measurement range. The matrix materials of the ESFSS are characterized, the electrical healing mechanism and sensing mechanism of the ESFSS are analyzed and the high electrical self-healing performance of the ESFSS is demonstrated with an electrical healing efficiency (EFE) of 97.8%. In addition, the proposed ESFSS also has high gauge factor (GF) values of 57.894 (0–85.36%), 993.088 (85.36%–106.64%) and 5536.346 (106.64%–136.32%) and a wide measurement range (0–136.32%). The ESFSS has a promising application in human motion detection.
研究领域:
材料科学
·
电子工程
·
生物医学工程
·
可穿戴技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2022
·Vol. 53
·期 3
·559-569
·
IF 2.925
Li Shun,Niu Airong,Lan Cuixia,Xu Xuanming,Sun Shukai,Xuan Chao,Zhao Peng,Tian Qingwu,Zhou Tingting
A novel electrochemical sensor of multi-walled carbon nanotube (MWCNT) and stearyl trimethyl ammonium chloride (STAC) modified acetylene black paste electrode (AB-PE) was successfully established. An AB/MWCNT/STAC-paste electrode was constructed using the AB electrode with MWCNT and STAC as the electrochemical sensor materials. The performance of the prepared sensor was characterized by electrochemical impedance spectroscopy and cyclic voltammetry. Some factors, such as sensor composition, adsorption, and detection conditions, which affect the property of the sensor, were investigated in detail. The results demonstrated that the prepared sensor has satisfactory selectivity, repeatability, and stability for methotrexate (MTX) detection. The linear range of the method for MTX detection was 0.02–8.0 μM with a limit of detection (LOD) of 1.81 nM. Finally, the sensor was successfully used for detecting the MTX concentrations in the samples of serum and saliva. The prepared sensor could be a fresh platform for the swift and accurate MTX detection in clinical samples. Graphical abstract
研究领域:
电化学
·
纳米技术
·
分析化学
·
临床化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2023
·
IF 2.9
Yan Xiong,Shu Zhu,Hua Zhao,Jin Li,Yanting Li,Tao Gong,Yanru Tao,Jiangling Hu,Hongmei Wang,Xinhui Jiang
For patients receiving organ transplants, monitoring the blood concentration of MPA can provide timely information on whether MPA has reached the effective therapeutic window to better function while reducing the incidence of rejection or adverse reactions. In this study, an electrochemical sensor for the detection of MPA was built using a nanocomposite made of CS-MWCNT and AuNPs. At the same time, the high performance liquid phase (HPLC) method for MPA was established and compared with this sensor. The surface morphology, structure, and roughness of the material on the electrode were characterized by scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR), and atomic force microscopy (AFM). In addition, the electrochemical behavior of the modified electrode was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The standard curve was obtained in blank plasma, not pure buffer solution. The peak current was linearly related to the MPA concentration in the linear range of 0.001–0.1 mM with a detection limit of 0.05 μM and good anti-interference ability. Moreover, the sensor was employed with success for the determination of MPA in rat plasma with good recovery. The electrochemical sensor presented here is eco-friendly, and sensitive, and offers a great possibility for practical applicability.
研究领域:
电化学
·
纳米技术
·
分析化学
·
生物医学工程
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Meizheng Li,Mengfei Luo,Jia An,Yufei Liu
Choline levels in the human body are indicative of diseases such as glioma, Alzheimer’s disease, and Parkinson’s disease, which is crucial in clinical diagnosis. Therefore, there is an urgent need for a method to detect choline that has potential clinical applications. A novel choline electrochemical biosensor based on choline oxidase was successfully developed, and its performance was significantly improved by modifying the composite of multi-walled carbon nanotubes and gold nanoparticles (MWCNT-AuNPs) and the composite of multi-walled carbon nanotubes and polyaniline (MWCNT-PANI). By combining the time–current method, the concentration of choline was determined based on the magnitude of the oxidation current, enabling trace-level detection of choline. The results showed that the modifying of nanomaterials on the electrode surface can improve both the conductivity and current response of the enzyme electrode. The choline oxidase/composite of multi-walled carbon nanotubes/composite of multi-walled carbon nanotubes and polyaniline and gold nanoparticles (ChOx/MWCNT-AuNPs/MWCNT-PANI) electrode showed a good linear response and a wide linear range to choline in the range of 0.033–133.330 μM. The results of the time–current indicated that our biosensor provided a higher sensitivity of 4.85 nA/μM and a lower detection limit of 0.025 μM (S/N = 3) for choline sensing. Furthermore, the sensor retained 90 % of the initial activity after 50 days. The results exhibited that the novel choline biosensor has the potential to be used for the clinical diagnosis of diseases and prevent disease recurrence, based on detecting the changes of choline level.
研究领域:
医学诊断
·
纳米材料
·
生物传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 48
·e56288
·
IF 2.7
Yue Sun,Jiale Zhang,Tao Chen,Yanting Zhang,Chonggang Wu,Xinghou Gong,Tao Hu
Silicone rubber (SR) is an ideal dielectric elastomer substrate due to its excellent flexibility and fast response speed. However, the innate low dielectric permittivity ( ε ) of SR generally requires a rather high driving voltage that restricts its widespread application. Typical attempts to increase ε of SR usually deteriorate either its flexibility or electrical stability. Herein, conductive multi-walled carbon nanotube (MWCNT) were first surface modified with polyphenols (PNs) (MWCNT@PNs), aiming to facilitate its well dispersion within SR matrix, which may maintain the softness and electrical stability of SR via suppressing concentrated physical crosslinking and local leakage current flow. Then, five-layered MWCNT@PNs/SR composites were prepared with the outer two insulating layers of SR while middle three dielectric layers of MWCNT@PNs filled SR. The multilayered structure further hindered the formation of conductive pathways through the composites, promising a high breakdown strength of the composites. Therefore, the multilayered MWCNT@PNs/SR composites exhibited increased ε , maintained low Young's modulus and electrical breakdown strength compared with pure SR of the same five-layered structure. Among them, the composite with uniformly distributed MWCNT@PNs (m-1: 1: 1) showed a highest actuation strain of 11.9% (at 19.6 kV mm −1 ), which was 4.1 times higher than that of SR (2.9% at 19.1 kV mm −1 ).
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
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
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
·
2021
·Vol. 116
·期 7
·2373-2385
·
IF 3.226
Guan Jiju,Ding Yunpeng,Gao Chao,Xu Zhengya,Xu Xuefeng,Wang Zhiliang
In this work, novel DPS/MWCNT composites were synthesized through filling multi-walled carbon nanotubes (MWCNTs) with dialkyl pentasulfide (DPS) using a wet-chemical method. A nanofluid that use the DPS/MWCNT composites as additives was then developed for achieving a high-performance turning. The performance of the developed nanofluid including dispersion stability, heat transfer capacity, and wettability was evaluated using thermophysical analytical methods. The machining performance of the DPS/MWCNT composites nanofluid was systematically investigated in the turning of AISI 52100 alloy steel, using a commercial emulsion coolant as a benchmark. The lubrication mechanism of the nanofluid involved in the turning process was reveal with the aid of X-ray photoelectron spectroscopy (XPS). The results showed that DPS was successfully filled into MWCNTs with a filling rate of around 25.7%. The nanofluid had an excellent dispersion performance and produced respective 105.0% and 23.6% improvements in the heat transfer and wetting performance, in comparison to a base fluid. During turning, the composites suspended in the nanofluid acted as microbearings to reduce the friction of sliding, while the DPS filled in the MWCNTs was released under pressure to generate a complex lubricating film at the tool-chip interface, leading to a low resistance to cutting. This thus resulted in 15% and 25% reductions in the cutting force and temperature as well as 16% and 22% improvements in the surface roughness and tool life, in comparison to a conventional turning.
研究领域:
材料科学
·
机械工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Dapeng Sun,Min Chen,Xin Zhang,Cigang Xu,Guoshu Zhang
Recently, membrane distillation (MD) processes using two-dimensional graphene oxide (GO) membranes exhibited good light water/deuteriated water (H 2 O/D 2 O) separation performance, which depended on membrane materials and structures. This raises the need for the development of novel membrane materials and revealing the relationship of membrane structure-separation performance to further increase separation performance. Here, one-dimensional (1D) MWCNT-based membrane was explored for the separation of H 2 O/D 2 O using the water source with specially chosen concentration of deuterium (D) in air–gap membrane distillation processes, and the resultant MWCNT membrane gave lower permeation flux and similar separation factor compared with the pristine GO membrane. Then GO-MWCNT composite membranes with different structures obtained by mixing various weight ratios of GO : MWCNTs were investigated, and their separation performance was found to be related with membrane structures. The resulted 3D hierarchical GO-MWCNT composite membrane (G/M−1:3) gave the highest permeation flux of 0.947 L·m −2 ·h −1 among all GO-MWCNT composite membranes, higher than that of the pristine GO membrane, while the separation factor of G/M−1:3 (1.045) and the pristine GO membrane (1.046) was comparable. Furthermore, the correlation of membrane structure-separation performance was reviewed. These results demonstrate the first example of MWCNT membrane and related composite membranes for H 2 O/D 2 O separation and suggest that H 2 O/D 2 O separation performance in membrane distillation processes can be improved by tailoring the structure of GO-MWCNT composite membranes. As the separation of H 2 O/D 2 O is usually used as a model in the laboratory for light water/tritiated water (H 2 O/HTO) separation process, this approach can guide for developing novel membrane materials and structures to deliver appropriate H 2 O/HTO separation processes needed in the nuclear energy field.
研究领域:
材料科学
·
核能工程
·
环境科学
✓ 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）