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Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems最新文献

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Performance of carbon nanotubes (CNTs) on the development of radiating hybrid nanofluid flow through an stretching cylinder 碳纳米管(CNTs)对辐射混合纳米流体在拉伸圆柱体中流动的影响
Subhalaxmi Dey, Surender Ontela, Pradyumna Kumar Pattnaik, Satyaranjan Mishra
In various industries, one of the important aspects is the cooling processes for which the material exhibits its perfect shape and size. Intending to the aforementioned property the current investigation leads to carry out the features of the materialistic property of thermal radiation and the dissipative heat by incorporating these in the water-based hybrid nanofluid. The fluid past a stretching cylinder embedded with a permeable medium and the impact of the magnetic field, and thermal radiation are depicted in momentum and energy profiles. In addition to that, the role of the Hamilton-Crosser conductivity model for the behavior of various shapes of the carbon nanotube (CNT) nanoparticles with their volume concentration is also vital. The transformation of the dimensional form of the governing equations into the non-dimensional form is obtained with the use of proper transformation rules. Further, the proposed designed model is handled by employing the traditional shooting-based Runge-Kutta fourth-order technique. The significant properties of different components are deployed graphically and the validation with earlier study shows a good correlation. Moreover, the important characteristics of the outcomes are; the surface cooling, driven by increased thermal buoyancy, promotes fluid velocity while simultaneously influencing the curvature parameter and profile to slow down the accumulation of nanoparticles.
在各种工业中,一个重要的方面是冷却过程,在冷却过程中材料表现出完美的形状和尺寸。针对上述性质,本研究试图将热辐射和耗散的物质性质结合到水基混合纳米流体中。流体通过嵌入渗透性介质的拉伸圆柱体以及磁场和热辐射的影响,在动量和能量剖面中进行了描述。除此之外,Hamilton-Crosser电导率模型对不同形状的碳纳米管(CNT)纳米颗粒的行为及其体积浓度的影响也至关重要。利用适当的变换规则,将控制方程的量纲形式转化为无量纲形式。此外,所设计的模型采用传统的基于射击的龙格-库塔四阶技术进行处理。不同成分的重要性质用图形表示,与前期研究的验证显示出良好的相关性。此外,结果的重要特征是;在热浮力增加的驱动下,表面冷却提高了流体速度,同时影响了曲率参数和剖面,从而减缓了纳米颗粒的积累。
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引用次数: 0
Optimizing compressive mechanical properties and water absorption of polycaprolactone/nano-hydroxyapatite composite scaffolds by 3D printing based on fused deposition modeling 基于熔融沉积建模的3D打印聚己内酯/纳米羟基磷灰石复合支架压缩力学性能和吸水性能优化
Behnam Akhoundi, Yasser Taghipour Lahijani, Vahid Modanloo
This research examines the mechanical properties and water absorption of polycaprolactone (PCL) scaffolds reinforced with nano-hydroxyapatite (N-HA) particles, printed using a 3D printer based on fused deposition modeling (FDM) technology. Fabricating this composite material aims to replicate a tissue similar to bone tissue. Biocompatible N-HA (50% by weight) was utilized to fortify the matrix phase and enhance the mechanical properties. The compression test results showed that the addition of N-HA augmented the compressive strength and modulus of the scaffolds (with a nominal porosity of 60% and a filling pattern of 0/60/120) by 240% and 150%, respectively. Moreover, the water absorption increased by 600%.
本研究利用基于熔融沉积建模(FDM)技术的3D打印机,研究了纳米羟基磷灰石(N-HA)颗粒增强聚己内酯(PCL)支架的力学性能和吸水性。制造这种复合材料的目的是复制类似骨组织的组织。生物相容性N-HA(重量比50%)用于强化基质相和提高力学性能。压缩试验结果表明,N-HA的加入使支架(名义孔隙率为60%,填充模式为0/60/120)的抗压强度和模量分别提高了240%和150%。吸水率提高了600%。
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引用次数: 0
Effectiveness of silver-magnesium oxide-water hybrid nanofluid in Couette channel 银-氧化镁-水混合纳米流体在Couette通道中的有效性
Chandra Shekar Balla, Khasim Ali, Yendlapally Rajashekhar Reddy
The present article numerically investigates the unsteady magnetohydrodynamic (MHD) Couette flow containing novel (Ag + MgO)-water hybrid nanofluid (HNF). The nanoparticles of silver (Ag) and magnesium oxide (MgO) are supplemented to base fluid water. The top wall is kept in uniform motion while the bottom wall of channel set stationary and stretchable. An external magnetic field is applied perpendicular to lower plate. The governed nonlinear partial differential equations (PDE) are solved employing finite difference method (FDM). The effects of hybrid nanofluid and nanofluid (NF) are compared for the significant parameters and presented graphically. The results illustrate that (Ag + MgO)-water HNF exhibits significant influence over Ag-water NF on velocity and temperature in the Couette channel.
本文对含新型(Ag + MgO)-水混合纳米流体(HNF)的非定常磁流体动力学(MHD) Couette流动进行了数值研究。将银纳米粒子(Ag)和氧化镁纳米粒子(MgO)补充到基础流体水中。顶壁保持均匀运动,而槽底壁固定并可拉伸。垂直于下板施加外磁场。采用有限差分法对非线性偏微分方程进行求解。比较了混合纳米流体和纳米流体(NF)对重要参数的影响,并给出了图形。结果表明,(Ag + MgO)-水HNF对Couette通道内的流速和温度有显著影响。
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引用次数: 0
Adsorption investigation of a composite of metal-organic framework and polyethylene oxide hydrogel 金属有机骨架与聚氧化物水凝胶复合材料的吸附研究
E. B. AttahDaniel, E. Dikio, N. Ayawei, D. Wankasi, F. Mtunzi, P. N. Diagboya
Though adsorption techniques are eco-environmentally friendly, most lack the effectiveness of complete contaminant elimination leading to increasing concerns about the presence of aqueous contaminants on humans. Thus, synergistic combination of low adsorption capacity adsorbents may be an effective method to enhance their aqueous contaminant uptake. Sol-gel synthesized lanthanum-1,4-benzene dicarboxylate metal organic framework (LaBDC MOF) and polyethylene oxide (PEO) hydrogel were combined to prepare a synergistic composite adsorbent (PEO-LaBDC) for aqueous methylene blue (MB) adsorption. Major properties of the pristine LaBDC MOF and PEO hydrogel were expressed in the characterized composite indicating successful preparation. PEO-LaBDC composite MB removal rate of MB was at least twice as fast (60 min) to those of the pristine LaBDC MOF (120 min) and PEO hydrogel (125 min). The fitting of kinetics model was fractal in nature, and optimum adsorption was on the alkaline end of the pH spectrum for all adsorbents (pH = 12, 10, and 10, respectively). Comparatively, the composite exhibited a better adsorption performance of ≈177% higher than the pristine LaBDC MOF; buttressing the idea that synergistic combination of adsorbents in composites could enhance adsorption processes. Therefore, the PEO-LaBDC composite is a promising adsorbent for the remediation of aqueous MB.
虽然吸附技术是生态环境友好的,但大多数技术缺乏完全消除污染物的有效性,导致人们越来越担心水中污染物对人体的影响。因此,低吸附容量吸附剂的协同组合可能是提高其含水污染物吸收率的有效方法。将溶胶-凝胶合成的镧-1,4-苯二甲酸盐金属有机骨架(LaBDC - MOF)与聚氧聚乙烯(PEO)水凝胶相结合,制备了一种吸附亚甲基蓝(MB)的协同复合吸附剂(PEO-LaBDC)。原始LaBDC MOF和PEO水凝胶的主要性能在表征的复合材料中得到表达,表明制备成功。PEO-LaBDC复合材料对MB的去除率(60 min)至少是原始LaBDC MOF (120 min)和PEO水凝胶(125 min)的两倍。动力学模型呈分形拟合,各吸附剂在pH = 12、10和10的碱性端均有最佳吸附。与原始的LaBDC MOF相比,复合材料的吸附性能提高了约177%;支持复合材料中吸附剂的协同组合可以增强吸附过程的观点。因此,PEO-LaBDC复合材料是一种很有前途的水溶性MB修复吸附剂。
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引用次数: 0
Optimization and fuzzy model for evaluation of mechanical and tribological properties of Al-CNT-Si3N4 based nano and hybrid composites Al-CNT-Si3N4基纳米复合材料力学与摩擦学性能的优化与模糊模型评价
R. Ambigai, S. Prabhu
Silicon Nitride (Si3N4) has an extraordinary combination of high hardness, strength, toughness, and advanced properties like excellent wear and corrosion resistant, thermal shock resistance. Also, Carbon Nano Tube (CNT) has grasped interest among the researchers owing to its superior mechanical and thermal properties. Hence, the present study intents to fabricate Al matrix reinforced with Si3N4 nano particulate and Al matrix reinforced with CNT and Si3N4 particulate called hybrid composite via gravity casting route. The fabricated composites were tested for compression test, hardness and tribological test. The L9 orthogonal array was selected to conduct the tribological test in dry sliding conditions. Furthermore, SEM, an optical microscope, and image analysis tools were used to characterize the created composites. To determine the ideal operating conditions of the tribology test, analysis of variance was performed. The correlation between the input parameters and the wear rate, COF, was established using regression models. In order to predict the rate of wear with greater than 95% accuracy, a fuzzy model was developed based on the experimental data.
氮化硅(Si3N4)具有高硬度,高强度,高韧性和先进性能的非凡组合,如优异的耐磨,耐腐蚀,抗热震性。此外,碳纳米管(CNT)由于其优异的机械和热性能而引起了研究人员的兴趣。因此,本研究拟采用重力铸造的方法制备纳米氮化硅颗粒增强Al基和碳纳米管和氮化硅颗粒增强Al基,称为杂化复合材料。对制备的复合材料进行了压缩试验、硬度试验和摩擦学试验。选择L9正交阵列进行干滑动条件下的摩擦学试验。此外,利用扫描电子显微镜、光学显微镜和图像分析工具对所制备的复合材料进行了表征。为了确定摩擦学试验的理想操作条件,进行了方差分析。利用回归模型建立了输入参数与磨损率(COF)之间的相关性。为了以大于95%的准确率预测磨损率,在实验数据的基础上建立了模糊模型。
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引用次数: 0
Structure and thermal behaviour of different concentration PEG loaded PVA nanofibers 不同浓度聚乙二醇负载聚乙烯醇纳米纤维的结构和热性能
Archana Nigrawal, N. Chand, Arun Kumar Sharma, F. Haque
Poly vinyl alcohol (PVA) has established its credibility in the fields of filtration, biomedical and pharmaceutical areas. In this paper different concentration of poly (ethylene) glycol were added to PVA to prepare gel and its nano fibres. PEG is water soluble similar to PVA can give a uniform gel and a strong intermolecular bonding can be achieved by the addition of PEG in PVA. Fibres were prepared by having high wt.% of PEG loaded PVA nano fibres. Nano fibre mat having 0, 0.2,0.4 and 0.6 g PEG having low molecular weight was added in the 8.6 wt.% PVA solution and then fibres were prepared by using electro spinning technique. Nano fibres so prepared were characterised by SEM, XRD and DSC. SEM results reveal that increase of PEG concentration separated the nano fibres and increased the gap of the mesh size. SEM micro graphs depicts that produced nano fibres are homogenous in nature and there were no apparent gap between the PVA and PEG nano fibre. It may be explained that due to the high electric potential developed during the electro spinning process which helped the nano fibres to get stretched XRD patterns exhibited the crystal size increased on adding PEG in the PVA gel. Effect of PEG addition on Tm of PVA nano fibres has been determined by running their DSC scans. An additional peak of 158.13°C is observed for the sample having 0.4 g PEG. Melting temperature shifted from 215° C to 219°C due to increase in crystal size of PEG added PVA nano fibres.
聚乙烯醇(PVA)在过滤、生物医学和制药领域已经建立了信誉。本文在聚乙烯醇中加入不同浓度的聚乙二醇,制备凝胶及其纳米纤维。与PVA类似,PEG是水溶性的,可以形成均匀的凝胶,在PVA中加入PEG可以实现很强的分子间键合。采用高wt %的聚乙二醇负载聚乙烯醇纳米纤维制备纤维。纳米纤维垫有0,0.2,0.4和0.6克低分子量的聚乙二醇被添加到8.6吨。采用静电纺丝技术制备% PVA溶液和纤维。用SEM、XRD和DSC对制备的纳米纤维进行了表征。SEM结果表明,聚乙二醇浓度的增加使纳米纤维分离,网孔间距增大。SEM显微图显示,制备的纳米纤维性质均匀,PVA和PEG纳米纤维之间没有明显的间隙。这可能是由于静电纺丝过程中产生的高电位有助于纳米纤维的拉伸,XRD图显示,在PVA凝胶中加入PEG后,纳米纤维的晶粒尺寸增大。通过DSC扫描确定了聚乙二醇对PVA纳米纤维Tm的影响。对于含有0.4 g PEG的样品,观察到158.13°C的附加峰。由于加入PVA纳米纤维的PEG晶粒尺寸增大,熔融温度从215℃升高到219℃。
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引用次数: 0
Surface and crack effects on longitudinal vibration of thick nanorods with various boundary conditions 不同边界条件下,表面和裂纹对粗纳米棒纵向振动的影响
H. Shokrollahi, R. Nazemnezhad
Considering the effect of surface parameters and crack on the longitudinal vibration of nanorods is the aim of this study. The nanorod is assumed to be thick, and it is modeled based on Bishop theory of rods. In thick nanorods, the effects of the inertia of lateral motions and the shear stiffness are considered in the kinetic energy and the strain energy of the nanorod, respectively. In the present study, the crack is modeled as a linear spring in which its stiffness is related to the crack severity. The surface parameters considered are the surface Lamé constants, the surface density, and the surface stress. Considering all surface parameters causes inhomogeneity of governing equations and boundary conditions. After converting inhomogeneous equations to homogeneous ones, the resulted equations are solved numerically. All possible boundary conditions are introduced but only natural frequencies of nanorod with fixed-fixed and fixed-free are reported. In addition to considering the effect of type of boundary conditions on the natural frequencies, the effect of geometrical parameters like radius and length, and mode number is also considered. The results are presented for both thin and thick nanorods to compare the effect of various parameters especially surface parameters on longitudinal frequencies.
考虑表面参数和裂纹对纳米棒纵向振动的影响是本研究的目的。假设纳米棒很粗,并基于Bishop棒理论对其进行建模。在厚纳米棒中,横向运动惯量和剪切刚度的影响分别考虑在纳米棒的动能和应变能中。在本研究中,将裂纹建模为线性弹簧,其刚度与裂纹严重程度相关。所考虑的表面参数是表面lam常数、表面密度和表面应力。考虑所有表面参数导致控制方程和边界条件的不均匀性。将非齐次方程转化为齐次方程,对所得方程进行数值求解。引入了所有可能的边界条件,但只报道了固定-固定和自由-固定纳米棒的固有频率。除了考虑边界条件类型对固有频率的影响外,还考虑了半径、长度、模态数等几何参数对固有频率的影响。本文给出了薄纳米棒和厚纳米棒的实验结果,比较了各种参数特别是表面参数对纵向频率的影响。
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引用次数: 0
The synthesis of cobalt nanoparticles by solution combustion synthesis method in a new reactor at low-temperature conditions 采用溶液燃烧合成法在新型反应器中低温条件下合成钴纳米颗粒
M. Barati, B. Khoshandam
The novelty of the present paper was the construction of a new reactor to synthesize the cobalt nanoparticles (NPs) by solution combustion synthesis (SCS) method for reducing the processing temperature of cobalt production. To perform the SCS process, a reactor was designed and constructed and the synthesis process was performed using cobalt (II) nitrate-6-water as oxidizer along with glycine and urea as fuels. The effect of the molar ratio of glycine fuel to oxidizer and fuel type parameters on the purity of the products were examined. The XRD and FESEM analysis were used to characterize the obtained products. Based on FESEM analysis and the Scherrer equation, the mean size of all samples was under 100 nm and the reactor loaded with the glycine fuel provided the lowest particle sizes by around 14 nm and produced particles with better surface adhesion. It was found that the glycine fuel was determined the best fuel compared to urea because of producing temperatures near 400°C. Compared to traditional gas-solid reactions, the operating temperature of this process was under 400°C which was considerably lower than the operating temperature of gas-solid reactions occurred at temperatures higher than 800°C.
本文的新颖之处在于构建了一种新的反应器,采用溶液燃烧合成(SCS)法合成钴纳米颗粒(NPs),以降低钴生产的加工温度。为了实现SCS工艺,设计并构建了反应器,并以硝酸钴(II) -6-水为氧化剂,甘氨酸和尿素为燃料进行了合成过程。考察了甘氨酸燃料与氧化剂的摩尔比和燃料类型参数对产品纯度的影响。用XRD和FESEM对所得产物进行了表征。基于FESEM分析和Scherrer方程,所有样品的平均粒径都在100 nm以下,其中负载甘氨酸燃料的反应器提供的粒径最小,约为14 nm,并且产生的颗粒表面粘附性更好。结果表明,与尿素相比,甘氨酸燃料被确定为最佳燃料,因为其生产温度接近400℃。与传统的气固反应相比,该工艺的操作温度在400℃以下,大大低于800℃以上气固反应的操作温度。
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引用次数: 0
Slip and convective flow of Williamson nanofluid influenced by Brownian motion and thermophoresis mechanism in a horizontal microchannel 受布朗运动和热泳机制影响的Williamson纳米流体在水平微通道中的滑移和对流
A. Felicita, P. Venkatesh, B. Gireesha, M. Krishnamurthy
The current work is an attempt to explicate the repercussions caused by the transmission of heat as well as mass along with the enhancement of heat transmission for a steady MHD Williamson nano-substance flowing through the microchannel with slip and convective boundary conditions. The consequence of magnetic field and viscous dissipation on the flow is recorded. The simultaneous impact of the two well-known slip-mechanisms Brownian movement and thermophoresis is elaborated explicitly. The governed non-linear systems obtained were illustrated numerically via Runge-Kutta Fehlberg 4–5th order method based on shooting scheme. The pertinent features of assorted parameters have been scrutinized with the aid of graphs. Results reveal that magnetic parameter along with buoyancy ratio parameter was observed to decline the velocity whereas Weissenberg number displays both rising and depleting conduct on velocity. Temperature was reported to boost with Brownian motion and thermophoresis parameter whereas concentration profile declines with the same. Also drag across the enclosures of the microchannel with wall heat flux are computed and studied through graphs.
目前的工作是试图解释在滑移和对流边界条件下,稳定的MHD Williamson纳米物质流过微通道时,热量和质量的传递以及传热的增强所引起的影响。记录了磁场和粘性耗散对流动的影响。明确阐述了两种众所周知的滑移机制布朗运动和热泳动的同时影响。利用基于射击格式的Runge-Kutta Fehlberg 4 - 5阶方法对得到的非线性控制系统进行了数值说明。各种参数的有关特征已借助图表加以详细研究。结果表明:磁性参数随浮力比参数的增加而降低速度,而Weissenberg数对速度的影响既有上升的也有减少的。据报道,温度随布朗运动和热泳参数的增加而增加,而浓度随布朗运动和热泳参数的增加而下降。并通过图形计算和研究了微通道壁面的热流密度。
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引用次数: 0
Radiative slip transport of magnetized gyrotactic micro-organisms submerged with nano fluid along a vertical stretching surface with suction/injection effects 纳米流体浸没磁化陀螺仪微生物沿垂直拉伸表面的吸注效应辐射滑移输运
R. Mehmood, Iqra Ali, S. Ijaz, S. Rana, E. N. Maraj
Micro-organisms play an important role in numerous conditions such as toxin release, digestion and antibiotics. These remarkable features of motile organisms can lead to bio convection phenomena. Keeping in view, the present article is focused to study the collective impact of motile organisms and nanoparticles on flow past an elastic porous surface. Thermal radiation, viscous dissipation and prescribed surface slip condition is also imposed in order to acquire physically realistic analysis. The flow governing problem is modeled using fundamental laws of momentum and energy which afterward is transformed by utilizing a suitable scaling analysis. Role of emerging sundry parameters on quantities of physical interest are portrayed graphically and discussed in a physical manner. It is observed that fluid’s velocity and temperature rises for radiation parameter but concentration of fluid drops down. Local motile density slightly enhances with Dissipation, Suction and Radiation factor while it drops down with Slip factor. When injection of fluid raised then skin friction coefficient, Nusselt number, Sherwood number and motile microorganism density also raised.
微生物在许多情况下发挥重要作用,如毒素释放,消化和抗生素。活动生物的这些显著特征可以导致生物对流现象。鉴于此,本文的重点是研究运动生物和纳米颗粒对流动通过弹性多孔表面的集体影响。为了获得物理上真实的分析结果,还施加了热辐射、粘性耗散和规定的表面滑移条件。流动控制问题采用动量和能量的基本定律进行建模,然后利用适当的标度分析对其进行转换。新出现的各种参数对物理兴趣量的作用以图形方式描绘并以物理方式讨论。观察到,随着辐射参数的增加,流体的速度和温度升高,而流体的浓度下降。局部运动密度随耗散、吸力和辐射因子的增大而增大,随滑移因子的增大而减小。随着注射液体的增加,皮肤摩擦系数、努塞尔数、舍伍德数和活动微生物密度也随之增加。
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引用次数: 1
期刊
Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems
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