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  • Open Access

    ARTICLE

    CHARACTERIZATION OF THE RHEOLOGY AND CURE KINETICS OF EPOXY RESIN WITH CARBON NANOTUBES

    R. J. Johnson, R. Pitchumani

    Frontiers in Heat and Mass Transfer, Vol.1, No.1, pp. 1-9, 2010, DOI:10.5098/hmt.v1.1.3007

    Abstract Much research is currently being performed with carbon nanotube additives to neat resin systems to enhance properties such as thermal and electrical conductivity, strength, modulus and damping. Fabrication of parts based on carbon nanotube filled resin systems requires information on their cure kinetics and rheology, which has been relatively less studied so far. This work presents an extensive experimental study that systematically characterizes the cure kinetics and viscosity as a function of degree of cure and temperature of EPON 815C/EPICURE 3274 epoxy resin system laden with carbon nanotubes. Studies are conducted to determine the effects More >

  • Open Access

    ARTICLE

    Analysis of the Performances of a New Type of Alumina Nanocomposite Structural Material Designed for the Thermal Insulation of High-Rise Buildings

    Yue Yu*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.3, pp. 697-709, 2023, DOI:10.32604/fdmp.2022.021482

    Abstract The sol-gel method is used to prepare a new nano-alumina aerogel structure and the thermal properties of this nanomaterial are investigated comprehensively using electron microscope scanning, thermal analysis, X-ray and infrared spectrometer analysis methods. It is found that the composite aerogel alumina material has a multi-level porous nano-network structure. When employed for the thermal insulation of high-rise buildings, the alumina nanocomposite aerogel material can lead to effective energy savings in winter. However, it has almost no energy-saving effect on buildings where energy is consumed for cooling in summer. More >

  • Open Access

    ARTICLE

    A New Method for Developing Industrially Viable Nanocrystalline Cellulose-based Nanocomposites via Melt Compounding

    Marta Martínez-Sanz, Amparo López-Rubio, Maria José Fabra, José M. Lagaron*

    Journal of Renewable Materials, Vol.2, No.2, pp. 107-117, 2014, DOI:10.7569/JRM.2014.634106

    Abstract Due to their high crystallinity and aspect ratio, bacterial cellulose nanowhiskers (BCNW) represent an appealing choice for the development of fully biobased nanocomposite materials with high barrier performance. However, their strong tendency to self-associate, together with their highly hydrophilic character, has restricted the production of nanocomposites containing cellulose nanowhiskers by industrial processing techniques such as melt compounding. Th is article presents an overview of the latest published results carried out within our group and also in other relevant literature, which have led to the development of an effi cient strategy for the incorporation of highly… More >

  • Open Access

    ARTICLE

    Characterization of Nanocomposite Membrane Based Bacterial Cellulose Made of Pineapple Waste Reinforced by Graphite Nanoplatelets

    Heru Suryanto1,2,*, Bili Darnanto Susilo3, Jibril Maulana3, Aminnudin3, Uun Yanuhar4, Surjani Wonorahardjo2,5, Husni Wahyu Wijaya2,5, Abu Saad Ansari6

    Journal of Renewable Materials, Vol.10, No.9, pp. 2455-2465, 2022, DOI:10.32604/jrm.2022.020478

    Abstract Waste is the main problem for the environment. Handling waste for various useful applications has a benefit for the future. This work has been studied for handling pineapple peel waste to make composite film bacterial cellulose nanocomposite membrane (BCNM) with addition graphite nanoplatelet (GNP). The concentration of GNP in the membrane influence the membrane properties. The bacterial cellulose (BC) pellicle was synthesized by using media from pineapple peel waste extract. BC pellicle is cleaned with water and NaOH solution to be free from impactors. BCNM is synthesized through the mechanical disintegration stage. The results of… More > Graphic Abstract

    Characterization of Nanocomposite Membrane Based Bacterial Cellulose Made of Pineapple Waste Reinforced by Graphite Nanoplatelets

  • Open Access

    REVIEW

    An Updated Review on Low-Temperature Nanocomposites with a Special Focus on Thermal Management in Buildings

    John Paul1, K. Kadirgama1, M. Samykano2,*, R. Saidur3, A. K. Pandey3, R. V. Mohan4

    Energy Engineering, Vol.119, No.4, pp. 1299-1325, 2022, DOI:10.32604/ee.2022.019172

    Abstract

    Buildings contribute to 33% of total global energy consumption, which corresponds to 38% of greenhouse gas emissions. Enhancing building’s energy efficiency remains predominant in mitigating global warming. Advancements in thermal energy storage (TES) techniques using phase change material (PCM) have gained much attention among researchers, primarily to minimize energy consumption and to promote the use of renewable energy sources. PCM technology stays as the most promising technology for developing high-performance and energy-efficient buildings. The major drawback of PCM is its poor thermal conductivity which limits its potential use which could be resolved by dispersing conductive nanofillers.

    More > Graphic Abstract

    An Updated Review on Low-Temperature Nanocomposites with a Special Focus on Thermal Management in Buildings

  • Open Access

    ARTICLE

    Flexible Memristive Devices Based on Graphene Quantum-Dot Nanocomposites

    Sung Won Hwang, Dae-Ki Hong*

    CMC-Computers, Materials & Continua, Vol.72, No.2, pp. 3283-3297, 2022, DOI:10.32604/cmc.2022.025931

    Abstract Artificial neural networks (ANNs) are attracting attention for their high performance in various fields, because increasing the network size improves its functioning. Since large-scale neural networks are difficult to implement on custom hardware, a two-dimensional (2D) structure is applied to an ANN in the form of a crossbar. We demonstrate a synapse crossbar device from recent research by applying a memristive system to neuromorphic chips. The system is designed using two-dimensional structures, graphene quantum dots (GQDs) and graphene oxide (GO). Raman spectrum analysis results indicate a D-band of 1421 cm−1 that occurs in the disorder; band is… More >

  • Open Access

    ARTICLE

    Machine Learning-Based Predictions on the Self-Heating Characteristics of Nanocomposites with Hybrid Fillers

    Taegeon Kil1, D. I. Jang1, H. N. Yoon1, Beomjoo Yang2,*

    CMC-Computers, Materials & Continua, Vol.71, No.3, pp. 4487-4502, 2022, DOI:10.32604/cmc.2022.020940

    Abstract A machine learning-based prediction of the self-heating characteristics and the negative temperature coefficient (NTC) effect detection of nanocomposites incorporating carbon nanotube (CNT) and carbon fiber (CF) is proposed. The CNT content was fixed at 4.0 wt.%, and CFs having three different lengths (0.1, 3 and 6 mm) at dosage of 1.0 wt.% were added to fabricate the specimens. The self-heating properties of the specimens were evaluated via self-heating tests. Based on the experiment results, two types of artificial neural network (ANN) models were constructed to predict the surface temperature and electrical resistance, and to detect More >

  • Open Access

    ARTICLE

    Effect of Mixing Strategy on the Structure-Properties of the PLA/PBAT Blends Incorporated with CNC

    Deniz Sema Sarul1, Dogan Arslan2, Emre Vatansever1, Yusuf Kahraman2, Ali Durmus3, Reza Salehiyan4, Mohammadreza Nofar1,2,*

    Journal of Renewable Materials, Vol.10, No.1, pp. 149-164, 2022, DOI:10.32604/jrm.2022.017003

    Abstract Polylactide (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) blend nanocomposites including 3 wt% of cellulose nanocrystals (CNCs) were prepared by melt compounding method in a twin-screw extruder and an internal mixer. Blend nanocomposites were formulated by diluting three different masterbatches prepared by solution casting method that contained 7 wt% of CNC. These masterbatches were: (m1) PLA/PBAT/CNC masterbatch; (m2) PLA/CNC masterbatch; and (m3) PBAT/CNC masterbatch. These were to explore how different preparation methods affect the dispersion and localization of CNC and hence the properties of PLA/PBAT/CNC blend nanocomposites. Scanning electron microscopy (SEM) was used to study the structural changes… More >

  • Open Access

    ARTICLE

    Improved Thermophysical Properties of Developed Ternary Nitrate-Based Phase Change Material Incorporated with MXene as Novel Nanocomposites

    I. Samylingam1, Navid Aslfattahi2, K. Kadirgama1,*, Mahendran Samykano3, L. Samylingam4, R. Saidur4,5

    Energy Engineering, Vol.118, No.5, pp. 1253-1265, 2021, DOI:10.32604/EE.2021.016087

    Abstract In this study, nanocomposite of ternary nitrate molten salt induced with MXene is developed. LiNO3-NaNO3-KNO3 with wt% of 35:12:53 and 35:10:55 are produced and doped with MXene in the wt% of 0.2, 0.5, 1.0, and 1.5. FTIR result indicates the composites had no chemical reaction occurred during the preparation. UV-VIS analysis shows the absorption enhancement with respect to the concentration of MXene. Thermogravimetric analysis (TGA) was used to measure the thermal stability of the LiNO3-NaNO3-KNO3 induced with MXene. The ternary molten salts were stable at temperature range of 600–700°C. Thermal stability increases with the addition of More >

  • Open Access

    ARTICLE

    Green Synthesis of Silver Nanoparticles Using Plectranthus Amboinicus Leaf Extract for Preparation of CMC/PVA Nanocomposite Film

    Nguyen Thi Thanh Thuy1,*, Le Hoang Huy1, Truong Thuy Vy1, Nguyen Thi Thanh Tam2, Bien Thi Lan Thanh1, Nguyen Thi My Lan3

    Journal of Renewable Materials, Vol.9, No.8, pp. 1393-1411, 2021, DOI:10.32604/jrm.2021.015772

    Abstract In the present study, the biogenic silver nanoparticles have been synthesized using aqueous leaf extract of Plectranthus amboinicus (PA), which acted as both reducing and stabilizing agents. The PA synthesized silver nanoparticles were blended with carboxymethyl cellulose/polyvinyl alcohol (CMC/PVA) biocomposite. The prepared AgNPs as well as the biogenic AgNPs incorporated CMC/PVA films were investigated using UV-visible spectrophotometry, Fourier-transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS), scanning electron microscope (SEM), and X–ray diffraction (XRD). The DLS results showed that biogenic AgNPs had the average particle size of 65.70 nm with polydispersity index of 0.44. The surface plasmon… More > Graphic Abstract

    Green Synthesis of Silver Nanoparticles Using <i>Plectranthus Amboinicus</i> Leaf Extract for Preparation of CMC/PVA Nanocomposite Film

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