scholarly journals A short review on synthesis and characterisation of nano SiO2/TiO2 composite for insulation application

2021 ◽  
Vol 4 (2) ◽  
pp. 155
Author(s):  
Nurul Farrahani Azlan ◽  
Suffiyana Akhbar ◽  
Suhaiza Hanim Hanipah ◽  
Rahida Wati Sharudin
Keyword(s):  
Dielectric Properties ◽  
Tio2 Nanoparticles ◽  
Polymer Nanocomposites ◽  
Polymer Matrix ◽  
Sol Gel ◽  
Polymer Nanocomposite ◽  
Sio2 Nanoparticles ◽  
Short Review ◽  
Electrical Insulation ◽  
Insulation Material

Silica dioxide (SiO2) and titanium dioxide (TiO2) are nanoparticle fillers that are widely incorporated into polymer matrix for thermal insulation application. Combination of both fillers in producing polymer nanocomposite is interesting to review. This paper reviews on the current and recent research on the method to incorporate the SiO2/TiO2 nanoparticles as the fillers into various polymer matrix such as direct mixing, intercalation, sol-gel and in situ polymerisation as well as the effect of nanofillers on the thermal properties, morphology studies, rheology behaviour, mechanical property, and conductivity (thermal and electrical) of the SiO2/TiO2 polymer nanocomposites. This paper also reviews the effect of SiO2/TiO2 nanoparticles to the polymer nanocomposites in term of dielectric properties as a potential electrical insulation material. SiO2 nanoparticles presented to be the best filler to enhance the dielectric properties compared to the TiO2. When both of nanofillers are incorporated into the polymer matrix, a better result in term of mechanical, thermal, and electrical insulation properties are produced.

Recent Advances in Polymer-Based Nanocomposites: A Brief Review

2021 ◽  
Vol 13 ◽  
Author(s):  
S. K. Parida
Keyword(s):  
Electrical Properties ◽  
Polymer Nanocomposites ◽  
Polymer Matrix ◽  
Polymer Nanocomposite ◽  
Review Article ◽  
Nanosized Particles ◽  
Mechanical And Electrical Properties ◽  
Potential Applications ◽  
Manufacturing Techniques ◽  
Host Polymer

: This presented review article is constructed to be an extensive source for polymer nanocomposite researchers covering the relation of structure with property, manufacturing techniques, and potential applications when a small number of nanosized particles are added to a host polymer matrix. The exceptional structural, mechanical, and electrical properties of polymer nanocomposites after the addition of inorganic solid nanoparticles are elucidated by the large surface area of doped nanoparticles that interact with host polymer matrices. Due to the generation of ideas, the conventional methods of preparation of polymer nanocomposites are made more interesting. Hence, this brief review presents a sketch of different synthesis techniques, characterization, applications, and safety concerns for polymer nanocomposites.

Preparation of TiO2 and SiO2 Nanoparticles and their Effect on Epoxy Resin Nanocomposites

2020 ◽  
Vol 12 (2) ◽  
pp. 135-141
Author(s):  
Gagi Tauhidur Rahman ◽  
Moumita Tasnim Meem ◽  
Md. Abdul Gafur ◽  
Abu Mahmud ◽  
Md. Asadul Hoque
Keyword(s):  
Polymer Matrix ◽  
Epoxy Matrix ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Silica Sand ◽  
Epoxy Nanocomposites ◽  
Nano Sio2 ◽  
Sem Image ◽  
Comparable Performance ◽  
Xrd Patterns

Background: Polymer matrix-based composites are the workhorse of the composite industries. Besides, the idea of modifying the polymer matrix by various inorganic fillers has greatly drawn the attention of materials engineers due to their diversified applications and advanced properties. Objective: The objective of this work was to prepare and characterize Titania (TiO2) and Silica (SiO2) nanoparticles and develop 1wt%, 3wt%, 5wt% and 10wt% TiO2 and SiO2 incorporated epoxy-based nanocomposites. Here, we used TiO2 incorporated epoxy composites as a model to compare the effectiveness and contribution of locally available nano SiO2 in the epoxy matrix. Method: The TiO2 nanoparticles were prepared by most famous and conventional sol-gel method and SiO2 nanoparticles were extracted from Padma river (silica) sand obtained from Rajshahi city, Bangladesh from a very easy and inexpensive route. Both TiO2/epoxy and SiO2/epoxy nanocomposites (approximately 1.3-1.5 mm thick) were prepared via a solution casting method incorporating the TiO2 and SiO2 nanofillers in the epoxy matrix. Results: The XRD patterns and SEM image ensure the formation of TiO2 and SiO2 nanoparticles. A number of tests reveal that mechanical properties especially hardness and young’s modulus of the nanocomposites have increased while decreasing the tensile and flexural strength than neat epoxy due to the incorporation of nanofiller. It is visible that, TiO2/epoxy nanocomposites have shown better performance than the virgin epoxy but surprisingly in most cases, nano SiO2 exhibited comparable and even better contribution than TiO2/epoxy nanocomposites. This indicates that the use of TiO2 in epoxy might be replaced by inexpensive nano SiO2 to be used in various structural sectors. Conclusion: The TiO2 and SiO2 nanoparticles were synthesized successfully. The preliminary experiments predict that the addition of nanoparticles (TiO2, SiO2) converts the composite from being ductile into a brittle material where SiO2/epoxy shows comparable performance with TiO2/epoxy nanocomposites.

scholarly journals Sol-gel Silica Nanoparticles in Medicine: A Natural Choice. Design, Synthesis and Products

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 2021 ◽  
Author(s):  
M. Clara Gonçalves
Keyword(s):  
Silica Nanoparticles ◽  
Human Life ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Short Review ◽  
Biomimetic Synthesis ◽  
Medical Applications ◽  
Gene Target ◽  
Wide Range ◽  
Sol Gel Process

Silica is one of the most abundant minerals in the Earth’s crust, and over time it has been introduced first into human life and later into engineering. Silica is present in the food chain and in the human body. As a biomaterial, silica is widely used in dentistry, orthopedics, and dermatology. Recently amorphous sol-gel SiO2 nanoparticles (NPs) have appeared as nanocarriers in a wide range of medical applications, namely in drug/gene target delivery and imaging diagnosis, where they stand out for their high biocompatibility, hydrophilicity, enormous flexibility for surface modification with a high payload capacity, and prolonged blood circulation time. The sol-gel process is an extremely versatile bottom-up methodology used in the synthesis of silica NPs, offering a great variety of chemical possibilities, such as high homogeneity and purity, along with full scale pH processing. By introducing organic functional groups or surfactants during the sol-gel process, ORMOSIL NPs or mesoporous NPs are produced. Colloidal route, biomimetic synthesis, solution route and template synthesis (the main sol-gel methods to produce monosized silica nanoparticles) are compared and discussed. This short review goes over some of the emerging approaches in the field of non-porous sol-gel silica NPs aiming at medical applications, centered on the syntheses processes used.

A Review on Effect of Nanoreinforcement on Mechanical Properties of Polymer Nanocomposites

2018 ◽  
Vol 280 ◽  
pp. 284-293 ◽  
Author(s):  
M.N. Ervina Efzan ◽  
N. Siti Syazwani
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Polymer Nanocomposites ◽  
Polymer Matrix ◽  
Functional Performance ◽  
Polymer Nanocomposite ◽  
Filled Polymers ◽  
Performance Properties ◽  
New Class ◽  
Potential Use

Polymer nanocomposites represent a new class of materials that offer an alternative to the conventional filled polymers. In this new class of materials, nanosized reinforcement are dispersed in polymer matrix offering tremendous improvement in performance properties of the polymer. The combination of nanoscale reinforcement and polymer matrix possess outstanding properties and functional performance which play an important role in many field of applications. This review addresses the types of nanoscale materials reinforced in polymer matrix such as nanocellulose, carbon nanotubes (CNTs), graphene, nanofibers and nanoclay followed by the discussion on the effect of these nanoscale reinforcement on mechanical properties of polymer nanocomposites. Besides, the potential use of polymer nanocomposite reinforced with those nanoscale reinforcements in various field of applications also discussed.

scholarly journals Influence of the way of synthesis of poly(methyl methacrylate) in the presence of surface modified TiO2 nanoparticles on the properties of obtained nanocomposites

2010 ◽  
Vol 64 (6) ◽  
pp. 473-489 ◽  
Author(s):  
Enis Dzunuzovic ◽  
Milena Marinovic-Cincovic ◽  
Jasna Dzunuzovic ◽  
Katarina Jeremic ◽  
Jovan Nedeljkovic
Keyword(s):  
Ascorbic Acid ◽  
Thermal Properties ◽  
Methyl Methacrylate ◽  
Tio2 Nanoparticles ◽  
Radical Polymerization ◽  
Polymer Nanocomposites ◽  
Polymer Matrix ◽  
Preparation Method ◽  
Pure Pmma ◽  
Surface Modified

Incorporation of inorganic nanoparticles can significantly affect the properties of the polymer matrix. The properties of polymer nanocomposites depend on the type of incorporated nanoparticles, their size and shape, their concentration, and interactions with the polymer matrix. Homogeneity of polymer nanocomposites is influenced very much by the preparation method. In this study, TiO2 nanoparticles surface modified with 6-palmitate ascorbic acid (6-PAA) were incapsulated in poly(methyl methacrylate) (PMMA) by in situ radical polymerization of methyl methacrylate initiated by 2,2'-azobisisobutyronitrile (AIBN). The surface modification of the TiO2 nanoparticles was achieved by the formation of a charge transfer complex between TiO2 nanoparticles and 6-palmitate ascorbic acid. The radical polymerization of MMA in the presence of TiO2-PAA nanoparticles was conducted in solution (PMMA/TiO2-PAA-R), in bulk (PMMA/TiO2-PAA-M) or in suspension (PMMA/TiO2-PAA-S). The main purpose of this study was to investigate the influence of the preparation method on the molar masses and thermal properties of PMMA/TiO2-PAA nanocomposite. It was obtained that molar masses of PMMA extracted from the composites had smaller values compared to molar masses of pure PMMA synthesized in the same manner, which indicated that TiO2-PAA nanoparticles affected the reaction of termination. Thermal properties were investigated by DSC and TGA. The values of glass transition temperature, Tg, were influenced by the way the radical polymerization was conducted, even in the case of the pure PMMA. The Tg of composite samples was always smaller than the value of the corresponding PMMA sample and the smallest value was obtained for PMMA/TiO2-PAA-M since they contained the largest amount of low molar mass residue. The TGA results showed that thermal and thermooxidative stability of polymer composites obtained in solution and in suspension was better than for the pure PMMA obtained in the same way.

scholarly journals Kraft-Pulp Based Material for Electrical Insulation

2017 ◽  
Author(s):  
Rebecca Hollertz ◽  
Lars Wågberg ◽  
Claire Pitois
Keyword(s):  
Dielectric Properties ◽  
Kraft Pulp ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Electrical Equipment ◽  
Electrical Insulation ◽  
Insulation Material ◽  
High Frequency Response ◽  
Static Electrification ◽  
Electrical Breakdown Strength

<p>The dielectric properties of the electrical insulation material have a significant influence on the performance and reliability of components in electrical equipment. The influence of the chemistry and electronic structure of the different constituents of the kraft pulp (used in electrical insulation) on some dielectric properties is discussed in this paper. The studies and mechanisms discussed indicate that the presence of different wood polymers (cellulose, hemicellulose and lignin), have different effects on dielectric properties (static electrification and high frequency response). Our results show that the dielectric response of lignin is different compared with the response of hemicellulose and cellulose and this is also expected from the chemical structure of the different components. The lignin molecule has a higher polarizability at frequencies of significance for streamer inception and propagation. With spectroscopic ellipsometry measurements it has also been shown that the energy for electronic transitions in this spectral region is lower for lignin. The results also clearly indicate that the role of cellulose, lignin and hemicellulose should be further investigated for improving electrical breakdown strength of paper based insulation materials.</p>

Highly Transparent, Tough and Dimensionally Stable Polymer Nanocomposite

2008 ◽  
Vol 1149 ◽  
Author(s):  
Yasuaki Kai ◽  
Katsumi Morohoshi ◽  
Hironobu Muramatsu ◽  
Haruo Unno ◽  
Takashi Oda ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Polymer Matrix ◽  
Dimensional Stability ◽  
Filler Content ◽  
Polymer Nanocomposite ◽  
Polymer Materials ◽  
Hydrolysis Reaction ◽  
High Transparency ◽  
Boehmite Nanoparticles ◽  
Wide Range

ABSTRACTThis report describes a novel polymer nanocomposite that shows high transparency, toughness and dimension stability at the same time. Polymer nanocomposites are attracting industrial interest for a wide range of application. One advantage of polymer nanocomposites is the possibility to obtain visually transparent polymer materials owing to nano-size particles that are smaller than visible wavelengths. Transparent polymer nanocomposites are suitable for light, clear, tough and dimensionally stable applications such as the windows and sunroofs of vehicles or houses and other buildings. However, most of the research on transparent polymer nanocomposites has remained at the stage of showing their potential or future expectations because of the complexity of various nanoparticle-polymer matrix combinations. One of the most difficult challenges for the fabrication of transparent nanocomposites is to keep the dispersion of particles in the polymer uniform at the nano-level until the final composite is obtained. Some successful examples have been reported with polyacrylate-based polymer nanocomposites. For example, silica/PMMA nanocomposites show good transparency even with a high filler content. In fact, most of their transparency depends on refractive index matching. While a nanocomposite may appear transparent to the human eye, TEM observation shows that there are many aggregations inside, preventing the material from ever becoming tough and making it extremely brittle. Some other cases are based on a tough polymer like polycarbonate, but with a very restrained filler content of only several weight percent. Because of such a small amount of filler, dimensional stability cannot be improved. Thus, there have been no reports of highly transparent, tough and dimensionally stable polymer nanocomposites with a filler content of more than 10wt%. We overcame this contradictory challenge and succeeded in dispersing more than 15wt% of filler into polycarbonate. We chose needle-shaped alumina boehmite nanoparticles as the filler, and employed an appropriate amount of organic acid as a surface modifier to aid in uniform particle dispersion in the polymer matrix. Polycarbonate is well-known as a tough polymer, but its main chain easily hydrolyses, either in the presence of an acid or base. The hydrolysis reaction makes the polymer chain shorter, leading rapidly to a brittle composite. We carefully defined the surface modification condition to avoid this hydrolysis reaction. This completely novel composite shows excellent properties without any trade-off, including high transparency (Haze<1%), toughness (Izod>60 J/m) and dimensional stability (CLTE<40 ppm) at the same time.

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