Silane Treatment Research Articles

Mechanical and water absorption properties of nano TiO2 coated flax fibre epoxy composites

The present study aims at evaluating the mechanical properties such as tensile, flexural and interlaminar shear strength of unmodified and nano TiO2 coated flax fibre composites. Nano TiO2 coating on the flax fibres is done by immersing the fibres in a solution containing ethanol and silane coupling agent in volume ratio 10:1 and further adding nano TiO2. Effect of fibre coating on the composites is also evaluated by conducting water absorption tests. The composites are prepared using the compression molding technique. Results indicate an improvement in the tensile, flexural and interlaminar shear strength values by 22%, 24% and 16% respectively. Water diffusion coefficient of fibre modified composites reduced by 42% for 0.6 wt% TiO2 coated samples. Nanoparticle grafting on the fibre surface by silane treatment enhanced the compatibility between the hydrophilic fibre and hydrophobic polymer matrix. Chemical and mechanical bonding is developed between the fibre and matrix on account to the fibre surface grafting with nano TiO2 and silane coupling agent. Mechanical properties and water absorption resistance are thus improved. Nanoparticle coating on the fibre surface is validated from the scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis.

Effect of Silane Coupling Treatment on the Joining and Sealing Performance between Polymer and Anodized Aluminum Alloy

In the fabrication of joined materials between anodized aluminum alloy and polymer, the performance of the metalpolymer joining is greatly influenced by the chemical properties of the oxide film. In a previous study, the dependence of physical joining strength on the thickness, structure, pore formation, and surface roughness of films formed on aluminum alloys is investigated. In this study, we investigated the effect of silane coupling treatment on the joining strength and sealing performance between aluminum alloy and polymer. After a two-step anodization process with additional treatment by silane, the oxide film with chemically modified nanostructure is strongly bonded to the polymer through physical and chemical reactions. More specifically, after the two-step anodization with silane treatment, the oxide film has a three-dimensional (3D) nanostructure and the silane components are present in combination with hydroxyl groups up to a depth of 150 nm. Accordingly, the joining strength between the polymer and aluminum alloy increases from 29 to 35 MPa, and the helium leak performance increases from 10−2-10−4 to 10−8-10−9 Pa m3 s−1.

The Manufacturing Process of Recycled Polymer Composites reinforced with Natural Fibers – A Systematic Literature Review

In the light of growing global awareness in environmental sustainability, it is essential to employ more “environmentally friendly technology” which preserve natural resources. In the past decade, natural fiber composites with thermoplastic and thermoset polymers have been applied by several industrial sectors in various parts of the world. Natural fibers such as kenaf, hemp, sisal, abaca, and sugar palm have been widely used because they provide several advantages such as low cost, environmentally friendly, and reducing dependence on the use of materials that cannot be recycled. The use of recycled material for the development of natural fibre reinforced polymer (NFRP) has seeking current attention. This article reviewed several literatures on the manufacturing process of recycled polymer in NFRP material. The five-step systematic literature review (SLR) was chosen as the approach in reviewing the literature. The analysis of the selected articles revealed that a successful process for making recycled natural fiber reinforced polymers begun by appropriate treatment of natural fibers. Treatment of natural fibers using alkaline treatment (sodium hydroxide (NaOH) and silane treatment is the most influential factor in the success of the process of making recycled polymer composites reinforced with natural fibers. This study implies a new manufacturing trend for natural based fibre composites in recycled polymer matrix.

Manufacturing and Characterization of Hybrid Composites with Basalt and Flax Fabrics and a Partially Bio-based Epoxy Resin

This research is focused on manufacturing and characterization of hybrid composite laminates obtained different stacking sequences of basalt and flax fabrics with silane treatments embedded in a partially bio-sourced epoxy resin as matrix. They were manufactured by the vacuum-assisted resin infusion molding and mechanical properties were tested in tensile, flexural and impact conditions. The effect of the coupling agent on the fiber/matrix interface was studied by FESEM. The effect of temperature on mechanical properties was evaluated by DMTA and TMA. FESEM images revealed improved fiber/matrix interactions with silane treatment, having a more satisfactory effect on basalt fibers than on flax fibers because of its silica-based structure, leading to improved mechanical properties. It is worthy to note that the hybrid stacking sequence has no remarkable influence on the elongation at break. On the contrary, the hybrid stacking sequence offered a great influence on both the elastic modulus and the tensile strength.

A numerical, theoretical and experimental study of the effect of thermocycling on the matrix-filler interface of dental restorative materials

ObjectiveThermocycling is widely used to age dental composites but with very different results from one study to another, even with apparent similar conditions. This study aims at understanding better the relative damaging speed of matrix and fillers, based on theoretical models. MethodsEight formulations of an experimental dental material were produced. The same organic matrix was used and silanated barium glass particles were added as fillers with different filler ratios. Samples were thermocycled up to 10 000 cycles. Three-point bending tests were carried out at different steps. The yield stress was measured among other mechanical properties. ResultsComposite properties were degraded by thermocycling. The decrease was slight during the first 5 000 cycles whereas it decreased significantly after 10 000 cycles. The Turcsányi model asserts that the interface yield stress is slightly affected in the first 5 000 cycles and then falls down, while the decrease of matrix yield stress is linear. SignificanceEach component of a composite does not age at the same rate. First, the matrix acts as a protector until the water finds its way to the interphase. The filler silanization treatment is highly sensitive to hydrolysis and is damaged rapidly from that moment. Numerical simulations and surface observations confirmed that cracks appear to propagate in the neighbourhood of the interface but not directly within it.

Novel Muntingia Calabura bark fiber reinforced green-epoxy composite: A sustainable and green material for cleaner production

This study focuses on the development and property enhancement of novel Muntingia calabura bark micro-fiber reinforced bio-epoxy composite through surface modification techniques using NaOH and silane. The proposed novel plant fiber was extracted from an agro-waste after the tree’s lifespan which was causing landfill. The performance characteristics of the developed composites were evaluated through physico-chemical and thermomechanical analysis. These fibers are subjected to chemical and physical analysis, while the composites are subjected to their mechanical, thermal, thermomechanical, and viscoelastic performance. The results revealed that the silane and NaOH modification of fiber reduced the fiber diameter by 9.17% and 17.43%; improved crystalline index by 41.01% and 14.86%; improved thermal stability by 14.15% and 4.81%; and increased the tensile strength by 37.75% and 28.92%. The complete analysis revealed silane treatment was the best for Muntingia Calabura micro-fiber compared to NaOH treatment and using raw fibers. Finally, based on improved results, this novel plant fiber was identified as a potential resource of environmentally friendly and sustainable raw material for reinforcement in polymer composites, which can be used to develop the green composites for lightweight structural applications.

The importance of particle dispersion in electrical treeing and breakdown in nano-filled epoxy resin

The addition of nano-fillers has been widely proposed as a method to enhance the dielectric properties of high voltage polymeric insulation, though there are mixed reports in the literature. Here the potential of silica nano-particles to extend the time to failure specifically through resistance to electrical tree growth in epoxy resin is determined. The benefit of silane treating the nano-particles before compounding is clearly established with regard to slowing tree growth and subsequent time to failure. The growth of trees in needle-plane samples is measured in the laboratory with loadings of 1, 3 and 5 wt% nano-filler. In all cases the average times to failure are extended, but silane treatment of the nano-particles prior to compounding yields much superior results. The emergence of a pronounced inception time before tree growth is also noted for the higher-filled, silane-treated cases. The average time to failure of silane-treated 5 wt% filled material was 28 times that of the unfilled resin. The improvement in performance between the nanocomposites with untreated and treated fillers is attributed to fewer agglomerations and improved dispersion of the filler in the treated cases. Measurements of Partial Discharge (PD) indicated significant differences in PD patterns during the growth of trees in the treated and untreated cases. This distinction may provide a quality control method for monitoring materials. In particular, long periods in which PDs were not measured were observed in the silane-treated cases. Visual imaging of tree growth in the unfilled material allowed the changing nature of the tree from fine to tree to dark tree to be observed as it grew. Corresponding PD measurements suggest the dark tree is gradually becoming conductive, and that growth of maximum PD measured is dependent on the relative rates of the growth of the tree and its carbonization. X-ray computer tomography identified significant differences in average tree channel diameters (a reduction from 2.8 µm to 2.0 µm for 1 wt% and 3 wt% cases). This implies that in addition to tree length changes, evaporated tree volumes also change and may explain the change in partial discharge characteristics observed.

Suitability evaluation of untreated and surface-modified Eichhornia crassipes fibers for brake pad applications

ABSTRACT The current study investigated the suitability of untreated, alkali-treated, and silane-treated Eichhornia crassipes fibers as reinforcement in brake pads. The physio-chemical, thermal, crystalline properties of the untreated, alkali-treated, and silane-treated fibers were evaluated. Chemically modified fibers were utilized to develop brake pads and their properties were evaluated as per the industrial standards. The outcomes elucidated that silane treatment removed the extra lignin, hemicellulose, wax substances from the constituents of the Eichhornia crassipes fibers which increased the fiber bonding with the phenolic resin in brake pads. The silane-treated Eichhornia crassipes fibers had the higher thermal stability, maximum degradation temperature (338.2ºC), and crystallinity index (33.17%) than untreated and alkali-treated fiber. The brake pads with silane-treated Eichhornia crassipes fibers showed less acetone extraction value of 1.1%, proving its better curing and fade-recovery characteristics with the standard range as prescribed by industrial standards. Chase tested brake pads with silane-treated Eichhornia crassipes fibers had good fiber bonding and plateau formations as inferred from Scanning Electron Microscope.

Improvement in mechanical, electrical, and shape memory properties of the polystyrene‐based carbon fiber‐reinforced polymer composites containing carbon nanotubes

AbstractCarbon fiber‐reinforced polymers based on polystyrene matrix containing elastomer and carbon nanotubes (CNTs) were produced by compression molding. The effects of carbon fabric (CF) concentration and silane treatment on the morphology, mechanical, electrical, and shape memory properties of the multilayer composites were investigated. The SEM analyses showed that fibers of the silane‐treated CFs were more homogeneously covered with the polymer layers than the untreated CFs. The tensile strength and modulus of the composites increased by 521% and 125%, respectively, with an increasing number of CF plies from one to five. Upon silane treatment, the tensile strength of the multilayer composite improved by 26%, and the tensile modulus decreased by 18.4%. Electrical conductivities of the composites were in the semiconductor region due to the presence of both CNTs and CFs. 100% shape recovery less than a minute recovery time was obtained for all the composites with electrically triggered bending test.

Curing behavior and flexural properties of cyanate composites reinforced with rare earth- and silane-modified basalt fibers

Herein, basalt fibers (BFs) modified by treatment with (3-aminopropyl) triethoxysilane and lanthanum ethylenediaminetetraacetic acid were used to fabricate BF-reinforced bisphenol A dicyanate ester composites via cast molding, and the effects of the modification method on the surface chemical groups and structures of BFs were determined using a range of instrumental techniques. Both modifications increased the number of functional groups on the BF surface. Silane treatment was shown to increase the BF surface roughness to a greater extent than rare earth treatment. Subsequently, we investigated the curing behavior and mechanical properties of BF-reinforced composites, demonstrating that the curing temperature of bisphenol A dicyanate ester was more effectively lowered by the incorporation of lanthanum-modified BFs than by that of silane-modified BFs. Additionally, the composite containing 12 wt% La-modified BFs exhibited flexural strength and modulus that exceeded those of the composite containing 12 wt% silane-modified BFs (by 15 MPa and 0.6 GPa, respectively), which was ascribed to the higher strength of La-modified fibers and the higher extent of curing and moderate interfacial adhesion of the former composites. In summary, lanthanum ethylenediaminetetraacetic acid was proven to be a more effective modifier than (3-aminopropyltriethoxy) silane for improving the curing behavior and flexural properties of the composites.

Effect of surface treatment on mechanical, physical and morphological properties of oil palm/bagasse fiber reinforced phenolic hybrid composites for wall thermal insulation application

The effect of 2%v/v silane and 4%v/v hydrogen peroxide treatment on mechanical, physical and morphological characterization of oil palm empty fruit bunch (OPEFB) and sugarcane bagasse (SCB) fiber reinforced bio-phenolic hybrid composites has been evaluated in this work. The treated OPEFB and SCB fibers has been prepared with different ratio while maintaining 50%wt fiber loading, and then incorporated with the bio-phenolic resin by hand layup technique to produce pure and hybrid composites. Universal testing machine INSTRON has been used for tensile, flexural, and compressive strength analysis. Water absorption and thickness swelling are determined after 24 h. Fracture behaviour, void and fiber pull out of the specimen was observed by using scanning electron microscope in morphological analysis. The hybridization of silane treated 7OPEFB:3SCB fiber indicates better highest performance on tensile strength and modulus with 11.67 MPa and 1348.43 MPa. The silane treated 5OPEFB:5SCB hybrid composites show highest flexural and compressive strength, 16.82 MPa and 6.53 MPa, respectively. Obtained result showed silane treated 3OPEFB:7SCB hybrid composites displays lowest water absorption and thickness swelling after 24 h analysis and show less void content. This study indicated that 2%v/v silane coupling agent gives better enhancement of mechanical properties compared to 4%v/v hydrogen peroxide treatment. Silane treated 5OPEFB:5SCB fiber reinforced bio-phenolic hybrid composites fulfil requirement of the mechanical and physical properties needed for insulation board as per standard. It can be concluded from this study that silane treatment improve the performance of agriculture residue and the hybridization of bio-composites have potential to develop new class of eco-friendly thermal insulation and sustainable wall building materials.

Effects of surface modification of Nano-SiO2 imbedded in organic matrix on interfacial accumulation of water molecules: an atomistic simulation study

Silica nanoparticles are used as additives to organic coatings to modify their properties. The interface of inorganic nanoparticles with an organic matrix can be a preferred location for accumulation of water. Surface treatment of nanoparticles with 3-glycidoxypropyltrimethylsilane (silane) is one way to reduce the water accumulation. In this work, using atomistic simulations (MD), we studied the effects of silane treatment on accumulation of water at the interface of nanoparticles. Three different epoxy phases and two methods of deposition of water were simulated. Water molecules were studied at two locations: (i) the interface of nanoparticles, and (ii) in the matrix of coatings. Additionally, the changes in the organic matrix due to surface treatment of nanoparticles were studied. The simulations show how silane treatment affects the interactions of water with nanoparticles in different epoxies, and also how silane treatment reduces the water accumulation in an organic matrix with nanoparticles.

Potential of Pineapple Leaf Fibers and Their Modifications for Development of Tile Composites

ABSTRACT The research article focuses on succinct characterization of pineapple leaf fibers before and after different chemical modification techniques so as to ease its usage in developing light weight composite tiles for bathroom floor or wall tiles in building and construction industry. After the surface treatment namely, 7% alkali, 3% acrylic acid, and 1% silane treatment, fibers were analyzed through physical, chemical, morphological, mechanical, and thermal properties using various sophisticated instruments and concluded with the fact that in general, surface treatment helps in strengthen the fiber properties. Fibers with 7% alkali treatment exhibit maximum improvements, 55% increase in tensile strength, 40% increase in crystallinity index, 13% increase in density and 12.6% decrement in diameter. Similar enhancements in fiber quality were witnessed in physical, chemical, and thermogravimetric analysis. After 60% mass degradation of the fiber, fibers with 7% alkali treatment show better thermal stability till around 700°C.

Silane compatibilzation to improve the dispersion, thermal and mechancial properties of cellulose nanocrystals in poly (ethylene oxide)

Cellulose nanocrystal (CNC) has potential to be used as a reinforcement in polymeric nanocomposites because of their inherent biodegradability, universal accessibility, and superior mechanical properties. The most crucial challenge faced in the nanocomposite production is dispersing the nanoparticles effectively in the polymer matrix, so that the exceptional mechanical properties of the nanoparticles can be transferred to the macroscale properties to the bulk nanocomposites. In this research, a safe, effective and ecofriendly modification was used to functionalize the surface hydroxyl groups of CNC via silane treatment. These modified CNCs were used as reinforcements to prepare poly (ethylene oxide) (PEO)/CNC nanocomposites. The composites were prepared using solvent casting method. The composite properties were evaluated using Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), Thermo-Gravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), and Dynamic Mechanical Analysis (DMA). The SEM micrographs demonstrated that the composites incorporated with silane treated CNCs showed improvement in the dispersion behavior of the nanoparticles in the matrix. Oxidative combustion of the composites containing silane treated CNCs promoted char formation and enhanced thermal stability. The composites containing (1:1) silane treated CNCs exhibited the better crystallization ability, highest storage modulus, and lowest tan δ value compared to the other silane treated systems indicating improved dispersion of CNC. The polysiloxane network provided an efficient surface covering of the CNC molecules, imparting reduced polar surface characteristics and enhancing the overall mechanical properties of the composites.

Flexural strength of hybrid composite resin epoxy reinforced stinging nettle fiber with silane chemical treatment

<abstract> The advantage properties of stinging nettle (<italic>Urtica dioica</italic> L.) fiber compared to other natural fibers are its strength and lightweight. These fibers can be used as a substitute for synthetic fibers for reinforcing epoxy resin composite hybrid materials. This study aimed to determine the flexural properties of epoxy resin composite hybrids reinforced with stinging nettle fiber with weight ratios: 10%, 15%, and 20%, and chemical treatment of silane on the fibers: 3%, 6%, and 9%. The method of making composites was by hand lay-up, at room temperature, holding time 12 h, and using a load of 10 psi. Flexural testing used the RTG 1250 type test tool concerning the ASTM D790-3 standard. The results showed that the ratio of stinging nettle fiber composition to the epoxy resin matrix and silane treatment had a significant effect on flexural strength. Hybrid composite with 10% fiber and 3% silane treatment mode had the lowest flexural strength at 32.065 MPa and the highest flexural strength at 20% fiber and 9% silane treatment at 49.325 MPa. The highest strain was 0.0284 mm/mm in the 20% fiber and 9% treatment and the lowest was 0.0141 mm/mm in the 10% fiber and 3% silane treatment. Therefore, stinging nettle fiber-reinforced epoxy resin hybrid composites are able to withstand bending loads due to their high flexural properties. With the increase in fiber composition, the increase in silane concentration provides increased strain so that the flexural ability will be better. </abstract>

Effect of Hemp Fibre Surface Treatment on the Fibre‐Matrix Interface and the Influence of Cellulose, Hemicellulose, and Lignin Contents on Composite Strength Properties

Natural fibres have recently become an attractive alternative to synthetic fibres in the implementation of polymer composite structures. Inherent flaws within natural fibres in terms of their constituent contents (hemicellulose, cellulose, and lignin) reduce the compatibility of these fibres with polymer matrices. In this study, the effects of chemical treatments on hemp fibres and the resulted polyester matrix composite are investigated. The fibres were treated with alkali (0–10% NaOH), acetyl, and silane chemicals. Long unidirectional fibre composites were prepared by vacuum‐assisted resin transfer moulding (VARTM) process. Thermal properties of the fibres were tested using differential scanning calorimetry (DSC) analyses. The mechanical properties of the composite samples were tested using compression and bending tests. Failure analysis of tested composites was undertaken through Optical Microscope (OM) and Scanning Electron Microscope (SEM). The results showed that the treatments of the 4% NaOH reduced interfacial bonding strength and decreased composite properties compared to untreated samples. At higher concentrations (6–10% NaOH), the mechanical properties of the composites increased as a result of greater interfacial bonding. Different trends were observed in the case of alkalised fibres that were further treated with acetyl and silane treatments. It was observed that the treated fibres effectively improved the bonding properties of composites and was in agreement with the micrographs.

EFFECTS OF WETTABILITY ON DISPLACEMENT EFFICIENCY OF TWO-PHASE FLOW IN POROUS MEDIA

Displacement efficiency and displacement pattern of multiphase flow in porous media have a profound influence on many geo-energy applications such as geologic CO$_{2}$ sequestration and enhanced oil recovery. Wettability is one of the most important factors affecting the displacement pattern and displacement efficiency of multiphase flow in porous media. Here, we combined the glass microfluidics, inverted microscope and high speed CMOS camera to set up a visualization experimental system and modified the surface wettability of the glass microfluidics using the silanization treatment and piranha solution. Pore-scale visualization displacement experiments were conducted on five flow rates and two wetting conditions (hydrophilic and hydrophobic conditions) in glass microfluidics which are fabricated from the pore structure of natural sandstone. Experimental results show that the displacement pattern shifts from capillary fingering to compact displacement pattern both in the hydrophilic and hydrophobic media as the flow rate increases. Under lower flow rates, the capillary force plays the dominant role in the fluid invasion processes. The invasion finger width and the number of air clusters in hydrophilic media are both smaller than those in the hydrophobic media, but the maximum air cluster radius, the average cluster radius and the standard deviation of cluster radius are all greater under hydrophilic conditions. The results also demonstrate that the displacement efficiency under hydrophilic condition is significantly lower than that of hydrophobic conditions due to single-channel flow and by pass flow phenomena which both only occur in hydrophilic media. Finally, a modified capillary number was introduced in order to consider the role of wettability (contact angle) under favourable displacement. Then, a relationship between the displacement efficiency and the modified capillary number was proposed, which provides a potential and useful method for the prediction of displacement efficiency under different wetting conditions during favourable displacement.

Study on preparation of amphiphilic silane and its modification on copper surface

The amphiphilic polymers monosilane and disilane were synthesized in this sdudy. The pretreated copper plates were modified by the synthesized silane. The copper plates after silane treatment were characterized by measuring total reflection fourier infrared spectroscopy (ATR-FTIR), electrochemical impedance, X-ray photoelectron spectroscopy, and contact angle. ATR-FTIR and XPS confirmed that the amphiphilic polymer silane was successfully grafted onto copper surfaces; the contact angle measurement results showed that the contact angle of the surface of the copper plate after grafting the silane was reduced from 83°to 50°; the electrochemical impedance results showed that the electrochemical transfer resistance on the surface of the copper plates after grafting the silane was increased from 702.8 to 6452.. This study has important reference significance for inhibiting the corrosion of copper plates.

Chemical Modification on Woven Jute and Nonwoven Wet-Laid Glass Fiber Sheet Reinforced Poly-(&amp;lt;i&amp;gt;ε&amp;lt;/i&amp;gt;-Caprolactone) Composites

High-moisture regains nature of cellulosic fibers considered one of the critical drawbacks for jute-based applications. To minimize this by developing better interfacial adhesion, a hydrophobic nonwoven wet-laid glass fiber sheet used the woven jute fabric in this experiment. For this purpose, woven jute fabric was categorized into untreated, silane, alkali, and alkali-silane combined treatment then compounded with the solution of polycaprolactone (PCL). Fabrication of composites performed the following sandwich method based on different hot-pressing time with temperature for detecting a prominent fabrication parameter. Surface treated jute fibers characterized using FTIR spectroscopy. Hence, the mechanical and thermal properties of composites were investigated to find the consequence of chemical treatments into woven jute fabric. Alkali-silane combined chemical treatments resulting in improved 48.38% of tensile strength over untreated optimized composites. Scanning electron microscope (SEM) used for displaying interfacial adhesion between fiber and polymer matrix. Besides, further investigation demonstrated due to the combined chemical treatment of alkali-silane optimized composites significantly enhanced the thermogravimetric (TGA) stability in contrast to other composites.

From the Editor

Layered silicates present interaction sites at both faces and edges of the nanolayers and silane coupling agents that locate at both sites lead to polymer nanocomposites with superior melt strength and properties. This work’s objective was (a) to investigate the effectiveness of solvent-free, vapor phase, silane treatment of the nanolayers for formulating masterbatches and (b) to compare the mechanical properties of 1mil thick blown films from polypropylene copolymer nanocomposites with such coupling, to films from the neat polypropylene. The nanocomposite blown film tensile modulus and tensile strength improved along both the draw direction and the transverse direction. In addition, their elongation to failure was close to 500% along both directions, in contrast to values of 500% along MD and 170% along TD for the neat PP copolymer. These trends may be understood in terms of the crystalline lamellar orientation distribution in the films. FESEM images revealed that cross-hatched lamellae were absent from the unfilled PP blown film and were pervasive in the nanocomposite blown film. The nanolayers were oriented in the film plane with the longer dimension largely along the MD. The lower extent of lamellar orientation around nanolayers may be attributed to the strong reduction in the polymer chain mobility attached to the nanolayers. Polyaniline and quantum dot-based nanostructures: Developments and perspectives” also by Ayesha Kausar reviews Quantum dots which are 2–5 nm nanoparticles with exceptional optical, electronic, luminescence, and semiconducting properties. Polyaniline is an exclusive conjugated polymer. This article reviews recent efforts, scientific trials, and technological solicitations for polyaniline/quantum dot-based nanocomposites. Polyaniline/quantum dot mixtures form a unique composition for advance materials and applications. Carbon dots, graphene quantum dots, and several inorganic quantum dots have been added to a conducting polymer. A functional quantum dot may develop electrostatic, van der Waal, and p–p stacking interactions with the conjugated polymer backbone. Uniform quantum dot dispersion in polyaniline may result in inimitable morphology, electrical conductivity, electrochemical properties, capacitance, and sensing features. Finally, this review expounds on the many applications for polyaniline/quantum dot nanocomposites including dye-sensitized solar cell, supercapacitor, electronics, gas sensor, biosensor, and bioimaging. And a final thought. “The power of population is so superior to the power of the Earth to produce subsistence for man, that premature death must in some shape or other visit the human race” Thomas Malthus 1798