Carbon Black Content Research Articles

Quantitative analysis of the concentration of nano‑carbon black originating from tire-wear particles in the road dust

Exhaust and non-exhaust particulate matter (PM) is regarded as the most significant airborne during driving. Among the source of non-exhaust PM, the tire-wear particles (TWP) can be quantified using pyrolysis-gas chromatography/mass spectrometry (Py-GC–MS). TWPs are fragmented by continuous weathering once exposed to the road. Approximately 5 wt% of carbon black (CB) bound in the rubber matrix of TWPs tends to detach from it, and thus some portion of free-bound CB could be co-existed in the road dust. Although there are existing methods for analyzing pure CB and TWPs, only few analysis techniques on the amount of free-bound CB in contaminant samples have been discovered. Herein, we propose a method for quantifying the total and free-bound CB in road dust using a combination of four analytical tools: a semi-continuous carbon analyzer, element analyzer, thermogravimetric analyzer, and Py-GC–MS. This study is the first attempt in quantifying the concentration of nano-CB derived from TWPs in road dust. The proposed methodology was applied to the samples collected from five open sites, three closed sites, and four types of air conditioner (AC) filters in passenger vehicles. Compared to the samples obtained in open sites, the road dust in the closed sites exhibited 21.5 times higher TWP content (59,747 mg/kg) and 5.1 times higher free-bound CB content (14,632 mg/kg). In addition, unintentional driver respiratory exposure to PM fixed in the vehicle filters was discovered owing to the increase in CB and TWP contents in aged AC filters.

Electrical and Mechanical Properties of Silicone Electrical Conductive Adhesives (ECAs) Filled Carbon Black Treated with 3-Aminotriethoxysilane at Elevated Temperature

In this study, different formulation of silicone filled carbon black electric conducting adhesive (ECAs) were successfully fabricated. Carbon black (CB) was treated with 3-aminotriethoxysilane to improve the surface adhesion by grafting of amide functional groups on the surface of the CB. Various loading of untreated and treated CB (0%,5%,10% and 15%) on silicone ECAs using film casting method were prepared and characterized. The characterization was performed on the conductive adhesive film by using Fourier Transform Infrared Spectroscopy (FTIR), hardness and tensile testing. While for the electrical property, electrochemical impedance spectroscopy (EIS) was investigated. The FTIR spectrums confirmed the surface modification of CB with 3-aminotriethoxysilane and amide functional groups was presence at 1549 cm-1, 1250.7 cm-1, 1126.6 cm-1,976.16 cm-1and 860.02 cm-1corresponding to the N-H, SiO-H, Si-O-Si, C-N and C=C stretching vibrations of the amino groups (-R-NH3+) respectively. The conductivity of the ECAs was dependent on the CB loadings. As the CB loading increased, the conductivity of adhesive conductive film was increased up to 10% of CB loading and decreased when at 15% of CB loading. This is due to the gap distance of interparticle of silicone and CB is high. Whilst the tensile strength of the silicone filled CB increased with increasing of CB content both untreated and treated CB at 0.05954 MPa and 3.3027 MPa respectively. This is supported by hardness testing also showed the same trend with increment of CB loading, the hardness value also increased. The optimum value was found at 42 and 54 for untreated and treated CB respectively. The optimum formulation of electric conductivity was found at 10% loading of CB at 1.75E-08 /cm. The conductivity of ECAs filled CB at elevated temperature exhibits increment trend of untreated/treated CB at temperature of 100 °C to 160 °C however decreased at 180 °C. It is believed that with increasing the temperature, the interparticle average distance increase due to the difference in the thermal expansion of silicone and carbon black. The utilization of treated CB in silicone ECAs improved the conductivity and mechanical properties giving way to a full potential of using CB as filler.

Modeling and experiments of the thermal degradation behavior of PMMA during laser transmission welding process

Reducing thermal degradation of plastics during laser transmission welding (LTW) process is the key to obtain high-quality weld seam. In this study, a thermal degradation prediction model is proposed. First, using polymethyl methacrylate (PMMA) as an exemplary material, the weld seams are prepared at different process parameters, including the laser power, welding velocity and carbon black (CB) content. Full characterization of the prepared weld seams was performed through shear tests, scanning electronic images, and ultra-depth-of-field microscope. The results reveal that thermal degradation occurs with bubbles at the interface and decreases the shear strength of the weld seam. Second, the thermal history model during LTW is simulated through a 3-D transient heat transfer finite element method (FEM), where the highest temperature is extracted to aid in comprehension of thermal degradation mechanism. Third, a thermal degradation prediction model is proposed based on the thermal history model and thermal degradation kinetic model which is solved by the thermogravimetric analysis (TGA). The results from the proposed prediction model is consistent with the occurrence of the initial thermal degradation and the trend of shear strength of the weld seam. Therefore, this study might present a potential way to optimize the processing window by effectively suppressing the appearance of thermal degradation.

Experimental investigation on the application of FDM 3D printed conductive ABS-CB composite in EMI shielding

Acrylonitrile butadiene styrene (ABS) is a petroleum-based thermoplastic primarily used in fused deposition modeling (FDM) based 3D printing and injection molding applications because of its low cost and recyclability. The addition of carbon black (CB) makes ABS conductive and can be used in electronic applications. In this experimental work, the electromagnetic interference (EMI) shielding performance of 3D printed ABS-CB composite with varying thickness (0.2–2 mm) is investigated in the frequency range of 1 GHz–12 GHz and maximum shielding effectiveness (SE) is obtained for 2 mm absorber thickness at 2.4 GHz (S-band). Also, the composite has been characterized for its electrical and mechanical properties. The electrical conductivity increases with the inclusion of CB. But, the mechanical properties such as tensile and impact strength reduced with a rise in the CB content.

In-situ positron annihilation lifetime measurements of strained isoprene rubber filled with carbon black

The free volume in carbon-black filled isoprene rubber is determined by in-situ positron annihilation lifetime measurements on the rubber subject to tensile strain using ortho-positronium as a probe. The dependence of free volume on the elongation and carbon black loading in the strained state is investigated to clarify the reinforcement mechanism of carbon black in synthetic rubber. Although no change in the ortho-positronium lifetime is detected, the ortho-positronium formation probability sharply decreases with increasing elongation and carbon black concentration in the strained state. The percent reduction is enhanced at high elongations and carbon black loadings. This result indicates the formation of both a bound rubber layer around the CB fillers and regions in the strained rubber phase with oriented molecular chains characterized by lower mobility, where ortho-positronium formation is suppressed.

Flexible electrospun fluorescent anisotropic conductive Janus-typed nanoribbon membrane

Flexible multiple-functional conductive anisotropic membrane made of one-dimensional directional nanomaterial has the potential applicative prospects in advanced electronic skin and strain sensor. Nevertheless, it is hard to prepare aligned polymeric composites with poly-functional high conductive anisotropy and excellent interface properties, so it has been a vital topic to fabricate and investigate such kind of composites. In this work, the fluorescent anisotropic-conduction Janus-typed nanoribbon array membrane (named as FAJNAM for short) with [Eu(TTA)3bipy/polymethylmethacrylate (PMMA)]//[carbon black (CB)/PMMA] Janus-typed nanoribbon as construction unit is prepared by di-axial parallel electrospinning with a di-axial parallel spinneret. Since CB will seriously affect the fluorescence intensity of the Eu(TTA)3bipy complex, through using Janus-typed nanoribbon as construction unit, Eu complex and CB can be confined in their own regions, realizing efficacious separation of fluorescent and electrical substances to significantly reduce the adverse effects between the two functions so as to obtain excellent red fluorescence and electrical conduction. The percolation zone of CB in Janus-typed nanoribbons membrane is determined. By adjusting the content of CB, the transition from insulation to conductivity of the FAJNAM can be realized. The highest anisotropic conduction ratio reaches ca. 108 when the CB content is 10 %. For the first time, the crucial of critical diffusion concentration of two-phase spinning solutions in the parallel electrospinning process is advanced and studied in depth. Furthermore, the relationship between the critical diffusion concentration and the conductive aeolotropism degree has been explored. The concept of critical diffusion concentration is also applicable to other di-axial parallel electrospinning to prepare multi-functional materials, which will be of great significance to optimize electrospinning conditions. This research provides new technical support for the preparation of highly flexible, conductive anisotropy composite materials.

Influence of carbon black and carbon nanotube on mechanical and piezoelectric properties of γ–C2S–PZT composite

This paper investigated the influence of carbon black (CB) and carbon nanotube (CNT), used at 0–1%, by volume, on mechanical performance and piezoelectricity of 0–3 γ–C2S–based piezoelectric composite. The γ–C2S–based piezoelectric composite was prepared through carbonation of the proportioned mixture. Parameters d33, g33, and εr were characterized with the CB and CNT additions. The influence of PZT size and volume on these parameters were also studied. Tested results showed that a greater PZT average size and volume significantly improved the d33, g33, and εr values of γ–C2S–based piezoelectric composite given the increased contact among PZT particles. The use of 1.0% CB can lead to 50% and 265% enhancements in d33 and εr, respectively. Such improvements in d33 and εr values were 50% and 190%, respectively, with the addition of 0.3% CNT. This is attributed to the enhanced conductivity of γ–C2S–based piezoelectric composite, which can promote the poling of PZT particles. Moreover, the compressive strength of γ–C2S–based piezoelectric composite were improved by 12 and 3 MPa with the use of CB and CNT, respectively. In addition, the γ–C2S–based piezoelectric composite had 2–6 folds greater d33 and εr values given the similar CB and CNT contents relative to those of cementitious piezoelectric composite. Therefore, the use of CB and CNT can advance the development of γ–C2S–based piezoelectric composite with enhanced mechanical performance and piezoelectricity.

Study on Mechanical Performance of ECC Reinforced by Polypropylene Fiber Mixed with Manufactured Sand and Carbon Black (CBMSPP-ECC) Based on Response Surface Method

In order to study the mechanical performance of Engineered Cementitious Composites (ECCs) mixed with carbon black (CB), manufactured sand (MS), and polypropylene fiber (PPF), response surface methodology (RSM) was used to design the experiment, and three process variables including PPF content, fly ash content (FA), and CB content were selected as factors. The flexural strength, compressive strength, flexural-compressive ratio, and splitting tensile strength were used as four responses to study the mechanical performance. The prediction model indicates that there is a good correlation between the factors and the responses. Multiobjective optimization results show that the optimal content of the three factors is 2.4%, 58.48%, and 1.09%, respectively, for the carbon black, and manufactured sand of polypropylene fiber reinforced ECC development laid a foundation.

Self-sensing performance of engineered cementitious composites reinforced by polypropylene fiber mixed with manufactured sand and carbon black (CBMSPP-ECC) based on response surface Method(RSM)

In order to facilitate the real-time health monitoring of structures, a low cost and self-sensing concrete material was developed. Using carbon black (CB) as a conductive material, studied the self-sensing performance of Engineered Cementitious Composites (ECC) mix with domestic polypropylene fiber(PPF), used the response surface method (RSM) design test, three process variables, the content of PPF, fly ash (FA), CB, were considered as factors. The fractional change in electrical resistivity (R1) and sensitivity coefficient (R2) were evaluated, and the corresponding relationship equations of factors and responses were obtained. It is helpful to choose the content of each factor according to the actual engineering needs. The results of multi-objective optimization showed that the optimal PPF content (A), FA content (B) and CB content (C) were 2.5%, 72.8% and 1.1%, respectively. This lays a theoretical foundation for the development of ECC enhanced by polypropylene fiber mixed with carbon black and manufactured sand (MS).

Probing intraparticle heterogeneity in Ni-rich layered cathodes with different carbon black contents using scanning probe microscopy

Much effort has been made to improve the electrochemical performance of Ni-rich layered cathodes toward high-energy density of Li-ion batteries. Nonetheless, capacity fading and chemo-mechanical behaviors during charge/discharge processes have not been fully understood yet. Herein, we report microstructural changes and capacity degradation of a polycrystalline LiNi0.88Co0.09Al0.03O2 (NCA) cathode during repeated cycles using electron microscopy and scanning probe microscopy. By varying the content of carbon black (CB; 1–4 wt%) in the NCA cathode, we evaluated cycle performance, capacity-fading, and structural degradation by scanning electron microscopy, scanning spreading resistance microscopy, and Kelvin probe force microscopy based on atomic force microscopy. CB content at 1 wt% in the NCA cathode resulted in a significant increase of electrode resistance and hence a severe capacity decay of full cells. Microscopic analyses for cycled cathode particles surrounded by different CB contents confirmed that the lack of CB around particles developed secondary particle microcracking, local heterogeneity of capacity fading, and formation of NiO-like phase, which could be responsible for degradation of the cathode during repeated cycles. Our results offer a new way to diagnose chemo-mechanical changes of Ni-rich cathodes with different electrochemical properties and highlight the significance of electrode engineering for ensuring effective charge-transport pathways.

Self-adaptive anode design with graphene-coated SiOx/graphite for high-energy Li-ion batteries

Si-based materials are promising high-capacity anodes, which can improve the energy density of Li-ion batteries (LIBs) that are required for the advancement of electric vehicles. Nevertheless, the severe volume change of Si-based materials during repeated cycles limits their widespread applications in LIBs. Here, we report a durable and high-energy blended anode composed of artificial graphite (AG) and graphene (Gr)-coated SiOx (SiOx@Gr) particles. The Gr coating reduces the electrode swelling during repeated cycles and increases the initial Coulombic efficiency of SiOx. This further increases the areal capacity owing to the reduction of carbon black (CB) content to 3 wt%. The SiOx@Gr/AG blended anode exhibits excellent properties compared to the bare SiOx/AG anode. These results can be attributed to the self-adaptive behavior by Gr sheets coated on SiOx particles, which mitigates the mechanical damage on the AG particles and maintains the electron conduction pathways. Hence, the reversibility of the charge–discharge reactions improves, as revealed by Raman spectral mapping and powder flowability measurements. Furthermore, the full-cell with the SiOx@Gr/AG anode exhibits good cycling stability and high volumetric capacities over 300 cycles compared to the full-cell with the bare SiOx/AG anode and AG-only anode, demonstrating the applicability of the high-capacity Si-based anodes for LIBs.

Heavy metals, PAHs and POPs in recycled polyethylene samples of agricultural, post-commercial, post-industrial and post-consumer origin

In the present work, recycled polyethylene (LDPE) samples of agricultural, post-commercial, post-industrial and post-consumer origin were selected and analysed. The analysis comprised the determination of different contaminants such as metals, polycyclic aromatic hydrocarbons (PAHs), dioxin-like biphenyl polychlorides (PCBs), and polychlorinated-dibenzo-p-dioxins and furans (PCDD/Fs). A comparison with one sample of virgin plastic (unrecycled) was performed. The study aimed at stressing the importance of this type of analysis in recycled plastics. Indeed, such an examination will determine the material’s final destination, and the possible origin of the pollutants analysed is investigated. Black post-industrial and post-consumer samples presented the highest concentration of PCBs and PCDD/Fs, attaining a maximum value of 2.40 pg WHO-TEQ/g, while the least toxic sample (post-commercial) presented a toxicity of 0.38 pg WHO-TEQ/g. PAHs content was also much higher in black samples, reaching 514.41 ng/g, while the lowest concentrations were obtained for the post-commercial plastic sample, which did not exceed 38.98 ng/g. The higher PAHs concentrations in the black samples were related to the carbon black content of the black samples, which was 2.00% for black post-industrial sample and 1.51% for post-consumer sample. The PCDD/Fs congener profile observed in almost all samples was very similar to the profile found in the literature on urban air samples, indicating that the plastic is mainly influenced by the environment. The presence of some metals (mainly copper) showed a slight correlation with PCDD/Fs content. The pollutants analysed were found to be significantly reduced during the cleaning processes that are generally carried out in recycling companies.

CB/PDMS electrodes for dielectric elastomer generator with low energy loss, high energy density and long life

Dielectric elastomer generator (DEG), consisting of highly deformable dielectric elastomer (DE) film sandwiched between compliant electrodes, can convert mechanical energy into electrical energy. The widely used carbon grease (CG) electrode has short service life. The conductive rubber electrode is the most promising electrode, but its properties still need to be improved to obtain DEG with high energy density and long life. In this study, thin electrode film of superconducting carbon black (CB)/Polydimethylsiloxane (PDMS) composite with smooth surface, uniform thickness and good dispersion of CB in PDMS matrix was prepared by using solution blending combined with ultrasonication followed by freeze drying and mask scraping technique. The strong interfacial bonding between the electrode and DE substrate was obtained by optimizing CB content and mask scraping technique and by using PDMS in both electrode and DE substrate. High elongation at break, good compliance, high electrical conductivity (EC) and high stability of EC were successfully obtained. Compared with DEG using CG electrode, the energy loss at the same conditions of DEG using the electrodes with 6 wt% CB is reduced by 40.3%, and the harvested energy density (up to 20.5 mJ/cm3) increases by 32%. More importantly, CB/PDMS electrode can withstand 60,000 cycles of stretching under 200% strain, much higher than that reported in previous studies.

Visual, Non-Destructive, and Destructive Investigations of Polyethylene Pipes with Inhomogeneous Carbon Black Distribution for Assessing Degradation of Structural Integrity.

Carbon black (CB) is used in polyethylene (PE) pipes to protect against thermal and photooxidation. However, when CB is not properly dispersed in the PE matrix during processing, white regions having little or no CB concentration, known as “windows,” appear within the CB/PE mixed black compound. In some cases, windows can drastically affect the structural integrity of both the pipe and butt fusion joint. In this work, PE pipes with varying amounts of windows were investigated for their characteristic window patterns, as well as quantifying the area fraction of windows (% windows). Tensile test on specimens with known % windows determined a critical limit above which the fracture strain rapidly degrades. Micro-tensile and micro-indentation results showed tear initiation at the window–black PE matrix boundary; however, they did not confirm the mechanism of tear initiation. In support of this work, a method of making thin shavings of a whole pipe cross section was developed, and the best viewing windows under cross-polarized monochromatic light were identified. In addition, a phased array ultrasonic test (PAUT) and microwave imaging (MWI) were directly applied to the pipe and confirmed the presence and patterns of the windows.

Quantitative characterization of interfacial properties of carbon black/elastomer nanocomposites and mechanism exploration on their interfacial interaction

Carbon black (CB) is widely used as a good reinforcing filler in rubber industry. Due to the complex cluster structure of CB aggregate, it is difficult to clearly visualize its topological morphology and interfacial properties at nanoscale of CB/rubber composites. Thus, the good reinforcing mechanism of CB on rubber is still not fully understood. In this study, the surface topography structure of CB with different specific surface area (SSA) were characterized and their surface roughness were quantified using atomic force microscope (AFM). By using low content of CB and applying strong shear force to minimize the size of CB aggregate, the clear visualization of the bound rubber around CB aggregate was obtained using Quantitative Nanomechanical Mapping (QNM) technique of AFM (AFM-QNM). For the first time, the quantitative characterization of interfacial thickness and nano-mechanical modulus of CB/rubber composites were realized by AFM-QNM. Results show that the higher SSA of CB is mainly attributed to the higher surface roughness caused by the more complex topological structure of CB. And the higher surface roughness results in the higher interfacial thickness and Young's modulus at the nanoscale. Why CB with slightly smaller diameter shows largely increased reinforcing effect on rubber matrix is well explained.

Dynamic mechanical properties of magnetorheological polyurethane elastomers in comparison to existing antivibration rubbers

ABSTRACT This article primarily focused on dynamic mechanical analysis over a frequency range (0.1 to 140 Hz), temperature range (−100 to 50°C) and strain amplitude (0.1 to 5 percent). During hysteresis testing, the damping coefficient (Tanδ) and energy dissipation of isotropic and anisotropic magnetorheological elastomers with iron nanoparticles in a polyurethane rubber matrix to existing antivibration rubber were compared. Under tensile loading, energy dissipation was measured using universal testing. Different percentages of carbon black (CB) filler (30 phr, 50 phr and 70 phr) in a polyurethane matrix were selected for anti-vibration rubber comparison. During hysteresis testing, energy absorption has been found to be greater in CB Magnetorheological Elastomers(MREs) than in isotropic and anisotropic MREs, owing largely to the inclusion of CB in the formulation. CB additives were also tested on materials that were like anisotropic MREs. Relative comparative samples with the same percentage concentration of CB mixed with iron nanoparticles have greater damping characteristics and energy absorption. However, at the glass transition temperature (Tg), certain trends in energy absorption have shifted because segment flow motion of rubber chains has the greatest impact on energy absorption at glass transition temperature.

Fabrication and Characterization of the Porous Ti4O7 Reactive Electrochemical Membrane.

Preparation of the Magnéli Ti4O7 reactive electrochemical membrane (REM) with high purity is of great significance for its application in electrochemical advanced oxidation processes (EAOPs) for wastewater treatment. In this study, the Ti4O7 REM with high purity was synthesized by mechanical pressing of TiO2 powders followed by thermal reduction to Ti4O7 using the Ti powder as the reducing reagent, where the TiO2 monolith and Ti powder were separated from each other with the distance of about 5 cm in the vacuum furnace. When the temperature was elevated to 1333 K, the Magnéli phase Ti4O7 REM with the Ti4O7 content of 98.5% was obtained after thermal reduction for 4 h. Noticeably, the surface and interior of the obtained REM bulk sample has a homogeneous Ti4O7 content. Doping carbon black (0wt%-15wt%) could increase the porosity of the Ti4O7 REM (38–59%). Accordingly, the internal resistance of the electrode and electrolyte and the charge-transfer impedance increased slightly with the increasing carbon black content. The optimum electroactive surface area (1.1 m2) was obtained at a carbon black content of 5wt%, which increased by 1.3-fold in comparison with that without carbon black. The as-prepared Ti4O7 REMs show high oxygen evolution potential, approximately 2.7 V/SHE, indicating their appreciable electrocatalytic activity toward the production of •OH.

A Generalized Regression Neural Network Model for Predicting the Curing Characteristics of Carbon Black-Filled Rubber Blends.

In this study, a new generalized regression neural network model for predicting the curing characteristics of rubber blends with different contents of carbon black filler cured at various temperatures is proposed for the first time The carbon black contents in the rubber blend and cure temperature were used as input parameters, while the minimum and maximum elastic torque, scorch time, and optimal cure time, obtained from the analysis of 11 rheological cure curves registered at 10 various temperatures, were considered as output parameters of the model. A special pre-processing procedure of the experimental input and target data and the training algorithm is described. Less than 55% of the experimental data were used to significantly reduce the total number of input and target data points needed for training the model. Satisfactory agreement between the predicted and experimental data, with a maximum error in the prediction not exceeding 5%, was found. It is concluded that the generalized regression neural network is a powerful tool for intelligently modelling the curing process of rubber blends even in the case of a small dataset, and it can find a wide range of practical applications in the rubber industry.

Filler Influence on H2 Permeation Properties in Sulfur-CrossLinked Ethylene Propylene Diene Monomer Polymers Blended with Different Concentrations of Carbon Black and Silica Fillers.

Filler effects on H2 permeation properties in sulfur-crosslinked ethylene propylene diene monomer (EPDM) polymers blended with two kinds of carbon black (CB) and silica fillers at different contents of 20 phr–60 phr are investigated by employing volumetric analysis in the pressure exposure range of 1.2 MPa~9.0 MPa. A linear relationship is observed between the sorbed amount and pressure for H2 gas, which is indicative of Henry’s law behavior. The hydrogen solubility of EPDM composites increases linearly with increasing filler content. The magnitude of hydrogen solubility for the filled EPDM composites is dependent on the filler type. The hydrogen solubility is divided into two contributions: hydrogen absorption in the EPDM polymer and hydrogen adsorption at the filler surface. Neat EPDM reveals pressure-dependent bulk diffusion behavior. However, with increasing filler content, the diffusivity for the filled EPDM composites is found to be independent of pressure. The magnitude of filler effects on the hydrogen permeation parameter is measured in the order of high abrasion furnace CB~semireinforcing furnace CB ˃ silica, whose effect is related to the specific surface area of CB particles and interfacial structure. The correlation between the permeation parameters and filler content (or crosslink density) is discussed.

Microwave scattering behaviour of carbon black/ molybdenum di sulphide /cobalt composite for electromagnetic interference shielding application

Erasing signature of an object from an enemy's radar is, tactically, disruptive move achieved by the effective electromagnetic interference (EMI) shield. We report on the microwave scattering (2–18 GHz) behaviour of the nano-composite for architecting efficient shield composed of carbon black (CB), molybdenum di sulphide (MoS2) and cobalt (Co). Nano-composite, prepared by a facile, solid state synthesis route, are characterized using infrared, x-ray diffractometry, UV–visible, energy dispersive x-ray spectroscopic techniques including scanning electron microscopy. In infrared and Rayleigh analysis, formation of -C-Mo-C, OSO, Mo–O, and Co–O phases generated asymmetric polarization at low % CB content that gets transformed into a symmetric mode due to formation of Co–O and Co–S–C radicals at high CB % to cause maximum power losses. Possible polarization mechanism is discussed. In constitutive analysis, two-fold increase in the dielectric function, the dual behaviour (Debye and Jonscher) of the ac conductivity, and the synergistic magneto-dielectric coupling factor influenced the scattering performance of the composite. Broadly, at 18% composition, the shielding effectiveness is recorded to be > 97@14 GHz with 7.7 GHz of the bandwidth and the thickness ∼2.5 mm. The Dallenbach return loss is almost 75% revealing a high-performance shield design @18% CB/MoS2/Co nano-composite.