Effect Of Carbon Nanoparticles Research Articles

Molecular Dynamics Analysis of Surface-Modified Carbon Nanoparticle Reinforced Epoxy Resin.

Surface-modified carbon nanoparticles (CNPs) as reinforcement materials have attracted significant attention due to their potential for substantially enhancing mechanical properties. However, the development and application of CNP-enhanced polymeric materials are constrained by an incomplete understanding of their reinforcement mechanisms, impeding sustainable progress. In this study, we employed molecular dynamics simulations to investigate the mechanical properties of surface-modified CNP-reinforced epoxy resin composites at the microscopic scale. The simulations focused on the tensile process and the nanopinning effect of CNPs within the epoxy resin matrix. Our results indicate that surface-modified CNPs form stronger interfacial connections with the epoxy resin, leading to enhanced mechanical strength of the composites. Quantitative analysis revealed that these composites exhibit higher tensile strength compared to nonmodified counterparts, with a significant improvement in stability due to the robust noncovalent interactions between CNPs and the epoxy matrix. This study elucidates the reinforcement mechanisms of surface-modified CNPs in polymers, providing valuable insights for further optimization and sustainable development of CNP-reinforced polymeric materials.

The effect of carbon nanoparticles vs. immune colloidal gold technique test strips on parathyroid protection in total thyroidectomy: A randomized clinical trial study.

The long-term effect of intraoperative usage of carbon nanoparticles (CN) and parathyroid hormone (PTH) test strip using immune colloidal gold technique (ICGT) is unclear. This study aims to compare the effect of intraoperative usage of CN and ICGT test strips on PG function. This randomized clinical study involved adult patients who underwent total thyroidectomy. They were randomly allocated into three groups (control, CN, and ICGT group). Clinical data were analyzed. Each group involved 98 patients. Serum calcium and PTH concentrations at 24 h postoperatively (PTH24h) were higher in CN group. The parathyroid function recovered quicker in CN group. Use of CN increased in situ PG preservation and PTH24h. Mediation analysis indicated that 23.05% of the total effect of CN on PTH24h was attributed to PGRIS. CN holds promise to improve in situ PG preservation and protect PG vasculature, thereby reducing the incidence of early hypoparathyroidism. The value of ICGT test strips for PG protection is dubious.

Effect of carbon nanoparticles on the growth and photosynthetic property of Ficus tikoua Bur. plant.

The application of nanomaterials in different plants exerts varying effects, both positive and negative. This study aimed to investigate the influence of carbon nanoparticles (CNPs) on the growth and development of Ficus tikoua Bur. plant. The morphological characteristics, photosynthetic parameters, and chlorophyll content of F. tikoua Bur. plants were evaluated under four different concentrations of CNPs. Results indicated a decreasing trend in several agronomic traits, such as leaf area, branching number, and green leaf number and most photosynthetic parameters with increasing CNPs concentration. Total chlorophyll and chlorophyll b contents were also significantly reduced in CNPs-exposed plants compared to the control. Notably, variations in plant tolerance to CNPs were observed based on morphological and physiological parameters. A critical concentration of 50 g/kg was identified as potentially inducing plant toxicity, warranting further investigation into the effects of lower CNPs concentrations to determine optimal application levels.

Carbon nanoparticles beneficial for prophylactic central compartment lymph node dissection in cN0 papillary thyroid carcinoma

ObjectiveThis study explored prophylactic central compartment lymph node dissection (pCCLND) for patients with cN0 papillary thyroid carcinoma (PTC) and the effect of carbon nanoparticles (CNP) on surgical outcomes. MethodsThis retrospective study reviewed PTC cases treated at our tertiary medical institution between January 2019 and December 2022. Only patients with indications for total thyroidectomy and cN0 disease were included. CNP has been associated with a higher number of harvested lymph nodes and a lower rate of accidental parathyroid gland (PTG) removal. Patients who used CNP in this study were classified as group 1, while those who denied its use were classified as group 2. ResultsIn total, 116 cases were included, with 80 patients in group 1 and 36 in group 2. Most patients were in stage T1, with 68 (85.0 %) patients in group 1 and 31 (86.1 %) in group 2. Postoperative hoarseness occurred in 3 (3.8 %) patients in group 1 and 1 (2.8 %) in group 2, which recovered within two months. In group 2, 250 nodes were harvested, 72 (28.8 %) of which were metastatic; in group 1, 889 nodes were harvested, 316 (35.5 %) of which were metastatic; the difference regarding the rates of metastatic lymph nodes between the 2 groups was statistically significant (P = 0.047). Differences in postoperative blood calcium and parathyroid hormone levels between the two groups were statistically significant (P = 0.035 and P = 0.034, respectively). There were symptoms of hypocalcemia in 6 (16.7 %) patients in group 2 but in only 2 (2.5 %) in group 1, all of which recovered within three months; the difference was statistically significant (p = 0.017). ConclusionpCCLND is worth undertaking for cN0 PTC. CNP is beneficial for achieving more thorough dissection and reducing temporary hypoparathyroidism.

ANALYSIS OF RESEARCH ON THE PRODUCTION OF CARBON NANOPARTICLES AND THEIR APPLICATION IN TRIBOLOGY SYSTEMS

The article analyzes research on the production of carbon nanoparticles and their use in tribological systems. A comparison of the results of installations based on different methods of obtaining nanotubes and fullerenes shows that the purest and highest-quality product is obtained by laser evaporation of graphite, but this is a long, time-consuming and expensive process. The yield of useful products is up to 20 %. The thermal method has its advantages and disadvantages. The advantages include the availability and cheapness of carbon raw materials: from oil, carbon gases to municipal waste. All of them are sources of nanotubes and fullerenes when using the thermal method. The yield of useful nanoproducts is average, and the purity reaches 90-95 %. The simplest known method is the electric arc method for obtaining nanotubes and fullerenes. However, the yield of useful products does not exceed 15%. In addition, the large number of reactor designs for obtaining highly structured carbon nanoparticles indicates that an acceptable design has not yet been found that would guarantee obtaining a product with specified properties, stable parameters and in the required quantities. The article also analyzes research on the effect of carbon nanoparticles on the lubricating film, provides a calculation scheme for the interaction of a carbon nanoparticle with a metal surface in a friction pair, and provides a calculation model for the change in the adsorption time of carbon nanoparticles depending on the radius to the initial distance. Which showed that according to the experimental data of other researchers, the data obtained regarding the time of physical adsorption of individual molecules and their aggregates is about 10-9 to 10-6 seconds, which confirms the priority of the formation of the solvate shell, and only then the manifestation of the adsorption of carbon nanoparticles. The analysis of studies on the influence of carbon nanoparticles showed that there is a dependence for determining the intensity of wear of sliding friction pairs in elastic contact, which takes into account the concentration of carbon nanoparticles in the oil and the contact pressure. According to the obtained dependence, the intensity of wear is inversely proportional to the concentration of carbon nanoparticles, and directly proportional to the contact pressure.

Metabolic Profiling Analysis Uncovers the Role of Carbon Nanoparticles in Enhancing the Biological Activities of Amaranth in Optimal Salinity Conditions

Enhancing the productivity and bioactivity of high-functional foods holds great significance. Carbon nanoparticles (CNPs) have a recognized capacity for boosting both plant growth and the efficacy of primary and secondary metabolites. Furthermore, while salinity diminishes plant growth, it concurrently amplifies the production of phytomolecules. To ensure the robust and sustainable production of nutritious food, it becomes essential to elevate biomolecule yield without compromising plant growth. Here, we assessed the CNPs priming on plant performance and metabolites of the glycophyte amaranth (Amaranthus hypochondriacus) sprouts at the threshold salinity (25 mM NaCl; i.e., salinity that does not reduce growth but enhances the metabolites of that plant). We measured growth parameters, pigment levels, and primary (carbohydrates, amino acids, organic acids, fatty acids) and secondary metabolites (phenolics, flavonoids, tocopherols). CNP priming significantly improved biomass accumulation (fresh and dry weight) and primary and secondary metabolites of amaranth sprouts. Increased photosynthetic pigments can explain these increases in photosynthesis. Enhanced photosynthesis induced carbohydrate production, providing a C source for producing bioactive primary and secondary metabolites. The priming effect of CNPs further enhanced the accumulation of essential amino acids, organic acids, unsaturated fatty acids, tocopherols, and phenolics at threshold salinity. The increase in bioactive metabolites under threshold salinity can explain the CNP priming impact on boosting the antioxidant activities (FRAP, DPPH, anti-lipid peroxidation, superoxide-anion-scavenger, hydroxyl-radical-scavenger, Fe-chelating and chain-breaking activity in aqueous and lipid phases) and antimicrobial activities against Gram-positive and Gram-negative bacteria and fungi. Overall, this study suggested that threshold salinity and CNP priming could be useful for enhancing amaranth sprouts’ growth and nutritional quality.

Effect of Carbon Nanoparticles on the Porous Texture of ι-Carrageenan-Based N-Doped Nanostructured Porous Carbons and Implications for Gas Phase Applications

S and N double-doped high surface area biomass-derived carbons were obtained from marine biomass-derived ι-carrageenan. Adding carbon nanoparticles (CNPs), namely graphene oxide (GO) or carbon nanotubes (CNTs), in the early stage of the synthesis leads to a modified porous texture and surface chemistry. The porous textures were characterized by N2 (−196.15 °C) and CO2 (0 °C) isotherms. The best GO- and CNT-added carbons had an apparent surface area of 1780 m2/g and 1170 m2/g, respectively, compared to 1070 m2/g for the CNP-free matrix. Analysis of the Raman spectra revealed that CNT was more efficient in introducing new defects than GO. Based on XPS, the carbon samples contain 2–4.5 at% nitrogen and 1.1 at% sulfur. The Dubinin–Radushkevich (DR) and Henry models were used to assess the strength of the interactions between various gases and the surface. The N2/H2 and CO2/CH4 selectivities were estimated with ideal adsorbed solution theory (IAST). While the CNPs, particularly GO, had a remarkable influence on the porous texture and affected the surface chemistry, their influence on the separation selectivity of these gases was more modest.

Improved electro-optical and dielectric properties of polymer dispersed liquid crystal doped with disperse dye red 1 and carbon nanoparticles

ABSTRACT Disperse dye red 1 (DR1) and carbon nanoparticles (CNPs) were doped separately to form polymer dispersed liquid crystal films, namely, DPDLC & CPDLC. Nematic liquid crystal (LC) and photopolymer NOA-65 were used to prepare these composite films using polymerisation-induced phase separation (PIPS) technique. In this research work, it is demonstrated that the minute concentration (0.05% wt./wt.) of DR1 and CNPs controls the LC droplet alignment and LC droplet size in polymer dispersed liquid crystal (PDLC) film. The effect of DR1 and CNPs on PDLC film has been investigated in terms of LC droplet size, transition temperature, voltage-transmittance characteristic, contrast ratio, response time, haze, and dielectric measurements. The obtained results reveal that the threshold voltage values of the composite film get reduced from 34.87 V (undoped) to 10.19 and 9.26 V, for 0.05% of DR1 and CNPs doping, respectively. The DR1 (0.05%) doped film shows improved contrast of the undoped film as compared to CNPs (0.05%) film, whereas CNPs (0.05%) doped film shows a faster response time of 2.81 ms as compared to DR1 (0.05%) doped film (3.14 ms). Dielectric analysis of undoped, DPDLC, and CPDLC films represents Debye type relaxation mode.

Effect of Carbon Nanoparticles in Biochar and Sulphur as a Foliar Spray on Onion Plants: A New Orientation

Biochar contains raw carbon nanoparticles. Water-soluble dried carbon powder nanoparticles (wsCNPs) isolated from leftover biomass (waste stems and roots) in agricultural land can enhance the overall growth rate of onion (Allium cepa L.) plants. Field experiments conducted in 2017–2018 and 2018–2019 aimed to evaluate the effect of wsCNPs and sulfur as a foliar spray on vegetative growth, yield, and some nutritional values of onion plants. The biochar used in the study solution, namely, wsCNPs, was applied at 300, 400, and 500 mg/L incorporated with three levels of 2.5, 3.5, and 4.5 g/L of sulfur (Thiovit, 80%) as a foliar spray. Results indicated that treated plants with all levels of wsCNPs and sulfur had significantly higher values of vegetative growth parameters, photosynthetic pigments, yield, bulb quality, and phytochemical compounds compared with untreated plants. Using the highest foliar spray level of wsCNPs and sulfur obtained significant results for all evaluated characteristics among other levels. This increment was more pronounced when wsCNPs and sulfur were combined, indicating that spraying is a useful agriculture and eco-friendly practice for sustainable crop production.

An Investigation on The Effect of Carbon Nanoparticles on The Properties of Carbon Brushes

The demand for carbon brushes with specific properties and improvements in production economics in recent years has led to increased interest in metal-graphite composites. Metal matrix composites are considered excellent materials to obtain properties superior to those of the constituent phases and meet the specific requirements of material application. In the present study, we suggested a new composite material by utilizing nanomaterials to improve the properties of metal-graphite composite material usually used as carbon brushes. This has been achieved by adding different percentages of 0.1-0.5wt % of carbon nanotubes, carbon nanospheres, or both to the metal matrix composite. The samples were prepared by powder metallurgy technique. The XRD results gave a sharp line and indicated a high crystalline structure and little amorphous, which improved the conductivity performance of the composite produced within the structure of this work. The density measurement chart results showed an increase in the amounts of the carbon nano additives leading to a decrease in the density of the sample. The investigation of nano additives on hardness showed that increases in the additive led to reduced hardness. On the other hand, the resistivity values have reduced gradually when there is an increase in the amounts of the carbon nano additives, especially on the CNT, which gives better results than CNS, which we obtained the resistivity value =(0.32 Ωcm), Comparing with commercial-grade containing free of nano additives (1.3Ω cm).

Effect of Carbon Nanoparticles with Different Structural Organization on the Biological Systems of Escherichia coli K12 TGI

Effect of Carbon Nanoparticles with Different Structural Organization on the Biological Systems of Escherichia coli K12 TGI

Nanobiophotonics. Effect of carbon nanoparticles on the optical and spectroscopic properties of Cichorium intybus leaves

The effect of different types of nanoparticles on plants has been of great interest in recent years. Within this general context, the specific purpose of the present work was to study the interaction between carbon nanoparticles and the photosynthetic electron chain, to determine whether they induced a beneficial or toxic effect on the primary steps of photosynthesis. Two types of nanoparticles were synthesized and physicochemically characterized: nanocarbon black (nano-CB) and graphene quantum dots (GQD). They were sprayed over Cichorium intybus leaves and their effect on the photosynthetic chain was studied using chlorophyll-a fluorescence analysis. Nano-CB was prepared by an acid exfoliation method from commercial carbon black, whereas GQD were obtained by pyrolysis of L-glutamic acid. The nanoparticulate systems displayed luminescent properties and the fluorescence quantum yield for GQD resulted about six times higher than the value for nano-CB. Both kind of nanoparticles presented similar effects on the plant leaves, but the action of GQD was more pronounced. They induced an evident decrease in the content of photosynthetic pigments, a reduced xanthophyll cycle and a lower ability to dissipate excess energy by non-photochemical quenching. Changes in the concentration ratios Chlorophyll a/b and Chlorophylls/Carotenoids were similar to those previously found for shaded leaves but could not be assigned to shading effects in this case. The results of this work suggested a particular deleterious action on the performance of photosystem I (PSI). The phytotoxicity of the tested carbon nanoparticles on Cichorium intybus, at the level of the primary photosynthesis stages was, thus, demonstrated.

Effect of Carbon Nanoparticles on the Performance Efficiency of a Solar Water Heater

Carbon nanoparticles are prepared by sonication using carbon black powder. The surface morphology of carbon black (CB) and carbon nanoparticles (CNPs) is investigated using scanning electron microscopy (SEM). The particles size ranges from 100 nm to 400 nm for CB and from 10 nm to 100 nm for CNPs. CNPs and CB are mixed with silicon glue of different ratios of 0.025, 0.2, 0.05, and 0.1 to synthesis films. The optical properties of the prepared films are investigated through reflectance and absorbance analyses. The ratio of 0.05 for CNPs and CB is the best for solar paint because of its higher solar water heater efficiency and is then added to the silicon glue . Temperature of cold water and temperature of hot water in storage tank were tabulated on hourly basis with the help of an Arduino device. The atmospheric temperature was also noted. It was observed that outlet temperature of water was attained up to 75°C as compared to the inlet water temperature of 23°C for the tank applied with CNP-based paint. The tank applied with CNP-based paint has 4 °C higher water temperature than that coated with CB-based paint after 1 month of test under sun irradiation. Based on the results, the efficiency of a solar water heater depends on the difference in temperature of inlet water and outlet of heater. The efficiency of the solar water heater coated with CNPs is around 77% but the solar water heater coated with CB has an efficiency of 67%.

Effect of Carbon Nanoparticles on the Structure and Properties of Melt-Extruded R-BAPB Polyimide Fibers

Effect of Carbon Nanoparticles on the Structure and Properties of Melt-Extruded R-BAPB Polyimide Fibers

Effect of Carbon Nanoparticles on Properties of Polyetherimide Fibers

In the present work, fibers based on heat-resistant amorphous polyimide brand Ultem-1000 were prepared by melt extrusion. Vapor-grown carbon nanofibers (VGCFs) and single-wall carbon nanotubes (SWCNTs) were used to increase the mechanical characteristics of the polymer fibers. The fibers were characterized by scanning electron microscopy (SEM), thermophysical and mechanical tensile analysis. SEM study revealed very good distribution of the carbon nanofillers throughout the polyimide fiber volume. The mechanical testing of the unoriented nanocomposite fibers showed that the introduction of VGCFs or SWCNTs led to an increase in tensile strength and modulus. High-temperature drawing allows obtaining polyimide nanocomposite fibers with significantly increased mechanical properties (»300 MPa for strength and »4.6 GPa for modulus).

Experimental and DFT studies on the effect of carbon nanoparticles on asphaltene precipitation and aggregation phenomena

• CNPs were synthesized for controlling asphaltene precipitation and aggregation. • FESEM and FTIR demonstrate uniform adsorption of asphaltene on surface of CNPs. • DFT modeling proves the strong hydrogen interaction between CNPs and asphaltenes. • CNPs represent biocompatible and affordable asphaltene inhibitor-dispersant. In this study, a new class of carbon nanoparticles (CNPs) is synthesized for inhibition/dispersion of asphaltene precipitation and aggregation in unstable crude oil. The microscopy and asphaltene dispersant experiments are carried out to assess the effects of CNPs on asphaltene precipitation and aggregation. Also, density functional theory is applied to describe the mechanisms of asphaltene adsorption onto the CNPs surfaces. Experimental results demonstrate postponement of asphaltene onset of precipitation from 26 to 37 vol% n-C 7 in the presence of 400 ppm of the CNPs which is ascribed to the extra high specific surface area of the CNPs. DLS analysis shows the average size of asphaltene aggregates adsorbed onto the CNPs reduces from 1730 nm in the blank oil to 255 nm in treated oil with CNPs. The results of DFT modeling demonstrate the strong hydrogen interaction between functional groups of the CNPs and active sites of asphaltene. Also, π–π interactions occur between electron cloud of aromatic rings of asphaltene and CNPs with minimum equilibrium distance of 2.94 Å. The adsorption energy for the most stable complex of asphaltene and CNPs in the gas and solvent phases are −91.22 and −107.64 kJ/mol, respectively, confirming the strong chemisorption of asphaltene over the CNPs. This research reveals that synthesized CNPs with specific features such as high surface area, potential of covering the external shell with a wide variety of functional groups, low toxicity and cost, and environment-friendly can be successfully implemented as an efficient inhibitor and/or dispersant for asphaltene handling strategies.

Si3N4-TiN loaded carbon coating with porous structure as broadband light superabsorber for uncooled IR sensors

A carbon nanoparticles (CNP), Si3N4 and TiN nanoparticles loaded porous structure carbon microparticles (CMP) coating (CMP/CNP-Si3N4-TiN) as broadband light superabsorber is proposed for the infrared absorber layer of uncooled infrared sensor with high sensitivity in the 3–5 μm and 8–14 μm atmospheric windows, which is suited for use as non-dispersive infrared (NDIR) gas sensors and non-contact infrared thermometers. The CMP, Si3N4 and TiN nanoparticles were added in sequence to the nanocarbon-based ink, and then prepared into a broadband light superabsorber coating by high voltage electrostatic spraying. Scanning electron microscopy (SEM) micrographs showed that the framework of porous coating was made up of a large number of charged CMP which repel each other during high voltage electrostatic spraying and that the CNP in the initial ink, Si3N4 and TiN nanoparticles reunited with the CMP together commendably. The experimental results and corresponding analyses illustrated that the distinctive CMP porous structure with arbitrary sizes and random spatial positions created guided mode for manipulation of incident light waves and almost completely absorbed the photons of light over wide range of wavelengths. The CNP, Si3N4 and TiN nanoparticles can provide multiple reflections and scatterings, which made the light propagation path increase, resulting in an extensive absorption enhancement. Benefited from the synergetic effect of CMP, CNP, Si3N4 and TiN, the CMP/CNP-Si3N4-TiN coating exhibited 93.8% and 92.6% absorption at 3–5 μm and 8–14 μm, respectively. Finally, the modified thermopile infrared (IR) sensor with CMP/CNP-Si3N4-TiN coating presented output voltage amplitudes of 1170 mV, which was 62.5% higher than that of the reference thermopile IR sensor.

THROMBOGENICITY OF SHUNGITE CARBON NANOPARTICLES IN VITRO

When nanoparticles enter a living organism, it is very likely they will appear in the bloodstream, which raises the question of the hemocompatibility of various nanomaterials. The effect of carbon nanoparticles (shungite nanocarbon and nanodiamonds) on the human and mink blood coagulation system in vitro was studied. The time of plasma clotting triggered by recalcification was used as a test parameter for assessing the state of the internal coagulation system activation pathways. The effect of shungite nanocarbon at 3 to 6 μg/ml concentrations on the activity of the human coagulation system manifest itself in a significant decrease in the recalcification time. When carbon nanoparticles were added to the mink plasma, a significant decrease in the recalcification time was observed starting at a concentration of 6 μg/ml. The presence of nanodiamonds in the 9 μg/ml concentration significantly accelerated the formation of a human plasma clot. We suppose that hypercoagulation in the presence of shungite carbon and nanodiamonds can be associated with a faster fibrin polymerization. This may be a result of fibrin interaction with shungite carbon nanoparticles and nanodiamonds, which can thus induce platelet activation and/or aggregation. The molecular mechanism behind the revealed thrombogenicity of carbon nanoparticles is discussed.

Carbon nanoparticles influence photomorphogenesis and flowering time in Arabidopsis thaliana.

Inclusion of carbon nanoparticles in growth medium accelerates timing to flower by down-regulating phytochrome B in a CONSTANS-independent but photoperiod-dependent manner in Arabidopsis thaliana. Despite the recognized importance of nanoparticles in plant development over the last decade, the effect of carbon nanoparticles (CNPs) on plant processes such as photomorphogenesis and flowering time control is poorly understood. We explored the uptake, accumulation and effect of CNPs on seedling development and flowering time control in Arabidopsis thaliana (At). CNPs uptake was demonstrated using Raman spectroscopy and light microscopy that affected At seedling growth and flowering time in a dose-dependent manner. The highest accumulation of CNPs was observed in leaves followed by stem and root tissues. CNPs treatment enhanced seed germination, showed elongated hypocotyl, larger cotyledon area and increased chlorophyll content in At seedlings. CNPs treatment induced early flowering in both long-day and short-day growth conditions indicating a photoperiod-dependent effect. CNPs-treated seedlings showed a drastic reduction in the relative abundance of phytochrome B (PHYB) transcript. Further, we analyzed the transcript abundance of at least one major component involved in various pathways that regulate flowering such as (1) photoperiod, (2) gibberellic acid (GA), (3) vernalization and (4) autonomous. An up-regulation of transcript levels of PHYTOCHROME INTERACTING FACTOR 4 (PIF4), GIGANTEA (GI), REPRESSOR OF GIBBERELLIC ACID 1 (RGA1) and LEAFY (LFY) were observed, however, there were no changes in the transcript levels of CONSTANS (CO), VERNALIZATION 1 (VRN1) and FLOWERING CONTROL LOCUS A (FCA). Despite the up-regulation of RGA1, we conclude that the earlier flowering is most likely GA-independent. Here, we demonstrated that the early flowering in CNPs-treated seedlings was PHYB and photoperiod-dependent.

Ultraviolet Protection Action of Carbon Nanoparticles in Leaves

Carbon nanoparticles (CNPs) have been explored widely in many fields of science and technology owing to its unique physical, chemical, mechanical, and biological properties. The interaction of the visible region of the electromagnetic radiation with plants and their role in photosynthesis is well studied. The antenna pigments in the protein matrix of thylakoid play a significant role in energy transport mechanism involved in photosynthesis. The energy absorbed by the proteins in the UV region also involves in the energy transport. The present work is aimed to understand the absorption of radiation by leaves in the ultraviolet (UV) region and the impact of CNPs produced by internal combustion diesel engines (ICE) in altering the absorbance level. The effect of CNPs is found to lower the UV absorbance by leaves and thus acting as UV shield, protecting the leaves from cell damages. The characterization of the CNP and leaves is done by field emission scanning electron microscope (FESEM) and UV-visible spectrophotometer.