Artigos de revistas: "Nano-additives"

1

Bhat, Faheem Sadiq, e Mohammad Shafi Mir. "Study Investigating the Influence of Warm-Mix Asphalt Additives on Rutting and Fatigue Performance of Nano-Modified Asphalt Binders". Transportation Research Record: Journal of the Transportation Research Board 2676, n.º 4 (6 de janeiro de 2022): 719–31. http://dx.doi.org/10.1177/03611981211064995.

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The current study investigates the synergized effect of a nanomaterial and two warm mix additives asphalt (WMA) additives on different properties of asphalt binders. The study used an optimal percentage of 2% for nano-Al2O3; two WMA additives were used in different concentrations. The results revealed that the addition of WMA additives increased the softening point of nano-Al2O3 modified asphalt binder. Penetration and ductility results showed a decrease after the introduction of WMA additives. The viscosity of nano-Al2O3 modified asphalt binders showed a reduction after the introduction of WMA additives. Rutting evaluation was done by using the superpave rutting parameter and multiple stress creep and recovery (MSCR) test. The fatigue performance of the asphalt binders was measured using the superpave fatigue parameter and linear amplitude sweep (LAS) test. Results showed that the introduction of WMA additives improved the rutting and fatigue performance of nano-Al2O3 modified asphalt binders. The introduction of WMA additives enhanced the aging performance of the nano-Al2O3 modified asphalt binders.

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Zhao, Yan Hui, Xi Liang Dai e Jia Xi Zhang. "Research on Properties of Automobile Lubricant Containing Nano-Ceramic Additives". Advanced Materials Research 503-504 (abril de 2012): 700–704. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.700.

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This paper makes road test on two kinds of engine lubricant, one contains nano-ceramic additives, and one does not. Results show that the lubricant containing nano-ceramic additives can fully meet the requirements of automotive engine, and nano-ceramic lubricant is superior in anti-wear properties to other lubricant in experiment, and nano-ceramic additives can improve the anti-wear properties of lubricant.

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Liu, Yue, Chuan Zhen Huang, Han Lian Liu, Bin Zou, Peng Yao e Liang Xu. "Effect of Nano-Additives on Microstructure and Mechanical Properties of Ti(C,N)-TiB₂-WC Composite Ceramic Cutting Tool Materials". Key Engineering Materials 589-590 (outubro de 2013): 337–41. http://dx.doi.org/10.4028/www.scientific.net/kem.589-590.337.

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Ti(C,N)-TiB2-WC composite ceramic cutting tool materials with nano-scale additives Ni and Mo, and micro-scale additives Ni and Mo as sintering aids were sintered respectively at a temperature of 1550 °C for holding time of 1hour in vacuum by a hot-press technique. The effects of nano-scale additives Ni and Mo, and micro-scale additives Ni and Mo on microstructure and mechanical properties of composites were compared and investigated. It is concluded that the wettability of nano-scale Ni and Mo to the composites is better than that of micro-scale Ni and Mo. The nano-scale whiskers were found in the composite ceramic tool materials with nano-scale additives. The addition of nano-scale Ni and Mo instead of micro-scale Ni and Mo could make the ﬂexural strength and fracture toughness of Ti(C, N)-TiB2 –WC composites have a promotion, but could not make the hardness of the composites increase in this study.

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Shi, Shih-Chen, e Xiao-Ning Tsai. "Cellulose derivative as protection coating: Effect of nanoparticle additives on load capacity". Teknomekanik 5, n.º 2 (15 de dezembro de 2022): 90–96. http://dx.doi.org/10.24036/teknomekanik.v5i2.16372.

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The cellulose derivative hydroxypropyl methylcellulose (HPMC) has recently been extensively studied and used in mechanical applications. However, the softness and susceptibility to deformation of HPMC limited its further applications. In this study, metal nanoparticles (nano-aluminum and nano-copper) and nano-metal oxide particles (nano-alumina and nano-copper oxide) were used as additives to HPMC to form a composite film with improved mechanical properties, particularly load capacity. The addition of high levels of additives provided a higher load capacity. Among the nano-additives used in the study, Cu (2 wt.%) provided the composite with the highest load capacity, improving the load capacity of pure HPMC by 250%. The surface treatment of strengthening additives is an important step. Adding specific high-strength and high-modulus metal and metal oxide additives to the soft HPMC matrix can effectively improve the load-bearing capacity of the composite material. This study proposes a simple evaluation method for the load-bearing capability of the coating as well.

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Mirzababaei, Mehdi, Jafar Karimiazar, Ebrahim Sharifi Teshnizi, Reza Arjmandzadeh e Sayed Hessam Bahmani. "Effect of Nano-Additives on the Strength and Durability Characteristics of Marl". Minerals 11, n.º 10 (12 de outubro de 2021): 1119. http://dx.doi.org/10.3390/min11101119.

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Low bearing capacity soils may pose serious construction concerns such as reduced bearing capacity and excessive hydro-associated volume changes. Proper soil remediation techniques must be planned and implemented before commencing any construction on low bearing capacity soils. Environmentally friendly soil stabilizers are gradually replacing traditional soil stabilizers with high carbon dioxide emissions such as lime and cement. This study investigated the use of an alternative pozzolanic mix of nano-additives (i.e., nano-silica and nano-alumina) and cement to reduce the usage of cement for achieving competent soil stabilization outcomes. A series of unconfined compressive strength (UCS), direct shear, and durability tests were conducted on marl specimens cured for 1, 7, and 28 days stabilized with nano-additives (0.1~1.5%), 3% cement, and combined 3% cement and nano-additives. The UCS and shear strength of stabilized marl increased with nano-additives up to a threshold nano-additive content of 1% which was further intensified with curing time. Nano-additive treated cemented marl specimens showed long durability under the water, while the cemented marl decomposed early. The microfabric inspection of stabilized marl specimens showed significant growth of calcium silicate hydrate (CSH) products within the micro fabric of nano-silica treated marl with reduced pore-spaces within aggregated particles. The results confirmed that nano-additives can replace cement partially to achieve multi-fold improvement in the strength characteristics of the marl.

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Gavhane, R. S., A. M. Kate, Manzoore Elahi M. Soudagar, V. D. Wakchaure, Sagar Balgude, I. M. Rizwanul Fattah, Nik-Nazri Nik-Ghazali et al. "Influence of Silica Nano-Additives on Performance and Emission Characteristics of Soybean Biodiesel Fuelled Diesel Engine". Energies 14, n.º 5 (9 de março de 2021): 1489. http://dx.doi.org/10.3390/en14051489.

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The present study examines the effect of silicon dioxide (SiO2) nano-additives on the performance and emission characteristics of a diesel engine fuelled with soybean biodiesel. Soybean biofuel was prepared using the transesterification process. The morphology of nano-additives was studied using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). The Ultrasonication process was used for the homogeneous blending of nano-additives with biodiesel, while surfactant was used for the stabilisation of nano-additives. The physicochemical properties of pure and blended fuel samples were measured as per ASTM standards. The performance and emissions characteristics of different fuel samples were measured at different loading conditions. It was found that the brake thermal efficiency (BTE) and brake specific fuel consumption (BSFC) increased by 3.48–6.39% and 5.81–9.88%, respectively, with the addition of SiO2 nano-additives. The carbon monoxide (CO), hydrocarbon (HC) and smoke emissions for nano-additive added blends were decreased by 1.9–17.5%, 20.56–27.5% and 10.16–23.54% compared to SBME25 fuel blends.

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C, Vijayakumar, Murugesan A, Subramaniam D e Panneerselvam N. "An Experimental Investigation of Diesel Engine Fuelled with MgO Nano Additive Biodiesel - Diesel Blends". Bulletin of Scientific Research 1, n.º 2 (16 de novembro de 2019): 28–34. http://dx.doi.org/10.34256/bsr1924.

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In this experimental investigation compacts the performance and emissions of compression ignition engines fuelled with MgO nano additive, maducaindica bio diesel blends were examined. Based upon the previous literatures only 20% mahuca methyl ester fuel blends without nano additives is suitable for compression ignition engine without affecting engine efficiency and its characteristics. In this paper magnesium oxide nano additives are added into the 40% Mahucaindica biodiesel- diesel blends at the rate of 50ppm for developing the test fuels. In this nano additives improve the properties of diesel fuel like viscosity, calorific value and decreased the flash point and fire point. Then compared the performance and emissions differences of all blended fuels used as a fuel in a diesel engine. The observation of results, 40MgO + 50ppm blended fuels brake thermal efficiency is improved then CO, HC, CO2and smoke decreased compared to other fuel blends. The results are taken into account, a blend of 40MgO+ Mgo50ppm is the best blend ratio compared than other blends with nano additives.

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Li, Ting, Xianggang Chen, Junhai Wang, Lixiu Zhang, Xiaoyi Wei, Libo Zhao e Mengzhou Ma. "Research progress of nano lubricating additives". IOP Conference Series: Earth and Environmental Science 680, n.º 1 (1 de março de 2021): 012084. http://dx.doi.org/10.1088/1755-1315/680/1/012084.

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Gladunova, O. I., V. A. Lysenko, O. V. Astashkina, A. A. Lysenko e V. N. Dokuchaev. "Polyoxadiazole fibers modified by nano-additives". Russian Journal of General Chemistry 83, n.º 1 (janeiro de 2013): 164–68. http://dx.doi.org/10.1134/s1070363213010362.

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Reddy, P. Ravi Kanth, Duvvuru Yasaswini, P. Pandu Ranga Reddy, Mohamed Zeineldin, M. J. Adegbeye e Iqbal Hyder. "Applications, challenges, and strategies in the use of nanoparticles as feed additives in equine nutrition". August-2020 13, n.º 8 (2020): 1685–96. http://dx.doi.org/10.14202/vetworld.2020.1685-1696.

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The rapid expansion of nanotechnology has been transforming the food industry by increasing market share and expenditure. Although nanotechnology offers promising benefits as feed additives, their usage in equines is primarily geared toward immunotherapy, hyper-immunization techniques, drug delivery systems, grooming activities, and therapeutic purposes. Nanoparticles could be engaged as alternatives for antibiotic feed additives to prevent foal diarrhea. Gold nanoparticles are proved to provide beneficial effects for racehorses by healing joint and tendon injuries. Because of the poor bioavailability of micro-sized mineral salts, the usage of nano-minerals is highly encourageable to improve the performance of racehorses. Nano-Vitamin E and enzyme CoQ10 for equines are no longer a simple research topic because of the increased commercial availability. Employing nanotechnology-based preservatives may offer a promising alternative to other conventional preservatives in preserving the quality of equine feed items, even during an extended storage period. While nanoparticles as feed additives may provide multitudinous benefits on equines, they could elicit allergic or toxic responses in case of improper synthesis aids or inappropriate dosages. The safety of nano-feed additives remains uninvestigated and necessitates the additional risk assessment, especially during their usage for a prolonged period. To adopt nano-feed additives in horses, there is an extreme paucity of information regarding the validity of various levels or forms of nanoparticles. Further, the currently available toxicological database on the topic of nano-feed additives is not at all related to equines and even inadequate for other livestock species. This review aims to provide new insights into possible future research pertaining to the usage of nano-feed additives in equines.

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Rasin, Fadhil A., Laith K. Abbas e Mohammed J. Kadhim. "Study the Characterizations of Cement Mortar by Nano Pozzolanic Materials Additions". Al-Khwarizmi Engineering Journal 13, n.º 4 (1 de dezembro de 2018): 152–63. http://dx.doi.org/10.22153/kej.2017.06.004.

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This study involves adding nano materials and interaction with cement mortar behavior for several mortar samples under variable curing time with constant water to cement ratio (W/C = 0.5). The effects of adding nano materials on the microstructure of cement mortar were studied by (Scanning Electronic Microscopy (SEM) and X-Ray (for samples at different curing time 28 and 91 days. Small ratio replacements of nano particles (SiO2 or Al2O3) were added to Ordinary Portland Cement (OPC) type (I). The percentage of nano materials additives replacement by weight of ordinary Portland cement includes (1, 2, 3, 4 and 5%) for both types of nano materials with constant (W/C) ratio, also the amount of the fine aggregate used was three times the amount of cement. The results showed that, the mortar consist of both nano materials had better microstructure than mortar without nano materials in all test. Best enhancements in properties and microstructure for mortars with nano silica were achieved with (3%) additives while were achieved with nano alumina at (2%) additives.

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12

Zhu, Yi Min, Bin Bin Luo, Shu Chao Wan, Zhi Jun Ma e Yan Jun Li. "Influence of Organic Additives on Shape and Adsorbing Properties of Nano-Fe₃O₄ Particles". Advanced Materials Research 454 (janeiro de 2012): 41–45. http://dx.doi.org/10.4028/www.scientific.net/amr.454.41.

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Nano-Fe3O4 powders were prepared by chemical co-precipitation method. The granularity, morphology and absorbing properties of the magnetite nanoparticles were characterized by XRD, SEM, TEM and complex permeability. The effects of organic additives to the granularity, morphology and microwave absorption property of nanosized magnetic Fe3O4 were studied. The results show that the organic additives have great influence on the morphology of nano-Fe3O4 particles. Spherical nano-Fe3O4 is prepared by oxalic acid. And the absorption property of nano-Fe3O4 is better.

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Patel, Jankhan, e Amirkianoosh Kiani. "Tribological Capabilities of Graphene and Titanium Dioxide Nano Additives in Solid and Liquid Base Lubricants". Applied Sciences 9, n.º 8 (19 de abril de 2019): 1629. http://dx.doi.org/10.3390/app9081629.

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In this study, the tribological behavior of both liquid (oil) and semi-liquid (grease) lubricants enhanced by multilayer graphene nano platelets and titanium dioxide nano powder was evaluated using ball-on-disk and shaft-on-plate tribo-meters. Oil samples for both 2D graphene nano platelets (GNP) and titanium nanopowders (TiNP) were prepared at three concentrations of 0.01 %w/w, 0.05 %w/w and 0.1 %w/w. In addition, 0.05% w/w mixtures of GNP and TiNP were prepared with three different ratios to analyze collective effects of both nano additives on friction and wear properties. For semi-liquid lubricants, 0.5% w/w concentrations were prepared for both nano additives for shaft-on-plate tests. Viscosity and oxidation stability tests were conducted on the liquid-base lubricants. Nano powders of both additive and substrate were analyzed using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). In addition, Raman spectroscopy was conducted to characterize the graphene and titanium dioxide. The study shows that adding graphene and titanium dioxide individually sacrifices either the wear or friction of lubricants. However, use of both additives together can enhance friction resistance and wear preventive properties of a liquid lubricant significantly. For a semi-liquid lubricant, the use of both additives together and individually reduces friction compared to base grease.

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Sule, Ahmed, Zulkarnain Abdul Latiff, Mohammed Azman Abbas, Ibham Veza e Anthony C. Opia. "Recent Advances in Diesel-Biodiesel Blended with Nano-Additive as Fuel in Diesel Engines: A Detailed Review". Automotive Experiences 5, n.º 2 (18 de abril de 2022): 182–216. http://dx.doi.org/10.31603/ae.6352.

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Global emission of gases has increased rapidly due to higher combustion of fossil fuels arising from increasing world population which has led to a greater number of manufacturing industries and ‘on-road vehicle (ORV)’ users. Researchers have attributed cause of global warming to gases emissions which correspondingly lead to climate change with devastating repercussions. Currently, climate change is a general issue and world leaders have been tasked to cut down emissions of gases that directly affect the ecosystem and influence climate change. Biodiesel which is an alternative to fossil fuels face many challenges and to tackle some limitations with biodiesel researchers blends biodiesels in various proportional ratio to diesel fuel. This paper, therefore, concentrates on reviewing the use of additives specifically nano-additives by researchers recently to alter and boost desired characteristics in diesel-biodiesel fuel; it also examines the synthesis of nano-additives; challenges, and advances made. This paper further analysed, reviewed, and compared recent results from nano-additive use with respect to emissions, fuel consumption, brake thermal efficiency, and engine power, establishes the merits and demerits of diverse nano-additives, and finally presents a conclusive opinion on nano-additive usage with diesel fuels in diesel engines.

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Chen, Min, W. S. Cheng, Zu Xin Zhao e X. B. Huang. "Study of Compatibility of the Nano Lubricating Additives with the Electroless Deposited Ni-W-P Coating". Applied Mechanics and Materials 29-32 (agosto de 2010): 630–35. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.630.

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Tribological properties as well as antiwear and friction reduction mechanism of wear self repair nano-ceramic and nano-Cu lubricating additives are researched using ring-block abrasion testing machine and Energy Dispersive Spectrometer. Research results show great difference between friction reduction performances of the above two additives, because their friction reduction mechanism are different, the former is ball bearing effect and the latter is soft film shear effect. In terms of wear-resistance, as for 45 steel, under heavy load, the self repair rate to the worn surface with the nano additives is less than the wearing rate of the friction pair. An effective way to solve the problem is electroless deposited Ni-W-P alloy coating on the surface of the 45 steel. The Ni-W-P alloy coating has high hardness, high wear resistance, and has excellent compatibility with nano lubricating additive, the wear resistance of Ni-W-P alloy coating (with heat treatment and the oil with nano additives) has increases hundreds times than 45 steel as the metal substrate with basic oil, zero wear is achieved, which break through the bottleneck of previous separate research of the above-mentioned the two.

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Chen, Yue Jun, Zhi Fa Wang, Jing Long Bu, Li Xue Yu, Rong Lin Wang e Rui Sheng Wang. "Effect of Rare Earth Nano-Oxides on Sintering and Crystallization of Fused Quartz Ceramic Materials". Advanced Materials Research 295-297 (julho de 2011): 1418–21. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.1418.

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Fused quartz powder (size<0.04mm) was used as raw material, nano-Y2O3, nano-CeO2and nano-La2O3(size<0.08μm) were dividedly used as additives with dosage of 2% each. Fused quartz ceramic materials were sintered in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1h. The effect of rare earth nano-oxides on sintering and crystallization of the fused quartz ceramic were researched by measurements of apparent porosity, bending strength and thermal expansion rate, and analyses of XRD and SEM. The results showed that additives nano-Y2O3, nano-CeO2and nano-La2O3had obvious effect of inhibiting crystallization of fused quartz, and the samples added nano-Y2O3and nano-La2O3were better. Sample added nano-Y2O3had least thermal expansion rate. Sample added nano-La2O3had higher bending strength, and it showed that nano-La2O3had better effect on sintering of fused quartz ceramic. It can be deduced that nano-La2O3plays the excellent role as the crystallization inhibitor of fused quartz materials.

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Lv, Junshuai, Su Wang e Beibei Meng. "The Effects of Nano-Additives Added to Diesel-Biodiesel Fuel Blends on Combustion and Emission Characteristics of Diesel Engine: A Review". Energies 15, n.º 3 (29 de janeiro de 2022): 1032. http://dx.doi.org/10.3390/en15031032.

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How to improve the combustion efficiency and reduce harmful emissions has been a hot research topic in the engine field and related disciplines. Researchers have found that nano-additives to diesel-biodiesel fuel blends have achieved significant results. Many research results and both current and previous studies on nanoparticles have shown that nano-additives play an essential role in improving the performance of internal combustion engines and reducing the emission of harmful substances. This paper summarizes the recent research progress of nanoparticles as additives for diesel-biodiesel fuel blends. Firstly, the excellent properties of nanoparticles are described in detail, and the preparation methods are summarized and discussed. Secondly, the effects of several commonly used nanoparticles as diesel-biodiesel fuel blends on combustion performance and harmful substances emissions in terms of combustion thermal efficiency, brake specific fuel consumption, CO, UHC and NOx, are reviewed. Finally, the effects of nano-additives on internal combustion engines, the environment and human health are discussed. The work carried out in this paper can effectively contribute to the application of nanomaterials in the fuel field. Based on our work, the researchers can efficiently select suitable nano-additives that enable internal combustion engines to achieve efficient combustion and low-emission characteristics.

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Wang, Chao Hui, Zhuan Fang Zhang, You Wang, Xiao Hua Gu e Sheng Xiao Li. "Research on Wear Performance of Nano-Additives Cr-Mo-Cu Alloy Cast Iron". Advanced Materials Research 580 (outubro de 2012): 485–88. http://dx.doi.org/10.4028/www.scientific.net/amr.580.485.

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In this paper Cr-Mo-Cu alloy cast irons were prepared by adding nano-additives. The finite element of ANSYS was used to simulate the change of the stress field and strain field of Cr-Mo-Cu alloy cast iron with nano-additives under wear abrasion. The changes of shear stress and strain are also discussed in this paper.

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Barrick, Andrew, Olivier Champeau, Amélie Chatel, Nicolas Manier, Grant Northcott e Louis A. Tremblay. "Plastic additives: challenges in ecotox hazard assessment". PeerJ 9 (16 de abril de 2021): e11300. http://dx.doi.org/10.7717/peerj.11300.

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The risk of plastic debris, and specifically micro(nano)plastic particles, to ecosystems remains to be fully characterized. One particular issue that warrants further characterization is the hazards associated with chemical additives within micro(nano)plastic as they are not chemically bound within the polymers and can be persistent and biologically active. Most plastics contain additives and are therefore potential vectors for the introduction of these chemicals into the environment as they leach from plastic, a process that can be accelerated through degradation and weathering processes. There are knowledge gaps on the ecotoxicological effects of plastic additives and how they are released from parent plastic materials as they progressively fragment from the meso to micro and nano scale. This review summarizes the current state of knowledge of the ecotoxicity of plastic additives and identifies research needs to characterize the hazard they present to exposed biota. The potential ecological risk of chemical additives is of international concern so key differences in governance between the European Union and New Zealand to appropriately characterize their risk are highlighted.

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Guo, Junde, Yingxiang Zhao, Biao Sun, Puchao Wang, Zhijie Wang e Hao Dong. "Research Progress of Nano Copper Lubricant Additives on Engineering Tribology". Metals 11, n.º 12 (12 de dezembro de 2021): 2006. http://dx.doi.org/10.3390/met11122006.

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Nanoparticles have as characteristics super sliding, extreme pressure, self-healing, etc., which can improve the friction reduction and anti-wear performance of sliding components, when used as lubricating oil additives. Nano-copper particles have a good synergistic effect with other antifriction agents, anti-wear agents, antioxidants and grease additives because of their low shear strength and grain boundary slip effect, showing a better anti-friction and anti-wear effect. However, nanoparticles are prone to conglomerate, and this causes a bottleneck in the application of dispersant for nano-copper in a lubricating oil system. The regulation of nanosized effect and surface properties has great engineering significance in compensating for the precision in manufacturing accuracy. This paper comprehensively reviews the tribological research progress of nano-copper as a lubricant additive, which provides a reference to the application of nano-copper particles as lubricating oil additives on engineering tribology.

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Zvereva, E. R., R. V. Khabibullina e O. S. Zueva. "Nano Additives Influence on Fuel Oil Properties". Solid State Phenomena 265 (setembro de 2017): 374–78. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.374.

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The experimental investigations of the dynamic viscosity of the M100 brand heavy fuel oil with addition of nanostructured additives at temperatures of 65 °C and 75 °C have been presented. The study of the dynamic viscosity conducted for M100 fuel oil sample with the addition of a suspension of carbon nanotubes dispersed in diproksamin (concentration of 0.0125 wt.% CNT + 0.5 wt.% diproksamin) showed its decrease in almost the entire range of shear rates. The reduction in viscosity was observed even at low shear rates, which indicates the absence of extensive spatial structure in the oil heterogeneous system. Thus, the additive based on carbon nanotubes dispersed in diproksamin, improves the rheological properties of oil, reducing its viscosity to 12-15%. Therefore the energy consumption for fuel oil heating and pumping through pipelines can be reduced.

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Shi, Jianzhang, Quanxi Cao, Yunge Wei e Yunxia Huang. "ZnO varistor manufactured by composite nano-additives". Materials Science and Engineering: B 99, n.º 1-3 (maio de 2003): 344–47. http://dx.doi.org/10.1016/s0921-5107(02)00492-0.

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Julkapli, Nurhidayatullaili Muhd, e Samira Bagheri. "Developments in nano-additives for paper industry". Journal of Wood Science 62, n.º 2 (14 de dezembro de 2015): 117–30. http://dx.doi.org/10.1007/s10086-015-1532-5.

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Shcherban’, Evgenii M., Sergey A. Stel’makh, Alexey Beskopylny, Levon R. Mailyan, Besarion Meskhi e Valery Varavka. "Nanomodification of Lightweight Fiber Reinforced Concrete with Micro Silica and Its Influence on the Constructive Quality Coefficient". Materials 14, n.º 23 (30 de novembro de 2021): 7347. http://dx.doi.org/10.3390/ma14237347.

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A hypothesis was put forward that a nano-modifying additive of micro silica, which had a beneficial effect on achieving a perfect structure of heavy concrete, can also be effectively used in lightweight fiber-reinforced concrete. The nano-modifying additives of micro silica application in manufacturing lightweight fiber reinforced concrete products and structures can significantly enchain their strength characteristics without increasing their mass and consequently improve their design characteristics. The purpose of the work was to increase the structural quality coefficients for all types of strengths of lightweight fiber-reinforced concrete due to its modification with micro silica. The effect of nano-modifying additives of micro silica on the strength characteristics of lightweight fiber reinforced concrete was studied. The optimal amount of micro silica addition was experimentally confirmed and established of 10% of the cement mass. The coefficients of constructive quality for all experimentally determined strength characteristics of lightweight fiber-reinforced concrete modified with micro silica additives were calculated. The coefficient of constructive quality for tensile strength in bending of lightweight fiber reinforced concrete with additives was two and a half times higher than that of heavy concrete without additives and up to 37% higher than that of lightweight fiber-reinforced concrete without additives.

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Zhu, Hua Jing, Ze Li Chen e Ling Xu. "Optimization of the Preparation Process of Nano-Sized Calcium Carbonate with Low DOP Absorbency Applied in Plastic". Advanced Materials Research 569 (setembro de 2012): 136–43. http://dx.doi.org/10.4028/www.scientific.net/amr.569.136.

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This article filters sodium acetate as better additives by comparing the calcium carbonate obtained in the different dosage and adding manner for different additives. We discuss impact of four factors such as the amount of additives, the amount of dispersant, additive time of additives and initial temperature of carbonation on low DOP absorbency in the process of preparation of nano-sized calcium carbonate applied in plastic. And preparation conditions of this product which is to reduce DOP absorbency are studied. Nano-sized calcium carbonate with DOP absorbency of about in 40mL/100g (CaCO3 dry basis) applied in plastic is prepared. And the reparation conditions are the additive amount of 0.20% (CaCO3 dry basis), the amount of dispersant of 0.2% (CaCO3 dry basis), adding additives 5 min after the start carbonization and Carbonization temperature to 20°C.

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Hirani, Harish, Dharmender Jangra e Kishan Nath Sidh. "Experimental Investigation on the Wear Performance of Nano-Additives on Degraded Gear Lubricant". Lubricants 11, n.º 2 (30 de janeiro de 2023): 51. http://dx.doi.org/10.3390/lubricants11020051.

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This study investigates the degradation of a commercially available gear lubricant and the potential of nano-additives to mitigate such degradation. Initially, we performed an experimental study on the chemical degradation of commercially available API GL-4 EP90 gear lubricant by mixing the different concentrations of aqueous hydrochloric acid (aqueous HCl) varying from 0.0005% v/v up to 0.0025% v/v, while maintaining overall water content in the oil below the prescribed limits. The degradation was monitored using the pH value, total acid number (TAN) value, and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) analysis. The experiments were performed on a developed gear test rig using conventional gear oil as well as chemically aged gear oil, and the corresponding results of pH value and wear debris were recorded. Based on the results, an empirical regression model between the concentration of aqueous HCl and lubricant aging time has been established. Under chemically aged lubricant, severe wear of gear was observed, which motivated us to explore suitable nano-additive to minimize the gear wear. Initially, three nano-additives—graphite, graphene, and “graphene oxide functionalized with silicon oxide (GO@SiO2)”—were chosen. A series of tests were conducted using the design of experiments method (L8 and L16 orthogonal array) to investigate the effect of nano-additives and to find the optimum additive for wear performance. Finally, experiments were conducted on gear setup using the degraded lubricant optimized with nano-additive. Overall results indicate a very significant contribution of nano-additives in decreasing gear wear.

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Xu, Yi, He Long Yu, Bin Shi Xu, Xiao Li Wang e Qian Liu. "Preparation and Tribological Properties of Surface-Coated Nano-Copper Additives". Key Engineering Materials 373-374 (março de 2008): 580–84. http://dx.doi.org/10.4028/www.scientific.net/kem.373-374.580.

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In the present work, surface-coated Cu nanoparticles with FCC structure and an average size of 40 nm were prepared by reducing reaction and surface modification technique. The morphology and phase structure of the nano-copper were characterized by transmission electron microscope (TEM). The ball-on-disc tester and ring-on-block tester were performed to study the tribological properties of surface-coated Cu nanoparticles as oil additive. The tests were carried out under the lubrication of 50CC oil alone and oil containing surface-coated nano-copper additives. The morphologies and elementary distributions of the worn surfaces were analyzed by scanning electron microscope (SEM) and energy dispersive spectrometry (EDS), respectively. Results indicate that surface-coated nano-copper additives can significantly improve the wear resistance and load-carrying abilities of 50CC oil, as well as reduce friction coefficient. A soft copper protective film is formed on the worn surface lubricated with oil containing nano-copper additives, which separates the worn surfaces, avoids their direct contact and reduces friction and adhesive wear. Besides, the grooves and small valleys on the worn surfaces are found to be partly filled and repaired by nano-copper, as makes the worn surface repaired and smoother.

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Ma, Xiao Chun, Tao Li e Yu Ping Ni. "Effect of α-Al₂O₃ Nano-Additives on Properties of Anodic Oxide Films on AZ91D Magnesium Alloy". Advanced Materials Research 148-149 (outubro de 2010): 1003–6. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.1003.

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The effect of α-Al2O3 nano-additives on anodic oxide film-forming and film performance was studied. The morphology and phase compositions of the anodic oxide films were analyzed by scanning electronic microscope (SEM) and X-ray diffraction (XRD). The corrosion resistance of the anodic films with nano-Al2O3 was investigated by immersion test and potentiodynamic polarization technique. The results show that anodic oxide films mainly consists of Mg, Al12Mg17, γ-Al2O3, a little of Si and α-Al2O3. The corrosion resistance property of magnesium alloy can be improved with the addition of α-Al2O3 nano-additives.

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Thurairaj Rajeswari, Kannan, e Sheeju Selva Roji Selvadas. "Performance and emission characteristics of salviniaceae filiculoides aquatic fern oil and SiO₂ nano additive biodiesel in CI engine". Science and Technology for Energy Transition 78 (2023): 4. http://dx.doi.org/10.2516/stet/2022021.

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This present study deals the engine performance and emission of adding SiO2 nano additives in novel salviniaceae filiculoides aquatic fern biomass derived biodiesel. The primary aim of this present study was to investigate the effect of adding SiO2 nano additives into the Azolla Oil Methyl Ester (AZOME) as a sustainable biodiesel in the Compression Ignition (CI) engine and studying the engine performance and emission effects. The Azolla Oil Methyl Ester was prepared via transesterification process and blended with as-present diesel with various percentages. The SiO2 nano particles are mixed with AZOME using sonication. The test was conducted using a single cylinder Compression Ignition engine with different blends of AZOME biodiesel. The fuel was injected into the engine at different spill timings as 20°, 23°, and 26° Crank Angle (CA) before (b) Top Dead Centre (TDC). According to the results the break thermal efficiency of AZOME and its SiO2 blends were improved with spill timings. On compare with the conventional diesel the Injection Time (IT) of 23° b TDC and the average Brake Thermal Efficiency (BTE) of AZ20 fuel at the retarded spill timing of 20° was raised by 3.38%, while the AZ100 fuel at 20° b TDC is decreased by 0.9%. However the emission of AZ100 fuel found to be lesser due to the presence of SiO2 nano additives. Thus the addition of SiO2 nano additives along with aquatic biomass Azolla Oil Methyl Ester reduced the emission without affecting the engine performance.

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Yahayaa, Muhammad Sharil, Nurliyana Abdul Raof, Zulkifli Ibrahim, Azniza Ahmad e Chandima Gomes. "Modifications Required for Palm Oil to be Qualified as a Mechanical Lubricant". International Journal of Manufacturing, Materials, and Mechanical Engineering 9, n.º 1 (janeiro de 2019): 50–66. http://dx.doi.org/10.4018/ijmmme.2019010104.

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Adaptation of apt chemical modifications and incorporation of suitable additives, especially, nano-additives, could improve the properties of bio-lubricants derived from palm oil. This makes it one of the best alternatives to mineral oil lubricants. Possible chemical modifications are hydrogenation, esterification/ transesterification, epoxidation and metathesis. Feasible additives and nano-additives available in the market for minimizing the drawbacks of palm oil as a lubricant are ionic liquids, phosphorus, sulphur, zinc dialkyl dithiophosphate, metal, metal oxides, metal sulphides, carbonates, borates, carbon materials, organic materials, hexagonal boron nitride, alumina, CaO, CuO, ZnO, TiO2 and lanthanum borates. Few of them may not be environmental friendly. In line with market potentials and demand, it could be predicted that ROI of funding for the research and development of palm oil as a bio-lubricant may be significantly high. The study addresses tribological performance and properties, chemical modifications and formulation with additives of palm oil as a bio-lubricant.

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XU, W., Y. FU, W. YAN, Y. XU, M. XUE e J. XU. "TiO2 NANOPARTICLES DECORATED FLOWER-LIKE MoS2 NANOSPHERES WITH ENLARGED INTERLAYER SPACING OF (002) PLANE FOR ENHANCED TRIBOLOGICAL PROPERTIES". Digest Journal of Nanomaterials and Biostructures 16, n.º 1 (janeiro de 2021): 81–91. http://dx.doi.org/10.15251/djnb.2021.161.81.

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In this work, TiO2@MoS2 heterojunction of TiO2 nanoparticles decorated MoS2 nanospheres were successfully fabricated by one-step hydrothermal approach using TiO2 as the precursor, and systematically investigated by various characterization methods (e.g. XRD, SEM, TEM and XPS analysis). Moreover, the tribological experiments of liquid paraffin contained TiO2, MoS2, and TiO2@MoS2 nano-additives were comparatively investigated by a ball-plate wear instrument, which tribological variables include applied load and rotational speed. TiO2@MoS2 as an additive in base oil exhibited superior antifriction and wear resistant among various nano-additives. At the optimal conditions, 5%-TiO2@MoS2-paraffin samples show the lower friction coefficient (~0.08) compared with pure paraffin, and paraffin contained TiO2 and/or MoS2. Additionally, the excellent anti-friction and wear-resistant of TiO2@MoS2 in base oil would be beneficial for the design of novel MoS2-based nano-additives for improving tribological performance in the industry and agriculture.

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Zin, V., F. Agresti, S. Barison, L. Colla, E. Mercadelli, M. Fabrizio e C. Pagura. "Tribological Properties of Engine Oil with Carbon Nano-horns as Nano-additives". Tribology Letters 55, n.º 1 (10 de abril de 2014): 45–53. http://dx.doi.org/10.1007/s11249-014-0330-3.

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Song, Bao Yu, Qing Xiang Yang, Feng Zhang e Dai Zhong Su. "Rheological Properties of Aircraft Grease Containing Nano-Additives". Key Engineering Materials 419-420 (outubro de 2009): 53–56. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.53.

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The apparent viscosity of aircraft grease with different nano-particles content, temperature and shear rates were studied using a rotational viscometer. The rheological properties of two types of aircraft grease, the basic grease and the one with nano-particles additives, were investigated using a rheometer. The results indicated that the apparent viscosity increases with the increase of nanoparticle concentration with the given ratio of nano-particles added. It was also found that the grease with and without the nano-particles both have yield stresses and clear shear-thinning properties. The shear-thinning phenomenon of the grease containing nano-particles is more evident than that of the basic grease. The experimental results also reveal that the rheological characteristics of both types of grease fall in Herschel-Bulkley class, and the nano-particles have a significant influence on the rheological parameters. At the end, the rheology mechanism was discussed based on the entanglement and orientation theories.

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Karunarathne, Venura Kiloshana, Suvash Chandra Paul e Branko Šavija. "Development of Nano-SiO2 and Bentonite-Based Mortars for Corrosion Protection of Reinforcing Steel". Materials 12, n.º 16 (17 de agosto de 2019): 2622. http://dx.doi.org/10.3390/ma12162622.

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In this study, the use of nano-silica (nano-SiO2) and bentonite as mortar additives for combating reinforcement corrosion is reported. More specifically, these materials were used as additives in ordinary Portland cement (OPC)/fly ash blended mortars in different amounts. The effects of nano-silica and bentonite addition on compressive strength of mortars at different ages was tested. Accelerated corrosion testing was used to assess the corrosion resistance of reinforced mortar specimens containing different amounts of nano-silica and bentonite. It was found that the specimens containing nano-SiO2 not only had higher compressive strength, but also showed lower steel mass loss due to corrosion compared to reference specimens. However, this was accompanied by a small reduction in workability (for a constant water to binder ratio). Mortar mixtures with 4% of nano-silica were found to have optimal performance in terms of compressive strength and corrosion resistance. Control specimens (OPC/fly ash mortars without any additives) showed low early age strength and low corrosion resistance compared to specimens containing nano-SiO2 and bentonite. In addition, samples from selected mixtures were analyzed using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Finally, the influence of Ca/Si ratio of the calcium silicate hydrate (C-S-H) in different specimens on the compressive strength is discussed. In general, the study showed that the addition of nano-silica (and to a lesser extent bentonite) can result in higher strength and corrosion resistance compared to control specimens. Furthermore, the addition of nano-SiO2 can be used to offset the negative effect of fly ash on early age strength development.

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Yoon, Han Ki, Young Ju Lee, Yi Hyun Park, Joon Soo Park e Akira Kohyama. "Mechanical Properties and Fabrication of Silicon Carbide Ceramic by NITE Method". Solid State Phenomena 124-126 (junho de 2007): 699–702. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.699.

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Nano infiltration transient eutectic ceramic (NITE-SiC) was fabricated by hot pressing method using Al2O3 and Y2O3 as sintering additives. The ratio of the Al2O3/Y2O3 additives was changed between 6:4 and 4:6. The densification and mechanical properties were investigated for the sintered temperature. The starting powder was high purity β -SiC nano-powder with an average particle size of 30nm. The bending strength characterization and densification of NITE-SiC was investigated by the FE-SEM and three point bending test.

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Demirtas, Selman, Hakan Kaleli, Mahdi Khadem e Dae-Eun Kim. "Characterization of the friction and wear effects of graphene nanoparticles in oil on the ring/cylinder liner of internal combustion engine". Industrial Lubrication and Tribology 71, n.º 5 (8 de julho de 2019): 642–52. http://dx.doi.org/10.1108/ilt-05-2018-0170.

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Purpose This study aims to investigate the tribological characteristics of a Napier-type second piston ring against a cylinder liner in the presence of graphene nano-additives mixed into 5W40 fully synthetic engine oil. Design/methodology/approach Wear tests were carried out in the boundary lubrication condition using a reciprocating tribometer, and real engine tests were performed using a single spark ignition Honda GX 270 test engine for a duration of 75 h. Findings The experimental results of the tribometer tests revealed that the nano-additives formed a layer on the rubbed surfaces of both the piston ring and the cylinder liner. However, this layer was only formed at the top dead center of the cylinder liner during the engine tests. The accumulation of carbon (C) from the graphene was heavily detected on the rubbed surface of piston ring/cylinder liner, mixed with other additive elements such as Ca, Zn, S and P. Overall, the use of graphene nano-additives in engine oil was found to improve the frictional behavior in the boundary and mixed lubrication regimes. Abrasive wear was found to be the main mechanism occurring on the surface of both piston rings and cylinder liners. Originality/value Though many researchers have discussed the potential benefits of graphene as a nano-additive in oil to reduce the friction and wear in laboratory tests using tribometers, to date, no actual engine tests have been performed. In this paper, both tribometer and real engine tests were performed on a piston ring and cylinder liner using a fully formulated oil with and without graphene nano-additives in the boundary lubrication condition. It was found that a graphene nano-additive plays an active role in lowering the coefficient of friction and increasing surface protection and lubrication by forming a protective layer on the rubbing surfaces.

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Singh, Pankaj. "Use of Nano Feed Additives in Livestock Feeding". International Journal of Livestock Research 6, n.º 1 (2016): 1. http://dx.doi.org/10.5455/ijlr.20150816121040.

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Dixit, Kritika, Vikram Karde, Ashish Jauhari, S. C. Bhattacharyya e Chinmay Ghoroi. "Flow improvement of fine oxidizer using nano-additives". Advanced Powder Technology 33, n.º 8 (agosto de 2022): 103711. http://dx.doi.org/10.1016/j.apt.2022.103711.

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Karozou, Aspasia, Eleni Pavlidou e Maria Stefanidou. "Enhancing Properties of Clay Mortars Using Nano-Additives". Solid State Phenomena 286 (janeiro de 2019): 145–55. http://dx.doi.org/10.4028/www.scientific.net/ssp.286.145.

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Earthen materials have been used in construction for centuries. Nowadays, a certain appeal towards natural materials rose again due to the various benefits they hold. Besides being inexpensive and approachable, earthen construction offers a clear sustainable method of modern manufacturing. Since earthen materials present high absorption and relatively low compressive strength, the main purpose of this study was to enhance these abilities of clay-based mortars using nanoadditives. To achieve the mechanical and physical invigoration of the clay matrix two different compositions were fabricated by the use of nanoclay, nanosilica and nanoalumina. The addition of nanoclay (NC) at 5%w/w of binder, indicated a lower water absorption and an increase in mechanical properties, while the use of nanosilica and nanoalumina combined at 1.5% and 1% w/w of binder respectively, outline a less stable and compact structure.

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Xu, Zhen, e Junfeng Sun. "Anti-wear Mechanism Analysis of Nano-CaCO3 Additives". E3S Web of Conferences 38 (2018): 02018. http://dx.doi.org/10.1051/e3sconf/20183802018.

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In this paper, the wear test was carried on with cylinder piston by the wear test device, receiving the results of the piston ring wear and abrasive characteristics by monitoring the wear process, the thesis analysis and put forward the nano-CaCO3 lubricating oil additive anti wear mechanism by the ferrography analysis technology, and provide the technical reference for the relevant measures to reduce wear and the friction, and provide reference value for further study on the related theories of reducing wear and reducing friction.

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Penkova, A. V., S. F. Acquah, L. B. Piotrovskiy, D. A. Markelov, A. S. Semisalova e H. W. Kroto. "Fullerene derivatives as nano-additives in polymer composites". Russian Chemical Reviews 86, n.º 6 (29 de junho de 2017): 530–66. http://dx.doi.org/10.1070/rcr4712.

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Liu, Chang, Khalid Lafdi e Francisco Chinesta. "Durability sensor using low concentration carbon nano additives". Composites Science and Technology 195 (julho de 2020): 108200. http://dx.doi.org/10.1016/j.compscitech.2020.108200.

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Mahmood, D., N. AL-Zubaidi e A. Alwasiti. "Improving Drilling Fluid Properties by Using Nano-Additives". Engineering and Technology Journal 35, n.º 10 (1 de outubro de 2017): 1034–41. http://dx.doi.org/10.30684/etj.35.10a.10.

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Kuti, Rajmund, Ádám István Szabó e Álmos Dávid Tóth. "Experimental Investigation of Tribological Properties of Two Fully Formulated Engine Oils with Additional Nanoscale Spherical Zirconia Particles". Lubricants 10, n.º 10 (30 de setembro de 2022): 246. http://dx.doi.org/10.3390/lubricants10100246.

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Decreasing harmful emissions of vehicle engines is becoming more and more challenging due to stricter standards. A possible solution is to improve the tribological attributes of lubricants, which can be achieved through the application of appropriate additives. According to preliminary studies conducted by the authors, ZrO2 (zirconium-dioxide) nano-sized ceramic particles as lubricant additives have overwhelmingly positive tribological attributes in the presence of non-metallic superficial materials. Additive concentration, as well as cross-effects with other additives were investigated in order to determine a formulation resulting in optimal tribological attributes. In this paper, the experimental investigation of ZrO2 nano-ceramic powder as a lubricant additive is presented. The tribological performance of individually samples were experimentally investigated on a ball-on-disc translational tribometer. The experiments revealed an optimal additive content of 0.3 wt%. Increasing the quantity of additives further ruined friction and wear properties of the examined tribological system.

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Rahman, Md Hafizur, Haley Warneke, Haley Webbert, Joaquin Rodriguez, Ethan Austin, Keli Tokunaga, Dipen Kumar Rajak e Pradeep L. Menezes. "Water-Based Lubricants: Development, Properties, and Performances". Lubricants 9, n.º 8 (23 de julho de 2021): 73. http://dx.doi.org/10.3390/lubricants9080073.

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Water-based lubricants (WBLs) have been at the forefront of recent research, due to the abundant availability of water at a low cost. However, in metallic tribo-systems, WBLs often exhibit poor performance compared to petroleum-based lubricants. Research and development indicate that nano-additives improve the lubrication performance of water. Some of these additives could be categorized as solid nanoparticles, ionic liquids, and bio-based oils. These additives improve the tribological properties and help to reduce friction, wear, and corrosion. This review explored different water-based lubricant additives and summarized their properties and performances. Viscosity, density, wettability, and solubility are discussed to determine the viability of using water-based nano-lubricants compared to petroleum-based lubricants for reducing friction and wear in machining. Water-based liquid lubricants also have environmental benefits over petroleum-based lubricants. Further research is needed to understand and optimize water-based lubrication for tribological systems completely.

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Mirza, Muhammad Mumtaz, Elansezhian Rasu e Anjali Desilva. "Influence of Nano Additives on Protective Coatings for Oil Pipe Lines of Oman". International Journal of Chemical Engineering and Applications 7, n.º 4 (agosto de 2016): 221–25. http://dx.doi.org/10.18178/ijcea.2016.7.4.577.

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Khan, Zakir, e Zulfiqar Ahmad Khan. "Performance Evaluation of Coupled Thermal Enhancement through Novel Wire-Wound Fins Design and Graphene Nano-Platelets in Shell-and-Tube Latent Heat Storage System". Energies 14, n.º 13 (22 de junho de 2021): 3743. http://dx.doi.org/10.3390/en14133743.

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Technological development in latent heat storage (LHS) systems is essential for energy security and energy management for both renewable and non-renewable sources. In this article, numerical analyses on a shell-and-tube-based LHS system with coupled thermal enhancement through extended fins and nano-additives are conducted to propose optimal combinations for guaranteed higher discharging rate, enthalpy capacity and thermal distribution. Transient numerical simulations of fourteen scenarios with varied combinations are investigated in three-dimensional computational models. The shell-and-tube includes paraffin as phase change material (PCM), longitudinal, radial and wire-wound fins and graphene nano-platelets (GNP) as extended fins and nano-additives, respectively. The extended fins have demonstrated better effectiveness than nano-additives. For instance, the discharging durations for paraffin with longitudinal, radial and wire-wound fins are shortened by 88.76%, 95.13% and 96.44% as compared to 39.33% for paraffin with 2.5% GNP. The combined strengths of extended fins and nano-additives have indicated further enhancement in neutralising the insulative resistance and stratification of paraffin. However, the increase in volume fraction from 1% to 3% and 5% is rather detrimental to the total enthalpy capacity. Hence, the novel designed wire-wound fins with both base paraffin and paraffin with 1% GNP are proposed as optimal candidates owing to their significantly higher heat transfer potentials. The proposed novel designed configuration can retrieve 11.15 MJ of thermal enthalpy in 1.08 h as compared to 44.5 h for paraffin in a conventional shell-and-tube without fins. In addition, the proposed novel designed LHS systems have prolonged service life with zero maintenance and flexible scalability to meet both medium and large-scale energy storage demands.

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Munteanu, Silvestru Bogdănel, e Cornelia Vasile. "Vegetable Additives in Food Packaging Polymeric Materials". Polymers 12, n.º 1 (22 de dezembro de 2019): 28. http://dx.doi.org/10.3390/polym12010028.

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Plants are the most abundant bioresources, providing valuable materials that can be used as additives in polymeric materials, such as lignocellulosic fibers, nano-cellulose, or lignin, as well as plant extracts containing bioactive phenolic and flavonoid compounds used in the healthcare, pharmaceutical, cosmetic, and nutraceutical industries. The incorporation of additives into polymeric materials improves their properties to make them suitable for multiple applications. Efforts are made to incorporate into the raw polymers various natural biobased and biodegradable additives with a low environmental fingerprint, such as by-products, biomass, plant extracts, etc. In this review we will illustrate in the first part recent examples of lignocellulosic materials, lignin, and nano-cellulose as reinforcements or fillers in various polymer matrices and in the second part various applications of plant extracts as active ingredients in food packaging materials based on polysaccharide matrices (chitosan/starch/alginate).

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Dey, Sudatta, Asmita Samadder e Sisir Nandi. "Exploring Current Role of Nanotechnology Used in Food Processing Industry to Control Food Additives and their Biochemical Mechanisms". Current Drug Targets 23, n.º 5 (abril de 2022): 513–39. http://dx.doi.org/10.2174/1389450123666211216150355.

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Background: With the advent of food additives centuries ago, the human race has found ways to improve and maintain the safety of utility, augment the taste, color, texture, nutritional value, and appearance of the food. Since the 19th century, when the science behind food spoilage was discerned, food additives in food preservation have been increasing worldwide and at a fast pace to get along with modern lifestyles. Although food additives are thought to be used to benefit the food market, some of them are found to be associated with several health issues at an alarming rate. Studies are still going on regarding the mechanisms by which food additives affect public health. Therefore, an attempt has been made to find out the remedies by exploiting technologies that may convey new properties of food additives that can only enhance the quality of food without having any systemic side effects. Thus, this review focuses on the applications of nanotechnology in the production of nano-food additives and evaluates its success regarding reduction in the health-related hazards by collaterally maintaining the food nutrient value. Methodology: A thorough literature study was performed using scientific databases, like PubMed, Science Direct, Scopus, and Web of Science, for determining the design of the study, and each article was checked for citation and referred to formulate the present review article. Conclusion: Nanotechnology can be applied in the food processing industry to control the unregulated use of food additives and intervene in the biochemical mechanisms at a cellular and physiological level for ensuring the safety of food products. The prospective of nano-additive of chemical origin could be useful to reduce risks of hazards related to human health that are caused majorly due to the invasion of food contaminants (either intentional or non-intentional) into food, though this area still needs scientific validation. Therefore, this review provides comprehensive knowledge on different facets of food contaminants and also serves as a platform of ideas for encountering health risk problems about the design of improved versions of nano-additives.

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Shi, Shih-Chen, Tao-Hsing Chen e Pramod Kumar Mandal. "Enhancing the Mechanical and Tribological Properties of Cellulose Nanocomposites with Aluminum Nanoadditives". Polymers 12, n.º 6 (29 de maio de 2020): 1246. http://dx.doi.org/10.3390/polym12061246.

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Hydroxypropyl methylcellulose (HPMC) is a common hydrophilic and biodegradable polymer that can form films. This study incorporated aluminum nanoadditives as an enhancement reagent into a HPMC matrix. Mechanical properties of nanocompoistes, including the tensile strength and the elastic modulus, were analyzed with a nano-tensile tester. The incorporation of additives in HPMC films significantly enhances their mechanical and film barrier properties. Evidence of bonding between the additive and matrix was observed by Fourier-transform infrared spectrometer analysis. The additives occupy the spaces in the pores of the matrix, which increases the tendency of the pore to collapse and improves the chemical bonding between the base material and the additives. The incorporation of excess additives decreases the tensile strength due to ineffective collisions between the additives and the matrix. The wear test proves that the addition of nano-additives can improve the tribology performance of the HPMC composite while reducing the wear volume and the friction. Bonding between the nanoadditives and the matrix does not help release the nanoadditives into the wear interface as a third-body layer. The main reason to enhance the tribology performance is that the nanoadditives improve the load-capacity of the composite coating. This hybrid composite can be useful in many sustainability applications.

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