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Artykuły w czasopismach na temat "Ordered Nano-composite"
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Li Yan, Wang Cheng-Wei, Tian Jun, Liu Wei-Min, Chen Miao i Li Hu-Lin. "Optical properties of ordered Co/AAO nano-array composite structure". Acta Physica Sinica 53, nr 5 (2004): 1594. http://dx.doi.org/10.7498/aps.53.1594.
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Guo Cai, Xu, DAI Ming Hu, JI Xiao Li, Zhang Xiao Mei i Xing Hong Long. "Preparation and Ordered Self-Assembly of Nano-Pd-Ga/PMMA by Ultrasonic". Journal of Nanomaterials 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/368152.
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Nano-Ga-Pd/poly methyl methacrylate (PMMA) composite materials were prepared with the palladium chloride solution containing metal gallium, MMA as monomer, and sodium dodecyl sulfate (SDS) as emulsifier without initiatoror reducer. Pd, Ga, andGa5Pdphase in PMMA matrix were identified by XRD. The characteristic absorption peak at 200 nm for nano-Ga/PMMA polymer solution, at 209 nm for nano-Pd/PMMA polymer solution were proved by UV-Vis; the binding energy changes of O1s, Ga2p3, Ga2d, and Pd3d were characterized by means of X-ray photoelectron spectroscopy. It is concluded that nano-Ga5Pdwas produced based on segment electronics shifting from Gallium to Palladium, and coordination was formed on segment electronics from Gallium to oxygen of PMMA ester group. The anisotropism ordered assembly of PMMA around nano-Ga-Pd particles were illuminated by transmission electron microscopy; it is further interpreted that nano Ga-Pd particles had ordered-assembly induced effect.
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Khan, Sourav, Rayappan Pavul Raj, Talla Venkata Rama Mohan i Parasuraman Selvam. "Electrochemical performance of nano-sized LiFePO4-embedded 3D-cubic ordered mesoporous carbon and nitrogenous carbon composites". RSC Advances 10, nr 51 (2020): 30406–14. http://dx.doi.org/10.1039/d0ra04754f.
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Nano-sized LiFePO4-embedded nitrogenous ordered mesoporous carbon composite cathode facilitate electronic conductivity and significantly enhances Li-ion diffusion and retains 97% of the initial discharge capacity at 1C rate even after 100 cycles.
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Wang, Hui, Dan Dai, Xin Zhang i Xue Dong Wu. "Preparation and Characterization of TiO2 Nanowires on Aluminum Substrate". Materials Science Forum 610-613 (styczeń 2009): 288–92. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.288.
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Combined with sol-gel method, ultrasonic impregnation approach was employed to prepare TiO2/ Al2O3 surface composite on aluminum. The results showed that with the effect of ultrasonic, the TiO2 colloid fabricated by sol-gel method can enter the inner of the ordered AAO film to form anatase TiO2 nano wires after being heated at 500°C for 2h. The diameters and lengths of TiO2 nano wires were controlled by the diameter and thickness of AAO film. Close to the bottom of aluminum substrate, the TiO2 nano wires became nano pipes, plates and particles.
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Chujo, Yoshiki, i Ryo Tamaki. "New Preparation Methods for Organic–Inorganic Polymer Hybrids". MRS Bulletin 26, nr 5 (maj 2001): 389–92. http://dx.doi.org/10.1557/mrs2001.92.
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Nano-ordered composite materials consisting of organic polymers and inorganic compounds have been attracting attention for their use in creating high-performance or high-functionality polymeric materials. The term “polymer hybrid” describes blends of organic and inorganic components with molecular-level dispersions.
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Lin, Song Zhu, Feng Gao i Ruo Kun Jia. "Preparation of Conductive Response Polyaniline/Polyurethane Orderde Array Thin Film". Advanced Materials Research 608-609 (grudzień 2012): 1359–62. http://dx.doi.org/10.4028/www.scientific.net/amr.608-609.1359.
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Polyaniline nano particles and polyaniline/polyurethane composite film were prepared through the template-free method. The ordered array structure of composite thin films with optical property were observed. The proportion of polyaniline/polyurethane in the composite films was discussed, and the change of resistance and absorbance of the thin films was measured in different proportion. In the energized condition polyaniline/polyurethane composite film had morphological changes, shrink trend, and their resistance value became significantly increasing. With the increase of the voltage electricity, the film contraction trend changed bigger.
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He, Yunfei, Yanan Liu, Xu Yan, Guangyu Qin, Yuhao Liu, Bo Zhong, Long Xia, Dongdong Liu, Yu Zhou i Xiaoxiao Huang. "Mesoscopically ordered Fe3O4/C nano-composite for superior broadband electromagnetic wave absorption". Composites Part A: Applied Science and Manufacturing 158 (lipiec 2022): 106983. http://dx.doi.org/10.1016/j.compositesa.2022.106983.
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Wang Jian, Wang Cheng-Wei, Li Yan, Liu Wei-Min i Shigeaki Zaima. "Determination of optical parameters of ordered Ag/AAO nano-array composite structure". Acta Physica Sinica 54, nr 12 (2005): 5920. http://dx.doi.org/10.7498/aps.54.5920.
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Bian, Tierong, Heng Zhang i Hongyun Xing. "Preparation and biological properties of collagen/nano-hydroxyapatite composite nanofibers based on ordered nano-hydroxyapatite ceramic fibers". Colloids and Surfaces A: Physicochemical and Engineering Aspects 602 (październik 2020): 124802. http://dx.doi.org/10.1016/j.colsurfa.2020.124802.
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Sumitomo, Taro, Hideki Kakisawa, Yusuke Owaki i Yutaka Kagawa. "Structure of Natural Nano-Laminar Composites: TEM Observation of Nacre". Materials Science Forum 561-565 (październik 2007): 713–16. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.713.
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Nacre is a natural composite material making up the inner structure of mollusk shells. It has been of great interest in materials research due to its mechanical properties far exceeding that of its individual components: well ordered plates of aragonite (a CaCO3 polymorph) within an organic polymer matrix. Generally the aragonite plates had been treated as single crystals and mechanical behavior explained as the result of micro-scale mechanisms between plates and matrix. However, recent work has shown that the plates themselves are made up of smaller nano-scale structures, which are also thought to contribute to the bulk properties. In this work, transmission electron microscopy (TEM) was used to observe the nano-scale structure of nacre from abalone. “Nanograins” of aragonite surrounded by organic material was observed, showing composite structure within aragonite plates.
Rozprawy doktorskie na temat "Ordered Nano-composite"
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Yadav, Arti. "Nano Porous Alumina Based Composite Coating for Tribological Applications". Thesis, 2014. http://hdl.handle.net/2005/3055.
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Anodisation is a surface treatment process, commonly used to form a protective oxide coating on the surface of metals like aluminium. Anodised coatings, being grown out of the base metal have excellent interface strength but are porous and brittle. Porosity of the coating reduces the hardness and the brittle nature of the oxide induces cracking. In practice, the pores are typically filled with organic dye and sealed. Under certain controlled electrochemical conditions, anodisation results in a highly ordered hexagonal porous structure in pure aluminium. In this work, we explore the possibility of using this ordered porous alumina to form a novel metal nanocomposite as a tribological coating. By optimizing the nonporous structure and tuning the electrodeposition process, we uniformly filled the ordered pores with copper. We have measured the hardness of the resulting ordered and aligned nanocomposite. We explore the possibility of using this composite coating for tribological applications by carrying out some preliminary reciprocating wear test.
Ordered porous alumina layer is formed by a two-step anodisation process. By optimizing the anodisation conditions, we control the thickness of the coating and the pore size. The interface of the porous structure and aluminium substrate is defined by a non-conducting dense barrier oxide layer. However, to deposit metal into the pores, a conducting path should be established through the barrier layer. One possibility is to etch out the bottom of the pores at the cost of the interface strength and losing out on the main advantage of anodised coatings. To be able to fill metal without this sacrifice, we utilised the dendritic structure in the barrier layer formed by a step-wise reduction of voltage towards the end of anodisation process. Optimisation of this dendritic structure led to uniform deposition of metal into pores, achieved by pulsed electrodeposition. In pulse lectrodeposition, a positive pulse is applied to remove accumulated charge near to the bottom of pores, followed by a negative pulse to deposit metal and a delay to allow diffusion of ions. By optimising the pulse shape and duration, we have achieved uniform growth of metal into pores. Further, monitoring the deposition current helped us to identify and control different phases of growth of the nanowire.
The properties of the porous alumina and the nanocomposite were measured by nanoindentation. The deformation characteristics were obtained by observing the indents in a FE-SEM. We find that dendritic modification of interface has very little effect on the hardness of the porous alumina layer. We also found that the porous alumina deformed either by compaction or by forming circumferential and radial cracks. When copper is filled in the nano pores, the hardness increased by 50% and no circumferential cracks were found up to the load of 10 mN for a film thickness of about 1 µm. Coefficient of friction of the coating reciprocated against steel in dry condition is found to be around 0.4. Minimal wear was observed from the SEM images of wear track.
In summary, a novel nanocomposite coating with ordered porous alumina as matrix embedded with aligned metal nano rods has been developed. This was achieved by optimally modifying the barrier layer without sacrificing the interfacial strength. Uniform coating has been achieved over an area of 10 mm x 10 mm. The coating is found to have high hardness and high wear resistance.
Części książek na temat "Ordered Nano-composite"
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Shan, Jingsong, Chengfa Song, Shengbo Zhou, TongJun Duan, Shuai Zheng i Bo Zhang. "Study on Performance of Pervious Concrete Modified by Nano-Silicon + Polypropylene Fiber Composite". W Lecture Notes in Civil Engineering, 189–98. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_15.
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AbstractIn order to improve the comprehensive performance of pervious concrete, nano-silicon and polypropylene fiber were added to pervious concrete to study the change of performance of pervious concrete. Firstly, the effect of single doped nano-silicon on the properties of cement slurry and pervious concrete was studied, and the optimal water-binder ratio and nano-silicon content were determined. Based on this, mixed polypropylene fiber with different proportions of length of 18 mm to determine the reasonable amount of polypropylene fiber. The results showed that the compressive strength of pervious concrete was the highest when the nano-silicon content was 0.5% and the water-binder ratio was 0.32. Based on this ratio, the maximum compressive strength can be obtained by adding 1.0 kg/m3 polypropylene fiber, and the compressive strength of 7d and 28d increased by 29.9% and 42.2%, respectively. Adding 1.5 kg/m3 polypropylene fiber was the most beneficial to improve the freezing resistance of pervious concrete. For example, after 300 freeze–thaw cycles, the compressive strength residual rate was 62%. That's much higher than the 40 percent that was found when nano silicon was mixed alone.
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Panda, Maheswar. "Ferroelectric, Piezoelectric and Dielectric Properties of Novel Polymer Nanocomposites". W Multifunctional Ferroelectric Materials. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96593.
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In this chapter, the Ferroelectric, Piezoelectric and Dielectric behavior of novel polymer/ceramic nano-composite (PCC) based on ferroelectric polymer [polyvinyledene fluoride (PVDF)] & nano Barium Titanate (n-BaTiO3) with different volume fractions of n-BaTiO3 (fBaTiO3), prepared through the novel cold pressing method has been discussed. The ferroelectric parameters of PCC are attributed to spherulites of PVDF, the increase of n-BaTiO3 and the ordered homogenous structure due to the novel cold pressing. The clustering of ceramic fillers is responsible for randomization of the structures of these composite ferroelectrics for some samples, leading to decrease of electrical polarisations. The piezoelectricity and piezoelectric coefficients of these composites ferroelectrics, increases with increase of ceramic filer content and remains constant beyond a certain ratio. However, the dielectric properties increase linearly as a function of ceramic content due to increase of interfaces/interfacial polarisations. The enhancement of effective dielectric constant (ɛeff) is attributed to the large interfacial polarization arising due to the charge storage at the spherulites of PVDF and at the polymer/filler interfaces of PCC and have been explained on the basis of sum effect with the help of the standard models. The achieved lower loss tangent (Tan δ) for the PCC as compared to the polymer/metal composites (PMC) is attributed to the highly insulating nature of PVDF & semiconducting n-BaTiO3. The thermal stability of the composites is also maintained due to the higher melting temperature (170°C) of PVDF. The cold pressed PCC based on PVDF are going to act as better polymer ferroelectric/dielectrics for memory and electrical energy storage applications.
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Naik, Charanaraja, Prasanta Kumar Samal, B. Hulugappa, B. Suresha, Imran M. Jamadar i Pramod Kumar Malik. "Effect of Filler Material Type on Dynamic Behaviour of Composite Beams; an Experimental Study". W Intelligent Technologies for Scientific Research and Engineering, 147–54. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815079395123010017.
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The composite materials find various applications such as in turbine blades, helicopter blades, airplane wings, medical instruments, sports equipment, etc. They are subjected to a variety of dynamic excitations. The resonance condition is desirable for some applications such as vibration actuators, and musical instruments. And due to resonance, catastrophic failure may occur for most of the applications. Therefore, a study of dynamic behavior plays an important role in the design of materials either to avoid or to enforce resonance conditions. This work aims at the experimental investigation of vibration characteristics of composite beams. In this work, composite beams were made of glass fiber and epoxy resin with varying filler materials and their percentage. Three filler materials, viz. Calcium Carbonate (CaCO3), Nano-Clay, and Silicon Carbide (SiC) were considered for the study. The National Instruments Data Acquisition system (NI-DAQ) with a triaxial accelerometer was used to acquire the vibration data. The natural frequencies of the beams were determined from the frequency domain data and damping ratios of the beams were determined from time-domain data. Effects of filler material type on natural frequencies and damping ratios were studied. According to the research, the damping ratio values drop in the order of CaCO3, Nano-Clay, and SiC while the natural frequency values decrease in the order of Nano-Clay, CaCO3, and SiC.
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Majeed Ahmed, Luma. "Bulk and Nanocatalysts Applications in Advanced Oxidation Processes". W Oxidoreductase [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94234.
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Advanced oxidation processes (AOPs) are considered to be vital methods for treating the contaminations produced mainly by the human activations. In present-day, UV light or solar light, bulk and nano- photocatalysts are often used to enhance this technology by creating the highly reactive species such as the hydroxyl radicals. Extreme hydroxyl radical is considered as a key to start the photoreaction. Photoreaction is widely used in treatment of Lab and industrial contaminations, preparation of compounds and produced the renewable energy, so it’s classified as green technique. In order to improve the efficiency of this reaction with fabrication the surface of the used photocatalyst such as metal doped, sensitized and produced a composite as bulk catalyst or nano catalyst.
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Bolka, Silvester, i Blaž Nardin. "Reactive Extrusion as an Environmentally Friendly Technology for the Production of Bio(Nano)Composites: Implementation and Characterization". W Biocomposites - Recent Advances [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108572.
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The influences of reactive extrusion of poly(lactic acid) (PLA)-based bio(nano)composites on their properties are described. Reactive compatibilizers were used to enable good dispersion of natural (nano)fibers in the thermoplastic matrix consisting of PLA/poly(butylene adipate-co-terephthalate) (PBAT) and PLA/polycarbonate (PC) blends. At the same time, chain extenders were used for the modification of immiscible thermoplastics, PLA and PBAT, in order to achieve good miscibility of the PLA/PBAT blend. In the experimental part, the main obstacle of PLA, its brittleness, was improved in three different series of bio(nano)composites. Reactive extrusion with PLA/PBAT blends and the addition of hops as a chain extender and compatibilizer increased the elongation at break of the bio(nano)composite by more than 240% and the impact strength by 200% compared to neat PLA. Reactive extrusion of PLA/PBAT blends and addition of 1% nanocrystalline cellulose (NCC) with additives increased the elongation at break by more than 730% compared to pure PLA, and the sample did not break during the impact testing. Reactive extrusion with PLA/PC blends and the addition of 1 wt% NCC with additives increased the elongation at break by more than 90% and the impact strength by more than 160% compared to pure PLA.
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Li, Jianliang, Dangsheng Xiong, Yongkun Qin i Rajnesh Tyagi. "Tribological Behavior of Ni-Based Self-Lubricating Composites at Elevated Temperatures". W Processing Techniques and Tribological Behavior of Composite Materials, 72–106. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-7530-8.ch003.
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This chapter illustrates the effect of the addition of solid lubricants on the high temperature friction and wear behavior of Ni-based composites. Ni-based composites containing solid lubricant particles both in nano and micrometer range have been fabricated through powder metallurgy route. In order to explore the possible synergetic action of a combination of low and high temperature solid lubricant, nano or micro powders of two or more solid lubricants were added in the composites. This chapter introduces the fabrication of the Ni-based self-lubricating composites containing graphite and/or MoS2, Ag and/or rare earth, Ag and/or hBN as solid lubricants and their friction and wear behavior at room and elevated temperatures. The chapter also includes information on some lubricating composite coatings such as electro-deposited nickel-base coating containing graphite, MoS2, or BN and graphene and their tribological characteristics.
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Lakhane, Madhuri, i Megha Mahabole. "Biocompatible Composites and Applications". W Bio-Inspired Nanotechnology, 16–40. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815080179123010004.
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In this chapter, the low-cost, biodegradable absorbents are developed for wastewater treatment. At first, the modification of the procured nano ZSM-5 is executed by means of dealumination and ion exchange process to have de-laminated (D-ZSM-5), Cu-ZSM-5 and Fe-ZSM-5. Furthermore, cellulose nanofibrils (CNFs) are mixed with modified zeolites with varying concentrations (20 and 80 wt%) used for the fabrication of innovative composite films ((D-ZSM-5, Cu-ZSM-5 and Fe-ZSM-5). FTIR, XRD, BETCO2, TGA, and SEM type of characterization techniques are used for the analysis of composites. The prepared composite films are exploited for cationic Rhodamine B (Rh6B) and anionic Reactive Blue 4 (RB4) dye elimination by the activity of adsorption. The effect of contact time, initial dye concentration and pH on the dyes’ adsorption in aqueous buffer solutions is examined. The equilibrium adsorption data are estimated using Langmuir, Freundlich, and Temkin isotherm models. Langmuir isotherm is deemed to be the best-fitting model and the process (kinetics and mechanism) follows pseudo-second-order kinetics, yielding an uppermost adsorption capacity of 34 mg/g, and 16.55 mg/g which is comparable to plane CNF (8.7mg/g) and (0.243mg/g) for cationic Rh6B dye and anionic RB4 dye respectively. Maximum dye removal is observed for a higher amount of (80% ZSM-5) film. The study reveals that ZSM-5/ CNFs films can potentially be used for the removal of cationic and anionic dyes.
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Banerjee, Avijit, i Timothy F. Watson. "Restorative materials and their relationship to tooth structure". W Pickard's Guide to Minimally Invasive Operative Dentistry. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780198712091.003.0010.
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Modern restorative materials can be classified in several ways, in terms of their retention (chemically adhesive, macro-, micro- or even nanomechanical), their chemistry (e.g. resin-based vs. acid–base reaction, filler particles), or their clinical properties (e.g. aesthetics, strength, handling). It is essential that these materials are considered closely with the histological substrate to which they will adhere or with which they will interact, in order to understand the complexities of each system and their potential clinical uses. This chapter will outline and discuss aspects of dental materials science to enable the reader to understand and appreciate the links with relevant histology and relate this to the clinical aspects of minimally invasive operative dentistry. Also discussed is dental amalgam, still a popular restorative material among many dentists worldwide, although clinical indications for its use are becoming more limited as treatment rationales change and adhesive materials improve. This text will require supplementation from suitable dental histology and detailed dental material science texts. Dental resin composites are aesthetic, plastic adhesive restorative materials that consist of co-polymerized methacrylate-based resin chains embedding inert filler particles (conferring strength and wear resistance) and requiring a separate adhesive (bonding agent) to micro-/ nano-mechanically bond them to either enamel or dentine, respectively. However, not all modern dental composites are based purely on this methacrylate resin chemistry (see Section 7.2.6). Therefore the term ‘composite resin’ is inappropriate and should not be used. Resin composites have developed over the past 50 years, after the introduction of the acid-etch technique (Buonocore, 1955) and methacrylate monomers (Bowen’s resin—Bis-GMA (1971); see Section 7.2.2). The unset (or uncured) material consists of a mixture of several different types of resin methacrylate monomers, most of which are hydrophobic (water-hating) in nature (see Figure 7.1). The monomer chain length affects certain properties of the resin composite:… • Viscosity (or flowability) of the material. This is important in order to minimize voids trapped within the uncured composite during placement and packing within the depths of a cavity (the stiffer the consistency, the greater the risk of trapping air voids). The shorter the uncured monomer length (and therefore the lower the molecular weight), the lower is its viscosity. Often shorter-length, lower-molecular- weight methacrylate monomers form the basis of the resin chemistry of flowable resin composites, and other diluent molecules may be added.
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Sivagami, Arasu, Michael Angelo Kandavalli i Bhaskarrao Yakkala. "Design and Evaluation of an Automated Monitoring and Control System for Greenhouse Crop Production". W Next-Generation Greenhouses for Food Security. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97316.
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An embedded system integrated with sensors based on nanomaterial is proposed for closely monitoring and control microclimate parameters 24 hours a day to maximise production over the whole crop growth season by introducing greenhouse for the cultivation of plants or specific plant species. The system will also eliminate errors in human intervention to optimise production of crops. This system consists of sensors and actuators, an Analogue to Digital Converter (ADC) and a Raspberry Pi. The system will determine whether a defined threshold is passed by any climate parameter and systematically changes via the controller. The current work reduces human input through automated irrigation to optimally utilize a scarce resource, namely water. Climatic parameters for plant growth such as, moisture, humidity, temperature, water pressure in drip pipe, soil salinity etc. are monitored and optimized. Furthermore, work was extended to include GSM to control the entire farm remotely. For its success, it is very important to choose a greenhouse location. For instance, the problems are quite different when choosing an adjoining greenhouse, for instance a sunroom or greenhouse. The greenhouse location should be chosen for sunlight, proximity to power and water sources, wind, drain and freeze pockets, and the proximity of the garden and house. The intention behind accomplishment and devise of GSM based Fertigation System is to construct and evaluate the requirement of water in the yield as farming is the major resource of production which habitually depends on the water accessibility. Irrigation of water is usually done by manual method. To ease the work of the farmer GSM based automatic Fertigation (includes chemigation too) system can be implemented so that water wastage can be reduced and also the fertilizer can be added accordingly. Also the Soil Salinity can be checked and reduced if exceeds certain limit. By using GSM, only GSM command via GSM mobile can control the start and stop action of a motor that feeds the field with the water. GSM is used for controlling the entire process and the entire system backbone. It can be used from any distance to control irrigation. The results are assessed by electronic simulator PROTEUS using the desired optimised parameters, the design of this automated greenhouse system with PIC controller. As the inputs to the microcontroller and as an LCD screen record the respective outputs, the model produces a soil moisture sensor, light sensor and temperature sensor. The system performance is accurate and repeatable for measuring and controlling the four parameters that are crucial for plant growth - temperature, humidity, soil moisture and light intensity. With the reduction in electricity consumption, maintenance and complexity, and a flexible and precise environment control form for agriculture, the new system successfully cured quite a couple of defects in existing systems. Nano composite film sensors (Graphene and Graphene mixed in order to optimise the input of fertilisers for chemical composition determination. Using nano technology in agriculture enforces the firm bond between the engineer and farmer. Nano material film-based gas sensors were used to measure the presence of oxygen and CO2.using graphene nano composite sensors integrated into an embedded system, to detect the presence and levels of gases. Improve crop growth with combined red and blue light for lighting under the leavened and solar-powered LED lighting modules. This was achieved by graph/solar cells. The light was measured at the photosynthesis flux (PPFD) of 165 μmol m-2 s-1 by 10 cm of its LED module. LED lights were provided between 4:00 a.m. and 4:00 p.m. in the daytime treatments and night treatments from 10 to 10 hours. The use of the nighttime interlumination of LEDs was also economical than the interlumination of charts. Thus, nightlighting LEDs can effectively improve plant growth and output with less energy than the summer and winter times. Solar panels are best functioning during times of strong sunlight today, but begin to wan when they become too hot and cloudy. By allowing Solar Panels to produce electricity during harsh weather conditions and increase efficiency, a breakthrough in graphene-based solar panels can change everything. Ultimately with a fully autonomous system, agricultural productivity and efficiency, the length of the growing season, energy consumption and water consumption were recorded and monitored by exporting the data over GSM environment. With the steady decrease in the cost of high-performing hardware and software, the increased acceptance of self-employed farming systems, and the emerging agricultural system industry, the results will be reliable control systems covering various aspects of quality and production quantity.
Streszczenia konferencji na temat "Ordered Nano-composite"
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Trask, Richard S. "Ultrasonic Assembly of Biologically Inspired Anisotropic Short Fibre Reinforced Composites". W ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7558.
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In nature, both material and structure are formed according to the principles of biologically controlled self-assembly, a process defined as the spontaneous and reversible ordering of small molecular building blocks under the influence of non-covalent, static interactions. The orientation and distribution of reinforcing entities in engineering composites is key to enabling structural efficiency, yet the architecture remains simplistic when compared to the distinctive and unique hierarchies found in Nature. These biological ‘composite’ materials achieve such configurations by accurately controlling the orientation of anisotropic nano- and micro-sized ‘building blocks’, thereby reinforcing the material in specific directions to carry the multidirectional external loads at different length scales. Capturing the design principles underlying the exquisite architecture of such biological materials will overcome many of the mechanical limitations of current engineering composites. The scientific vision for this study is the development of a novel and highly ordered complex architecture fibrous material for additive layer manufacturing. Using novel chemistry and controlled field-effect assembly, functionally graded, stiffness modulated architectures, analogous to those found in nature, are synthesised to realise enhanced mechanical performance, multi-dimensional composite structures. To achieve this, both hierarchical discontinuous fibres (glass fibres with ZnO nanrods) and a new type of ultrasonic device has been developed. The two studies reported here have been successfully employed to manufacture and mechanically characterise the fibres and aligned discontinuous fibres. A 43 % improvement in strength was observed for samples tested parallel to the direction of the fibre reinforcement over those strained normal to the fibre direction, despite the relatively low volume percentage of the reinforcement phase. This technique shows great potential for the low cost instantaneous alignment of structural reinforcement to generate the light-weight high performance structures required for the future.
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Xin, Yi-Hang, Kai-Ming Hu, Xiu-Yuan Li, Er-Qi Tu i Wen-Ming Zhang. "A Flexible Mechanical Composite Micro-Grating Tailored By One-Dimensional Ordered Wrinkle Patterns". W 2021 IEEE 16th International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2021. http://dx.doi.org/10.1109/nems51815.2021.9451470.
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Ton-That, Minh-Tan, Jianming Li i Weawkamol Leelapornpisit. "The Role of Interface in Fabrication of Clay-Polyolefin (PO) Nanocomposites: Computation and Reality". W ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17045.
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The effect of interfacial interaction between the nano-particles and the polymer matrix plays a determined role in the fabrication of polymer nanocomposites. For layered structure nano-particles like nanoclays, depending on the level of such interaction, the dispersion of the nanoclays can vary from micro-size (micro-composite) to nano-size (nano-composite, both intercalated and exfoliated structure). This article focuses on the effect of the interaction between the nanoclay and polypropylene matrix on the dispersion of the obtained nanocomposites. Both computation (molecular modeling) and experiments have been conducted on various systems (with different modifications of clay surface) in order to get a better understanding about this complex issue. The results have provided different useful highlights for the fabrication of polyolefin nanocomposites.
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Ahuja, Suresh K. "Visco-Elastic Modulus and Intercalation of Polymer Chains in Epoxy Nano-Composites". W ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42503.
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Polymer nano-composites (PNC) are polymers which are reinforced with less than 5% by volume of nano-sized particles with high aspect ratios (L/h > 300). Compared to conventional composites, where the reinforcement is on the order of microns, the nano-composites are reinforced on the order of a few nanometers with advantages in processing and toughness. Nano-composites of epoxy clay have been studied where epoxy is mixed at high shear rates with clay. In our method of making nano-composites, an epoxy, Diglycidyl ether of bisphenol (DGEBA) A was mixed under high shear with organically modified mica type silicate (OMTS) either of benzyl dimethyl stearyl ammonium (BDSMA) or of methyl bishydroxyethyl stearyl ammonium chloride ion exchange with sodium montmorillonite. Nano-composites of epoxy cured with hexahydrophthalic anhydride (70%) with polyether polyol (25%) were made also under high shear both at 90C and 120C. Heat of reaction and transition temperature of epoxy nano-composite was compared with cured epoxy nano-composite. Analysis by X-Ray Diffraction was used to determine peaks, spacing and interfacial region. Dynamic visco-elastic measurements were used to distinguish between the nano-composites from two organically modified mica type silicates. Effect of increase in concentration and temperature on visco-elastic modulus of nano-composites was analyzed in terms of intercalation of polymer chains.
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Adachi, Koshi, Hisakazu Sato i Koji Kato. "Formation Mechanisms of Tribo-Coating for Low Friction in UHV". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64274.
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Solid lubrication film formed by tribo-coating, which deposits a solid lubricant by evaporation to the contact interface during friction in vacuum, gives low friction coefficient below 0.03 that can not be observed by any other solid lubricants of soft metals. The tribo-coating film formed on the pin has nano-order composite structure which the crystalline indium of nano size are distributed in an amorphous matrix of silicon oxide and chromium oxide. Because of the nano composite structure, a very thin indium film is formed without break down like conventional pre-coated thin film. The thinner indium film can give smaller value of friction coefficient than that of conventional solid lubricant.
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Li, Daizong, Serdar Tumkor, Souran Manoochehri i Kishore Pochiraju. "Fabrication of Polymeric and Polymeric Nano-Composite MEMS Structures". W ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12460.
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This paper presents methodologies for rapid prototyping of complex and functional polymeric MEMS structures using lithography steps only. In order to overcome stiffness and strength limitations of the polymeric structures, reinforcing nano-materials were added to enhance stiffness. A challenge in processing polymeric MEMS devices is achieving the release of the MEMS structure from the substrate. This paper presents several process sequences and photoresist combinations that produce freestanding polymeric MEMS structures. Negative photoresist (SU8) and positive photoresist (AZ4620) materials were used in spin coat, bake, exposure and selective development steps. This paper describes the experiments used for determining the optimal process parameters and the release performance. In addition, the paper also illustrates exposure control techniques that reduce process-induced defects such as heat–induced bubbles, degassing and overexposure.
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Boparai, Kamaljit Singh, i Rupinder Singh. "Experimental Investigations for Wear Properties of Rapid Tooling With Nano Scale Fillers for Grinding Applications". W ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2710.
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This work is focused on the experimental investigations for wear properties of rapid tooling with nano scale fillers for grinding applications. The rapid tooling has been prepared by using composite material feed stock filament (consisting of Nylon6 as a binder, reinforced with biocompatible nano scaled Al2O3 particles on fused deposition modeling (FDM) for the development of grinding wheel having customized wear resistant properties. A comparative study has been conducted under dry sliding conditions in order to understand the tribological characteristics of FDM prints of composite material and commercially used acrylonitrile butadiene styrene (ABS) material. This study also highlights the various wear mechanisms (such as adhesive, fatigue and abrasive) encountered with newly prepared composite material while grinding. The FDM printed parts of proposed composite material feedstock filament are more suitable for grinding applications especially in clinical dentistry.
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Suzuki, M., S. Sodeoka i T. Inoue. "Study on Alumina-based Nano Composite Coating Prepared by Plasma Spray". W ITSC2003, redaktorzy Basil R. Marple i Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0701.
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Abstract In order to obtain nano-structured ceramics composite coating for high temperature application, pre-mixed Al2O3/Y2O3 powders were plasma-sprayed in this study. Plasma spraying of spray-dried Al2O3/Y2O3 powder resulted in the formation of amorphous coating of metastable Al2O3-Y2O3 solid solution. After the heat treatment, α-Al2O3/YAG nano-structured composite coating was successfully obtained via eutectic reaction between Al2O3 and Y2O3. It was possible to control the sizes of Al2O3 and YAG particles widely by heat treatment with proper condition. Hardness of the coatings showed close relationship with their microstructure.
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Karibeeran, Shanmuga Sundaram, Dhanalakshmi Sathishkumar, Sankar Ramaiyan i Rajamanickam Subban. "Investigations on the Structure and Properties of the Hot Extruded AA2014-Nano SiCp Composite". W ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87237.
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Aluminium based metal matrix composites with nano particle reinforcement are currently finding wide spread applications in automobile, aerospace and space structures because of their high strength, fatigue life, excellent wear resistance, low thermal coefficient value. However, in order to use these materials for critical automotive applications, extensive study in terms of manufacturing feasibility of the composites have to be carried out. Based on the objectives, the present investigation focuses on the development of Aluminium-SiC nano composite for structural applications. The aim of this research work is to arrive at an optimum weight faction of nano particle which gives the highest properties of the nano composite. The composites were produced by stir casting route. The base alloy and the composites were extruded and subsequently subjected to age hardening treatment. Microstructural evaluation, hardness studies were carried out on both the base alloy and the composites in the as-cast and extruded conditions. The effect of extrusion on the microstructure and properties of the AA2014-0.8 wt.%SiC composites have been discussed in detail.
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Legoux, J. G., F. Chellat, R. S. Lima, B. R. Marple, M. N. Bureau, H. Shen i G. A. Candeliere. "Development of Osteoblast Colonies on New Bioactive Coatings". W ITSC2006, redaktorzy B. R. Marple, M. M. Hyland, Y. C. Lau, R. S. Lima i J. Voyer. ASM International, 2006. http://dx.doi.org/10.31399/asm.cp.itsc2006p0059.
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Abstract The aging baby boomer population coupled with an increase in life expectancy is leading to a rising number of active elderly persons in occidental countries. As a result, the orthopedic implant industry is facing numerous challenges such as the need to extend implant life, reduce the incidence of revision surgery and improve implant performance. This paper reports results of an investigation on the bioperformance of newly developed coating-substrate systems. Hydroxyapatite (HA) and nano-titania (nano-TiO2) coatings were produced on Ti-6Al-4V and fiber reinforced polymer composite substrates. In vitro studies were conducted in order to determine the capacity of bioactive coatings developed to sustain osteoblast cells (fetal rat calvaria) adherence, growth and differentiation. As revealed by SEM observations and alkaline phosphatase activity (ALP), cell adhesion and proliferation demonstrated that HA coatings over a polymer composite are at least as good as HA coatings made over Ti-6Al-4V substrate in terms of osteoblast cell activity. Nano-TiO2 coatings produced by high-velocity oxy fuel (HVOF) spraying led to different results. For short term cell culture (4.5 and 24 hrs), the osteoblasts appeared more flattened when grown on nano-TiO2 than on HA. The surface cell coverage after 7 days of incubation was also more complete on nano-TiO2 than HA. Preliminary results indicate that osteoblast activity after 15 days of incubation on nano-TiO2 is equivalent to or greater than that observed on HA.