Abstract This paper reports a new strategy (rapid and selective microwave irradiation) to achieve an improved yield of graphene-like material derived from coconut shell biomass. The influence various irradiation (MWI) powers (80, 240, 400 W) treatment on the crystalline structures, morphology, electrochemical performance produced samples was determined compared with virgin-untreated specimen. obtained were analyzed using varied analytical techniques. FESEM images irradiated revealed...

Ferrite being a compound derived from iron oxides including magnetite and hematite possesses similar properties as ceramics which are hard brittle. Certainly, the mounting demand for electronics has been major factor driving exponential growth of ferrite based materials. ZnO doped strontium-natural nanoferrites composition (80 − x)Fe2O3:xZnO:20SrCO3, where x = 0, 10, 20 mol% synthesized sintered via solid state reaction scheme. Samples characterized by SEM, XRD, VSM, VNA measurements to...

We present a density functional theory calculation for the adsorption and dissociation of OOH on Pt(111) Pt(111)-alloy surfaces. confirmed theoretical understanding an activated surface small Pt clusters. Interestingly, in this work, we found existence “barrierless” several Pt-binary ternary alloy surfaces with Ru Mo as alloying components: PtRu PtRuMo. Here, demonstrate how such reaction proceeds discuss role Ru—O Mo—O spontaneous these systems. The energetics specie is one most sought...

Summary This research explores how methylcyclohexane (MCH) interacts with individual metal atoms M (M= Pt, Pd, and Cu) based on density functional theory (DFT) total energy calculations. We analyzed the adsorption energies of MCH these to understand their stability reactivity. The results show that prefers attach single Pt atoms, which exhibited strongest energy. Compared Pt(111) surfaces, were slightly higher, indicating enhanced at nanoscale. Adsorption Pd Cu resulted in lower than Pt....

We studied the site preference of methanol (CH3OH) and methoxy (CH3O) on Pt, PtRu PtRuMo surfaces using density functional theory. This work aimed to investigate nature adsorption in relation energetic properties charge transfers clarify role alloying metal Ru Mo properties. Similar geometry these three was observed. The largest transfer observed PtRuMo-, followed by PtRu- Pt-surfaces, resulting strength order binding energy. also found that donates amount charge, Pt pure surface; we...

We present density functional calculations for the adsorption of hydroxymethylidyne (COH) on Pt, PtRu, and PtRuMo (111) surfaces. Here we clarify mechanism by using a charge transfer analysis related to energy. observe that preferred binding sites COH are hcp hollow Pt–Pt–Pt, Pt–Ru–Pt, Pt–Ru–Pt PtRuMo, respectively. Addition Ru form PtRu surface increases energy, while addition Mo decreases it. Our analyses show energy is determined electron between molecular metal surfaces associated with bonding.

We performed first-principles simulations based on the density functional theory for investigations atomic geometry of La2GeO5, which is a fast oxygen ion conductor applicable to solid oxide fuel cells. While two experimental studies have reported contradicting results about configuration GeO4 tetrahedral substructures, i.e., sp2- or sp3-like, we found that only sp3-like form stable. confirmed favorability sites vacancy formation fundamentally affected by this configuration. The bonding...

Adsorption mechanism of carbon monoxide (CO) on PtRu and PtRuMo alloy surfaces is investigated using density functional theory (DFT). It includes evaluation binding configuration the adsorption strength. The results show that CO preferentially adsorbs onto 3 fold hollow site PtRu-surface, while surface we observe shift from fcc to near bridge site. We also note energy stronger than surface. From charge transfer analysis, conclude caused by more transferred surface-adsorbate bonding region...

The manganese-natural ferrite anisotropy magnets were prepared via the solid state reaction method with various sintering temperature of 900, 1000 and 1100 °C for 3 hours. This process performed by doping MnO2 on fe2O3 natural ferrite. XRD, VSM VNA Characterizations carried out to investigate effects structure, magnetic properties microwave absorption capability. characterization results showed that affect microstructure, particle size crystalline phase. Furthermore, including saturation...

A density functional theory calculation is used to investigate the atomic oxygen (O) stability over platinum (Pt) and Pt-based alloy surfaces. Here, connected with preferential adsorption sites for O chemisorptions energy. Thus, interaction mechanism between metal surfaces studied by using charge transfer analysis. In this present paper, structure binding energy of on Pt(111) are in a very good agreement experiment previous calculations. Furthermore, we obtained that addition ruthenium (Ru)...

Reaction pathways for a water molecule dissociation (H 2 O ads ) to form hydroxyl (OH and hydrogen on the Ru-alloyed Pt(111) surface were computationally modelled basis of density functional theory (DFT). The aim this study was evaluate whether or not such reaction can take place determine most probable route reaction. To get answer, we calculated potential energy surfaces (PES) proposed pathways. From results PES scan, then obtained preferential pathway H dissociation, i.e., with an...

Abstract Microwave wide-spread results in electromagnetic interference, environmental pollution, and hazards for health, thus microwave absorber is immediately needed. Mn 4+ doped barium natural ferrites were synthesized using the modified solid-state reaction method, which a combination of sol-gel method reaction. Commercial Ba(NO 3 ) 2 , MnO Fe O 4 used as raw materials. Structural, magnetic properties absorption characterized XRD, VSM, VNA, respectively. The reveal that phase BaFe 2.37...

Abstract A series of lanthanum oxide doped Strontium ferrite material has been produced by using a solid-state reaction method with the composition (1-x) SrO : (x)La 2 O 3 (6)Fe , where x = 0.2 mol. The consists mixing, milling time duration (hour) 0.5; 1.0 and 1.5, pressing, annealing at 800 ° C for 1 hour, sintering 1100 °C hours. XRD, VSM, VNA characterizations have carried out to analyze structure, magnetic properties, microwave absorption capability, respectively. characterization...

The synthesize of Nd 3+ -strontium hexaferrite magnetic material by the solid-state reaction method has been successfully carried out. This study aims to determine effect on structure, properties, and microwave absorption capability material. Preparation (1-x)SrO:xNd 2 O 3 :6Fe where x = 0, 10, 20, 30 mol% using basic in form SrCO powder, powder Fe 4 from natural iron sand. characterization includes X-Ray Diffraction (XRD) examination crystal Scanning Electron Microscope (SEM) for exploring...

We report the different way to explain nature of water molecule (H2O) adsorption on platinum (Pt) surfaces with low Miller index, i.e., (100), (110) and (111). Here, we perform periodic density functional theory (DFT) calculations analyze correlation between water-surface bonding strength observed charge transfer occurring in systems. The results show that Pt-H2O interaction at most stable sites, atop site for each surfaces, follows order H2O/Pt(110) > H2O/Pt(100) H2O/Pt(111). This has...

The Kalman filter algorithm is very important as a recursive method to optimize sensor output from physical parameter measurement systems, especially physics practicum demonstration systems. One of the distance systems used in Hooke’s law system applied practicum, has problems related fluctuating or unstable output. This research implements on Arduino IDE sketch reduce noise that appears at ultrasonic methodology this study includes application with variable value equation modified R=10,...