Search results

Results and Discussion Membrane Characterization Membrane XRD analysis was able characterize some superficial properties of the structure.
Figure 1 shows the XRD curve of polyurethane structure.
The decomposition temperature of PU is mostly influenced by the chemical structure of the component having the lowest bond energy [10].
Journal of Industrial and Engineering Chemistry 44 (2016) 67–72
Journal of Molecular Structure 1100 (2015) 401-414

Analysis of the effect of niobium content on the elastic modulus in the Ti-Nb system [12] showed that the minimum values of Young's modulus (about 60 GPa) are observed in the concentration range of 39-42 mass % Nb, when mechanically unstable β-phase is fixed in the structure during quenching.
It should be noted that in the Ti-45Nb alloy with a stable β-phase structure, adding tin in a concentration range of 2-6 mass % contributes to an increase in the Young's modulus from 63 to 74 GPa [20], i.e. the modulus changes as if the niobium content was increased in the alloy.
Skiba, Effect of heat treatment and plastic deformation on the structure and elastic modulus of a biocompatible alloy based on zirconium and titanium, Physics of Metals and Metallography. 113(4) (2012) 382-390
Popov, Relationship between structure, phase composition and physicomechanical properties in quenched Ti-Nb alloys, Physics of Metals and Metallography, 120(2) (2019) 156-162
Landolt-Börnstein - Group IV Physical Chemistry (Numerical Data and Functional Relationships in Science and Technology), J.

However, until recently, furan-based polymers were just ones of the several new structures, and, therefore, received insufficient attention.
They vary considerably from one study to another with the same PA structure.
The AC particles had a porous structure and sizes of 1–15 µm.
Thereby, a layered structure of graphite exhibits low values of friction and wear, while amorphous AC does not provide high efficiency under dry friction.
Belgacem,  Furans in polymer chemistry. 

N2 adsorption-desorption isotherms (Fig. 2c) of the graphene is of the type IV isotherm as per the classification of the International Union of Pure and Applied Chemistry (IUPAC).
As observed, the coating method did not significantly alter the structure of the paper (Fig. 4).
This may be caused by the difficulty of coating graphene through dipping to penetrate within the internal structure of cardboards and more so in composite plyboards.
Xie, Preparation of zinc nano structured particles from spent zinc manganese batteries by vacuum separation and inert gas condensation, Sep.
Ago, Synthesis, structure and applications of graphene-based 2D heterostructures, Chem.

Below TSMT, VO2 is monoclinic structure, a semiconductor and IR transparent, while above TSMT, it is tetragonal rutilestructure, a metal, and IR reflecting [2].
The crystal structures of the films were characterized by X-ray diffractometer (Rigaku Ultima IV) with 2θ coupled scan mode (CuKα radiation with a wavelength of 0.15418nm).
This may be attributed to subatrate bias influences the crystal structure and micro defects in the films, which are closely related to optical bandgap.
Different crystal structures, average grain sizes, surface morphology, electrical and optical properties were obtained by simply increasing substrate bias of the W-doped VO2 films.
Sanchez, Sol-gel chemistry of transition metal oxides, Solid State Chem. 18(1988) 259

The chemical structure of modified NCF is shown in Fig 1. 100 grams of NCF slurry in water (7.0% solid content) was mixed with 250 ml of NMP solvent.
The chemical structure of modified NCF with different acid types; (a) succinic anhydride, (b) phthalic anhydride and (c) citric acid Characterization of NCF and modified NCF.
The effect of the steric hindrance of SA structure is less than that of PA and CA resultly higher ability to undergo a reaction with the NCF surfaces.
Tiwari, Materials chemistry and the futurist eco–friendly applications of nanocellulose: Satatus and prospect, J.
Wu, Cellulose nanoparticles: Structure–morphology–rheology relationship, ACS Sustainable Chem.

(a) Central porosity distribution as-cast billet (b) Central porosity as-cast Ingot (c) typical Porosity structure (as-cast) for low carbon (left) and high Carbon (right) steels (d) Magmasoft micro-porosity formation post Ingot teeming Fig. 1: Typical morphology of porosity in as-cast products (billet/ingot) Despite improvement in ingot design, casting conditions and modelling of solidification, the downstream operation from casting whether in-line ([4] or off-line has traditionally been aimed through reheating and rolling recipes to close and ideally heal as-cast porosities from cast products.
Despite many advances in the field of ultrasonic (phase array, etc.), in-situ plant measurement of soundness on directly as-cast products remain challenging in view of as-cast product shape/surfaces (ingots) but mostly signal attenuation due to grain structure.
Further developments are required to account for more explicit effect of grade chemistry.
Farrugia, Micromechanical modelling of Void Healing, Micromechanical Modelling of Void Healing, (2013), IUTAM Symposium on Advanced Materials Modelling for Structures (AMMS 2012), Advanced Structured Materials 19, 1-8

Corrosion Behavior on Titanium Alloys as OCTG in Oil Fields Xinyu WANG1,a, Shidong ZHU1,b*, Qiang LIU2,c, Anqing FU2,d, Jinling LI3,e 1School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China 2State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an 710077, China 3School of Chemistry & Chemical Engineering, Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields, Xi'an Shiyou University, Xi'an 710065, China awangxinyu@cnpc.com.cn, bzhusd@xsyu.edu.cn, cliuqiang@cnpc.com.cn, dfuanqing@cnpc.com.cn, elijinling@xsyu.edu.cn Keywords: Titanium alloy; TC4; Oil country tubular goods; Corrosion type; Corrosion mechanism.
But corrosion resistance of titanium and titanium alloy rooted in a tight protection film surface oxide generated by the extremely easily, the oxide film is not only good, protective and adhesive strength with substrate, but not a single structure, with the generating conditions being different, the main structure are TiO, TiO2, Ti2O3 and so on, the reason is that oxygen atoms in the oxygen-rich layer are more likely to enter the octahedral gap of α-Ti.
Structure, mechanical and tribological properties of self-toughening TiSiN/Ag multilayer coatings on Ti6Al4V prepared by arc ion plating[J].

It is proposed that the formation of ettringite from sulfate in PG can squeeze the large pore volumes, making the structure denser which positively affects the mechanical properties of the mixture.
Generally, achieving compressive strength levels close to or higher than that of the control mixture for PG mixtures may be attributed to the formation of a denser structure.
The adequate usage of PG leads to the formation of a certain level of ettringite that fills the pore area, providing a denser structure [6].
For a low concentration of PG, ettringite formation by cement and calcium sulfate (PG) allows to fill the pores and reach a denser structure, achieving better long-term strength.
Saueia et al., Lixiviation of Rare Earth Elements in Tropical Soils Amended with Phosphogypsum, International Journal of Environmental Analytical Chemistry, vol. 100, no. 6, pp. 675–685, Jul. 2019, doi:10.1080/03067319.2019.1638918

The barrier effect of MMT nanolayers slows down the release of volatile products in nanocomposites due to the labyrinth-like structure of the silicate layers within the polymer matrix [14].
Previous research [15] has demonstrated that excessive MMT aggregation in the coating can result in uneven dispersion, potentially delaying the formation of a fused carbonaceous structure through a "wick effect".
It is suggested that the close arrangement of nano clay structures can enhance the barrier properties of epoxy coatings.
In Fig. 7(a), plate-like particles with d-spacing ranging from 20.8 to 46.6 nm are visible, while in Fig. 7(b), cylinder-shaped HNT structures are intricately distributed, with corresponding d-spacing ranging from 26.0 to 61.8 nm.
Industrial & Engineering Chemistry Research. 55, 11186-11192 (2016) [12] M.