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Online since: April 2020
Authors: Ren Chen Liu, Jing Lu
Through the above study, AZO thin film sputtered at 25 ℃ exhibits smaller crystallites and leads to regular granular structure upon etching was more suitable for demoulding than that of crater structures sputtered at 200 ℃ and 400 ℃.
The reason for this was that regular granular structure will make PAA film endure strength uniformity than crater-like structure during etching in weak acid.
Polymer Chemistry, 2014, 5(14):4219
Periodic structure with a periodicity of 2–3.5?
Modified Thornton model for magnetron sputtered zinc oxide: film structure and etching behavior [J].
Online since: January 2017
Authors: Dong Lin Zhao, Cheng Li, Fei Fei Sun, Xia Jun Wang, Ran Ran Yao
The morphology and structure of the samples were observed by transmission electron microscope (TEM, Hitachi H-800).
Result and discussion Morphology and structure of GNs and GNs–Fe3O4 hybrid.
The morphology and structure of GNs and GNs–Fe3O4 hybrid were characterized by TEM and their images are shown in Fig. 1.
Moreover, the thin wrinkled structure represents a curled and corrugated structure that the graphene owns intrinsically [23].
XRD and electronic diffraction (ED) of GNs–Fe3O4 hybrid indicated the inverse cubic spinel structure of Fe3O4.
Online since: January 2010
Authors: Po Hui Chen, Ting Yun Kuo, Da Ming Wang, Hsyue Jen Hsieh, Juin Yih Lai
Formation and structure of chitosan [9] Figure 2.
In the above steps, the pore structure of the membranes were formed and fixed.
Scanning electron microscopy (SEM) was utilized to observe the pore structures of the membranes.
As mentioned in the introduction, molecular structure of gum arabic has more branches than that of pectin.
Walter, The Chemistry and technology of pectin, Academic Press, San Diego, 1991
Online since: December 2005
Authors: L. Micele, D. Prandstraller, Giuseppe Pezzotti, Goffredo de Portu, G. Palombarini
However, it should be noted that the residual stress field also significantly depends on the geometry of the layered structure, in particular on the thickness ratio among layers [4].
To obtain a perfectly symmetrical structure, two A layers were used on each external side.
As reference materials both laminated structures containing eleven layers of pure alumina, obtained with the above mentioned procedure (S1) and monolithic alumina (S0) were used.
Figure 1 shows the residual stresses measured with fluorescence piezo-spectroscopy and the cross section of the AZ/A laminated structure (specimen S2, S3 and S4).
In figure 3 the enhancing of wear resistance is better illustrated: the specific wear coefficient κ (the slope of the lines of fig. 2) is plotted versus the geometry of the layered structure.
Online since: November 2022
Authors: Kevin C. Igwilo, Nnaemeka Uwaezuoke, Victor Okoro, Stanley I. Onwukwe, Kingsley C. Iwuanyanwu, Victor C. Ayogu
These properties determine the clay's quality, engineering behavior, and commercial value due to origin, composition, and physical chemistry [8, 9].
The thickness of a layered or stacked clay structure is about 10 Ǻ.
Attapulgite-sepiolite clays have a chain-like structure and are the major exceptions to this.
Also, due to the presence of kaolinite, muscovite, and chlorite, viscosity in water is expected to be low and expected structure sheet-like.
Hindawi Journal of Chemistry, 2018; 6252913.
Online since: March 2008
Authors: L. Lawrence Chapoy, John M. Lally
Adding water to the monomer mix directly adversely affects the polymerization chemistry
The chemistry involved is minimal because the polymer is already formed through the macromer.
Since these two very different chemical compositions are not miscible, the process chemistry must control the two phase morphology in a very critical way.
Sci.: A: Chemistry, 35, 3603 (1997)
Kuhn, The Structure of Scientific Revolutions, University of Chicago Press, 1996.
Online since: August 2006
Authors: U. Galietti, G. Pitarresi, A. Conti
A comparison is made with the thermoelastic signal predicted by two different analytical models: one based on the classical law of the thermoelastic effect for orthotropic materials, and the other based on a novel theory accounting for the presence of a resin layer on the external surface of the composite structure.
The works of Dunn [4] and Zhang et al. [5], based on graphite-epoxy composite structures, have been the first to provide some deeper insight on the influence of the surface resin rich layer on the thermoelastic signal.
Given the very great number of variables that need to be considered when describing the thermoelastic behaviour of a composite structure, further work needs to be done to ascertain that the behaviour observed in this work is repeatable in a predictable way.
Physics and Chemistry of Solids, vol. 52(3), (1991) p.483
Online since: January 2013
Authors: Lin Xiu Zhao, Si Guo Yuan, Jiao Sha, Shao Bin Li
The chemical and pore structure of above polymers were characterized by FT-IR and BET.
In recent years, polymeric adsorbents, due to their wide variations in porosity and surface chemistry, especially regenerability on site and reusages for continuous process, have been increasingly used to remove and recover organic pollutants from waste streams.
The specific goal for the work reported here is to examine the effect of the pore structure of the polymeric adsorbents on adsorptive properties toward MB.
Fig. 1 Molecular structure of MB Polymeric adsorbent.
Online since: July 2017
Authors: O.L. Shanmugasundaram, Chitra Umachitra, N.K. Palaniswamy, P.S. Sampath
Natural fibers have been used to reinforce materials in many composite structures.
Kumar et al. [5] investigated that alkaline treatment cleans the fiber surface impurities, modifies the surface structure and increases the fiber surface area.
For producing Banana cotton woven fabric (BCWF), Banana fibres were used as weft structures and the warp yarns were of cotton with 40s count.
Rojas, Cellulose Nanocrystals: Chemistry, Self-Assembly and Applications, Chemical Reviews. 110 (2010) 3479-3500
Online since: June 2017
Authors: Moon Il Kim, Bong Kuk Seo, Hye Ryun Lee, Hye Ryun Na, Choong Sun Lim
The structure and morphology of the modified silica nanoparticles and epoxy/silica composites were analyzed using field emission scanning electron microscope.
However, these silica particles can easily aggregate due to an increase in the surface silanol structure and surface energy [10].
Kickelbick, Study of the effect of the concentration, size and surface chemistry of zirconia and silica nanoparticle fillers within an epoxy resin on the bulk properties of the resulting nanocomposites, Polymer Int. 61(2) (2012) 274-285
Saeb, Structure-property relationship in epoxy-silica hybrid nanocomposites: The role of organic solvent in achieving silica domains, J.