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SEM of control gelatin scaffold (G), and the four composite scaffolds confirm the porous structure, data are not presented.
The conventional composite scaffold show low porosity in C(G/30% Si-CHA) and well developed porous structure, with pores of different sizes and shapes oval, rounded, web-like and interconnected, in C(G/50% Si-CHA).
The desired porous structure was not attained by the conventional gelatin/Si-CHA composite, despite the same processing conditions of freezing and lyophilization.
The sublimation of ice crystals carried out below the ice-freezing temperature allowed the scaffold to maintain its structure in a frozen state, where the size and shape of pores were controlled by the size of ice crystals.
Chemistry Central (2011) 5-74

An unstructured, rough and inconsistent fiber structure with very restricted reutilization possibilities is recovered and the recyclate can only be used in low valuable applications like as fillings in paints or in building materials [16].
Initially the chemical structure of the epoxy resin must be analyzed for potential enzyme cleavage sites (see Fig. 2).
Figure 2: Scheme of the chemical structure of a bisphenol A-epoxy resin cured with a triamine hardener Epoxy resins in CFRP are cured with a hardener to form a three-dimensional, solid structure.
After separation processes the target enzyme is obtained in pure form and can be analysed regarding its amino acid structure.
Güebitz, Enzymatic and chemical hydrolysis of poly(ethyleneterephthalate) fabrics, Journal of Polymer Science: Part A: Polymer Chemistry 46 (2008) 6435-6443

Hence, more researchers have focused on modifying the electronic structure of TiO2 by band-gap engineering, i.e., narrowing its band-gap or modifying its surface to enhance visible-light response [10].
Although this method achieves excellent doping at various concentrations, it introduces defects on the TiO2 structure which can act as recombination centers, hence decreasing its photocatalytic activity [13].
The Cu-TiNTs were characterized for their surface morphology, surface chemistry, and elemental composition and then used as a photo-electrode for the degradation of Acid Orange 52 (AO 52).
The nanotubular structure of the Cu-TiNTs allows fast electron transfer due to quantum confinement effects which can further contribute to enhancing its photocatalytic and electrocatalytic performance [13].
Pirbazari: Nano-Structures and Nano-Objects Vol. 8 (2016), pp. 7-14 [29] G.

Equilibrium structures of adsorption models were obtained under different humidity after simulation.
Equilibrium criterion and structures.
Molecular dynamics studies on the structure and properties of energetic systems.
Surface Chemistry.
The relationship of impact sensitivity with structure of organic high explosive.

As expected, the designed variables notably affected the weight loss, color change characteristics, and silica chemical structures.
This burning and other related activities are often performed between 500 and 800 °C as it is acceptable to retain the structure of the RHA [15].
Figure 3 shows the crystallographic structure of silica ash with an intense broad peak indicating the RHA remained as amorphous silica in the temperature range 650 to 750 °C.
· Different incineration conditions affected the structure of the ashes.
Yang, “Rice husk, rice husk ash and their applications,” in Rice Bran and Rice Bran Oil: Chemistry, Processing and Utilization, 2019

FCC Gasoline Upgrading over Modified Nanoscale HZSM-5 Catalyst Xiaobo Zhao1, a 1College of Chemistry, Baicheng Normal University, Baicheng, 137000, China azhaoxb0514@126.com Keywords: Nanoscale HZSM-5, FCC gasoline, Olefin, Sulfur, RON.
Catalysts dealuminated by means of steam treatment generate a secondary pore structure that can contribute to the enhancement of aromatization stability by reducing diffusion limitations [7].
The XRD pattern of the modified nanoscale HZSM-5 catalyst completely matches that of the parent nanoscale HZSM-5, which indicates that the combined-modification measurement has no obvious effect on crystal structures.
Since the framework Al is mainly responsible for the acidity of zeolite, the hydrothermal treatment leads to dealumination of the zeolite structure and hence, to a decrease in total acidity of the parent catalyst.
Lin, Structure and acidity of Mo/ZSM-5 synthesized by solid state reaction for methane dehydrogenation and aromatization, Micropor.

A qualitatively new level of properties is determined by the atomic structure of nanoparticles, which differs from crystals and amorphous materials.
UFD particles are 4–6 nm in size and consist of a cubic diamond core (4–5 nm) enclosed in a shell of carbon transition structures with a thickness of 0.4–1 nm.
At the same time, the amount of structured carbon is not less than 95 %.
The crystallization conditions and structure of electrodeposited chromium are very owl-like.
Chemistry and Chemical Technology 63(8) (2020) 4-38

The UV-Vis absorption spectrum of gelatin exhibits strong absorption below 250 nm, which can be attributed to the non-aromatic amino acids in its molecular structure.
While the absorption in the region of 250-300 nm with a maximum at 280 nm is due to the presence of aromatic amino acids in the molecular structure of gelatin [6].
The difference is possibly owing to the presence of both tyrosine and phenylalanine in the molecular structure of gelatin.
As mentioned in Section 3.1, the fluorophores in the molecular structure of gelatin are tyrosine and phenylalanine.
Since there is no chromophore in the molecular structure, PEG does not absorb ultraviolet nor visible light.

An important way to characterize the defect structure in materials is by means of self-diffusion.
The displacement of the diffusing atom is given by [10] (2) Diffusion mechanism: geometry of ring Consider the ZnO nanoparticle to possess the zincblende structure.
But this can be a reasonable approximation because the XRD measurements on nano ZnO reveals zincblende structure where lattice parameters and grain size are found out.
For the vacancy mechanism in our systems H and n are 0.78146 and 12, respectively, as they belong to zincblende structure, , where a is the lattice constant of the system.
Secco: Canadian Journal of Chemistry, 39 (1961) 1544 [9] J.

As described above, while the polymer seems to exhibit smooth structure, CMC arranges itself into fibrous structure.
At the contact with CMC takes place an electrostatic attraction between Ca2+ ions from HA with the carboxyl anions, from the CMC structure, which is not a classical ionic exchange interaction, being more intense in an acidic medium [19].
FTIR spectra of biomaterials involved in experiments The interaction between CMC with HAp in this composition is visible in FTIR spectra through the widening of OH group bands (3500-3000 cm-1), more pronounced for Hap : CMC = 50%-50%, due to the hydrogen bonds between the H atoms and OH groups existing in the structures of the two components, as well as electrostatic binding of the two components, Ca2+ ions located on the HAp surface are coming into contact with the COO2- ions from the CMC surface, forming ion-pairs COO2-Ca2+.
Millane, Crystal structure of valonia cellulose 1b, Macromolecules. 31 (1998) 7776–7783
El Seould, A Koschella, LC Fidale, S Dom, T Heinze, Applications of ionic liquids in carbohydrate chemistry, Biomacromolecules. 8 (2007) 2629–2647