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Carbon fiber reinforced silicon carbide (C/SiC) composites are considered as one of the most potential thermal structure materials.
But to different structures of the CMCS, the properties are different.
The composite of 3D 4-directional braided structure is a new kind of composites, the structure is showed in fig.1[7].
Interior unit cell model From the narration above that the 2.5D and 3D 5-directional braided structure composite has axial yarns, the property of the composite decrease less when it is machined, but to the 3D 4-directional braided structure composite, when it is machined, the structure is destroyed greatly, the property may be decrease greatly.
The materials are supplied by Nanjing Fiberglass R&D Institute, the carbon fiber (T300,3k, Institute of Coal Chemistry, Chinese Academy of Sciences, China) and polycarbosilane (PCS, National University of Defense Technology) are supplied respectively. 2.1.2 Procedure.

Zirconia ceramic properties (MgO-PSZ) MgO-PSZ Chemistry 10molMgO+ ZrO2 Compressive strength [MPa] 1900 Max. service temperature [OC] 1100 Young modulus [GPa] 200 Hardness [HV] 1020 Density [g/cm3] 5,73 The ring cracks were created on the zirconia balls surface by impact loads.
Tungsten carbide properties Chemistry 93,5 - 94,5 % WC 5,5 – 6,5 % Co Compressive strength [MPa] 5200 Tensile strength [MPa] 1520 Maximum useful temperature [OC] 430 Young modulus [GPa] 640 Hardness [HV] 2200 Density [g/cm3] 13,2 a) 400mm b) 63mm 54mm Figure 5.
Lower balls material properties Si3N4 Steel 1.3505 (DIN) Chemistry 99,9 % Si3N4 0.95-1.1% C 0.25-0.45% Mn 0.15-0.35% Si 1.3-1.65% Cr max. 0.025% P max. 0.025% S max. 0.3% Ni Compressive strength [MPa] 2353 880 Max. useful temperature [OC] 1400 180 Young modulus [GPa] 324 210 Hardness [HV] 1500 700 Density [g/cm3] 3,2 7,8 Table 4.
The primary propagation changes direction (Fig. 10c) and this is connected with structure defects in the material structure.

Conversion of Bacterial Cellulose to Cellulose Nitrate with High Nitrogen Content as Propellant Ingredient SITI HASNAWATI Jamal1,a,*, NURSYAFIQAH Jori Roslan2,b, NOOR AISYAH Ahmad Shah1,c, SITI AMINAH Mohd Noor1,d, ONG Keat Khim1,e, WAN MD ZIN Wan Yunus2,f 1Department of Chemistry and Biology, Centre for Defence Foundation Studies, National Defence University of Malaysia, 57000 Kuala Lumpur, Malaysia. 2Department of Defence Science, Faculty of Defence Science and Technology, National Defence University of Malaysia, 57000 Kuala Lumpur, Malaysia.
It shows bacterial cellulose (Fig. 3a) has inhomogeneous, ribbon like fibrils compared to bacterial nitrocellulose (Fig. 3b) which contain many holes even its maintain original structure of cellulose [1].
Mao, The Solution Characteristics of Nitrated Bacterial Cellulose in Acetone, New Journal of Chemistry 42 (2018) 18252-18258
Taylor, A review of the synthesis, Chemistry and analysis of nitrocellulose, Journal of Energetic Materials 8(3) (1990) 149-203
Holladay, Studying cellulose fiber structure by SEM, XRD, NMR and acid hydrolysis, Carbohydrate Polymers 68 (2007) 235–241.

Thus, to address the additive leaching issue, researchers have explored incorporating tannic acid (TA) as a complexation agent which has polyphenolic structure and able to form strong coordination complexes with metal ions.
Benefiting from its improved surface chemistry and structural advantages, the modified membrane demonstrated a permeability of 540 L.m-2.h-1.bar-1 and achieves an oil rejection of 87% in the context of oil/water emulsion filtration.
Consequently, this chemical interaction modifies the membrane formation process and has a direct impact on the surface structure.
Ashtiani, "Preparation and optimization of antifouling PPSU/PES/SiO2 nanocomposite ultrafiltration membranes by VIPS-NIPS technique," Journal of Industrial and Engineering Chemistry, vol. 88, pp. 292-311, 2020/08/25/ 2020, doi: https://doi.org/10.1016/j.jiec.2020.04.028
Abazari, "Synergistic effect of GO@SiO2 and GO@ZnO nano-hybrid particles with PVDF-g-PMMA copolymer in high-flux ultrafiltration membrane for oily wastewater treatment and antifouling properties," Journal of Industrial and Engineering Chemistry, vol. 108, pp. 374-388, 2022/04/25/ 2022, doi: https://doi.org/10.1016/j.jiec.2022.01.016

Characterization of Bisphenol A Poly(carbonate) after Multiple Processing Cycles Xia Gao1,2,a, Qinyong Mi3 , Wei Zhang1,2, Zhaohui Wang2, Tongna Mu2, Jun Zhang3,b, Ruigang Liu4,c,Jiasong He3, Qingjun Liu1, Jinghua Zhang1 1 Beijing Centre of Physical and Chemical Analysis, Beijing Academy of Sciences and Technology, Beijing 100089, China 2 China National Food Quality & Safety Supervision and Inspection Center (CFQS), Beijing 100094, China 3 CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory of Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China, 4 State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory of Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China agaoxia@iccas.ac.cn, bjzhang@iccas.ac.cn, crgliu@iccas.ac.cn Keywords: bisphenol A poly(carbonate); processing; thermal degradation Abstract.Bisphenol A poly(carbonate) (PC) pellets used for production
It should be indicated that the molecular weight and its distribution recovered a little for the third reprocessing cycle, which might due to the degradation mechanisms of PC and the chemical structures of the degraded products.
It was conclude that branched and cross-linked structure formed during the reprocessing PC samples.

.,173, 360004, Nalchik, Russia 3Kurnakov Institute of General and Inorganic Chemistry Russian Academy of Sciences, Leninsky Prospect, 31, 31119991, Moscow, Russia, 4National Research Tomsk State University, Tomsk, 634050, Russia anellipopovaran@gmail.com, bao_ermakovy@rambler.ru, cantonpopovleonid@gmail.com, dselezneva_i@mail.ru, eakkizov@mail.ru,frunetta05@mail.ru, gvan@igic.ras.ru Keywords: Cerium oxide nanoparticles, low-temperature argon plasma, oxidative stress Abstract.
LTAP includes a variety of damaging factors (Fig. 1), which can lead to a damage of cell structures and organelles.
Usatenko, Structure-sensitive properties and biomedical applications of nanodispersed cerium dioxide.
Ivanov Advances and Prospects of Using Nanocrystalline Ceria in Prolongation of Lifespan and Healthy Aging Russian Journal of Inorganic Chemistry, 60 (13) (2015) 1595–1625
Davydova, Selezneva I., Kopitsa G., Tretyakov Y., One-stage synthesis of ceria colloid solutions for biomedical use, Doklady Chemistry 437 (2) (2011) 103

Textural Characteristics and Structural Peculiarities of Supported Vanadium Oxide Materials Prepared by the NH4VO3 Aqueous Solution Wetness Impregnation SUSHCHENKO Ekaterinaa, KHARLAMOVA Tamarab Tomsk State University, Chemistry Department, 36, Lenin Avenue, Tomsk, 634050, Russia akonfetty13@mail.com, bkharlamova83@gmail.com Keywords: supported vanadium oxide, incipient wetness impregnation Abstract.
Activity and selectivity of supported vanadium oxide catalysts depends on the support nature and vanadium content, determining oxidation state, coordination number, aggregation state, crystallinity and structure of vanadium oxide species on the support surface [2, 3].
According to aqueous phase equilibrium chemistry of vanadium oxide [1], mainly V4O124- anions should present in solution at such vanadium concentration and pH.
Fenelonov, Introduction to the physical chemistry of formation of supramolecular structure of adsorbents and catalysts, Russian Academy of Sciences, Novosibirsk, 2002, pp. 204-207

Inorganic Chemistry, Faculty of Pharmacy, Univ. of Granada, 18011 Granada, Spain 3Dept.
Analytical Chemistry, Faculty of Sciences, Univ. of Granada, 18071 Granada, Spain 5Biosanitary Research Institute ibs.
FTIR spectrum of Ap control reveals the main spectral features of PO43- groups of apatite at ~1025 cm-1 (n3PO4, asymmetric stretching), ~984 cm-1 (n1PO4, symmetric stretching), ~603 and 571 cm-1 (n4PO4, bending), and a peak at 518-520 cm-1 (HPO42-).The presence of the ν3CO3 mode (bands at ≈1421 and 1462 cm−1) and ν2CO3 (871 cm−1 ) can be attributed to some calcite crystals, but also to the presence of carbonate ions in the apatite structure.
Fernández-Sánchez, Luminescent biomimetic citrate-coated europium-doped carbonated apatite nanoparticles for use in bioimaging: Physico-chemistry and cytocompatibility, RSC Adv. 8 (2018) 2385–2397
Journal of Molecular Structure, 1234, 130166.

The use of various structure of cordierite especially porous structure became more popular where its properties can be tailored by controlling the open and closed porosity, cell size distribution and cell morphology.
The crack was also observed along the skeleton like structure in type B which led to fragile property.
Crack Fig. 3: SEM results of the sintered sample using different types of sponge (500x) In addition, sample produced using sponge type C shows denser structure, where connected pores surrounded with web structure.
SEM analysis shows that sponge type C formed denser structure than type A and B.
[3] Yang T.Y., Kim W.Y., Yoon S.Y. & Park H.C., Macroporous Silicate Ceramics Prepared By Freeze Casting Combined With Polymer Sponge Method, Journal Of Physic And Chemistry Of Solids, Elsevier, 71, 436-439, (2010)

The synthesized LiFePO4 samples show well-crystallized structures.
The structure is identified as orthorhombic olivine with Pnma space group.
This indicates that the carbon coating does not influence the crystal structure of the LiFePO4.
Fig.1 (b) shows that the typical LiFePO4/C sample has an agglomerate structure.
The structures of the composites were characterized by X-ray diffraction.