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The specific surface area, activity, inner pore structure, microtopography and expansion properties of the MEA have been investigated.
This may be related to the different porous structures of MEA.
Conclusions MEA has a porous structure formed by the interconnected MgO grain during the sintering process under high temperature.
What's more, the porous structure may also play an important role in the expansion.
Mehta, D.Pirtz, in: 7 th International Congress on the Chemistry of Cement.

While ceramic materials break easily and have hard and dense structures, PVDF is flexible, has a low density and can be easily produced into thin films (Table 1) [5].
In this way, controlling the characteristic of the electric signals and the dimensions structure of the polymer, it is possible to modify its acoustic properties.
This structure will produce the needed acoustic vibration along the channels.
Fig. 2: Schematic representation of the lab-on-a-chip structure.
Analytical Chemistry by Open Learning (1999), p. 2-47

Hence, the use of simple storage structures will be preferable, that will meet rural needs and conditions.
Evaporative cooler works on the principle of cooling resulting from evaporation of water from the surface of the structure.
The four structures in the 7 cm soil inter-space were kept in moist condition using 20 litres of water.
Results and Discussion The various analysis carried out on tomato stored in three different structures are shown in Table 1.
[16] AOAC , Association of official analytical chemistry.

Staab b * University Würzburg, Dep. of Chemistry, LCTM, Röntgenring 11, D-97070 Würzburg, Germany a danny.petschke@uni-wuerzburg.de, b torsten.staab@matsyn.uni-wuerzburg.de Keywords: Al Cu Li-alloy, friction-stir welding, heat affected zone, small-angle X-ray scattering, SAXS, differential scanning calorimetry, DSC, positron annihilation lifetime spectroscopy, PALS Abstract.
By the use of complementary methods, we obtain information on structure, kind and distribution of precipitates and correlate this with hardness measurements.
Ostersehlte form Airbus Bremen providing us with the welded structure and for intensive discussion in conjunction with the Master-Thesis of D.
Atomic structure of T1 precipitates in Al–Li–Cu alloys revisited with HAADF-STEM imaging and small-angle X-ray scattering, Acta Mater., 59 (2011) 462-472
Maier, Atomic structure of pre-Guinier-Preston zones and pre-Guinier-Preston-Bagaryatsky zones in aluminum alloys, J.

Nickel can also have some effect on "fir tree" grain structure in 1000 series alloys and give unwanted variation in anodizing response.
Industrial and Engineering Chemistry Research, 43(26), 8239-8243
[13] Mondolfo, L.F. (1976) Aluminium Alloys: Structure and Properties, Butterworths
[24] Gala, H.B.S., Kee, K.H. and Hucko, R.E. (1989) An Overview of the Chemistry of the Molten Caustic Leaching Process.
[39] Belov, N.A. and Zolotorevskiy, V.S. (2002) The effect of nickel on the structure, mechanical and casting properties of aluminium alloy of 7075 type, Materials Science Forum, 935-940

The surface chemistry of CSAC was identified through Fourier transform infrared (FTIR) spectrum.
The SEM image clearly showed that the CSAC had a surface structure with well-developed pores.
Similar surface structure had also been observed on the activated carbons produced from coconut shell (CS) and palm kernel shell (PKS) in several studies [14-16].
Comparison of textural properties of various activated carbons Activated carbon BET surface area (m2/g) Total pore volume (cm3/g) Average pore diameter (nm) References Coconut shell (CS) 945.74 0.615 2.94 [14] CS char 702 0.532 [17] CS 995.80 0.449 1.80 [15] CS (physical activation) 1011 0.45 1.87 [18] CS (chemical activation) 953 0.43 1.82 [18] Palm kernel shell (PKS) (physical activation) 584 0.26 1.81 [18] PKS (chemical activation) 1223 0.70 2.29 [18] Empty fruit bunch (EFB) 720 0.341 1.89 [19] CSAC 742.78 0.416 2.24 This work Surface Chemistry.
None or few functional groups were present on the surfaces of activated carbons as shown in Table 2, which indicated that the carbonization and activation processes evaporated the volatile compounds in the raw materials to form porous structures in the activated carbons [15].

Al-Rashdi2, Taha Alqadi3, Mohammed Abdulhakim AlSaadi4, Sam Sung Ting6, Omar S Dahham5, Nik Noriman Zulkepli5,a* 1Department of Chemistry, Faculty of Pharmacy, Qassioun Private University, Damascus, Syria 2Chemistry Department, Umm Al-Qura University, Al-Qunfudah University College, Al-Qunfudah Center for Scientific Research (QCSR), Saudi Arabia 3Department of Biology, Adham University College, Umm Al-Qura University, Saudi Arabia 4National Chair of Materials Science and Metallurgy, University of Nizwa, Sultanate of Oman 5School of Bioprocess Engineering, Universiti Malaysia Perlis (UniMAP), Kompleks Pengajian Jejawi 3, 02600 Arau, Perlis, Malaysia 6Center of Excellence Geopolymer and Green Technology (CEGeoGTech), Faculty of Engineering Technology (FETech), Universiti Malaysia Perlis (UniMAP), Level 1 Block S2, UniCITI Alam Campus, Sungai Chucuh, Padang Besar, 02100, Perlis, Malaysia Corresponding author: aniknoriman@
HNTs have an interesting and extraordinary structure accompanied by a various exterior and interior lumen surface.
Thus, they could be categorised as green analytical chemistry.
Huge amount of applications could be generated from halloysite nanotubes accompanied by unusual meso-structure nano–tubular these applications are adsorbents, tissue engineering, delivery of drug, polymers reinforcement nanotemplates, and enzymatic nanoreactors [13].
The TS enhanced resulting in an augment in the internal friction in the matrix because of the addition of TiO2 nanoparticles, which created a crystalline structure [9].

Chen, Chen, et al. made graphene micro flowers (GMFs) with a highly porous structure to make a material that absorbs microwaves well and has a high completion rate.
The TEM micrographs evidenced the spherical grains having average size of 18 nm whereas, the SAED pattern confirmed the polycrystalline structure and was found to be consistent with the XRD pattern.
C, 10.1039.C6TC01431C–(2016). doi:10.1039/C6TC01431C [2] Zhou, Di; Li, Jing; Pang, Li-Xia; Chen, Guo-Hua; Qi, Ze-Ming; Wang, Da-Wei; Reaney, Ian M, Crystal Structure, Infrared Spectra, and Microwave Dielectric Properties of Temperature-Stable Zircon-Type (Y,Bi)VO4 Solid-Solution Ceramics.
Dielectric materials for applications in microwave communications, Journal of Materials Chemistry, 11(1), (2001).54–62. doi:10.1039/b003681l [4] Zhou, Di; Pang, Li-Xia; Wang, Da-Wei; Reaney, Ian M, BiVO4 based high k microwave dielectric materials: a review.
Journal of Materials Chemistry C, 10.1039.C8TC02260G–(2018). doi:10.1039/C8TC02260G [5] Guo, Huan‐Huan; Zhou, Di; Liu, Wen‐Feng; Pang, Li‐Xia; Wang, Da‐Wei; Su, Jin‐Zhan; Qi, Ze‐Ming, Microwave Dielectric Properties of Temperature‐Stable Zircon‐Type (Bi, Ce)VO4 Solid‐Solution Ceramics.

In our theoretical work, based on ab initio calculation and group theory analysis, we provide a deeper understanding of the features of the electronic structures and the luminescence process of this defect.
In the first part of our paper we present the results of our first principles calculations that reveal the detailed electronic structure of the carbon antisite-vacancy pair (CSiVC) defect and provides reliable working model of the observed single photon emitter for the group theory consideration that can be found in the second part of our paper.
We used such ab initio supercell method that can accurately describe the electronic structure of both the localized point defect and the bulk host crystal and provides good ionization and excitation energies [10,11].
The electronic structure of positively charged CSiVC defect in 4H-SiC and its excitation with the corresponding selection rules.
Thus, the suggested microscopic structure CSiVC is indeed consistent with the previous AB center assignment, however, our calculations indicate that the neutral CSiVC pair does not have visible PL.

Physical Base of the Metallic Gradient Surface Layers of Titanium Alloys Formed under Ion Implantation Irina Kurzina1, 2, а 1 Department of Physical chemistry, Tomsk State University, Tomsk, Russia 2 Department of Nanomaterials & Nanotechnology, Tomsk Polytechnic University, Tomsk, Russia a Kurzina99@mail.ru Keywords: titanium alloys, ion implantation, gradient surface layer, nanostructutes Abstract.
In Fig. 1а, we schematically show the structure of the surface implanted layers of nickel and titanium.
Fig. 1 Schematic representation of the structure of the surface Ion-alloyed layers of titanium implanted with aluminum ions (a).
The defect structure of a material plays an important role in the localization of secondary phases.
In this case the defective structure of borders of grains becomes the most important factor.