Search results

The Optimization of Ultrasonic Extraction for Benzoic Acid Determination in Curry Paste Samples by Using UV-Visible Spectrophotometry Nararat Thongsrinoon1,a*, Patcharida Naun-Ong1 and Yuwalita Ketyothin1 1Chemistry and Applied Chemistry Program, Faculty of Science and Technology, Songkhla Rajabhat University, Thailand atnararat@yahoo.com Keywords: benzoic acid, curry paste, ultrasonic extraction, UV-Visible spectrophotometry Abstract.
In addition, ultrasonic extraction is a key sample preparation step in achieving the objective of sustainable green chemistry [8].
According to the structure of benzoic acid consisting of a large, non-polar benzene ring attached to a small, polar carboxylic acid functional group and its physical property which is slightly soluble in water, benzoic acid is slightly polar.
Acknowledgements The authors gratefully acknowledge the financial support of the Chemistry and Applied Chemistry Program, Faculty of Science and Technology, Songkhla Rajabhat University, Thailand.

With advantages such as long cycle life, fast charge-discharge rate and stable structure during charge-discharge, it is used as a high-power lithium battery with long cycle life [20~22].
Chemistry of Materials, 2012, 24(17): 3329-3334
Journal of Energy Chemistry, 2021, 56(38): 383-390
Journal of Solid State Chemistry, 2021, 303(09): 453-460
ACS Sustainable Chemistry & Engineering, 2018, 7(1): 916-924

Tribological Behavior and Surface Chemistry Characteristics of Quasicrystal Coatings B.
Introduction Due to their unique atomic structure, quasicrystals have attracted considerable interest since being first reported in Al-Mn alloy by Schechtman et al [1].

Mesoporous aerogels synthesized with an ionic liquid [Hmim]Br as template via ambient pressure drying Hongyi Dai1,a, Hairui Yan1,b, Chunling Yu*,1,c, Yinghuan Fu1,d, Guolin Shao1,e, Liyuan Ning1,f and Xuyang Wu1,g 1School of Light Industry & Chemistry Engineering, Dalian Polytechnic University, Dalian, Liaoning,116034, P.R.
This is a significant advantage of the present method, providing a broader range of available gel structures.
It can be seen that in both cases, porous structures were obtained.
The effection of IL on the gel structure and gel times may be a physical behavior.
Vollet: Journal of Physical Chemistry.

Structural Anlaysis To ensure that the role does not cause fatal damage,the elastomer material selected paper materials;warheads selected blunt Ministry of rubber or plastic bullet;machine contained riot shell and launch systems;the total weight of the UAV should be less than the maximum load; riot shell fired disturbance should not be too large,need to meet the flight stability index.This article summed up the experience in rocket design standards based on shell-shaped[2],combined with the practical requirements of the riot of rockets,select cylindrical Ministry airframe outer diameter of 23mm,inner diameter of 20mm,its shell-shaped structure shown in Fig.1 mainly by the warhead,mixing Pharmacy,cartridge,rocket engines and other components. 1 – Warhead 2 - mix of chemicals 3- cartridge 4- Engine Fig.1 Small UAV riot shell chart Rocket Engine A．The shell design 1)Shell thickness:Riot rockets with a crushing performance,the formation of the Fengrui fragments of paper shell material
Conclusion (1) According to the rocket launch technology,the engine structure of the small UAV riot shell is designed and simulated.
(2)Based on security design principles,the main components use paper materials.The overall structure don’t be applied with metal parts,which never produces lethal Fragments after the explosion and achieves the non-lethal purpose for the crowd
[7] Fu-ya Zhu.Rocket structure and function [M].Beijing:National Defence Industry Press.2005. 9:8-21,26-42
[8] Akhavan J.The chemistry of explosives[M].2nd ed.Cambridge.UK:The Royal Society of Chemistry.2004

The grain boundary structure differs from that of the bulk crystal.
For successful production of an optimised structure, new processes have to be adopted based on a detailed knowledge of the behaviour of individual grain boundaries.
Because this effect has also been described for many other processes and equilibrium states caused by changing reaction conditions (reaction agents, structures etc.) in chemistry, biology, biochemistry, pharmacology, biomedicine, food systems, physics and material science [7], it seems to have a general nature.
Compensation effect in grain boundary migration It is apparent from Table 1 that the values of both the activation enthalpy and the pre-exponential factor of grain boundary migration vary with changing interfacial structure (energy).
The fact that a similar effect is observed in a wide spectrum of processes in chemistry, biology, biochemistry, pharmacology, biomedicine, food systems, physics, material science and other very distinct fields implies that there should be a thermodynamic nature to this phenomenon.

Introduction Over the past few decades, a considerable number of studies on the durability design for marine concrete structures have been carried out.
Chloride diffusivity depends on (a) water diffusivity, (b) pore structures, (c) tortuosity, (d) hindrance effect, and so on.
Bazant: Physical Model for Steel Corrosion in Concrete Sea Structure - Application, Journal of Structure, Div., ASCE, No.105, Vol.6 (1979) p.1137-1153
Astle (Eds.): CRC Handbook of Chemistry and Physics (1982), CRC Press, Boca Raton, p.299, FL, F-154
Pelizzetti: Chemistry of Marine Water and Sediments, Springer (2002) [6] K. van Breugel: Simulation of Hydration and Formation of Structures in Hardening Cement-Based Materials (1991) Ph.D Dissertation, TU Delft, The Netherlands

Introduction Structure-properties relationships of functional materials [1-10] may be improved by a wide array of processing routes [1, 11-29].
DSC confirmed the glassy structure of the matrix.
Mangiorou, Atomic topology and electronic structure of a melt-spun Al92U8 metallic glass, Computational and Theoretical Chemistry, 1036 (2014) 16-21
Karalis, The effect of annealing on the electronic stability of an amorphous Zr70Pd30 alloy, Materials Chemistry and Physics, In press (2014)
Xenidis, A containerless study of short-range order in high-temperature Fe–Si–Al–Ca–Mg–Cr–Cu–Ni oxide systems, Journal of Molecular Structure, 1019 (2012) 151-158

The phase and crystal structure were identified by using a X-ray diffraction analyzer (Model PW 1830 Generator, Philips and PW 3210 MPD control, Philips).
Almost identical microstructure was observed for YIG sample and the individual particles seem to be homogenous crystals structure with grains sizes below 1 µm.
Most of the particles stuck to each other in a regular and uniform manner to form a network-like structure.
Crouch, Fundamentals of Analytical Chemistry, Brooks/Cole, 2004
Kitagawa, “The Relationship Between The Magnetic Moment of Metal Atom and Its Catalytic Activity”, The Review of Physical Chemistry of Japan, vol. 11f No. 2, 1937.

Bamboo is one kind of functionally gradient fiber reinforced composite and the excellent mechanical properties are attributed to the multiscale hierarchical structures and the robust fibers [6, 7].
Wang [11] et al prepared fibrous monolithic Si3N4/BN composite imitating the structure of bamboo with a high toughness of more than 20 MPa·m1/2 and a work of fracture of 4000 J/m2.
The special multisalce structure and the toughening mechanism of bamboo have become a promising resource for novel building materials and structures.
Engineering Structure Vol.24 (2002), p.429
Materials Chemistry and Physics Vol.45 (1996), p.114