Search results

The results showed that: when the polyelectrolyte ionic group has strong high molecular weight, high charge density and linear structure, colloidal titration in anionic and cationic polyelectrolyte could maintain the relationship of charge measured very well.
Chemistry and Technology of Emulsion Polymerization(CRC Press, U.S 2005).

Fig 1 A few of typical structure of the geopolymers The above structure of the geopolymer is both different from the cement paste, and also different from the ceramic, it is a kind of material having a continuous three-dimensional network architecture and in "tactoid state" or "glassy state".
Relatively pure crystal structure.
Cage-like cavity structure of geopolymer could be used to isolate metal ions from other toxic and hazardous compounds and surround it in the cavity, even the aluminum ions in framework could be used to adsorb metal ions or to participate in the formation of the structure, therefore, it can be widely used for solid closure of heavy metal ion [20].
Davidovits, in: Geopolymer chemistry and applications(National defence industry press, Beijing 2011) [6] WU Jing, in: Status on new geopolymer based building materials(Wuhan University of Technology, Wuhan)
[14] J Davidovits, in: Method for bonding fiber reinforcement on concrete and steel structures and resultant products, USP.

For applications in 5these fields, β-Si3N4 with a relatively stable structure and high thermal conductivity is an ideal material.
The excessive growth of crystals will introduce a large number of defects in the crystal structure of Si3N4 ceramics.
The crystal structure and lattice parameters of α-Si3N4 and β-Si3N4 are shown in Fig.2 and Table 1.
The short-range movement of silicon and nitrogen changes the crystal structure of Si3N4 grains composed of SiN4 tetrahedrons, and promotes the transformation of Si3N4 α→β phase.
Ruhle, Influence of secondary phase chemistry on grain-boundary film thickness in silicon-nitride, Z.

With the polymers invented by chemistry scientists, the mankind was exposed to an opportunity to make and use in practice the materials possessing really unique properties – durability, the elasticity, high strength, operational in combination with their being light-weight enough for the manufacture of easily mountable products.
Therefore, they are more capable of resisting wind loads that tend to occur in particular on top of high-rise structures.
Profiled window structures made of fiberglass plastic serve much longer than PVC profiled window structures.
Mechanical safety (for structures). 2.
Children and school buildings, medical care institutions and other type of buildings of the group “A”; non-residential buildings and structures of groups “B”, “C” and “D”; support structures: subways, platform and etc.).

Organic pollutants are readily broken down in nature because of their simple structures and high hydrophobicity.
The main advanced oxidation process highlighted in this section, Fenton's chemistry, operates under ambient conditions (belonging to the class of AOPs). 3 – Fenton Process The Fenton's process, shown in Figure 2, was initially described in 1894 after it was discovered that the oxidation of tartaric acid by hydrogen peroxide is much enhanced in the presence of ferrous ion.
The cyclic reactions of Fenton chemistry, which occur in air, can be mathematically represented.

On mixing dissolution/precipitation reactions occur, which results in the formation of a geopolymer structure[2].
In addition to the shrinking, cracking, chemical reactions, such as decomposition and crystallization, also greatly affect the pore structure.
It is well known that strength greatly depends on pore structure[11].
WU: Research Journal of Chemistry and Environment, Vol. 17 (2013) No.2, p.223.
Mirza: Materials and Structures.

Narsu1,d* 1College of Physics and Electronic Information, Inner Mongolia Key Lab for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Hohhot 010022, China.
B.Narsu et al conducted first-principles calculations on the crystal structure, mechanical properties, and mechanical performance of (FeMn)2P1-xTx (T=Ge, Si) compounds[15-16].
Models and Calculation Methods  (a) (b) Fig.1 Structure models of FeMnPSi compounds (a) Original cell structure model (b) super cell structure The crystal structure of FeMnP0.67Si0.33 is the hexagonal Fe2P structure and and the space group is Pm.
To calculate the crystal cell structure containing point defects, a 2×2×2 supercell with 72 atoms was constructed, as shown in Figure 1(b).
According to the thermodynamics, when formation enthalpy is lower, the crystal structure is more stable.

The Synthesis and Bioactivities of 2-Hydroxyethyl Benzo[d] isothiazole-3(2H)-one Marine Antifouling Paints Jianxin Yang1,a*, Chenghang You1,b, Xianghui Wang2,c, Qiang Lin2,d 1Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou, Hainan Province, China 2College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, China ayangjxmail@sohu.com, b365137126@qq.com, c420091108@qq.com, dlinqianggroup@163.com Keywords: Benzo[d]isothiazole-3(2H)-one; Aromatic acid esters; Antibacterial; Antifouling Paints Abstract.
Twenty-one novel compounds were synthesized from the benzo[d]isothiazole-3(2H)-one and aromatic acid, the structures were identified by means of 1H NMR, IR, EA.
It is considered that the anti-fungal activity can be improved by modified the hydroxyl group in the structure of the 2-hydroxyethyl benzo[d]isothiazole-3(2H).
It’s probably that the introduction of a methyl or a methoxy attached to the structure may be improve the inhibition of against resistant strains, which provided us some ideas for the research and application of benzisothiazoles.
Conclusion In this paper, a type of benzo[d]isothiazole-3(2H)-one derivatives containing hydroxyethyl moiety were synthesised by two-step reaction, the structure of the synthesized compound was confirmed by 1H NMR, IR, EA.

Svante Arrhenius, a Swedish chemist and Nobel Laureate in Chemistry, pointed out that carbon dioxide generated each year from burning coal would result in a slight increase in earth temperature; but long-term accumulation would exert a significant impact.
The harmful substances released from it affect its surrounding waters, air quality and sometimes even social structure.

Piston Stroke Design Optimization for Linear Compressor Huiming Zou 1,a, Liqin Zhang 1,2,b, Guohong Peng 1,2,c, Changqing Tian 1,d 1 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P.
Compact structure and higher efficiency are the two main advantages of the linear compressor for there are no need for the conversion mechanism and no sideways force on the piston.