Search results

Besides, the influences of the alkyl-substitution position on the molecular structure, polymerization process, morphology and electrical properties are also discussed.
Moreover, the alkyl substitution strongly affects the polymerization process, molecular structure, morphology and conductivity of the derivatives.
Wei, Core-shell structured and electro-magnetic functionalized polyaniline, Synthetic Metals 6 (2007) 575-579
Chen, Electro-magnetic functionalized and core-shell micro/nanostructured polypyrrole composites, The Journal of Physical Chemistry B 110 (2006) 14623~14626
Ko, Structures and properties of chemically reduced polyanilines, Polymer 39 (1998) 1187-1195

New compound TiCu exists upon TiC layer shown in Fig.3 and the arrows point towards TiCu that grows into a white alveolate structure.
These white alveolate structures can be found frequently in the Ag-Cu-Ti filler metal.
Under the white alveolate structure TiCu layer, gray TiC layer exists.
(3) New compound TiCu layer appears white alveolate structure and grows near TiC layer. too muchTiC, TiCu could result in joint crack.
Tsai : Materials Chemistry and Physics Vol. 84, No. 2-3 (2004), p. 251-258 [7] Y.

It is a clay mineral with a fibrous consistency and a phyllosilicate 2:1 that features continuous octahedral sheets in only one dimension (forming strips that resemble the structure in a pyroxene and amphibole chain).
This organization results in a porous structure whose channels contain exchangeable cations and water molecules [3].
Results and discussions The sulfur analysis showed the incorporation of 9.73 ± 0.36 mmol g-1 of the organic groups in the structure of the palygorskite, thereby confirming that a good quantity of the organic groups were incorporated.
This strengthens the confirmation of the incorporation of organic groups in the structure of the natural palygorskite.
The modification occurred in the absence of a solvent, which follows the principles of green chemistry, by a simple and effective system that is an available material useful for various applications.

But at the moment, physical structure of organic inorganic composite scaffolds are mostly at the micron level.
As shown in Fig.1(a, c), composite scaffold prepared with porogen is size hole through the network structure of matrix, and without porogen is relatively dense without a big hole appeared.
Further to see in the fig.2(d), SEM at high magnification, the composite scaffold has no fiber network structure.
This is mainly due to the weak layer crystalline structure formed on the surface of composite scaffold and polymer matrices degraded somewhat in SBF solution.
And in 1400 ~1460cm-1 place, splited into two absorption peaks, respectively, 1454 and 1418 cm-1, is different from the free radicals CO32- or ν3 unimodal of CO32- of carbonate in argument, is an important symbol of CO32- into the carbonate-apatite structure.

A copolymerization modified acrylate resin and its polyhedral oligomeric silsesquioxane composites Xiaolan Hua, Xi Lanb, Tengfei Luc, Hongshan Yangd, Yinglai Yange College of Materials, College of Chemistry and Chemical Engineering, Xiamen, Fujian 361005 China axlhu@xmu.edu.cn, b2008lanxi22@163.com, clu.tengfn1987@163.com, ddestiny10009@126.com egoatduoli@gmail.com Keywords: acrylate copolymer, polyhedral oligomeric silsesquioxane, nanocomposites Abstract.
For its special structure, POSS can be easily incorporated into polymeric matrices to prepare novel polymer matrix composites by physical blending or chemical copolymerization [5-8].
The chemical structure of epoxy resin is shown in Figure 1.
Octalsobutyl polyhedral octameric silsesquioxane (Octalsobutyl POSS) and aminoisobutyl polyhedral octameric silsesquioxane (aminopropyllsobutyl POSS) were purchased from Hybrid Plastics, Inc., and their chemical structures are shown in Figure 2.
Fig.1 Chemical structure of epoxy resin Fig.2 Chemical structure of octalsobutyl POSS and aminopropyllsobutyl POSS Added quantitative BA, HEMA, and MAA into mixture of diacetone alcohol and n-butyl alcohol for 5 min at 100 ºC, then dropwise added benzoperoxide diacetone alcohol solution into the former mixture in 1 hour, stirring moderately for 3 hours at 100 ºC, named as acrylate resin A.

Here we report the mesoporous silica materials are synthesized in the presence of assembled cationic surfactant micelle templates,which serve as structure-directing agents for polymerizing silica component by electrostatic interaction,and describe the adsorption of metoprolol tartrate (b-blocker, applied in hypertension [2]) on the non-modified MCM-41.
The synthesized MCM-41 sample presented three Bragg peaks, which can be indexed as (1 0 0), (1 1 0) and (2 0 0) belonging to characteristic diffraction peaks of a typical regular two-dimensional hexagonal structure.
This shows that after metoprolol tartate was encapsulated in MCM-41, the metoprolol tartate did not destroy the MCM-41 channel mesoporous structure but its surface area was lowered.
Tab 1 Pore structure parameters of samples sample Pore diameter(nm) Surface area (m2/g) Pore volume(cc/g) MCM-41 3.380 1110.83 1.110 MPT/MCM-41 2.886 769.356 0.630 Fig3 (a)(b)TEM micrographs of MCM-41 Fig4 .
Chemistry of materials, 2001, 13(2): 258-263.

Combined with vacuum packing or nitrogen inflator, products have met with potato chips taste and the quality and structure, and the salt content was lower than those of other dry meat, long shelf life
Lyophilization was conducted in the frozen state, in the process of freeze-drying ,the physical form , chemical and biological properties, solid skeleton basic remain unchanged after dehydration, and can form porous sponge structure, swear, having the ideal instant and fast after water.
When the temperature reaches a certain critical value, the rigidity is not enough to sustain cellular structure, hole will collapse, the original steam diffusion channels are closed, the temperature is collapse temperature, namely the highest limit temperature sublimation interface.
By combining single factor experiment with the theory of heat and mass transfer analysis, to compare products quality and structure, flavor, after water, deciding the factors that affect the drying rate, material shrinkage and material recovery value index of the water.
Effective freeze - drying: a combination of physics, chemistry, engineering and economics [J].

Recently, synthesis technology of ultra-fine nano-structured materials can be attained by utilizing ultrasonic radiation because it is able to provide high frequency clean energy to prevent the agglomeration [4].
Effects of sonication supplied during precipitation process on physical structures of SnO2 nanoparticles were analysed and involved mechanisms are proposed.
The size,shape and crystal structure of as-synthesized SnO2 nanoparticles were observed by TEM (FEI, TECNAI G220) operated at 200 kV.
All diffraction peaks of SnO2 nanoparticles prepared with/without sonicationevidently reveal polycrystalline phase of tetragonal SnO2 crystal structure [7].
Sedghi, Synthesis of SnO2 nanopowders by a sol-gel process using proponol-isopropanol mixture, Central European Journal of Chemistry, 6(4), (2008)651-656.

First, we prepared a stable 10-mer poly(A)-poly(T) DNA structure in the water solvent, before the full-scale simulation.
Next, we appended a Mg2+ ion in the vicinity of the structure obtained in the first step, and ran minimization and short equilibration.
DNA structure with solvatecap (a) full size, (b) zoom in QM region.
In the result of MM method, molecular structure fluctuated temporarily, but major changes were not observed.
Watanabe, Radiation Chemistry.

The chemical structure of curcumin as shown in Fig. 1.
Fig. 1 The chemical structure of curcumin Curcumin Prodrugs According to the different carriers, curcumin prodrugs might be classified as below: polyethylene glycol (PEG) loading prodrug; cholesterol loading prodrug; surfactant like amphiphilic loading prodrug, and curcumin-amino acid bioconjugates.
The chemical structure of 1-7 as shown in Fig. 2.
Fig. 2 The chemical structure of compound 1-7 Summary Owing to the unique polyphenolic structure providing appropriate binding site of carriers, curcumin is specially suitable for the modification of prodrug.
Bioorganic & Medicinal Chemistry 13 (2005) 1477–1486.