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In contact with water, they hydrated and swelled, where their swelling capacity was lowered with increasing the level of crosslink (divinylbenzene) in the copolymer structure.
Since both groups contain hydrophilic hydroxyl groups in the structure, swelling and capillary actions are the two mechanisms most frequently favored to explain tablet disintegration [1].
In addition, it has recently been adopted as a direct compresson filler which displays an obvious disintegrant property due to the presence of hydrophilic carboxyl groups in the structure [3].
Materials and methods Materials: Methacrylic acid (MAA), divinylbenzene (DVB), benzoyl peroxide (Aldrich Chemistry, Germany), microcrystalline cellulose (FMC Corporation, USA.), 95% ethanol (QreC, New Zealand) were used as received.
London: The Royal Society of Chemistry; 1994. 285 p

The phase structure and morphology as-synthesized samples were characterized by XRD, FE-SEM, and UV-vis DRS spectroscopy.
BiVO4 crystal exists in three crystal structure types: monoclinic scheelite (s-m BiVO4), tetragonal zircon (z-t BiVO4) and tetragonal scheelite (s-t BiVO4) structure [4].
The enhanced photocatalytic activity of BiVO4 samples is most probably related to the morphology and structure phase of BiVO4 [4].
Sanchez, Sol-gel chemistry of transition metal oxides, Prog.
Wang, Surfactant-free synthesis of hyperbranched monoclinic bismuth vanadate and its applications in photocatalysis, gas sensing, and lithium-ion batteries, Chemistry (Easton). 14 (2008) 1601–1606

Dedkova, Complexation of lanthanum with a reagent Arsenazo III groups solid phase fibrous ion exchanger, J. of Analytical Chemistry. 60 (2005) 378-383
Marzinkevich and others, Acid-Base and Sorption Properties of New Fiber Exchangers with Groups of Replaced Imidasoline, J. of Appliance Chemistry. 61(1988) 46-50
Mokrishev, Investigation of structure and mechanism of the copper(II) sorption on the ampholyte ANKB-10 by IR- spectroscopy, J. of Analytical Chemistry. 51 (1977) 2499-2502
Andreeva, Complexformating properties of fiber polyampholytes, J. of Applied Chemistry. 64 (1992) 365-370
Selivanova, Separation of cerium-group rare-earth elements on PAN-PHOSPAN fibrous sorbent, Russian J. of Applied Chemistry. 77 (2004) 1757-1760.

The extraction of betulin and ES is complicated by anisotropic capillary-porous structure of the birch bark.
Chemistry and Biological activity, Khimiya v interesakh ustoichivigo razvitiya [Chemistry in the Interests of Sustainable Development Journal], 1-30, (2005)
Chemistry of Plant Raw Materials Journal, 1, (2008)
Semisynthetic derivatives of lupan, Russian Journal of Bioorganic Chemistry, 32 (3), (2006)
Chemistry of Plant Raw Materials Journal, 2 (2005)

This avoids the laborious selfconsistent treatment of electronic structure and transport phenomena simultaneously.
The overlap and Hamiltonian (Fock) matrices of the sub-systems are the electronic structure inputs into Eq. (1), as explained in [7].
These matrices were obtained using the computational chemistry package NWChem [9], with Crenbs effective core potential and basis for gold atoms and allelectron 6-311G basis for all other constituent atoms.
Bernholdt, et al., Parallel computational chemistry made easier: The development of NWChem, Int.
Wells, Computational chemistry for molecular electronics, Computational Materials Science 28, 321-341 (2003).

Some papers report the substitution of elements such as A1, Co, Cr, V, Zn, and Ni at the Mn site, but the structure of the compound remains spinel structure.
The results prove that the powder synthesized by soft chemistry method (coprecipitation method) gets much purer compound than ball-milling method, because all the solid particles may not altogether react resulting in undesirable impurities in the final product.
Fig .5 shows typical spinel structure.
The crystal lattice of B is ’s typical structure which owns spinel structure.
They are similar with the structure of spinel.

Hydration Dehydration Effect on Morphology and Basic strength of Nano-Calcium Oxide Abdul Rahim Yacob 1, a and Nur Fatin Sulaiman 2, b 1 Chemistry Department, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia 2 Chemistry Department, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia a manrahim@kimia.fs.utm.my, b eriqa89@yahoo.com Keywords: Nanostructure CaO, Back titration, Basic strength Abstract.
The prepared nano structured CaO is then studied and chemical characterized.
At 500°C the prepared CaO forms completely to cubic structure.
Yacob, Journal of Physical Chemistry B. 103 (1999) 1944
[6] Yacob, A.R., Asyraf, M.K., Samadi, N.S.: Physical and Basic Strength of Prepared Nano Structured MgO.

Preparation and Characterization of Graphene by the Oxidation Reduction Method Yin Long1, Jianfang Wang1,a,*, Yanan Lv1,2, Cheng-an Tao1, Lin Xia1 and Hui Zhu1 1 Department of Chemistry and Biology, College of Science, National University of Defense Technology, 410073, Changsha, P.
China 2 College of Chemistry and Chemical Engineering, Hunan Normal University, 410081, Changsha, P.
As shown in Fig. 5a, graphite shows a continuous, wrinkled scaly structure; graphene oxide (Fig. 5b) shows a separate sheet structure due to chemical exfoliation, being a stacked state of irregular coverage; graphene (Fig. 5c) is a thin layer with relatively soft edges and folds, which can form curl petal-shaped aggregates.
Graphene is a new type of carbon materials with a two-dimensional honeycomb crystal structure made of closely packed single layer of carbon atoms.
Chemistry of Materials.

A method of preparation of honeycomb monoliths from carbonized rice husk with developed mesoporous structure via modification of the porous structure by silica leaching has been developed.
In accordance with the obtained results, the resulting carbon sorbent has a highly porous structure and a set of cells and voids.
Mansurov, Nanoporous Carbon Sorbent for Molecular_Sieve Chromatography of Lipoprotein Complex.// Russian Journal of Physical Chemistry A, 2011, Vol. 85, No. 6, pp. 1004–1007
Chemistry and chemical technology.Modern Problems.

SI-8210 Trebnje, Slovenia 2 Civil and Geodetic Faculty, University of Ljubljana SI-1000 Ljubljana, Slovenia 3 Department of Chemical Engineering, Faculty of Chemistry and Chemical Technology University of Ljubljana, SI-1000 Ljubljana, Slovenia ablaz.skubic@trimo.si, bmitja.lakner@fgg.uni-lj.si, cigor.plazl@fkkt.uni-lj.si Keywords: Expanded Perlite; High Temperature Treatment; Sintering.
The industrial technology was developed in cooperation between company Trimo d.d. and Faculty of chemistry and chemical technology Ljubljana and among others includes mixing of raw materials, molding, microwave drying and high temperature treatment of the dried board.
Water inside the ore produces steam, and this forms bubbles within the softened rock to produce a frothy-like structure [3].
The use of sodium silicate binder, which is the most common in this type of board production and drying the product at temperatures below the phase change temperature of amorphous sodium silicate to its crystal structures, demands the use of different additives to ensure the long-time stability of the board, especially if exposed to moisture.