Results 21 to 30 of about 2,477 (226)

Invertible substitutions and local isomorphisms

Comptes Rendus. Mathématique, 2002
Let ϕ1 and ϕ2 be two primitive invertible substitutions over a two-letter alphabet. Let ξϕ1 and ξϕ2 be fixed points of ϕ1 and ϕ2, respectively. We show that ξϕ1 and ξϕ2 are locally isomorphic if and only if there exists a primitive invertible substitution ϕ0 and two positive integers m and n such that Mϕ1=Mϕ0m and Mϕ2=Mϕ0n, where Mϕ is the substitutive
Wen, Zhixiong, Wen, Zhiying, Wu, Jun
openaire   +1 more source

Change of Structural and Adsorption Properties Due to Isomorphous Substitution in Hydrotalcite-like Materials

Adsorption Science & Technology, 2002
Samples of hydrotalcite-like compounds with the general formula [M 2+ 1-x M 3+ x (OH) 2 ] x+ •A x– •nH 2 O were prepared via coprecipitation through the addition of NaOH to mixed chloride salt solutions. On maintaining the M 2+ /M 3+ ratio equal to three,
Gamal M.S. El Shafei
doaj   +1 more source

Strengthening Intraframework Interaction within Flexible MOFs Demonstrates Simultaneous Sieving Acetylene from Ethylene and Carbon Dioxide

Advanced Science, 2023
Efficient separation of acetylene (C2H2)/ethylene (C2H4) and acetylene/carbon dioxide (CO2) by adsorption is an industrially promising process, but adsorbents capable of simultaneously capturing trace acetylene from ethylene and carbon dioxide are scarce.
Fang Zheng, Rundao Chen, Ying Liu, Qiwei Yang, Zhiguo Zhang, Yiwen Yang, Qilong Ren, Zongbi Bao   +7 more
doaj   +1 more source

Isomorphous Substitution of P(V) in Natural Clinoptilolite: Evalution of the Product for Removal of NO3-, NO2- and F - from Aqueous Solutions [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2008
Nitrate is an anion of major importance particularly in biological areas. Excessive amounts in water supplies indicate pollution from sewage or agricultural effluents. The effects of excessive quantities of nitrate in water are well known.
Hossein Faghihian, Mohammad Hadi Mohammadi   +1 more
doaj  

Incidental Polymorphism, Non-Isomorphic and Isomorphic Substitution in Calcium-Valine Coordination Polymers

Crystals, 2015
Five coordination polymers with the stoichiometry CaX2(valine)2(H2O)2 (X = Cl, Br) were obtained from the corresponding calcium halides and either racemic and enantiopure valine. In all cases the zwitterionic amino acid is exclusively O coordinated and the halides act as counteranions for the resulting one-dimensional cationic chains.
Lamberts, Kevin, Englert, Ulli
openaire   +4 more sources

Design and Evaluation of Pegylated Large 3D Pore Ferrisilicate as a Potential Insulin Protein Therapy to Treat Diabetic Mellitus

Pharmaceutics, 2023
An iron-based SBA-16 mesoporous silica (ferrisilicate) with a large surface area and three-dimensional (3D) pores is explored as a potential insulin delivery vehicle with improved encapsulation and loading efficiency. Fe was incorporated into a framework
B. Rabindran Jermy, Mohammed Salahuddin, Gazali Tanimu, Hatim Dafalla, Sarah Almofty, Vijaya Ravinayagam   +5 more
doaj   +1 more source

Fate of nickel ion in (II-III) hydroxysulphate green rust synthesized by precipitation and coprecipitation Adsorção de íon níquel em (II-III) green rust hidroxisulfato sintetizado por precipitação e co-precipitação

Revista Brasileira de Ciência do Solo, 2007
In order to investigate the efficiency of sulfate green rust (GR2) to remove Ni from solution, GR2 samples were synthesized under controlled laboratory conditions.
Lucia Helena Garófalo Chaves, Joan Elizabeth Curry, David Andrew Stone, Jon Chorover   +3 more
doaj   +1 more source

Nickel incorporation in Fe(II, III) hydroxysulfate Green Rust: effect on crystal lattice spacing and oxidation products Incorporação de níquel em Fe (II-III) Grenn Rust hidroxisulfato: efeito sobre a estrutura cristalina e produtos de oxidação

Revista Brasileira de Ciência do Solo, 2009
Ni(II)-Fe(II)-Fe(III) layered double hydroxides (LDH) or Ni-containing sulfate green rust (GR2) samples were prepared from Ni(II), Fe(II) and Fe(III) sulfate salts and analyzed with X ray diffraction.
Lucia Helena Garófalo Chaves, Joan Elizabeth Curry, David Andrew Stone, Michael D. Carducci, Jon Chorover   +4 more
doaj   +1 more source

Enhancement of Photocatalytic Activity and Microstructural Growth of Cobalt-Substituted Ba_1−xCo_xTiO₃ {x = 0, …, 1} Heterostructure

ChemEngineering, 2023
The photocatalytic degradation process and absorption kinetics of the aqueous solution of the Cibacron Brilliant Yellow 3G-P dye (Y) were investigated under UV-Vis light. Pure barium titanate BaTiO3 (BT) and cobalt ion-substituted barium Ba1−xCoxTiO3 (x =
Sana Jebali, Mahdi Meftah, Chadha Mejri, Abdesslem Ben Haj Amara, Walid Oueslati   +4 more
doaj   +1 more source

Caracterização de óxidos de ferro de solos do ambiente tabuleiros costeiros Characterizing iron oxides from coastal and central plain soils

Revista Brasileira de Ciência do Solo, 2008
Vários têm sido os trabalhos contemplando a gênese e as conseqüências da coesão em Argissolos e Latossolos nos tabuleiros costeiros e interioranos.
Marcelo Metri Correa, João Carlos Ker, Vidal Barrón, Maurício Paulo Ferreira Fontes, José Torrent, Nilton Curi   +5 more
doaj   +1 more source