J.-X. Dong

New Crystalline Layered Zinc Phosphate with 10-Membered-Ring Channels Perpendicular to Layers

A novel layered zinc phosphate, [N(2)C(6)H(12)](2)[Zn(7)H(3)(HPO(4-x))(5)(PO(4))(3)]H(2)O, with unique 10-membered-ring ellipsoidal channels running perpendicularly to ladder-shaped tetrahedral layers, has been synthesized ionothermally via in situ generation of 1,4-diazabicyclo[2.2.2]octane.

The synthesis and mechanical properties of large zeolite sodalite single crystals

Large zeolite SOD single crystals, of the largest size about 70×70×70μm, were synthesized using a near non-aqueous method. The characterizations of zeolite SOD and synthesis conditions were explained. Their mechanical properties have been measured by instrumented-nano indentation testing that can accurately measure the mechanical properties of small volumes of materials. The load-displacement curve, hardness-displacement curve and modulus-displacement curve of zeolite SOD were obtained. The values of the hardness and the elastic modulus were about 6GPa and 40GPa, respectively. The mechanical properties of zeolite SOD were compared with SiO 2 standard sample.

Hydrolysis of δ-layered sodium disilicate in ions binding process

Abstract In different type water, the hydrolysis of α, β-Na2Si2O5 was investigated near washing clothing concentration by XRD, SEM chemical analysis and residual solid yield. β-Na2Si2O5 changed to kanemite in distilled water. In water with Ca2+ or Mg2+, β-Na2Si2O5 transformed to a mixture of kanemite, Ca(OH)2 and amorphous silicate or a mixture of kanemite (NaHSi2O5 ·3 H2O), Mg(OH)2 and amorphous silicate. α-Na2Si2O5 changed to an unknown phase in distilled water. In water with Ca2+ or Mg2+, α-Na2Si2O5 transformed to a mixture of unknown phase, Ca(OH)2 and amorphous silicate or a mixture of unknown phase, Mg(OH)2 and amorphous silicate. The experimental data showed that the divalent cation binding process of α, β-Na2Si2O5 belongs to a mixture process with divalent cations exchange with Na+ cation and precipitation in form of insoluble amorphous solid.

Preparation and Characterization of Pillared Derivatives from δ-Layered Sodium Disilicate and their Tribological Properties in Liquid Paraffin

Abstract The pillared derivatives from δ-layered sodium disilicate were investigated by intercalation of bisoctyl dimethyl ammonium chloride and dioctadecyl dimethyl ammonium chloride. The influence of various parameters such as water content, pH of the mixture, and time were examined. The resultant samples were characterized by X-ray powder diffraction, Fourier transform infrared, and thermal gravimetric observation. The experimental results showed that δ-layered sodium disilicate was first transformed to kanemite (NaHSi2O4(OH)2 · 2H2O), and subsequently kanemite was pillared with bisoctyl dimethyl ammonium chloride or dioctadecyl dimethyl ammonium chloride. The tribological properties of typical samples then were investigated by point contact test. The results show that the pillared derivatives have good load-carrying capacity and friction-reducing property.

The Synthesis and Properties of High Pure δ Layered Sodium Disilicate

Abstract δ layered sodium disilicate (δ-Na2Si2O5) is a single layer silicate and has good properties as detergent builder. However, it is difficult to synthesize high pure δ-Na2Si2O5. In this paper, a feasible and simple technology was found by decreasing Na content in liquid sodium silicate (water glass). The crystalline time was short and no seed needed. The suitable synthesis conditions were Si/Na = 1.05–1.10, calcining at 720 °C for 5 minutes. The synthesis conditions are of industrial value. XRD and 29Si NMR data proved that synthesized samples were δ-Na2Si2O5 without impure phase. High pure δ-Na2Si2O5 exhibited good ions binding ability and reached 312 to 338 mg CaCO3/g.

Rapid synthesis for mesoporous molecular sieves MCM-41

Abstract A facile method for rapid synthesis of mesoporous molecular sieves MCM-41 has been developed in the present work. After completion mixing of initial raw materials consisting of templating agent, source of silica as well as source of alkali in glycerol solvent at the temperature of 80°C, the mixture obtained was diluted by distilled water at once and filtrated to acquire high-quality mesoporous MCM-41, the obtained products were characterized and analyzed by Nitrogen adsorption-desorption, XRD and SEM technique, which shows the sample have good pore structure and unique morphology characterization.

Synthesis of NON single crystal from HF-SiO2-N,N-dimethyl-piperidine chloride-Et3N system

Nonasil single crystals (200×170×25 μm) with perfect morphology have been successfully synthesized from HF-SiO 2 -N,N-dimethylpiperidine chloride-Et 3 N system. Compared with other methods, NON prepared in this system has larger size and more regular morphology. The NON single crystals were characterized by XRD, SEM, FT-IR, 29 Si NMR spectroscopy. The factors that influence the morphology of NON crystals during the crystallization have been studied. The experiments confirmed that N,N-dimethylpiperidine Chloride was a template for preparing nonasil in a near non-aqueous system.

Interaction between α, β Layered Sodium Disilicate and Surfactants

Abstract This paper investigated the interaction of α-Na2Si2O5 and β-μNa2Si2O5 with surfactants sodium dodecylbenzene sulfonate (LAS), sodium lauryl sulfate (K12), alkyl polyglycol ether-9 (AEO-9) and α-olefin hydrocarbon sulfonate (AOS) under condition approximating the detergent spray drying process. The interaction samples were characterized by XRD and TG. The experimental results showed that α-Na2Si2O5 and β-Na2Si2O5 sustained their phases after interacted with surfactants. The relative crystallinity of α-Na2Si2O5 had little change after interacting with surfactants exception of AOS because it had better adsorbable effect on the surface of α-Na2Si2O5 than LAS, K12 and AEO-9. At the same conditions, the amount of H2O and surfactants were both important factors on the relative crystallinity of β-μNa2Si2O5. It also was proved that the temperature had little influence on the relative crystallinity of both α-Na2Si2O5 and β-Na2Si2O5. Compared with Al-δ-Na2Si2O5, α-Na2Si2O5 and β-μNa2Si2O5 were more stable than Al-δ-Na2Si2O5 after interacted with surfactants.

Synthesis and properties of Al-delta layered sodium disilicate with high framework stability

Abstract Al-δ layered sodium disilicate with high framework stability in hot water (60–80°C) has been successfully synthesized from the system of Na2O–Al2O3–SiO2–H2O. It was shown that the presence of aluminum can improve the purity of δ phase. After marinated in hot distilled water for 60minutes, Al-δ layered sodium disilicate still kept δ phase and had better Ca2+ binding capacity and calcium binding rate. This property of Al-δ layered sodium disilicate may extend its application field. The samples were characterized by XRD, FT-IR, MAS NMR, Ca2+ binding capacity and rate, The data of 27Al MAS NMR and 29Si MAS NMR showed that aluminum was incorporated essentially in tetrahedral framework position, and substitute for SiO4 tetrahedron in sheet of δ layered sodium disilicate.

Synthesis of zeolite ZSM-35 bulk material from aluminosilicate amorphous sinter

Amorphous aluminosilicate sinter may crystallize to zeolite ZSM-35 disc in hydrothermal system of alkalescence. The suitable synthesis conditions were investigated by changing amine type, ethylenediamine/H2O, adding sodium hydroxide, crystallization temperature. The synthesized zeolite ZSM-35 disc may keep the shape of the used sinter. The obtained samples possessed high mechanical intensity up to 1.8×107Pa/m2 which was higher than the uncrystallization amorphous sinter(4.5×106Pa/m2). SEM photo showed that particle size decrease incurred the increase of the force among disc’s particles. So the mechanical intensity was high after crystallization.