catena-Poly[[[pyridinecopper(II)]-(μ-2-oxidonaphthalene-1-carbaldehyde pico­linoylhydrazonato)-[pyridinecopper(II)]-μ-sulfato] diethyl ether hemisolvate]

The title compound, {[Cu2(C17H11N3O)(SO4)(C5H5N)2]·0.5C4H10O}n, was syn­thesized by the reaction of 2-hydr­oxy-1-naphthyl­aldehyde-2-pyridine­carboxyl­hydrazone with copper sulfonate. A one-dimensional polymer was obtained via self-assembly. Each Cu ion is located in a distorted square-pyramidal coordination environment, with one Cu ion coordinated by two N and three O atoms, while the other links to two O and three N atoms. In the crystal, weak inter­molecular C—H⋯O inter­actions connect the chains into a two-dimensional network

THERMODYNAMIC ANALYSIS OF ROTARY CONTROL HEAD LUBRICATION AND COOLING SYSTEM

According to the requirements of the CBM special rotary control head lubrication and cooling system and combined with the existing mature rotary control head lubrication cooling technology,this paper designed a structure without cooling and lubricating pump station plugins. In order to ensure the structure satisfies the lubrication and cooling requirements of the rotary control head sealing system and bearing group,this paper applied the finite element analysis software and indoor experiment to carry out the thermodynamic analysis on the rotary control head lubrication and cooling system. The results show that the lubrication and cooling system meets the design requirements. The upper stabilizing bearing temperature is highest which is 71. 9 ℃ while the highest temperature of the dynamic seal assembly is 60℃. In addition,eccentricity,sealing pressure and rotating speed have greater impact on the lubrication and cooling system,the system temperature changes with the above three factors similarly to a linear change

Model for the Synthesis of Self-Assembling Template-Free Porous Organosilicas

High surface area solids are important materials in science and in many industrial applications but often are produced from expensive and inefficient combinations of materials and processes. New principles for the selection of molecular precursors that yield high surface area solids in simple and efficient sol–gel processes would be useful. Focusing on organosilicas, we show that an index based on rigidity theory can be used to quantify the relative strength of the gel and the level of condensation at which it is able to withstand the capillary stresses imposed by drying, thereby preventing loss of surface area. This index correctly orders precursors according to the surface area of the solid materials produced from them and provides, when correlated to a few data points, a predictive relationship between the index and the surface area. Precursor features leading to early formation of a highly connected rigid network include high ratios of nonhydrolyzing (e.g., methylene) to hydrolyzing (e.g., oxy) groups bridging silicate moieties, large SiOH/Si ratios in the hydrolyzed precursors, and low numbers of noncondensing terminal groups (e.g., methyl). These features explain the extremely high surface areas obtained from 1,1,3,3,5,5-hexaethoxy-1,3,5-trisilacyclohexane and high surface areas obtained by similar materials in aqueous, nontemplated syntheses, as shown in a related publication (DOI: 10.1021/acs.chemmater.7b04480)

One Step Facile Synthesis of Amine-Functionalized COF‑1 with Enhanced Hydrostability

One Step Facile Synthesis of Amine-Functionalized COF‑1 with Enhanced Hydrostabilit