反应条件对氮(碳/氧)化硅薄膜性能的影响

就氮(碳／氧)化硅薄膜的反应条件——组成和结构——性能之间关系的国内外研究进行了综述。     

Properties of Heat-Insulating Materials (A Review)

Heat-insulating materials for the lining of aluminum electrolysis cells based on diatomite, vermiculite, perlite, and calcium silicate are briefly reviewed. Data on heat conductivity of these materials over the range of 200 – 800°C are given, with emphasis placed on the behavior in the electrolysis bath. Properties of heat-insulating materials available from domestic and foreign manufacturers are discussed in terms of the classification temperature and safe operating temperature. __________ Translated from Novye Ogneupory, No. 3, pp. 18 – 22, March, 2005. From materials submitted to the 4th International Seminar “Refractories for the aluminum industry.”     

氮化铝纳米线的气–固法制备及光学性能

以三氯化铝和叠氮化钠为原料,用复分解反应制备单晶氮化铝（AlN）纳米线。样品呈灰白色粉末,反应温度为650℃,反应时间为3h,并对该样品进行X射线衍射、透射电镜和选区电子衍射测试分析。结果表明：样品为六方相氮化铝且为表面光滑的长直形圆柱状,直径为50nm左右,长度均在10μm以上,晶格常数分别为a=0.268nm、c=...     

Ceramic Materials for Milling Bodies (A Review)

The parameters of over 40 various types of milling bodies developed or manufactured by domestic and foreign manufacturers are analyzed. It is established that the wear resistance of ceramics depends on two groups of factors: external ones (process characteristics, design specifics of milling machines, shape and size of milling bodies) and internal ones (structure parameters, composition and properties of materials). The structure of ceramics has a deciding effect on the wear resistance of materials of the same type. Wear resistance can be increased by increasing the corundum content in the mixtures or by controlling the microstructure of ceramics by introducing modifying additives. Additives of eutectic compositions are the most promising.     

Thermophysical Properties of NZP Ceramics (A Review)

Data on the thermophysical properties of NZP ceramics with the NaZr₂(PO₄)₃-type structure are summarized. A system of thermal expansion regularities is proposed making it possible to predict NZP materials with controllable thermal expansion, including ultralow expansion with near-zero anisotropy. The thermodynamic functions of the reactions of synthesis of NZP phosphates are calculated and the applicability of ceramic technology is justified. It is proposed to use NZP ceramics as heat-insulating materials capable of working under abrupt temperature shifts.     

工程材料复习思考（上）

根据本教研室实际教学情况,用科学方法论的思维对教材前五章做了较为系统的分析,使学生在繁琐的知识点中把握本课程最本质、最重要的内容。取得初步效果。     

Mechanical Properties and Contact Damage Behavior in Aligned Silicon Nitride Materials

Aligned Si₃N₄ microstructures were achieved by seeding, extruding, and laminating methods. The degree of grain alignment was determined by microstructural measurements. Mechanical properties, including toughness, strength, hardness, and elastic modulus, as well as the contact damage response, were addressed and discussed as a function of this anisotropic microstructure. K _{I C} values over 8 MPa·m^1/2 and strengths above 900 MPa were achieved for the most favorable planes in the textured material. Contact damage behavior was influenced by grain orientation in two ways, first, by conferring elliptical shape to the radial surface cracks and second, by the multiple twin/slip formation at the large seeds within the high shear strain region.     

Microstructure and Mechanical Properties of Silicon Nitride Materials Fabricated from SHS Powders

Two different silicon nitride powders, one produced by self-propagating high-temperature synthesis (SHS) and one commercial, have been equally processed to obtain dense materials. Y₂O₃ powders as a sintering aid and hot-pressing techniques were used to process the materials. The fracture toughness and strength of the materials prepared have been evaluated and the results comparatively discussed as a function of the microstructure, with special emphasis on the characteristics of the initial powders.     

Polylactide (PLA)-Based Electrospun Fibrous Materials Containing Ionic Drugs as Wound Dressing Materials: A Review

The effect of the electrospinning process parameters on the morphology, alignment, and self-organization of the fibers into bundles and/or yarns are outlined. The fabrication of polylactide materials containing ionic drugs by electrospinning is emphasized. The main approaches used for the preparation of electrospun drug-loaded materials: electrospinning of a mixed solution containing the polymer(s) and the drug(s) or dual spinneret electrospinning of separate drug-containing solutions are compared. The latter approach allows the obtaining of drug-loaded fibrous materials while avoiding the drug interaction. The potential application of the obtained materials containing ionic drugs as wound dressings is outlined.     

Synthesis of Aluminum Nitride/Boron Nitride Composite Materials

Aluminum nitride/boron nitride composite was synthesized by using boric acid, urea, and aluminum chloride (or aluminum lactate) as the starting compounds. The starting materials were dissolved in water and mixed homogeneously. Ammonolysis of this aqueous solution resulted in the formation of a precomposite gel, which converted into the aluminum nitride/boron nitride composite on further heat treatment. Characterization of both the precomposite and the composite powders included powder X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. Analysis of the composite revealed that the aluminum nitride phase had a hexagonal structure, and the boron nitride phase a turbostratic structures.     

Methods for Improving Optical Parameters of Float Glass (A Review)

The effect of the processes of discharge and spreading of glass melt in the melt tank on optical parameters of float glass is considered. The existent design and technological solutions for leveling the temperature gradient in melted glass flow, which is one of the main factors in the formation of optical distortions, are described.     

Porous Materials for Oil Spill Cleanup: A Review of Synthesis and Absorbing Properties

This paper reviews the synthesis and the absorbing properties of the wide variety of porous sorbent materials that have been studied for application in the removal of organics, particularly in the area of oil spill cleanup. The discussion is especially focused on hydrophobic silica aerogels, zeolites, organoclays and natural sorbents many of which have been demonstrated to exhibit (or show potential to exhibit) excellent oil absorption properties. The areas for further development of some of these materials are identified.     

邻菲啰啉-白炭黑复合材料的制备与光学性质研究

本文首先将白炭黑与氢氧化钠反应进行活化,再将0.0520 g邻菲啰啉与经活化的白炭黑0.9980 g在乙醇溶液中加热回流等实验条件下制得复合材料,并经红外光谱、紫外分光光度法和荧光分光光度法对复合材料进行表征和光学性质研究,结果表明:邻菲啰啉-白炭黑复合粉体材料具有较好的的紫外吸收和荧光性质.     

Gold Nitride: Preparation and Properties

We review the currently known methods of producing gold nitride and report on the influence of electrically isolated substrates on the growth of gold nitride films by reactive ion sputtering (RIS). It is found that isolation of the substrate decreases grain size and increases nitrogen content, the latter attributed to longer nitrogen ion lifetime on the surface of the growing film. The chemical reactivity of gold nitride is compared with that of pure gold films using the adsorption of 1-dodecyl mercaptan (CH₃(CH₂)₁₁SH) as a model system and it is found that there is no significant difference between gold films and gold nitride in terms of Au–S binding. However, gold nitride nanoparticles are suggested to be worthy of further investigation in terms of their catalytic properties.

Mullite-Tialite Ceramic Materials Based on Chemically Precipitated Mixtures (A Review)

The present state of production of heat-resistant refractory technical ceramics is described. The optimum synthesis conditions and the properties of mullite-tialite ceramic materials based on chemically precipitated mixtures are identified.     

工程材料复习思考（下）

根据本教研室实际教学情况,用科学方法论的思维对教材《机械工程材料》第6～14章做了较为系统的分析,使学生在繁琐的知识点中把握本课程最本质、最重要的内容。取得初步效果。     

Mechanical Properties of the Modified Denture Base Materials and Polymerization Methods: A Systematic Review

Amidst growing technological advancements, newer denture base materials and polymerization methods have been introduced. During fabrication, certain mechanical properties are vital for the clinical longevity of the denture base. This systematic review aimed to explore the effect of newer denture base materials and/or polymerization methods on the mechanical properties of the denture base. An electronic database search of English peer-reviewed published papers was conducted using related keywords from 1 January 2011, up until 31 December 2021. This systematic review was based on guidelines proposed by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). The search identified 579 papers. However, the inclusion criteria recognized 22 papers for eligibility. The risk of bias was moderate in all studies except in two where it was observed as low. Heat cure polymethyl methacrylate (PMMA) and compression moulding using a water bath is still a widely used base material and polymerization technique, respectively. However, chemically modified PMMA using monomers, oligomers, copolymers and cross-linking agents may have a promising result. Although chemically modified PMMA resin might enhance the mechanical properties of denture base material, no clear inferences can be drawn about the superiority of any polymerization method other than the conventional compression moulding technique.     

Colloidal Processing of Silicon Nitride with Poly(acrylic acid): II, Rheological Properties

Poly(acrylic acid) (PAA) was the focus of an investigation in the role and behavior of polyelectrolyte dispersants in aqueous-based colloidal processing of silicon nitride. The steady-shear flow properties of dense suspensions were examined as a function of pH, particle volume fraction, chain length, and polymer concentration. Suspensions exhibited shear-thinning behavior, which was analyzed using the constitutive Bingham equation for plastic flow. The data showed that polyelectrolyte charge and configuration were important in the observed flow behavior. In acidic media, PAA behaved similar to a neutral polymer in a poor solvent, whereas, in alkaline media, PAA behaved similar to a rigid asymmetric particle. Although electrostatic forces dominated flow properties in alkaline media, where PAA was predominantly in the free-polymer form, at lower pH values, PAA interactions with the particle surface resulted in a complex array of suspension effects, including polymer bridging, electrosteric stabilization, and flocculation.     

A Review on Preparation,Properties and Applications of Polymeric Nanoparticle-Based Materials

Polymeric nanoparticles (PNPs)-based materials have gained much deliberation due to advancement in polymer science and technology. PNPs are playing an eccentric role in broad spectrum of applications. The importance of these materials lies in idiosyncratic features associated with PNPs. Due to the impact of the materials on nanotechnology; a comprehensive review has been presented here. We covered not only different techniques for the fabrication of PNPs, but also highlighted the properties and parameters involved and enhanced in PNP-based materials. Moreover the worth of PNP-based materials in applications regarding nanocomposites, drug delivery for cancer treatment, and photovoltaic relevance has been discussed.