Determination of the spectrum of the diameters of dispersed particles from their scattering of light

1979 ◽  
Vol 30 (3) ◽  
pp. 372-376
Author(s):  
N. I. Dudo ◽  
A. P. Prishivalko
Keyword(s):  
Scattering Of Light ◽  
Dispersed Particles

The Evolution of Morphology in NR/HDPE Blends. Part I. Microscopy for Unvulcanized Blends

1998 ◽  
Vol 71 (5) ◽  
pp. 966-974 ◽  
Author(s):  
Pasaree Laokijcharoen ◽  
A. Y. Coran
Keyword(s):  
Phase Morphology ◽  
Specimen Preparation ◽  
Sampling Device ◽  
Preparation Methods ◽  
Platinum Alloy ◽  
Dispersed Particles ◽  
Cold Pressed ◽  
Internal Mixer ◽  
Kinetics Of

Abstract Phase morphology is an important factor in the determination of properties of polymer blends. In this work, methods for determining phase morphology of unvulcanized natural rubber (NR)/high-density polyethylene (HDPE) blends were investigated. Small, quick-quenched samples were taken from the internal mixer for examination under scanning electron microscopy (SEM). There was almost no interruption of the mixing because the sampling device was designed for preventing the coalescence of dispersed particles. Three specimen-preparation methods for SEM were considered: (i) OsO4 vapor staining, followed by carbon coating; (ii) toluene etching of NR phase at room temperature, followed by coating of the surface with a platinum alloy; (iii) crosslinking of NR phase by S2Cl2 vapor and then etching of HDPE phase by using boiling xylene. Method (i), OsO4 staining of cryogenic microtomed samples, was selected for the work on the kinetics of dispersion during the mixing process. Vast differences in phase morphology were observed among the types of samples: quick quenched, cold pressed, and compression molded. We considered the quick-quenched samples to have the phase morphology, which was the most similar to that of the blend during its mixing.

scholarly journals INTERPHASE OF BUILDING COMPOSITIONS

2021 ◽  
Author(s):  
А.М. Айзенштадт ◽  
Ю.В. Соколова ◽  
Т.А. Дроздюк ◽  
М.А. Авдушева
Keyword(s):  
Kinetic Model ◽  
Building Materials ◽  
Materials Science ◽  
Colloidal Chemistry ◽  
Dispersed Particles ◽  
Quantitative Characteristics ◽  
Methodological Approaches ◽  
Methodological Principles ◽  
Transformation Processes

Целью данной работы является демонстрация нескольких методологических подходов к решению задач управления процессами трансформационных превращений вещества на границе раздела фаз макроповерхности и в дисперсных системах, которые можно, на наш взгляд, использовать в качестве критериев количественной характеристики одного из основополагающих законов научного направления «Геоника» - закона «Сродства структур». Предложенные подходы базируются на фундаментальных положениях физической и коллоидной химии, кристаллоэнергетики. В качестве данных критериев, позволяющих управлять структурообразованием на межфазной границе, предложены энергетическая интерпретация кинетической модели топохимического взаимодействия компонентов и значение аналоговой постоянной Гамакера. Разработаны методологические принципы экспериментального определения этих характеристик. Проведена апробация предложенных подходов на примере различных тонкодисперсных композиций: глиоксаль-кора, базальт-кора, базальт-полиминеральный кварцево-полевошпатовый песок и базальт-сапонит. Кроме того, коллоидно-химический подход к созданию суспензий на основе тонкодисперсных частиц горных пород, обладающих специфическими свойствами, позволяет синтезировать агрегативно устойчивые суспензии магнитных жидкостей. Приводятся примеры их использования в строительном материаловедении. This work aims to demonstrate several methodological approaches to solving problems of controlling the transformation processes of matter at the interface of the macro-surface and in dispersed systems, which, in our opinion, can be used as criteria for the quantitative characteristics of one of the fundamental laws of the scientific direction "Geonics" - the "Affinity of structures" law. The proposed approaches are based on the fundamental principles of physical and colloidal chemistry, crystal energy. The energy interpretation of the kinetic model of the topochemical interaction of thecomponents and the analog Hamaker constant value are proposed as these criteria make it possible to control the structure formation at the interface. We have developed the methodological principles for the experimental determination of these characteristics. We have tested the proposed approaches on various finely dispersed compositions: glyoxal-bark, basalt-bark, basalt-polymineral quartz-feldspar sand, and basalt-saponite. Besides, the colloidal-chemical approach to the creation of suspensions based on finely dispersed particles of rocks with specific properties makes it possible to synthesize aggregately stable suspensions of magnetic fluids. Examples of their use in building materials science are given.

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