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Microparticles are particles between 0.1 and 100 μm in size. Commercially available microparticles are available in a wide variety of materials, including ceramics, glass, polymers, and metals. [2] Microparticles encountered in daily life include pollen, sand, dust, flour, and powdered sugar.
Micromeritics is the science and technology of small particles pioneered by Joseph M. DallaValle. [1] It is thus the study of the fundamental and derived properties of individual as well as a collection of particles. The knowledge and control of the size of particles has importance in pharmacy and materials science.
Nanosized particles of titanium dioxide tend to form in the metastable anatase phase, due to the lower surface energy of this phase, relative to the equilibrium rutile phase. [2] Surfaces of ultrafine titanium dioxide in the anatase structure have photocatalytic sterilizing properties, which make it useful as an additive in construction ...
Ostwald ripening is a process in which large particles grow at the expense of the smaller particles as a result of dissolution of small particles and deposition of the dissolved molecules on the surfaces of the larger particles. It occurs because smaller particles have a higher surface energy than larger particles. [50]
Dust is made of fine particles of solid matter. [1] On Earth, it generally consists of particles in the atmosphere that come from various sources such as soil lifted by wind (an aeolian process), volcanic eruptions, and pollution. Dust in homes is composed of about 20–50% dead skin cells. [2]
During active carbonatogenesis, the carbonate particles are produced by ionic exchanges through the cell membrane [32] by activation of calcium and/or magnesium ionic pumps or channels, probably coupled with carbonate ion production. [31] During passive carbonatogenesis, two metabolic cycles can be involved, the nitrogen cycle and the sulfur cycle.
Particulates or atmospheric particulate matter (see below for other names) are microscopic particles of solid or liquid matter suspended in the air.The term aerosol refers to the particulate/air mixture, as opposed to the particulate matter alone, [1] though it is sometimes defined as a subset of aerosol terminology. [2]
An artificial cell, synthetic cell or minimal cell is an engineered particle that mimics one or many functions of a biological cell.Often, artificial cells are biological or polymeric membranes which enclose biologically active materials. [1]