Catalyst deactivation involves a complex interplay of processes taking place at different length and time scales. Understanding this phenomenon is one the grand challenges in solid catalyst characterization. A process contributing to carbon deposition (i. e., coking), which reduces activity by limiting diffusion blocking active sites. However, characterizing coke formation its effects remains c...

Synthesis and degradation of collagen is an essential component of wound healing. In most persons, this deposition of collagen results in the formation of a fine line scar which restores much of the tensile strength to the injured tissue and is cosmetically acceptable. However, in certain individuals, the result of wound healing is the excessive accumulation of collagen, resulting in a hypertro...

Understanding Fe deposition in fluid catalytic cracking (FCC) catalysis is critical for the mitigation of catalyst degradation. Here we employ soft X-ray ptychography to determine at the nanoscale the distribution and chemical state of Fe in an aged FCC catalyst particle. We show that both particle swelling due to colloidal Fe deposition and Fe penetration into the matrix as a result of precrac...

Aluminum coating was prepared on AZ91D magnesium alloy substrate using the electrophoretic deposition (EPD) method in absolute ethanol solvent. In order to determine the optimal concentration of AlCl3.6H2O additive, the zeta potential and size of particles in the suspension were measured in the presence of different concentrations of AlCl3.6H2O. The results showed that an appropriate coating is...

Hydroxyapatite deposition disease (HADD), a disease most commonly found in middleaged individuals, is characterized by deposition of calcium phosphate crystals in periarticular tissues. The deposits frequently occur in tendons near their osseous attachments, most commonly involving the supraspinatus tendon. The etiology of HADD is unclear, but may be related to repetitive trauma or metabolic di...

Introduction: Edema and collagen deposition are processes involved in the inflammatory response, which are fundamental to wound-healing [1]. Despite their diverse symptoms and etiologies, asthma and chronic obstructive pulmonary disease, as well as many other forms of pulmonary pathologies, share the common features of airways remodeling and excess collagen deposition [2]. The mechanisms behind...

chemical vapor deposition (cvd) is one of the most popular methods for producing carbon nanotubes (cnts). the growth rate of cnts based on cvd technique is investigated by using a numerical model based on finite volume method. inlet gas mixture, including xylene as carbon source and mixture of argon and hydrogen as carrier gas enters into a horizontal cvd reactor at atmospheric pressure. in thi...