From compressibility to structural investigation of sodium dodecyl sulphate — Part 1: Powder and tablet physico-chemical characteristics

Abstract

7 pagesInternational audienceAs a part of a study on detergent tablets, investigations were carried out to elucidate the compression behavior of a powdered surfactant, sodium dodecyl sulphate (SDS), based on a comparison with the main component of the formulation, i.e. the chorine provider (DCCNa). The compacted SDS exhibited poor cohesion as well as delayed dissolution whatever the compression pressure. The microscopic observations and the mercury porosimetry measurements both demonstrated that a residual porosity existed in the tablets but the dissolution times were always long. A modification of SDS in contact with water, forming a structure like a gel, probably occurred, inducing the closing of the pores and thereby limiting the water intrusion into the tablets

Water droplet spreading and recoiling upon contact with thick–compact maltodextrin agglomerates

“…The agglomerates (compressed tablets, 13 mm diameter and 4.5 mm height) were prepared by using a Carver hydraulic laboratory press (Model C S/N 32 000‐224, Carver Inc., Wabash, IN, USA) working with a 75 MPa die (WQ09D; Perkin Elmer, Cambridge, UK) and pouring 0.7 g of the powder samples (corresponding to each of the eight sieved fractions) into the die for powder compression 18, 19. Two compaction forces, 75 MPa (A agglomerates) and 225 MPa (B agglomerates), were applied to form the agglomerates.…”

Dissolution of a surfactant-containing active porous material

“…For a detailed discussion of the characteristics of the parameters listed in Table 1, the authors recommend Refs. [18,19] for further reading.…”

A Novel Hydrate Form of Sodium Dodecyl Sulfate and Its Crystallization Process

“…However, for most crystallization processes, surfactants are used as an additive to modify crystal properties, − to assemble mesocrystals (three-dimensionally well-aligned nanosized particles), or to affect nucleation and crystal growth through the manipulation of interfacial tension . Only a few studies on surfactant crystallization itself were reported, and yet, a diversity of crystal attributes, such as polymorphs and pseudo-polymorphs, morphologies, and size distributions of a crystalline substance, have implications in downstream processing characteristics and product performance. − For instance, flowability, compressibility (i.e., tabletability), and dissolution rate are often considered for powdered detergents or tablets . The understanding of surfactant crystallization can definitely help in the control of those attributes of a product surfactant for surfactant-based products, especially when the crystallization mechanisms for surfactant systems are complex.…”

“…15−17 For instance, flowability, compressibility (i.e., tabletability), and dissolution rate are often considered for powdered detergents or tablets. 18 The understanding of surfactant crystallization can definitely help in the control of those attributes of a product surfactant for surfactant-based products, especially when the crystallization mechanisms for surfactant systems are complex. When the surfactant concentration is above the critical micelle concentration (CMC), its kinetic processes of micelle formation and crystal nucleation are competing with each other.…”