A new family of graft copolymers combining hydrophilic and hydrophobic components have recently been proposed as direct compression excipients. Copolymers were synthetised by free radical copolymerisation of starch derivatives with methyl methacrylate (MMA) and were alternatively dried by oven or freeze-drying techniques. The aim of this study was to investigate the water vapour sorption-desorption behaviour of these copolymers, focusing on the influence of variables such as the hydrophobic component and the drying process. Moisture sorption and desorption isotherms were measured at 25 degrees C and analysed according to GAB and Young-Nelson equations, which distinguish between different physical forms of moisture distribution. The Young-Nelson model gave the best fit to the experimental data. The results obtained showed that the presence of the acrylic component modified not only the total hygroscopicity of the copolymers, as compared with the original starch derivatives, but also the water distribution in the solid, which might have an important role in the effect of moisture content on copolymer characteristics. The main water-sorption mechanism seemed to be absorption into the copolymer particles structure, in agreement with their starching nature. In terms of water sorption-desorption characteristics, no marked differences were found between the two drying methods used.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ejpb.2004.10.003 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unveiling the Truth of Interactions between Microplastics and Per- and Polyfluoroalkyl Substances (PFASs) in Wastewater Treatment Plants: Microplastics as a Carrier of PFASs and Beyond.
Environ Sci Technol
January 2025
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China.
Microplastics (MPs) and per- and polyfluoroalkyl substances (PFASs) are ubiquitous contaminants in environments, yet their co-occurrence and interactions remain insufficiently understood. In this study, we confirmed the concurrent presence of MPs and PFASs and their distinct distribution patterns in a wastewater treatment plant (WWTP) through a comprehensive sampling and analysis effort. Significant correlations ( < 0.
View Article and Find Full Text PDFUnveiling the Sorption Properties of Graphene Oxide-M13 Bacteriophage Aerogels for Advanced Sensing and Environmental Applications.
ACS Appl Mater Interfaces
December 2024
School of Chemical Engineering, Advanced Nanomaterials Structures and Applications Laboratories, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K.
GraPhage13 aerogels (GPAs) are ultralow density, porous structures fabricated through the self-assembly of graphene oxide (GO) and M13 bacteriophage. Given GPA's high surface area and extensive porous network, properties typically associated with highly adsorbent materials, it is essential to characterize its sorption capabilities, with a focus on unlocking its potential for advanced applications in areas such as biomedical sensing and environmental monitoring. Herein, the water, ethanol and acetone sorption properties of GPA were explored using dynamic vapor sorption (DVS).
View Article and Find Full Text PDFEffects of microplastics on polycyclic aromatic hydrocarbons migration in Baiyangdian Lake, northern China: Concentrations, sorption-desorption behavior, and multi-phase exchange.
Environ Pollut
February 2025
Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, School of Eco-Environment, Hebei University, Baoding, 071002, PR China. Electronic address:
Article Synopsis
- Microplastics and polycyclic aromatic hydrocarbons (PAHs) were studied in Baiyangdian Lake, China, revealing significant presence in both water and sediment with high average abundances of microplastics.
- The migration of PAHs at lake interfaces was influenced by microplastics, showing specific patterns of volatilization and deposition between water, sediment, and air.
- Overall, the research indicates that microplastics enhance the accumulation of PAHs in aquatic environments, posing a greater risk to water quality and aquatic life.
Cellulosic supergel for oil and water dual absorption and remediation.
Int J Biol Macromol
December 2024
Department of Textile and Fibre Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. Electronic address:
Article Synopsis
- A new binate cellulosic supergel was created to simultaneously absorb oil and water contaminants, using a high internal phase emulsion (HIPE) method.
- The scaffold of the supergel was made from a combination of wood pulp cellulose, hydroxyethyl cellulose, and polyacrylic acid, achieving high porosity with micron-sized interconnected pores.
- This supergel demonstrated a high oil absorption capacity and maintained its performance across multiple cycles, effectively remediating both oil and water pollutants in a single process.
Evolution of radionuclide transport and retardation processes in uplifting granitic rocks: Part 2 - Modelling coupled processes in uplift scenarios.
Sci Total Environ
January 2025
Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33 Muramatsu, Tokai, Ibaraki 319-1194, Japan; Horonobe Underground Research Center, Japan Atomic Energy Agency, 432-2 Hokushin, Horonobe, Hokkaido 098-3224, Japan.
Uplifting fractured granitic rocks occur in substantial areas of countries such as Japan. Some of these areas might be considered when siting a deep geological repository for radioactive wastes. A repository site would be selected in such an area only if it is possible to make a safety case, accounting for the changing conditions during uplift.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!