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Journal articles
Effects of biopolymer coatings on paper permeability and capillarity for paper-based rapid diagnostic test devices, TAPPI Journal September 2025
ABSTRACT: Rapid diagnostic test (RDT) devices are widely used for diagnostics due to their affordability, portability, and user-friendliness. However, conventional assays typically rely on nitrocellulose membranes and plastic casings. These materials raise environmental concerns due to their non-renewable nature, energy-intensive production methods, and poor biodegradability. This study explores the development of fully bio-based RDT substrates using a sustainable alternative: softwoodderived microfibrillated cellulose (MFC), cellulose nanocrystals (CNC), and chitosan as surface modifiers to improve paper properties and enhance RDT sustainability. Cotton filter paper substrates were coated with different biopolymer formulations using a manual blade coater: bleached MFC (BMFC), lignin-containing MFC (LMFC), BMFC combined with CNC, LMFC combined with CNC, and chitosan. Evaluation of the most relevant physical properties concerning RDT performance was conducted, including wetting, water retention value, air permeability, capillary flow rate, and surface morphology. Results showed that biopolymer- based coatings can effectively modify surface properties by reducing pore size and tuning hydrophilicity, while maintaining the renewable and bio-based characteristics of the substrate. The LMFC-coated paper exhibited the best overall performance among all formulations, reducing flow time by 50% (3.00 mm/s vs. 1.5 mm/s) compared to the uncoated paper, yet preserving high water retention. The BMFC+CNC coating also significantly improved flow rate, showing a 36.7% reduction (2.37 mm/s vs. 1.5 mm/s), and enhanced porosity uniformity. In contrast, the flow rate of chitosan-coated paper decreased by over 5,000% (0.027 mm/s), reflecting its strong barrier properties and hydrophobic surface (highest contact angle: 91.4°). These findings suggest that MFC-based coatings are promising ecofriendly alternatives to nitrocellulose, offering optimized capillary transport and structural adaptability. This paves the way for the development of sustainable, high-performance, rapid diagnostic tests.
Journal articles
Toward environmental resilience in pulp and paper manufacturing: Water consumption and carbon dioxide emission reductions, TAPPI Journal September 2025
ABSTRACT: Pulp and paper manufacturing is a water- and energy-intensive industrial sector, necessitating improvement of its operational efficiency, as well as reduction of emissions to the maximum extent possible. This review focuses on the reduction of water consumption and carbon dioxide (CO2) emissions that originate in the pulp and paper industry (PPI). First, process simulation and optimization techniques used for water consumption reduction are reviewed. Then, techno-economic analyses of solvent-based CO2 capture from PPI are discussed. Additionally, key actions are proposed for enhancing water consumption reduction and CO2 capture in PPI.
Journal articles
Effect of particle size and density in flotation deinking of
Effect of particle size and density in flotation deinking of electrostatic papers, TAPPI JOURNAL, July 1994, Vol. 77(7)
Journal articles
Prediction of velocity and coat-weight limits based on filte
Prediction of velocity and coat-weight limits based on filter-cake formation, TAPPI JOURNAL, July 1994, Vol. 77(7)
Journal articles
Predicting print mottle: a method of differentiating between three types of mottle, TAPPI JOURNAL, July 1994, Vol. 77(7)
Predicting print mottle: a method of differentiating between three types of mottle, TAPPI JOURNAL, July 1994, Vol. 77(7)
Journal articles
The dagbladet full-scale printing trials: part 3: linting in four-color offset printing, TAPPI JOURNAL, July 1994, Vol. 77(7)
The dagbladet full-scale printing trials: part 3: linting in four-color offset printing, TAPPI JOURNAL, July 1994, Vol. 77(7)
Journal articles
Monitoring flocculation on the paper machine, TAPPI JOURNAL,
Monitoring flocculation on the paper machine, TAPPI JOURNAL, July 1994, Vol. 77(7)
Journal articles
The effect if atmospheric pollutants on paper permanence: a
The effect if atmospheric pollutants on paper permanence: a literature review, TAPPI JOURNAL, July 1994, Vol. 77(7)
Journal articles
Vacuum pyrolysis of bark residues and primary sludges, TAPPI
Vacuum pyrolysis of bark residues and primary sludges, TAPPI JOURNAL, July 1994, Vol. 77(7)
Journal articles
A combined discrete-continuous simulation model of an rdh ta
A combined discrete-continuous simulation model of an rdh tank farm, TAPPI JOURNAL, July 1994, Vol. 77(7)