Roger Gaudreault

Roger Gaudreault
Université de Montréal | UdeM · Department of Physics

Ph.D.

About

48
Publications
33,754
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306
Citations
Introduction
Currently, I am working on the impact of green chemistry to mitigating Alzheimer's Disease. My scientific interests are Green chemistry, Colloid chemistry, Alzheimer's Disease, COVID-19, Molecular modeling, Pulp bleaching, Papermaking, Recycling, Corrosion inhibition, Biomolecules and Biomaterials.
Additional affiliations
August 2005 - December 2006
Harvard University
Position
  • PostDoc Position
Description
  • My research at Harvard was on the kinetics of colloids aggregation applied to papermaking: 1) Gaudreault et al.; Colloids and Surfaces A: Physicochem. Eng. Aspects 340 (2009) 56–65; and 2) Gaudreault et al.; Ind. Eng. Chem. Res. 2015, 54, 6234−6246.
January 1997 - December 2003
McGill University
Position
  • PhD
Description
  • My PhD was on the Flocculation Mechanisms of Poly(Ethylene Oxide) with Novel Cofactors: Theory and Experiment.

Publications

Publications (48)
Article
Full-text available
When the percentage of filler in paper is increased, the optical properties are improved and the production cost lowered. However, fillers weaken paper strength by decreasing the fibre–fibre bonded area. Little is known about the optimum filler floc size or filler floc properties to allow developing optimum paper characteristics. Consequently, the...
Article
Full-text available
Poly(ethylene oxide), a widely used flocculation agent, has its efficiency enhanced by various compounds known as cofactors. The cofactors are known to form an association complex with poly(ethylene oxide) (PEO). The mechanism of interaction of non-ionic poly(ethylene oxide) with the model cofactors tannic acid (TA), corilagin, polystyrene sulfonat...
Article
Full-text available
Because of persistent economic pressure on cost reduction, inorganic fillers such as precipitated calcium carbonate (PCC) have become increasingly economically attractive in the papermaking process. The increase of filler level in paper can be achieved by adding it to pulp prior to the headbox, either as individual filler particles or as preaggrega...
Article
Full-text available
According to Alzheimer’s Disease International (ADI), nearly 50 million people worldwide were living with dementia in 2017, and this number is expected to triple by 2050. Despite years of research in this field, the root cause and mechanisms responsible for Alzheimer’s disease (AD) have not been fully elucidated yet. Moreover, promising preclinical...
Article
Full-text available
Alzheimer’s disease (AD) is the most common age-related neurodegenerative disorder, responsible for nearly two-thirds of all dementia cases. In this review, we report the potential AD treatment strategies focusing on natural polyphenol molecules (green chemistry) and more specifically on the inhibition of polyphenol-induced amyloid aggregation/disa...
Article
Full-text available
The overall impact of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) on our society is unprecedented. The identification of small natural ligands that could prevent the entry and/or replication of the coronavirus remains a pertinent approach to fight the coronavirus disease (COVID-19) pandemic. Previously, we showed that the phenolic...
Article
Full-text available
The COVID-19 disease caused by the virus SARS-CoV-2, first detected in December 2019, is still emerging through virus mutations. Although almost under control in some countries due to effective vaccines that are mitigating the worldwide pandemic, the urgency to develop additional vaccines and therapeutic treatments is imperative. In this work, the...
Research
Full-text available
In February 2016, The Festschrift Committee along with the Pulp and Paper Technical Association of Canada (PAPTAC) hosted a special event to celebrate Dr. Theo van de Ven illustrious career and his numerous scientific and industrial contributions in the fields of colloids, polymers, papermaking and cellulose science – all of which are highly releva...
Conference Paper
Full-text available
The use of make-up water sources having a high-silica concentration has proven to be a major challenge for the operation of industrial steam boilers. Despite advances in conventional deposit control technologies, high-silica boiler water (>150 mg/L as SiO2) continues to have a major impact on the operation and efficiency of boilers. The primary con...
Book
Full-text available
THEO: A Lifetime of Outstanding Contributions to Academia and Industry In February 2016, The Festschrift Committee along with the Pulp and Paper Technical Association of Canada (PAPTAC) hosted a special event to celebrate Dr. Theo van de Ven’s illustrious career and his numerous scientific and industrial contributions in the fields of colloids, po...
Article
Full-text available
Kinetic calculations provide an estimate of the time scales of the various interactions between fibre, polymer, and colloids. Knowledge of these time scales provides us with a tool to determine the optimum location of addition points in papermaking processes. Such calculations have been made in the past, but their validity has never been tested. Va...
Chapter
Full-text available
Does the Forest/Pulp & Paper industry need to be transformed? Most of us would say yes, solely based on the fact that mills are closing faster than technology is being developed and implemented. For example, in Quebec 122 mills were built since 1805 and only one third of them are still in operation. Moreover, fundamental trends such as world popula...
Article
Full-text available
For more than four decades, tannins extracted from renewable resources have been used to protect steam boilers at levels significantly above ASME guidelines. Using tannin-based (green) corrosion inhibitors reduces water and energy consumption, greenhouse gases emissions, and contaminants in effluent wastewaters, while reducing the environmental foo...
Data
Full-text available
For more than four decades, tannins extracted from renewable resources have been used to protect steam boilers at levels significantly above ASME guidelines. Using tannin-based (green) corrosion inhibitors reduces water and energy consumption, greenhouse gases emissions, and contaminants in effluent wastewaters, while reducing the environmental foo...
Article
Full-text available
Tannins extracted from renewable resources are green molecules that protect steam boilers much above ASMEguidelines, for more than four decades. Using purified tannin-based corrosion inhibitors reduces water and energy consumption, greenhouse gas emissions, and effluent contamination, while reducing the environmental footprint of industry. The aut...
Conference Paper
Full-text available
Tannins extracted from renewable resources are green molecules that protect steam boilers much above ASME guidelines, for more than four decades. Using purified tannin-based corrosion inhibitors reduce water and energy consumption, greenhouse gases emissions, and contaminants to the effluents; while reducing the environmental footprint of Industry....
Conference Paper
Full-text available
This paper reinforces the view that innovative green molecules can meet today’s industrial water treatment needs while reducing overall water consumption in commercial and industrial facilities. Tannin molecules, extracted from renewable resources, are examples of green molecules that have continued to protect steam boilers well above ASME guidelin...
Conference Paper
Full-text available
The paperboard industry is committed to consumer protection in food packaging and has assigned top priority to the issue of mineral oil hydrocarbons (MOH) as early as spring 2010. In this work, we have developed practical methods, using gas chromatography with a flame ionization detector (GC-FID) laboratory equipment, to characterize the level of m...
Article
Full-text available
Written for the Dept. of Chemistry. Thesis (Ph.D.). Includes bibliographical references.
Conference Paper
Full-text available
Cascades vision is to be the leader in “green” packaging and tissue paper products in North America and to promote an entrepreneurial and innovative culture. One of the key elements of Cascades Innovation strategy is to develop processes and products to reduce its environmental footprint. From Cascades perspective, Green Chemistry is the use of gre...
Book
Full-text available
The 2011 Fundamental and Applied Pulp and Paper Modelling Symposium (FAPPMS 2011) was designed to bring together Practical and Theoretical Scientists working at the cutting edge of Papermaking. The Symposia stimulated the use of Molecular and Classical Modelling for the Pulp and Paper Industry, and the development of effective Modelling insights to...
Conference Paper
Full-text available
When the percentage of filler is increased in paper, the optical properties are improved and the production cost lowered. However , fillers weaken paper strength by decreasing the fibre-fibre bonded area. Little is known about the optimum filler floc size or filler floc properties to allow developing optimum paper characteristics. Consequently, the...
Conference Paper
Full-text available
When the percentage of filler is increased in paper, the optical properties are improved and the production cost lowered. How-ever, fillers weaken paper strength by decreasing the fibre-fibre bonded area. Little is known about the optimum filler floc size or filler floc properties to allow developing optimum paper characteristics. Consequently, the...
Method
Full-text available
Our contribution was to emphasize the importance of hand drying since about 80% of the diseases are transferred through contaminated hands. It is critical to clean your hands but as important to properly dry your hands, i.e. the neglected side of hand hygiene!
Conference Paper
Full-text available
This review provides a better understanding of the underlying molecular mechanism of the association between poly(ethylene oxide) (PEO) and cofactor, a flocculation system used in papermaking. This association is necessary to induce fibre-fines flocculation. The binding of PEO or PEG based molecules with electrolytes is discussed. Salt is essential...
Conference Paper
Full-text available
Poly(ethylene oxide), a fines flocculation agent, has its efficiency enhanced by various compounds called cofactors. The cofactors form an association complex with PEO. The mechanism of interaction of non-ionic poly(ethylene oxide) (PEO) with model cofactors (Gallic acid and 1,3,6-tri-O-Galloyl-b-D-Glucose) was theoretically studied using PM3 Semi-...
Book
Full-text available
The objectives of the 2008 Fundamental and Applied Pulp & Paper Modelling Symposium were to bring together Practical and Theoretical Scientists working at the cutting edge of papermaking modelling. Also to stimulate the use of Molecular and Classical Modelling in the Pulp & Paper Industry and to develop more effective Molecular Systems to provide u...
Patent
Full-text available
The invention relates to a method for improving the production yield of precipitated calcium carbonate (PCC). The improvement resides in the use of an enzymatic bioreactor that supplies HCO3 into the reaction enabling to produce PCC without bubbling gaseous carbon dioxide in the aqueous solution. The present invention has an industrial applicabilit...
Article
Full-text available
Describing interactions among large molecules theoretically is a challenging task. As an example, we investigated gas-phase interactions between a linear nonionic oligomer and various model compounds (cofactors), which have been reported to associate experimentally, using PM3 semiempirical molecular orbital theory. As oligomer, we studied the hexam...
Conference Paper
Full-text available
White-grade recycled fibres, mixed office waste (MOW), was first introduced at Cascades Tissue Group in July 1991. In 1994, the average mechanical pulp content was approximately 3 to 4% and when the percentage of mechanical pulp content rose above 7% the optical properties were negatively affected. The current mechanical pulp content of MOW is appr...
Article
Full-text available
PM3 Semi-empirical molecular orbital calculations on the interaction of water and gallic acid (GA) show the hydrophilic part of the solute (GA) to form strong directional bonds to 5 H 2 O molecules. To form a monolayer around GA, containing trigalloyl glucose both hydrophilic and hydrophobic regions, requires about 43 H 2 O molecules. PM3, MM and M...
Conference Paper
Full-text available
Poly(ethylene oxide) (PEO), a widely known flocculation agent used primarily as a fines retention aid in mechanical grade papers, has its efficiency enhanced by various compounds, known as cofactors. These cofactors form a complex with PEO, which acts as an efficient bridging agent for fines flocculation. The nature of the PEO/cofactor complex is m...
Conference Paper
Full-text available
Poly(ethylene oxide) (PEO), a widely known non-ionic flocculation agent used primarily as a fines retention aid in mechanical grade papers, has its efficiency enhanced by various compounds, called cofactors. These cofactors form a complex with PEO, which acts as an efficient bridging agent for fines flocculation. The chemical interactions in the PE...
Book
Full-text available
The objectives of the World’s First Molecular Modelling Symposium in the field of Pulp and Paper were to bring practical and theoretical scientists together; to stimulate the use of Molecular Modelling in the Pulp and Paper Industry; to act as a nucleus for the development of more efficient molecules and to provide a clear understanding of the unde...
Thesis
Full-text available
In modern papermaking, the use of retention aids, which help to effectively incorporate fines and fillers into a sheet of paper, is widespread. Various single, dual and multi-component retention aid systems are available, one example of which is poly(ethylene oxide) and cofactor, the topic of this thesis. The mechanisms by which such systems functi...
Conference Paper
Full-text available
Pulp freeness depends on whether the dilution water is deionised or tap water: the freeness is lower with deionised water. The difference in pulp freeness between deionised and tap water increases with refining, especially with bleached hardwood kraft pulps. The pulp freeness difference decreases with lignin concentration increase, and increases wi...
Article
Full-text available
The most stable structures of two poly(ethylene oxide) (PEO) model cofactors, beta-1-O-galloyl-3,6-( R)-hexahydroxydiphenoyl- d-glucose (corilagin) and 1,3,6-tri-O-galloyl-beta- d-glucose (TGG), are calculated using molecular modeling and PM3 semiempirical molecular orbital theories. The theoretical PM3 structures agree with interpreted structures...
Patent
Full-text available
The mulch comprises a sheet of paper having a thickness between 2 and 4 mils and a basis weight between about 40 g/m2 and 60 g/m2. The sheet has at least one face coated with a layer of polylactide, which is used in an amount such that it weighs between about 2 g/m2 and 15 g/m2. The preparation is carried out by depositing on the sheet an amount of...
Conference Paper
Full-text available
The bleaching sequence P (H2O2) Pulper F (FAS)tower for sorted Mixed Office Waste (MOW) containing approximatively 3-4 % mechanical pulp gave a higher and more stable brightness than a single stage (F-tower). The brightness gain associated with the Ppulper>with an addition rate of 0.9% H2O2, seems to be approximately 3.3% ISO. Using the PF bleachin...
Chapter
Full-text available
The methodology describes the various steps in volved in the quantification of sticky contaminants at room temperature with surface areas equal to or greater than 0.08 m2m using an interactive image analyzer. Recycled wood-free papers are used in this study. This description covers the method used to prepare samples, i.e., pulp disintegration, 1abo...
Patent
Full-text available
The invention is a method for recycling paper products involving removal and control of stickies and deinking of pulp and paper in papermaking processes using wastepaper. The method for reducing stickies in pulping comprises adding a cationic kaolin to a stickies-containing furnish of wastepaper fiber such that the kaolin attaches to the stickies,...
Patent
Full-text available
Methods for reducing stickies and removing ink from wastepaper fiber wherein a cationic kaolin is added to a wastepaper fiber furnish under conditions such that the kaolin attaches to the stickies or the ink and the stickies or ink are removed from the furnish using a centrifugal cleaner. https://www.google.com/patents/US5540814
Article
Full-text available
This paper describes a methodology for the performance evaluation of different soaps/surfactants used for ONP/OMG deinking, which combine selection of critical parameters, mathematical treatment of the results using different techniques, and process considerations. The conclusions of this work are that critical parameters have to be carefully selec...
Conference Paper
Full-text available
Deinking trials were done at Lamort's pilot plant in France, as shown by Figure 1. The goal was to make 100% deinked pulp containing 40, 50 and 60% magazine, the remaining being ONP. Then, mixtures of deinked pulp with thermomechanical pulp were prepared in the proportions of 0-60% vs 40-100% respectively. Then, the physicochemical and optical prop...

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