Assessment of dust adhesion forces on the hydrophilic/hydrophobic glasses at two representative CSP sites in Morocco / Ayoub El Baraka in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 1 (01/2023) . - p. 403-412 Titre : Assessment of dust adhesion forces on the hydrophilic/hydrophobic glasses at two representative CSP sites in Morocco Type de document : texte imprimé Auteurs : Ayoub El Baraka, Auteur ; Anouar Jorio, Auteur ; Ahmed Ennaoui, Auteur ; Asmae Khaldoun, Auteur Année de publication : 2023 Article en page(s) : p. 403-412 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Angle de contact Diffractométrie de rayons X Encrassement Energie de surface Granulométrie Miroirs solaires Poussière Revêtements antisalissures Index. décimale : 667.9 Revêtements et enduits Résumé : Many sites with high solar radiation like MENA regions face high dust loads that reduce the efficiency generation of solar plants. In this context, this paper provides an overview of dust adhesion mechanism on the surfaces of concentrated solar power (CSP) mirrors. The assessment of dust adhesion was performed on the hydrophilic/hydrophobic glasses at two representative CSP locations in Morocco (Ouarzazate and Midelt). Two types of reflecting mirrors are examined. The first one is based on superhydrophilic TiO2 protective coating, and the second one is the reflector mirror based on hydrophobic Al2O3 protective coating. The research shows that for particle radius of 2 µm, the Van der Waals force dominates for hydrophobic coating for Midelt with high humidity. In contrast, the capillary forces are prominent on the superhydrophilic TiO2 coating for Ouarzazate with low humidity. The results show good agreement with the X-ray diffraction results. However, as compared to Midelt dust, the dust particles from Midelt are formed of Smectites for the clay fractions. Smectite is highly swelling clay in water compared with Illite, Kaolinite, and Vermiculites types of clay minerals (low swelling clay in water). This work provided a facile method for the calculus of adhesion forces on the surfaces of CSP mirrors and as result helps us to select the best types of anti-soiling coating for reflector mirrors. Note de contenu : - THEORETICAL BACKGROUND : Dust adhesion mechanism - Adhesion forces - EXPERIMENTAL PROCEDURES : Surface energy of dust particles - Dust size distribution - X-ray diffraction of dust particles - Water contact angles (WCA) of solar mirrors - Adhesion forces calculation - Table 1 : Surface energy components of dust particles samples - Table 2 : Water contact angle (WCA) values on solar mirrors samples DOI : https://doi.org/10.1007/s11998-022-00681-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00681-3.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38851 [article]

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CoaST Maritime Test Centre : an investigation of biofouling propensity / Morten L. Pedersen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 857-868 Titre : CoaST Maritime Test Centre : an investigation of biofouling propensity Type de document : texte imprimé Auteurs : Morten L. Pedersen, Auteur ; Burak Ulusoy, Auteur ; Claus Erik Weinell, Auteur ; Frederikke B. Zilstorff, Auteur ; Songgeng Li, Auteur ; Kim Dam-Johansen, Auteur Année de publication : 2023 Article en page(s) : p. 857-868 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Encrassement Essais (technologie) Evaluation Revêtements -- Détérioration Salissures biologiques Test d'immersion Index. décimale : 667.9 Revêtements et enduits Résumé : The performance of fouling control coatings (FCC) is evaluated based on static exposure on test sites worldwide. There are different standards concerning the evaluation of the performance of the FCC. However, to the knowledge of the authors, there is not a standardized reporting guideline for how to evaluate the test site in which the FCC is exposed. Several factors such as water conditions, seasonal biofouling, and accessibility of sunlight can vary dependent on placement within or between test sites. This in turn makes it difficult to compare the performance of FCC exposed at different locations within a or at another test site. In this study, an analysis of the CoaST Maritime Test Centre (CMTC) has been performed to investigate how geographical orientation and changes in depth influence the biofouling propensity on coated panels. The investigation showed no statistical significance in the biofouling propensity between panels exposed to different geographical orientations at the CMTC. Similarly, no statistical significance was found between panels placed at different depths at the CMTC. If similar reporting was performed at other test sites, a better basis for comparison of FCC worldwide would be obtained, and this could be achieved with a standardized reporting guideline. Note de contenu : - METHOD : CoaST Maritime Test Centre - Test panels - Evaluation method - RESULTS AND DISCUSSION : Biofouling environment at the CMTC - The influence of geographical orientation on the biofouling propensity - The influence of depth on the biofouling propensity - Horizontal setup - Standardized reporting for comparability of FCC within and between test sites - Table 1 : The coverage percentage intervals and the related weighted values for the four biofouling categories - Table 2 : Investigation of the influence of geographical orientation on biofouling growth - Table 3 : The significance of the biofouling deviation between the cartridges fourth and fifth row, due to the difference in depth DOI : https://doi.org/10.1007/s11998-022-00707-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00707-w.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39433 [article]

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Effective removal of manure-mud balls from cattle hides using thioglycolate salt containing formulations / Hailemichael O. Yosief in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 9 (09/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 9 (09/2022) . - p. 359-366 Titre : Effective removal of manure-mud balls from cattle hides using thioglycolate salt containing formulations Type de document : texte imprimé Auteurs : Hailemichael O. Yosief, Auteur ; Majher I. Sarker, Auteur ; Syed Ammar Hussain, Auteur ; Zerlina E. Muir, Auteur Année de publication : 2022 Article en page(s) : p. 359-366 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bovins -- Fumier Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Encrassement Formulation (Génie chimique) Peaux brutes -- Nettoyage pH -- Mesure Produits nettoyants Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effective removal of hardened manure/mud balls from cattle hides remains a challenge for the livestock industry. Hardened manure/mud balls must be removed to minimize the risk of microbial meat contamination and hide quality deterioration. To overcome this challenge, we developed thioglycolic acid and its sodium, potassium and ammonium salts containing formulations. In this study, the developed four formulations were compared based on their efficacy in removing adobe type mud/manure balls from the hides in short time. Hide pieces containing hardened manure/mud balls were soaked in the formulations for 5 minutes followed by gentle brushing to remove the debris. The firmly attached mud/manure balls were removed completely from the hide pieces soaked in sodium, potassium and ammonium thioglycolate containing formulations. However, thioglycolic acid containing formulation did not show that much efficacy and the debris remained attached in the hide pieces soaked in water which was used as a control. Moreover, naturally onboard aerobic bacteria count was significantly reduced along with the mud/manure balls removal from hide pieces. After treatment, the hide pieces were processed into crust shoe leather for quality check analysis including mechanical properties, leather surface analysis and general appearance. The crust leathers made from hide pieces treated with the formulation exhibited similar quality to that made from the control. The implementation of this inventive formulations in slaughterhouses or leather industry will drastically reduce the time consuming and labor-intensive operations currently employed to remove firmly attached debris from cattle hide surface. Note de contenu : - MATERIALS AND METHODS : Preparation of mud/manure removing formulation - Determination of pH of the developed formulations - Manure/mud removing method - Microbial testing - Tanning and leather quality analysis - RESULTS AND DISCUSSION : pH of the developed formuations - Efficacy of different manure/mud removing formulation - Aerobic bacterial count - Quality analysis of crust leather - Mechanical properties - Grain surface analysis of leather panels - Subjective test analysis of leather panels - Table 1 : Composition of manure removing formulations - Table 2 : pH of the formulations - Table 3 : Mechanical properties of the finished leather product after treating with the manure removing formulations - Table 4 : Subjetive properties for leather samples made after treating with the manure removing formulations DOI : https://doi.org/10.34314/jalca.v117i9.6166 En ligne : https://drive.google.com/file/d/1JB9yZYBthDABNNz2SoWMy7SEBJdA2RdR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38075 [article]

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Estimation of long-term drag performance of fouling control coatings using an ocean-placed raft with multiple dynamic rotors / A. Lindholdt in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 975-995 Titre : Estimation of long-term drag performance of fouling control coatings using an ocean-placed raft with multiple dynamic rotors Type de document : texte imprimé Auteurs : A. Lindholdt, Auteur ; Kim Dam-Johansen, Auteur ; D. M. Yebra, Auteur ; S. M. Olsen, Auteur ; Søren Kiil, Auteur Année de publication : 2015 Article en page(s) : p. 975-995 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calcul Encrassement Essais dynamiques Mesure Résistance à la salissure Revêtements antisalissures:Peinture antisalissures Salissures biologiques Salissures marines Index. décimale : 667.9 Revêtements et enduits Résumé : An experimental setup was designed and built to estimate changes in the skin friction of fouling control coatings (FCC) over an extended period of time in conditions simulating the vast majority of ship profiles (regarding speed and activity) in the present market. The setup consisted of two separate parts: one aged FCCs directly in seawater in a dynamic manner by simulating the exposure condition of a ship’s hull, and a second, laboratory part measured the torque (drag) of aged coatings in a rotary setup. From the spring to the autumn of 2013 and 2014, four commercial FCCs were exposed for 53 weeks in Roskilde Fjord, Denmark, which is characterized by relatively cold seawater and a salinity of approximately 1.2 wt%. The in situ immersion seawater conditions consisted of five-week cycles divided into 2 weeks of static immersion and 3 weeks of dynamic immersion, during which time the cylinders were rotated at a tangential velocity of 8.1 knots. The skin friction was found to generally increase more during the static period, compared to the dynamic ones. Over the course of the entire exposure period, the skin friction of the investigated FCCs decreased in the following order: fluorinated fouling release coating (FRC) (highest skin friction), hydrogel-based FRC without biocides, silylated acrylate self-polishing copolymer coating, and hydrogel-based FRC with biocides (lowest skin friction). However, the differences in skin friction between the latter three coatings were minor and often within the range of experimental uncertainty. The average surface roughness of the FCCs in the newly applied and mechanically cleaned condition, determined as the Rt(50) and R z parameters, was evaluated as poor predictors of skin friction. Note de contenu : - EXPERIMENTAL SETUP : Drag performance measurement setup - Aging setup - Measurement procedure - MATERIALS AND SAMPLE PREPARATION : Surface roughness measurements - CONVERSION OF TORQUE INTO FRICTION COEFFICIENTS : Conversion of laboratory torque values into friction coefficients for cylinders and flat plates - Estimation of the experimental uncertainty - RESULTS AND DISCUSSION : Smooth cylinder - Material properties - Visual biofouling grading - Drag performance of fouling control coatings - Fuel and power predictions for a tanker DOI : 10.1007/s11998-015-9713-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9713-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24931 [article]

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Factors affecting dirt pickup in latex coatings / Alan Smith in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 862 (11/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 862 (11/1996) . - p. 37-41 Titre : Factors affecting dirt pickup in latex coatings Type de document : texte imprimé Auteurs : Alan Smith, Auteur ; Oliver Wagner, Auteur Année de publication : 1996 Article en page(s) : p. 37-41 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Copolymère styrène acrylique Elastomères Encrassement Poussière Réticulation (polymérisation) Revêtements Revêtements en bâtiment Revêtements en phase aqueuse:Peinture en phase aqueuse Thermoplastiques Une matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire. Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : Latex coatings are based on thermoplastic polymer. Their tendency to pick up dirt is greatly influenced by the glass transition temperature of the polymer. However, glass transition temperature is not the only polymer property influencing dirt pickup ; hydrophobic modification has been found to be particularly beneficial in textured coatings while monomer selection and crosslinking chemistries have beneficial effects on paints and elastomeric coatings. Good correlation has been found between water sensitivity and water vapor permeability of polymer compositions, and the dirt pickup observed in coatings formulated with them. Note de contenu : - Influence of glass transition temperature - Influence of crosslinking - Influence of surface morphology - Mechanism of dirt pickup - Influence of hydrophobicity - Influence of monomer type Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18453 [article]

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Investigation of the impact of latex components on the survival of Pseudomonas aeruginosa / Alicyn M Rhoades in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 8 (10/2005)  

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Towards a comprehensive understanding of dirt pickup resistance / Scott C. Brown in COATINGS TECH, Vol. 17, N° 6 (06/2020)  

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Where does the deposit come from ? / Daniel Grüber in PLASTICS INSIGHTS, Vol. 113, N° 7 (2023)  

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