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| 1 | Alkali treated Foumanat tea waste as an efficient adsorbent form ethylene blue adsorption from aqueous solution显示文摘 | Azadeh E P Elham S Moslem B | 2014 | Water Resources and Industry2014，6，： | 1 |
| 2 | Hydrolysable Chestnut Tannin Extract Chemical Complexity in Its Reactions for Non-Isocyanate Polyurethanes(NIPU)Foams显示文摘Non-isocyanate polyurethane(NIPU)foams from a commercial hydrolysable tannin extract,chestnut wood tannin extract,have been prepared to determine what chemical species and products are taking part in the reactions involved.This method is based on two main steps:the reaction with dimethyl carbonate and the formation of urethane bonds by further reaction of the carbonated tannin with a diamine-like hexamethylene diamine.The hydroxyl groups on the tannin polyphenols and on the carbohydrates intimately linked with it and part of a hydrolysable tannin are the groups involved in these reactions.The carbohydrate skeleton of the hydrolysable tannin is also able to participate through its hydroxyl groups to the same two reactions rendering the whole molecular complex able to react to form NIPUs.The analysis by Matrix-Assisted Laser Desorption Ionization(MALDI-TOF)mass spectrometry and 13C Nuclear Magnetic Resonance(13C NMR)to further investigate the reaction mechanisms involved revealed the unsuspected complexity of chestnut hydrolysable tannin,with different fragments reacting in different manners forming a hardened network of considerable complexity.As the morphology and performance of these types of foams changes slightly with the change in the amount of glutaraldehyde and hexamine hardeners,the best performing foam formulation previously determined was scanned by SEM and analysed chemically for the structures formed. | Elham Azadeh Antonio Pizzi Christine Gerardin-Charbonnier Philippe Gerardin | 2023 | Journal of Renewable Materials2023，11，6： | 0 |
| 3 | Modification of Wood by Tannin-Furfuryl Alcohol Resins-Effect on Dimensional Stability,Mechanical Properties and Decay Durability显示文摘Furfurylation is a well-known wood modification technology.This paper studied the effect of tannin addition on the wood furfurylation.Three kinds of dicarboxylic acids,adipic acid,succinic acid,and tartaric acid,as well as glyoxal as a comparing agent,were used to catalyse the polymerisation of furanic or tannin-furanic solutions during wood modification.Impregnation of furanic or tannin-furanic solution at a certain concentration into the wood followed with curing at 103℃for a specific duration was performed for the wood modification.Different properties of the modified woods like dimensional stability,resistance of treatment to leaching,mechanical properties,decay durability against white-rot(Coriolus versicolor,Pycnoporus sanguineus)and brown-rot(Coniophora puteana)as well as their chemical and anatomical characteristics were evaluated.Results revealed that the partial substitution of FA by the tannins improved the fixation of the chemicals impregnated in wood.Further,dimensional stability,leaching resistance,Brinell hardness,modulus of elasticity/modulus of rupture,and decay durability properties of the furfurylated wood were also improved in the presence of tannins.Scanning electron microscopy revealed the deposition of the polymer in the wood lumen cells and in the wood cell walls. | Mahdi Mubarok Christine Gérardin-Charbonnier Elham Azadeh Firmin Obounou AkongStéphane Dumarçay Antonio Pizzi Philippe Gérardin | 2023 | Journal of Renewable Materials2023，11，2： | 0 |
| 4 | Placental pathologies and fetal outcome in pregnant women with COVID-19: A retrospective study显示文摘Objective:To describe histopathologic findings in the placentas in women with coronavirus disease 2019(COVID-19)during pregnancy.Methods:In a cross-sectional study,38 pregnant women with COVID-19 and undergoing delivery between March 2020 and January 2022,were included.The patients had positive polymerase chain reaction(PCR)test for SARS-CoV-2 infection and the placentas after delivery were sent for histopathologic evaluation based on the Amsterdam Placental Workshop Group Consensus Statement and assessed by two pathologists.Results:Our results showed that maternal vascular malperfusion was the most common and was present in 17 cases(44.7%).These features included accelerated villous maturation(36.8%)distal villous hypoplasia(5.3%),placental infarction(5.3%)and intervillous fibrin deposition(10.5%).Other pathologic findings included focal calcification(10.5%),intravillous congestion and hemorrhage(10.5%),sub-chorionic hemorrhage(5.3%),acute villitis,chronic histiocytic intervillositis and delayed villous maturation each in one case(2.6%).Twelve out of 38 cases showed no significant pathologic changes.Fetal outcomes included neonatal intensive care unit admission rate of 13.2%,dyspnea 31.6%,newborn’s anosmia 7.9%,intrauterine fetal demise 2.6%,asphyxia 2.6%and neonate COVID infection 5.3%.Conclusions:Microvasculopathy,as a sign of maternal vascular malperfusion,is a common finding in placentas from SARS-CoV-2 positive pregnant women in the present study.Further studies with larger sample sizes and comparative studies between COVID-19 positive and negative,as well as information from patient follow-up are suggested. | Soheila Sarmadi Ara Omranipour Elham Mirzaian Roghayyeh Ahangari Zahra Yazdi Azadeh Asgarian Monireh Mirzaie | 2022 | Asian pacific Journal of Reproduction2022，11，3： | 0 |
| 5 | Self-Blowing Non-Isocyanate Polyurethane Foams Based on Hydrolysable Tannins显示文摘ABSTRACT Non-isocyanate polyurethane(NIPU)foams using a hydrolysable tannin,also vulgarly called tannic acid,namely here commercial chestnut wood tannin extract was prepared.Compression strength did not appear to depend on the foam apparent density while the formulation composition of the NIPU foams has been shown to be more determinant.These NIPU foams appeared to be self-extinguishing once the high temperature flame is removed.The ignition time gave encouraging results but for improved fire resistance the foams may need some fire-retardant addition.FTIR spectrometry showed the formation of non-isocyanate urethane linkages.Thermogravimetric analysis indicated a good thermal resistance of these foams,with thermal degradation following four phases.First in the interval 25℃–120℃ range,mainly evaporation of water occurs with a maximal loss of 10%weight.In the 150℃–450℃ temperature range foams mass loss is of almost 70%.In particular in the 125℃–275℃ range occurs the degradation of some small molecular weight substances.In the 500℃–790℃ temperature range the foams do not present any further large degradation. | Elham Azadeh Xinyi Chen Antonio Pizzi Christine Gérardin Philip Gérardin Hisham Essawy | 2022 | Journal of Renewable Materials2022，10，12： | 0 |
| 6 | Flexible Biofoams Based on Furanics and Fatty Acids Esterified Tannin显示文摘Water repellant,flexible biofoams using tannin esterified with various fatty acid chains,namely lauric,palmitic and oleic acids,by reaction with lauryl chloride,palmitoyl chloride,and oleyl chloride were developed and their characteristics compared with the equivalently esterified rigid biofoams.Glycerol,while initially added to control the reaction temperature,was used as a plasticizer yielding flexible biofoams presenting the same water repellant character that the equivalent rigid foams.Acetaldehyde was used as the cross-linking agent instead of formaldehyde,as it showed a better performance with the esterified tannin.The compression results showed a significant decrease of the Modulus of Elasticity(MOE)of the flexible foams in relation to that of the rigid foams,confirming their flexible character.The lauryl-and palmitoyl-esterified biofoams presented similar mechanical properties,while the oleyl-esterified biofoam presented different mechanical and morphological result not really showing the expected flexibility.Both the esterified rigid and flexible tannin-based biofoams showed good water resistance and their sessile drop contact angle analysis as a function of time confirmed this characteristic.Scanning Electron Microscope(SEM)analysis showed the flexible foams to present a higher proportion of closed cells than the rigid foams.Conversely,the cells depth of the flexible foams was lower than that of the rigid foam.As regards their thermal resistance,the flexible foams showed a slight loss of mass compared to the rigid ones without glycerol.Both types of foams presented much lower surface friability of non-esterified rigid foams. | Elham Azadeh Ummi Hani Abdullah Christine Gerardin Antonio Pizzi Philippe Gerardin Cesar Segovia | 2023 | Journal of Renewable Materials2023，11，10： | 0 |
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