The Experts below are selected from a list of 5013 Experts worldwide ranked by ideXlab platform
Weizhong Yuan - One of the best experts on this subject based on the ideXlab platform.
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environmental friendly and magnetic silanized ethyl cellulose sponges as effective and recyclable oil absorption Materials
Carbohydrate Polymers, 2017Co-Authors: Yeqiang Lu, Yue Wang, Weizhong YuanAbstract:Abstract Ethyl cellulose (EC), owing to its wide availability, environmental-friendliness, and intrinsic hydrophobicity/oleophilicity, was used as an Absorbent Material for the first time. The superhydrophobic magnetic EC sponges with low density and high porosity were facilely prepared via freeze-drying method. The superhydrophobicity and magnetism of the sponges were achieved by silanization EC with hexadecyltrimethoxysilane and mixing with ferroferric oxide (Fe3O4) nanoparticles. The as-prepared magnetic silanized EC (MSEC) sponges showed stable superhydrophobicity (θwater > 150°, rolling contact angle: 7°) in several kinds of solutions. Furthermore, the sponges exhibited high separation efficiency and good mass absorption capacity for a wide variety of oils and organic solvents (37–51 times of their own weight). Benefitting from the robust superhydrophobicity and good self-cleaning property of the sponges, the absorption capacity could be well maintained upon repeated use, demonstrating the superior recyclability. These advantages made the sponges ideal Absorbents for oil spillage cleanup.
Pérez Raposo Álvaro - One of the best experts on this subject based on the ideXlab platform.
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Acoustic absorption increase by placing Absorbent Material in pieces with and without back air layer
SOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society SEA, 2019Co-Authors: Caballol Bartolomé David, Pérez Raposo ÁlvaroAbstract:The reverberation time of a reverberation room with an Absorbent Material is proved against different layouts of the Material and with and without a combination of different back air layers, compared to those results where the same Material is placed as a single piece. With the analysis of the obtained data, a regression model is established in order to predict, for certain frequencies, the improvement produced in the reverberation time of a room, using the same amount of Material by placing it in pieces separated from each other, instead of in one piece, and including different distances from the wall as a variable. It becomes a simple on work predictive tool which allows to estimate the alteration in the reverberation time due to the separation of the patches. The model is validated and proven to be robust and it is shown to be applicable to a variety of Materials. © INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. All Rights Reserved
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Acoustic absorption with Material in pieces and back air layer
'S. Hirzel Verlag', 2019Co-Authors: Caballol Bartolomé David, Pérez Raposo ÁlvaroAbstract:The sound absorption coefficient of three different Materials is proved in a reverberation room against different layouts of the Material and different back air layers, compared to those results where the same Material is placed as a single piece. With the analysis of the data, a linear regression model is established in order to predict, for certain frequencies, the alteration produced in the absorption coefficient by using the same amount of Material but placing it in patches separated from each other, instead of in one piece, and at different distances from the wall. The model is validated and proven to be robust and it is shown to be applicable to a variety of Materials. It becomes a simple predictive tool which allows to estimate in situ the improvement in the absorption property of an Absorbent Material due to the separation of the patches
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Acoustic absorption with Material in pieces and back air layer
'S. Hirzel Verlag', 2019Co-Authors: Caballol Bartolomé David, Pérez Raposo ÁlvaroAbstract:The sound absorption coefficient of three different Materials is proved in a reverberation room against different layouts of the Material and different back air layers, compared to those results where the same Material is placed as a single piece. With the analysis of the data, a linear regression model is established in order to predict, for certain frequencies, the alteration produced in the absorption coefficient by using the same amount of Material but placing it in patches separated from each other, instead of in one piece, and at different distances from the wall. The model is validated and proven to be robust and it is shown to be applicable to a variety of Materials. It becomes a simple predictive tool which allows to estimate in situ the improvement in the absorption property of an Absorbent Material due to the separation of the patches. © S. Hirzel Verlag · EA
Daniela Caschera - One of the best experts on this subject based on the ideXlab platform.
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development of superhydrophobic self cleaning and flame resistant dlc tio2 melamine sponge for application in oil water separation
Journal of Materials Science, 2020Co-Authors: Roberta G Toro, Pietro Calandra, Fulvio Federici, Tilde De Caro, A Mezzi, Barbara Cortese, Anna Lucia Pellegrino, Graziella Malandrino, Daniela CascheraAbstract:Increasing awareness of environmental concerns has strongly pushed the scientific community towards the search for new solutions for efficient removal of oils and organic solvents from water. Here, we report the preparation of multifunctional TiO2-coated melamine-formaldehyde (MF) sponges as Absorbent Material for oils and organic solvents in water. TiO2-coated MF sponges were fabricated through an environmentally friendly approach, consisting in a simple immersion of the sponge into an oleic acid-capped TiO2 nanoparticles dispersion. The adhesion of TiOle coating to the sponge was then improved by the deposition of a low surface energy diamond-like carbon (DLC) thin layer. Our results highlighted that the modified MF sponges possess superhydrophobic and oleophilic behaviour, inertness to corrosive environment, good durability and reusability. Furthermore, the superhydrophobic DLC/TiO2@sponges showed (1) novel self-cleaning properties towards an absorbed commercial organic dye (IR-270BKA, chosen as representative) under visible light irradiation and (2) enhanced flame-retardant behaviour respect to the pristine MF sponge. These findings point out an important added value of DLC/TiOle@sponges making them promising candidates for wastewater treatments.
Kassahun Alemu - One of the best experts on this subject based on the ideXlab platform.
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does menstrual hygiene management and water sanitation and hygiene predict reproductive tract infections among reproductive women in urban areas in ethiopia
PLOS ONE, 2020Co-Authors: Ayechew Ademas, Metadel Adane, Tadesse Sisay, Helmut Kloos, Betelhiem Eneyew, Awoke Keleb, Mistir Lingerew, Atimen Derso, Kassahun AlemuAbstract:Reproductive tract infections (RTIs) are a public health concern in Ethiopia. However, the relationship between menstrual hygiene management (MHM) and water, sanitation, and hygiene (WASH) factors to RTIs have not been well addressed. A community-based cross-sectional study was conducted from January to March 2019 among 602 systematically selected reproductive-age women aged 15-49 years in Dessie City. Data were collected using a questionnaire and a direct observation checklist. RTIs were identified by the presence during one year before data collection of one or more signs of vaginal discharge, itching/irritation or ulcers/lesions around the vulva, pain during urination and sexual intercourse, and lower abdominal pain and lower back pain. Data were analyzed using multivariable logistic regression analysis with 95%CI (confidence interval). The self-reported prevalence of RTIs was 11.0%(95%CI:8.5-13.7%) during one year prior to the survey. The most commonly reported symptoms of RTI were burning micturition (9.1%) and vaginal discharge (6.1%). Three-fourths 443(75.0%) of households used traditional pit latrines and the majority of the study participants 527(89.2%) did not meet the basic access requirement of 20 liters of water per capita per day. The majority 562(95.1%) of the study participants did not have multiple sexual partners during the last year and 97.8% did not practiced sexual intercourse during menstruation. The most common type of blood-Absorbent Material used was a sanitary pad 497(84.8%) followed by cloth 89(15.2%). Factors significantly associated with RTIs were using unclean latrines (AOR: 4.20; 95%CI:2.00-8.80), not washing hands with soap before touching the genital area (AOR: 3.94; 95%CI:1.49-10.45), history of symptoms of RTIs in the past year (AOR: 5.88; 95%CI:2.30-14.98), having multiple sexual partners in the past year (AOR: 4.46; 95%CI:1.59-12.53), changing Absorbent Material only once per day (AOR: 8.99; 95%CI:4.51-17.92), and washing the genital area only once per day during menstruation (AOR: 5.76; 95%CI:2.07-16.05). The self-reported prevalence of RTI showed that one women experienced RTI among ten reproductive-age women. Designing a women's health policy that focuses on ensuring availability of WASH facilities and improving MHM at the community level is key for sustainably preventing RTIs.
Yeqiang Lu - One of the best experts on this subject based on the ideXlab platform.
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environmental friendly and magnetic silanized ethyl cellulose sponges as effective and recyclable oil absorption Materials
Carbohydrate Polymers, 2017Co-Authors: Yeqiang Lu, Yue Wang, Weizhong YuanAbstract:Abstract Ethyl cellulose (EC), owing to its wide availability, environmental-friendliness, and intrinsic hydrophobicity/oleophilicity, was used as an Absorbent Material for the first time. The superhydrophobic magnetic EC sponges with low density and high porosity were facilely prepared via freeze-drying method. The superhydrophobicity and magnetism of the sponges were achieved by silanization EC with hexadecyltrimethoxysilane and mixing with ferroferric oxide (Fe3O4) nanoparticles. The as-prepared magnetic silanized EC (MSEC) sponges showed stable superhydrophobicity (θwater > 150°, rolling contact angle: 7°) in several kinds of solutions. Furthermore, the sponges exhibited high separation efficiency and good mass absorption capacity for a wide variety of oils and organic solvents (37–51 times of their own weight). Benefitting from the robust superhydrophobicity and good self-cleaning property of the sponges, the absorption capacity could be well maintained upon repeated use, demonstrating the superior recyclability. These advantages made the sponges ideal Absorbents for oil spillage cleanup.