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fluoride water

Yucheng Dong, Zhentao Wang, Chaozhong Li
Fluorinated alkenes exhibit very poor reactivity in copolymerization with non-fluorinated polar monomers such as acrylates. Herein we describe a convenient method for the synthesis of poly(vinyl fluoride-co-acrylic acid) and poly(2-fluoropropene-co-methacrylic acid) copolymers. Thus, the silver-catalyzed decarboxylative radical fluorination of poly(acrylic acid) with Selectfluor in water at room temperature affords poly(vinyl fluoride-co-acrylic acid) copolymers in high yields with well-defined molecular weights and polydispersities...
August 17, 2017: Nature Communications
Mengying Long, Shan Peng, Wanshun Deng, Xiaojun Yang, Kai Miao, Ni Wen, Xinrui Miao, Wenli Deng
HYPOTHESIS: Superhydrophobic surfaces easily lose their excellent water-repellency after damages, which limit their broad applications in practice. Thus, the fabrication of superhydrophobic surfaces with excellent durability and thermal healing should be taken into consideration. EXPERIMENTS: In this work, robust superhydrophobic surfaces with thermal healing were successfully fabricated by spin-coating method. To achieve superhydrophobicity, cost-less and fluoride-free polydimethylsiloxane (PDMS) was spin-coated on rough aluminum substrates...
August 10, 2017: Journal of Colloid and Interface Science
Koji Yasuda, Tiffany Hsu, Carey A Gallini, Lauren J Mclver, Emma Schwager, Andy Shi, Casey R DuLong, Randall N Schwager, Galeb S Abu-Ali, Eric A Franzosa, Wendy S Garrett, Curtis Huttenhower, Xochitl C Morgan
Fluoridation of drinking water and dental products prevents dental caries primarily by inhibiting energy harvest in oral cariogenic bacteria (such as Streptococcus mutans and Streptococcus sanguinis), thus leading to their depletion. However, the extent to which oral and gut microbial communities are affected by host fluoride exposure has been underexplored. In this study, we modeled human fluoride exposures to municipal water and dental products by treating mice with low or high levels of fluoride over a 12-week period...
July 2017: MSystems
Rosa Martha Perez Gutierrez, Carlos Hoyo-Vadillo
BACKGROUND: Defense and protection to multiple harmful stimuli are the inflammation, when is self-amplified and uncontrolled is the basis of the pathogenesis of a wide variety of inflammatory illness. The aim of this study was to evaluate if Petiveria alliacea could attenuate inflammation in a murine model of RAW264 macrophages the involved model and its involved mechanism. MATERIALS AND METHODS: The ethanol extract from P. alliacea was precipitated with water and supernatant was used for this study (PW)...
July 2017: Pharmacognosy Magazine
Sonu Kumari, Suphiya Khan
Fluoride (F) contaminated ground water poses a serious public health concern to rural population with unaffordable purification technologies. Therefore, development of a cost-effective, portable, environment and user-friendly defluoridation technique is imperative. In the present study, we report on the development of a green and cost-effective method that utilizes Fe3O4 and Al2O3 nanoparticles (NPs) that were synthesized using jojoba defatted meal. These NPs were impregnated on to polyurethane foam (PUF) and made into tea infusion bags...
August 14, 2017: Scientific Reports
Rozita Jalali, Franck Guy, Samaneh Ghazanfari, Don Lyaruu, Leo van Ruijven, Pamela DenBesten, Stefania Martignon, Gina Castiblanco, Antonius L J J Bronckers
OBJECTIVE: Fluoride excess of 0.05-0.07mgF/kgbw/day in water or food additives like salt is the principal cause of endemic dental fluorosis. How fluoride causes these defects is not clear yet. Recent studies in rodents suggest that development of enamel fluorosis is associated with insufficient neutralization of protons released during the formation of hypermineralized lines. DESIGN: Here we examined whether hypermineralization could also be assessed by MicroCT in developing molar enamel of humans exposed to fluoride...
July 29, 2017: Archives of Oral Biology
Fei Guo, Qiuying Wen, Zhiguang Guo
Green fluoride-free superhydrophobic hierarchical flowerlike iron-containing MnO2 particles were synthesized by a simple one-pot approach and subsequently modified by stearic acid. The special selective wettability toward water and oil makes the particle can be used in oil-in-water emulsion separation. In addition, the particle also can be applied as absorption material to remove dyes which are serious water contaminants. More importantly, as for the mixture of emulsion and dye, the particles also have the ability to remove both oil and dye, making the particles potential for wastewater purification in the future...
August 8, 2017: Journal of Colloid and Interface Science
Dayoung Lee, Chiho Lee, Eun Jin Jun, Minji Lee, Sungnam Park, Juyoung Yoon
A new benzobisimidazolium derivative (1) bearing four naphthalene moieties was synthesized and demonstrated as an F(-) ion-selective fluorescent chemosensor. The fluorescence of 1 in acetonitrile (CH3CN) is significantly stronger with F(-) and acetate (CH3CO2(-)), but not with other anions (Cl(-), Br(-), I(-), HSO4(-), and H2PO4(-)). The fluorescence of 1 is enhanced selectively with F(-) in the presence of a small amount of water. Our DFT calculations indicate that the electrostatic interactions between the positively charged benzobisimidazolium moieties and F(-) play an important role in the formation of stable aggregates...
August 2017: ChemistryOpen
Yutaka Nakahara, Kiyokazu Ozaki, Tetsuro Matsuura
Periodontal disease (PD) in diabetic patients is described as the 6th complication of diabetes. We have previously shown that diabetes increases dental caries, and carious inflammation might have a strong effect on the adjacent periodontal tissue in diabetic rodent models. However, the possibility that hyperglycemia may induce PD in diabetic animals could not be completely eliminated. The goal of this study was to confirm the presence of PD in diabetic animal models by preventing carious inflammation with fluoride administration...
August 9, 2017: Diabetes
Debirupa Mitra, Min Li, En-Tang Kang, Koon-Gee Neoh
Bacteria-contaminated inanimate surfaces within hospitals and clinics result in transmission of pathogens via direct or indirect contact, leading to increased risk of healthcare-associated infections (HAI). The use of antibacterial coatings is a potential way of reducing the bacterial burden, but many surfaces like instrument panels and monitors necessitate the coatings to be transparent while being highly antibacterial. In this work, silica nanoparticles (SiO2 NPs) were first grown over a layer of acrylated quaternized chitosan (AQCS) covalently immobilized on commercially available transparent polyvinyl fluoride (PVF) films...
August 9, 2017: ACS Applied Materials & Interfaces
René Antonio Rocha, Marta Calatayud, Vicenta Devesa, Dinoraz Vélez
Fluoride is an important element for humans. It inhibits initiation and progression of dental caries and stimulates bone formation. However, excessive intake may lead to the appearance of dental and/or skeletal fluorosis and a decrease in intellectual coefficient in child populations. This study evaluates exposure to fluoride in the child population of Chaco province (Argentina) by analysis of drinking water, food and its bioaccessible fraction (quantity of fluoride solubilised by gastrointestinal digestion and available for intestinal absorption) and urine as a biomarker of internal dose...
August 8, 2017: Environmental Science and Pollution Research International
Zhao Wang, Lun Tan, Xumin Pan, Gao Liu, Yahua He, Wenchao Jin, Meng Li, Yongming Hu, Haoshuang Gu
The rapid development of micro-scaled piezoelectric energy harvesters has provided a simple and highly efficient way for building self-powered sensor systems through harvesting the mechanical energy from the ambient environment. In this work, a self-powered microfluidic sensor that can harvest the mechanical energy of the fluid and simultaneously monitor their characteristics was fabricated by integrating the flexible piezoelectric poly(vinylidene fluoride) (PVDF) nanofibers with the well-designed microfluidic chips...
August 7, 2017: ACS Applied Materials & Interfaces
Ali Naghizadeh, Khadijeh Gholami
The aim of this study was to evaluate the effectiveness of montmorillonite and bentonite nanoparticles in removal of fluoride from water solutions. This experimental study has been conducted in batch condition in which the effects of different parameters such as contact time, pH, initial concentration of fluoride and amount of adsorbent mass have been investigated. Finally thermodynamics, isotherm and kinetics of the both adsorbents have been studied. The maximum adsorption capacity for both adsorbents occurred at fluoride concentration of 20 mg/L, contact times of 60 minutes, pH = 3 and adsorbent mass of 0...
August 2017: Journal of Water and Health
Peeyush Khare
This paper investigates the groundwater quality in six major districts of Madhya Pradesh in central India, namely, Balaghat, Chhindwara, Dhar, Jhabua, Mandla, and Seoni during the 2010-2011 sampling campaign, and discusses improvements made in the supplied water quality between the years 2011 and 2017. Groundwater is the main source of water for a combined rural population of over 7 million in these districts. Its contamination could have a huge impact on public health. We analyzed the data collected from a large-scale water sampling campaign carried out by the Public Health Engineering Department (PHED), Government of Madhya Pradesh between 2010 and 2011 during which all rural tube wells and dug wells were sampled in these six districts...
September 2017: Environmental Monitoring and Assessment
Madhnure Pandith, R D Kaplay, S S Potdar, H Sangnor, A D Rao
Rapid expansion in urbanization and industrialization coupled with recent drought conditions has triggered unplanned groundwater development leading to severe stress on groundwater resources in many urban cities of India, particularly cities like Nanded, Maharashtra. In the quest of tapping drinking water requirement, due to recent drought conditions, people from the city are piercing through entire thickness of shallow basalt aquifers to reach productive deeper granite aquifers. Earlier reports from Nanded and surrounding districts suggest that deeper granite aquifer is contaminated with fluoride (geogenic)...
September 2017: Environmental Monitoring and Assessment
Amirfarrokh Farzaneh, Robert F DeJaco, Lindsay Ohlin, Allan Holmgren, J Ilja Siepmann, Mattias Grahn
A promising route for sustainable 1-butanol (butanol) production is ABE (acetone, butanol, ethanol) fermentation. However, recovery of the products is challenging because of the low concentrations obtained in the aqueous solution, thus hampering large-scale production of biobutanol. Membrane and adsorbent-based technologies using hydrophobic zeolites are interesting alternatives to traditional separation techniques (e.g., distillation) for energy-efficient separation of butanol from aqueous mixtures. To maximize the butanol over water selectivity of the material, it is important to reduce the number of hydrophilic adsorption sites...
August 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
G Dhanu, R Shiny, R Havale, S P Shrutha
INTRODUCTION: Dental fluorosis is considered as a serious public health problem in India. Water is usually the major source of fluoride exposure, but this is not the case always as exposure to local factors like diet can be important in some situations. Earlier studies have shown that jowar (a millet) consumption interacts with fluoride in the body and elevate fluorosis. AIM AND OBJECTIVE: To determine the association between jowar consumption and severity of dental fluorosis...
July 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
Leonard A Crocombe, Lynette R Goldberg, Erica Bell, Bastian Seidel
INTRODUCTON: Oral health is fundamental to overall health. Poor oral health is largely preventable but unacceptable inequalities exist, particularly for people in rural areas. The issues are complex. Rural populations are characterised by lower rates of health insurance, higher rates of poverty, less water fluoridation, fewer dentists and oral health specialists, and greater distances to access care. These factors inter-relate with educational, attitudinal, and system-level issues. An important area of enquiry is whether and how national oral health policies address causes and solutions for poor rural oral health...
July 2017: Rural and Remote Health
Eui-Jong Lee, Bhaskar Jyoti Deka, Jiaxin Guo, Yun Chul Woo, Ho Kyong Shon, Alicia Kyoungjin An
To consolidate the position of membrane distillation (MD) as an emerging membrane technology that meets global water challenges, it is crucial to develop membranes with ideal material properties. This study reports a facile approach for a polyvinylidene fluoride (PVDF) membrane surface modification that is achieved through the coating of the surface with poly(dimethylsiloxane) (PDMS) polymeric microspheres to lower the membrane surface energy. The hierarchical surface of the microspheres was built without any assistance of a nano/microcomposite by combining the rapid evaporation of tetrahydrofuran (THF) and the phase separation from condensed water vapor...
August 16, 2017: Environmental Science & Technology
Utsab Manna, Santanu Kayal, Soham Samanta, Gopal Das
A meta-phenylenediamine-based disubstituted bis-urea receptor L1 with electron-withdrawing 3-chloro and electron-donating 4-methylphenyl terminals has been established as a potential system to fix and efficiently capture atmospheric CO2 as air-stable entrapment of an unprecedented {CO3(2-)-(H2O)2-CO3(2-)} cluster (complex 1a) within its tetrameric long straight pillar-like assembly entirely sealed by n-TBA cations via formation of a barrel-type architecture. L1 and its isomeric 4-bromo-3-methyl disubstituted bis-urea receptor L2 have been found to entrap similar kinds of water-free naked sulfate-sulfate double anion (complexes 1b and 2a) by cooperative binding of urea moieties inside the two pairs of the inversion-symmetric linear tetrameric barrel of L1 and L2, respectively...
July 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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