1
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Bui QB, Nguyen TP, Schwede D. Manually compressed soil blocks stabilised by fly ash based geopolymer: a promising approach for sustainable buildings. Sci Rep 2023; 13:22905. [PMID: 38129554 PMCID: PMC10739806 DOI: 10.1038/s41598-023-50103-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 12/15/2023] [Indexed: 12/23/2023] Open
Abstract
The construction industry is one of the sectors which have significant impacts on the environment. The research on sustainable materials is a demand of society. This paper presents an investigation on the use of fly ash (FA) geopolymer binder for the production of unburnt bricks. First, an optimisation process for the ratio of alkaline activator solution (AAS) and FA was performed. The blocks were obtained by compressing the materials in a mould by hand, similar to the traditional technique of the adobes. Different ratios of AAS in the blocks were investigated: 6%, 8%, 12% and 20% by mass, respectively. Two curing temperatures were tested: ambient temperature and at 60 °C. Then, different properties of the blocks were determined: flexural tensile strength, compressive strengths (in the quasi-dry state and in the saturated state), water absorption. The techniques of Fourier Transform Infrared (FTIR) and Scanning Electron Microscope (SEM) were also used for the analyses of the results obtained. The results showed that the blocks with 20% AAS had highest compressive strengths with an average of 24 MPa at 28 days, while the recommended AAS amount for both technical and economical points of view was 8%, with a mean compressive strength of 13 MPa at 28 days. The ratio between the saturated compressive strength on the quasi-dry compressive strength was higher than 0.5, which satisfied the current exigencies from the standards. These exploratory results are important for practice applications of this type of blocks.
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Affiliation(s)
- Quoc-Bao Bui
- Sustainable Developments in Civil Engineering Research Group, Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
| | - Tan-Phat Nguyen
- Sustainable Developments in Civil Engineering Research Group, Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Dirk Schwede
- Energy and Building Services, Department of Architecture and Civil Engineering, Technische Hochschule Lübeck, Lübeck, Germany
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2
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Acharya GR, Tyagi M, Mamontov E, Hoffmann PM. Diffusion Dynamics of Water and Ethanol in Graphene Oxide. J Phys Chem B 2023; 127:7384-7393. [PMID: 37556231 DOI: 10.1021/acs.jpcb.2c08960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
We utilized the momentum transfer (Q)-dependence of quasi-elastic neutron scattering (QENS) to measure the dynamics of water and ethanol confined in graphene oxide (GO) powder or membranes at different temperatures and in different orientations. We found reduced diffusivities (up to 30% in the case of water) and a depression of dynamic transition temperatures. While water showed near Arrhenius behavior with an almost bulk-like activation barrier in a temperature range of 280-310 K, the diffusivity of ethanol showed little temperature dependence. For both water and ethanol, we found evidence for immobile and mobile fractions of the confined liquid. The mobile fraction exhibited jump diffusion, with a jump length consistent with the expected average spacing of hydroxide groups in the GO surfaces. From anisotropy measurements, we found weak anisotropy in the diffusivity of the mobile species and in the fraction and geometry of immobile species.
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Affiliation(s)
- Gobin Raj Acharya
- Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, P.O. Box 2008 MS6473, Oak Ridge, Tennessee 37831, United States
| | - Peter M Hoffmann
- Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, United States
- Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, Florida 32114, United States
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3
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Kuzielová E, Slaný M, Žemlička M, Másilko J, Palou MT. Phase Composition of Silica Fume-Portland Cement Systems Formed under Hydrothermal Curing Evaluated by FTIR, XRD, and TGA. MATERIALS 2021; 14:ma14112786. [PMID: 34073874 PMCID: PMC8197268 DOI: 10.3390/ma14112786] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/17/2021] [Accepted: 05/20/2021] [Indexed: 12/03/2022]
Abstract
Two substitution levels of Portland cement by silica fume (SF; 30 and 50 mass%) and three hydrothermal treatment regimes (0.5, 1.2, and 2 MPa and 165, 195, and 220 °C for 7 days, respectively) were selected for the investigation of high-temperature phase formation. A combination of thermogravimetric, X-ray diffraction, and Fourier transform infrared analyses in the mid-IR region was used to overcome the shortcomings of individual techniques for the identification of these complex systems. Changes in molecular water amounts, the polymerization degree of silicate chains, or their decomposition due to transformations and crystallization of phases at hydrothermal conditions were observed and discussed concerning composition. Contrary to the calciochondrite, hydrogrossular phases, α-C2SH, and jaffeite detected in the systems without SF, a decrease in CaO/SiO2 ratio resulted in the formation of stable tobermorite in the case of 30 mass% SF, whilst calcium hydrogen silicate, gyrolite, and cowlesite were identified as more thermally stable phases in the samples with 50 mass% SF.
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Affiliation(s)
- Eva Kuzielová
- Institute of Construction and Architecture, Slovak Academy of Sciences, Dúbravská Cesta 9, SK-845 03 Bratislava, Slovakia; (M.S.); (M.Ž.); (M.T.P.)
- Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-812 37 Bratislava, Slovakia
- Correspondence:
| | - Michal Slaný
- Institute of Construction and Architecture, Slovak Academy of Sciences, Dúbravská Cesta 9, SK-845 03 Bratislava, Slovakia; (M.S.); (M.Ž.); (M.T.P.)
- Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská Cesta 9, SK-845 36 Bratislava, Slovakia
| | - Matúš Žemlička
- Institute of Construction and Architecture, Slovak Academy of Sciences, Dúbravská Cesta 9, SK-845 03 Bratislava, Slovakia; (M.S.); (M.Ž.); (M.T.P.)
| | - Jiří Másilko
- Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-612 00 Brno, Czech Republic;
| | - Martin Tchingnabé Palou
- Institute of Construction and Architecture, Slovak Academy of Sciences, Dúbravská Cesta 9, SK-845 03 Bratislava, Slovakia; (M.S.); (M.Ž.); (M.T.P.)
- Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-812 37 Bratislava, Slovakia
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4
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Kupwade-Patil K, Boul PJ, Rasner DK, Lapidus SH, Leao JB, Johnson KD, Thaemlitz CJ, Büyüköztürk O. In situ investigation of phosphonate retarder interaction in oil well cements at elevated temperature and pressure conditions. JOURNAL OF THE AMERICAN CERAMIC SOCIETY. AMERICAN CERAMIC SOCIETY 2020; 103:10.1111/jace.17373. [PMID: 37533536 PMCID: PMC10395400 DOI: 10.1111/jace.17373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 07/08/2020] [Indexed: 08/04/2023]
Abstract
The effect of a high-performance retarding additive in oil well cements was investigated under elevated temperature (165°C) and pressure (1000 psi) conditions via in situ synchrotron-based X-ray diffraction (XRD) and quasielastic neutron scattering (QENS) techniques. Under these temperature and pressure conditions, crystalline calcium silicate hydrates (C-S-H) are formed through the cement hydration process. From in situ XRD experiments, the retardation effect was observed by a change in the rate of the appearance of 11 Å tobermorites as well as a change in the rate of the α-C2SH generation and depletion. QENS analysis revealed that the retardation effect was related to the non-conversion of free water to chemical and constrained water components. A high presence of free water components was attributed to a decrease in 11 Å tobermorites along with slower consumption of the quartz and portlandite phases. Furthermore, QENS results infer that the water molecules experienced confinement in the restricted pore spaces. The retarder inhibited this initial water confinement by slowing the bulk diffusion of free water in the confined region.
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Affiliation(s)
- Kunal Kupwade-Patil
- Laboratory for Infrastructure Science and Sustainability (LISS), Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | | | - Saul H. Lapidus
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL, USA
| | - Juscelino B. Leao
- NIST Center for Neutron Research (NCNR), National Institute of Standards and Technology, Gaithersburg, MD, USA
| | | | | | - Oral Büyüköztürk
- Laboratory for Infrastructure Science and Sustainability (LISS), Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
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Lee T, Kim S, Park SG. Effect of Electrolyzed Alkaline-Reduced Water on the Early Strength Development of Cement Mortar Using Blast Furnace Slag. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E4620. [PMID: 33081301 PMCID: PMC7602973 DOI: 10.3390/ma13204620] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 10/13/2020] [Accepted: 10/14/2020] [Indexed: 11/16/2022]
Abstract
This study evaluated the use of electrolyzed alkaline-reduced water instead of an alkaline activator for the production of a strong cement matrix with a large blast furnace slag replacement ratio. The flexural and compressive strength measurements, X-ray diffraction analysis, and scanning electron microscopy images of the cement matrices produced using electrolyzed alkaline-reduced water and regular tap water, and with blast furnace slag replacement ratios of 30 and 50% were compared to a normal cement matrix. The cement matrix produced using electrolyzed alkaline-reduced water and blast furnace slag exhibited an improved early age strength, where hydrate formation increased on the particle surface. The cement matrix produced using electrolyzed alkaline-reduced water exhibited a high strength development rate of over 90% of ordinary Portland cement (OPC) in BFS30. Therefore, the use of electrolyzed alkaline-reduced water in the place of an alkaline activator allowed for the formation of a very strong cement matrix in the early stages of aging when a large blast furnace slag replacement ratio was used.
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Affiliation(s)
- Taegyu Lee
- Department of Fire and Disaster Prevention, Semyung University, 65 Semyung-ro, Jecheon-si, Chungbuk 27136, Korea;
| | - Suna Kim
- Department of Architectural Engineering, Mokwon University, 88 Doanbukro, Seogu, Daejeon 35349, Korea;
| | - Sun-Gyu Park
- Department of Architectural Engineering, Mokwon University, 88 Doanbukro, Seogu, Daejeon 35349, Korea;
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Mozhdehi AM, Bamoharram FF, Morsali A, Sharifi AH, Sharifi S, Ganjali A. Comprehension of the role of created hydrogen bonds and adsorption energy in polyamide-nanosilica- Keggin hybrid/ water on enhancement of concrete compressive strength: DFT calculations and experimental investigations. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.111912] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Wan F, Larsen FH, Bordallo HN, Foged C, Rantanen J, Yang M. Insight into Nanoscale Network of Spray-Dried Polymeric Particles: Role of Polymer Molecular Conformation. ACS APPLIED MATERIALS & INTERFACES 2018; 10:36686-36692. [PMID: 30211530 DOI: 10.1021/acsami.8b12475] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Poly(lactic- co-glycolic acid) (PLGA) microparticles represent a promising formulation approach for providing steady pharmacokinetic/pharmacodynamic profiles of therapeutic drugs for a long period. Understanding and controlling the supramolecular structure of PLGA microparticles at a molecular level is a prerequisite for the rational design of well-controlled, reproducible sustained-release profiles. Herein, we reveal the role of PLGA molecular conformation in particle formation and drug release. The nanoscale network of PLGA microparticles spray-dried using the solvents with distinct polarities was investigated by using NMR and neutron scattering. By employing chemometric method, we further demonstrate the evolution of nanoscale networks in spray-dried PLGA microparticles upon water absorption. Our results indicate that PLGA molecules form more chain entanglements during spray drying when using the solvents with low polarity, where PLGA molecule adopts a more flexible, extended conformation, resulting in the network being more resistant to water absorption in spray-dried PLGA microparticles. This work underlines the role of PLGA molecular conformation in controlling formation and evolution of nanoscale network of spray-dried PLGA microparticles and will have important consequences in achieving customized drug release from the PLGA microparticles.
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Affiliation(s)
- Feng Wan
- Department of Pharmacy, Faculty of Health and Medical Sciences , University of Copenhagen , Universitetsparken 2 , 2100 Copenhagen , Denmark
| | - Flemming Hofmann Larsen
- Department of Food Science, Faculty of Science , University of Copenhagen , Rolighedsvej 26 , 1958 Frederiksberg C , Denmark
| | - Heloisa Nunes Bordallo
- Niels Bohr Institute , University of Copenhagen , Blegdamsvej 17 , 2100 Copenhagen , Denmark
| | - Camilla Foged
- Department of Pharmacy, Faculty of Health and Medical Sciences , University of Copenhagen , Universitetsparken 2 , 2100 Copenhagen , Denmark
| | - Jukka Rantanen
- Department of Pharmacy, Faculty of Health and Medical Sciences , University of Copenhagen , Universitetsparken 2 , 2100 Copenhagen , Denmark
| | - Mingshi Yang
- Department of Pharmacy, Faculty of Health and Medical Sciences , University of Copenhagen , Universitetsparken 2 , 2100 Copenhagen , Denmark
- Wuya College of Innovation , Shenyang Pharmaceutical University , Wenhua Road 103 , 110016 Shenyang , China
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8
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Berg MC, Benetti AR, Telling MTF, Seydel T, Yu D, Daemen LL, Bordallo HN. Nanoscale Mobility of Aqueous Polyacrylic Acid in Dental Restorative Cements. ACS APPLIED MATERIALS & INTERFACES 2018; 10:9904-9915. [PMID: 29504390 DOI: 10.1021/acsami.7b15735] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hydrogen dynamics in a time range from hundreds of femtoseconds to nanoseconds can be directly analyzed using neutron spectroscopy, where information on the inelastic and quasi-elastic scattering, hereafter INS and QENS, can be obtained. In this study, we applied these techniques to understand how the nanoscale mobility of the aqueous solution of polyacrylic acid (PAA) used in conventional glass ionomer cements (GICs) changes under confinement. Combining the spectroscopic analysis with calorimetric results, we were able to separate distinct motions within both the liquid and the GICs. The QENS analysis revealed that the self-diffusion translational motion identified in the liquid is also visible in the GIC. However, as a result of the formation of the cement matrix and its setting, both translational diffusion and residence time differed from the PAA solution. When comparing the local diffusion obtained for the selected GIC, the only noticeable difference was observed for the slow dynamics associated with the polymer chain. Additionally, over short-term aging, progressive water binding to the polymer chain occurred in one of the investigated GICs. Finally, a considerable change in the density of the GIC without progressive water binding indicates an increased polymer cross-linking. Taken together, our results suggest that accurate and deep understanding of polymer-water binding, polymer cross-linking, as well as material density changes occurring during the maturation process of GIC are necessary for the development of advanced dental restorative materials.
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Affiliation(s)
- Marcella C Berg
- The Niels Bohr Institute , University of Copenhagen , DK-2100 Copenhagen , Denmark
- European Spallation Source ESS ERIC , P.O. Box 176 , SE-221 00 Lund , Sweden
| | - Ana R Benetti
- Department of Odontology, Faculty of Health and Medical Sciences , University of Copenhagen , DK-2200 Copenhagen , Denmark
| | - Mark T F Telling
- ISIS Facility , Rutherford Appleton Laboratory , Chilton, Oxford OX11 0QX , U.K
- Department of Materials , University of Oxford , Parks Road , Oxford OX1 3PH , U.K
| | - Tilo Seydel
- Institut Max von Laue-Paul Langevin , CS 20156 , F-38042 Grenoble , France
| | - Dehong Yu
- Australian Nuclear Science and Technology Organisation , New Illawarra Road , Lucas Heights , New South Wales 2234 , Australia
| | - Luke L Daemen
- Oak Ridge National Laboratory , P.O. Box 2008 , Oak Ridge , Tennessee 37831 , United States
| | - Heloisa N Bordallo
- The Niels Bohr Institute , University of Copenhagen , DK-2100 Copenhagen , Denmark
- European Spallation Source ESS ERIC , P.O. Box 176 , SE-221 00 Lund , Sweden
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Ridi F, Tonelli M, Fratini E, Chen SH, Baglioni P. Water as a Probe of the Colloidal Properties of Cement. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2205-2218. [PMID: 29035549 DOI: 10.1021/acs.langmuir.7b02304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cement is produced by mixing mineral phases based on calcium silicates and aluminates with water. The hydration reaction of the mixture leads to a synthetic material with outstanding properties that can be used as a binder for construction applications. Despite the importance of cement in society, for a long time, the chemical reactions involved in its hydration remained poorly understood as a result of the complexity of hydration processes, nanostructure, and transport phenomena. This feature article reviews the recently obtained results using water as a probe to detail the essential features in the setting process. By examining the peculiar physicochemical properties of water, fundamental information on the evolving inorganic colloid matrix can be deduced, ranging from the fractal nanostructure of the inorganic silicate framework to the transport phenomena inside the developing porosity. A similar approach can be transferred to the investigation of a plethora of other complex systems, where water plays the main role in determining the final structural and transport properties (i.e., biomaterials, hydrogels, and colloids).
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Affiliation(s)
- Francesca Ridi
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence , via della Lastruccia 3-Sesto Fiorentino, I-50019 Florence, Italy
| | - Monica Tonelli
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence , via della Lastruccia 3-Sesto Fiorentino, I-50019 Florence, Italy
| | - Emiliano Fratini
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence , via della Lastruccia 3-Sesto Fiorentino, I-50019 Florence, Italy
| | - Sow-Hsin Chen
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Piero Baglioni
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence , via della Lastruccia 3-Sesto Fiorentino, I-50019 Florence, Italy
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10
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Le P, Fratini E, Chen SH. Hydration-dependent dynamics of water in calcium-silicate-hydrate: A QENS study by global model. Colloids Surf B Biointerfaces 2018; 168:187-192. [PMID: 29409715 DOI: 10.1016/j.colsurfb.2018.01.039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 12/26/2017] [Accepted: 01/20/2018] [Indexed: 10/18/2022]
Abstract
HYPOTHESIS In a saturated cement paste, there are three different types of water: the structural water chemically reacted with cement, the constrained water absorbed to the surface of the pores, and the free water in the center of the pores. Each type has different physicochemical state and unique relation to cement porosity. The different water types have different dynamics which can be detected using quasi-elastic neutron scattering (QENS). Since the porosity of a hardened cement paste is impacted strongly by the water to cement ratio (w/c), it should be possible to extract the hydration dependence of the pores by exploiting the dynamical parameters of the confined water. EXPERIMENTS Three C-S-H samples with different water levels, 8%, 17% and 30% were measured using QENS. The measurements were carried out in the scattering vector, Q, range from 0.5 Å-1 to 1.3 Å-1, and in the temperature interval from 230 K to 280 K. The data were analyzed using a novel global model developed for cement QENS spectra. FINDINGS The results show that while increasing the water content, the structural water index (SWI) decreases and the confining radius, a, increases. Both SWI and a have a linear relationship with the water content. The Arrhenius plot of the translational relaxation time shows that the constrained water dominates the non-structural water at water contents lower than 17%. The rotational activation energy is smaller for lower water content. The analysis demonstrated that our newly proposed global model is practical and useful for analyzing cement QENS data.
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Affiliation(s)
- Peisi Le
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Emiliano Fratini
- Department of Chemistry "Ugo Schiff" and CSGI, University of Florence, Sesto Fiorentino, Florence I-50019, Italy
| | - Sow-Hsin Chen
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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11
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Dynamics of nano-confined water in Portland cement - comparison with synthetic C-S-H gel and other silicate materials. Sci Rep 2017; 7:8258. [PMID: 28811588 PMCID: PMC5557859 DOI: 10.1038/s41598-017-08645-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 07/12/2017] [Indexed: 11/30/2022] Open
Abstract
The dynamics of water confined in cement materials is still a matter of debate in spite of the fact that water has a major influence on properties such as durability and performance. In this study, we have investigated the dynamics of water confined in Portland cement (OPC) at different curing ages (3 weeks and 4 years after preparation) and at three water-to-cement ratios (w/c, 0.3, 0.4 and 0.5). Using broadband dielectric spectroscopy, we distinguish four different dynamics due to water molecules confined in the pores of different sizes of cements. Here we show how water dynamics is modified by the evolution in the microstructure (maturity) and the w/c ratio. The fastest dynamics (processes 1 and 2, representing very local water dynamics) are independent of water content and the degree of maturity whereas the slowest dynamics (processes 3 and 4) are dependent on the microstructure developed during curing. Additionally, we analyze the differences regarding the water dynamics when confined in synthetic C-S-H gel and in the C-S-H of Portland cement.
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12
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Martins ML, Eckert J, Jacobsen H, Dos Santos ÉC, Ignazzi R, de Araujo DR, Bellissent-Funel MC, Natali F, Koza MM, Matic A, de Paula E, Bordallo HN. Probing the dynamics of complexed local anesthetics via neutron scattering spectroscopy and DFT calculations. Int J Pharm 2017; 524:397-406. [PMID: 28366805 DOI: 10.1016/j.ijpharm.2017.03.051] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 03/22/2017] [Accepted: 03/23/2017] [Indexed: 10/19/2022]
Abstract
Since potential changes in the dynamics and mobility of drugs upon complexation for delivery may affect their ultimate efficacy, we have investigated the dynamics of two local anesthetic molecules, bupivacaine (BVC, C18H28N2O) and ropivacaine (RVC, C17H26N2O), in both their crystalline forms and complexed with water-soluble oligosaccharide 2-hydroxypropyl-β-cyclodextrin (HP-β-CD). The study was carried out by neutron scattering spectroscopy, along with thermal analysis, and density functional theory computation. Mean square displacements suggest that RVC may be less flexible in crystalline form than BVC, but both molecules exhibit very similar dynamics when confined in HP-β-CD. The use of vibrational analysis by density functional theory (DFT) made possible the identification of molecular modes that are most affected in both molecules by insertion into HP-β-CD, namely those of the piperidine rings and methyl groups. Nonetheless, the somewhat greater structure in the vibrational spectrum at room temperature of complexed RVC than that of BVC, suggests that the effects of complexation are more severe for the latter. This unique approach to the molecular level study of encapsulated drugs should lead to deeper understanding of their mobility and the respective release dynamics.
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Affiliation(s)
- Murillo L Martins
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5 DK-2100, Copenhagen, Denmark.
| | - Juergen Eckert
- Department of Chemistry, University of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620, United States; Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
| | - Henrik Jacobsen
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5 DK-2100, Copenhagen, Denmark; Department of Physics, Oxford University, Oxford, OX1 3PU, United Kingdom
| | - Éverton C Dos Santos
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5 DK-2100, Copenhagen, Denmark; Department of Physics, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5 NO-7491, Trondheim, Norway
| | - Rosanna Ignazzi
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5 DK-2100, Copenhagen, Denmark
| | - Daniele Ribeiro de Araujo
- Human and Natural Sciences Center Federal University of ABC (UFABC) 09210-170, Santo André, SP, Brazil
| | | | - Francesca Natali
- Institute of Materials, Research National Council (CNR-IOM), Italy; Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, Grenoble Cedex 9, France
| | - Michael Marek Koza
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, Grenoble Cedex 9, France
| | - Aleksander Matic
- Department of Applied Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Eneida de Paula
- Department of Biochemistry and Tissue Biology, State University of Campinas (UNICAMP) 13083-862, Campinas, SP, Brazil
| | - Heloisa N Bordallo
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5 DK-2100, Copenhagen, Denmark; European Spallation Source ESS P.O. Box 176, SE-22100, Lund, Sweden
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13
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Jiao L, Su M, Chen L, Wang Y, Zhu H, Dai H. Natural Cellulose Nanofibers As Sustainable Enhancers in Construction Cement. PLoS One 2016; 11:e0168422. [PMID: 28005917 PMCID: PMC5179083 DOI: 10.1371/journal.pone.0168422] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 11/30/2016] [Indexed: 11/19/2022] Open
Abstract
Cement is one of the mostly used construction materials due to its high durability and low cost, but it suffers from brittle fracture and facile crack initiation. This article describes the use of naturally-derived renewable cellulose nanofibers (CNFs) to reinforce cement. The effects of CNFs on the mechanical properties, degree of hydration (DOH), and microstructure of cement pastes have been studied. It is found that an addition of 0.15% by weight of CNFs leads to a 15% and 20% increase in the flexural and compressive strengths of cement paste. The enhancement in mechanical strength is attributed to high DOH and dense microstructure of cement pastes after adding CNFs.
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Affiliation(s)
- Li Jiao
- Department of Pulp and Paper Engineering, Nanjing Forestry University, Nanjing, Jiangsu, China
- Department of Chemical Engineering, Northeastern University, Boston, United States of America
| | - Ming Su
- Department of Chemical Engineering, Northeastern University, Boston, United States of America
| | - Liao Chen
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, United States of America
| | - Yuangang Wang
- Department of Civil Engineering, Nanjing Forestry University, Nanjing, Jiangsu, China
| | - Hongli Zhu
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, United States of America
| | - Hongqi Dai
- Department of Pulp and Paper Engineering, Nanjing Forestry University, Nanjing, Jiangsu, China
- * E-mail:
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14
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How mobile are protons in the structure of dental glass ionomer cements? Sci Rep 2015; 5:8972. [PMID: 25754555 PMCID: PMC4354011 DOI: 10.1038/srep08972] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 02/12/2015] [Indexed: 01/25/2023] Open
Abstract
The development of dental materials with improved properties and increased longevity can save costs and minimize discomfort for patients. Due to their good biocompatibility, glass ionomer cements are an interesting restorative option. However, these cements have limited mechanical strength to survive in the challenging oral environment. Therefore, a better understanding of the structure and hydration process of these cements can bring the necessary understanding to further developments. Neutrons and X-rays have been used to investigate the highly complex pore structure, as well as to assess the hydrogen mobility within these cements. Our findings suggest that the lower mechanical strength in glass ionomer cements results not only from the presence of pores, but also from the increased hydrogen mobility within the material. The relationship between microstructure, hydrogen mobility and strength brings insights into the material's durability, also demonstrating the need and opening the possibility for further research in these dental cements.
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15
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Monasterio M, Gaitero JJ, Erkizia E, Guerrero Bustos AM, Miccio LA, Dolado JS, Cerveny S. Effect of addition of silica- and amine functionalized silica-nanoparticles on the microstructure of calcium silicate hydrate (C-S-H) gel. J Colloid Interface Sci 2015; 450:109-118. [PMID: 25801139 DOI: 10.1016/j.jcis.2015.02.066] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 02/24/2015] [Accepted: 02/25/2015] [Indexed: 11/16/2022]
Abstract
In this work we study the influence of adding nano-silica (SiO2, Nyasil™) and aminopropyl (-(CH2)3-NH2,) functionalized silica nanoparticles (Stoga) during the synthesis of calcium-silicate-hydrate (C-S-H gel). Characterization by solid state (29)Si NMR and ATR-FTIR spectroscopy showed that the addition of both particle types increases the average length of the silicate chains in C-S-H gel being this effect slightly more important in the case of Stoga particles. In addition, (13)C NMR and XPS confirmed that the aminopropyl chain remains in the final product cleaved to silicon atoms at the end of the silicate chain of C-S-H gel whereas XRD measurements showed that this result in an increment in the basal distance compared with ordinary CSH. In addition, the dynamics of water within the pores of C-S-H gel was analyzed by broadband dielectric spectroscopy. We observed that water confined in C-S-H formed with the addition of nanoparticles is faster than that in plain C-S-H which can be related to a different porous structure in these materials.
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Affiliation(s)
- Manuel Monasterio
- Centro de Fisica de Materiales (CSIC, UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
| | - Juan J Gaitero
- Tecnalia Research & Innovation, Materials, Sustainable Construction Division, c/Geldo, Edificio 700, Parque Tecnológico de Bizkaia, Derio, Spain
| | - Edurne Erkizia
- Tecnalia Research & Innovation, Materials, Sustainable Construction Division, c/Geldo, Edificio 700, Parque Tecnológico de Bizkaia, Derio, Spain; Donostia International Physics Center, 20018 San Sebastián, Spain
| | | | - Luis A Miccio
- Centro de Fisica de Materiales (CSIC, UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
| | - Jorge S Dolado
- Tecnalia Research & Innovation, Materials, Sustainable Construction Division, c/Geldo, Edificio 700, Parque Tecnológico de Bizkaia, Derio, Spain
| | - Silvina Cerveny
- Centro de Fisica de Materiales (CSIC, UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain; Donostia International Physics Center, 20018 San Sebastián, Spain
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16
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Jo BW, Chakraborty S. A mild alkali treated jute fibre controlling the hydration behaviour of greener cement paste. Sci Rep 2015; 5:7837. [PMID: 25592665 PMCID: PMC4296306 DOI: 10.1038/srep07837] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 12/15/2014] [Indexed: 11/09/2022] Open
Abstract
To reduce the antagonistic effect of jute fibre on the setting and hydration of jute reinforced cement, modified jute fibre reinforcement would be a unique approach. The present investigation deals with the effectiveness of mild alkali treated (0.5%) jute fibre on the setting and hydration behaviour of cement. Setting time measurement, hydration test and analytical characterizations of the hardened samples (viz., FTIR, XRD, DSC, TGA, and free lime estimation) were used to evaluate the effect of alkali treated jute fibre. From the hydration test, the time (t) required to reach maximum temperature for the hydration of control cement sample is estimated to be 860 min, whilst the time (t) is measured to be 1040 min for the hydration of a raw jute reinforced cement sample. However, the time (t) is estimated to be 1020 min for the hydration of an alkali treated jute reinforced cement sample. Additionally, from the analytical characterizations, it is determined that fibre-cement compatibility is increased and hydration delaying effect is minimized by using alkali treated jute fibre as fibre reinforcement. Based on the analyses, a model has been proposed to explain the setting and hydration behaviour of alkali treated jute fibre reinforced cement composite.
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Affiliation(s)
- Byung-Wan Jo
- Department of Civil and Environmental engineering, Hanyang University, Seoul, South Korea, 133791
| | - Sumit Chakraborty
- Department of Civil and Environmental engineering, Hanyang University, Seoul, South Korea, 133791
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17
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Monasterio M, Jansson H, Gaitero JJ, Dolado JS, Cerveny S. Cause of the fragile-to-strong transition observed in water confined in C-S-H gel. J Chem Phys 2014; 139:164714. [PMID: 24182071 DOI: 10.1063/1.4826638] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this study, the rotational dynamics of hydration water confined in calcium-silicate-hydrate (C-S-H) gel with a water content of 22 wt.% was studied by broadband dielectric spectroscopy in broad temperature (110-300 K) and frequency (10(-1)-10(8) Hz) ranges. The C-S-H gel was used as a 3D confining system for investigating the possible existence of a fragile-to-strong transition for water around 220 K. Such transition was observed at 220 K in a previous study [Y. Zhang, M. Lagi, F. Ridi, E. Fratini, P. Baglioni, E. Mamontov and S. H. Chen, J. Phys.: Condens. Matter 20, 502101 (2008)] on a similar system, and it was there associated with a hidden critical point of bulk water. However, based on the experimental results presented here, there is no sign of a fragile-to-strong transition for water confined in C-S-H gel. Instead, the fragile-to-strong transition can be explained by a merging of two different relaxation processes at about 220 K.
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Affiliation(s)
- Manuel Monasterio
- Centro de Fisica de Materiales (CSIC, UPV∕EHU)-Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain
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