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Ruiz-Agudo C, Cölfen H. Exploring the Potential of Nonclassical Crystallization Pathways to Advance Cementitious Materials. Chem Rev 2024; 124:7538-7618. [PMID: 38874016 PMCID: PMC11212030 DOI: 10.1021/acs.chemrev.3c00259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 05/31/2024] [Accepted: 06/03/2024] [Indexed: 06/15/2024]
Abstract
Understanding the crystallization of cement-binding phases, from basic units to macroscopic structures, can enhance cement performance, reduce clinker use, and lower CO2 emissions in the construction sector. This review examines the crystallization pathways of C-S-H (the main phase in PC cement) and other alternative binding phases, particularly as cement formulations evolve toward increasing SCMs and alternative binders as clinker replacements. We adopt a nonclassical crystallization perspective, which recognizes the existence of critical intermediate steps between ions in solution and the final crystalline phases, such as solute ion associates, dense liquid phases, amorphous intermediates, and nanoparticles. These multistep pathways uncover innovative strategies for controlling the crystallization of binding phases through additive use, potentially leading to highly optimized cement matrices. An outstanding example of additive-controlled crystallization in cementitious materials is the synthetically produced mesocrystalline C-S-H, renowned for its remarkable flexural strength. This highly ordered microstructure, which intercalates soft matter between inorganic and brittle C-S-H, was obtained by controlling the assembly of individual C-S-H subunits. While large-scale production of cementitious materials by a bottom-up self-assembly method is not yet feasible, the fundamental insights into the crystallization mechanism of cement binding phases presented here provide a foundation for developing advanced cement-based materials.
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Affiliation(s)
- Cristina Ruiz-Agudo
- Physical Chemistry, Department of Chemistry, University of Konstanz, Universitätsstr. 10, 78457 Konstanz, Germany
| | - Helmut Cölfen
- Physical Chemistry, Department of Chemistry, University of Konstanz, Universitätsstr. 10, 78457 Konstanz, Germany
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2
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Cheng L, Zhou Y, Zhang H, Xiao S, Li W, Chen W. The influence of the molecular chain length of PVA on the toughening mechanism of calcium silicate hydrates. Phys Chem Chem Phys 2024; 26:9399-9412. [PMID: 38444367 DOI: 10.1039/d3cp05000a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
In recent years, polymers have been demonstrated to effectively toughen cementitious materials. However, the mechanism of interaction between the polymers and C-S-H at the nanoscale remains unclear, and the quantitative impact of the polymer chain length on toughening effectiveness is lacking in research. This study employs molecular dynamics techniques to examine the impact of the polyvinyl alcohol (PVA) chain length on the tensile performance and toughening mechanism of C-S-H. The toughening effect in both the X and Z directions exhibits an initial enhancement followed by a decline with increasing chain length. The optimal degrees of polymerization are determined to be 8 and 12 in the X and Z directions, respectively, resulting in an improvement of fracture energy by 146.7% and 29.5%, respectively. During the stretching process along the X and Z axes, the chain length of PVA molecules significantly influences the variation in the number of Ca⋯O bonds in the system, leading to different stress responses. Additionally, PVA molecules form C-O-Si bonds with the silicate layers of C-S-H, bridging the adjacent layers in a left-right or up-down manner. The toughening effect of PVA on C-S-H depends on the behavior of PVA molecules with different chain lengths, and there exists an optimal range of chain length for PVA, enabling it to enhance structural uniformity and adjust its own conformation to absorb strain energy. When the length of PVA molecular chains is too short, it can easily cause stress concentration in the system and its connection with silicates is not significant. Conversely, when the length of PVA molecular chains is too long, the large molecular structure restricts its extension in the defects of C-S-H, and as the stretching progresses, PVA molecules break and form numerous small segments, thereby losing the advantage of the chain length. This study provides a theoretical basis for the ability of polymers to toughen cementitious materials.
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Affiliation(s)
- Luqing Cheng
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Nanjing 211103, China.
| | - Yang Zhou
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Nanjing 211103, China.
| | - Hao Zhang
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Nanjing 211103, China.
| | - Shuai Xiao
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Nanjing 211103, China.
| | - Weihuan Li
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Nanjing 211103, China.
| | - Wentao Chen
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Nanjing 211103, China.
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3
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Men HJ, Huang BJ, Li JC. Effect of Interfacial Modification on the Low-Temperature Fatigue Properties of Polymer/MXene Flexible Pressure Sensors. ACS APPLIED MATERIALS & INTERFACES 2024; 16:7489-7499. [PMID: 38299787 DOI: 10.1021/acsami.3c15243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
Maintaining an excellent force-electric response under cyclic bending at low temperatures is still challenging for resistive-type electrically conductive polymer composite-based pressure sensors. In this study, the effect of low temperature on the fatigue failure of flexible MXene/polymer pressure sensors was systematically investigated through the silane functionalization of MXene nanosheets embedded with different polymer matrixes. The results show that the MXene/polymer interfaces are the primary factors affecting the temperature-dependent bending fatigue of the Cu/MXene/polymer/Cu sensor. Using finite element analysis and theoretical calculations, we reveal that the MXene/polymer interfaces are affected by free volume changes and the molecular chain motion under different temperatures. At room temperature, the well-distributed free volume in the polydimethylsiloxane (PDMS) matrix permits local segmental mobility that promotes the affinity between the polymer and MXene. As the temperature decreases, the free volume in the matrix shrinks with less space left for molecular chains to slide relatively, weakening the polymer/MXene interfacial bonding strength. However, for PDMS/MXene sensors with the interface modified using the silane coupling agent KH550, the nanoconstrained structure formed by strong hydrogen bonds and covalent bonds at the PDMS/MXene interface can hinder the mobility of polymer chains, which greatly helps to dissipate the inter/intrachain friction. It thus alleviates the debonding energy dissipation during cyclic bending at subzero temperatures.
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Affiliation(s)
- Hai-Jiao Men
- Vacuum and fluid engineering research center, School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, P. R. China
| | - Bing-Jing Huang
- Vacuum and fluid engineering research center, School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, P. R. China
| | - Jian-Chang Li
- Vacuum and fluid engineering research center, School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, P. R. China
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4
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Zhao H, Yang Y, Shu X, Qiao M, Dong L, Ran Q. Computational Simulations of Adsorption Behavior of Anionic Surfactants at the Portlandite-Water Interface under Sulfate and Calcium Ions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 38335537 DOI: 10.1021/acs.langmuir.3c03914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/12/2024]
Abstract
The adsorption behaviors of two kinds of anionic surfactants (called HSO4 and HPO4, respectively) with different negatively charged hydrophilic head groups (sulfate and phosphate groups) under different concentrations of sulfate and calcium ions at the portlandite-water interface are investigated by molecular dynamics simulations. Although the adsorption strength of HPO4 is much greater than that of HSO4, the desorption energy of HSO4 is slightly greater at an early stage of desorption due to a more perpendicular orientation and denser packing of hydrophobic tail chains. After adding ions, the sulfate ion has a significant weakening effect due to competitive adsorption, and the negative influence of the calcium ion is weaker, and it even slightly promotes the adsorption at low concentration. Due to the stronger electrostatic interaction of phosphate head groups with the portlandite surface, adsorption strength and adsorption stability for HPO4 are always greater than that of HSO4 under the interference of sulfate ions. The competitive adsorption of the sulfate ion significantly weakens the interaction of hydrophilic head groups with portlandite and the dense packing of two surfactants. The calcium ion with low concentration approaches the portlandite surface and acts as an ion bridge to slightly enhance the adsorption of the surfactant. The ion bridging effect is stronger in the HPO4 system than in the HSO4 system.
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Affiliation(s)
- Hongxia Zhao
- School of Material Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing, Jiangsu 210008, China
| | - Yong Yang
- School of Material Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing, Jiangsu 210008, China
| | - Xin Shu
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing, Jiangsu 210008, China
| | - Min Qiao
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing, Jiangsu 210008, China
| | - Lei Dong
- School of Material Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China
| | - Qianping Ran
- School of Material Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing, Jiangsu 210008, China
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5
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Gill WA, Alhokbany N, Janjua MRSA. Adsorption of molecular hydrogen on Be 3Al 2(SiO 3) 6-beryl: theoretical insights for catalysis, hydrogen storage, gas separation, sensing, and environmental applications. RSC Adv 2024; 14:3782-3789. [PMID: 38274172 PMCID: PMC10809057 DOI: 10.1039/d3ra07480c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 01/12/2024] [Indexed: 01/27/2024] Open
Abstract
Employing a combination of Density Functional Theory (DFT) calculations and Molecular Dynamics (MD) simulations, the adsorption of molecular hydrogen (H2) on Be3Al2(SiO3)6-beryl, a prominent silicate mineral, has been studied. The crystal structure of beryl, which consists of interconnected tetrahedral and octahedral sites, provides a fascinating framework for comprehending H2 adsorption behavior. Initial investigation of the interaction between H2 molecules and the beryl surface employed DFT calculations. We identified favorable adsorption sites and gained insight into the binding mechanism through extensive structural optimizations and energy calculations. H2 molecules preferentially adsorb on the exposed oxygen atoms surrounding the octahedral sites, producing weak van der Waals interactions with the beryl surface, according to our findings. To further investigate the dynamic aspects of H2 adsorption, MD simulations employing a suitable force field were conducted. To precisely represent interatomic interactions within the Be3Al2(SiO3)6-beryl-H2 system, the force field parameters were meticulously parameterized. By subjecting the system to a variety of temperatures, we were able to obtain valuable information about the stability, diffusion, and desorption kinetics of H2 molecules within the beryl structure. The comprehensive understanding of the H2 adsorption phenomenon on Be3Al2(SiO3)6-beryl is provided by the combined DFT and MD investigations. The results elucidate the mechanisms underlying H2 binding, highlighting the role of surface oxygen atoms and the effect of temperature on H2 dynamics. This research contributes to a fundamental understanding of hydrogen storage and release in beryllium-based silicates and provides valuable guidance for the design and optimization of materials for hydrogen storage, catalysis, gas separation, sensing and environmental applications.
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Affiliation(s)
- Waqas Amber Gill
- Departamento de Química Física, Universidad de Valencia Avda Dr Moliner, 50, E-46100 Burjassot Valencia Spain
| | - Norah Alhokbany
- Department of Chemistry, King Saud University Riyadh 11451 Saudi Arabia
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6
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Zhang Z, Tao Z, Zhang Y, Wu L, Liao S, Zhao Z, Ghafar WA. Molecular dynamics study on the interaction of phosphorus building gypsum /surfactant composites. J Mol Graph Model 2024; 126:108650. [PMID: 37871455 DOI: 10.1016/j.jmgm.2023.108650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 09/27/2023] [Accepted: 10/06/2023] [Indexed: 10/25/2023]
Abstract
While surfactants are widely used in phosphogypsum, their interactions with the phosphogypsum-water interface remain unclear. This study investigates the impact of three types of surfactants, namely polycarboxylate-based surfactant (PCE-TPEG), naphthalene-based surfactant (NS), and melamine-based surfactant (MS), on the performance of phosphorus building gypsum (PBG). Additionally, a nanoscale model of the PBG-surfactant-water interface is constructed using molecular dynamics to elucidate the mechanisms underlying the interaction between different surfactants and PBG at multiple scales. The results demonstrate that all surfactants enhance the mechanical properties of PBG. PCE-TPEG exhibits the most pronounced improvement. In the model, PCE-TPEG molecules likely undergo comb-like adsorption, while NS and MS molecules tend to adsorb on both ends of the crystal plane. Changes in the potential difference between CaSO4·2H2O and H2O, as well as between CaSO4·2H2O and the surfactant, play a crucial role in adsorption. PCE-TPEG, NS, and MS molecules tend to spread horizontally in a vacuum state. With the addition of water molecules, they transition to spatial adsorption. Ca2+ easily interacts with -COO- and -SO3- groups, leading to reduced migration and flexibility of the main chain. The adsorption process of surfactants at the gypsum-water interface occurs spontaneously and Electrostatic forces are the main driving factor. This study contributes to a more comprehensive understanding on the behaviour of the phosphorus building gypsum/surfactant composites.
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Affiliation(s)
- Zhiqi Zhang
- Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, 650500, China; Yunnan Seismic Engineering Technology Research Center, Kunming University of Science and Technology, Kunming, 650500, China
| | - Zhong Tao
- Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, 650500, China; Yunnan Seismic Engineering Technology Research Center, Kunming University of Science and Technology, Kunming, 650500, China.
| | - Yi Zhang
- Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, 650500, China; Yunnan Seismic Engineering Technology Research Center, Kunming University of Science and Technology, Kunming, 650500, China
| | - Lei Wu
- Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, 650500, China; Yunnan Seismic Engineering Technology Research Center, Kunming University of Science and Technology, Kunming, 650500, China
| | - Shixiong Liao
- Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, 650500, China
| | - Zhiman Zhao
- Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, 650500, China; Yunnan Ningchuang Environmental Technology Co., Ltd., Anning, 650300, China
| | - Wahab Abdul Ghafar
- Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, 650500, China; Yunnan Seismic Engineering Technology Research Center, Kunming University of Science and Technology, Kunming, 650500, China
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7
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Nguyen MT, Fernandez CA, Haider MM, Chu KH, Jian G, Nassiri S, Zhang D, Rousseau R, Glezakou VA. Toward Self-Healing Concrete Infrastructure: Review of Experiments and Simulations across Scales. Chem Rev 2023; 123:10838-10876. [PMID: 37286529 DOI: 10.1021/acs.chemrev.2c00709] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Cement and concrete are vital materials used to construct durable habitats and infrastructure that withstand natural and human-caused disasters. Still, concrete cracking imposes enormous repair costs on societies, and excessive cement consumption for repairs contributes to climate change. Therefore, the need for more durable cementitious materials, such as those with self-healing capabilities, has become more urgent. In this review, we present the functioning mechanisms of five different strategies for implementing self-healing capability into cement based materials: (1) autogenous self-healing from ordinary portland cement and supplementary cementitious materials and geopolymers in which defects and cracks are repaired through intrinsic carbonation and crystallization; (2) autonomous self-healing by (a) biomineralization wherein bacteria within the cement produce carbonates, silicates, or phosphates to heal damage, (b) polymer-cement composites in which autonomous self-healing occurs both within the polymer and at the polymer-cement interface, and (c) fibers that inhibit crack propagation, thus allowing autogenous healing mechanisms to be more effective. In all cases, we discuss the self-healing agent and synthesize the state of knowledge on the self-healing mechanism(s). In this review article, the state of computational modeling across nano- to macroscales developed based on experimental data is presented for each self-healing approach. We conclude the review by noting that, although autogenous reactions help repair small cracks, the most fruitful opportunities lay within design strategies for additional components that can migrate into cracks and initiate chemistries that retard crack propagation and generate repair of the cement matrix.
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Affiliation(s)
| | | | - Md Mostofa Haider
- University of California, Davis, One Shield Avenue, Davis, California 95616, USA
| | - Kung-Hui Chu
- Zachry Department of Civil and Environmental Engineering, Texas A&M University, College Station, Texas 77843, USA
| | - Guoqing Jian
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Somayeh Nassiri
- University of California, Davis, One Shield Avenue, Davis, California 95616, USA
| | - Difan Zhang
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Roger Rousseau
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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8
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Zhou Y, Xiao S, Cheng L, Chen Y, Tang J, She W. A toughening mechanism of the strain rate-optimal chain length on polymer-modified calcium silicate hydrates (CSH). Phys Chem Chem Phys 2023; 25:24097-24109. [PMID: 37655461 DOI: 10.1039/d3cp01743e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Polymers are known to effectively improve the toughness of inorganic matrices; however, the mechanism at the molecular level is still unclear. In this study, we used molecular dynamics simulations to unravel the effects and mechanisms of different molecular chain lengths of polyacrylic acid (PAA) on toughening calcium silicate hydrate (CSH), which is the basic building block of cement-based materials. Our simulation results indicate that an optimal molecular chain length of polymers contributes to the largest toughening effect on the matrix, leading to up to 60.98% increase in fracture energy. During the uniaxial tensile tests along the x-axis and z-axis direction, the configuration evolution of the PAA molecule determines the toughening effect. As the polymer unfolds and its size matches the defects of CSH, the stress distribution of the system becomes more homogeneous, which favors an increase in toughness. Furthermore, based on our simulation results and a mathematical model, we propose a theory of "strain rate/optimal chain length". This theory suggests that the optimal toughening effect can be achieved when the molecular chain length of the organic component is 1.3-1.5 times the largest defect size of the inorganic matrix. This work provides molecular-scale insights into the toughening mechanisms of an organic/inorganic system and may have practical implications for improving the toughness of cement-based materials.
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Affiliation(s)
- Yang Zhou
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co, Nanjing 211103, China
| | - Shuai Xiao
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co, Nanjing 211103, China
| | - Luqing Cheng
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co, Nanjing 211103, China
| | - Yuan Chen
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co, Nanjing 211103, China
| | - JinHui Tang
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co, Nanjing 211103, China
| | - Wei She
- School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu 211189, China.
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co, Nanjing 211103, China
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9
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Kai MF, Li G, Yin BB, Akbar A. Aluminum-induced structure evolution and mechanical strengthening of calcium silicate hydrates: an atomistic insight. CONSTRUCTION AND BUILDING MATERIALS 2023; 393:132120. [DOI: 10.1016/j.conbuildmat.2023.132120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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10
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Chen Y, Zheng Y, Zhou Y, Zhang W, Li W, She W, Liu J, Miao C. Multi-layered cement-hydrogel composite with high toughness, low thermal conductivity, and self-healing capability. Nat Commun 2023; 14:3438. [PMID: 37301895 DOI: 10.1038/s41467-023-39235-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 06/02/2023] [Indexed: 06/12/2023] Open
Abstract
The inherent quasi-brittleness of cement-based materials, due to the disorder of their hydration products and pore structures, present significant challenges for directional matrix toughening. In this work, a rigid layered skeleton of cement slurry was prepared using a simplified ice-template method, and subsequently flexible polyvinyl alcohol hydrogel was introduced into the unidirectional pores between neighboring cement platelets, resulting in the formation of a multi-layered cement-based composite. A toughness improvement of over 175 times is achieved by the implantation of such hard-soft alternatively layered microstructure. The toughening mechanism is the stretching of hydrogels at the nano-scale and deflections of micro-cracks at the interfaces, which avoid stress concentration and dissipate huge energy. Furthermore, this cement-hydrogel composite also exhibits a low thermal conductivity (around 1/10 of normal cement) and density, high specific strength and self-healing properties, which can be used in thermal insulation, seismic high-rise buildings and long-span bridges.
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Affiliation(s)
- Yuan Chen
- Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Yangzezhi Zheng
- School of Transportation, Southeast University, Nanjing, 211189, China
| | - Yang Zhou
- Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China.
| | - Wei Zhang
- Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China.
| | - Weihuan Li
- Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Wei She
- Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Jiaping Liu
- Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
| | - Changwen Miao
- Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China
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11
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Molecular dynamics study on the interaction of tricalcium silicate/polymer composites. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.140193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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12
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Yong F, Yuan L, Chen Z, Dajing Q, Chao W, PeiYan W. Nano-CaCO 3 enhances PVA fiber-matrix interfacial properties: an experimental and molecular dynamics study. MOLECULAR SIMULATION 2022. [DOI: 10.1080/08927022.2022.2094373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Feng Yong
- College of Civil Engineering, Henan University of Technology, Zhengzhou, People’s Republic of China
| | - Li Yuan
- College of Civil Engineering, Henan University of Technology, Zhengzhou, People’s Republic of China
| | - Zhao Chen
- Department of Hydraulic Engineering, Henan Vocational College of Water Conservancy and Environment, Zhengzhou, People’s Republic of China
| | - Qin Dajing
- College of Civil Engineering, Henan University of Technology, Zhengzhou, People’s Republic of China
| | - Wang Chao
- College of Civil Engineering, Henan University of Technology, Zhengzhou, People’s Republic of China
| | - Wang PeiYan
- College of Civil Engineering, Henan University of Technology, Zhengzhou, People’s Republic of China
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13
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Effect of a Novel Vibration Mixing on the Fiber Distribution and Mechanical Properties of Ultra-High Performance Concrete. SUSTAINABILITY 2022. [DOI: 10.3390/su14137920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A novel double-axis vibration mixing technology is presented to further enhance the performance of ultra-high performance concrete (UHPC). It improves the problem of inefficient zone in concrete mixing and enhances the homogeneity of concrete through the coupling of vibration and velocity fields during mixing. The X-CT scan results demonstrate that this novel technology improves the fiber distribution coefficient from 0.512 to 0.581. Moreover, the standard deviation of fiber orientation is reduced, the proportion of invalid fibers is decreased, and the pore space distribution is more uniform. The mechanical experimental results show that the new vibration mixing technology improves the mechanical properties of UHPC, and the percentage of early strength improvement is more significant; the impact compressive strength and the toughness of UHPC are also strengthened. The vibration mixing technology is expected to achieve the reduction of raw materials dosage with the same mechanical properties to reduce the cost and carbon emission.
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14
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Luo Q, Huang J. Mechanisms and Critical Technologies of Transport Inhibitor Agent (TIA) throughout C-S-H Nano-Channels. MATERIALS 2022; 15:ma15020515. [PMID: 35057230 PMCID: PMC8780887 DOI: 10.3390/ma15020515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/30/2021] [Accepted: 01/04/2022] [Indexed: 12/04/2022]
Abstract
The critical issue of the durability of marine concrete lies in the continuous penetration and rapid enrichment of corrosive ions. Here a new ion transfer inhibitor, as TIA, with calcium silicate hydrate (C-S-H) interfacial affinity and hydrophobicity is proposed through insights from molecular dynamics into the percolation behavior of the ion solution in C-S-H nano-channels and combined with molecular design concepts. One side of the TIA can be adsorbed on the surface of the cement matrix and can form clusters of corrosive ions to block the gel pores so as to resist the ion solution percolation process. Its other side is structured as a hydrophobic carbon chain, similar to a door hinge, which can stick to the matrix surface smoothly before the erosion solution is percolated. It can then change into a perpendicular chain shape to reduce the percolation channel’s diameter and thereby inhibit the percolation when ions meet the inhibitor. Therefore, once the erosion solution contacts TIA, it can quickly chelate with calcium ions and erosion ions at the interface to form clusters and compact pores. In addition, the water absorption, chloride migration coefficient, and chloride content of concrete samples decreased significantly after adding TIA, proving that TIA can effectively enhance the durability of cement-based materials. The structure–activity relationship of ion transfer that is proposed can provide new ideas for solving the critical problems of durability of cement-based materials and polymer molecular design.
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Affiliation(s)
- Qi Luo
- School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;
- Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing 211189, China
| | - Jiale Huang
- School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;
- Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing 211189, China
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Nanjing 211103, China
- Correspondence:
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15
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Shang S, Liu Y, Liu M, Bai Y, Wang X, Wu B, Chen J, Dong J, Liu Y. Studying the adsorption mechanisms of nanoplastics on covalent organic frameworks via molecular dynamics simulations. JOURNAL OF HAZARDOUS MATERIALS 2022; 421:126796. [PMID: 34388925 DOI: 10.1016/j.jhazmat.2021.126796] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 07/25/2021] [Accepted: 07/29/2021] [Indexed: 06/13/2023]
Abstract
Covalent organic frameworks (COFs) with well-defined supramolecular structures and high surface-area-to-volume ratio have received extensive attention on their adsorption of contaminants from micro- to nano-size. Here, we studied the adsorption mechanisms of three typical nanoplastics (NP), including polyethylene (PE), nylon-6 (PA 6), and polyethylene terephthalate (PET) on chemically stable COFs (TpPa-X, X = H, CH3, OH, NO2 and F) by molecular dynamics simulations. Depending on molecular structure and surface composition, two distinct interactions-electrostatic interaction and van der Waals (vdW) interaction-are identified to be responsible for the adsorption of different NP pollutants on TpPa-X. The vdW interaction is dominant during the adsorption process, while polar groups in polymers and COFs can enhance the adsorption because of the electrostatic interaction. Compared with other functional COFs, we found that TpPa-OH shows the strongest adsorption with the NP pollutants employed in this study. This work reveals the COF-polymer adsorption behavior and properties at atomic scale, which is crucial to the development of promising COF materials to deal with NP pollution.
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Affiliation(s)
- Shengcong Shang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Youxing Liu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Minghui Liu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yichao Bai
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Xinyu Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Bin Wu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Jianyi Chen
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
| | - Jichen Dong
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yunqi Liu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
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16
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Bílek V, Hrubý P, Iliushchenko V, Koplík J, Kříkala J, Marko M, Hajzler J, Kalina L. Experimental Study of Slag Changes during the Very Early Stages of Its Alkaline Activation. MATERIALS 2021; 15:ma15010231. [PMID: 35009376 PMCID: PMC8746217 DOI: 10.3390/ma15010231] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/21/2021] [Accepted: 12/27/2021] [Indexed: 11/30/2022]
Abstract
The very early stages of alkaline activation of slag control its rheology and setting, but also affect its hydration, which occurs later. Simultaneously, these parameters are dictated by the nature and dose of the alkaline activator. Therefore, we investigated and compared the changes in slag particles (SEM, BET, laser diffraction), as well as in the pore solution composition (ICP–OES), pH, and conductivity, of alkali-activated slag (AAS) pastes containing the three most common sodium activators (waterglass, hydroxide, and carbonate) and water during the first 24 h of its activation. To ensure the best possible comparability of the pastes, a fairly nontraditional mixture design was adopted, based on the same concentration of Na+ (4 mol/dm3) and the same volume fraction of slag in the paste (0.50). The results were correlated with the pastes’ hydration kinetics (isothermal calorimetry), structural build-up (oscillatory rheology), and setting times (Vicat). Great differences were observed in most of these properties, in the formation of hydration products, and in the composition of the pore solution for each activator. The results emphasize the role of the anionic groups in the activators and of the pH, which help predict the sample’s behavior based on its calorimetric curve, and offer data for further comparisons and for the modelling of AAS hydration for specific activators.
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17
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Ye W, Hao J, Gao C, Xu Q, Zhu M, Liao R. Molecular insights into the liquid-solid behaviour of hydrocarbon and ester insulating liquids with cellulose polymer insulation. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117986] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Heydari M, Sharif F, Ebrahimi M. Bioinspired pressure-sensitive adhesive: evaluation of the effect of dopamine methacrylamide comonomer as a general property modifier using molecular dynamics simulation. RSC Adv 2021; 11:20557-20569. [PMID: 35479894 PMCID: PMC9033950 DOI: 10.1039/d1ra03634c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 05/25/2021] [Indexed: 01/02/2023] Open
Abstract
The use of catechol-containing comonomers as a general property enhancer to achieve unique properties has received particular attention for designing bioinspired polymeric materials. In this study, molecular dynamics simulation was used to investigate the role of dopamine methacrylamide (DMA) and N-phenethyl methacrylamide (PMA) comonomers in chain conformation and their effects on the mechanical properties and adhesion of poly(n-butyl acrylate-co-acrylic acid) copolymer. Addition of 4% by weight of DMA comonomer in the terpolymer structure reduces the gyration radius of the poly(n-butyl acrylate-co-acrylic acid) copolymer. This reduction is due to the formation of intramolecular hydrogen bond interactions. A further increase in the DMA up to 12.2% by weight increases the radius of gyration by 5%. The effect of PMA on the gyration radius of the poly(n-butyl acrylate-co-acrylic acid) copolymer is more extensive, compared to DMA. While DMA enhances both van der Waals and electrostatic components of the cohesive energy density through increasing π–π interactions and hydrogen bond formations, PMA only improves the van der Waals component. Assessment of mechanical properties revealed that the addition of DMA comonomer resulted in a transition from brittle to tough behavior in poly(n-butyl acrylate-co-acrylic acid) pressure-sensitive adhesive. Ductility index improvement by DMA is higher than that by PMA. DMA comonomers accumulate on the silica surface resulting in the terpolymer chains approaching the dry silica surface from the hydroxyl groups of the catechol. Accumulation of DMA only enhances the cohesive energy and does not improve the adhesive energy. The use of catechol-containing comonomers as a general property enhancer to achieve unique properties has received particular attention for designing bioinspired polymeric materials.![]()
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Affiliation(s)
- Mahmoud Heydari
- Department of Polymer Engineering and Color Technology, Amirkabir University of Technology Tehran 15875-4413 Iran
| | - Farhad Sharif
- Department of Polymer Engineering and Color Technology, Amirkabir University of Technology Tehran 15875-4413 Iran
| | - Morteza Ebrahimi
- Department of Polymer Engineering and Color Technology, Amirkabir University of Technology Tehran 15875-4413 Iran
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19
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Wang X, Xie W, Ren J, Zhu J, Li LY, Xing F. Interfacial Binding Energy between Calcium-Silicate-Hydrates and Epoxy Resin: A Molecular Dynamics Study. Polymers (Basel) 2021; 13:polym13111683. [PMID: 34064107 PMCID: PMC8196693 DOI: 10.3390/polym13111683] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/15/2021] [Accepted: 05/18/2021] [Indexed: 11/16/2022] Open
Abstract
Microcapsules encapsulated within epoxy as a curing agent have been successfully applied in self-healing materials, in which the healing performance significantly depends on the binding behaviour of the epoxy curing agent with the cement matrix. In this paper, the binding energy was investigated by molecular dynamics simulation, which could overcome the shortcomings of traditional microscopic experimental methods. In addition to the construction of different molecular models of epoxy, curing agents, and dilutants, seven models were established to investigate the effects of chain length, curing agent, and epoxy resin chain direction on the interfacial binding energy. The results showed that an increase of chain length exhibited had limited effect on the binding energy, while the curing agent and the direction of the epoxy significantly affected the interfacial binding energy. Among different factors, the curing agent tetrethylenepentamine exhibited the highest value of interfacial binding energy by an increment of 31.03 kcal/mol, indicating a better binding ability of the microcapsule core and the cement matrix. This study provides a microscopic insight into the interface behaviour between the microcapsule core and the cement matrix.
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Affiliation(s)
- Xianfeng Wang
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; (X.W.); (W.X.); (F.X.)
| | - Wei Xie
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; (X.W.); (W.X.); (F.X.)
| | - Jun Ren
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; (X.W.); (W.X.); (F.X.)
- Harbin Institute of Technology, School of Science, Shenzhen 518055, China
- Correspondence: (J.R.); (J.Z.)
| | - Jihua Zhu
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; (X.W.); (W.X.); (F.X.)
- Correspondence: (J.R.); (J.Z.)
| | - Long-Yuan Li
- School of Engineering, University of Plymouth, Plymouth PL4 8AA, UK;
| | - Feng Xing
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; (X.W.); (W.X.); (F.X.)
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20
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Roy JK, Pinto HP, Leszczynski J. Interaction of epoxy-based hydrogels and water: A molecular dynamics simulation study. J Mol Graph Model 2021; 106:107915. [PMID: 33862576 DOI: 10.1016/j.jmgm.2021.107915] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Revised: 03/19/2021] [Accepted: 03/30/2021] [Indexed: 10/21/2022]
Abstract
Biomaterials play a crucial role in tissue engineering as a functional replacement, regenerative medicines, supportive scaffold for guided tissue growth, and drug delivery devices. The term biomaterial refers to metals, ceramics, and polymers account for the vast majority. In the case of polymers, hydrogels have emerged as active materials for an immense variety of applications. Epoxy-based hydrogels possess a unique network structure that enables very high levels of hydrophilicity and biocompatibility. Hydrogel such as Medipacs Epoxy Polymers (MEPs) models were constructed to understand water's behavior at the water/hydrogel interface and hydrogel network. We computed the Gibbs dividing surface (GDS) to define the MEP/water interface, and all the physicochemical properties were computed based on GDS. We calculated the radial distribution function (RDF), the 2D surface roughness of the immersed MEPs. RDF analysis confirmed that the first hydration shell is at a distance of 1.86 Å, and most of the water molecules are near the hydroxyl group of the MEPs network. Hydrogen bonds (H-bonds) analysis was performed, and the observation suggested that the disruption of the H-bonds between MEP chains leads to an increase in the polymer matrix's void spaces. These void spaces are filled with diffused water molecules, leading to swelling of the MEP hydrogel. The swelling parameter was estimated from the fitted curve of the yz-lattice of the simulation cell. The MEP/water interface simulation results provide insightful information regarding the design strategy of epoxy-based hydrogel and other hydrogels vital for biomedical applications.
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Affiliation(s)
- Juganta K Roy
- Interdisciplinary Center for Nanotoxicity, Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA.
| | - Henry P Pinto
- Interdisciplinary Center for Nanotoxicity, Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA; CompNano Group, School of Physical Sciences and Nanotechnology, Yachay Tech University, Urcuqui, 10019, Ecuador.
| | - Jerzy Leszczynski
- Interdisciplinary Center for Nanotoxicity, Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA.
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21
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Zhao H, Yang Y, Song S, Shu X, Chen W, Jin W, Ran Q. Adsorption Conformation of Comb-Shaped Polycarboxylate Ethers on Ettringite (100) Surface: An Atomic Scales Simulation. JOURNAL OF COMPUTATIONAL BIOPHYSICS AND CHEMISTRY 2020. [DOI: 10.1142/s2737416521500071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The adsorption of five polycarboxylate ethers (PCEs) oligomers with different side-chain number and side-chain length on the ettringite (100) surface in explicit solution is studied by all-atom molecular dynamics (MD) simulations. The adsorption conformations, adsorption energies, the radial distribution functions (RDF) between PCEs and ettringite surface and density distribution profile of water perpendicular to the substrate are analyzed. After dynamic equilibrium, negatively charged carboxylate groups are absorbed on the surface of the disordered ettringite crystal and the side-chains are extended to solution. The influence of the number of side-chain on the adsorption strength of PCEs on the ettringite (100) surface is more significant than that of the length of side-chain. The less number of grafted side-chains, the weaker electrostatic shielding, the electrostatic interaction between PCEs and ettringite (100) surface is stronger, which is favorable for the adsorption. The conformation of adsorbed PCEs is closely related to the length of side chain. The greater the length of side-chains is, the larger will be the coverage area of PCE on surface and the degree of water reduction. The mechanism of adsorption of PCEs on ettringite surface is concluded and the major contribution to the adsorption includes ion pairs, hydrogen bonds and an entropic compensation.
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Affiliation(s)
- Hongxia Zhao
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing, 210008, Jiangsu, P. R. China
| | - Yong Yang
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing, 210008, Jiangsu, P. R. China
| | - Shenyou Song
- Shenzhen-Zhongshan Link Administration Center, Zhongshan, 528400, Guangdong, P. R. China
| | - Xin Shu
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing, 210008, Jiangsu, P. R. China
| | - Weile Chen
- Shenzhen-Zhongshan Link Administration Center, Zhongshan, 528400, Guangdong, P. R. China
| | - Wenliang Jin
- Shenzhen-Zhongshan Link Administration Center, Zhongshan, 528400, Guangdong, P. R. China
| | - Qianping Ran
- State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Sobute New Materials Co., Ltd., Nanjing, 210008, Jiangsu, P. R. China
- School of Material Science and Engineering, Southeast University, Nanjing 211189, Jiangsu, P. R. China
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22
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Lou Y, Ji J, Qin A, Liao L, Li Z, Chen S, Zhang K, Ou J. Cane Molasses Graphene Quantum Dots Passivated by PEG Functionalization for Detection of Metal Ions. ACS OMEGA 2020; 5:6763-6772. [PMID: 32258911 PMCID: PMC7114702 DOI: 10.1021/acsomega.0c00098] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 02/19/2020] [Indexed: 06/11/2023]
Abstract
Poly(ethylene glycol) passivated graphene quantum dots (PEG-GQDs) were synthesized based on a green and effective strategy of the hydrothermal treatment of cane molasses. The prepared PEG-GQDs, with an average size of 2.5 nm, exhibit a brighter blue fluorescence and a higher quantum yield (QY) (up to approximately 21.32%) than the QY of GQDs without surface passivation (QY = 10.44%). The PEG-GQDs can be used to detect and quantify paramagnetic transition-metal ions including Fe3+, Cu2+, Co2+, Ni2+, Pb2+, and Mn2+. In the case of ethylenediaminetetraacetic acid (EDTA) solution as a masking agent, Fe3+ ions can be well selectively determined in a transition-metal ion mixture, following the lowest limit of detection (LOD) of 5.77 μM. The quenching mechanism of Fe3+ on PEG-GQDs belongs to dynamic quenching. Furthermore, Fe3+ in human serum can be successfully detected by the PEG-GQDs, indicating that the green prepared PEG-GQDs can be applied as a promising candidate for the selective detection of Fe3+ in clinics.
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Affiliation(s)
- Ying Lou
- Key
Lab New Processing Technology for Nonferrous Metals & Materials
Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Jianying Ji
- Key
Lab New Processing Technology for Nonferrous Metals & Materials
Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Aimiao Qin
- Key
Lab New Processing Technology for Nonferrous Metals & Materials
Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Lei Liao
- College
of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Ziyuan Li
- College
of Chemistry and Bioengineering, Guilin
University of Technology, Guilin 541004, P. R. China
| | - Shuoping Chen
- Key
Lab New Processing Technology for Nonferrous Metals & Materials
Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Kaiyou Zhang
- Key
Lab New Processing Technology for Nonferrous Metals & Materials
Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
| | - Jun Ou
- Key
Lab New Processing Technology for Nonferrous Metals & Materials
Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
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23
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Ren Z, Guo R, Bi H, Jia X, Xu M, Cai L. Interfacial Adhesion of Polylactic Acid on Cellulose Surface: A Molecular Dynamics Study. ACS APPLIED MATERIALS & INTERFACES 2020; 12:3236-3244. [PMID: 31869208 DOI: 10.1021/acsami.9b20101] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Interfacial bonding and adhesion mechanisms are important in determining the final properties of the polymer composite. Molecular dynamics (MD) simulations have been used to characterize the interfacial structure and adhesion behavior of crystalline cellulose planes in contact with polylactic acid. The structure of the PLA at the interface exhibits a shape that can accommodate the structure of the cellulose surface. The adhesion between the PLA and the cellulose surface is affected by the polarity of the functional groups and the surface roughness. The improved adhesion is primarily due to hydrogen bonds formed between the cellulose and PLA molecular chains. Cellulose planes with higher molecular protrusions and greater surface roughness produce stronger adhesion to PLA due to enhanced hydrogen bonding. This study provides a basic insight into the interfacial mechanisms of PLA and cellulose surfaces at the molecular level.
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Affiliation(s)
- Zechun Ren
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Rui Guo
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Hongjie Bi
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Xin Jia
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Min Xu
- Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) , Northeast Forestry University , Harbin 150040 , China
| | - Liping Cai
- Mechanical and Energy Engineer Department , University of North Texas , Demon , Texas 76201 , United States
- College of Materials Science and Engineering , Nanjing Forestry University , Nanjing 210037 , China
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24
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Ching WY, Poudel L, San S, Baral K. Interfacial Interaction between Suolunite Crystal and Silica Binding Peptide for Novel Bioinspired Cement. ACS COMBINATORIAL SCIENCE 2019; 21:794-804. [PMID: 31710806 DOI: 10.1021/acscombsci.9b00131] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Cement and concrete have been important construction materials throughout human history. There is an urgent need to explore novel and untraditional cementitious materials to enhance the durability of building materials and structures in response to increased infrastructure demand worldwide. We report an exploratory study on a biocomposite cement based on a large-scale computational study using density functional theory. An explicitly solvated mixture of a mineral calcium silicate hydrate (C-S-H) crystal suolunite (Ca2Si2O5(OH)2·H2O) and a silicon binding peptide with amino acid sequence PRO-PRO-PRO-TRP-LEU-PRO-TYR-MET-PRO-PRO-TRP-SER is constructed using ab initio molecular dynamics (AIMD). Detailed analysis on the interface structure, interatomic bonding, mechanical properties, and solvent effect of this model reveals a complex interplay of different types of covalent and ionic bonding, including ubiquitous hydrogen bonding which plays a crucial role in their properties. The use of the total bond order density (TBOD), a single quantum mechanical metric, for assessing the interfacial cohesion for this composite biocement is proposed. We find that the solvated model has a slightly larger TBOD than the dried one. These results could lead to a systematic search and rational design for different types of bioinspired and hybrid functional materials with other inorganic minerals and organic peptides.
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Affiliation(s)
- Wai-Yim Ching
- Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, Missouri 64110, United States
| | - Lokendra Poudel
- Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, Missouri 64110, United States
| | - Saro San
- Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, Missouri 64110, United States
| | - Khagendra Baral
- Department of Physics and Astronomy, University of Missouri-Kansas City, Kansas City, Missouri 64110, United States
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25
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Cao W, Zong S, Zhang Y, Qiu F, Tang J, Wu Z, Luan J. Preparation of a novel bone wax with modified tricalcium silicate cement and BGs. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 99:979-985. [PMID: 30889773 DOI: 10.1016/j.msec.2019.02.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2018] [Revised: 01/15/2019] [Accepted: 02/14/2019] [Indexed: 10/27/2022]
Abstract
Amino-grafted and vaterite-contained tricalcium silicate cement (A-V-C3S) was composited with 58S bioglass/chitosan/carboxy methyl cellulose (BG/CS/CMC, referred as BGs) to surmount the non-absorbability and infection problems of traditional bone wax. Its material, bioactive, biocompatible and antibacterial properties were systematically characterized. The results revealed that A-V-C3S/BGs possessed self-setting, injectable, mechanical and degradable abilities. A-V-C3S/BGs (1:1 g/g) was optimum owing to its higher compressive strength (9.91 MPa) and lower pH value (7.6 to 8.1) in the test groups. In vitro immersion experiment demonstrated that A-V-C3S/BGs had good hydroxyapatite formation ability, and its excellent cell adhesion, low cytotoxicity and superior cell proliferation were verified by mouse embryonic osteoblast precursor cells in cell tests. Compared with A-V-C3S, antibacterial experiment illustrated the significantly enhanced antibacterial property of A-V-C3S/BGs to Staphylococcus aureus and Escherichia coli.
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Affiliation(s)
- Weijing Cao
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
| | - Shouyang Zong
- Department of Clinical Laboratory, People's Hospital of Jinhu Country, China
| | - Yin Zhang
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China; Nanjing Haoqi Advanced Materials Co., Ltd., Nanjing 211300, China.
| | - Fan Qiu
- Department of Nuclear Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, China; The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Science, Nanjing University, Nanjing 210093, China
| | - Jun Tang
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
| | - Zhenning Wu
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
| | - Jiapan Luan
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
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26
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Zhou Y, Hou D, Geng G, Feng P, Yu J, Jiang J. Insights into the interfacial strengthening mechanisms of calcium-silicate-hydrate/polymer nanocomposites. Phys Chem Chem Phys 2018. [PMID: 29528060 DOI: 10.1039/c8cp00328a] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanical properties of organic/inorganic composites can be highly dependent on the interfacial interactions. In this work, with organic polymers intercalated into the interlayer of inorganic calcium silicate hydrate (C-S-H), the primary binding phase of Portland cement, great ductility improvement is obtained for the nanocomposites. Employing reactive molecular dynamics, the simulation results indicate that strong interfacial interactions between the polymers and the substrate contribute greatly to strengthening the materials, when C-S-H/poly ethylene glycol (PEG), C-S-H/poly acrylic acid (PAA), and C-S-H/poly vinyl alcohol (PVA) were subject to uniaxial tension along different lattice directions. In the x and z direction tensile processes, the Si-OCa bonds of the C-S-H gel, which were elongated and broken to form Si-OH and Ca-OH, play a critical role in loading resistance, while the incorporation of polymers bridged the neighboring silicate sheets, and activated more the hydrolytic reactions at the interfaces to avoid strain localization, thus increasing the tensile strength and postponing the fracture. On the other hand, Si-O-Si bonds of C-S-H mainly take the load when tension was applied along the y direction. During the post-yield stage, rearrangements of silicate tetrahedra occurred to prevent rapid damage. The polymer intercalation further elongates this post-yield period by forming interfacial Si-O-C bonds, which promote rearrangements and improve the connectivity of the defective silicate morphology, significantly improving the ductility. Among the polymers, PEG exhibits the strongest interaction with C-S-H, and thus C-S-H/PEG possesses the highest ductility. We expect that the molecular-scale mechanisms interpreted here will shed new light on the stress-activated chemical interactions at the organic/inorganic interfaces, and help eliminate the brittleness of cement-based materials on a genetic level.
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Affiliation(s)
- Yang Zhou
- Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China and Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, USA and State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Nanjing 211103, China
| | - Dongshuai Hou
- Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China.
| | - Guoqing Geng
- Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, USA and Laboratory for Waste Management, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Pan Feng
- Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
| | - Jiao Yu
- Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China.
| | - Jinyang Jiang
- Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
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