Article(id=1319236453956170208, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319236433387303232, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20220003, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1641052800000, receivedDateStr=2022-01-02, revisedDate=1641916800000, revisedDateStr=2022-01-12, acceptedDate=null, acceptedDateStr=null, onlineDate=1792460080851, onlineDateStr=2026-10-20, pubDate=1660924800000, pubDateStr=2022-08-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792460080851, onlineIssueDateStr=2026-10-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792460080851, creator=13701087609, updateTime=1792460080851, updator=13701087609, issue=Issue{id=1319236433387303232, tenantId=1146029695717560320, journalId=1263187385517883426, year='2022', volume='50', issue='8', pageStart='2067', pageEnd='2350', issueExtLink='null', onlineDate='null', pubDate='1660924800000', pubDateStr='2022-08-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792460075946, creator='13701087609', updateTime=1792460621958, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1319238723569569958, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319236433387303232, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1319238723569569959, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319236433387303232, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=2221, endPage=2229, ext={EN=ArticleExt(id=1319236454174274017, articleId=1319236453956170208, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Microstructure of Magnesium Silicate Hydrates in Long Curing Age, columnId=1263922769897599102, journalTitle=Journal of the Chinese Ceramic Society, columnName=Research Articles, runingTitle=null, highlight=null, articleAbstract=

The microstructure of magnesium silicate hydrates pastes in different Mg/Si molar ratios was investigated by X-ray diffraction, Fourier transform infrared spectroscopy, solid-state nuclear magnetic resonance and thermogravimetric analysis, respectively. The results reveal that the formed magnesium silicate hydrates (M-S-H) is a main structure of layered tetrahedra with some chain tetrahedra and branching chain tetrahedra. The layered tetrahedra is dominated by Q3a at a higher Mg/Si molar ratio, and the layered tetrahedra is Q3b at a lower Mg/Si molar ratio. The contents of Q1, Q2 and Q3, especially Q2 in the system of MgO-SiO2-H2O, all increase as the Mg/Si molar ratio increases. Also, the content of magnesium hydroxide (MH) increases, the content of unreacted Q4 silica decreases rapidly, the degree of hydration reaction increases, the degree of gel order and the degree of gel polymerization decrease. At a long age, the decomposition rate of MH increases, and the complexity of the gel structure increases, and the prolonged hydration time is conducive to the formation of diversified layered silicon-oxygen tetrahedral structures and the occurrence of M-S-H polymerization. The water structures of M-S-H are free, confined and structural water. The hydroxyl group is bonded with Mg2+ ions or combined with adsorbed water. Chain tetrahedra and branching chain tetrahedra are linked to hydroxyl groups, but Q3 silicate sites are not directly linked to hydroxyl groups. The molar ratio of Mg and Si or structural water and Si in a gel is a fixed value.

, authors=Jianmin XIAO, Yaru HU, authorsList=Jianmin XIAO, Yaru HU, authorCompany=null, correspAuthors=null, authorNote=

XIAO Jianmin (1988-), female, Engineer, Master. E-mail:

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利用X射线衍射分析、Fourier变换红外光谱、固体核磁共振和热重分析技术对长龄期下不同Mg/Si摩尔比的水化硅酸镁试样进行微观结构研究,旨在为深入表征水化硅酸镁凝胶(M-S-H)提供一定技术支撑和理论基础。结果表明:M-S-H主体为层状硅氧四面体结构,包含部分端链和支链硅氧四面体,富镁条件下M-S-H层状结构以Q3a为主,贫镁条件下以Q3b为主。随着Mg/Si摩尔比增大,MgO-SiO2-H2O体系中M-S-H凝胶Q1、Q2、Q3含量均增多,其中Q2增幅最大,Mg(OH)2(MH)含量增大,未反应的Q4silica含量迅速降低,水化反应程度提高,凝胶有序度下降,凝胶聚合度降低。长龄期条件MH解离速度增大,凝胶结构复杂度增大;延长龄期有利于层状硅氧四面体结构多样化的形成,有助于M-S-H聚合反应的发生。M-S-H凝胶中水分子以自由水、结合水和结构水形式存在,结构水中,羟基与Mg2+键合或与吸附水结合,端链硅氧四面体和支链硅氧四面体与羟基直接相连,层状硅氧四面体未直接与羟基键合,凝胶中Mg与Si以及结构水与Si的摩尔比为固定值。

, authors=肖建敏, 胡亚茹, authorsList=肖建敏, 胡亚茹, authorCompany=null, correspAuthors=null, authorNote=

肖建敏(1988—),女,工程师,硕士。

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肖建敏(1988—),女,工程师,硕士。

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长龄期下水化硅酸镁凝胶微观结构
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肖建敏 , 胡亚茹
硅酸盐学报 | 研究论文 2022,50(8): 2221-2229
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硅酸盐学报 |研究论文 2022 , 50 (8) : 2221 -2229
长龄期下水化硅酸镁凝胶微观结构
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肖建敏 , 胡亚茹
作者信息
  • 西安建筑科技大学材料科学与工程学院,西安 710055
作者简介:

肖建敏(1988—),女,工程师,硕士。

Microstructure of Magnesium Silicate Hydrates in Long Curing Age
Jianmin XIAO , Yaru HU
Affiliations
  • College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
  • XIAO Jianmin (1988-), female, Engineer, Master. E-mail:

出版时间: 2022-08-20 doi: 10.14062/j.issn.0454-5648.20220003
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利用X射线衍射分析、Fourier变换红外光谱、固体核磁共振和热重分析技术对长龄期下不同Mg/Si摩尔比的水化硅酸镁试样进行微观结构研究,旨在为深入表征水化硅酸镁凝胶(M-S-H)提供一定技术支撑和理论基础。结果表明:M-S-H主体为层状硅氧四面体结构,包含部分端链和支链硅氧四面体,富镁条件下M-S-H层状结构以Q3a为主,贫镁条件下以Q3b为主。随着Mg/Si摩尔比增大,MgO-SiO2-H2O体系中M-S-H凝胶Q1、Q2、Q3含量均增多,其中Q2增幅最大,Mg(OH)2(MH)含量增大,未反应的Q4silica含量迅速降低,水化反应程度提高,凝胶有序度下降,凝胶聚合度降低。长龄期条件MH解离速度增大,凝胶结构复杂度增大;延长龄期有利于层状硅氧四面体结构多样化的形成,有助于M-S-H聚合反应的发生。M-S-H凝胶中水分子以自由水、结合水和结构水形式存在,结构水中,羟基与Mg2+键合或与吸附水结合,端链硅氧四面体和支链硅氧四面体与羟基直接相连,层状硅氧四面体未直接与羟基键合,凝胶中Mg与Si以及结构水与Si的摩尔比为固定值。

水化硅酸镁  /  长龄期  /  微观结构  /  凝胶水分子

The microstructure of magnesium silicate hydrates pastes in different Mg/Si molar ratios was investigated by X-ray diffraction, Fourier transform infrared spectroscopy, solid-state nuclear magnetic resonance and thermogravimetric analysis, respectively. The results reveal that the formed magnesium silicate hydrates (M-S-H) is a main structure of layered tetrahedra with some chain tetrahedra and branching chain tetrahedra. The layered tetrahedra is dominated by Q3a at a higher Mg/Si molar ratio, and the layered tetrahedra is Q3b at a lower Mg/Si molar ratio. The contents of Q1, Q2 and Q3, especially Q2 in the system of MgO-SiO2-H2O, all increase as the Mg/Si molar ratio increases. Also, the content of magnesium hydroxide (MH) increases, the content of unreacted Q4 silica decreases rapidly, the degree of hydration reaction increases, the degree of gel order and the degree of gel polymerization decrease. At a long age, the decomposition rate of MH increases, and the complexity of the gel structure increases, and the prolonged hydration time is conducive to the formation of diversified layered silicon-oxygen tetrahedral structures and the occurrence of M-S-H polymerization. The water structures of M-S-H are free, confined and structural water. The hydroxyl group is bonded with Mg2+ ions or combined with adsorbed water. Chain tetrahedra and branching chain tetrahedra are linked to hydroxyl groups, but Q3 silicate sites are not directly linked to hydroxyl groups. The molar ratio of Mg and Si or structural water and Si in a gel is a fixed value.

magnesium silicate hydrates  /  long curing age  /  microstructure  /  water in the gel
肖建敏, 胡亚茹. 长龄期下水化硅酸镁凝胶微观结构. 硅酸盐学报, 2022 , 50 (8) : 2221 -2229 . DOI: 10.14062/j.issn.0454-5648.20220003
Jianmin XIAO, Yaru HU. Microstructure of Magnesium Silicate Hydrates in Long Curing Age[J]. Journal of the Chinese Ceramic Society, 2022 , 50 (8) : 2221 -2229 . DOI: 10.14062/j.issn.0454-5648.20220003
  • 陕西省自然科学基金基础研究计划项目(2021JQ-500)
  • 国家重点研发计划课题(2017YFB0309903-03)
  • 陕西省教育厅重点科学研究计划(20JS079)
  • 陕西省教育厅一般专项科学研究计划(20JK0727)
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doi: 10.14062/j.issn.0454-5648.20220003
  • 接收时间:2022-01-02
  • 首发时间:2026-10-20
  • 出版时间:2022-08-20
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  • 收稿日期:2022-01-02
  • 修回日期:2022-01-12
基金
陕西省自然科学基金基础研究计划项目(2021JQ-500)
国家重点研发计划课题(2017YFB0309903-03)
陕西省教育厅重点科学研究计划(20JS079)
陕西省教育厅一般专项科学研究计划(20JK0727)
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    西安建筑科技大学材料科学与工程学院,西安 710055
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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