Influence of Hydrothermal Conditions on Ultra-Light Calcium Silicate Material In Situ Strengthened with Xonotlite Whiskers

2013 ◽  
Vol 648 ◽  
pp. 139-142
Author(s):  
Fei Liu ◽  
Ting Li ◽  
Xiao Dan Wang ◽  
Jian Xin Cao
Keyword(s):  
Hydrothermal Synthesis ◽  
Physical Properties ◽  
Calcium Silicate ◽  
Reaction Times ◽  
In Situ Growth ◽  
Silicate Material ◽  
Hydrothermal Conditions ◽  
Hydrothermal Temperature

The ultra-light calcium silicate material was reinforced with the method of xonotlite whisker in-situ growth via hydrothermal synthesis. Effects of different hydrothermal temperatures and reaction times on the microstructure and physical properties of the reinforcement were studied in this paper. The results indicated that the hydrothermal temperatures and times posed great impacts on microstructure of the reinforcement. The increase of hydrothermal temperature and time was beneficial to the growth of xonotlite crystal. The effect of buffer and transfer action of the xonotlite whiskers was the key to reinforcing the ultra-light calcium silicate material.

Effect of the Ratio of Silica Source on Ultra-Light Calcium Silicate Material In Situ Strengthened with Xonotlite Whiskers

2013 ◽  
Vol 648 ◽  
pp. 131-134 ◽  
Author(s):  
Fei Liu ◽  
Ting Li ◽  
Xiao Dan Wang ◽  
Jian Xin Cao
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Hydrothermal Synthesis ◽  
Flexural Strength ◽  
Calcium Silicate ◽  
In Situ Growth ◽  
Silicate Material ◽  
Silica Source ◽  
Microstructure And Mechanical Properties

The ultra-light calcium silicate material was reinforced with the method of xonotlite whisker in-situ growth via hydrothermal synthesis. Effects of different ratios of silica sources on microstructure and mechanical properties of the reinforcement were studied in this paper. The results indicated that the ratios of silica sources posed great impacts on microstructure and mechanical properties of the reinforcement. The reinforcement with density of 118 Kg•m-3, flexural strength of 0.42 MPa and compressive strength of 0.66 MPa was successfully prepared under the condition of K2SiO3:H2SiO3 (mol) =2:1.

scholarly journals Diffusion-induced in situ growth of covalent organic frameworks for composite membranes

2019 ◽  
Vol 7 (45) ◽  
pp. 25802-25807 ◽  
Author(s):  
Priyanka Manchanda ◽  
Stefan Chisca ◽  
Lakshmeesha Upadhyaya ◽  
Valentina-Elena Musteata ◽  
Mark Carrington ◽  
...  
Keyword(s):  
Reaction Times ◽  
Composite Membranes ◽  
Thin Layers ◽  
In Situ Growth ◽  
Covalent Organic Frameworks ◽  
Polymeric Support ◽  
Ambient Conditions ◽  
Induction Method ◽  
Covalent Organic Framework

Thin layers of a covalent organic framework (COF) have been synthesized on a flexible polymeric support using a new diffusion-induction method under ambient conditions in reaction times as short as 3 hours.

Hydrothermal Synthesis and Structure Characterization of Two Hybrid Metal Phosphonates Materials

2015 ◽  
Vol 1088 ◽  
pp. 309-313
Author(s):  
Chang Feng Sun ◽  
Yan Yan Pang ◽  
Ying Zhao ◽  
Yu Yang
Keyword(s):  
Hydrothermal Synthesis ◽  
Structure Characterization ◽  
Hydrothermal Conditions ◽  
Metal Phosphonates ◽  
Two Hybrid

Under hydrothermal conditions, two copper phosphonates, [Cu2(H2O)2(H2L)(bpy)2(H3L)2]·2H2O (1) and [Cu2(H2O)2(H2L)2(phen)2]·6H2O (2) (H4L = p-xylylenediphosphonic acid, bpy = 2,2'-bipyridine and phen = 1,10-phenanthroline), have been synthesized using diethyl p-xylylenediphosphonate (dixdp), in which p-xylylenediphosphonic acid (H4L) was generated via in situ hydrolysis. Complexe 1 forms a zero-dimensional (0D) bimetallic rings, while complex 2 features a 0D structure containing two kinds of partially deprotonated H3L-and H2L2-ligand.

Hydrothermal Synthesis of Walnut-Like α-Ni(OH)2 Architectures and their In Situ Thermal Convention to NiO

2011 ◽  
Vol 412 ◽  
pp. 44-48
Author(s):  
Zhi Rong Suo ◽  
Hui Liu ◽  
Na Wei
Keyword(s):  
Thermal Decomposition ◽  
Polyethylene Glycol ◽  
Hydrothermal Synthesis ◽  
Formation Process ◽  
Hydrothermal Reaction ◽  
Reaction Times ◽  
Thermal Decomposition Process ◽  
Similar Morphology ◽  
Microwave Assisted

The walnut-like α-Ni (OH)2 architectures have been successfully synthesized through a microwave-assisted hydrothermal method using urea as a hydrolysis-controlling agent and polyethylene glycol (PEG) as a surfactant. The NiO architectures with similar morphology were obtained by a simple thermal decomposition process of the precursor α-Ni (OH)2. The as-obtained products were well characterized by XRD, SEM, TEM, and FTIR. The experimental results shown that walnut-like α-Ni (OH)2 architectures with a diameter of 2-6 μm. The formation process of Ni (OH)2 architectures was observed by SEM via different hydrothermal reaction times.

scholarly journals Hydrothermal synthesis of long-chain hydrocarbons up to C24 with NaHCO3-assisted stabilizing cobalt

2021 ◽  
Vol 118 (51) ◽  
pp. e2115059118
Author(s):  
Daoping He ◽  
Xiaoguang Wang ◽  
Yang Yang ◽  
Runtian He ◽  
Heng Zhong ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Hydrothermal Synthesis ◽  
Co Adsorption ◽  
Hydrothermal Systems ◽  
Hydrothermal Conditions ◽  
Hydrocarbon Synthesis ◽  
Emergence Of Life ◽  
Long Chain ◽  
Chain Hydrocarbon

Abiotic CO2 reduction on transition metal minerals has been proposed to account for the synthesis of organic compounds in alkaline hydrothermal systems, but this reaction lacks experimental support, as only short-chain hydrocarbons (<C5) have been synthesized in artificial simulation. This presents a question: What particular hydrothermal conditions favor long-chain hydrocarbon synthesis? Here, we demonstrate the hydrothermal bicarbonate reduction at ∼300 °C and 30 MPa into long-chain hydrocarbons using iron (Fe) and cobalt (Co) metals as catalysts. We found the Co0 promoter responsible for synthesizing long-chain hydrocarbons to be extraordinarily stable when coupled with Fe−OH formation. Under these hydrothermal conditions, the traditional water-induced deactivation of Co is inhibited by bicarbonate-assisted CoOx reduction, leading to honeycomb-native Co nanosheets generated in situ as a new motif. The Fe−OH formation, confirmed by operando infrared spectroscopy, enhances CO adsorption on Co, thereby favoring further reduction to long-chain hydrocarbons (up to C24). These results not only advance theories for an abiogenic origin for some petroleum accumulations and the hydrothermal hypothesis of the emergence of life but also introduce an approach for synthesizing long-chain hydrocarbons by nonnoble metal catalysts for artificial CO2 utilization.

Controllable synthesis, characterization, and electrochemical properties of manganese oxide nanoarchitectures

2008 ◽  
Vol 23 (3) ◽  
pp. 780-789 ◽  
Author(s):  
Lichun Zhang ◽  
Liping Kang ◽  
Hao Lv ◽  
Zhikui Su ◽  
Kenta Ooi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Properties ◽  
Manganese Oxide ◽  
Manganese Oxides ◽  
Hydrothermal Reaction ◽  
Reaction Times ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Hydrothermal Temperature ◽  
Transmission Electron

Flowerlike manganese oxide microspheres and cryptomelane-type manganese oxide nanobelts were selectively synthesized by a simple decomposition of KMnO4 under mild hydrothermal conditions without using template or cross-linking reagents. The effect of varying the hydrothermal times and temperatures on the nanostructure, morphology, compositional, and electrochemical properties of the obtained manganese oxides was investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) studies showed that the flowerlike manganese oxide microspheres could be obtained at relatively low hydrothermal temperatures, while high hydrothermal temperatures were favorable for the formation of cryptomelane-type manganese oxide nanobelts. A morphology and crystalline evolution of the nanostructures was observed as the hydrothermal temperature was increased from 180 to 240 °C. On the basis of changing the temperatures and hydrothermal reaction times, the formation mechanism of cryptomelane-type manganese oxide nanobelts is discussed. Cyclic voltammetry (CV) was used to evaluate the electrochemical properties of the obtained manganese oxide nanostructures, and the results show that the electrochemical properties depend on their shape and crystalline structure. This easily controllable, template-free, and environmentally friendly method has the potential for being used in syntheses of manganese oxide nanomaterials with uniform morphologies and crystal structures.

ChemInform Abstract: In situ Hydrothermal Synthesis of Tetrazole Coordination Polymers with Interesting Physical Properties

ChemInform ◽  
2008 ◽  
Vol 39 (18) ◽  
Author(s):  
Hong Zhao ◽  
Zhi-Rong Qu ◽  
Heng-Yun Ye ◽  
Ren-Gen Xiong
Keyword(s):  
Hydrothermal Synthesis ◽  
Physical Properties ◽  
Coordination Polymers

One-step hydrothermal synthesis of hierarchical Ag/Bi2WO6 composites: In situ growth monitoring and photocatalytic activity studies

2013 ◽  
Vol 56 (4) ◽  
pp. 435-442 ◽  
Author(s):  
Ying Zhou ◽  
Qian Zhang ◽  
YuanHua Lin ◽  
Elena Antonova ◽  
Wolfgang Bensch ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Growth Monitoring ◽  
In Situ Growth ◽  
One Step

In situ growth of SnO2 nanosheets on a substrate via hydrothermal synthesis assisted by electrospinning and the gas sensing properties of SnO2/polyaniline nanocomposites

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74944-74956 ◽  
Author(s):  
Yang Li ◽  
Huitao Ban ◽  
Mingfei Jiao ◽  
Mujie Yang
Keyword(s):  
Hydrothermal Synthesis ◽  
Gas Sensor ◽  
High Performance ◽  
Gas Sensing ◽  
In Situ Growth ◽  
Sensing Properties ◽  
Gas Sensing Properties

In situ preparation of SnO2 nanosheet/polyaniline composite on a substrate and its applications as a high performance gas sensor.

Hydrothermal synthesis, X-ray structure and DFT and magnetic studies of a (H2SiW12O40)2− based one-dimensional linear coordination polymer

2015 ◽  
Vol 44 (19) ◽  
pp. 8824-8832 ◽  
Author(s):  
Masoud Mirzaei ◽  
Hossein Eshtiagh-Hosseini ◽  
Mahboubeh Alipour ◽  
Antonio Bauzá ◽  
Joel T. Mague ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Synthesis And Characterization ◽  
Hydrothermal Conditions ◽  
Magnetic Studies ◽  
One Dimensional ◽  
X Ray ◽  
Organic Hybrid ◽  
Linear Coordination

In this paper, we report the synthesis and characterization of a novel POM-based inorganic–organic hybrid with an in situ transformation of pyridine-2,3-dicarboxylic acid into nicotinic acid and 2-hydroxynicotinic acid under hydrothermal conditions.

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