Mechanochemical Behavior of BaNd2Ti4O12Powder in Ball Milling for High κ Microwave Applications

Mu, Jing; Shi, Yunlong; Yuan, Feng; Liu, J.

doi:10.1002/9781118511350.ch14

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…According to Lisovsky [ 26 ] and Mu et al [ 29 ], a wetting liquid can spread on the particles and penetrate into the 3D mesh structure of ceramics in a few seconds, even under static conditions. However, in ceramic membranes, the spreading phenomenon is affected also by the membrane pore size ( Figure 2 ).…”

Section: Resultsmentioning

confidence: 99%

Advanced Material-Ordered Nanotubular Ceramic Membranes Covalently Capped with Single-Wall Carbon Nanotubes

et al. 2018

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Advanced ceramic materials with a well-defined nano-architecture of their surfaces were formed by applying a two-step procedure. Firstly, a primary amine was docked on the ordered nanotubular ceramic surface via a silanization process. Subsequently, single-wall carbon nanotubes (SWCNTs) were covalently grafted onto the surface via an amide building block. Physicochemical (e.g., hydrophobicity, and surface free energy (SFE)), mechanical, and tribological properties of the developed membranes were improved significantly. The design, preparation, and extended characterization of the developed membranes are presented. Tools such as high-resolution transmission electron microscopy (HR-TEM), single-area electron diffraction (SAED) analysis, microscopy, tribology, nano-indentation, and Raman spectroscopy, among other techniques, were utilized in the characterization of the developed membranes. As an effect of hydrophobization, the contact angles (CAs) changed from 38° to 110° and from 51° to 95° for the silanization of ceramic membranes 20 (CM20) and CM100, respectively. SWCNT functionalization reduced the CAs to 72° and 66° for ceramic membranes carbon nanotubes 20 (CM-CNT-20) and CM-CNT-100, respectively. The mechanical properties of the developed membranes improved significantly. From the nanotribological study, Young’s modulus increased from 3 to 39 GPa for CM-CNT-20 and from 43 to 48 GPa for pristine CM-CNT-100. Furthermore, the nanohardness increased by about 80% after the attachment of CNTs for both types of ceramics. The proposed protocol within this work for the development of functionalized ceramic membranes is both simple and efficient.

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Section: Resultsmentioning

confidence: 99%

Advanced Material-Ordered Nanotubular Ceramic Membranes Covalently Capped with Single-Wall Carbon Nanotubes

et al. 2018

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“…Water molecules wet a ceramic sample and subsequently penetrate into the three-dimensional mesh structure of the ceramics (Figure S1, SEM photo of 5 kDa and 300 kDa). Eq was used for the calculation of liquid depth penetration . The measurements were based on the dynamic contact angle measurements (Figure ): where: χ, depth of liquid penetration [m]; d p , pore size [m]; γ LV , liquid vapor surface tension [mN m –1 ]; CA, contact angle [deg]; t , time [s]; η, solvent viscosity [Pa s].…”

Section: Results and Discussionmentioning

confidence: 99%

“…Eq 1 was used for the calculation of liquid depth penetration. 31 The measurements were based on the dynamic contact angle measurements (Figure 1): In Figure 1, the relation between apparent water contact angle and depth of liquid penetration into ceramic structure of the membrane is presented. It was shown that in the case of 5 kDa hydrophilic membrane, deposited water can penetrate through the whole membrane structure.…”

Section: Resultsmentioning

confidence: 99%

Molecular Grafting of Fluorinated and Nonfluorinated Alkylsiloxanes on Various Ceramic Membrane Surfaces for the Removal of Volatile Organic Compounds Applying Vacuum Membrane Distillation

Kujawa

Al‐Gharabli

Kujawski

et al. 2017

ACS Appl. Mater. Interfaces

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Four main tasks were presented: (i) ceramic membrane functionalization (TiO 5 kDa and 300 kDa), (ii) extended material characterization (physicochemistry and tribology) of pristine and modified ceramic samples, (iii) evaluation of chemical and mechanical stability, and finally (iv) assessment of membrane efficiency in vacuum membrane distillation applied for volatile organic compounds (VOCs) removal from water. Highly efficient molecular grafting with four types of perfluoroalkylsilanes and one nonfluorinated agent was developed. Materials with controllable tribological and physicochemical properties were achieved. The most meaningful finding is associated with the applicability of fluorinated and nonfluorinated grafting agents. The results of contact angle, hysteresis of contact angle, sliding angle, and critical surface tension as well as Young's modulus, nanohardness, and adhesion force for grafting by these two modifiers are comparable. This provides insight into the potential applicability of environmental friendly hydrophobic and superhydrophobic surfaces. The achieved hydrophobic membranes were very effective in the removal of VOCs (butanol, methyl-tert-butyl ether, and ethyl acetate) from binary aqueous solutions in vacuum membrane distillation. The correlation between membrane effectiveness and separated solvent polarity was compared in terms of material properties and resistance to the wetting (kinetics of wetting and in-depth liquid penetration). Material properties were interpreted considering Zisman theory and using Kao diagram. The significant influence of surface chemistry on the membrane performance was noticed (5 kDa, influence of hydrophobic nanolayer and separation controlled by solution-diffusion model; 300 kDa, no impact of surface chemistry and separation controlled by liquid-vapor equilibrium).

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Mechanochemical Behavior of BaNd₂Ti₄O₁₂Powder in Ball Milling for High κ Microwave Applications

Cited by 2 publications

References 15 publications

Advanced Material-Ordered Nanotubular Ceramic Membranes Covalently Capped with Single-Wall Carbon Nanotubes

Advanced Material-Ordered Nanotubular Ceramic Membranes Covalently Capped with Single-Wall Carbon Nanotubes

Molecular Grafting of Fluorinated and Nonfluorinated Alkylsiloxanes on Various Ceramic Membrane Surfaces for the Removal of Volatile Organic Compounds Applying Vacuum Membrane Distillation

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