Novel α-Si3N4 planar nanowire superhydrophobic membrane prepared through in-situ nitridation of silicon for membrane distillation

Li, Lin; Wang, Junwei; Zhong, Hao; Lu, Hao; Abadikhah, Hamidreza; Xu, Xin; Chen, Chusheng; Agathopoulos, Simeon

doi:10.1016/j.memsci.2017.08.049

Cited by 38 publications

(15 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the amount of catalysts including metal elements, such as Fe, Co, Ni, etc. are usually above 1 wt% and even up to 10 wt% . Comprehensively considering no addition of metal elements and no droplets were observed in the end region of nanowires (see Figure B), the synthesis of Si 3 N 4 nanowires follows the VS mechanism.…”

Section: Resultsmentioning

confidence: 92%

Novel micro‐spherical Si₃N₄ nanowire sponges from carbon‐doped silica sol foams via reverse templating method

et al. 2018

View full text Add to dashboard Cite

A novel kind of nanowire sponges, namely Si3N4 nanowire‐weaving microspheres, synthesized from a simple, convenient, high‐efficient approach are proposed here. As the reverse template, three‐dimensional foam skeleton structure with uniform pores and ultrathin pore walls is constructed via the effective particle‐stabilized foam method, where the silica sol and carbon black are chosen as the raw materials, providing the sufficient space for the growth of nanowires during the carbothermal reduction reaction process. The formation mechanism of this novel sponge is studied via multiple characterization methods. Si3N4 nanowires formed microspheres possess uniform and curving morphology due to the stable environment for growing via vapor–solid mechanism, leading to the relatively high specific surface area of 86.77 m2/g. Owing to in‐situ oxidation process, micro‐spherical SiO2 nanowire sponges with similar morphology are synthesized, which present diameter in range of 20‐40 nm and specific surface area of 50.47 m2/g. This work provides insights for the design of high‐performance nanowire sponges with promising applications in the filtration, thermal insulators, and catalyst supports fields.

show abstract

Section: Resultsmentioning

confidence: 92%

Novel micro‐spherical Si₃N₄ nanowire sponges from carbon‐doped silica sol foams via reverse templating method

et al. 2018

View full text Add to dashboard Cite

show abstract

“…These images suggest that the substrate is composed of Al, Ca, and O (in accordance with the results of the XRD analysis). Unlike the substrate, the amorphous nanostructured layer is composed of Si, C, O, and N, which provide the stable hydrophobic properties for the resultant modified membrane …”

Section: Resultsmentioning

confidence: 99%

“…FT‐IR spectroscopy (Thermo Nicolet 8700) and transmission electron microscopy (TEM, JEM‐2100F, Japan), equipped with EDS device for elemental analysis, were used to study the features of the hydrophobic surface layer developed on the porous Al 2 O 3 /CaAl 12 O 19 ceramic membrane after modification. Measurements of permeation of gas and pure water through the membrane, before and after surface modification, were conducted using home‐made equipment, which was described in our previous work …”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Production and characterization of durable self‐cleaning and engineering porous Al₂O₃/CaAl₁₂O₁₉ ceramic membranes

et al. 2019

Self Cite

View full text Add to dashboard Cite

The rapid development of engineering filtering process suggests that it is imperative to produce membrane substrates with a fine pore size, high gas permeation, and antifouling properties for efficient and long-term application. This study reports on a novel fabrication method of a porous Al 2 O 3 /CaAl 12 O 19 ceramic membrane substrate by a direct foaming method combined with cement solidification and tape-casting technology. The microstructure of the produced ceramic membrane consisted of pores with a size of 50-150 μm, which were interconnected with each other with a large number of small filtering functional pores of <10 μm. By increasing the amount of the foaming agent, the porosity of the porous Al 2 O 3 /CaAl 12 O 19 ceramic membranes was tailored from 64.8% to 80.5%, and the bending strength decreased from 32.1 ± 1.0 to 9.6 ± 0.9 MPa, respectively. The sintered hydrophilic ceramic substrate was successfully modified to a hydrophobic one (with water contact angles of 143°) by pyrolysis of dimethyldichlorosilane and dichloromethylsilane. The resultant membrane displayed high chemical stability and self-cleaning features. The membrane with a porosity of 64.8% had a N 2 permeation of 3.0 (±0.5) × 10 7 L m −2 h −1 at 0.5 bar and a water flux which could be totally suppressed at a liquid entry pressure of 0.45 bar.

show abstract

“…Vapor‐solid (VS) and vapor‐liquid‐solid (VLS) are two kinds of widely recognized nanofiber growth mechanisms, which can be judged by observing if there is catalyst at the tips of the nanofibers . In the case of VLS growth, Ni, Co, and Fe are generally used as catalysts, which stay at the tips of nanofibers during sintering and form spherical grain at the ends of nanofibers after sintering . Although a small quantity of Fe is detected (see Table ), the growth of nanofibers does not conform to VLS mechanism, because no catalyst is found on the tips of nanofibers, as shown in Figures B‐D.…”

Section: Resultsmentioning

confidence: 99%

In situ synthesis of three‐dimensional nanofiber‐knitted ceramic foams via reactive sintering silicon foams

Huo

Zhang

et al. 2018

J Am Ceram Soc

View full text Add to dashboard Cite

Three-dimensional ceramic nanofiber-assembled materials with large specific surface area and excellent thermal insulation properties are attracting increasing interests for their unique structure and promising applications. In this paper, we propose a facile methodology to fabricate three-dimensional silicon nitride nanofiber-knitted ceramic foams via in situ reactive synthesis from silicon foams. Silicon particle-stabilized foams are fabricated for the first time using long-chain surfactant cetyltrimethyl ammonium bromide as a hydrophobic modifier. First, the fabrication and stability of silicon foams are investigated. Based on the stable silicon foams, silicon nitride-based nanofiber-knitted ceramic foams are synthesized via in situ reactive sintering in nitrogen atmosphere. The novel ceramic foam materials consist of three-dimensional nanofiber-assembled strut wall and nanofiber-spheres in the pores. The diameter of obtained silicon nitride nanofibers ranges from 15 to 100 nm. The unique nanofiber-knitted foams may have potential applications in specific fields, including catalysis, adsorption, separation, and thermal insulation. K E Y W O R D Snanofiber-knitted foams, particle-stabilized foams, reactive sintering, silicon

show abstract

Novel α-Si3N4 planar nanowire superhydrophobic membrane prepared through in-situ nitridation of silicon for membrane distillation

Cited by 38 publications

References 48 publications

Novel micro‐spherical Si₃N₄ nanowire sponges from carbon‐doped silica sol foams via reverse templating method

Novel micro‐spherical Si₃N₄ nanowire sponges from carbon‐doped silica sol foams via reverse templating method

Production and characterization of durable self‐cleaning and engineering porous Al₂O₃/CaAl₁₂O₁₉ ceramic membranes

In situ synthesis of three‐dimensional nanofiber‐knitted ceramic foams via reactive sintering silicon foams

Contact Info

Product

Resources

About

Novel α-Si3N4 planar nanowire superhydrophobic membrane prepared through in-situ nitridation of silicon for membrane distillation

Cited by 38 publications

References 48 publications

Novel micro‐spherical Si3N4 nanowire sponges from carbon‐doped silica sol foams via reverse templating method

Novel micro‐spherical Si3N4 nanowire sponges from carbon‐doped silica sol foams via reverse templating method

Production and characterization of durable self‐cleaning and engineering porous Al2O3/CaAl12O19 ceramic membranes

In situ synthesis of three‐dimensional nanofiber‐knitted ceramic foams via reactive sintering silicon foams

Contact Info

Product

Resources

About

Novel micro‐spherical Si₃N₄ nanowire sponges from carbon‐doped silica sol foams via reverse templating method

Novel micro‐spherical Si₃N₄ nanowire sponges from carbon‐doped silica sol foams via reverse templating method

Production and characterization of durable self‐cleaning and engineering porous Al₂O₃/CaAl₁₂O₁₉ ceramic membranes