Preparation of a compressible and hierarchically porous polyimide sponge via the sol–gel process of an aliphatic tetracarboxylic dianhydride and an aromatic triamine

2016 ◽  
Vol 52 (68) ◽  
pp. 10419-10422 ◽  
Author(s):  
Jeongmin Lee ◽  
Ji Young Chang
Keyword(s):  
Sol Gel ◽  
Hierarchically Porous ◽  
Sorbent Material ◽  
Sol Gel Process ◽  
Tetracarboxylic Dianhydride

A monolithic microporous polyimide sponge with compressibility and an amphiphilic character was synthesized for use as a soft sorbent material.

Synthesis of hierarchically porous MnO/C composites via a sol–gel process followed by two-step combustion for lithium-ion batteries

2020 ◽  
Vol 44 (28) ◽  
pp. 12307-12316
Author(s):  
Wei Liu ◽  
Daoyan Feng ◽  
Hui Yang ◽  
Xingzhong Guo
Keyword(s):  
Phase Separation ◽  
Lithium Ion Batteries ◽  
Sol Gel ◽  
Lithium Ion ◽  
Hierarchically Porous ◽  
Sol Gel Process

Hierarchically porous MnO/C composites with interconnected macropores and co-continuous skeletons were fabricated via a sol–gel process combined with phase separation, followed by a two-step combustion.

scholarly journals Preparation of a hierarchically porous AlPO4monolith via an epoxide-mediated sol–gel process accompanied by phase separation

2013 ◽  
Vol 14 (4) ◽  
pp. 045007 ◽  
Author(s):  
Wenyan Li ◽  
Yang Zhu ◽  
Xingzhong Guo ◽  
Kazuki Nakanishi ◽  
Kazuyoshi Kanamori ◽  
...  
Keyword(s):  
Phase Separation ◽  
Sol Gel ◽  
Hierarchically Porous ◽  
Sol Gel Process

Synthesis of Monolithic Hierarchically Porous Iron-Based Xerogels from Iron(III) Salts via an Epoxide-Mediated Sol–Gel Process

2012 ◽  
Vol 24 (11) ◽  
pp. 2071-2077 ◽  
Author(s):  
Yasuki Kido ◽  
Kazuki Nakanishi ◽  
Akira Miyasaka ◽  
Kazuyoshi Kanamori
Keyword(s):  
Sol Gel ◽  
Porous Iron ◽  
Hierarchically Porous ◽  
Sol Gel Process ◽  
Iron Based

Preparation and Characterization of Polyimide-Silica Nanocomposites by Sol-Gel Process

2006 ◽  
Vol 111 ◽  
pp. 111-114 ◽  
Author(s):  
Yao Yi Cheng ◽  
Kun Chang Chuang
Keyword(s):  
Sol Gel ◽  
Amic Acid ◽  
Silica Content ◽  
Nano Particles ◽  
Hybrid Thin Film ◽  
Silica Nanocomposites ◽  
Sol Gel Process ◽  
Tetracarboxylic Dianhydride

Polyimide (PI)-based nanocomposites were prepared by the in-situ generation of organic silica nano-particles through a sol-gel process, combined with spin coating and multi-step curing process. In this study, silica nano-particles were introduced into the PI matrix to promote its thermal properties. Nanometer-scale composites were successfully obtained from poly(amic acid) (PAA) mixture loaded with silica. 3,3’,4,4’- Biphenyl tetracarboxylic dianhydride (BPDA) and p-phenylenediamine (p-PDA) were employed to synthesize the PAA precursor. The hybrid thin film was prepared from aminoalkoxysilane-capped PAA and tetraethoxysilane (TEOS). In this work, we investigated the effect of coupling agent, 3-aminopropyltriethoxysilane (APrTEOS). The TGA results indicate that the thermal stability of the nanocomposites can be enhanced as silica content increases. Without the incorporation of APrTEOS, less improvement can be achieved.

scholarly journals Synthesis of Hierarchically Porous Metal Oxide Monoliths via Sol–Gel Process Accompanied by Phase Separation From Divalent Metal Salts: A Short Review

2021 ◽  
Vol 3 ◽  
Author(s):  
Xuanming Lu ◽  
Kazuki Nakanishi
Keyword(s):  
Phase Separation ◽  
Metal Oxide ◽  
Sol Gel ◽  
Porous Metal ◽  
Short Review ◽  
Divalent Metal ◽  
Metal Salts ◽  
Hierarchically Porous ◽  
Metal Phosphates ◽  
Sol Gel Process

The sol–gel process accompanied by phase separation is one of the methods to prepare hierarchically porous monoliths, hierarchically porous monolith, which is applicable not only to oxides but also to various materials compositions such as metal phosphates, organic-polymers/carbons, metal-organic frameworks. It is not until recently, however, that progress has been made in the preparation of low-valence metal oxide HPMs, such as those of magnesium, manganese, cobalt, nickel, etc. Due to the difficulty of divalent metal precursors to form homogeneous gels, different approaches from those established for trivalent and tetravalent counterparts have been attempted. This short review introduces the methods and trials in the preparation of metal oxide HPMs from divalent metal salts.

scholarly journals Hierarchically porous monoliths based on low-valence transition metal (Cu, Co, Mn) oxides: gelation and phase separation

2020 ◽  
Vol 7 (11) ◽  
pp. 1656-1666 ◽  
Author(s):  
Xuanming Lu ◽  
Kazuyoshi Kanamori ◽  
Kazuki Nakanishi
Keyword(s):  
Phase Separation ◽  
Sol Gel ◽  
Average Molecular Weight ◽  
Reaction Parameters ◽  
Valence Transition ◽  
Hierarchically Porous ◽  
Sol Gel Process ◽  
Crystalline Metal ◽  
Hydrolysis And Polycondensation ◽  
Mn Oxides

Abstract Hierarchically porous monoliths based on copper (Cu), cobalt (Co) and manganese (Mn) oxides with three-dimensionally (3D) interconnected macropores and open nanopores were prepared using metal bromides as precursors via a sol–gel process accompanied by phase separation. The difficulty of gelation for low-valence metal cation was overcome by introducing a highly electronegative Br atom near to the metal atom to control the rates of hydrolysis and polycondensation. The 3D interconnected macropores were obtained using appropriate polymers to induce phase separation. The domain sizes of macropores and skeletons can be controlled by reaction parameters such as concentration and/or average molecular weight of polymers, and the amount of hydrochloric acid. The crystalline metal oxide monoliths with their 3D interconnected macroporous structure preserved were obtained after heat treatment in air.

Hierarchically porous monoliths prepared via sol–gel process accompanied by spinodal decomposition

2020 ◽  
Vol 95 (3) ◽  
pp. 530-550 ◽  
Author(s):  
Xuanming Lu ◽  
George Hasegawa ◽  
Kazuyoshi Kanamori ◽  
Kazuki Nakanishi
Keyword(s):  
Spinodal Decomposition ◽  
Sol Gel ◽  
Hierarchically Porous ◽  
Sol Gel Process
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