J 2017

Hybrid microporous and mesoporous organosilicate covalent polymers with high porosity

KEJÍK, Martin, Zdeněk MORAVEC, Craig E BARNES and Jiří PINKAS

Basic information

Original name

Hybrid microporous and mesoporous organosilicate covalent polymers with high porosity

Authors

KEJÍK, Martin (203 Czech Republic, belonging to the institution), Zdeněk MORAVEC (203 Czech Republic, belonging to the institution), Craig E BARNES (840 United States of America) and Jiří PINKAS (203 Czech Republic, guarantor, belonging to the institution)

Edition

MICROPOROUS AND MESOPOROUS MATERIALS, AMSTERDAM, ELSEVIER SCIENCE BV, 2017, 1387-1811

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10402 Inorganic and nuclear chemistry

Country of publisher

Netherlands

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 3.649

RIV identification code

RIV/00216224:14310/17:00098063

Organization unit

Faculty of Science

DOI

UT WoS

000395604600025

Keywords in English

Sol-gel; Non-hydrolytic condensation; Acetic acid elimination; Microporous; Mesoporous; Hybrid; Organosilicates

Tags

Tags

International impact, Reviewed
Změněno: 8/10/2018 16:42, prof. RNDr. Jiří Pinkas, Ph.D.

Abstract

V originále

A novel non-hydrolytic sol-gel synthesis of hybrid organosilicates is reported allowing control of micro/mesoporous character of the xerogels by variation of the silicon precursor. The polycondensation reaction of silicon(IV) acetate, Si(OAc)(4), with 1,3,5-trihydroxybenzene (THB) in dry dioxane at 100 degrees C produces acetic acid and highly porous amorphous aromatic organosilicate xerogels. Their apparent BET surface areas are as high as 990 m(2) g(-1) and the total pore volume is 0.843 cm(3) g-1. These materials are mostly microporous with a low abundance of mesopores and an average pore size of 3.5 nm. The reaction of HSi(OAc)(3) with THB produced a novel mesoporous material with properties superior to xerogels obtained from Si(OAc)(4). The BET surface area of 933 m(2) g(-1) is retained upon heating and average pore size reached 6.0 nm. The total pore volume of 1.36 cm(3) g(-1) is the highest value achieved in porous aromatic organosilicates so far and is comparable to values typical for 3D covalent organic networks (COFs). The materials are stable up to 400-500 degrees C but they are sensitive to hydrolysis in moist air. The reactions of other silicon precursors (MeSi(OAc)(3) and (BuSi)-Bu-t(OAc)(3)) and larger polyphenol connectors, 1,3,5-tris(4 '-hydroxyphenyl)benzene (THPB), 2,4,6-tris(4 '-hydroxyphenyl)-1,3,5-triazine (THPTA), and 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP), produced materials with less satisfactory properties. (C) 2016 Elsevier Inc. All rights reserved.

Links

LM2015043, research and development project
Name: Česká infrastruktura pro integrativní strukturní biologii (Acronym: CIISB)
Investor: Ministry of Education, Youth and Sports of the CR
LQ1601, research and development project
Name: CEITEC 2020 (Acronym: CEITEC2020)
Investor: Ministry of Education, Youth and Sports of the CR