Diatom-inspired silicification process for development of green flexible silica composite aerogels

Scientific Reports, Год журнала: 2024, Номер 14(1)

Опубликована: Март 23, 2024

In this study, we have developed novel biomimetic silica composite aerogels and cryogels for the first time, drawing inspiration from natural diatom's silicification process. Our approach involved modification of tyrosinase-mediated oxidized silk fibroin (SFO) surfaces with polyethyleneimine (PEI). This introduced ample amine groups onto SF polymer, which catalyzed SFO-PEI gel surface silicic acid. process emulates catalytic function long-chain polyamines silaffin proteins found in diatoms, resulting a network structure on primary gel's surface. The matrix played dual role process: (1) It provided numerous functional that directly acid porous structure's exterior surface, without encapsulating created gel. (2) served as flexible mechanical support facilitating creation network. As result, final ceramic exhibits mechanically nature (e.g., cyclic compressibility up to 80% strain), distinguishing it conventional aerogels. By mimicking process, were able simplify development silica-polymer eliminates need surfactants, multi-step procedures involving solvent exchange, washing. Instead, reaction occurs under mild conditions, streamlining fabrication

Язык: Английский

---

Heat treatment customizes pore structure of silica aerogel: The induced role of faults

Construction and Building Materials, Год журнала: 2024, Номер 452, С. 138812 - 138812

Опубликована: Ноя. 1, 2024

Язык: Английский

---

Effect of Silicone Modifier on the Physical Properties of Flexible Silica Aerogels

Polymers, Год журнала: 2023, Номер 15(9), С. 2043 - 2043

Опубликована: Апрель 25, 2023

Research on the development of flexible silica aerogels (FSAs) has been ongoing due to their excellent thermal insulation, low density, and high elasticity. However, physical properties FSAs, such as conductivity, mechanical strength, surface wettability, are highly dependent preparation conditions. To achieve desired FSAs for various applications, it is necessary develop a method fine-tune properties. In this paper, two modifiers methyltrimethoxysilane (MTMS)/trimethylethoxysilane (TMES) were employed bulk density series (FSAs), reflecting with fine-tunable First, precursor was synthesized by click reaction between vinyltrimethoxysilane (VTMS) 2,2' (ethylenedioxy) diethanethiol (EDDET). The VTMS, EDDET, as-prepared characterized FT-IR NMR spectroscopy. Subsequently, converted into (denoted FSA, FSA-M, FSA-T) through conventional sol-gel reactions with/without MTMS/TMES. Chemical structures confirmed 13C 29Si solid-state porous structure identified BET SEM, respectively. Physical properties, wettability determined Hot Disk, durometer/DMA in compression mode, contact angle measurements, This study found containing none, 1 wt%, 5 10 wt% MTMS increase from 0.419 g/cm3 (FSA), 0.423 (FSA-M1), 0.448 (FSA-M5), 0.456 (FSA-M10). It should be noted that hardness, hydrophobicity FSA-Ms increasing loading all show rising trend, while FSA-Ts exhibited lower density. FSA-T10 strength compared FSA. higher

Язык: Английский

---

A Silica Aerogel-Based Thermal Insulation Composite Film for Metal Surfaces in Gas Industries

Опубликована: Янв. 1, 2023

Silica aerogels are ultralight superinsulators that can increase the efficiency of insulation materials up to three times. In this study, hydrophobic silica were synthesized using an inexpensive and available water-glass precusor at ambient pressure, without need for specific equipment sol-gel method. Formation was confirmed FT-IR, SEM, TEM, BET BJH methods. Thermal stability hydrophilicity investigated by TGA contact angle measurement, respectively. Then, composites including equal amount anti-corrosion alkyd resin-zinc Chromate containing weight percentages 0, 1, 5, 10, 20, 30, 40 50 prepared from aerogels. The thermal conductivity measured in liquid state. results indicated a significant decrease increasing percentage aerogel. composite adherence then evaluated. Composites with highest aerogel proper according standard set National Gas Company Isfahan province, along paint thinner dilution colorless cobalt drier, coated on aluminum plates thickness 1.2 mm film dry study showed 30% B5 had least it be used as various gas industries.

Язык: Английский

---

A silica aerogel-based thermal insulation composite film for metal surfaces in gas industries

Results in Surfaces and Interfaces, Год журнала: 2023, Номер 13, С. 100160 - 100160

Опубликована: Окт. 1, 2023

Silica aerogels are ultralight superinsulators that can increase the efficiency of insulation materials up to three times. In this study, hydrophobic silica were synthesized using an inexpensive and available water-glass precursor at ambient pressure, without need for specific equipment sol-gel method. The formation was confirmed FT-IR, SEM, TEM, BET BJH methods. Thermal stability hydrophilicity investigated by TGA contact angle measurement, respectively. Then, composites including equal amount anti-corrosion alkyd resin-zinc Chromate containing weight percentages 0, 1, 5, 10, 20, 30, 40 50 prepared from aerogels. thermal conductivity measured in a liquid state. results indicated significant decrease increasing percentage aerogel. composite adherence then evaluated. Composites with highest aerogel proper according standard set National Gas Company Isfahan province, along paint thinner dilution colorless cobalt drier, coated on aluminum plates thickness 1.2 mm film dry study showed 30% B5 had least it be used as various gas industries.

Язык: Английский

---

Development of latex / silica aerogel composites for thermal insulation applications.

Developments in the Built Environment, Год журнала: 2024, Номер unknown, С. 100576 - 100576

Опубликована: Ноя. 1, 2024

Язык: Английский

---