Development of Mesopore Structure of Mixed Metal Oxide through Albumin-Templated Coprecipitation and Reconstruction of Layered Double Hydroxide

Abstract

Mixed metal oxide (MMO) with relatively homogeneous mesopores was successfully obtained by calcination and reconstruction of albumin-templated layered double hydroxide (LDH). The aggregation degree of albumin-template was controlled by adjusting two different synthesis routes, coprecipitation and reconstruction. X-ray diffraction patterns and scanning electron microscopic images indicated that crystal growth of LDH was fairly limited during albumin-templated coprecipitation due to the aggregation. On the hand, crystal growth along the lateral direction was facilitated in albumin-templated reconstruction due to the homogeneous distribution of proteins moiety. Different state of albumin during LDH synthesis influenced the local disorder and porous structure of calcination product, MMO. The N2 adsorption-desorption isotherms demonstrated that calcination on reconstructed LDH produced MMO with large specific surface area and narrow distribution of mesopores compared with calcination of coprecipitated LDH.

Controlled molecular arrangement of easily aggregated deoxycholate with layered double hydroxide

“…The DL-R had a relatively larger particle size than the other hybrids and did not show specific morphology ( figure 4 e ). This is a typical morphology of LDH after reconstruction with organic moiety [ 43 – 45 ]. As the layer-by-layer stacking is slightly disordered in the reconstruction reaction, the particles of organically reconstructed LDH tended to show a random assembly of lamellar sheets.…”

Mixed Metal Oxide by Calcination of Layered Double Hydroxide: Parameters Affecting Specific Surface Area

“…Market and Industry Trend of MMO Metal oxide is one of the inorganic materials widely used as catalysts, electrodes, and adsorbents [46], and is used in all fields such as construction and industry, occupying a very important position in the infrastructure industry. MMOs are also used in various range of applications such as semiconductors, ceramics, and medicine as antifungal agents [47,48]. In particular, advanced ceramics are being used in various applications such as electronics, transportation, medical, environment, defense and security, and chemical industries, and the global market size is expected to reach $10,410 billion by 2021 [49].…”

“…We recently found that calcination of albumin-templated LDH produced MgAl-MMO with fairly high specific surface area. In this study, albumin (purchased from Sigma-Aldrich Inc., St. Louis, MO, USA) was added during two different LDH synthesis routes, coprecipitation and reconstruction, respectively ( Figure 9 a) [ 48 ].…”

“… ( a ) Schematic diagram to produce MMOs from either coprecipitated albumin-LDH or reconstructed albumin-LDH. ( b ) SEM image (obtained by FEI QUANTA 250 FEG, Hillsboro, OR, USA) and ( c ) pore size distribution of MMO obtained from reconstructed albumin-LDH (obtained by BELSORP-mini Ⅱ, Microtrac BEL, Inc., Japan) (adapted with the permission from Jung et al [ 48 ]. Copyright MDPI).…”

Highly Porous Layered Double Hydroxide and Mixed Metal Oxide by Sacrificial Bio-Template, Egg White Foam

“…The protein moieties are rapidly self-assembled around the air bubble to create a macromolecular network, leading to the coagulation; thus, EW acts as a selfaggregated template for porous metal oxide (first step of Figure 1a). We recently reported that porous MMO could be synthesized utilizing albumin as a bio-template through the repetitive calcination-reconstruction process [44]; however, the development of porosity had limitations when a single albumin is utilized as a template. In order to obtain a systematic molecular arrangement of a biogenic template, it is suggested to take advantage of natural protein components in EW.…”