Flexible aerogels based on an interpenetrating network of bacterial cellulose and silica by a non-supercritical drying process

2013 ◽  
Vol 1 (27) ◽  
pp. 7963 ◽  
Author(s):  
Huazheng Sai ◽  
Li Xing ◽  
Junhui Xiang ◽  
Lijie Cui ◽  
Jianbin Jiao ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Supercritical Drying ◽  
Drying Process ◽  
Interpenetrating Network

scholarly journals Synthesis and Characterization of a New Collagen-Alginate Aerogel for Tissue Engineering

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Abraham Muñoz-Ruíz ◽  
Diana M. Escobar-García ◽  
Mildred Quintana ◽  
Amaury Pozos-Guillén ◽  
Héctor Flores
Keyword(s):  
Tissue Engineering ◽  
Cell Attachment ◽  
Supercritical Drying ◽  
Drying Process ◽  
Sem Images ◽  
Promote Cell Migration ◽  
Carbon Based Nanomaterials ◽  
Highly Porous ◽  
Alginate Scaffold

Scaffolds have been used as extracellular matrix analogs to promote cell migration, cell attachment, and cell proliferation. The use of aerogels and carbon-based nanomaterials has recently been proposed for tissue engineering due to their properties. The aim of this study is to develop a highly porous collagen-alginate(-graphene oxide) aerogel-based scaffold. The GO synthesis was performed by Hummers method; a collagen-alginate and collagen-alginate-GO hydrogel were synthetized; then, they were treated by a supercritical drying process. The aerogels obtained were evaluated by SEM and FTIR. Osteoblasts were seeded over the scaffolds and evaluated by SEM. According to the characterization, the aerogels showed a highly porous interconnected network covered by a nonporous external wall. According to the FTIR, the chemical functional groups of collagen and GO were maintained after the supercritical process. The SEM images after cell culture showed that a collagen-alginate scaffold promotes cell attachment and proliferation. The alginate-collagen aerogel-based scaffold could be a platform for tissue engineering since it shows adequate properties. Further studies are needed to determine the cell interactions with GO.

Ultralight nanocomposite aerogels with interpenetrating network structure of bacterial cellulose for oil absorption

2019 ◽  
Vol 136 (39) ◽  
pp. 48000
Author(s):  
Xiaolin Nie ◽  
Pengfei Lv ◽  
Sarah L. Stanley ◽  
Di Wang ◽  
Shuanglin Wu ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Network Structure ◽  
Oil Absorption ◽  
Interpenetrating Network

scholarly journals Supercritical CO2 drying of food matrices

2018 ◽  
Author(s):  
S. Spilimbergo ◽  
A. Zambon ◽  
T. M. Vizzotto ◽  
G. Morbiato ◽  
M. Toffoletto ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Supercritical Drying ◽  
Microbial Inactivation ◽  
Process Conditions ◽  
Drying Methods ◽  
Drying Process ◽  
Promising Alternative ◽  
Supercritical Co2 Drying ◽  
Conventional Drying ◽  
Drying Efficiency

This work explore the use of supercritical CO2 drying as alternative technique for the obtainment of pasteurized and high quality dried product. Several tests were conducted on animal, vegetable and fruit matrixes in order to investigate the effectiveness of SC-CO2 drying process at different process conditions. Design of experiment was performed to find the optimal process conditions for vegetable and fruit matrices, using the final water activity of the products as key indicator for the drying efficiency. The inactivation of naturally present microorganisms and inoculated pathogens demonstrated the capability of SC-CO2 drying process to assure a safe product. Moreover, retention of nutrients was compared with conventional drying methods. Results suggest that supercritical drying is a promising alternative technology for food drying. Keywords: supercritical drying; carbon dioxide; food drying; microbial inactivation

scholarly journals High Nanopore Volume Tetrethoxysilane Based Aerogels Prepared with Addition of N, N-Dimethylformamide at Different Stage of the Sol-Gel Process

2021 ◽  
Author(s):  
Chaoshuai LEI ◽  
Enshuang ZHANG ◽  
Hongyan HUANG ◽  
Xuyang JI ◽  
Lijuan HE ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Sol Gel ◽  
Supercritical Drying ◽  
Silica Aerogels ◽  
Drying Process ◽  
Chemical Additive ◽  
Structure Control ◽  
Colloid Particles ◽  
Sol Gel Process ◽  
Uniform Pore Size

Using tetraethoxysilane (TEOS) as a precursor, silica aerogels were synthesized via the sol-gel polymerization followed by supercritical drying process. During the polymerization period, N, N-dimethylformamide (DMF), acting as a chemical additive for the structure control, was introduced in the hydrolysis step and condensation step, respectively. As a result, the nanopore volumes for the pores smaller than 100 nm were up to 6.0 cm3/g and 5.7 cm3/g for the samples that produced with DMF addition in the hydrolysis step and condensation step, while the value for the sample without DMF was only 4.6 cm3/g. Besides, the sample with DMF addition in the condensation step possessed more uniform pore size distribution while compared with that with DMF addition in the hydrolysis step. DMF can provide a shielding layer around the colloid particles through hydrogen bonds, inhibiting the aggregation of colloid particles and the enlarging of pore sizes.

scholarly journals An environmentally benign approach to achieving vectorial alignment and high microporosity in bacterial cellulose/chitosan scaffolds

RSC Advances ◽  
2017 ◽  
Vol 7 (23) ◽  
pp. 13678-13688 ◽  
Author(s):  
Guohui Li ◽  
Avinav G. Nandgaonkar ◽  
Youssef Habibi ◽  
Wendy E. Krause ◽  
Qufu Wei ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Liquid Nitrogen ◽  
Freeze Drying ◽  
Environmentally Benign ◽  
Porous Scaffolds ◽  
Drying Process ◽  
Chitosan Scaffolds ◽  
Komagataeibacter Xylinus ◽  
Ice Templating

Bacterial cellulose (BC) nanofibers secreted by Komagataeibacter xylinus 10245 were applied alone or with chitosan to prepare highly aligned and porous scaffolds through a liquid nitrogen-initiated ice “templating” and freeze-drying process.

Effect of Alkalization on the Bacterial Cellulose Film Structure Produced Using the Pineapple Waste

2020 ◽  
Vol 851 ◽  
pp. 92-96
Author(s):  
Muhamad Muhajir ◽  
Heru Suryanto ◽  
Aisyah Larasati
Keyword(s):  
Physical Properties ◽  
Bacterial Cellulose ◽  
Cellulose Fibers ◽  
Film Structure ◽  
Cellulose Film ◽  
Drying Process ◽  
Natural Polymers ◽  
High Concentration ◽  
Renewable Source ◽  
Pineapple Waste

Bacterial cellulose is natural polymers materials produced by Acetobacter xylinum with attractive physical properties because they are ordinary and uniform in structure. An alternative of cellulose from renewable source with more effective results to produce bacterial cellulose fibers. For this reason, the purpose of this paper is to show the effect of alkalization process on the bacterial cellulose film structure. The methods were the synthesis of bacterial cellulose using the extracts of pineapple waste. The pellicle product was treated using in the concentration of 0%, 1%, 5% and 10% then bacterial fiber films obtained from drying process of treated pellicle. Furthermore, the XRD and FTIR of bacterial cellulose were observed. The results of the structure of bacterial cellulose film was changed after a process in a high concentration of NaOH.

Synthesis, Preparation and Characterization of Amine-Induced Bacterial Cellulose-Poly(Vinyl Alcohol) Semi-Interpenetrating Network Hydrogel

2020 ◽  
Vol 841 ◽  
pp. 238-242
Author(s):  
Joachim Emeka Arikibe ◽  
Roselyn Lata ◽  
David Rohindra
Keyword(s):  
Electron Microscopy ◽  
Bacterial Cellulose ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Gluconacetobacter Xylinus ◽  
Interpenetrating Network ◽  
Equilibrium Water Content ◽  
Network Chain ◽  
Scanning Electron

Bacterial cellulose (BC) was synthesized using Gluconacetobacter xylinus (BCRC 14182). Synthesized BC was powdered and dissolved in Bis(ethylenediamine) copper (II) hydroxide (Cuen) solution to introduce the amine (NH2) group onto the BC network to yield modified BC (mBC) which was then blended with poly (vinyl alcohol) (PVA) and subsequently crosslinked with genipin (Gp). Pristine, modified and crosslinked hydrogels were studied using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and swelling behavior in water. FTIR revealed a distortion on the BC network chain via a reduction in the absorption of OH peak of mBC and the emergence of peaks at 1587 and 1560 cm-1 attributed to N-H stretching of the induced NH2 group. SEM confirmed the 3-D fibril and porous structure of BC which became distorted after modification and crosslinking. The hydrogels showed equilibrium water content of 86.5%, 67.5%, 66.7% and 33.0 % for BC, PVA, mBC-PVA and mBC-PVA-Gp, respectively. The decreased swelling in mBC-PVA-Gp indicated that genipin was able to crosslink the modified BC.

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