Fabrication of elastic silica-bacterial cellulose composite aerogels with nanoscale interpenetrating network by ultrafast evaporative drying

2018 ◽  
Vol 155 ◽  
pp. 72-80 ◽  
Author(s):  
Huazheng Sai ◽  
Rui Fu ◽  
Junhui Xiang ◽  
Yunlong Guan ◽  
Fushi Zhang
Keyword(s):  
Bacterial Cellulose ◽  
Interpenetrating Network ◽  
Composite Aerogels ◽  
Cellulose Composite

scholarly journals Robust Silica-Cellulose Composite Aerogels with a Nanoscale Interpenetrating Network Structure Prepared Using a Streamlined Process

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 807
Author(s):  
Huazheng Sai ◽  
Jing Zhang ◽  
Zhiqiang Jin ◽  
Rui Fu ◽  
Meijuan Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Modulus ◽  
Silica Aerogels ◽  
Preparation Process ◽  
High Tensile Strength ◽  
Interpenetrating Network ◽  
The Matrix ◽  
Supercritical Co2 Drying ◽  
Composite Aerogels ◽  
Cellulose Composite

Silica aerogels can be strengthened by forming a nanoscale interpenetrating network (IPN) comprising a silica gel skeleton and a cellulose nanofiber network. Previous studies have demonstrated the effectiveness of this method for improving the mechanical properties and drying of aerogels. However, the preparation process is generally tedious and time-consuming. This study aims to streamline the preparation process of these composite aerogels. Silica alcosols were directly diffused into cellulose wet gels with loose, web-like microstructures, and an IPN structure was gradually formed by regulating the gelation rate. Supercritical CO2 drying followed to obtain composite aerogels. The mechanical properties were further enhanced by a simple secondary regulation process that increased the quantity of bacterial cellulose (BC) nanofibers per unit volume of the matrix. This led to the production of aerogels with excellent bendability and a high tensile strength. A maximum breaking stress and tensile modulus of 3.06 MPa and 46.07 MPa, respectively, were achieved. This method can be implemented to produce robust and bendable silica-based composite aerogels (CAs).

Biosynthesis of Carboxymethylated Bacterial Cellulose Composite for Wound Dressing

2011 ◽  
Vol 685 ◽  
pp. 322-326 ◽  
Author(s):  
Jun Wei Yu ◽  
Xiao Li Liu ◽  
Chang Sheng Liu ◽  
Dong Ping Sun
Keyword(s):  
Bacterial Cellulose ◽  
Wound Dressing ◽  
Culture Medium ◽  
Acetobacter Xylinum ◽  
Water Holding Capacity ◽  
Water Soluble ◽  
Transmission Rates ◽  
Measurement Results ◽  
Water Holding ◽  
Cellulose Composite

A novel bacterial cellulose (BC) composite (carboxymethylated-bacterial cellulose, CM-BC) was synthesized by Acetobacter xylinum by adding water-soluble carboxymethylated cellulose (CMC) in the culture medium. FTIR results showed that CM-BC is obtained by the incorporation of CMC in the network of BC. Water-holding capacity and water vapor transmission rates (WVTR) of CM-BC and BC are determined. The WVTR of CM-BC is comparable to that of BC, but the water-holding capacity of CM-BC is improved compared with BC. Tensile strengths measurement results showed that the fracture stress of CM-BC is higher than that of BC, indicating that CM-BC have more potential wound dressing applications than BC.

Biofabrication of a Hyaluronan/Bacterial Cellulose Composite Nanofibril by Secretion from Engineered Gluconacetobacter

2021 ◽  
Author(s):  
Ryo Takahama ◽  
Honami Kato ◽  
Kenji Tajima ◽  
Satomi Tagawa ◽  
Tetsuo Kondo
Keyword(s):  
Bacterial Cellulose ◽  
Cellulose Composite
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