Adsorption and release on three-dimensional graphene oxide network structures

In this study, three-dimensional network architectures are constructed using nano-sized graphene oxide (nGO) as the building block. The cross-linking reaction of nGO is conducted in sub-micrometre water droplets in an emulsion system to control the size of the networks by restricting the reaction space. Two types of three-dimensional GO networks with different cross-linking lengths were constructed, and their methyl orange adsorption and release behaviours were investigated under external stimuli, such as thermal treatment, ultrasonic wave treatment and near-infrared light irradiation.

Download Full-text

A three-dimensional graphene oxide supramolecular hydrogel for infrared light-responsive cascade release of two anticancer drugs

Chemical Communications ◽

10.1039/c6cc08123a ◽

2016 ◽

Vol 52 (100) ◽

pp. 14384-14387 ◽

Cited By ~ 21

Author(s):

Wei Ha ◽

Xiao-Bo Zhao ◽

Kan Jiang ◽

Yang Kang ◽

Juan Chen ◽

...

Keyword(s):

Graphene Oxide ◽

Anticancer Drugs ◽

Near Infrared ◽

Three Dimensional ◽

Infrared Light ◽

Supramolecular Hydrogel ◽

Near Infrared Light

A graphene oxide hybrid supramolecular hydrogel with a well-defined interior microstructure was developed for near infrared light-triggered cascade release of two anticancer drugs.

Download Full-text

Three-dimensional network graphene oxide/sodium alginate aerogel beads with slit-shaped structure: synthesis, performance and selective adsorption mechanism for Cu(II)

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.106819 ◽

2021 ◽

pp. 106819

Author(s):

Cheng Ji ◽

Shuyi Yang ◽

E Tao ◽

Ying Cheng ◽

Xin Hao ◽

...

Keyword(s):

Graphene Oxide ◽

Sodium Alginate ◽

Adsorption Mechanism ◽

Selective Adsorption ◽

Three Dimensional ◽

Dimensional Network ◽

Structure Synthesis

Download Full-text

Optically transparent, high-toughness elastomer using a polyrotaxane cross-linker as a molecular pulley

Science Advances ◽

10.1126/sciadv.aat7629 ◽

2018 ◽

Vol 4 (10) ◽

pp. eaat7629 ◽

Cited By ~ 21

Author(s):

Hiroaki Gotoh ◽

Chang Liu ◽

Abu Bin Imran ◽

Mitsuo Hara ◽

Takahiro Seki ◽

...

Keyword(s):

External Force ◽

Matrix Material ◽

Three Dimensional ◽

Cross Linking ◽

High Toughness ◽

Dimensional Network ◽

Cyclic Molecules ◽

Optically Transparent ◽

The Matrix ◽

Special Challenge

An elastomer is a three-dimensional network with a cross-linked polymer chain that undergoes large deformation with a small external force and returns to its original state when the external force is removed. Because of this hyperelasticity, elastomers are regarded as one of the best candidates for the matrix material of soft robots. However, the comprehensive performance required of matrix materials is a special challenge because improvement of some matrix properties often causes the deterioration of others. For example, an improvement in toughness can be realized by adding a large amount of filler to an elastomer, but to the impairment of optical transparency. Therefore, to produce an elastomer exhibiting optimum properties suitable for the desired purpose, very elaborate, complicated materials are often devised. Here, we have succeeded in creating an optically transparent, easily fabricated elastomer with good extensibility and high toughness by using a polyrotaxane (PR) composed of cyclic molecules and a linear polymer as a cross-linking agent. In general, elastomers having conventional cross-linked structures are susceptible to breakage as a result of loss of extensibility at high cross-linking density. We found that the toughness of the transparent elastomer prepared using the PR cross-linking agent is enhanced along with its Young’s modulus as cross-linking density is increased.

Download Full-text

Bioactivity of PEGylated Graphene Oxide Nanoparticles Combined with Near-Infrared Laser Irradiation Studied in Colorectal Carcinoma Cells

Nanomaterials ◽

10.3390/nano11113061 ◽

2021 ◽

Vol 11 (11) ◽

pp. 3061

Author(s):

Natalia Krasteva ◽

Dessislava Staneva ◽

Bela Vasileva ◽

George Miloshev ◽

Milena Georgieva

Keyword(s):

Colorectal Cancer ◽

Graphene Oxide ◽

Colorectal Carcinoma ◽

Cancer Cells ◽

Laser Irradiation ◽

Molecular Mechanisms ◽

Near Infrared ◽

Carcinoma Cells ◽

Infrared Light ◽

Mitochondrial Activity

Central focus in modern anticancer nanosystems is given to certain types of nanomaterials such as graphene oxide (GO). Its functionalization with polyethylene glycol (PEG) demonstrates high delivery efficiency and controllable release of proteins, bioimaging agents, chemotherapeutics and anticancer drugs. GO–PEG has a good biological safety profile, exhibits high NIR absorbance and capacity in photothermal treatment. To investigate the bioactivity of PEGylated GO NPs in combination with NIR irradiation on colorectal cancer cells we conducted experiments that aim to reveal the molecular mechanisms of action of this nanocarrier, combined with near-infrared light (NIR) on the high invasive Colon26 and the low invasive HT29 colon cancer cell lines. During reaching cancer cells the phototoxicity of GO–PEG is modulated by NIR laser irradiation. We observed that PEGylation of GO nanoparticles has well-pronounced biocompatibility toward colorectal carcinoma cells, besides their different malignant potential and treatment times. This biocompatibility is potentiated when GO–PEG treatment is combined with NIR irradiation, especially for cells cultured and treated for 24 h. The tested bioactivity of GO–PEG in combination with NIR irradiation induced little to no damages in DNA and did not influence the mitochondrial activity. Our findings demonstrate the potential of GO–PEG-based photoactivity as a nanosystem for colorectal cancer treatment.

Download Full-text

Study on the thermal insulation performance of the core–shell skeleton graphene oxide/carbon composite aerogel

Journal of Polymer Engineering ◽

10.1515/polyeng-2021-0109 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Hongli Liu ◽

Peng Wang ◽

Wenjin Yuan ◽

Hongyan Li

Keyword(s):

Graphene Oxide ◽

Solid Phase ◽

Three Dimensional ◽

Carbon Aerogel ◽

Carbon Composite ◽

Core Shell ◽

Composite Aerogel ◽

Dimensional Network ◽

Heat Shielding ◽

Insulation Performance

Abstract Phenolic resin (PR) was grafted onto the surface of graphene oxide (GO) through π–π conjugation and chemical bonding. After carbonization, organic compounds turned into carbon layers with a thickness of about 10 nm and coated on the surface of GO formed a core–shell structure. Besides, the adiabatic interface formed during organic carbonization can effectively connect the aerogels into a three-dimensional network. The optimum mass ratio of GO was determined to be 10 wt% in the preparation of the precursor aerogel. The adiabatic interfaces (carbon) between GO lamellae could effectively reduce the solid phase heat transfer in aerogels (thermal conductivity is 0.0457 W m−1 K−1). At the same time, the existence of GO also ensured better mechanical properties of GO/carbon composite aerogel (compressive strength is 2.43 MPa) compared with the pure carbon aerogel (1.52 MPa), demonstrating the excellent heat-shielding performance and mechanical property of GO/carbon aerogel.

Download Full-text