Bio-Nanocomposite Hydrogel Based on Zinc Alginate/Graphene Oxide: Morphology, Structural Conformation, Thermal Behavior/Degradation, and Dielectric Properties

Bio-nanocomposite hydrogels based on sodium alginate (SA) as polymer matrix and graphene oxide (GO) nanosheets with zinc as crosslinking agent were synthesized with the aim of incorporating the intrinsic properties of their constituents (bioactivity and antimicrobial activity). Thus, stable and highly interconnected networks were obtained from GO nanosheets dispersed in SA matrices through interactions with low amounts of zinc. The GO nanosheets were successfully incorporated into the alginate matrix in the form of a complex nano-network involving different interactions: Bonds between alginate chains induced by Zn ions (egg box structure), interactions between GO nanosheets through Zn ions and hydrogen bonds between alginate chains, and GO nanosheets. The molecular interactions and morphology were confirmed by Fourier-transform infrared spectroscopy and transmission electron microscopy. The composite’s structural organization showed enhanced thermal stability. The glass transition temperature shifted to a higher temperature due to the reduced mobility induced by additional crosslinking bonds after incorporating the GO nanosheets and Zn into the polymer matrix. Finally, the dielectric behavior revealed that charge carrier mobility was hampered by the compact structure of the nanonetwork, which reduced conductivity. The combined properties of these nanocomposite hydrogels make them attractive biomaterials in the field of regenerative medicine and wound care since both surface bioactivity and antibacterial behavior are two critical factors involved in the success of a biomaterial.

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Modeling the Influence of Structure Morphology on the Physical and Mechanical Properties of Nanocomposites Based on a Polymer Matrix and Graphene Oxide

Mechanics of Solids ◽

10.3103/s0025654420030097 ◽

2020 ◽

Vol 55 (3) ◽

pp. 316-323

Author(s):

V. P. Matveenko ◽

M. A. Tashkinov

Keyword(s):

Mechanical Properties ◽

Graphene Oxide ◽

Polymer Matrix ◽

Physical And Mechanical Properties ◽

Structure Morphology

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Biomimetic jellyfish-like PVA/graphene oxide nanocomposite hydrogels with anisotropic and pH-responsive mechanical properties

Journal of Materials Science ◽

10.1007/s10853-016-9891-x ◽

2016 ◽

Vol 51 (12) ◽

pp. 5901-5911 ◽

Cited By ~ 25

Author(s):

Xin Peng ◽

Changcheng He ◽

Jiaqi Liu ◽

Huiliang Wang

Keyword(s):

Mechanical Properties ◽

Graphene Oxide ◽

Ph Responsive ◽

Nanocomposite Hydrogels

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Smart nanocomposite hydrogels based on azo crosslinked graphene oxide for oral colon-specific drug delivery

Nanotechnology ◽

10.1088/0957-4484/27/31/315105 ◽

2016 ◽

Vol 27 (31) ◽

pp. 315105 ◽

Cited By ~ 26

Author(s):

Lin Hou ◽

Yuyang Shi ◽

Guixiang Jiang ◽

Wei Liu ◽

Huili Han ◽

...

Keyword(s):

Drug Delivery ◽

Graphene Oxide ◽

Specific Drug ◽

Nanocomposite Hydrogels ◽

Colon Specific Drug Delivery

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Influence of Polymer Matrix on Polymer/Graphene Oxide Nanocomposite Intrinsic Properties

ACS Applied Polymer Materials ◽

10.1021/acsapm.1c00897 ◽

2021 ◽

Vol 3 (10) ◽

pp. 5145-5154

Author(s):

Bich Ngoc Tran ◽

Stuart C. Thickett ◽

Vipul Agarwal ◽

Per B. Zetterlund

Keyword(s):

Graphene Oxide ◽

Polymer Matrix ◽

Intrinsic Properties

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In situ iodoalkane-reduction of graphene oxide in a polymer matrix: an easy and effective approach for the fabrication of conductive composites

Journal of Materials Chemistry C ◽

10.1039/c5tc02719e ◽

2015 ◽

Vol 3 (43) ◽

pp. 11531-11539 ◽

Cited By ~ 6

Author(s):

Haiquan Guo ◽

Fangfang Liu ◽

Jianying Zhao ◽

Haibo Yao ◽

Rizhe Jin ◽

...

Keyword(s):

Graphene Oxide ◽

Polymer Matrix ◽

Conductive Composites ◽

Polyimide Composites

Graphene/polyimide composites with the conductivity of 2.22 S m−1 were fabricated via in situ reduction of graphene oxide by 1,2-diiodoethane.

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Sintesis Hidrogel Pektin – Gelatin dengan Penambahan Ekstrak Kulit Buah Naga Sebagai Kandidat Pembalut Luka Bakar

Jurnal Teknik Kimia dan Lingkungan ◽

10.33795/jtkl.v4i1.128 ◽

2020 ◽

Vol 4 (1) ◽

pp. 53

Author(s):

Fadhil Muhammad Tarmidzi ◽

Inggit Kresna Maharsih ◽

Tina Raihatul Jannah ◽

Cici Sari Wahyuni

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Citric Acid ◽

Wound Dressing ◽

Wound Care ◽

Crosslinking Agent ◽

Wound Dressings ◽

Esterification Reaction ◽

Natural Polymers ◽

Fruit Peel

Teknik pembalutan luka saat ini menerapkan metode perawatan luka modern dengan cara mempertahankan isolasi lingkungan luka dalam keadaan tertutup dan lembab. Ada beberapa jenis pembalut luka yang telah dikembangkan, salah satunya hidrogel. Hidrogel merupakan pembalut luka berbentuk lembaran yang memiliki kemampuan menyerap cairan luka dan memiliki stabilitas yang baik pada pH asam sehingga dapat digunakan untuk pengobatan luka bakar. Dalam penelitian ini, hidrogel dibuat menggunakan polimer alami seperti pektin dan gelatin. Kedua bahan tersebut dikombinasikan menggunakan metode ikatan silang dengan penambahan asam sitrat sebagai agen pengikat silang. Penambahan asam sitrat memberikan pengaruh terhadap karakteristik material hidrogel yang dihasilkan, sehingga diperlukan jumlah yang tepat agar didapatkan hidrogel dengan properti material yang baik. Hidrogel juga ditambahkan zat aktif berupa flavonoid pada ekstrak kulit buah naga agar dapat digunakan sebagai pembalut luka untuk menyembuhkan luka bakar. Dari hasil penelitian, hidrogel dengan konsentrasi asam sitrat 4% (Hidrogel CA 4%) menghasilkan nilai swelling, tensile strength, dan elongation tertinggi sebesar 890%, 0,05 Mpa, dan 200%. Hasil properti mekanik dari Hidrogel CA 4% ini dibuktikan dengan uji FTIR yang telah dilakukan, yaitu munculnya gugus karbonil C=O sebagai hasil reaksi esterifikasi yang terjadi antara polimer dengan asam sitrat di daerah serapan 1733,9 cm-1.Wound dressing technique currently applies modern wound care methods by maintaining the environmental isolation of the wound in a closed and moist state. There are several types of wound dressing that have been developed, one of them is hydrogel. Hydrogel is sheet-shaped wound dressings which have the ability to absorb exudate and have good stability acidic pH that can be used for the treatment of burns. In this study, hydrogel were made using natural polymers such as pectin and gelatin. The two polymers were combined using crosslinking method with the addition of citric acid as a crosslinking agent. The addition of citric acid has affect on the characteristics of the hydrogel material produced, therefore the right amount is needed to obtain a hydrogel with good mechanical properties. Hydrogel also added by an active substance in the form of flavonoids from dragon fruit peel extract that can be used as a wound dressing to cure burns. This study resulting hydrogel with a concentration of 4% citric acid (Hydrogel CA 4%) produced highest value of swelling, tensile strength, and elongation are 890%, 0.05 Mpa, and 200%, repectively. The mechanical properties of Hydrogel CA 4% was proved by FTIR test that had been carried out, namely the presence of C=O carbonyl group as a result of the esterification reaction that occurred between the polymers and citric acid in the absorption area of 1733.9 cm-1.

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Modeling the Effective Conductive Properties of Polymer Nanocomposites with a Random Arrangement of Graphene Oxide Particles

PNRPU Mechanics Bulletin ◽

10.15593/perm.mech/2021.2.15 ◽

2021 ◽

pp. 167-180

Author(s):

M. A Tashkinov ◽

A. D Dobrydneva ◽

V. P Matveenko ◽

V. V Silberschmidt

Keyword(s):

Finite Element ◽

Graphene Oxide ◽

Composite Materials ◽

Polymer Matrix ◽

Matrix Cracking ◽

Tunneling Effect ◽

Representative Volume ◽

Representative Volume Elements ◽

Oxide Particles ◽

Conductive Properties

Сomposite materials are widely used in various industrial sectors, for example, in the aviation, marine and automotive industries, civil engineering and others. Methods based on measuring the electrical conductivity of a composite material have been actively developed to detect internal damage in polymer composite materials, such as matrix cracking, delamination, and other types of defects, which make it possible to monitor a composite’s state during its entire service life. Polymers are often used as matrices in composite materials. However, almost always pure polymers are dielectrics. The addition of nanofillers, such as graphene and its derivatives, has been successfully used to create conductive composites based on insulating polymers. The final properties of nanomodified composites can be influenced by many factors, including the type and intrinsic properties of nanoscale objects, their dispersion in the polymer matrix, and interphase interactions. The work deals with modeling of effective electric conductive properties of the representative volume elements of nanoscale composites based on a polymer matrix with graphene oxide particles distributed in it. In particular, methods for evaluating effective, electrically conductive properties have been studied, finite element modelling of representative volumes of polymer matrices with graphene oxide particles have been performed, and the influence of the tunneling effect and the orientation of inclusions on the conductive properties of materials have been investigated. The possibility of using models of resistive strain gauges operating on the principle of the tunneling effect is studied. Based on the finite-element modeling and graph theory tools, we created approaches for estimating changes in the conductive properties of the representative volume elements of a nanomodified matrix subjected to mechanical loading.

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