Piezo catalytic materials offer a wide range of applications in wireless therapies. A study published in the journal ACS Applied Materials & Interfaces showed that anisotropic geometry and the incorporation of gold nanoparticles (Au NP) improve the piezocalysis capacity of calcium phosphate (Ca3 (PO4) 2) nanomaterials. ten times, and the behavior matched that of the well-known bulk / NP form of barium titanate (BaTiO3).
Study: Piezocatalysis enhanced by calcium phosphate nanowires by conjugation of gold nanoparticles. Image credit: Yurchanka Siarhei / Shutterstock.com
The potential of piezoelectric nanomaterials
Piezoelectric nanoparticles are developing as a new type of intelligent material with potential in energy collection, ecological restoration and improved biomedical solutions. The use of piezoelectric nanoparticles in biomedical studies has been of particular interest.
These nanoparticles can produce chemical energy from mechanical energy and trigger electrolytic surface reactions by using small frequency oscillations such as ultrasound. This property has enormous potential for biomedical use due to its non-invasive nature and its ability to penetrate deep tissues.
The main obstacle in the way of piezoelectric nanomaterials
Because ultrasound has a broader medical applicability, ranging from the diagnosis of ultrasound-based diseases to treatment, ultrasound-induced piezocatalytic therapy can be used for a variety of biological applications. Traditional high-performance piezoelectric substances are made of cytostatic lead (such as lead zirconium titanate) and are not suitable for biomedical activities.
Therefore, the search for nanoscale alternative materials such as ZnO, BN, MoS2 and BaTiO3 nanotubes has persisted. However, compared to industrial-grade lead-based substances, the piezoocatalysis of these identified nanoscale materials is significantly reduced. As a result, there is an ongoing focus on developing better piezocatalytic NPs.
Piezoelectric materials become aqueous nanoparticles with proven uses for remote stimulation of nerve cells, treatment of cells / cancers, management of the fate of nerve stem cells, cell distinction, use of brightness of teeth and rupture of amyloid fibrils (Aβ).
How can piezo-catalytic performance be improved?
The efficiency of a piezocatalytic NP decreases with nanoparticle diameter, but can be increased by creating compounds with highly conductive 2D materials (such as BN nanosheets) or conjugating with metallic NPs; or forming polymeric compounds.
Attaching metal NPs to piezoelectric materials especially improves the performance of piezo catalysis in two different ways. Whenever the piezoelectric potential is formed in ultrasonic exposure, the NP-connected metal on the face of the piezoelectric substance produces an effective division of holes and electrons.
The incorporation of metallic NPs into the piezoelectric substance causes a greater mismatch of the charges on the surface along the polar axis, thus improving the piezoelectric characteristic.
Calcium phosphate for biomedical applications
Calcium phosphate (Ca3 (PO4) 2) is a popular biomaterial, the nanoparticles of which are used to regenerate bones and cartilage and for other medicinal purposes. Nanoscale structures of polarized hydroxyapatite, both in vivo and in vitro, have been shown to promote bone-like apatite formation.
Its piezoelectric effect, which turns an external input into a biologically identifiable indication to direct formation and reabsorption process, is responsible for these characteristics.
Electrical polarization has a substantial impact on biomineralization in living species, and piezoelectric signals can affect collagen composition or be directly related to cellular activity.
Important results of the study
In this study, the team demonstrated that the architecture of Ca3 (PO4) 2 anisotropic nanowires, as well as the coating of gold NPs on their surface, can greatly improve piezocatalysis capabilities.
Colloidal Ca3 (PO4) 2 nanowires and nanowires with varying length-to-width ratios, as well as their conjugates with gold NPs were produced, and their piezoelectric capabilities were examined using piezoelectric response force images.
It was discovered that the anisotropic architecture of Ca3 (PO4) 2 nanowires can double the piezoelectric effect compared to nanospheric architectures and that the incorporation of gold NP can improve it tenfold, with a piezoelectric value. sustained at 72 pm / V, which is comparable to the reference tetragonal BaTiO3. This improved piezoelectric capacity has been shown to improve piezo catalysis processes tenfold.
Aqueous and water-soluble nanometer compounds were synthesized and converted to aqueous nanometer bioconjugates for the specific labeling of tumor cells, accompanied by remote cell-based ultrasound treatment through the production of reactive species. subcellular oxygen (ROS).
Future perspectives
The technique shown here can be developed to create Ca3 (PO4) 2 based structures for various biomedical purposes.
Aqueous functional NPs are being developed especially for cell labeling and targeting, accompanied by cellular treatment based on low ultrasound through the production of subcellular ROS. This discovery is expected to be used to develop and improve the currently inadequate piezocatalysis capacity of biomedically relevant nanostructures, as well as for other biological uses.
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Dolai, J., Biswas, A., Ray, R. and Jana, NR (2022). Improved piezocatalysis by calcium phosphate nanowires by conjugation of gold nanoparticles. Materials and interfaces applied ACS. Available at: https://doi.org/10.1021/acsami.2c05036
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