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The synthesis of chemically clean and environmentally friendly nanoparticles through pulsed laser ablation in liquids has shown a number of advantages over conventional chemical synthesis methods and has evolved into a thriving research field attracting laboratory and industrial applications. The fundamental understanding of processes leading to the nanoparticle generation, however, still remains elusive. In particular, the origin of bimodal nanoparticle size distributions in femto- and picosecond laser ablation in liquids, where small nanoparticles (several nanometers) with narrow size distribution are commonly observed to coexist with larger (tens to hundreds of nanometers) ones, has not been explained so far. In this paper, joint computational and experimental efforts are applied to understand the mechanisms of nanoparticle formation in picosecond laser ablation in liquids and to explain the bimodal nanoparticle size distributions. The results of a large-scale atomistic simulation reveal the critical role of the dynamic interaction between the ablation plume and the liquid environment, leading to the generation of large nanoparticles through a sequence of hydrodynamic instabilities at the plume-liquid interface and a concurrent nucleation and growth of small nanoparticles in an expanding metal-liquid mixing region. The computational predictions are supported by a series of stroboscopic videography experiments showing the emergence of small satellite bubbles surrounding the main cavitation bubble generated in single pulse experiments. Carefully timed double pulse irradiation triggers expansion of secondary cavitation bubbles indicating, in accord with the simulation results, the presence of localized sites of laser energy deposition (possibly large nanoparticles) injected into the liquid at the early stage of the bubble formation.
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http://dx.doi.org/10.1039/C7NR08614H | DOI Listing |
ACS Appl Mater Interfaces
December 2024
Centre for Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247667, India.
Copper-based sulfides are attractive candidates for NIR I and II responsive photothermal therapy but often suffer from high hydrophobicity, suboptimal photothermal conversion, and poor biostability and biocompatibility. In the present work, a rapid, one-pot synthesis method was developed to obtain Au-doped CuS (ACSH NDs) dual plasmonic nanodots. ACSH NDs exhibit excellent peroxidase-like catalytic activity for pH-responsive OH radical generation along with efficient glutathione depletion under tumor microenvironment mimicking conditions.
View Article and Find Full Text PDFInt J Nanomedicine
December 2024
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, 999077, People's Republic of China.
Background: The lymphatic system is the major route of cancer metastasis, and sentinel lymph nodes (SLNs) are the first station for the spread of cancer cells. Accurate identification of SLNs by tracers during surgery is crucial for SLN biopsy and lymphadenectomy. However, conventional monomodal tracers such as blue dyes and carbon nanoparticles often induce a misjudgment of SLNs and thus are still unsatisfying for clinical applications.
View Article and Find Full Text PDFClin Cosmet Investig Dermatol
December 2024
Department of Dermatology, The People's Hospital of Baoshan/Fifth Affiliated Hospital of Dali University, Baoshan, Yunnan, People's Republic of China.
Background: Acne is a common inflammatory dermatosis. Although gender-related differences in prevalence and age of onset have been documented. Other gender-related characteristics of acne have not been well elucidated yet.
View Article and Find Full Text PDFACS Appl Bio Mater
December 2024
Department of Biomedical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Hyderabad 502285, India.
Triple-negative breast cancer (TNBC) is known for its aggressive nature, typically presenting as high-grade tumors that grow and spread quickly in all breast cancer types. Several studies have reported a strong correlation between cancer and microbial infections due to a compromised immune system. The most frequent infection associated with surface malignancies, including breast cancer, is Candidiasis, which is majorly caused by .
View Article and Find Full Text PDFBMC Biotechnol
December 2024
Department of Microbiology, Faculty of Veterinary and Agriculture, Islamic Azad University, Shabestar Branch, Shabestar, Iran.
Introduction: Breast cancer, a formidable global health challenge for women, necessitates innovative therapeutic strategies with enhanced efficacy and minimal side effects. Aripiprazole (ARI), a widely used schizophrenia medication, exhibits promising potential in the treatment of breast cancer. As cancer therapy evolves towards a combination approach, multimodal nano-based delivery systems, such as ARI-loaded niosomes (NIOs) combined with Chitosan-Au nanoparticles for chemo-photothermal therapy, show promise over traditional chemotherapy alone by enhancing targeted efficacy and minimizing side effects.
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