scholarly journals Polystyrene Microparticles with Convergently Grown Mesoporous Silica Shells as a Promising Tool for Multiplexed Bioanalytical Assays

Author(s):  
Charlie Tobias ◽  
Estela Climent ◽  
Kornelia Gawlitza ◽  
Knut Rurack
2019 ◽  
Vol 26 (31) ◽  
pp. 5745-5763 ◽  
Author(s):  
Fahima Dilnawaz

Background: Cancer is a widespread disease and has a high mortality rate. Popular conventional treatment encompasses chemotherapy, radiation and surgical resection. However, these treatments impart lots of toxicity problems to the patients mostly due to their non-selectiveness nature, which invokes drug resistances and severe side-effects. Objectives: In this regard, nanotechnology has claimed to be a smart technology that provides the system with the ability to target drugs to the specific sites. With the use of nanotechnology, various nanomaterials that are widely used as a drug delivery vehicle are created for biomedical applications. Amongst variously diversified nanovehicles, mesoporous silica nanoparticles (MSNs) have attracted enormous attention due to their structural characteristics, great surface areas, tunable pore diameters, good thermal and chemical stability, excellent biocompatibility along with ease of surface modification. Furthermore, the drug release from MSNs can be tailored through various stimuli response gatekeeper systems. The ordered structure of MSNs is extremely suitable for loading of the high amount of drug molecules with controlled delivery for targeting the cancer tissues via enhanced permeability and retention effect or further with surface modification, it can also be actively targeted by various ligands. Methods: The review article emphases the common synthetic methods and current advancement of MSNs usages for stimuli response drug delivery, immunotherapy as well as the theranostic ability for cancer. Conclusion: Although MSNs are becoming the promising tool for more efficient and safer cancer therapy, however, additional translational studies are required to explore its multifunctional ability in a clinical setting.


Author(s):  
D. R. Denley

Scanning tunneling microscopy (STM) has recently been introduced as a promising tool for analyzing surface atomic structure. We have used STM for its extremely high resolution (especially the direction normal to surfaces) and its ability for imaging in ambient atmosphere. We have examined surfaces of metals, semiconductors, and molecules deposited on these materials to achieve atomic resolution in favorable cases.When the high resolution capability is coupled with digital data acquisition, it is simple to get quantitative information on surface texture. This is illustrated for the measurement of surface roughness of evaporated gold films as a function of deposition temperature and annealing time in Figure 1. These results show a clear trend for which the roughness, as well as the experimental deviance of the roughness is found to be minimal for evaporation at 300°C. It is also possible to contrast different measures of roughness.


Nanoscale ◽  
2020 ◽  
Vol 12 (17) ◽  
pp. 9517-9523 ◽  
Author(s):  
Huizhen Fan ◽  
Yu Fan ◽  
Wenna Du ◽  
Rui Cai ◽  
Xinshuang Gao ◽  
...  

ICG forms aggregates in positively charged mesoporous silica, which show an enhanced type I photoreaction pathway.


2014 ◽  
Vol 75 (S 02) ◽  
Author(s):  
Beatriz Madero ◽  
P. Avan ◽  
A. Bazin ◽  
A. Chays ◽  
T. Mom ◽  
...  

2003 ◽  
Vol 775 ◽  
Author(s):  
G.V.Rama Rao ◽  
Qiang Fu ◽  
Linnea K. Ista ◽  
Huifang Xu ◽  
S. Balamurugan ◽  
...  

AbstractThis study details development of hybrid mesoporous materials in which molecular transport through mesopores can be precisely controlled and reversibly modulated. Mesoporous silica materials formed by surfactant templating were modified by surface initiated atom transfer radical polymerization of poly(N-isopropyl acrylamide) (PNIPAAm) a stimuli responsive polymer (SRP) within the porous network. Thermo gravimetric analysis and FTIR spectroscopy were used to confirm the presence of PNIPAAm on the silica surface. Nitrogen porosimetry, transmission electron microscopy and X-ray diffraction analyses confirmed that polymerization occurred uniformly within the porous network. Uptake and release of fluorescent dyes from the particles was monitored by spectrofluorimetry and scanning laser confocal microscopy. Results suggest that the presence of PNIPAAm, a SRP, in the porous network can be used to modulate the transport of aqueous solutes. At low temperature, (e.g., room temperature) the PNIPAAm is hydrated and extended and inhibits transport of analytes; at higher temperatures (e.g., 50°C) it is hydrophobic and is collapsed within the pore network, thus allowing solute diffusion into or out of the mesoporous silica. The transition form hydrophilic to hydrophobic state on polymer grafted mesoporous membranes was determined by contact angle measurements. This work has implications for the development of materials for the selective control of transport of molecular solutes in a variety of applications.


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