Nanocomposited silicone hydrogels with a laser-assisted surface modification for inhibiting the growth of bacterial biofilm

2015 ◽  
Vol 3 (16) ◽  
pp. 3234-3241 ◽  
Author(s):  
P. Yin ◽  
G. B. Huang ◽  
W. H. Tse ◽  
Y. G. Bao ◽  
J. Denstedt ◽  
...  
Keyword(s):  
Surface Modification ◽  
Bacterial Biofilm ◽  
Silicone Hydrogel ◽  
Silicone Hydrogels ◽  
Order Of Magnitude ◽  
Growth Of Bacteria

Compared to the commercial silicone catheters, the nanocomposited silicone hydrogel with a laser-assisted surface modification can reduce the growth of bacteria from 1.20 × 106 CFU cm−2 to 3.69 × 105 CFU cm−2, almost an order of magnitude.

Riboflavin Surface Modification of Poly(vinyl chloride) for Light-Triggered Control of Bacterial Biofilm and Virus Inactivation

2021 ◽  
Author(s):  
Marcelo Munoz ◽  
Antony El-khoury ◽  
Cagla Eren Cimenci ◽  
Mayte Gonzalez-Gomez ◽  
Robert A. Hunter ◽  
...  
Keyword(s):  
Surface Modification ◽  
Vinyl Chloride ◽  
Bacterial Biofilm ◽  
Virus Inactivation ◽  
Poly Vinyl Chloride

Surface modification of ZnO on the Zn-polar 0001 face by self-assembled triptycene-based polar molecules along with an increase of electric conductance

2022 ◽  
Author(s):  
Hiroki Shioya ◽  
Naoko Inoue ◽  
Masaro Yoshida ◽  
Yoshihiro IWASA
Keyword(s):  
Surface Modification ◽  
Critical Role ◽  
Polar Molecules ◽  
Hydroxyl Groups ◽  
Oxide Semiconductors ◽  
Assembled Monolayers ◽  
Temperature Dependences ◽  
Order Of Magnitude ◽  
Sheet Conductance ◽  
Self Assembled

Abstract Application of self-assembled monolayers (SAMs) is a representative method of surface modification for tuning material properties. In this study we examine the influence of the surface modification by coating the Zn-polar 0001 surface of ZnO single crystal with a SAM of triptycene-based polar molecules in our own technique and investigated temperature dependences of the sheet conductance of the surface with and without the SAM. The sheet conductance at 70 K with the SAM is increased by an order of magnitude, compared to the case without the SAM. We infer that the additional electrons are introduced at the surface by the polar triptycene molecules, whose electropositive hydroxyl groups are supposed to face toward the Zn-polar surface of ZnO. The present result implies that the molecular orientation of the triptycene SAM plays a critical role on the surface properties of oxide semiconductors.

scholarly journals Refractive behavior changes with six months daily wear of high and low oxygen permeability hydrogel contact lenses

2006 ◽  
Vol 65 (2) ◽  
Author(s):  
W.D.H. Gillan
Keyword(s):  
Oxygen Permeability ◽  
Contact Lenses ◽  
The Other ◽  
Behavior Changes ◽  
Low Oxygen ◽  
Soft Contact ◽  
Silicone Hydrogel ◽  
Refractive State ◽  
Soft Contact Lenses ◽  
Silicone Hydrogels

Introduction: The investigation of myopia and soft contact lenses is not new. Many reports show  that  the  wearing  of  silicone  hydrogel lenses as opposed to conventional disposable hydrogel lenses results in little progression of myopia in the eyes wearing silicone hydrogels. Method: Six subjects wore a silicone hydro-gel lens on one eye while the other eye wore a habitual disposable hydrogel lens for six months of daily wear. Fifty measurements of refractive state in each eye were taken prior to the subjects wearing a silicone lens in one eye and a conven-tional hydrogel lens in the other eye. After six months of daily wear another fifty measurements of refractive state were taken for each subject. Results:  Although  there  is  no  statisti-cal  support  for  the  findings  of  this  study, comet stereo-pairs are used to show the chang-es in refractive state for each subject. Four of  the  six  subjects  showed  an  increase  in myopia in the eye wearing the silicone lens. Discussion:  The  increase  in  myopia in eyes wearing a silicone hydrogel lens is contrary  to  the  findings  of  other  studies.

scholarly journals Impact of Air Exposure Time on the Water Contact Angles of Daily Disposable Silicone Hydrogels

2019 ◽  
Vol 20 (6) ◽  
pp. 1313 ◽  
Author(s):  
Petar Eftimov ◽  
Norihiko Yokoi ◽  
Nikola Peev ◽  
Georgi Georgiev
Keyword(s):  
Surface Coating ◽  
Sessile Drop ◽  
High Surface ◽  
Tear Film ◽  
Contact Angles ◽  
Water Contact ◽  
Air Exposure ◽  
Film Stability ◽  
Silicone Hydrogel ◽  
Silicone Hydrogels

The wettability of silicone hydrogel (SiHy) contact lens (CLs) is crucial for the pre-lens tear film stability throughout the day. Therefore, sessile drop and captive bubble setups were used to study the advancing and receding water contact angles (CA) of four SiHy materials: narafilcon A (TE), senofilcon A (AOD), stenfilcon A (MD), and delefilcon A (DT). TE and AOD have 48% and 38% water content, respectively, and no surface coating. MD (54% water) implements “smart chemistry” with just 4.4% bulk silicone content, while DT has >80% water at its surface. These SiHy were subjected to continuous blink-like air exposure (10 s)/rehydration (1s) cycles for 0, 1, 2, 3, 4, 6, 8, 10, 12, 14, and 16 h. The advancing CA, which measures the rehydration propensity of the CL surface, proved to be the most sensitive parameter to discriminate between the samples. The order of performance for the entire time scale was DT > MD >> AOD ≥ TE. The extended desiccation/rehydration cycling increased the differences between the CA of DT and MD compared to AOD and TE. This suggests that the low Si surface content and the high surface hydration are major determinants of SiHy wettability.

Improving hydrophilicity and protein resistance of silicone hydrogel by plasma induced graft polymerization of 2- methacryloyloxyethyl phosphorylcholine

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Fuqian Sun ◽  
Xinsong Li ◽  
Jinku Xu ◽  
Peiting Cao ◽  
Lijian Xiao
Keyword(s):  
Contact Angle ◽  
Graft Polymerization ◽  
Angle Measurement ◽  
Glow Discharge Plasma ◽  
Atmospheric Pressure Glow Discharge ◽  
Protein Resistance ◽  
Silicone Hydrogel ◽  
Protein Deposition ◽  
Silicone Hydrogels ◽  
Surface Graft

AbstractSurface properties of silicone hydrogels used as soft contact lenses play an important role in biocompatibility, conformability and deposition of protein. In this report, the surface hydrophilicity and protein deposition resistance of silicone hydrogel were modified using an atmospheric pressure glow discharge plasma (APGDP) induced graft polymerization of 2-methacryloyloxyethyl phosphoryl choline (MPC). Silicone hydrogel was treated with plasma and exposed to air to form oxide and hydroperoxides at the surface, which initiated surface graft polymerization of MPC. Elemental composition and structure at the surface of silicone hydrogel were characterized through ATR-FTIR and XPS. The data of ATR-FTIR and XPS analyses revealed that MPC was grafted onto the surface of silicone hydrogel. Contact angle measurement was used to evaluate the hydrophilic property of the silicone hydrogel. The MPC grafted silicone hydrogel has the contact angle about 55° when MPC solution with the concentration 10 wt% is applied for graft polymerization. The result showed that graft polymerzation of MPC improved the hydrophilicity of silicone hydrogel efficiently. Bovine serum albumin (BSA) was used as a model to investigate protein deposition resistance of the modified silicone hydrogel. The data obtained by bicinchoninic acid assay revealed that the grafted silicone hydrogels had a significant enhancement of protein resistance.

Reduction of Threading Dislocation Density in InN Film Grown with in situ Surface Modification by Radio-frequency Plasma-excited Molecular Beam Epitaxy

MRS Advances ◽  
2018 ◽  
Vol 3 (18) ◽  
pp. 931-936
Author(s):  
F. B. Abas ◽  
R. Fujita ◽  
S. Mouri ◽  
T. Araki ◽  
Y. Nanishi
Keyword(s):  
Surface Modification ◽  
Electrical Properties ◽  
Dislocation Density ◽  
Hall Effect Measurement ◽  
Threading Dislocation ◽  
X Ray ◽  
Transmission Electron ◽  
Threading Dislocation Density ◽  
Order Of Magnitude

ABSTRACTThe objective of this study was to investigate the relationship between the thickness of N radical irradiated InN template with crystallographic quality and electrical properties of InN film grown with the previously proposed method, in situ surface modification by radical beam irradiation. In this study, three InN samples were grown with this method on different thickness of irradiated templates. The crystallographic quality of InN films was analyzed by X-ray diffraction and the electrical properties were studied by Hall effect measurement. InN grown on 100 nm thick irradiated template shows lower full-width at half-maximum of X-ray rocking curves and lower carrier concentration compared to InN grown on 200 nm and 450 nm thick irradiated templates. Transmission electron microscopy revealed that threading dislocation density in the InN film decreased by an order of magnitude to ∼4.6×109cm-2. These results suggest that this method is possible for reduction of threading dislocation density in InN and the thickness of irradiated template should be minimized for higher crystallographic quality and electrical properties of the entire InN film.

A biomimetic approach to enhanced wettability of silicone hydrogel contact lenses using polybetaine surface modification

2012 ◽  
Vol 35 ◽  
pp. e9
Author(s):  
Alonzo D. Cook ◽  
Jun Li ◽  
Matt Skinner ◽  
Karen Schultz ◽  
Chris Loose ◽  
...  
Keyword(s):  
Surface Modification ◽  
Contact Lenses ◽  
Silicone Hydrogel ◽  
Biomimetic Approach

scholarly journals In vitro Inhibition of Biofilm Formation on Silicon Rubber Voice Prosthesis: Α Systematic Review and Meta-Analysis

ORL ◽  
2021 ◽  
pp. 1-20
Author(s):  
Alexios Tsikopoulos ◽  
Efi Petinaki ◽  
Charalampos Festas ◽  
Konstantinos Tsikopoulos ◽  
Gabriele Meroni ◽  
...  
Keyword(s):  
Surface Modification ◽  
Silicone Rubber ◽  
Subgroup Analysis ◽  
Biofilm Formation ◽  
Meta Analysis ◽  
Bacterial Biofilm ◽  
Biofilm Inhibition ◽  
Voice Prostheses ◽  
Significant Difference

<b><i>Introduction:</i></b> Biofilm formation on voice prostheses is the primary reason for their premature implant dysfunction. Multiple strategies have been proposed over the last decades to achieve inhibition of biofilm formation on these devices. The purpose of this study was to assess the results of the available in vitro biofilm inhibition modalities on silicone rubber voice prostheses. <b><i>Methods:</i></b> We conducted a systematic search in PubMed, Embase, and the Cochrane Central Register of Controlled Trials databases up to February 29, 2020. A total of 33 in vitro laboratory studies investigating the efficacy of different coating methods against <i>Candida</i>, <i>Staphylococcus</i>, <i>Streptococcus</i>, <i>Lactobacilli</i>, and <i>Rothia</i> biofilm growth on silicone rubber medical devices were included. Subgroup analysis linked to the type of prevention modality was carried out, and quality assessment was performed with the use of the modified CONSORT tool. <b><i>Results:</i></b> Data from 33 studies were included in qualitative analysis, of which 12 qualified for quantitative analysis. For yeast biofilm formation assessment, there was a statistically significant difference in favor of the intervention group (standardized mean difference [SMD] = −1.20; 95% confidence interval [CI] [−1.73, −0.66]; <i>p</i> &#x3c; 0.0001). Subgroup analysis showed that combined methods (active and passive surface modification) are the most effective for biofilm inhibition in yeast (SMD = −2.53; 95% CI [−4.02, −1.03]; <i>p</i> = 0.00001). No statistically significant differences between intervention and control groups were shown for bacterial biofilm inhibition (SMD = −0.09; 95% CI [−0.68, 0.46]; <i>p</i> = 0.65), and the results from the subgroup analysis found no notable differences between the surface modification methods. After analyzing data on polymicrobial biofilms, a statistically significant difference in favor of prevention methods in comparison with the control group was detected (SMD = −2.59; 95% CI [−7.48, 2.31]; <i>p</i> = 0.30). <b><i>Conclusions:</i></b> The meta-analysis on biofilm inhibition demonstrated significant differences in favor of yeast biofilm inhibition compared to bacteria. A stronger inhibition with the application of passive or combined active and passive surface modification techniques was reported.

Surface modification of an organic hessian substrate leads to shifts in bacterial biofilm community composition and abundance

2016 ◽  
Vol 219 ◽  
pp. 90-97 ◽  
Author(s):  
James S. Paterson ◽  
Samuel Ogden ◽  
Renee J. Smith ◽  
Marina W. Delpin ◽  
James G. Mitchell ◽  
...  
Keyword(s):  
Surface Modification ◽  
Community Composition ◽  
Bacterial Biofilm ◽  
Biofilm Community
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