Manipulating fluorescence characteristics of conjugated fluorescent molecules incorporated into three-dimensional poly(methyl methacrylate) opal photonic crystals

The three-dimensional nano-morphology of poly(methyl methacrylate; PMMA) microcapsules filled with carbon nanotubes (CNTs) and epoxy resin were investigated by various microscopy methods, including a novel, laser scanning confocal microscopy (LSCM) method. Initially, PMMA microcapsules containing various amounts of CNTs were synthesized by a solvent evaporation method. Scanning electron microscopy analysis showed that pore-free, smooth-surface microcapsules formed with various types of core-shell morphologies. The average size of CNT/epoxy/PMMA microcapsules was shown to decrease from ~52 μm to ~15 μm when mixing speed during synthesis increased from 300 rpm to 1000 rpm. In general, the presence of CNTs resulted in slightly larger microcapsules and higher variations in size. Moreover, three-dimensional scans obtained from confocal microscopy revealed that higher CNT content increased the occurrence and size of CNT aggregates inside the microcapsules. Entrapped submicron air bubbles were also observed inside most microcapsules, particularly within those with higher CNT content.

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Poly(methyl methacrylate) Coating of Titanium Workpieces to Reduce Burrs in Micro-drilling

Micromachines ◽

10.3390/mi10120838 ◽

2019 ◽

Vol 10 (12) ◽

pp. 838

Author(s):

Luca Giorleo

Keyword(s):

Methyl Methacrylate ◽

Three Dimensional ◽

Titanium Sheet ◽

Burr Height ◽

Poly Methyl Methacrylate ◽

Drill Bits ◽

Micro Drilling ◽

Quantitative Analyses ◽

Uncoated Titanium ◽

Titanium Specimen

A technique to reduce burr height in titanium micro-drilling is presented: a poly (methyl methacrylate) coating was applied before machining on the upper and lower surfaces of a titanium specimen (0.5-mm thick). After drilling, a cleaning process (acetone bath) was executed to eliminate the coating, and holes with less burr were obtained. The coating process was executed with a spin-coating machine. To test the efficacy of the technique, two different coating thicknesses (7.9 and 5.4 μm) and two drill bits (0.25- and 0.5-mm diameter) were evaluated. Qualitative and quantitative analyses of the holes obtained were performed with scanning electron microscopy and three-dimensional microscopy, respectively. The results highlight the efficacy of the technique to reduce the burr height by 70% in coated titanium relative to that in an uncoated titanium sheet.

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Hollow three-dimensional graphene reinforced with poly (methyl methacrylate) for selective absorption of oil

Fullerenes Nanotubes and Carbon Nanostructures ◽

10.1080/1536383x.2020.1821667 ◽

2020 ◽

pp. 1-7

Author(s):

Chong Cheen Ong ◽

Norani Muti Mohamed ◽

Mohamed Shuaib Mohamed Saheed

Keyword(s):

Methyl Methacrylate ◽

Three Dimensional ◽

Selective Absorption ◽

Poly Methyl Methacrylate

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Three-Dimensional Optical Bit Memory in Sm(DBM)3Phen-Doped and Un-Doped Poly(methyl methacrylate)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.284-286.2251 ◽

2011 ◽

Vol 284-286 ◽

pp. 2251-2254

Author(s):

Zhao Gang Nie ◽

Xin Zhong Li ◽

Yu Ping Tai ◽

Ki Soo Lim ◽

Myeongkyu Lee

Keyword(s):

Refractive Index ◽

Methyl Methacrylate ◽

Signal To Noise Ratio ◽

Three Dimensional ◽

Pulsed Laser ◽

High Signal ◽

Signal To Noise ◽

Fluorescent Signal ◽

Poly Methyl Methacrylate ◽

Noise Ratio

The feasibility of three-dimensional optical bit memory is demonstrated by using the change of fluorescence and refractive index in Sm(DBM)3Phen-doped and un-doped Poly(methyl methacrylate). After a femtosecond pulsed laser irradiation, a refractive-index bit and a fluorescent bit can be formed at the same position inside the bulk sample. Multilayer patterns recorded by tightly focusing the pulsed laser beam were read out by a reflection-type fluorescent confocal microscope, which can detect the reflection signal and also the fluorescent signal of the stored bits. The signal-to-noise ratio via the two retrieval modes was compared as a function of recording depth. The stored bits were retrieved with a high signal-to-noise ratio in the absence of any crosstalk and the detection of the fluorescent signal enables retrieval of the stored bits with a higher S/N ratio.

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