Laser Welding of Plastics

Klein, Rolf

doi:10.1002/9783527636969

Cited by 84 publications

(71 citation statements)

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“…The first group includes the thermophysical properties of the substrate. In this regard, and although a variety of plastics can be treated with CO 2 lasers [48], PMMA was selected because it presents high absorbance in the IR region (α ≈ 0.92), low heat capacity, and low conductance [49]. The second group of variables associated with the laser includes the incident power, lateral speed, frequency, and spot size.…”

Section: Resultsmentioning

confidence: 99%

Fast and versatile fabrication of PMMA microchip electrophoretic devices by laser engraving

Gabriel,

Coltro,

Garcia

2014

Electrophoresis

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This paper describes the effects of different modes and engraving parameters on the dimensions of microfluidic structures produced in PMMA using laser engraving. The engraving modes included raster and vector while the explored engraving parameters included power, speed, frequency, resolution, line-width and number of passes. Under the optimum conditions, the technique was applied to produce channels suitable for CE separations. Taking advantage of the possibility to cut-through the substrates, the laser was also used to define solution reservoirs (buffer, sample, and waste) and a PDMS-based decoupler. The final device was used to perform the analysis of a model mixture of phenolic compounds within 200 s with baseline resolution.

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Section: Resultsmentioning

confidence: 99%

Fast and versatile fabrication of PMMA microchip electrophoretic devices by laser engraving

Gabriel,

Coltro,

Garcia

2014

Electrophoresis

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“…With the uniform exposure to thermal energy in conventional annealing approaches, it is not possible to obtain different pore morphologies on a single substrate. In addition, traditional thermal treatment in furnaces or on hot plates requires temperatures of at least 250 ˚C [23]; thereby, rendering this technique incompatible with most plastic substrates with low melting temperatures [30].…”

Section: Template For Preparation Of Manuscripts For Nano Researchmentioning

confidence: 99%

Electrically tunable pore morphology in nanoporous gold thin films

Dorofeeva

Şeker

2015

Nano Res.

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Electrical current is used for tuning pore morphology of nanoporous gold thin films at significantly lower temperatures than previously reported via electrically-assisted mechanisms.This technique allows for precisely controlling the extent and location of pore coarsening and producing a wide range of distinct morphologies on a single substrate for high-throughput studies of structure-property relationships. ABSTRACTNanoporous gold (np-Au) is an emerging nanostructured material that exhibits many desirable properties, including high electrical and thermal conductivity, high surface area-to-volume ratio, tunable pore morphology, well-established surface-binding chemistry, and compatibility with microfabrication. These features made np-Au a popular material for fuel cells, optical and electrical biosensors, drug delivery vehicles, neural electrode coatings, and as a model system for nano-scale mechanics. In each application, np-Au morphology plays an essential role in the overall device operation. Therefore, precise control of morphology is necessary for attaining optimal device performance. Traditionally, thermal treatment in furnaces and on hot plates is used for obtaining np-Au with self-similar but coarser morphologies. However, this approach lacks the ability to create different morphologies on a single substrate and requires high temperatures (>250 °C) that are not compatible with most plastic substrates. Herein, we report electro-annealing as a method that for the first time makes it possible to control the extent and location of pore coarsening on a single substrate with one fast treatment step. In addition, the electro-annealing entails much lower temperatures (<150 °C) than traditional thermal treatment, putatively due to electrically-assisted phenomena that contribute to thermally-activated surface diffusion of gold atoms responsible for coarsening. Overall, this approach can be easily scaled up to display multiple pore morphologies on a single chip and therefore enable high-throughput screening of optimal nanostructures for specific applications.

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“…Poly woven bag was made of polypropylene (PP) and fluorescent brightening agents with special molecular structures (Chemnet, 2015). Generally, module cover is made of polyethylene (PE) or polyethylene terephthalate (PET) and stabilizer for polymers (Klein, 2011), resulting in significant spectral differences from lint and other FM categories. The differences between various FM and cotton lint largely attribute to bond vibration regions which are related to chemical components of FM and lint.…”

Section: Spectra Extraction and Normalizationmentioning

confidence: 99%

Shortwave infrared hyperspectral reflectance imaging for cotton foreign matter classification

Zhang

et al. 2016

Computers and Electronics in Agriculture

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Laser Welding of Plastics

Cited by 84 publications

References 0 publications

Fast and versatile fabrication of PMMA microchip electrophoretic devices by laser engraving

Fast and versatile fabrication of PMMA microchip electrophoretic devices by laser engraving

Electrically tunable pore morphology in nanoporous gold thin films

Shortwave infrared hyperspectral reflectance imaging for cotton foreign matter classification

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