Characterization of bromocresol green and resin as holographic film

Ibarra, J.; Ortíz-Gutiérrez, Mauricio; Alonso-Magaña, P.

doi:10.1016/j.optmat.2004.06.003

Cited by 11 publications

(5 citation statements)

References 8 publications

(5 reference statements)

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“…For example, BG was used in pH-sensitive holographic film [25]. Several pH indicators [Bromocresol Green (BG), Bromocresol Purple (BP), and Thymol Blue (TB)] with different pH ranges for colour change were used to exhibit pH sensitivity of PU.…”

Section: Introductionmentioning

confidence: 99%

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Water‐compatible, pH‐sensitive, colour‐changing polyurethane with low‐temperature flexibility

Chung

Jung

Chun

2017

Coloration Technology

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A pH indicator (Bromocresol Green, Bromocresol Purple, or Thymol Blue) is grafted onto polyurethane (PU) using 2,2-dimethylolpropanoic acid (DMPA) to enhance water compatibility. The indicator-grafted, watercompatible PU is analysed for soft-segment thermal, tensile, and shape recovery properties, fast colour change depending on various pH conditions, and low-temperature flexibility. The PU surface becomes water compatible as DMPA content increases, and the characteristic UV-vis absorbance is observed for each grafted indicator. The PU series exhibits a sharp increase in tensile stress and crosslink density at low DMPA content, but a decrease with increased DMPA content. The glass transition temperature increases significantly with increased DMPA content. Shape recovery remains high, but shape retention sharply decreases after an indicator is grafted. The grafting of pH indicator onto PU improves the low-temperature flexibility and imparts an immediate colour change according to the solution pH and grafted indicator.

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Section: Introductionmentioning

confidence: 99%

“…The pH indicators have previously been used to develop pH‐sensitive polymers. For example, BG was used in pH‐sensitive holographic film . BP was used in pH‐sensitive electrospun polyamide nanofibres .…”

Section: Introductionmentioning

confidence: 99%

Water‐compatible, pH‐sensitive, colour‐changing polyurethane with low‐temperature flexibility

Chung

Jung

Chun

2017

Coloration Technology

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“…The color of BG solution changes from yellow to blue over the pH range of 3.8–5.4 [17]. The Al-MCM-41(50)/BG impregnation process was evaluated under different ratios of BG to Al-MCM-41(50) as well as different process times and temperatures.…”

Section: Methodsmentioning

confidence: 99%

“…The dye bromocresol green (BG, 2,6-dibromo-4-[7-(3,5-dibromo-4-hydroxy-2-methylphenyl)-9,9-dioxo-8-oxa-9λ6-thiabicyclo[4.3.0]nona-1,3,5-trien-7-yl]-3-methylphenol) is a weak organic acid whose absorbance spectrum is quite different from that of its conjugate base. The color of BG solution changes from yellow to blue over the pH range of 3.8–5.4 [ 17 ]. The Al-MCM-41(50)/BG impregnation process was evaluated under different ratios of BG to Al-MCM-41(50) as well as different process times and temperatures.…”

Section: Methodsmentioning

confidence: 99%

Bromocresol Green/Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing Instrument

Chang

Bai

et al. 2011

Sensors

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A meso-structured Al-MCM-41 material was impregnated with bromocresol green (BG) dye and then incorporated into a UV-Vis DRA spectroscopic instrument for the online detection of ammonia gas. The absorption response of the Al-MCM-41/BG ammonia sensing material was very sensitive at the optical absorption wavelength of 630 nm. A high linear correlation was achieved for ppmv and sub-ppmv levels of ammonia gas. The response time for the quantitative detection of ammonia gas concentrations ranging from 0.25 to 2.0 ppmv was only a few minutes. The lower detection limit achieved was 0.185 ppmv. The color change process was fully reversible during tens of cycling tests. These features together make this mesoporous Al-MCM-41 material very promising for optical sensing applications.

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“…A bromocresol green solution changes its color from yellow to blue over the pH range of 3.8-5.4 (Ibarra et al, 2004). The dye impregnating procedure was performed as follows: 0.001 g of bromocresol green powder (Acros Organics Co., USA) and 100 mL of acetone (Merck & Co., Inc., Germany) were mixed and stirred for 10 min.…”

Section: Impregnation Of Bromocresol Green Indicatormentioning

confidence: 99%

Development of regenerative dye impregnated mesoporous silica materials for assessing exposure to ammonia

Chang

Bai

Chiang

et al. 2012

Journal of the Air & Waste Management Association

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The mesostructured materials MCM-41 and SBA-15 were studied as possible supports of bromocresol green (BG) dye impregnation for the ammonia gas detection because of their large surface area, high regenerative property, and high thermal stability. X-ray diffraction, transmission electron microscopy, scanning electron microscope, and N 2 adsorption analysis were used to characterize the prepared materials. These materials could sense ammonia via visible color change from yellowish-orange to blue color. The color change process of the nanostructured materials was fully reversible during 10 cyclic tests. The results indicated that the ammonia absorption responses of the two nanostructured materials were both very sensitive, and high linear correlation and high precision were achieved. As the gaseous ammonia concentrations were 50 and 5 ppmv, the response times for the SBA-15/BG were only 1 and 5 min, respectively. Moreover, the BG dye-impregnated SBA-15 was less affected by the variation in the relative humidity. It also had faster response for the detection of NH 3 , as well as lower manufacturing price as compared to that of the dyeimpregnated MCM-41. Such feature enables SBA-15/BG to be a very promising material for the detection of ammonia gas. Implications:The detector tube is a convenient ambient ammonia detection device. However, almost all the commercial detector tubes can be used once only, which not only increases the purchase cost but also produces lots of waste. In this study, we developed two sensing materials that are sensitive for repeated usage. The two mesoporous silica-based materials, MCM-41 and SBA-15, are impregnated by an organic dye of bromocresol green to induce color change behavior that can be easily observed by the naked eye, and it is concluded that dye-impregnated SBA-15/BG is a very promising material for the detection of ammonia gas.

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Characterization of bromocresol green and resin as holographic film

Cited by 11 publications

References 8 publications

Water‐compatible, pH‐sensitive, colour‐changing polyurethane with low‐temperature flexibility

Water‐compatible, pH‐sensitive, colour‐changing polyurethane with low‐temperature flexibility

Bromocresol Green/Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing Instrument

Development of regenerative dye impregnated mesoporous silica materials for assessing exposure to ammonia

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