Nanojoules, nanoliters and nanosecond calorimetry

Autrey, Tom; Foster, Nancy S.; Klepzig, K.

doi:10.1016/s1010-6030(99)00054-4

Cited by 9 publications

(7 citation statements)

References 25 publications

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“…Autrey et al have described a nanoliter time-resolved calorimetric experimental approach using a photoacoustic cell made from narrow bore, flexible, (11) fused silica capillary tubing. 55 The fused silica capillary permits the transmission of an excitation source from the far UV to the near infrared. This geometry has proven to be capable of detecting with high sensitivity kinetics in the nanosecond range and allowed pressure-dependent investigations (vide infra).…”

Section: Instrumental Developmentsmentioning

confidence: 99%

Time-resolved photothermal methods: accessing time-resolved thermodynamics of photoinduced processes in chemistry and biology

Gensch

Viappiani

2003

Photochem Photobiol Sci

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Photothermal methods are currently being employed in a variety of research areas, ranging from materials science to environmental monitoring. Despite the common term which they are collected under, the implementations of these techniques are as diverse as the fields of application. In this review, we concentrate on the recent applications of time-resolved methods in photochemistry and photobiology.

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Section: Instrumental Developmentsmentioning

confidence: 99%

Time-resolved photothermal methods: accessing time-resolved thermodynamics of photoinduced processes in chemistry and biology

Gensch

Viappiani

2003

Photochem Photobiol Sci

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“…Two different experimental geometries were commonly used in laser pulsed PAC: (1) a cuvette cell with the piezoelectric detector acoustically coupled parallel to the incident excitation beam, and (2) a front-face irradiation or layered reflector cell with the piezoelectric detector acoustically coupled to a dielectric reflector normal to the incident excitation beam. 163, 164 A new experimental PAC cell geometry that uses a pair of prisms has been described. This novel layered prism cell design increases the PAC flexibility by combining the enhanced time resolution provided by the layered cell with the broadband tunability and "zero" background benefits of the cuvette cell.…”

Section: Photoacoustic Calorimetrymentioning

confidence: 99%

6 Recent developments in calorimetry

Randzio

2002

Annu. Rep. Prog. Chem., Sect. C: Phys. Chem.

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“…Photoacoustic measurem ents were m ade with the same lasers, ampli cation, and electronics described previously. 31 Laser excitation was with 308 or 355 nm light, usually at 250 to 300 m J per pulse. A TASC 300 sample chamber (Quantum Northwest) housed a 1 MHz transducer (Panametrics V103) interfaced with silicone grease to a standard 1 cm 3 1 cm quartz cuvette.…”

Section: Exp Erim Entalmentioning

confidence: 99%

“…2. W hile other sample cell types are available for photoacoustic experiments, 16,18,31 the standard 1 cm 3 1 cm cuvette offered the best data sets for analyzing the origins of signals from scattered and absorbed light. In Fig.…”

Section: Photoacoustic Signal Generation and Measurem Entmentioning

confidence: 99%

“…As the beam is broadened, the acoustic signals arising from absorption events within it destructively interfere, reducing signal intensity. This problem, characteristic of the simple right-angle cuvette-transducer arrangement, may be overcome by using a different photoacoustic sample cell-for example, the layered prism cell, 16,31 which implements a m ore ef cient approach to signal generation.…”

Section: Fig 4 Experimental Demonstration Of the Concepts Inmentioning

confidence: 99%

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Listening to Colloidal Silica Samples: Simultaneous Measurement of Absorbed and Scattered Light Using Pulsed-Laser Photoacoustics

et al. 2000

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Laser photoacoustic spectroscopy (LPAS) has been used to simultaneously measure scattered light and absorbed light with the use of a single piezoelectric transducer detector. Samples of Ludox™ colloidal silica, with and without added potassium chromate, were illuminated with pulses of 308 or 355 nm light. Signals were measured with a 1 MHz ultrasonic transducer clamped to the side of the cuvette. The resulting oscilloscope tracing shows a pattern of signals originating from light scatter and light absorption that is consistent with experimental geometry and the speeds of light and sound, and linear with incident laser pulse energy. The absorbed light signals are independent of the distance of the laser beam from the transducer, while the scattered light signals are strongly distance-dependent. The absorbed light signals are more indicative of true sample absorbance than are readings from a standard spectrophotometer. A spectrophotometer sums contributions from scattering and absorbance to give an optical density reading, while LPAS separates scattering from absorbance to give quantitative information on each function. Scattered light and fluorescent light behave very similarly in the LPAS technique. Our experiments were done with well-characterized colloidal silica samples, but the technique is readily extended to larger, more heterogeneous, and photochemically complex biological and environmental samples.

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Nanojoules, nanoliters and nanosecond calorimetry

Cited by 9 publications

References 25 publications

Time-resolved photothermal methods: accessing time-resolved thermodynamics of photoinduced processes in chemistry and biology

Time-resolved photothermal methods: accessing time-resolved thermodynamics of photoinduced processes in chemistry and biology

6 Recent developments in calorimetry

Listening to Colloidal Silica Samples: Simultaneous Measurement of Absorbed and Scattered Light Using Pulsed-Laser Photoacoustics

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