Photopyroelectric Microscopy of Plant Leaves

Briseño-Tepepa, Blanca R.; Jiménez-Pérez, J. L.; Saavedra, R.; González-Ballesteros, R.; Suaste, E.; Cruz‐Orea, A.

doi:10.1007/s10765-007-0262-3

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…It is known that heat transfer between a plant and its environment is essentially through the following three processes: (1) conduction and convection due to direct contact with air, (2) evaporation of water in the form of latent heat, and (3) heat loss through radiation [1]. Though heat transfer from plants to the environment, which is determined by thermal properties of leaves, is a very old problem, new results still continue to appear on this subject [2]. We try to look at this issue from a new angle and analyze it from the point of view of the thermal effusivity or thermal inertia, which is the inverse of the thermal impedance, for plant leaves.…”

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“…Correspondingly, a sample with a low thermal effusivity, once heated to a temperature, will take a longer time to reach the temperature of the environment compared to a sample with a high thermal effusivity heated to the same temperature. The thermal effusivity e is related to other thermal properties through the relation, e = λρC p (2) and has units of W · s 1/2 · m −2 · K −1 .…”

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Thermophysical Properties of Plant Leaves and Their Influence on the Environment Temperature

Jayalakshmy

Philip

2010

Int J Thermophys

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It is known that the thermal properties of a material influence the temperature around it. Once heated, the rate at which a material transfers the absorbed heat into the surroundings is determined by the thermal effusivity (or thermal inertia) of the material, and it depends on the well-known thermal properties, thermal conductivity, and specific heat capacity. Since a direct measurement of these properties is rather difficult for thin biological specimens such as plant leaves, a photothermal technique is used to measure the thermal effusivity, thermal diffusivity, thermal conductivity, and specific heat capacity for a few representative species of plant leaves. Measurements have been carried out on fresh as well as dry leaves to estimate the differences in their properties. Thermal properties of plant leaves are compared with the corresponding properties of two materials abundant in the environment and discussed. The influence of thermal properties, particularly the thermal effusivity and specific heat capacity, of plant leaves on controlling the temperature of the environment around them is discussed.

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Thermophysical Properties of Plant Leaves and Their Influence on the Environment Temperature

Jayalakshmy

Philip

2010

Int J Thermophys

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“…Photothermal microscopy (PTM) can be used with great advantage in biological studies since this technique is capable to obtain thermal images, through a non-destructive evaluation [1]. PTM allows the acquisition of thermal and optical images of samples with inhomogeneous structures such as agricultural seeds.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Wheat and Maize Seeds by Photoacoustic Microscopy

et al. 2009

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In this study photoacoustic microscopy (PAM) was used to evaluate the deterioration of wheat and maize seeds. The analyzed seeds were obtained from different productive cycles. In the PAM experimental setup a modulated focused laser beam impinges on the sample. Due to the periodic heating it is possible to obtain a photoacoustic signal (PA) by using a microphone sensor; from this sensor an electrical signal is obtained due to the temperature variation in the sample. Since there are local differences in seed structure, the optical absorption of the laser beam and thermal properties are inhomogeneous, which produces a different PA signal in each point of the sample. By taking the set of the obtained PA signals as a function of their positions, it is possible to obtain a PA image. The image resolution was 50 µm for 2037 each seed. Therefore, the main objective of the present study was to obtain PA images of wheat and maize seeds, from different productive cycles (i.e., from different annual cycles). The analysis has shown that PAM is an alternative technique to evaluate seed deterioration. Also, the optical absorption spectra of these seeds were obtained by PA spectroscopy.

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“…Along with its inherent sensitivity, other attractive features of PAS are minimal sample preparation requirements and non-destructive procedure. In addition to obtaining spectra for identification purposes or fundamental spectral characterization, quantitative analysis by PAS had proven to be an effective tool, specially suitable for liquid or highly absorbing samples [16][17][18][19][20][21][22]. Particularly, determination of trace amount of Pd using PAS had been described by converting the sample from a solution to a solid film [23,24].…”

Section: Introductionmentioning

confidence: 99%