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Volumn 23, Issue 9, 2007, Pages 4862-4870

Patterning inorganic (CaCO3) thin films via a polymer-induced liquid-precursor process

Author keywords

[No Author keywords available]

Indexed keywords

COLLOIDAL DROPLETS; CONTINUOUS CALCITIC MINERAL FILMS; MICROCONTACT PRINTING TECHNIQUES; POLYMER INDUCED LIQUID PRECURSORS (PILP);

EID: 34248386789     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la061975l     Document Type: Article
Times cited : (95)

References (78)
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    • The size of the nanoclusters versus crystals appears contradictory, but this is an important feature to support the proposed mechanism. We do not believe that the single-crystalline texture arises from ordered arrays of nanocrystals, as has been observed in other systems.64 If this were the case, birefringence should be observed in the films at the earliest stage. Therefore, we have proposed that the PILP droplets are amorphous when deposited and sufficiently fluidic to coalesce into a continuous film prior to nucleation within the amorphous film. In this way, the fused droplets crystallize together during the amorphous to crystalline transformation of the film. Apparently, the PILP droplets (at least those at the surface) do not fully flow since cluster boundaries can be discerned
    • 64 If this were the case, birefringence should be observed in the films at the earliest stage. Therefore, we have proposed that the PILP droplets are amorphous when deposited and sufficiently fluidic to coalesce into a continuous film prior to nucleation within the amorphous film. In this way, the fused droplets crystallize together during the amorphous to crystalline transformation of the film. Apparently, the PILP droplets (at least those at the surface) do not fully flow since cluster boundaries can be discerned.
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    • In Figure 3A, although the (104) peak was dominant, it cannot be inferred that this was the only crystallographic orientation present because the amount of the sample that could be scraped from the substrate was limited, and scattering peaks other than the intense (104) were probably just too small to detect. We suspect a variety of crystallographic orientations are present because several single crystalline patches can be seen that have variable levels of birefringence while at maximum intensity positions and equivalent thicknesses, While polarized light microscopy cannot be used to determine orientation, future work using electron diffraction will examine the issue of templating crystallographic orientation
    • In Figure 3A, although the (104) peak was dominant, it cannot be inferred that this was the only crystallographic orientation present because the amount of the sample that could be scraped from the substrate was limited, and scattering peaks other than the intense (104) were probably just too small to detect. We suspect a variety of crystallographic orientations are present because several single crystalline patches can be seen that have variable levels of birefringence while at maximum intensity positions (and equivalent thicknesses). While polarized light microscopy cannot be used to determine orientation, future work using electron diffraction will examine the issue of templating crystallographic orientation.
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    • Based on this logic, one would expect the films at the bottom of the vial to be both thicker and composed of larger particles. Unfortunately, the thickness of the films and particle size was variable across the horizontal sections of the slide. For this reason, we did not try to quantify the particle sizes. Based on visual observations of the cloudiness within the vials, vertical paths of cloudiness can be seen as the droplets tend to congregate into streams as they settle note: the solution is not stirred, Pipet extractions of the streams of droplets show that they are larger the further down the vial they have traveled in the vertical section. Therefore, the observation of variable thickness across the horizontal sections is a result of the deposition of variable amounts of the droplets within streams of more concentrated regions. On the other hand, the reproducibility of increasing thickness in the vertical direction was consistent, and we therefore feel comfortable wi
    • Based on this logic, one would expect the films at the bottom of the vial to be both thicker and composed of larger particles. Unfortunately, the thickness of the films and particle size was variable across the horizontal sections of the slide. For this reason, we did not try to quantify the particle sizes. Based on visual observations of the cloudiness within the vials, vertical paths of cloudiness can be seen as the droplets tend to congregate into "streams" as they settle (note: the solution is not stirred). Pipet extractions of the streams of droplets show that they are larger the further down the vial they have traveled in the vertical section. Therefore, the observation of variable thickness across the horizontal sections is a result of the deposition of variable amounts of the droplets within streams of more concentrated regions. On the other hand, the reproducibility of increasing thickness in the vertical direction was consistent, and we therefore feel comfortable with our conclusion that the overall thickness of the films increased as the droplets settled further down the vertical height of the vial.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.