A study on the interactions of cationic porphyrin with nano clay platelets in Layer-by-Layer (LbL) self assembled films

Bhattacharjee, J.; Banik, Soma; Hussain, Syed Arshad; Bhattacharjee, D.

doi:10.1016/j.cplett.2015.05.021

Cited by 8 publications

(4 citation statements)

References 29 publications

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“…22−24 Moreover, many organic molecules upon adsorption on the clay particles show sufficient changes in their UV−vis spectra to enable the differentiation between absorbed and unabsorbed species. 23,25 This is not the case for HEPD molecules used as additive for Laponite RD dispersions. The UV−vis spectra shown in Figure S5 (Supporting Information) reveal that the Rayleigh light scattering intensity is dominated for the sample prepared at 60 °C by a big number of platelets due to accelerated exfoliation.…”

Section: Resultsmentioning

confidence: 99%

“…The UV–vis spectra of the freshly prepared dispersions are shown in Figure S5 (Supporting Information), where the upper trace and lower trace correspond to the samples prepared at 20 and 60 °C, respectively. The UV–vis spectra revealed a broad featureless spectra that is typical of inorganic nanoparticles with no aggregation or flocculation during the measurement time. − Moreover, many organic molecules upon adsorption on the clay particles show sufficient changes in their UV–vis spectra to enable the differentiation between absorbed and unabsorbed species. , This is not the case for HEPD molecules used as additive for Laponite RD dispersions. The UV–vis spectra shown in Figure S5 (Supporting Information) reveal that the Rayleigh light scattering intensity is dominated for the sample prepared at 60 °C by a big number of platelets due to accelerated exfoliation.…”

Section: Resultsmentioning

confidence: 99%

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Peptizing Mechanism at the Molecular Level of Laponite Nanoclay Gels

et al. 2016

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In the presence of additives such as etidronic acid (1-hydroxyethane-1,1-diphosphonic acid, HEDP), a process of peptizing of Laponite clay gels takes place. The peptizing process at the molecular level was directly revealed by P andH high-resolution magic-angle sample spinning (HRMAS) NMR spectroscopy. Two NMR spectral components were detected and assigned to free etidronic acid and bound to the Laponite disk edges. Furthermore, with increase of temperature the ratio of bound-to-free etidronic acid increases. This thermal activation process could be explained by the increase in electrical polarization of the hydroxyl group at the edges and by the exfoliation of the tactoids that leads to more access to the additive molecules to the electrical charges of platelet edges. P HRNMR spectroscopy on sodium fluorohectorite with an aspect ratio of ∼750 shows a reduction of the bound etidronic acid molecules. Transmission electron microscopy (TEM), field-emission scanning microscopy (FESEM), UV-vis spectrophotometry, dynamic light scattering (DLS), and zeta potential results support the proposed peptizing mechanisms.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Peptizing Mechanism at the Molecular Level of Laponite Nanoclay Gels

et al. 2016

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“…4a(iv)). Indeed, in the presence of ionic species, LAPONITE s has weak positive charges on the edge and significant negative charges on the surface, 86 resulting in aggregation and the production of gels. 87,88 Thus, weak mechanical properties, i.e.…”

Section: Mechanical Properties Evaluationmentioning

confidence: 99%

Triple crosslinking conductive hydrogels with digitally printable and outstanding mechanical stability for high-resolution conformable bioelectronics

et al. 2022

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“…Последнее перекрывает все имеющиеся преимущества неорганических материалов для фотовольтаики [10]. Среди органических низкомолекулярных соединений наиболее перспективными являются производные порфина [11][12][13][14][15], фталоцианина [16][17][18][19], нафталоцианина [20] и субфталоцианина [21]. В последнее время субфталоцианины (SubPc) привлекают внимание исследователей, занимающихся созданием фотовольтаических устройств на основе низкомолекулярных комплексов.…”

Section: Introductionunclassified

Self-Organization of A2B Type Boron Subphthalocyanine in Floating Layers and Langmuir-Schaefer Films

Kazak¹,

Dubinina²,

Чаусов³

et al. 2021

Liq. Cryst. and their Appl.

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Получены плавающие слои и пленки Ленгмюра-Шеффера субфталоцианина бора A 2 B типа. Построены модели face-on и edge-on монослоевых упаковок исследуемого соединения на поверхности раздела фаз воздух/вода и рассчитаны геометрические характеристики данных упаковок. Установлено, что площадь, приходящаяся на одну молекулу в плотнейшем face-on монослое, равна 1,99 нм 2 (А мол = 1,99 нм 2 ), edge-on монослое -1,02 нм 2 (А мол = 1,02 нм 2 ). Изучены спектральные характеристики исследуемого соединения в хлороформе и в пленках Ленгмюра-Шеффера. В спектре пленки Ленгмюра-Шеффера по сравнению со спектром раствора в хлороформе полосы поглощения смещены в длинноволновую область и незначительно уширены. Данные изменения спектров пленок Ленгмюра-Шеффера мы объясняем наличием межмолекулярных π-π взаимодействий push-pull молекул субфталоцианина в этих пленках и хаотическим расположением агрегатов в них. Методом атомно-силовой микроскопии установлена толщина перенесенной пленки (d = 0,7 нм).Ключевые слова: субфталоцианин, модель надмолекулярной упаковки, плавающие слои, пленки Ленгмюра-Шеффера, атомно-силовая микроскопия, оптические свойства.

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A study on the interactions of cationic porphyrin with nano clay platelets in Layer-by-Layer (LbL) self assembled films

Cited by 8 publications

References 29 publications

Peptizing Mechanism at the Molecular Level of Laponite Nanoclay Gels

Peptizing Mechanism at the Molecular Level of Laponite Nanoclay Gels

Triple crosslinking conductive hydrogels with digitally printable and outstanding mechanical stability for high-resolution conformable bioelectronics

Self-Organization of A2B Type Boron Subphthalocyanine in Floating Layers and Langmuir-Schaefer Films

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