A Structural Study of Amphiphilic PAMAM (Poly(amido amine)) Dendrimers in Langmuir and Langmuir–Blodgett Films

Sui, Guodong; Mabrouki, Mustapha; Ma, Yuanlin; Mićić, Miodrag; Leblanc, Roger M.

doi:10.1006/jcis.2002.8351

Cited by 22 publications

(20 citation statements)

References 27 publications

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“…Samples of dendrimers 6 ) for SPM measurements in a dry environment can be prepared according to manifold coating procedures: a) with wet-chemistry by spincoating [29] [30], by solution-casting [31], by building metal complexes on the surface [32], by techniques related to the Langmuir-Blodgett principle [33], or by electrostatic layer-by-layer deposition [34] and in b) high vacuum (HV) by electrospray [35]. Deposition by sublimation in c) ultra-high vacuum (UHV) with organic molecularbeam epitaxy is often not applicable to large molecules (in particular dendrimers) due to the thermal instability of the compounds.…”

mentioning

confidence: 99%

Hourglass‐Shaped Dendrimers on Surfaces: A Comparison of Different Scanning‐Tunneling‐Microscopy Approaches

Widmer

Hubler

Stöhr

et al. 2002

Helvetica Chimica Acta

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Dedicated to Professor Dieter Seebach on the occasion of his 65th birthday Large molecules adsorbed on surfaces can be analyzed by scanning tunneling microscopy (STM) under various environmental conditions: on a dry surface in air or vacuum, and at the solid-liquid interface. However, can measurements under dissimilar conditions be compared, e. g., when sample A was studied at the solid-liquid interface and sample B in a dry environment? Only rarely can the same substance be examined with more than one approach, since completely different set-up and preparations are necessary. Furthermore, few substances are suitable for several methods of sample preparation and characterization. We have chosen a large, flexible, nonplanar molecule, namely an alkoxy-substituted second-generation dendritic compound with a chiral core unit, which is peculiar for its −hourglass× conformation. The assembly properties have been explored by STM both in solution-cast self-organized monolayers (SOMs) and multilayer films, as well as at the solid-liquid interface. The complexity and limits of the three approaches applied to our hourglass-shaped dendritic compound are discussed. Depending on the approach and environmental conditions, several quality levels of image resolution could be achieved; measurements carried out at low temperatures led to highest resolution on the aromatic parts of the molecule. A comparison of equally sized images obtained under these varying conditions reveals not only different packing arrangements, but also spots of unlike shape. Therefore, when the approach, preparation, and/or environmental conditions are not the same, STM measurements of different compounds have to be compared with greatest care.

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mentioning

confidence: 99%

Hourglass‐Shaped Dendrimers on Surfaces: A Comparison of Different Scanning‐Tunneling‐Microscopy Approaches

Widmer

Hubler

Stöhr

et al. 2002

Helvetica Chimica Acta

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“…However, there was some kind of hydrophobic groups which had a high affinity to the fundamental hydrophobic ester structure on LDL lipoprotein-cholesterol [5]. Amphiphilic molecular PAMAM [8,9] has long carbon chain which is hydrophobic, but the alkyl amino ending prevented the approach of cation LDL lipoprotein and resulted in no affinity to LDL. Here, the affinity ability changed a lot and markedly when using taurine to replace the amino groups on PAMAM.…”

Section: Effect Of Taurine Linkage To Ldl Adsorptionmentioning

confidence: 98%

“…It has been shown that the character and length of spacer efficiently affects the adsorption capacity of the adsorbent [6]. Recently, substantial effort has been focused on the biomedical applications of dendrimers [7][8][9]. In view of the extraordinary structure control and nanoscale dimensions observed for dendrimers, it is not surprising to find extensive interest in their use as globular protein mimics.…”

Section: Introductionmentioning

confidence: 99%

LDL adsorbent with dendrimer PAMAM as spacer

Yuan

Wang

2008

Front. Chem. Eng. China

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Dendritic polymers are three-dimensional, highly ordered compounds formed by reiterative reaction sequences, and via discrete stages referred to as generations. To study the spacer effect of low density lipoprotein (LDL) adsorbent, we linked dendrimer polyamidoamine (PAMAM) generation 1 (G1), generation 3 (G3) and generation 5 (G5) to cellulose beads, respectively, and then determined the adsorption proportion of the adsorbents with PAMAM decorated with taurine. The result shows that the spacer with activated multi-points could efficiently improve the adsorption capacity of the adsorbent.

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“…On the other hand, from the surface potential versus molecular area behavior of PAMAM dendrimers with 12‐hydroxydodecyl terminals, it is suggested that the dendrimers take an ‘edge‐on’ conformation in the monolayer at the air–water interface, as the surface pressure increases (Fig. 1(c)) 36. These PAMAM dendrimer molecules lie sideways in the Langmuir film to make packed columnar structures.…”

Section: Planar Hierarchy Of Dendritic Polymersmentioning

confidence: 99%

Hierarchical structures of dendritic polymers

Ujihara

Imae

2009

Polymer International

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Dendritic polymers' highly specific and three‐dimensional architectures set them apart from linear and slightly branched polymers. Their unique properties also allow them to form hierarchical organizations, which can be classified as planar or non‐planar. The preparation of a planar hierarchy consisting of dendritic polymers can be achieved by conventional techniques of adsorption or Langmuir monolayer and Langmuir–Blodgett accumulation, and the resultant hierarchy is well ordered. Non‐planar hierarchies are built on non‐planar scaffolds, for example by self‐assembly. In this mini‐review, the practical/potential applications of dendritic polymers such as for electrical or optical devices, sensing systems, or medical diagnosis are also reviewed in association with their structures. Copyright © 2009 Society of Chemical Industry

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A Structural Study of Amphiphilic PAMAM (Poly(amido amine)) Dendrimers in Langmuir and Langmuir–Blodgett Films

Cited by 22 publications

References 27 publications

Hourglass‐Shaped Dendrimers on Surfaces: A Comparison of Different Scanning‐Tunneling‐Microscopy Approaches

Hourglass‐Shaped Dendrimers on Surfaces: A Comparison of Different Scanning‐Tunneling‐Microscopy Approaches

LDL adsorbent with dendrimer PAMAM as spacer

Hierarchical structures of dendritic polymers

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