Relevant bibliographies by topics / Amphiphilic Stimuli

Academic literature on the topic 'Amphiphilic Stimuli'

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Published: 6 September 2023

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Journal articles on the topic "Amphiphilic Stimuli"

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R. Ramireddy, Rajasekhar, Krishna R. Raghupathi, Diego Amado Torres, and S. Thayumanavan. "Stimuli sensitive amphiphilic dendrimers." New Journal of Chemistry 36, no. 2 (2012): 340. http://dx.doi.org/10.1039/c2nj20879b.

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Cretu, Carmen, Loredana Maiuolo, Domenico Lombardo, Elisabeta I. Szerb, and Pietro Calandra. "Luminescent Supramolecular Nano- or Microstructures Formed in Aqueous Media by Amphiphile-Noble Metal Complexes." Journal of Nanomaterials 2020 (October 13, 2020): 1–24. http://dx.doi.org/10.1155/2020/5395048.

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The involvement of metal ions within the self-assembly spontaneously occurring in surfactant-based systems gives additional and interesting features. The electronic states of the metal, together with the bonds that can be established with the organic amphiphilic counterpart, are the factors triggering new photophysical properties. Moreover, the availability of stimuli-responsive supramolecular amphiphile assemblies, able to disassemble in a back-process, provides reversible switching particularly useful in novel approaches and applications giving rise to truly smart materials. In particular, small amphiphiles with an inner distribution, within their molecular architecture, of various polar and apolar functional groups, can give a wide variety of interactions and therefore enriched self-assemblies. If it is joined with the opportune presence and localization of noble metals, whose chemical and photophysical properties are undiscussed, then very interesting materials can be obtained. In this minireview, the basic concepts on self-assembly of small amphiphilic molecules with noble metals are shown with particular reference to the photophysical properties aiming at furnishing to the reader a panoramic view of these exciting problematics. In this respect, the following will be shown: (i) the principles of self-assembly of amphiphiles that involve noble metals, (ii) examples of amphiphiles and amphiphile-noble metal systems as representatives of systems with enhanced photophysical properties, and (iii) final comments and perspectives with some examples of modern applications.
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Guo, Wenjuan, Tieshi Wang, Xinde Tang, Qun Zhang, Faqi Yu, and Meishan Pei. "Triple stimuli-responsive amphiphilic glycopolymer." Journal of Polymer Science Part A: Polymer Chemistry 52, no. 15 (May 4, 2014): 2131–38. http://dx.doi.org/10.1002/pola.27222.

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Ramireddy, Rajasekhar R., Krishna R. Raghupathi, Diego Amado Torres, and S. Thayumanavan. "ChemInform Abstract: Stimuli Sensitive Amphiphilic Dendrimers." ChemInform 43, no. 22 (May 3, 2012): no. http://dx.doi.org/10.1002/chin.201222243.

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Liang, Chunchun, Mengwei Li, and Yulan Chen. "Amphiphilic Diazapyrenes with Multiple Stimuli-Responsive Properties." ACS Applied Materials & Interfaces 13, no. 17 (April 21, 2021): 20698–707. http://dx.doi.org/10.1021/acsami.1c03318.

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Klaikherd, Akamol, Chikkannagari Nagamani, and S. Thayumanavan. "Multi-Stimuli Sensitive Amphiphilic Block Copolymer Assemblies." Journal of the American Chemical Society 131, no. 13 (April 8, 2009): 4830–38. http://dx.doi.org/10.1021/ja809475a.

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Tsutsumi, Naoki, Akitaka Ito, Azumi Ishigamori, Masato Ikeda, Masayuki Izumi, and Rika Ochi. "Synthesis and Self-Assembly Properties of Bola-Amphiphilic Glycosylated Lipopeptide-Type Supramolecular Hydrogels Showing Colour Changes Along with Gel–Sol Transition." International Journal of Molecular Sciences 22, no. 4 (February 13, 2021): 1860. http://dx.doi.org/10.3390/ijms22041860.

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Supramolecular hydrogels formed by self-assembly of low-molecular-weight amphiphiles (hydrogelators) have attracted significant attention, as smart and soft materials. However, most of the observed stimuli-responsive behaviour of these supramolecular hydrogels are limited to gel–sol transitions. In this study, we present bola-amphiphilic glycosylated lipopeptide-type supramolecular hydrogelators that exhibit reversible thermochromism along with a gel–sol transition. The bola-amphiphiles have mono-, di-, tri- or tetra-phenylalanine (F) as a short peptide moiety. We investigate and discuss the effects of the number of F residues on the gelation ability and the morphology of the self-assembled nanostructures.
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Zhang, Xiao-Mei, Kun Guo, Luo-Hao Li, Sheng Zhang, and Bang-Jing Li. "Multi-stimuli-responsive magnetic assemblies as tunable releasing carriers." Journal of Materials Chemistry B 3, no. 29 (2015): 6026–31. http://dx.doi.org/10.1039/c5tb00845j.

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Phan, Hien, Vincenzo Taresco, Jacques Penelle, and Benoit Couturaud. "Polymerisation-induced self-assembly (PISA) as a straightforward formulation strategy for stimuli-responsive drug delivery systems and biomaterials: recent advances." Biomaterials Science 9, no. 1 (2021): 38–50. http://dx.doi.org/10.1039/d0bm01406k.

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Stimuli-responsive amphiphilic block copolymers obtained by PISA have emerged as promising nanocarriers for enhancing site-specific and on-demand drug release in response to a range of stimuli such as pH, redox agents, light or temperature.
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Lee, Myongsoo, Sun-Ja Lee, and Li-Hong Jiang. "Stimuli-Responsive Supramolecular Nanocapsules from Amphiphilic Calixarene Assembly." Journal of the American Chemical Society 126, no. 40 (October 2004): 12724–25. http://dx.doi.org/10.1021/ja045918v.

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Dissertations / Theses on the topic "Amphiphilic Stimuli"

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Chen, Chao. "Amphiphilic dendrimers for siRNA delivery." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4738.

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Le défi majeur de la thérapie génique à base de siARN est sa délivrance sûre et efficace. Récemment, notre groupe a mis au point des dendrimères amphiphiles comme vecteurs robustes et efficaces de délivrance non-virale de siARN, qui combinent les avantages de délivrance des vecteurs lipidiques et polymèriques. J’ai effectué au cours de ma thèse de doctorat une analyse de la relation structure/activité (SAR) d'une série de dendrimères comportant des queues hydrophobes de différentes longueurs. Nos résultats démontrent qu’un équilibre optimal entre la longueur de la chaîne alkyle hydrophobe et la partie hydrophile dendritique joue un rôle crucial sur leur capacité d’auto-assemblage, ainsi que sur leur activité de transport des siRNA. En outre, en combinant bola-amphiphiles et nos dendrimères amphiphiles, nous avons développé un nouveau dendrimère bola-amphiphile dont nous avons étudié les propriétés d’auto-assemblage et l'efficacité de transport du siARN correspondant. Ce dendrimère bola-amphiphile particulier a été en mesure de réagir à des espèces réactives de l'oxygène pour la délivrance spécifique, ouvrant ainsi de nouvelles perspectives pour la conception de vecteurs stimuli-déclencheurs pour siARN ciblés. Enfin, nous avons étudié l’«effet d'éponge à protons» des vecteurs dendritiques amphiphiles à l'aide de la technique du film Langmuir en monocouche. Nos résultats ont prouvé le gonflement des vecteurs dendritiques amphiphiles par protonation, offrant ainsi des données expérimentales permettant de soutenir sans ambiguïté l’hypothèse de l'«effet d'éponge à protons»
A key challenge in RNAi-based gene therapy is the safe and effective siRNA delivery. Recently, our group has established amphiphilic dendrimers as robust and effective nonviral delivery vectors for siRNA, which combine the beneficial delivery features of both lipid and dendritic polymer vectors while overcoming their shortcomings.With the desire to understand the underlying mechanism of amphiphilic dendrimers for efficient delivery, I performed a structure/activity relationship (SAR) analysis of a series of dendrimers featuring hydrophobic tails of different lengths during my PhD thesis. We systematically investigated these dendrimers for their self-assembling characters and their capacities for both binding and delivery of siRNA. Our results demonstrate that an optimal balance between the hydrophobic alkyl chain length and the hydrophilic dendritic portion plays a crucial role in the self-assembly and the delivery activity towards siRNA.Furthermore, we developed a novel bola-amphiphilic dendrimer by combining bola-amphiphiles and our amphiphilic dendrimers and studied their self-assembly properties and the corresponding siRNA delivery efficiency. This peculiar bola-amphiphilic vector was able to respond to reactive oxygen species for specific delivery, opening a new perspective for the design of stimuli-trigged vectors for targeted siRNA delivery.Finally, I studied the “proton sponge effect” of the amphiphilic dendrimer vectors using the Langmuir monolayer film technique. Our results gave direct evidence of swelling of the amphiphilic dendrimers upon protonation, offering unambiguous experimental data to support the “proton sponge effect”
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Sharma, Arjun. "Molecular Dynamics Simulations of Stimuli-Responsive Polymers." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2275.

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Polymers that undergo dramatic changes in structural conformations in response to numerous stimuli such as temperature, pH, electric and magnetic fields, light inten- sity, biological molecules, and solvent polarity, are known as stimuli-responsive or ”smart” polymers. There is a broad range of very promising applications of these materials in catalysis, environmental remediation, sensors or actuator systems, and as delivery systems of therapeutic agents. Researchers have been trying to mimic smart polymers based on properties of polymers found in nature such as proteins, carbohydrates and nucleic acids. Novel bio-compatible polymers with a variety of chemical functional groups, diverse topologies, and cross-linking patterns with the ability to self-assemble in vivo are being engineered. Experimental and theoretical studies indicate that the thermodynamic properties relating to the hydrophobic effects play a pivotal role in determining the self-assembly process in smart polymers. At the same time, computational approaches based on simulation and modeling provide an understanding of this phenomenon on the micro- scopic level. Building empirical models based on statistical mechanics methods and simulation data helps to design polymeric materials with desirable traits. My research is mainly focused on investigating physicochemical characteristics of stimuli-responsive polymers under different conditions. I used atomistic molecular dynamics simulations to investigate these effects on polymer conformation. Given the size and complexity of our polymeric systems, we employed Graphical Process- ing Units (GPU) and enhanced sampling techniques such as REDS2 to increase the sampling time. These methods allow for the study of polymeric structural dynamics in solvents of varying polarity and in human skin epidermis. Our constant pH simulation of poly(methacrylic acid) revealed that the overall response is made up of local and global structural changes. The local structural re- sponse depends on the tacticity of the polymer, which leads to distinct cooperative effects for polymers with varying stereochemistry. Such simulations help to under- stand the principal driving forces behind the mechanism of self-assembly processes.
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Collins, Samantha Caitlin. "Stimuli-responsive self-assembling materials comprising amphiphilic copolymers for localized remotely triggered therapeutic delivery." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/109669.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemical Engineering, February 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references.
The ability to introduce therapeutic at a specified location and time to a healing traumatic wound deep within the body by external non-invasive stimulus could provide great long-term benefit to patients. In this work, we have examined systems consisting of or including amphiphilic copolymers towards deep-tissue externally triggered localized therapeutic delivery applications. First, we probed a polyelectrolyte multilayer incorporating poly(L-glutamic acidtriethylene glycol-diclofenac) copolymer micellar aggregates for near-infrared responsive enhanced therapeutic delivery. It was discovered that the films released small-molecule non-steroidal anti-inflammatory drug diclofenac up to five-fold faster during remote irradiation with near-infrared. The near-infrared source was effective at generating more-rapid release from films with tissue mimic penetration depths of at least twelve centimeters. Irradiations in immediate succession produced diminishing rates of release. The highly near-infrared responsive behavior was attributed to a delayed-elution mechanism. In this mechanism, the diclofenac was first hydrolytically cleaved from unimers in the film and then resided within the hydrophobic cores of micellar aggregates until freed by energy imparted by the near-infrared irradiation. Gold nanorods were incorporated into the films to enhance the response of the films to near infrared above controls. Due to non-covalent suspension of the nanorods, aggregation led to a kinetically dependent enhancement of performance. Next, we improved the synthesis of a copolymer of 2-(dimethylamino)ethyl methacrylate with a spiropyran methacrylate by atom transfer radical polymerization for increased kinetic control. From there, we optimized the composition of this multiresponsive copolymer such that isomerization of the spiropyran moiety brought about a solubility transition surrounding 37°C. This property of the copolymer was designed such that the solubility shift by remote photo-trigger would bring about therapeutic release in a polymer multilayer system analogous to the diclofenac system. Overall, this work demonstrates the utility of engineering amphiphilic copolymers as a powerful approach to impart remotely triggerable therapeutic release properties for use with implants deeply located within the body.
by Samantha Caitlin Collins.
Ph. D.
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Wallace, Ashley J. "pH-triggered Self-Assembly of a PEGylated Peptide Amphiphilic Contrast Agent." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500485484867638.

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Viswanathan, Kalpana. "Synthesis and Characterization of Novel Polymers for Functional and Stimuli Responsive Silicon Surfaces." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27052.

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The synthesis of a variety of novel functionalized polymers using living polymerization techniques to achieve functional and stimuli responsive coatings on silica surfaces are described. Since microscopic features on a surface influence the overall wetting properties of the surface, a systematic investigation of the influence of polymer architecture on the microscopic characteristics of the modified surfaces was studied using silane-functionalized linear and novel star-branched polystyrene (PS). Star-branched modifiers provide functional and relatively well-defined model systems for probing surface properties compared to ill-defined highly branched systems and synthetically challenging dendrimers. Using these simple star-shaped macromolecules it was shown that the topographies of the polymer-modified surfaces were indeed influenced by the polymer architecture. A model explaining the observed surface features was proposed. A living polymerization strategy was also used to synthesize centrally functionalized amphiphilic triblock copolymers. The amphiphilic copolymers exhibited stimuli responsive changes in surface hydrophobicity. In spite of multiple solvent exposures, the copolymer films remained stable on the surface indicating that the observed changes in surface properties were due to selective solvent induced reversible rearrangement of the copolymer blocks. The chemical composition of the copolymers was tailored in order to tune the response time of the surface anchored polymer chains. Thus, the polymer coatings were used to reversibly change the surface polarities in an on-demand fashion and could find possible applications as smart adhesives, sensors and reusable membrane devices. In contrast to the afore-mentioned covalent modification approach, which often leads to permanent modification of surfaces, renewable surfaces exhibiting â universalâ adhesion properties were also obtained through non-covalent modification. By employing hydrogen bonding interactions between DNA bases, surfaces functionalized with adenine groups were found to reversibly associate with thymine-functionalized polymers. This study describing the solvato-reversible polymer coating was the first demonstration on silica surfaces. A systematic investigation of the influence of surface concentration of the multiple hydrogen bonding groups and their structure on the extent of polymer recognition by the modified surfaces is also discussed.
Ph. D.
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Lespes, Aurélie. "Synthèse et caractérisation de copolymères diblocs amphiphiles thermo- et CO2-stimulables." Thesis, Pau, 2015. http://www.theses.fr/2015PAUU3038/document.

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L’objectif de cette thèse est d’étudier la synthèse et les propriétés d’auto-assemblage en milieu aqueux de copolymères « intelligents » capables de former des agrégats supramoléculaires en réponse à deux stimuli : la température du milieu et la présence de dioxyde de carbone (CO2). Pour cela, une gamme de copolymères diblocs amphiphiles composés d’un bloc hydrophile d’acrylate de polyethylèneglycol méthyléther) (PEGA) et d’un bloc stimulable contenant une distribution statistique d’unités PEGA et acrylate de diéthlèneglycol éthyléther (DEGA) (thermosensibles) et acrylate de diéthylaminoéthyle DEAEA (CO2-sensible), a été préparée par polymérisation radicalaire contrôlée par les nitroxydes (NMP). Dans un second temps, il a été mis en évidence que la température ainsi que la présence de CO2 dans la solution influencent le comportement auto-associatif des copolymères dans l’eau. Par la suite, le bloc hydrophile a été remplacé par une séquence de dextrane, ce qui a permis de préparer de nouveaux copolymères diblocs fonctionnels, stimulables par la température et le CO2. Dans ce cas, deux techniques de polymérisation radicalaire contrôlée (NMP et ATRP) ont été testées afin d’obtenir les copolymères possédant l’architecture la mieux définie possible
This project aims to investigate the synthesis and properties of dual stimuli-responsive block copolymers able to self-assemble into supramolecular aggregates in response to two stimuli: the temperature and the presence of carbon dioxide in the aqueous solution. Therefore, a range of amphiphilic diblock copolymers composed of a hydrophilic block of polyethylene glycol methylether acrylate (PEGA) and a statistical block of PEGA, diethylene glycol ethyl ether acrylate (DEGA) and diethylaminoethyl acrylate (DEAEA) was prepared via nitroxide-mediated polymerization (NMP) and the level of control of each synthesis was studied. We evidenced that temperature and CO2 play a different role in the self-assembly of such block copolymers. Finally, the introduction of dextrane as hydrophilic block coming from renewable resources allows for the preparation of novel “smart” amphiphilic diblock copolymers. In order to synthesize these block copolymers with well-defined structure, both NMP and atom transfer radical polymerization (ATRP) were investigated in parallel
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Pottier, Christophe. "Copolymères triblocs stimuli-sensibles à amphiphilie contrôlée : synthèse et auto-assemblage en solution aqueuse." Rouen, 2015. http://www.theses.fr/2015ROUES013.

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Au cours de cette étude, nous avons élaboré et caractérisé des copolymères triblocs multisensibles composés de blocs externes de taille et d’amphiphilie contrôlées à base de pullulane ou de poly(acide acrylique) (PAA). Ces copolymères sont constitués d’un bloc central fixe à base de poly(oxyde de propylène) (PPO) thermosensible de type LCST, la Jeffamine® D2000. La taille du pullulane a été réduite par hydrolyse acide (pH 2) à 80°C. Le pullulane a ensuite été couplé à la D2000 par amination réductrice pour former des copolymères triblocs pullulane-b-D2000-b-pullulane. La faible réactivité de cette réaction et la perte du copolymère lors de la purification ne nous ont cependant pas permis d’étudier son comportement en solution aqueuse. Les polymères à extrémités PAA ont été obtenus par polymérisation radicalaire par transfert d’atome (ATRP) d’un précurseur de PAA, l’acrylate tert-butyle (tBA) et hydrolyse successive. La Jeffamine® a préalablement été modifiée en macroamorceur di-bromé de type amide. Après avoir montré le caractère contrôlé de l’ATRP, des copolymères P(tBA)-b-D2000-b-P(tBA) de faible dispersité de masses molaires (< 1,3) et de taille variée ont été synthétisés. Les blocs externes P(tBA) ont ensuite été hydrolysés totalement ou partiellement en PAA ou P(AA-stat-tBA). Les copolymères P(AA)x-b-D2000-b-P(AA)x présentent un comportement à la fois de type UCST et LCST conduisant respectivement à la formation agrégats visibles macroscopiquement et d’agrégats solubles. Ces comportements UCST et LCST peuvent être contrôlés par le degré d’ionisation et par la taille des blocs PAA. Par ailleurs, les agrégats solubles sont caractérisés par un très faible nombre d’agrégation (entre 1 et 3), qui est principalement dû à la structure triblocs du copolymère. L’augmentation de l’hydrophobie des blocs P(AA-stat-tBA) a mis en évidence la formation de structures solubles fortement agrégées dont la taille augmente avec le rapport tBA/AA. Cependant, l’apport d’hydrophobie a entrainé la perte du comportement LCST
In this study, we developed and characterized multi-sensitive triblock copolymers composed of outer blocks with controlled length and amphiphilicity based on pullulan or poly(acrylic acid) (PAA). These copolymers are composed of a fixed middle block based on a LCST thermosensitive poly(propylene oxide) (PPO), the Jeffamine® D2000. Pullulan size was reduced by acid hydrolysis (pH 2) at 80 °C. Pullulan was then coupled to the D2000 by reductive amination to form pullulan-b-D2000-b-pullulan triblock copolymers. The low reactivity of this reaction and the loss of copolymer during purification did not allow to study its behavior in aqueous solution. PAA-terminated polymers were obtained by atom transfer radical polymerization (ATRP) of a precursor of PAA, tert-butyl acrylate (tBA), and subsequent hydrolysis. Jeffamine® was previously converted in an amide-type di-brominated macroinitiator. After proving the controlled character of the ATRP, P(tBA)-b-D2000-b-P(tBA) triblock copolymers with low dispersity (<1,3) and various size were synthesized. P(tBA) outer blocks were then completely or partially hydrolyzed in PAA or P(AAstat-tBA). P(AA)x-b-D2000-b-P(AA)x copolymers both exhibit LCST and UCST behavior, leading respectively to the formation of macroscopically visible aggregates and soluble aggregates. These UCST and LCST behavior can be controlled by the degree of ionization and the size of PAA blocks. Furthermore, the soluble aggregates are characterized by a very low aggregation number (between 1 and 3), which is mainly due to the triblock structure of the copolymer. Increasing the hydrophobicity of the P(AA-stat-tBA) blocks highlights the formation of highly aggregated soluble structures having a size which increases with higher tBA/AA ratio. However, the addition of hydrophobicity resulted in the loss of LCST behavior
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Baillet, Julie. "Gels supramoléculaires stimulables à base de Glyconucléobolaamphiphiles." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0399.

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Les gels sensibles à un stimulus externe, également appelés matériaux intelligents, sont capables de détecter les changements environnementaux et de modifier en conséquence leur comportement, à la fois spatialement et temporellement. Cette propriété unique en fait des outils polyvalents pour un grand nombre d’applications, de la biomédecine à la chimie environnementale. C’est dans ce contexte que s’inscrit ce mémoire de Thèse consacré à la conception et à l’étude des propriétés physico-chimiques de systèmes stimulables originaux par modification chimique de molécules gélatrices de faible poids moléculaire (les GlycoNucléoBolaAmphiphiles ou GNBAs). Trois types de sensibilité ont été étudiées : la lumière, les enzymes et le pH. Dans une première partie, des GNBAs photostimulables porteurs d’une unité stilbène ont été synthétisés par une réaction de métathèse stéréosélective. Les isomères trans ont conduit à la formation de gels forts et thixotropes dans divers mélanges hydroalcooliques qui, sous irradiation UV, se photo-isomérisent en dérivés cis entraînant la destruction du réseau tridimensionnel.La réversibilité de ce phénomène n’est cependant que partielle en raison de la stabilité thermodynamique de l’isomère cis et de la formation de sous-produits. Dans une deuxième partie, des GNBAs hydrophiles porteurs d’un groupe lactose ont été soumis à l’action de la ß-galactosidase. En fonction de leur structure chimique, différentes cinétiques de gélification ont été observées après clivage enzymatique, mettant en lumière l’impact du milieu sur le processus d’auto-assemblage. De la même façon, des GNBAs porteurs de fonctions ester d’acides gras ont été étudiés en présence d’estérases. Enfin, dans une troisième partie,des GNBAs porteurs de fonctions orthoester ont été soumis à différentes variations de pH acides, retrouvées notamment in vivo. Suite à l’acidification, la formation de systèmes très visqueux a été observée grâce à un clivage partiel évalué à 50 %. L’hydrolyse des GNBAs esters précédemment décrits à des variations acide ou basique a également été étudiée pour évaluer leur double sensibilité
Stimuli responsive gels, also known as smart materials, have emerged as powerful platforms thanks to their unique property to sense their surroundings and to change their macroscopic behavior in time and space for a wide range of applications from biomedicine to environmental chemistry. In this context, this dissertation is devoted to the design and the study of physico-chemical properties of novel responsive systems by chemical modifications of low molecular weight gelators(GlycoNucleoBolaAmphiphiles or GNBAs) sensitive to specific triggers: light, enzymes and pH. First, light sensitive GNBAs featuring a photoresponsive stilbene unit have been synthetized using a stereoselective metathesis reaction. The trans isomers exhibited strong and thixotropic gels inwater/ethanol mixtures. Photo-isomerization under UV-light led to the formation of the bended cis derivatives resulting in the 3D network destruction. The reversibility of this phenomenon was however partly limited owing to the cis isomer thermodynamic stability and the formation of by-product. Next, hydrophilic GNBAs displaying lactose moieties sensitive to ß-galactosidase have been synthetized. According to their structure, different gelation kinetics observed after cleavage highlighted that gelation ability was impacted in complex media. Similarly, ester-linked fatty acids GNBAs sensitive to esterase have been designed to expand the scope of the enzyme responsive set of gelators. Finally, pH-sensitive GNBAs containing an orthoester moiety were synthesized. Subjected to different pH values found in vivo they showed around 50 % of cleavage and the slow formation of high viscous material. Previously described ester based GNBAs have also been investigated in acidic or basic pH
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El, Asmar Arlette. "Synthèse et caractérisation de systèmes micellaires stimuli-sensibles à partir d’huile de lin." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMIR19/document.

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L'intérêt des copolymères amphiphiles se retrouve dans de multiples applications telles que le: supports catalytique, la bio-séparation ou encore la vectorisation de principe actif. L'étude de leu auto-association sous forme micellaire est très étendue notamment via l'utilisation de polymère: intelligents. Cette classe de polymères présente un changement de comportement lors d'un modification de son environnement. Ainsi des polymères pH et thermo-sensibles ont été sélectionnés dans le but d'étudier des systèmes micellaires composés d'un cœur hydrophobe issus de l'huile de lin et d'une couronne hydrophile stimuli-sensible. Cependant, pour chaque application visée, la synthèse de macromolécules de composition et/ou d'architecture complexe possédant de nouvelles propriétés est nécessaire. Afin de contourner les limitations de cette approche, uni alternative reposant sur le mélange physique de copolymères a été étudiée dans le but de moduler les propriétés et combiner deux sensibilités
Amphiphilic copolymers have attracted a large interest as they find numerous applications in catalyst support, bio-separation devices and drug delivery systems. Their auto-association in aqueous media forming micelles are well-studied, particularly by the use of smart polymers which display a significant physicochemical change in response to modification of their environment. In this work, pH and temperature responsive polymers have been studied for the elaboration of micellar systems composed of a hydrophobic core from linseed oil and hydrophilic stimuli-sensitive coronna. However the common approach is to design one specific macromolecule for one given application, with sometimes complex composition and/or architecture. We aim to investigate a straight-forward pathway towards micellar systems with finely tuned sensitivities by the cooperative self-assembly of two different copolymers to manipulate the physico-chemical behavior of the final mixed system
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Schöttner, Sebastian [Verfasser], Markus [Akademischer Betreuer] Gallei, Markus [Akademischer Betreuer] Biesalski, Stefan [Akademischer Betreuer] Immel, and Gerd [Akademischer Betreuer] Buntkowsky. "Synthese und Funktionalisierung von amphiphilen Blockcopolymeren zur Herstellung Stimulus-responsiver und biologisch-inspirierter Membranen / Sebastian Schöttner ; Markus Gallei, Markus Biesalski, Stefan Immel, Gerd Buntkowsky." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1200099303/34.

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Books on the topic "Amphiphilic Stimuli"

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McCormick, Charles L., ed. Stimuli-Responsive Water Soluble and Amphiphilic Polymers. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.

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1946-, McCormick Charles L., ed. Stimuli-responsive water soluble and amphiphilic polymers. Washington, DC: American Chemical Society, 2000.

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3

McCormick, Charles L. Stimuli-Responsive Water Soluble and Amphiphilic Polymers. An American Chemical Society Publication, 2000.

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Book chapters on the topic "Amphiphilic Stimuli"

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Lowe, Andrew B., and Charles L. McCormick. "Stimuli Responsive Water-Soluble and Amphiphilic (Co)polymers." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 1–13. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch001.

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Hashidzume, Akihito, Tetsuya Noda, and Yotaro Morishima. "Stimuli-Responsive Associative Behavior of Polyelectrolyte-Bound Nonionic Surfactant Moieties in Aqueous Media." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 14–37. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch002.

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Smith, Geoffrey L., and Charles L. McCormick. "Micellar Polymerization for the Design of Responsive Amphiphilic Polymers." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 38–57. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch003.

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Amiel, Catherine, Laurence Moine, Agnès Sandier, Wyn Brown, Cristelle David, Frederique Hauss, Estelle Renard, Martine Gosselet, and Bernard Sébille. "Macromolecular Assemblies Generated by Inclusion Complexes between Amphipathic Polymers and β-Cyclodextrin Polymers in Aqueous Media." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 58–81. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch004.

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Porcar, Iolanda, Philippe Sergot, and Christophe Tribet. "Evidence for Photoresponsive Cross-links in Solutions of Azobenzene Modified Amphiphilic Polymers." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 82–100. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch005.

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Thomas, David B., R. Scott Armentrout, and Charles L. McCormick. "Synthesis and Aqueous Solution Behavior of Novel pH Responsive, Zwitterionic Cyclocopolymers." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 101–14. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch006.

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Bütün, V., and S. P. Armes. "Synthesis of Novel Shell Cross-Linked Micelles with Hydrophilic Cores." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 115–39. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch007.

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Baum, Marina, Mical E. Pallack, Jude T. Rademacher, and William J. Brittain. "Controlled Polymerization of Acrylamides." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 140–47. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch008.

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Bon, Stefan A. F., Kohji Ohno, and David M. Haddleton. "Water-Soluble and Water Dispersible Polymers by Living Radical Polymerisation." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 148–61. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch009.

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Heinz, B. S., A. Laschewsky, E. D. Rekaï, E. Wischerhoff, and T. Zacher. "Grafting of Functionalized Water Soluble Polymers on Gold Surfaces." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 162–80. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch010.

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Conference papers on the topic "Amphiphilic Stimuli"

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Creasy, M. Austin, and Donald J. Leo. "Modeling Bilayer Systems as Electrical Networks." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3791.

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Bilayers are synthetically made cell membranes that are used to study cell membrane properties or make functional devices that use the properties of the cell membrane components. Lipids and proteins are two of the main components of a cell membrane. Lipids are amphiphilic molecules that can self assemble into organized structures in the presences of water and this self assembly property can be used to form bilayers. Because of the amphiphilic nature of the lipids, a bilayer is impermeable to ion flow. Proteins are the active structures of a cell membrane that opens pores through the membrane for ions and other molecules to pass. Proteins are made from amino acids and have varying properties that depend on its configuration. Some proteins are activated by reactions (chemical, thermal, etc) or gradients induced across the bilayer. One way of testing bilayers to find bilayer properties is to induce a potential gradient across a membrane that induces ion flow and this flow can be measured as an electrical current. But, these pores may be voltage gated or activated by some other stimuli and therefore cannot be modeled as a linear conductor. Usually the conductance of the protein is a nonlinear function of the input that activates the protein. A small system that consists of a single bilayer and protein with few changing components can be easily modeled, but as systems become larger with multiple bilayers, multiple variables, and multiple proteins, the models will become more complex. This paper looks at how to model a system of multiple bilayers and the peptide alamethicin. An analytical expression for this peptide is used to match experimental data and a short study on the sensitivity of the variables is performed.
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Baccile, Niki, Alexandre Poirier, and Chloe Seyrig. "Biosurfactants and biopolymers: Between interactions, orthogonality and mutual responsivity." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/taly8346.

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Polymer-surfactant systems have many applications in everyday life, but their petrochemical origin is not only controversial but soon submitted to regulatory restrictions. In a more environmentally friendly approach, but also to forecast regulations in both EU and USA, biopolymer-biosurfactant systems are an interesting alternative. There exists a large family of both biobased surfactants and polymers, which possess a huge potential, however currently limited, because both the solution behaviour of the former and their interactions are not established, yet. [1] This presentation shows the first set of work where biosurfactants (sophorolipids, glucolipids) are studied together with biopolymers (chitosan, alginate, gelatin, collagen, silk fibroin) (Figure 1). The results are astonishing, as they depend on the biosurfactant's self-assembled state, but also its charge and the charge of the biopolymer. Complex coacervates are often formed at basic pH when biosurfactants are within their micellar state and charges are opposite. [2] At acidic pH, orthogonality seems to prevail when the biosurfactant reorganizes into crystalline fibers, [3] but new phases, derived from mutual electrostatic interactions, can also appear, when the biosurfactants forms a vesicular phase. [4] These data are important to design biosurfactant-biopolymer-based nanocarriers or stimuli-responsive hydrogels. [1] Baccile N, Seyrig C, et al. Self-assembly, interfacial properties, interactions with macromolecules and molecular modelling and simulation of microbial bio-based amphiphiles (biosurfactants). A tutorial review. Green Chem. 2021, 3842[2] G. Ben Messaoud, Baccile N, et al. Complex coacervation of natural sophorolipid bolaamphiphile micelles with cationic polyelectrolytes. Green Chem. 2018, 3371[3] Seyrig C, Kignelman G, Thielemans W, Griel P Le, Cowieson N, Perez J, Baccile N et al. Stimuli-induced non-equilibrium phase transitions in polyelectrolyte-surfactant complex coacervates. Langmuir. 2020, 8839[4] Seyrig C, Baccile N et al. Synthesis of multilamellar walls vesicles polyelectrolyte-surfactant complexes from pH-stimulated phase transition using microbial biosurfactants. J Colloid Interface Sci. 2020, 493
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Reports on the topic "Amphiphilic Stimuli"

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Thayumanavan, Sankaran. Stimuli Responsive Amphiphilic Assemblies. Fort Belvoir, VA: Defense Technical Information Center, November 2013. http://dx.doi.org/10.21236/ada607170.

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