Results 251 to 260 of about 2,076,410 (301)
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Photo-, Thermally, and pH-Responsive Microgels
Langmuir, 2006Microgels with photo-, thermally, and pH-responsive properties in aqueous suspension have been synthesized and characterized using dynamic light scattering and UV-visible spectroscopy. The new route involved first preparing poly(N-isopropylacrylamide) (PNIPAM)-allylamine copolymer microgels and a spiropyran photochrome (SP) bearing a carboxylic acid ...
Antonio, Garcia +8 more
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DNA Condensation by pH-Responsive Polycations
Biomacromolecules, 2010This work addresses the impact of pH variation on DNA-polyethylenimine (PEI) complex formation, in aqueous solution and at constant ionic strength. An initial potentiometric characterization of the acid-base behavior of PEI is carried out to measure the concentration of ionized species in the relevant systems.
Andreia F, Jorge +3 more
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Polyelectrolyte compaction by pH-responsive agents
Physical Chemistry Chemical Physics, 2009Compaction of negatively charged polyanions by polycations with different characteristics is investigated using Monte Carlo simulation in a coarse-grain model. Two different routes are tested and the results compared. In one, the polycation/polyanion charge ratio is varied by increasing the amount of polycations, keeping all the chain characteristics ...
A F, Jorge +3 more
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Electrical conductivity of pH-responsive hydrogels
Journal of Biomaterials Science, Polymer Edition, 1997The electrical conductivity of pH-responsive hydrogels based on cross-linked poly(2-hydroxyethyl methacrylate-co-dimethylaminoethyl methacrylate) copolymers has been studied as a function of pH over the range 5-10, for copolymers containing up to 20 mol% of the amine-containing comonomer.
N F, Sheppard +3 more
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pH‐Responsive Drug‐Delivery Systems
Chemistry – An Asian Journal, 2014AbstractIn many biomedical applications, drugs need to be delivered in response to the pH value in the body. In fact, it is desirable if the drugs can be administered in a controlled manner that precisely matches physiological needs at targeted sites and at predetermined release rates for predefined periods of time.
Ying-Jie, Zhu, Feng, Chen
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Doubly pH-Responsive Pickering Emulsion
Langmuir, 2008A pH-responsive Pickering emulsion has been designed on the basis of commercially available alumina-coated silica nanoparticles (Ludox CL silica particles) and potassium hydrogen phthalate (KHP). KHP was found to bind to cationic particle surfaces at pH values between 3.5 and 5.5, enabling the resulting surface-active particles to stabilize emulsions ...
Jian, Li, Harald D H, Stöver
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Selective and pH‐Responsive Macrocyclic Anionophores
ChemBioChemThe ability to selectively control ion transport across membranes is central for identifying synthetic ionophores that can potentially be used as therapeutics for diseases involving dysfunction of natural ion transporters. Herein, a family of C2‐symmetric macrocycles is presented, which is derived from serine or threonine and a disubstituted aromatic ...
Biswaranjan Baliarsingh +1 more
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pH‐Responsive Micro‐ and Nanocarrier Systems
Angewandte Chemie International Edition, 2013Release on demand: The pH gradients between extra- and intracellular regions can be utilized for the controlled release of drugs and biological cargos from delivery systems. Biocompatible carrier systems with pH-cleavable units must fulfill many other criteria as well, for example, a long blood circulation time.
Sabrina, Nowag, Rainer, Haag
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pH‐Responsive Polymers as Gene Carriers
Macromolecular Rapid Communications, 2010AbstractDespite the immense potential of non‐viral delivery system in gene therapy its application has been impaired greatly by various impediments having contrasting traits. Therefore it is an absolute necessity to develop some non‐viral vectors which are endowed with special characteristics to act differently in intracellular as well as extracellular
Park, IK +5 more
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pH-Responsive Cellulose Nanocrystal Gels and Nanocomposites
ACS Macro Letters, 2012We show that functionalization of the surface of cellulose nanocrystals (CNCs) with either carboxylic acid (CNC-CO2H) or amine (CNC-NH2) moieties renders the CNCs pH-responsive. At low pH, where the amine groups are protonated, CNC-NH2 forms aqueous dispersions in water on account of electrostatic repulsions of the ammonium moieties inhibiting ...
Way A.E. +4 more
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