Showing papers in "Molecular Crystals and Liquid Crystals in 2010"
TL;DR: In this article, the authors define a continuum energy functional that interpolates between the mean-field Maier-Saupe energy and the continuum Landau-de Gennes energy functional and can describe both spatially homogeneous and inhomogeneous systems.
Abstract: We define a continuum energy functional that effectively interpolates between the mean-field Maier-Saupe energy and the continuum Landau-de Gennes energy functional and can describe both spatially homogeneous and inhomogeneous systems. In the mean-field approach the main macroscopic variable, the Q-tensor order parameter, is defined in terms of the second moment of a probability distribution function. This definition imposes certain constraints on the eigenvalues of the Q-tensor order parameter, which may be interpreted as physical constraints. We define a thermotropic bulk potential which blows up whenever the eigenvalues of the Q-tensor order parameter approach physically unrealistic values. As a consequence, the minimizers of this continuum energy functional have physically realistic order parameters in all temperature regimes. We study the asymptotics of this bulk potential and show that this model also predicts a first-order nematic-isotropic phase transition, whilst respecting the physical constrain...
211 citations
TL;DR: In this paper, two new series of azoSchiff base and azo-ester liquid crystals having the following structures have been synthesized, and all the compounds possess mesomorphic properties.
Abstract: In order to investigate the influence of the terminal substitution on mesomorphism, two new series of azo-Schiff base and azo-ester liquid crystals having the following structures have been synthesized. All the compounds possess mesomorphic properties. In series A compounds A1 and A3 exhibit only a nematic mesophase, whereas compounds A2, A4, A5, A6, A7, A8, A9, and A10 exhibit a smectic as well as a nematic phase. In series B compounds B1 to B9 exhibit only a nematic mesophase, and compounds B10 and B11 exhibit a smectic as well as a nematic phase, but compound B12 exhibits only a smectic phase. All these compounds were characterized by elemental analyses and spectroscopic techniques (Fourier transform infrared [FTIR], 1H nuclear magnetic resonance [NMR], and mass spectroscopy). Their mesomorphic properties were measured by optical polarized light microscopy and differential scanning calorimetry (DSC).
60 citations
TL;DR: In this article, curaua fibres were utilized for isolation of nanofibres and Polyvinyl Alcohol (PVA) was chosen as the matrix due to its excellent film forming, packaging capacity and its hydrophilic nature, which enhances the interfacial compatibility between the natural fibre and the matrix.
Abstract: Cellulose nanofibres are environmentally benign and have unique features compared to macro scales. Nowadays, many efforts have been made in developing potential composite products with improved properties. However, the manufacturing of nanocomposites with natural fibres has been a challenging task due to the difficulty encountered in order to aggregate the nanofibres. In this paper, curaua fibres were utilized for isolation of nanofibres. Polyvinylalcohol (PVA) was chosen as the matrix due to its excellent film forming, packaging capacity and its hydrophilic nature, which enhances the interfacial compatibility between the natural fibre and the matrix. The composite is prepared by solution casting technique.
44 citations
TL;DR: In this paper, the authors investigated the device physics and electro-optical properties of emerging liquid crystal displays (LCDs) based on the Kerr effect and developed a numerical model to understand the underlying device physics in order to optimize device performance.
Abstract: The device physics and electro-optical properties of emerging liquid crystal displays (LCDs) based on the Kerr effect are investigated. With a voltage applied, both blue phase and polymer-stabilized blue phase exhibit a fascinating isotropic-to-anisotropic transition. We have developed a numerical model to understand the underlying device physics in order to optimize device performance. The operating voltage is found to be inversely proportional to the square-root of Kerr constant of the LC composite. To reduce operation voltage while keeping high transmittance and fast response time, device structures with strong and deep horizontal electric fields, and LC materials with a large Kerr constant play equally important roles.
39 citations
TL;DR: In this article, a mixture with the helical pitch longer than the typical cell gap was formulated and the physical and structural properties of mixture were presented and their parameters were discussed and the electrooptical performance was presented and discussed.
Abstract: Orthoconic Antiferroelectric Liq. Cryst. (OAFLC) have been extensively studied due to their unique electrooptical properties [1,2]. Practical implementation of this kind of liquid crystalline medium experiences many obstacles including a number of parasitic effects deteriorating the electrooptical performance. In search for working OAFLC a mixture with the helical pitch longer than the typical cell gap was formulated. Using this mixture near perfect optical uniformity and excellent dark state at the zero electric field applied was obtained. The physical and structural properties of mixture are presented and their parameters are discussed. The electrooptical performance is presented and discussed.
38 citations
TL;DR: In this article, multiwalled carbon nanotubes (MWCNTs) were embedded in electrospun bacterial cellulose (BC) nanofibers, which were prepared using an electrospinning method.
Abstract: Multiwalled carbon nanotubes (MWCNTs) were embedded in electrospun bacterial cellulose (BC) nanofibers, which were prepared using an electrospinning method. In this study, Gluconacetobacter xylinum BRC5 was employed to produce a hydrogel-like bacterial cellulose (BC) sheet. BC was difficult to process in the solution stat because of the large concentration of intra- or inter-molecular hydrogen bonds. In this study, an ionic liquid, 1-allyl-3-methyl-imidazolium chloride, was used to dissolve BC. To form BC nanofibers, 5 wt% BC solutions both with and without MWCNTs were electrospun. Scanning electron microscopy and transmission electron microscopy showed that the MWCNTs were embedded and well aligned along the fiber axis. The crystalline polymorph transformed from cellulose I (pristine BC) to cellulose II (electrospun regenerated BC fibers). Moreover, the tensile strength and modulus of the MWCNT-embedded electrospun BC nanofibers increased by approximately 290% and 280%, respectively. Additionally, the th...
36 citations
TL;DR: In this paper, the authors used FT-IR spectra to investigate the effect of doxycycline and tannic acid on the triple helical structure of collagen and found that the degree of crosslinking increases with the amount of acid.
Abstract: Collagen-doxycycline matrices crosslinked with a natural polyphenol – tannic acid for the treatment of infected wounds were obtained by the freeze-drying of the corresponding gels. FT-IR spectra show that the triple helical structure of collagen is preserved in all the matrices, doxycycline produce collagen crosslinking and the degree of crosslinking increases with tannic acid concentration. Digestion of matrices using collagenase confirms the crosslinking effect of doxycycline and tannic acid and the increasing of the crosslinking degree with the amount of acid. The release of doxycycline from the matrices crosslinked with tannic acid is slower than that from the uncrossliked one and decreases with increasing of acid concentration, according to FT-IR and digestion results, and follows the power law model, with a release exponent of about 0.4, which indicates an anomalous transport. The matrices containing doxycycline, tannic acid and their combination do not develop gram-positive (Staphylococcus aureus) ...
36 citations
TL;DR: In this article, a series of double hydrogen bonded liquid crystals have been isolated and a field-induced transition (FiT) was observed in SA-+-9BA hydrogen bonded complex.
Abstract: A novel series of double hydrogen bonded liquid crystals have been isolated. Hydrogen bond was formed between non mesogen ingredient succinic acid and mesogenic p-n alkoxy benzoic acids. Phase diagram was constructed from the transition temperatures obtained by differential scanning colorimetry (DSC) and polarizing optical microscopic (POM) studies. Thermal and electrical properties exhibited by succinic acid and nonyloxy benzoic acid (SA + 9BA) were discussed. Interesting feature of the present investigation was the observation of a field-induced transition (FiT) in SA + 9BA hydrogen bonded complex. Three threshold field values are noticed which gives rise to two new phases (E1 and E2) induced by external bias voltage and on further enhancement of the bias voltage the mesogen behaves like an optical shutter, thus this hydrogen bonded complex mesogen acts as an effective light modulator. It was noticed that FiT was reversible, in the sense that when applied filed was removed, the original texture was rest...
35 citations
TL;DR: A linear hydrogen-bonded homologous liquid crystal series has been isolated with chiral ingredient as levo tartaric acid possessing two chiral carbons and non chiral mesogen as p-nalkoxy benzoic acids.
Abstract: A linear hydrogen bonded homologous liquid crystal series has been isolated with chiral ingredient as levo tartaric acid possessing two chiral carbons and non chiral mesogen as p-n-alkoxy benzoic acids. In the synthesized hydrogen bonded complexes the p-n-alkoxy benzoic acid moiety varied from pentyloxy to dodecyloxy with an exception of butyloxy and hexyloxy benzoic acids. Textural studies have been carried out by polarizing microscopic studies, (POM). Interestingly the phase sequences exhibited by odd and even complexes are strikingly different. In other words phase sequence of Nematic, smectic C*, F*, and G* is observed in the odd hydrogen bonded complexes while in addition to these phases the even counter parts exhibit a new type of phase sequence with smectic C* followed by pseudo smectic C* and reentrant smectic C* phases which are designated as Sm C*, Sm C p *, and Sm C r * phases respectively. A detailed DSC and dielectric studies confirmed the existence of the reentrant phase. We report a new pha...
33 citations
TL;DR: In this paper, the use of block copolymers prepared by controlled radical polymerization as a tool for inducing nanostructures in conducting polymers and organically-derived carbons is discussed.
Abstract: Inducing nanostructure in conducting polymers and organically-derived nanostructured carbons provides additional control over their physical and electronic properties. These nanostructures have previously been produced by lithographic methods such as e-beam lithography, ion lithography and patterning involving pre-prepared masks. Self-assembly based on block copolymer self-segregation is another method for inducing nanostructures, one that contains a great deal of flexibility in the means of structure formation. Simply incorporating conducting moieties into one segment of a block copolymer via block extension or coupling is one primary strategy. Templating the conducting material or its precursor with block copolymer micelles and membranes, particularly when one segment of the copolymer exhibits affinity with the conducting polymer, is another heavily utilized method. This review discusses the use of block copolymers prepared by controlled radical polymerization as a tool for inducing nanostructure in con...
33 citations
TL;DR: In this article, the cocrystals of a pharmaceutical model rac-ibuprofen with two pyridine-containing cocrystal formers were synthesized and their solid-state structures were carefully investigated in terms of crystal engineering and supramolecular chemistry.
Abstract: The cocrystals of a pharmaceutical model rac-ibuprofen with two pyridine-containing cocrystal formers were synthesized and their solid-state structures were carefully investigated in terms of crystal engineering and supramolecular chemistry. The target cocrystals were obtained by solvent-free grinding of rac-ibuprofen with the given cocrystal former and then suitable X-ray crystals were grown in acetonitrile solution and characterized by X-ray crystallography. Both structures adopted homo and hetero supramolecular synthons as well as other noncovalent interactions.
TL;DR: In this article, Kuczynski et al. calculated the molecular polarizabilities from the refractive indices and the density using the well-known internal field models and estimated the molecular anisotropy from the Lippincott δ-function model and molecular vibration method.
Abstract: Alkoxy benzoic acids are well-known liquid-crystalline compounds with nematic phase of long thermal ranges. The refractive indices measurements are carried out using a wedge-shaped cell with the help of a modified spectrometer. The birefringence (δn = ne − no) is obtained directly by using the method developed by Kuczynski et al. [10] in all the available compounds (alkoxy chain number n = 3 to 12 and 16). The higher homologues exhibit the smectic-C phase along the nematic phase. The molecular polarizabilities are calculated from the refractive indices and the density using the well-known internal field models. The molecular anisotropy is estimated from the Lippincott δ-function model and molecular vibration method. The order parameter, S, is estimated (a) using molecular polarizabilities and the molecular anisotropy for both the models, (b) from Haller's extrapolation using molecular polarizabilities, and (c) directly from the birefringence, a method developed by Kuczynski et al. [10] along with the nema...
TL;DR: In this paper, two compounds based on the ethyl cellulose having azobenzene side chain mesogenic units were prepared and the structures of the cellulosic liquid crystals were confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectra.
Abstract: Two compounds based on the ethyl cellulose having azobenzene side chain mesogenic units were prepared and the structures of the cellulosic liquid crystals were confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectra. Liquid-crystalline properties were characterized by differential scanning calorimetry and polarizing optical microscopy in which compound 4a shows a columnar phase and compound 4b shows a semectic A phase. The absorption spectra of the azobenzene units display a high-intensity π–π* transition at about 364 and 366 nm for compounds 4a and 4b, respectively, and a lower intensity n–π* transition at around 468 nm for both compounds. Hence, photochromism can be achieved by the introduction of the azo linkage to ethyl cellulose containing liquid crystals.
TL;DR: In this paper, a homologous series of inter-hydrogen-bonded complexes between p-n-alkoxybenzoic acids (12A+nBA) and alkyl aniline was isolated.
Abstract: A homologous series of inter-hydrogen-bonded complexes between p-n-alkoxybenzoic acids (12A + nBA) and alkyl aniline was isolated. The mesogenic p-n-alkoxybenzoic acids formed a hydrogen bond with liquid-crystal intermediate 4-dodecyl aniline. The isolated homologous series compounds were analyzed by Fourier transform infrared (FTIR), polarizing optical microscope, dielectric studies, and differential scanning calorimetry (DSC). An interesting feature of these homologous series was the occurrence of an ambient smectic ordering in some of the isolated mesogens. The phase diagrams of the p-n-alkoxybenzoic acids and the present homologous series were computed and compared. The hydrogen bond formation was evinced through FTIR spectral studies. Two higher member mesogens of the present homologous series were found to exhibit monotropic smectic G phase. Results of free p-n-alkoxybenzoic acids and the hydrogen-bonded homologous series are discussed in the light of increment alkoxy carbon number, mesogenic phases...
TL;DR: A comprehensive review of biodegradable poly(3-hydroxybutyrate) research can be found in this paper, including fundamental structure/property relationships and biodegradation kinetics.
Abstract: This review is designed to be a comprehensive source for biodegradable polymer: poly(3-hydroxybutyrate) research, including fundamental structure/property relationships and biodegradation kinetics for samples of different geometry. In addition to presenting the scientific framework for the advances in PHB research, this review focuses on applications of PHB in biomedicine and environment with a discussion on commercial applications and health/safety concerns for biodegradable materials.
TL;DR: Leaf fibers are fibers that run lengthwise through the leaves of most monocotyledonous plants such as pineapple, banana, etc as mentioned in this paper, and are emerging fiber having a very large potential to be used for composite materials.
Abstract: Leaf fibers are fibers that run lengthwise through the leaves of most monocotyledonous plants such as pineapple, banana, etc. Pineapple (Ananas comosus) and Banana (Musa indica) are emerging fiber having a very large potential to be used for composite materials. Over 150,000 ha of pineapple and over 100,000 ha of banana plantations are available in Brazil for the fruit production and enormous amount of agricultural waste is produced. This residual waste represents one of the single largest sources of cellulose fibers available at almost no cost. The potential consumers for this fiber are pulp and paper, chemical feedstock, textiles and composites for the automotive, furniture and civil construction industry.
TL;DR: The research work could be concluded as successefully production of lipid nanoparticles loaded with UV-A and UV-B absorbers that may represent useful UV-blocking systems in sunscreen products for cosmetical purpose.
Abstract: The aim of this investigation was to obtain lipid nanoparticles loaded with different sunscreen agents in order to achieve enhanced photoprotection and to decrease the amount of UV – absorbers, with preserving at the same time a high sun protection factor. The developed formulations combined different types of additives including a mixture of non-ionic surfactant and lechitine with two lipids as solid matrix to obtain favourable stable lipid formulations. The research work could be concluded as successefully production of lipid nanoparticles loaded with UV-A and UV-B absorbers (with average size less than 100 nm) that may represent useful UV-blocking systems in sunscreen products for cosmetical purpose.
TL;DR: In this article, three new homologous series of liquid crystals with terminal fluoro group and central linkages such as ester and azo groups were synthesized and their mesomorphic properties were studied.
Abstract: Three new homologous series of liquid crystals with terminal fluoro group and central linkages such as ester and azo groups were synthesized and their mesomorphic properties were studied All three series are similar in molecular structure with the difference in their lateral substitutions: series I has no lateral substitution, series II has a chloro group as lateral substitution, and series III has a methyl group as lateral substitution All 12 homologues of each of the series are mesogenic in nature The nematic phase of the series shows a marble texture and the smectic phase shows a Schlieren texture of the smectic C variety The mesomorphic characteristics of the series are compared with each other
TL;DR: In this paper, the size, size distribution and shape of ferroelectric BaTiO3 nanoparticles were determined using three different imaging techniques and it was shown that the largest particles lead to the strongest enhancement of dielectric and optical anisotropy.
Abstract: The size, size distribution and shape of ferroelectric BaTiO3 nanoparticles were determined using three different imaging techniques The nanoparticles fabricated by milling microcrystals were found to have sizes of 12 ± 3 nm, 15 ± 3 nm and 18 ± 3 nm Liquid crystal suspensions with 1% concentration of nanoparticles were prepared and their dielectric and optical anisotropy were measured It is shown that the largest particles lead to the strongest enhancement of dielectric and optical anisotropy, as compared with undoped liquid crystals
TL;DR: In this paper, it was proved that adding canted antiferromagnetic nano-particles in liquid crystals increased their sensitivity to magnetic field while no change of the basic mesogenic properties of the matrix occurred.
Abstract: We explored how to increase liquid crystal sensitivity to external magnetic fields. Suspensions consisting of a mixture of liquid crystal and spindle type mono-dispersed hematite nano-particles at concentrations lower than 1 wt% were prepared. The Freedericksz transition threshold for the suspensions appeared to be lower than for the pure liquid crystal. It was proved that adding canted antiferromagnetic nano-particles in liquid crystals increased their sensitivity to magnetic field while no change of the basic mesogenic properties of the matrix occurred.
TL;DR: Pineapple leaf fiber (PALF) which is rich in cellulose, abundantly available, relatively inexpensive, low density, nonabrasive nature, high filling level possible, low energy consumption, high specific properties, biodegradability and has the potential for polymer reinforcement as mentioned in this paper.
Abstract: Pineapple leaf fiber (PALF) which is rich in cellulose, abundantly available, relatively inexpensive, low density, nonabrasive nature, high filling level possible, low energy consumption, high specific properties, biodegradability and has the potential for polymer reinforcement. The utilization of pineapple leaf fiber (PALF) as reinforcements in thermoplastic and thermosetting resins in micro and nano form for developing low cost and lightweight composites is an emerging field of research in polymer science and technology. In this paper we examines the industrial applicabiliy of PALF, mainly for production of composite materials and special papers, chemical feedstocks (bromelin enzyme) and fabrics.
TL;DR: In this paper, a tunable liquid crystal filter consisting of three interference filters with different cell thicknesses is presented. But the filter is not suitable for high birefringence and cannot select precisely the wavelength of outgoing light.
Abstract: This paper presents tunable liquid crystal filter consists of three interference filters (LC – cells) with different cell thicknesses These filters use nematic liquid crystal (with high birefringence) Such design allows to select precisely (using the electric field) the wavelength of outgoing light
TL;DR: In this paper, the effect of surface roughness on the optical properties of CdS thin film was investigated using RMS roughness measurements, and the correlation factor between the RMS Roughness and the difference in the diffused transmittance and the spectral Transmittance by using the integrating sphere was obtained.
Abstract: The effects of surface roughness on the optical properties of CdS thin film was investigated using RMS roughness measurements. CdS thin films for a window layer of the CdTe thin film solar cell were grown on ITO glass by a chemical bath deposition method with varying thiourea (CS(NH2)2) mole concentration. The surface roughness of the CdS thin film was measured by Atomic Force Microscopy (AFM). After obtaining the correlation factor between the RMS roughness and the difference in the diffused transmittance and the spectral transmittance by using the integrating sphere, we investigated the effect of surface morphology on the transmittance in all CdS thin films. It is obtained that the higher RMS value the specimen has, the more difference between the diffused transmittance and the spectral transmittance is measured. Moreover, the difference is evident at the long wavelength region.
TL;DR: In this article, a planarly rubbed sandwich cell was used to tune the lasing wavelength of cholesteric liquid crystals. But the tuning was performed by applying an electric field while cooling the sample from the isotropic state.
Abstract: The authors report continue tuning of the lasing wavelength in cholesteric liquid crystals (ChLCs) by an applied electrical fields. Although the pitch length and the corresponding lasing wavelength is sensible to external fields, only a discrete shift in the pitch is observed in the conventional cell configuration where the helix axis is lying the cell-normal direction, since the molecules are anchored to a single direction at the substrate interfaces. In this study, continuous wavelength tuning is achieved by laying the helix in the cell-plane direction, mitigating the effects of anchoring: this alignment is attained simply by applying an electric field while cooling the sample from the isotropic state, in a planarly rubbed sandwich cell. We also show that the tuning characteristics as that predicted based on calculations using the elastic theory.
TL;DR: In this article, a side chain polymer PMMA-DR1 in thin films by optical second harmonic generation techniques was studied and the results showed that for small chromophore concentrations the susceptibility follows linearly the density number of active chromophores, reaches a maximum, than decreases and stabilizes.
Abstract: Chemical synthesis and concentration dependence of two second order NLO tensor components: and was studied for a side chain polymer PMMA-DR1 in thin films by optical second harmonic generation techniques. The noncentrosymmetry was created by the corona poling technique. The results show that for small chromophore concentrations the susceptibility follows linearly the density number of active chromophores, reaches a maximum, than decreases and stabilizes.
TL;DR: In this article, the authors present some results obtained for two, the most abundant on the Earth, biopolymers which are DNA and collagen, which are doped with Rhodamine 590 and Disperse Red 1.
Abstract: Nowadays one observes a growing interest in studying and application of “green materials” – biomaterials. For an appropriate use of them in practical devices a good knowledge and understanding of their properties are necessary. This paper presents some results obtained for two, the most abundant on the Earth, biopolymers which are DNA and collagen. In order to make these biopolymers useful they have to be functionalized with active molecules, bringing them a researched property. The biopolymers were doped with Rhodamine 590 and Disperse Red 1. The contact angle measurements are also presented and discussed. The present studies show that the properties of these materials depend on the dyes used to render them optically responsive in visible range and on the biopolymer as well. They show that interaction with substrate is modified by the added dye, as expected. We have measured also the optical damage threshold of studied biopolymers at 1,064 nm and we found that it is about one order of magnitude higher fo...
TL;DR: In this article, an electro active quencher was used to control the redox state of a methylene bridged anthracene polymer (PMAn) and the reaction of the quenchers.
Abstract: Electrochemical fluorescence switching of electroactive fluorescent anthracene polymer films was studied using an electro active quencher. The fluorescence of a methylene anthracene polymer (PMAn) was intact under redox reaction in the absence of an electroactive quencher. Interestingly the fluorescence of a methylene bridged anthracene polymer (PMAn) film could be modulated by adjusting the redox state of the PMAn and redox reaction of the quencher. The electrochemical fluorescence switching from the PMAn film with a quencher was reversible and the cyclability was longer than 1,000 cycles with an ON/OFF ratio of 3.86 under the applied potential step of +2 V for 4 second. A multi state fluorescent switch was fabricated with a double layered two electrode cell that was consisting of the PMAn layer doped with a quencher and a solid polymer electrolyte layer (SPE).
TL;DR: In this article, four racemic compounds (R, S)-4′-(1-methylheptyloxycarbonyl)biphenyl-4-yl 4-[3-(2,2,3, 3, 4,4, 4]-prop-1-oxy]benzoates were synthesized and characterized.
Abstract: Four racemic compounds (R, S)-4′-(1-methylheptyloxycarbonyl)biphenyl-4-yl 4-[3-(2,2,3,3,4,4,4-heptafluorobutoxy)prop-1-oxy]benzoates were synthesized and characterized. Their mesomorphic properties, such as phase transitions temperatures and enthalpies were measured by polarizing optical microscope and differential scanning calorimetry. The example of mixture containing racemic components and its properties is presented.
TL;DR: In this paper, a 90-degrees twist alignment nematic liquid crystal doped with suitable dye to impart the required photonic absorption and order parameter modulation was used to achieve ultrafast all-optical shuttle operation for laser spanning the visible to near-infrared spectral region.
Abstract: Laser induced disorder is an efficient and very fast mechanism to induce changes in the birefringence of nematic liquid crystals, which in turn enable many nonlinear optical processes. Using a 90-degrees twist alignment nematic liquid crystal doped with suitable dye to impart the required photonic absorption and order parameter modulation, we have demonstrated ultrafast all-optical shuttle operation for lasers spanning the visible to near-infrared spectral region (532 nm; 488 nm; 750 nm; 1060 nm; 1550 nm). With increasing intensity, the on-time of the switch decreases from microseconds to the nanoseconds regime, in such a manner that the transmitted light energy/intensity is clamped to below the eye- or sensor-safe levels.
TL;DR: In this article, the influence of light, temperature and chemical environments on the stability of pure and functionalized collagen and DNA based thin films is discussed and compared with similar studies performed on synthetic polymers.
Abstract: In this paper recent studies showing the influence of light, temperature and chemical environments on the stability of pure and functionalized collagen and DNA based thin films are presented and discussed. The results are compared with similar studies performed on synthetic polymers.