• 한국응용과학기술학회지
• /
• 제28권2호
• /
• pp.240-246
• /
• 2011

UV-Curable hybrid coatings were synthesized to improve the surface properties of plastic film. Organic-inorganic coating solutions were prepared by the sol-gel method using urethane-acrylate oligomer, acrylate monomer, photo initiator and tetraethoxysilane (TEOS). Methacryloyloxypropyltrimethoxysilane(MPTMS) was used as a silane coupling agent to improve chemical interaction between inorganic phases and UV curable acrylate. In this study, the surface hardness and adhesive properties were improved with the use of inorganic component. The experimental results showed that UV-Curable hybrid films containing aliphatic urethane oligomer, hexanedioldiacrylate, trimethylolpropanetriacrylate, hydroxy dimethyl acetophenone exhibited good surface properties. Also, the optimum curing conditions were investigated.

• 대한가정학회지
• /
• 제26권3호
• /
• pp.103-108
• /
• 1988

Texture Profile Analysis (TPA) on cowpea and mung bean starch gels was performed with the Instron and the effect of the degree of compression on TPA parameters measured. Fracturability was almost independent of the degree of compression. hardness usually increased with increasing compression. Cohesiveness and chewiness decreased for mung bean starch gel as compression increases. Springiness in two starch gels increased a little from 55% to 65% compression and then decreased from 75% to 95% compression. Gumminess for mung bean starch gels decreased steeply from 55% to 75% compression, then it increased moderately up to 95% compression. Since the TPA parameters vary so widely with degree of compression, all TPA measurements should standardize the degree of compression.

• Transactions on Electrical and Electronic Materials
• /
• 제17권3호
• /
• pp.178-181
• /
• 2016

In this study a coating experiment was performed to fabricate blue light cut films, which represent a 390~430 nm cut off rate of more than 40% and a transmittance rate of more than 90%, using a roll-to-roll nano micro coating system. The study also analyzed the characteristics of the blue light cut films. Thus, the hardness, which is more than 3H, is ensured through fabricating films using a Sol-Gel process that will determine the proper hardness level. Also, the experiment shows excellent results by cutting blue light through a mixing blue light powder.

• 한국세라믹학회지
• /
• 제35권6호
• /
• pp.610-618
• /
• 1998

Alumina were added to ceria based ceramic powders upto 9.7 vol% and composite powders were sprayed by plasma spraying process in order to improve the mechanical properties such as hardness fracture tough-ness and thermal shock resistance. The ceria based coating sprayed without alumina has the typical colum-nar and lamellar structure. Alumina addition has lowered the amount of columnar and lamellar sturcture Added alumina was segreagated in the grain boundary and grain of ceria based crystal accompanied with pore. The maximum value of density and the minimum value of porosity were observed at the sprayed coating with 4.8 vol% alumina. The hardness fracture toughness and thermal shock resistance were increased with alumina addition. The improvement of mechanical properties of plasma sparyed ceria based coatings result-ed from the disapperance of the columnar and lamellar sturcture by addition of alumina.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
• /
• pp.551-552
• /
• 2007

Coating films were prepared from silane-terminated Colloidal silaca(CS) and UV-curable acrylate resin. The silane-terminated CSs were synthesized from CS and methyltrimethoxysilane(MTMS) and then treated with 3-methacryloxypropyltrimethoxysilane(MAPTMS)/3-glycidoxypropyltrimethoxysilane( GPTMS)/vinyltrimethoxysilane(VTMS) by sol-gel process, respectively. The silane-terminated CS and acrylate resin were hybridized using UV-curing system. Thin films of hybrid material were prepared using spin coater on the glass. Their hardness, contact angle and transmittance improved with the addition of silane-terminated CS.

• Journal of Industrial and Engineering Chemistry
• /
• 제68권
• /
• pp.209-219
• /
• 2018

Colloidally stable organic-inorganic (O-I) hybrid nanoparticles could be prepared using an alkoxysilanefunctionalized amphiphilic polymer (AFAP) precursor. O-I hybrid sols could maintain colloidal stability for six months even at 45% solid content and be coated onto glass as well as PET film to form transparent O-I hybrid films. The formation of O-I hybrid nanoparticles dispersed in cured coating films could be confirmed using scanning electron microscopy. The cured coating film showed 3H and 5H pencil hardness on PET and glass, respectively. Nanoindentation measurements also showed that their modulus and hardness was varied with the type of AFAP used in its preparation.

• 한국식물병리학회지
• /
• 제14권5호
• /
• pp.413-417
• /
• 1998

Magnaporthe grisea, the casual agent of rice blast, requires formation of an appressorium, a dome-shaped and well melanized infection structure, to penetrate its host. Environmental cues that induce appressorium formation include hydrophobicity and hardness of contact surface and chemicals from its host. Artificial surfaces are widely used to induce appressorium formation, but frequencies of appressorium induction are not always consistent. To understand variable induction of appressorium formation in M. grisea, several factors were tested on GelBond. High levels of appressorium formation were induced over a wide range of temperature (20~3$0^{\circ}C$) and pH (4~7). spore age up to 3-week-old did not significantly affect appressorium formation, but only a few apressoria on GelBond. However, adenosine specifically inhibited appressorium formation. Adenosine inhibition of appressorium formation was restored by exogenous addition of cAMP. Germ tube tips of M. grisea maintained the ability to differentiate appressoria by chemical inducers on GelBond at least up to 16 h after conidia germination. These results suggest that environmental factors have little effect on the variable induction of appressorium formation on the artificial surface in M. grisea.

• 한국식품영양과학회지
• /
• 제23권2호
• /
• pp.244-250
• /
• 1994

Starch phosphates were prepared by dry heating method using sodium triphosphate as a substitution reagent and their physicochemical properties were investigated with the chucheongbyeo and samkangbyeo. The solubility and swelling power of rice starches were increased by phosphorylation reaction. The solubility of the chucheongbyeo was greater than that of samkangbyeo , but the swelling power was appeared in vice versa. The transparency of raw starch was increased at the 6$0^{\circ}C$, but phosphorylated rice starch was begun to increase from 5$0^{\circ}C$. Light transmittance was higher inthe phosphorylate drice starch. The lightness of phosphyorylated rice starch decreased more than that of raw starch. Whereas the yellowness of phosphorylated rice starch increased. The temperature of initial gelatinization of the phosphorylated chucheong and samkang rice starch was shown to 5$0^{\circ}C$ and 53$^{\circ}C$, respectively. lowering 14-15$^{\circ}C$ in temperatureby the phosphorylation . The viscosity as well as by the phosphorylation reaction was raised 7.4-8.4 times, respectively. The hardness, adhesiveness, cohesiveness and texture which is rheological properties of starch gel increased by the phosphoryulation reaction. The chucheong rice starch gel was slightly higher in its rheolgocial values thanthat of the samkang rice starch gel. The rice starch particles were shown to polygonal structure, but they were deformed in the phosphorylated starch.

• Asian-Australasian Journal of Animal Sciences
• /
• 제32권1호
• /
• pp.144-151
• /
• 2019

Objective: Curdlan has been widely used as a gelling agent in various food systems. This study was performed to evaluate the rheological properties of pork myofibrillar protein (MP) with different levels of curdlan (0.5% to 1.5%) and its application to low-fat model sausages (LFS). Methods: MP mixtures were prepared with 0.5%, 1.0%, and 1.5% of curdlan. Cooking loss (%), gel strength (gf), shear stress (Pa), and scanning electron microscopy were measured. Physicochemical and textural properties of LFS containing different levels of curdlan were measured. Results: The shear stress of MP mixtures increased with increasing levels of curdlan. MP gels with increased levels of curdlan decreased cooking loss and increased gel strength (p<0.05). The MPs with 1.0% and 1.5% of curdlan were observed more compact three-dimensional structure than those with 0.5% curdlan. Increased curdlan level in LFS affected redness ($a^{\star}$) and yellowness ($b^{\star}$) values. Although expressible moisture of LFS did not differ among curdlan levels, LFSs with various levels of curdlan decreased cooking loss as compared to control sausages. Hardness values (2,251 to 2,311 gf) of LFS with 0.5% and 1.0% curdlan was increased and differ from those (1,901 gf) of control sausages. Conclusion: The addition of 1.0% curdlan improved the functional and textural properties of LFS.

• 한국치위생학회지
• /
• 제1권2호
• /
• pp.251-260
• /
• 2001

The purpose of this article was to compare the fluoridation effect via individual tray with other professional methods. In oder to compare the fluoridation effect, 40 extracted human teeth was divided into 4 groups(each group was composed of 10 teeth) and the surface hardness of each group was tested in untreated, after fluoridation, after fluoridation and etching by 10% lactic acids. group I: no fluoridation(control) group II : fluoridation with 123%APF group III : fluoridation by iontophoresis with 2% NaF group IV : fluoridation by individual tray with 4% SnF2 gel Surface hardness was measured with Micro hardness tester(Shimadzu Co. Japan), Data analysis was conducted using the repeated measures ANOVA test. The results were as follows: 1. Four tested groups demonstrated nearly the same SMH in extracted state. 2. The SMH after fluoridation showed $330.57{\pm}139.09kg/mm^2$ in group IV, $221.79{\pm}187.48kg/mm^2$ in group II, $186.43{\pm}53.13kg/mm^2$ in group III. So the SMH of group IV, II were was significantly increased(p<0.01). 3. The SMH of group II, III, IV after acid etching was higher than the control group(p<0.01). 4. The SMH between group II, III, and IV after acid etching was not different significantly.