Vol.3 No.2 2010

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Research paper : Products and evaluation device of cosmetics for UV protection (Y. Takao et al.)−141−Synthesiology - English edition Vol.3 No.2 (2010) transmissivity, and (3) high lubriciousness can be achieved at the same time[1][2]. Especially, the only evaluation of lubriciousness for (3) good texture is the qualitative sensitivity test conducted mainly by questionnaire survey, as shown in Fig. 3(a). It is necessary to immediately standardize the evaluation test and device, and then provide a guideline for the powder design that may improve the lubriciousness[2].In this study, we focused on the point that the nanoparticle segregation had never been considered in the design and mixing processes of the current cosmetics, and the most prevalent method was the simple mechanical mixing. As shown in Fig. 4, the composite particle method was created as the core technology by combining the particle packing model (solid phase method), the homogenous dispersion of nanoparticles in aquatic environment (liquid phase method), and the rapid solidification of droplets (gas phase method)[1][2][14]-[21]. The details of the synthetic methodology are discussed in chapter 3.For the lubriciousness evaluation, we looked at the difficulty of stabilizing the sample packing density to the tools and the low reproducibility of the side-grinding force, that is, it was difficult to set the consolidation condition. As the core technology that enables evaluation in a short time and at small amounts, we devised a LS approximation model of the normal force and side-grinding force. As shown in Fig. 5(a), the powder was compacted until the packing density stabilized in the conventional method, and except for certain powder unit operation such as the silo, this evaluation method Fig. 1 Structure of the paper: Technological and social solutions to overcome the “valley of death”(a) Solution for technological elements (logical and strategic scenario for using the powder technology)(b) Solution for social elements (regional collaboration in the style of technical assistance during the Agency period where quick-acting scenario was not set)(b)(a)Trial-and-error learning from natural phenomenaComparisons of “optimization of selection efficiency of feeding route by ants,” ki, entwurf, bricoleur, sen’yo kori, and in’nen shokiUse of external funds and AIST collaboration system for the core technology for ceramic powder unit operationDesign and development“Product realization of UV-protective cosmetics”Case study of “AIST logic + Agency experience” methodologyTotal technological element1. New proposal for lubriciousness assessment2. Achievement of both assessment precision and convenience3. High added value to new material(2) LS approximation model1. New proposal for nanodispersion science2. Achievement of both fine structural control and productivity3. Provision of new material and manufacturing method(1) Composite particle Specific idea for material and methodDemand of new technology to win market competitionDemand of new product in preparation for resource depletionPromote practical applicationManufacturer of powder materialObtain new manufacturing methodManufacturer of final productAISTandtechnological transfer ventureFor strategic logical constructionSocialization methodTechnologyAdjustment of differences in organizational interestsProblems(1) Segregation of nanoparticles(2) Decreased transparency(3) Decreased texture-feelConventional method: Powder mixingCeramicsparticleNanoparticlesNew method: Particle compositingCharacteristics(1) Solution to segregation of nanoparticles(2) Achievement of multiple functions (UV blocking, transparency, texture-feel)(3) Synergy of added value (resource saving = minimization of raw material)Sericite-titaniacomposite particle(and method)(a)(b)Problems(1) Low reproducibility (reliability)(2) Long assessment time(3) Large amount of sample neededCharacteristic(1) Highly reliable quantification(2) Short time, small amount of sampleSimulation ofside-grindingconditionCeramicpowderlayerSkinConventional method: Sensitivity testNew assessment method: LS approximation model(a)(b)Fig. 2 Issues and problems of UV-protective cosmetics (technological point of this study)Fig. 3 Issues and problems in the texture-feel of cosmetics (technological point of this study – part 2)

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